JB/T 8324.2-1996 Technical requirements for simple CNC horizontal lathes
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Simple CNC Horizontal Lathe
Technical Conditions
1 Subject Content and Scope of Application
This standard specifies the requirements for the manufacture and acceptance of simple CNC horizontal lathes. JB/T 8324.2—96
Replaces JB/GQ1126--88
This standard applies to simple CNC horizontal lathes with a maximum rotary diameter of 250 to 1250 mm on the bed and a maximum workpiece length of up to 8000 mm.
Referenced standards
GB 5226
GB 9061
General technical requirements for electrical equipment of machine tools
General technical requirements for metal cutting machine tools
JB4139
Technical requirements for safety protection of metal cutting machine tools and machine tool accessoriesJB/T8324.1Precision of simplified CNC horizontal lathesZB J50 003
Determination of cleanliness of metal cutting machine tools
ZB J50 004
Determination of noise pressure level of metal cutting machine toolsZBnJ50008.1 General technical conditions for machining parts of metal cutting machine toolsZBnJ50008.3 General technical conditions for assembly of metal cutting machine tools3
General requirements
This standard is a concretization and supplement to GB9061, ZBnJ50008.1, ZBnJ50008.3 and other standards. When accepting machine tools according to this standard, the remaining acceptance items in the above standards that are not concretized by this standard must be inspected at the same time. 4 Accessories and tools
4.1 The accessories and tools listed in Table 1 should be supplied randomly. Table 1 Accessories and tools
Three-jaw chuck
Four-jaw chuck
Top sleeve
Special tool holder
Assembly and disassembly adjustment tools
Maximum rotation diameter D on the bed.
4.2 Special accessories that expand the performance of machine tools are supplied according to user requirements and agreements. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996 82
One for each spindle and tailstock
The type and quantity shall be specified by the manufacturer
Implemented on October 1, 1996
5 Safety and Health
JB/T 8324.2—96
5.1 The movement of the slide must be equipped with a limit protection device such as a fixed bumper or limit switch, and it should be able to limit reliably at the maximum allowable feed speed (according to the design regulations) and during rapid movement. 5.2 In order to prevent damage from chips and contamination of coolant, chip screens should be installed at the front and rear of the machine tool. 5.3 The control system should be locked or must be opened with special tools to prevent external accidental actions. 5.4 The operating force of the protective sliding door and handle should not exceed the provisions of Table 2. Table 2 Operating force of sliding door and handle
>320～400
>400～~800
>800～1 250
Protective sliding door
Tailstock sleeve handle
Headstock speed change handle
5.5 The noise of the machine tool shall be inspected according to the provisions of ZBJ50004. There shall be no abnormal screaming and irregular impact sound when the machine tool is running. The noise shall be measured at various speeds without workpieces. The sound pressure level of the whole machine shall not exceed 83dB(A). 5.6 When accepting according to this standard, the remaining acceptance items in JB4139, GB5226 and other standards that are not specified in this standard must be inspected at the same time.
6 Processing and assembly quality
6.1 The bed, saddle and spindle box are important castings and must be aged after rough processing. 6.2 The guide rails of the bed and saddle, and the guide rails of the saddle and cross slide are important guide rails, and wear resistance measures should be taken. 6.3 The following joint surfaces shall be assessed according to the requirements of "important fixed joint surfaces": a.
The joint surface between the bed foot and the bed;
The joint surface between the bed and the bed (joined bed). 6.4 The following joint surfaces shall be assessed according to the requirements of "particularly important fixed joint surfaces": a.
The joint surface between the spindle box and the bed;
The joint surface between the tool disc (tool holder) and the positioning plate, the positioning plate and the tool holder body, and the tool holder body and the slide; the joint surface between the ball screw bracket and the bed, the ball screw bracket and the saddle; the joint surface between the tailstock body and the tailstock bottom plate.
6.5 The following guide surfaces shall be assessed according to the requirements of "sliding guides": the bed and the guide rails of the saddle;
The guide rails of the saddle and cross slide.
6.6 The tailstock and bed guide rail pair shall be assessed according to the requirements of the displacement guide rail. 6.7 The contact length of the cone surface of the locating pin of the locating plate, the locating pin of the spindle box, and the locating pin of the ball screw bracket shall not be less than 60%, and the connection between the two parts shall be in uniform contact.
6.8 The spindle assembly and the pulley shall be subjected to dynamic balancing test and correction, and the balancing quality level shall be specified by the manufacturer. 6.9 The cleanliness of the machine tool shall be inspected according to the provisions of ZBJ50003, and the internal cleanliness of the spindle box and other components shall be inspected by weight method (spot check). Its impurities and dirt shall not exceed the provisions of Table 3.
Spindle box
Hydraulic oil tank
Separation gearbox
Machine tool idling test
JB/T8324.2-96
Table 3 Cleanliness
>360~500
≥500-800
>800～1 250
Operate the machine tool without cutting, and check the stability of the main motion feed motion, the change of machine tool temperature, and the no-load power. 7.1 Temperature rise test
The main transmission mechanism of the machine tool should be operated in sequence from the lowest speed (the stepless speed change mechanism operates at low, medium and high speeds), and the operation time of each speed level shall not be less than 2 minutes. Operate at the highest speed for a sufficient time (not less than 1 hour) to allow the spindle bearing to reach a stable temperature. When the spindle bearing reaches a stable temperature, check the temperature and temperature rise of the spindle bearing, which should not exceed the requirements of Table 4. Table 4 Temperature and temperature rise of spindle bearings
Bearing type
Rolling bearings
Sliding bearings
7.2 Inspection of main motion and feed motion (spot check) Temperature
Main motion mechanism shall be tested for speed conversion at various levels (stepless conversion mechanism shall be tested for low, medium and high speeds). The measured speed shall not exceed 10% of the command value or the value indicated on the plate.
On the entire stroke of the Z and X axes, low, medium and high feed speed conversion tests shall be performed. The measured feed speed shall not exceed 5% of the command value or the value indicated on the plate.
7.3 Action test
7.3.1Perform functional tests on machine tools using buttons, switches or manual operation. Test the flexibility of its actions and the reliability of its functions. a. Choose any spindle speed and conduct continuous operation test of spindle start, forward rotation, reverse rotation and stop (including braking), and the continuous operation shall be no less than 7 times;
Choose any feed speed (or feed amount), and continuously operate the start, feed and stop actions, and conduct working feed and rapid feed test on the full stroke of Z and X coordinate axes. The forward and reverse continuous operation shall be no less than 7 times; c.
Use hand-cranked pulse generator or single-step moving slide and slide plate test, and manually move the tailstock and tailstock sleeve on its full stroke. The tailstock shall be locked at any position of its full stroke; various rotation tests of the tool disc (tool holder); sealing performance test of hydraulic, lubrication and cooling systems, which require easy adjustment, flexible movement, good lubrication, sufficient cooling and no leakage; various indicator lights, reading machines, ventilation systems and other functional tests of digital control devices; functional test of safety, insurance and protective devices of machine tools. Use CNC device control instructions or control belts to conduct functional tests of machine tools to test the flexibility of their movements and the reliability of their functions. The spindle is tested for forward rotation, reverse rotation, stop and spindle speed change (the step-speed mechanism is tested for various speeds, and the stepless mechanism is tested for low, medium and high speeds); the feed mechanism is tested for low, medium and high feed speeds (feeding amount) and rapid feed change; the tool head (tool rest) is tested for various indexing; the feed coordinates are tested for overtravel, manual data input, position display, return to reference point, program number indication and retrieval, program pause, JB/T 8324.2-96 program elimination, and separate component feeding; the reliability and flexibility of functions such as linear interpolation, circular interpolation, linear cutting cycle, taper cutting cycle, thread cutting cycle, circular cutting cycle, tool position compensation, pitch compensation, and gap compensation. 7.4 Idle power test (spot check) The idling power of the main transmission system (excluding the no-load power of the main motor) shall comply with the provisions of the design documents. 7.5 Continuous idle running test of the whole machine
Use the CNC program to simulate the working state under all functions to conduct a continuous idle running test without cutting. No failure should occur during the entire operation process. The continuous idle running time is 16 hours, each cycle time is not more than 15 minutes, and the rest time between each cycle shall not exceed 1 minute. 7.5.1 Use the CNC device to control the spindle speed, and conduct the low, medium and high speed conversion forward, reverse, start and stop tests. 7.5.2 Use the CNC device to control the Z and X coordinate axis feed, and the feed amount is low, medium and high and rapid conversion. The stroke should be full stroke, and the rapid feed stroke should be greater than half of the full stroke. 7.5.3 Use the CNC device to control the tool head (tool holder) to conduct position-by-position conversion and cross-position conversion tests for each station. 8 Load test
The machine tool should be subjected to the following load tests:
Maximum torque test of the main transmission system;
Maximum cutting resistance test;
Main transmission system reaches maximum power test (spot check); c
d. Vibration resistance grooving test.
8.1 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by strong turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (1); when measuring with a power meter (or ammeter and voltmeter) or a tachometer, the torque is calculated according to formula (2), and the main component of the cutting resistance is calculated according to formula (3). The cutting resistance of the machine tool is determined according to the main component and the tool angle.
T = Fr
T ~ 9 550(P- Po)
F~ 9 550(P- Po)
Where: T torque, N ● mi
F main component of the cutting resistance [F in formula (1) is the main component of the cutting resistance measured by the cutting dynamometer], N; P input power of the motor during cutting (referring to the power supplied to the motor by the power grid, kW); P. ... idling power of the machine tool when equipped with a workpiece (referring to the power supplied to the motor by the power grid, kW); r... — cutting radius of the workpiece, m;
n-spindle speed, r/min.
8.1.1 Tool material, type, cutting amount, etc. shall comply with the manufacturer's regulations. 8.1.2 Test piece material and size
Test piece material: 45 steel
Test piece size: Test piece diameter d≤D./2
Test piece length L≤D,
8.2 Maximum power test of main drive system
Use high-speed cutting of external circle to test the machine tool's ability to withstand the rated power of the motor. 8.2.1 Specimen size and tool material and type Material: 45 steel
d=D,/5～D./4
Specimen size: Specimen diameter
·（1）
Specimen length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism in use. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of one test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 893 Use the CNC device to control the tool disc (tool rest) to conduct position-by-position conversion and cross-position conversion tests for each workstation. 8 Load test
The machine tool should undergo the following load tests:
Maximum torque test of the main transmission system;
Maximum cutting resistance test;
Maximum power test of the main transmission system (spot check);c
d. Vibration resistance grooving test.
8.1 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by strong turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (1); when measuring with a power meter (or ammeter and voltmeter) or a tachometer, the torque is calculated according to formula (2), and the main component of the cutting resistance is calculated according to formula (3). The cutting resistance of the machine tool is determined according to the main component and the tool angle.
T = Fr
T ~ 9 550(P- Po)
F~ 9 550(P- Po)
Where: T torque, N·mi
F main component of cutting resistance [F in formula (1) is the main component of cutting resistance measured by cutting dynamometer], N; P input power of motor during cutting (referring to the power supplied to the motor by the power grid, kW); P. ... idling power of machine tool with workpiece (referring to the power supplied to the motor by the power grid, kW); r... — cutting radius of workpiece, m;
n-spindle speed, r/min.
8.1.1 Tool material, type, cutting parameters, etc. shall be as specified by the manufacturer. 8.1.2 Test piece material and dimensions
Test piece material: 45 steel
Test piece dimensions: test piece diameter d≤D./2
Test piece length L≤D,
8.2 Maximum power test of main drive system
Use high-speed cutting of external circle to test the ability of the machine tool to withstand the rated power of the motor. 8.2.1 Specimen size and tool material and type Material: 45 steel
d=D,/5～D./4
Specimen size: Specimen diameter
·（1）
Specimen length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out under the condition of using the compensation mechanism. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle position or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of a test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 893 Use the CNC device to control the tool disc (tool rest) to conduct position-by-position conversion and cross-position conversion tests for each workstation. 8 Load test
The machine tool should undergo the following load tests:
Maximum torque test of the main transmission system;
Maximum cutting resistance test;
Maximum power test of the main transmission system (spot check);c
d. Vibration resistance grooving test.
8.1 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by strong turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (1); when measuring with a power meter (or ammeter and voltmeter) or a tachometer, the torque is calculated according to formula (2), and the main component of the cutting resistance is calculated according to formula (3). The cutting resistance of the machine tool is determined according to the main component and the tool angle.
T = Fr
T ~ 9 550(P- Po)
F~ 9 550(P- Po)
Where: T torque, N·mi
F main component of cutting resistance [F in formula (1) is the main component of cutting resistance measured by cutting dynamometer], N; P input power of motor during cutting (referring to the power supplied to the motor by the power grid, kW); P. ... idling power of machine tool with workpiece (referring to the power supplied to the motor by the power grid, kW); r... — cutting radius of workpiece, m;
n-spindle speed, r/min.
8.1.1 Tool material, type, cutting parameters, etc. shall be as specified by the manufacturer. 8.1.2 Test piece material and dimensions
Test piece material: 45 steel
Test piece dimensions: test piece diameter d≤D./2
Test piece length L≤D,
8.2 Maximum power test of main drive system
Use high-speed cutting of external circle to test the ability of the machine tool to withstand the rated power of the motor. 8.2.1 Specimen size and tool material and type Material: 45 steel
d=D,/5～D./4
Specimen size: Specimen diameter
·（1）
Specimen length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism in use. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of one test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 891 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by strong turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (1); when measuring with a power meter (or ammeter and voltmeter) or a tachometer, the torque is calculated according to formula (2), and the main component of the cutting resistance is calculated according to formula (3). The cutting resistance of the machine tool is determined according to the main component and the tool angle.
T = Fr
T ~ 9 550(P- Po)
F~ 9 550(P- Po)
Where: T torque, N ● mi
F main component of cutting resistance [F in formula (1) is the main component of cutting resistance measured by a cutting dynamometer], N; P input power of the motor during cutting (referring to the power supplied to the motor by the power grid, kW); P. …no-load power of the machine tool when equipped with a workpiece (referring to the power supplied to the motor by the power grid, kW); r…—cutting radius of the workpiece, m;
n-spindle speed, r/min.
8.1.1 Tool material, type, cutting amount, etc. shall be in accordance with the manufacturer's regulations. 8.1.2 Test piece material and size
Test piece material: 45 steel
Test piece size: test piece diameter d≤D./2
Test piece length L≤D,
8.2 Maximum power test of the main transmission system
Use high-speed cutting of the outer circle to test the ability of the machine tool to withstand the rated power of the motor. 8.2.1 Specimen size and tool material and type Material: 45 steel
d=D,/5～D./4
Specimen size: Specimen diameter
·（1）
Specimen length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out under the condition of using the compensation mechanism. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle position or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of a test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 891 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by strong turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (1); when measuring with a power meter (or ammeter and voltmeter) or a tachometer, the torque is calculated according to formula (2), and the main component of the cutting resistance is calculated according to formula (3). The cutting resistance of the machine tool is determined according to the main component and the tool angle.
T = Fr
T ~ 9 550(P- Po)
F~ 9 550(P- Po)
Where: T torque, N ● mi
F main component of cutting resistance [F in formula (1) is the main component of cutting resistance measured by a cutting dynamometer], N; P input power of the motor during cutting (referring to the power supplied to the motor by the power grid, kW); P. …no-load power of the machine tool when equipped with a workpiece (referring to the power supplied to the motor by the power grid, kW); r…—cutting radius of the workpiece, m;
n-spindle speed, r/min.
8.1.1 Tool material, type, cutting amount, etc. shall be in accordance with the manufacturer's regulations. 8.1.2 Test piece material and size
Test piece material: 45 steel
Test piece size: test piece diameter d≤D./2
Test piece length L≤D,
8.2 Maximum power test of the main transmission system
Use high-speed cutting of the outer circle to test the ability of the machine tool to withstand the rated power of the motor. 8.2.1 Specimen size and tool material and type Material: 45 steel
d=D,/5～D./4
Specimen size: Specimen diameter
·（1）
Specimen length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out under the condition of using the compensation mechanism. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle position or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of a test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 89/4
Test piece dimensions: Test piece diameter
·（1）
Test piece length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min wwW.bzxz.Net
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out under the condition of using the compensation mechanism. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle position or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of a test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 89/4
Test piece dimensions: Test piece diameter
·（1）
Test piece length L=500mm
Tool: YT15,=6°,α=6°,=75°; Tool nose radius: r=1.2mm
8.2.2 Cutting parameters
Cutting speed: u100～120m/min
Feed rate: S~D,/1000
Cutting depth: t
JB/T8324.2-96
Change the cutting depth to make the motor reach the rated power. 8.3 Vibration resistance grooving test
During the grooving test, there should be no obvious vibration. 8.3.1 Test piece material and dimensions
Test piece material: 45 steel
Test piece diameter: D.<800 mm, d=D,/5
D.≥800 mm, d=D./7 (but d is not less than 130 mm) Distance from cutting position to chuck end face: L=1.5d8.3.2 Test parameters
Cutting speed: D.≤400 mm, u=80±20 m/minD.400 mm, v=100±20 m/min
Feed rate: D,<800 mm, S=0.1 mm/r
D,≥800 mm, S=0.2 mm/r
8.3.3 Tool
Tool material: YT15
Tool angle: -8°~10°, α=3°～5°Tool installation height: should not be higher than the spindle axis by 0.5mmCutter width b is selected according to Table 5.
Table 5 Cutter width
>320～500
>500800
>800-1250
Machine tool accuracy inspection
Accuracy inspection shall be carried out in accordance with JB/T8324.1.
Seven items of G7, G11, G13, P1, P2, P3, P4 in the accuracy standard shall be inspected when the machine tool reaches a stable temperature at medium speed. 9.2
9.3Working accuracy inspection shall be carried out in accordance with the cutting specifications specified in the design documents. 9.41
Working accuracy inspection, P4 cutting comprehensive test piece, its surface roughness R. shall not be greater than 1.6μm. 9.5 The axial play of the ball screw shall not be greater than 0.007mm9.6 Reverse deviation test
Inspect the reverse deviation of the machine tool before gap compensation. The inspection method and inspection tools shall be in accordance with the inspection of G19 position accuracy in JB/T8324.1. The tolerance shall be assessed in accordance with Table 6.
Maximum workpiece length
9.7 Return to reference point test
The return to reference point test shall be carried out in accordance with Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Return to reference point test
Test method
Make the knob plate (or slide plate) quickly feed back to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and perform at least 7 return to reference point tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out in accordance with Table 8. Table 8 Minimum setting unit feeding test
Test diagram
Test method
After the tumor plate (Z axis) is quickly fed to the positive
direction to the detection position, several setting unit instructions are given in the same direction. Taking the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the inspection, several setting units are excluded from measurement to eliminate the influence of reverse error. As shown in Figure 1.
X and Z axes need to be inspected.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out under the condition of using the compensation mechanism. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle position or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of a test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (that is, the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 897 Reference point return test
Return reference point test is carried out according to Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Reference point return test
Test method
Make the knob plate (or slide plate) return to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and carry out at least 7 reference point return tests.
Calculate the reference point errors of the Z and X axes separately.
The error is calculated by the maximum difference measured
9.7.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism used. 9.7.2 When measuring a coordinate, other moving parts should be placed in the middle position or stable position of their stroke. 9.8 Minimum setting unit feed test
The minimum setting unit feed test is carried out according to Table 8. Table 8 Minimum setting unit feed test
Test diagram
Test method
After the knob plate (Z axis) is first quickly fed in the positive
direction to the detection position, several setting unit instructions are given in the same direction. With the stop position as the reference, a single minimum setting unit instruction is continuously given in the same direction to make the movement equivalent to a distance of more than 20 units. The stop position of each unit instruction is measured, and then 20 minimum setting unit instructions are given in the negative direction from the above-mentioned final position. Return to the reference position and measure the stop position of each instruction. At least three positions in the middle of the stroke and near both ends are measured. When returning to the test, several setting units are excluded from the test to eliminate the influence of the reverse error. As shown in Figure 1.
Both the X and Z axes need to be tested.
Inspection tool
Laser interferometer or finger
Base push position
JB/T 8324.2--96
Number of finger units
Number of set units removed when returning
Moving distance not measured
9.8.1 For machine tools equipped with compensation mechanisms, the test can be carried out with the compensation mechanism in use. 9.8.2 When testing one coordinate, other moving parts should be placed in the middle or stable position of their travel. 9.9 Dispersion of diameter size of precision turning test piece A9.9.1 Test conditions
After the machine tool spindle runs at medium speed to a stable temperature, start turning the test piece. Before the turning tool completes the outer circle turning of 5 test pieces in one installation, the tool holder should be rotated 360° after each turning of one test piece. 9.9.2 Test piece and cutting conditions
Test piece and cutting conditions shall be in accordance with the requirements of Table 9,
Table 9 Test piece and cutting conditions
Simplified diagram and test piece size
D= 0, 1D.
D, (0. 08~0. 1) D,
Test piece material is steel
Cutting conditions
Cutting depth
Feed rate
9.9.3 Calculation of dispersion error
JB/T 8324.2-96
Measure the maximum variation W of the diameter size of the five test pieces (i.e. the dispersion A of the extreme diameter size of the five test pieces). Use 6 times the standard deviation for assessment.
A. - 2.58W
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Lathe Research Institute. This standard is drafted by Shenyang Lathe Research Institute. 897 Reference point return test
Return reference point test is carried out according to Table 7.
Test diagram
JB/T 8324.2—96
Reverse deviation
Table 7 Reference point return test
Test method
Make the knob plate (or slide plate) return to the reference point from any point on the full stroke of the Z axis (or X axis). Measure its actual position and carry out at least 7 reference point return tests.
Calculate the reference point errors of the Z and X axes separatel
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