JB/T 8326.2-1996 Technical requirements for CNC instrument horizontal lathes
Some standard content:
Mechanical Industry Standard of the People's Republic of China
CNC Instrument Horizontal Lathe
Technical Conditions
Subject Content and Scope of Application
This standard specifies the requirements for the manufacture and acceptance of CNC instrument horizontal lathes. JB/T 8326.2--96
This standard applies to ordinary precision CNC instrument horizontal lathes and their variants with a maximum rotary diameter of 250mm on the bed and a maximum workpiece length of 500mm.
Referenced standards
General technical conditions for electrical equipment of machine tools
GB5226
GB9061
GB 10931
General technical conditions for metal cutting machine tools
Evaluation method for position accuracy of digitally controlled machine toolsJB4139
Technical conditions for safety protection of metal cutting machine tools and machine tool accessoriesJB/T 8326.1
ZB J50 003
ZB J50 004
Precision of numerically controlled horizontal lathes
Determination of cleanliness of metal cutting machine tools
Determination of sound pressure level of noise of metal cutting machine toolsZBnJ50 008.1
General technical conditions for machining parts of metal cutting machine toolsZBn J50 008.3
General Technical Conditions for Assembly of Metal Cutting Machine Tools ZBJ50016 General Technical Conditions for Hydraulic Systems of Metal Cutting Machine Tools 3 General Requirements
This standard specifies and supplements GB9061, ZBnJ50008.1, ZBnJ50008.3, etc. When accepting machine tools according to this standard, the remaining acceptance items in the above standards that are not specified in 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
Spring Collet (or Chuck)
Shim (or Adjusting Screw)
4.2 Special accessories can be supplied according to agreement.
5 Safety and Health
Clamping Parts
Adjusting Machine Tools
Clamping Tool Holder
5.1 The guide rail surface and ball screw of the bed should be equipped with protective devices; the working area should be equipped with protective covers. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996 126
Implemented on October 1, 1996
JB/T 8326.2--96
5.2 The longitudinal movement of the slide and the lateral movement of the slide should have safety devices at the extreme positions. 5.3 Inspect the noise of the machine tool in accordance with the provisions of ZBJ50004. The noise measurement of the machine tool should be carried out under the condition of idling at various speeds. The sound pressure level of the whole machine noise shall not exceed 83dB(A).
5.4 The operating force of the tailstock handwheel shall not exceed 30N. 5.5 When accepting machine tools according to this standard, the remaining acceptance items in JB4139 that are not specified in this standard must be inspected at the same time. And the acceptance items specified in GB5226 and ZBJ50016 must be inspected. 6 Processing and assembly quality
6.1 The bed, spindle box, slide, and tailstock body are important castings and must be aged after rough processing. 6.2 For the main parts that are easy to wear, such as the spindle, tailstock sleeve and main transmission gear, wear-resistant measures corresponding to the service life must be taken. 6.3 The bed guide pair and the cross slide guide pair are important guide pairs. Wear-resistant cast iron, plastic-coated guides or high (medium) frequency induction quenching and other wear-resistant measures should be used.
6.4 The joint surface between the base and the bed should be assessed according to the requirements of "important fixed joint surface". 6.5 The following joint surfaces should be assessed according to the requirements of "particularly important fixed joint surfaces": slide.
The joint surface between the main spindle box and the bed;
The joint surface between the tool holder body and the slide plate;
The joint surface between the tailstock body and the tailstock base plate;
The joint surface between the ball screw bracket and the bed.
6.6 The following guide pairs shall be assessed according to the requirements of "sliding guides": slide plate and bed guide pair;
b. Slide plate and slide plate guide pair.
6.7 The tailstock base plate (or tailstock body) and the bed guide pair shall be assessed according to the requirements of "displacement guide". 6.8 The cleanliness shall be inspected according to the provisions of ZBJ50003, and the internal cleanliness of the closed spindle box components shall be inspected by weight. Its impurities and dirt shall not exceed 10,000 mg (spot check).
6.9 The spindle components shall be dynamically balanced, and their residual unbalance shall comply with the provisions of the design documents. 7 Operation test
The operation test includes functional test, idle operation test and continuous idle operation test. 7.1 Functional test
7.1.1 General functional test
Perform functional test on the machine tool by using buttons, switches or manual operation to test its flexibility, stability and functional reliability. 7.1.1.1 The spindle is tested for low, medium and high speed conversion. The tolerance between the command value and the displayed value (or measured value) of the speed is ±5%. 7.1.1.2 The hydraulic, lubrication and cooling systems are tested for sealing, lubrication and cooling performance. The requirements are easy adjustment, flexible movement, good lubrication and sufficient cooling. Each system must not leak.
7.1.1.3 Select any spindle speed to start the spindle for forward, reverse and stop continuous test. The continuous operation shall be no less than seven times. 7.1.1.4 Select any feed amount to start the feed and stop action for continuous operation. Perform working feed and rapid feed tests on the entire stroke of the Z axis and X axis, and the rapid stroke is greater than 1/2 of the entire stroke. Perform forward and reverse continuous operations for no less than seven times. 7.1.1.5 Perform low, medium and high feed rate conversion tests on the entire stroke of the B axis and X axis. 7.1.1.6
Use a hand-cranked pulse generator or single-step movement of the knob plate and the slide plate for testing. 7.1.1.7 Perform a movement test of the tailstock and tailstock sleeve on their entire stroke by manual or motorized operation. 7.1.1.8 Perform a locking test on the moving parts with locking mechanisms at any position of their entire stroke. The slide plates of the inclined and vertical guide rails should not fall after the power is cut off.
7.1.1.9 Perform various indexing and clamping tests on the turret tool holder. 127
7.1.1.10 Perform an operation test on the chip conveyor device. JB/T8326.2—96
7.1.1.11 Various indicator lights, photoelectric readers, ventilation systems, etc. of digital control devices shall be tested for functions. 7.1.1.12 For machine tools with automatic clamping and tool changing mechanisms, automatic clamping and tool changing tests shall be conducted. 7.1.1.13 The clamping and loosening of the spring collet (or chuck) shall be tested for flexibility and reliability. 7.1.1.14 The safety, insurance and protection devices of the machine tool shall be tested for functions. 7.1.2 CNC (or NC) control function test The machine tool shall be tested for functions using CNC (or NC) control instructions. The flexibility of its movements and the reliability of its functions shall be tested. 7.1.2.1 The spindle shall be tested for forward rotation, reverse rotation, stop and spindle speed change (the stepless speed change mechanism shall be tested for low, medium and high speed). 7.1.2.2 The feed mechanism shall be tested for low, medium and high feed amounts and rapid feed change. 7.1.2.3 The turret force frame is used to conduct various indexing and clamping tests. 7.1.2.4 Test the reliability and flexibility of the functions such as overtravel of feed coordinates, manual data input, position display, return to reference point program, serial number indication and retrieval, program pause, program elimination, linear interpolation, circular interpolation, linear cutting cycle, taper cutting cycle, thread cutting cycle, circular cutting cycle, tool position compensation, pitch compensation, and clearance compensation. 7.2 Idle operation test
7.2.1 Idle operation test of main motion mechanism
In the non-cutting operation state, test the temperature change and no-load power of the spindle during operation. The recording format is as shown in Table 2. Table 2
Spindle speed r/min
Measurement time
Specified value
Actual value
Temperature ℃
Spindle bearing
No-load power
Input power
The main motion mechanism of the machine tool starts from low speed and runs at three speeds of low, medium and high (the step-speed change is all speeds, and the running time of each level is not less than 2min). It should run for a sufficient time at the highest speed (not less than 1h). Make the spindle bearing reach a stable temperature, measure the bearing temperature and temperature rise near the contact point between the top of the spindle bearing cover and the box, and the value shall not exceed the provisions of Table 3. Table 3
Bearing type
Sliding bearing
Rolling bearing
Hydrostatic bearing
The no-load power of the main rotating system (excluding the no-load power of the main motor) shall not exceed 40% of the rated power of the main motor. 7.2.2 Motion test of feed system
Select an appropriate spindle speed and use low, medium, high and fast feed to test the feed mechanism's B-axis and X-axis idle motion feed amount. The record format is as shown in Table 4.
Feed amount
7.3 Continuous idle running test
Test items
JB/T8326.296
Command value
mm/r or mm/min
Measured value
mm/r or mm/min
Use CNC program to perform non-cutting continuous motion rotation test under all functions. The operation time shall not be less than 16 hours, and each cycle time shall not be more than 15 minutes. At the end of each cycle, the machine shall stop to simulate the action of loosening the workpiece. The machine shall stop for no more than 1 minute before continuing to operate. 7.3.1 The spindle is equipped with a spring chuck (or chuck). The spindle shall be tested for continuous conversion of low, medium and high speed, operation, forward, reverse, start and stop of the end face at a constant speed. The high-speed operation time shall exceed 1/3 of the cycle time. 7.3.2 Low, medium and high feed amount and rapid feed conversion of the Z axis and X axis. The feed stroke shall be the full stroke. The rapid feed stroke shall be greater than half of the full stroke.
7.3.3 The turret is equipped with necessary accessories and arranged to be slightly overweight. All workstations of the turret tool post are converted position by position and over-position. 8 Load test
For CNC instrument horizontal lathes with a maximum rotation diameter of 200mm to 250mm on the bed, the main transmission system should be tested to reach the maximum power. Other CNC lathes should be tested for maximum processing capacity. The test specifications shall be in accordance with the design requirements. The ability of the machine tool to withstand the design power is tested by cutting the outer circle, and the record format is in accordance with Table 5. Table 5
Test piece clamping method: top turning
Test piece material: 45 steel (quenched and tempered)
Test piece diameter: d≥D./10
Test piece length: 1≥D./2
Blade material: cemented carbide
Cutting amount: specified by the manufacturer
Note: D. is the maximum rotation diameter on the bed. Conditions
Feed
Idle running
Input power
Reverse difference test of linear motion axis
The test is carried out as specified in Table 6.
Test diagram
JB/T8326.2--96
Test method
Test tool
The moving part on the non-detection axis is placed in the middle of its stroke.
Fix the laser interferometer on the fixed part of the machine tool. Make its light parallel to the moving direction of the moving part. Fix the reflector on the moving part. Move the moving part quickly from the fixed reference point to approach each target position (not less than five) from the positive and negative directions (the symbol + indicates positive approach, and the symbol indicates negative approach), and perform five positionings for each, and measure the position deviation of the moving part at each positive and negative positioning, that is, the difference between the actual position and the target position.
According to the method specified in GB10931, calculate the average position deviation (X,,,) during positive and negative positioning. The error is calculated as the maximum absolute value in (x, -x, ★). That is,
B=IB,Izuax
Both the X-axis and Z-axis should be tested
This test can be carried out during the precision inspection of the CNC instrument horizontal lathe. 130
Indicator
Step gauge
(or gauge block)
10Minimum setting unit feed test
JB/T8326.2--96
The minimum setting unit feed test is carried out according to Table 7. Test the reliability and accuracy of each unit action. Table 7
Test diagram
Test method
The moving parts on the non-detection axis are placed in the middle position of their stroke.
Fix the laser interferometer on the fixed part of the machine tool so that its light is parallel to the moving direction of the moving part. Fix the reflector on the moving part. The moving part moves quickly to the test position. Give several minimum setting unit instructions in the same direction, take the stop position as the reference position, and then give a single minimum setting unit instruction in the same direction continuously, so that it moves a distance equivalent to more than 20 instructions, take the 20th instruction position as the final position, and measure the stop position of each instruction between the reference position and the final position. Then move several minimum setting unit instructions in the opposite direction without measuring to eliminate the influence of the reverse error. Starting from the final position, give 20 single minimum setting unit instructions in succession, return to the reference position, and measure the stop position of each instruction (see Figure 1).
Test at least in the middle position of the stroke and three positions near both ends.
The error is measured as the ratio of the absolute value of the difference between the actual total displacement of 20 minimum setting unit instructions and the input value to the input value.
X-axis and Z-axis should be inspected
Number of command units
Reference position
Inspection tool
Laser interferometer
Indicator
Step gauge
(or gauge block)
Remove the moving distance not measured by the excited setting
unit when returning
JB/T 8326.2—96
Error value-
Where: l--distance between adjacent stop positions, mm; m--
value of the minimum setting unit, mm.
Return to reference point test
Return to reference point test shall be carried out according to Table 8.
Test diagram
it:-20ml
Test method
The moving part returns quickly to the base push point from any position on its travel, and measures its actual stop position. Perform at least seven return
to the base point test.
The error is calculated as the maximum difference of the measurement results. Both the X-axis and the Z-axis should be inspected
Applicable to CNC machine tools with fixed reference points, and the actual size of the reference points needs to be detected. 12 Force tool incremental cutting test
Inspection tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
Use the tool increment function to input AX (diameter value) and △Z increments for the X-axis and Z-axis, perform five cuttings, and measure the length dimensions of each time. The recording format is as shown in Tables 9 and 10.
Test piece material: 45 steel
Test piece size: see Figure 2
Cutting speed: V=100~150m/min
Feed rate: S=0.1mm/r
Cutting depth: AX-0.3mm (diameter)
AZ=0.1 mm
Blade material: cemented carbide
Cutting number
Tolerance between diameters
Cutting number
Tolerance between lengths
JB/T 8326.2—96
L3=-19
Measured length
t+'aaa
D,, Dz, D3, D, measured value
and theoretical value tolerance
Tolerance
Measured value and theoretical value tolerance
Machine tool accuracy inspection
13.1Accuracy inspection shall be carried out in accordance with JB/T8326.1. JB/T8326.2—96
13.2G7, G11 and G13 in JB/T8326.1 shall be inspected when the machine tool reaches the medium speed stable temperature. 13.3When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the outer circle of the test piece is 1.25μm. The tool and cutting amount are specified by the design.
Additional Notes:
This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. This standard was drafted by Shanghai Instrument and Machine Tool Factory. 134/2
Blade material: carbide
Cutting parameters: specified by the manufacturer
Note: D. is the maximum rotation diameter on the bed. Conditions
Feed
Idle running
Input power
Reverse difference test of linear motion axis
The test is carried out in accordance with the provisions of Table 6.
Test diagram
JB/T8326.2--96
Test method
Inspection tool
The moving part on the non-detection axis is placed in the middle of its stroke.
Fix the laser interferometer on the fixed part of the machine tool. Make its light parallel to the moving direction of the moving part. Fix the reflector on the moving part. Move the moving parts quickly from the fixed reference point to approach each target position (no less than five) from the positive and negative directions (the symbol + indicates positive approach, and the symbol indicates negative approach), and perform five positionings for each, and measure the position deviation of the moving parts at each positive and negative positioning, that is, the difference between the actual position and the target position.
According to the method specified in GB10931, calculate the average position deviation (X,,,) during positive and negative positioning. The error is calculated as the maximum absolute value in (x, -x, ★). That is,
B=IB,Izuax
Both the X-axis and Z-axis should be tested
This test can be carried out during the precision inspection of CNC instrument horizontal lathes. 130
Indicator
Step gauge
(or gauge block)
10Minimum setting unit feed test
JB/T8326.2--96
Minimum setting unit feed test is carried out according to Table 7. Test the reliability and accuracy of each unit action. Table 7Www.bzxZ.net
Test diagram
Test method
The moving part on the non-detection axis is placed in the middle position of its stroke.
Fix the laser to the interferometer on the fixed part of the machine tool so that its light is parallel to the moving direction of the moving part. Fix the reflector on the moving part. The moving part moves quickly to the test position. Give several minimum setting unit instructions in the same direction, take the stop position as the reference position, and then give a single minimum setting unit instruction in the same direction continuously, so that it moves a distance equivalent to more than 20 instructions, take the 20th instruction position as the final position, and measure the stop position of each instruction between the reference position and the final position. Then move in the opposite direction for several minimum setting unit instructions without measuring to eliminate the influence of reverse error. Starting from the final position, give 20 single minimum setting unit instructions in succession, return to the reference position, and measure the stop position of each instruction (see Figure 1).
Test at least in the middle position of the stroke and three positions near both ends.
The error is measured as the ratio of the absolute value of the difference between the actual total displacement of 20 minimum setting unit instructions and the input value to the input value.
X-axis and Z-axis should be inspected
Number of command units
Reference position
Inspection tool
Laser interferometer
Indicator
Step gauge
(or gauge block)
Remove the moving distance not measured by the excited setting
unit when returning
JB/T 8326.2—96
Error value-
Where: l--distance between adjacent stop positions, mm; m--
value of the minimum setting unit, mm.
Return to reference point test
Return to reference point test shall be carried out according to Table 8.
Test diagram
it:-20ml
Test method
The moving part returns quickly to the base push point from any position on its travel, and measures its actual stop position. Perform at least seven return
to the base point test.
The error is calculated as the maximum difference of the measurement results. Both the X-axis and the Z-axis should be inspected
Applicable to CNC machine tools with fixed reference points, and the actual size of the reference points must be detected. 12 Force tool incremental cutting test
Inspection tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
Use the tool increment function to input AX (diameter value) and △Z increments for the X-axis and Z-axis, perform five cuttings, and measure the length dimensions of each time. The recording format is as shown in Tables 9 and 10.
Test piece material: 45 steel
Test piece size: see Figure 2
Cutting speed: V=100~150m/min
Feed rate: S=0.1mm/r
Cutting depth: AX-0.3mm (diameter)
AZ=0.1 mm
Blade material: cemented carbide
Cutting number
Tolerance between diameters
Cutting number
Tolerance between lengths
JB/T 8326.2—96
L3=-19
Measured length
t+'aaa
D,, Dz, D3, D, measured value
and theoretical value tolerance
Tolerance
Measured value and theoretical value tolerance
Machine tool accuracy inspection
13.1Accuracy inspection shall be carried out in accordance with JB/T8326.1. JB/T8326.2—96
13.2G7, G11 and G13 in JB/T8326.1 shall be inspected when the machine tool reaches the medium speed stable temperature. 13.3When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the outer circle of the test piece is 1.25μm. The tool and cutting amount are specified by the design.
Additional Notes:
This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. This standard was drafted by Shanghai Instrument and Machine Tool Factory. 134/2
Blade material: carbide
Cutting parameters: specified by the manufacturer
Note: D. is the maximum rotation diameter on the bed. Conditions
Feed
Idle running
Input power
Reverse difference test of linear motion axis
The test is carried out in accordance with the provisions of Table 6.
Test diagram
JB/T8326.2--96
Test method
Inspection tool
The moving part on the non-detection axis is placed in the middle of its stroke.
Fix the laser interferometer on the fixed part of the machine tool. Make its light parallel to the moving direction of the moving part. Fix the reflector on the moving part. Move the moving parts quickly from the fixed reference point to approach each target position (no less than five) from the positive and negative directions (the symbol + indicates positive approach, and the symbol indicates negative approach), and perform five positionings for each, and measure the position deviation of the moving parts at each positive and negative positioning, that is, the difference between the actual position and the target position.
According to the method specified in GB10931, calculate the average position deviation (X,,,) during positive and negative positioning. The error is calculated as the maximum absolute value in (x, -x, ★). That is,
B=IB,Izuax
Both the X-axis and Z-axis should be tested
This test can be carried out during the precision inspection of CNC instrument horizontal lathes. 130
Indicator
Step gauge
(or gauge block)
10Minimum setting unit feed test
JB/T8326.2--96
Minimum setting unit feed test is carried out according to Table 7. Test the reliability and accuracy of each unit action. Table 7
Test diagram
Test method
The moving part on the non-detection axis is placed in the middle position of its stroke.
Fix the laser to the interferometer on the fixed part of the machine tool so that its light is parallel to the moving direction of the moving part. Fix the reflector on the moving part. The moving part moves quickly to the test position. Give several minimum setting unit instructions in the same direction, take the stop position as the reference position, and then give a single minimum setting unit instruction in the same direction continuously, so that it moves a distance equivalent to more than 20 instructions, take the 20th instruction position as the final position, and measure the stop position of each instruction between the reference position and the final position. Then move in the opposite direction for several minimum setting unit instructions without measuring to eliminate the influence of reverse error. Starting from the final position, give 20 single minimum setting unit instructions in succession, return to the reference position, and measure the stop position of each instruction (see Figure 1).
Test at least in the middle position of the stroke and three positions near both ends.
The error is measured as the ratio of the absolute value of the difference between the actual total displacement of 20 minimum setting unit instructions and the input value to the input value.
X-axis and Z-axis should be inspected
Number of command units
Reference position
Inspection tool
Laser interferometer
Indicator
Step gauge
(or gauge block)
Remove the moving distance not measured by the excited setting
unit when returning
JB/T 8326.2—96
Error value-
Where: l--distance between adjacent stop positions, mm; m--
value of the minimum setting unit, mm.
Return to reference point test
Return to reference point test shall be carried out according to Table 8.
Test diagram
it:-20ml
Test method
The moving part returns quickly to the base push point from any position on its travel, and measures its actual stop position. Perform at least seven return
to the base point test.
The error is calculated as the maximum difference of the measurement results. Both the X-axis and the Z-axis should be inspected
Applicable to CNC machine tools with fixed reference points, and the actual size of the reference points must be detected. 12 Force tool incremental cutting test
Inspection tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
Use the tool increment function to input AX (diameter value) and △Z increments for the X-axis and Z-axis, perform five cuttings, and measure the length dimensions of each time. The recording format is as shown in Tables 9 and 10.
Test piece material: 45 steel
Test piece size: see Figure 2
Cutting speed: V=100~150m/min
Feed rate: S=0.1mm/r
Cutting depth: AX-0.3mm (diameter)
AZ=0.1 mm
Blade material: cemented carbide
Cutting number
Tolerance between diameters
Cutting number
Tolerance between lengths
JB/T 8326.2—96
L3=-19
Measured length
t+'aaa
D,, Dz, D3, D, measured value
and theoretical value tolerance
Tolerance
Measured value and theoretical value tolerance
Machine tool accuracy inspection
13.1Accuracy inspection shall be carried out in accordance with JB/T8326.1. JB/T8326.2—96
13.2G7, G11 and G13 in JB/T8326.1 shall be inspected when the machine tool reaches the medium speed stable temperature. 13.3When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the outer circle of the test piece is 1.25μm. The tool and cutting amount are specified by the design.
Additional Notes:
This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. This standard was drafted by Shanghai Instrument and Machine Tool Factory. 1342--96
The minimum setting unit feed test is carried out according to Table 7. The reliability and accuracy of each unit action are tested. Table 7
Test diagram
Test method
The moving part on the non-detection axis is placed in the middle position of its stroke.
Fix the laser to the interferometer on the fixed part of the machine tool so that its light is parallel to the movement direction of the moving part. Fix the reflector on the moving part. The moving part moves quickly to the test position. Give several minimum setting unit instructions in the same direction, take the stop position as the reference position, and then give a single minimum setting unit instruction in the same direction continuously, so that it moves a distance equivalent to more than 20 instructions, take the 20th instruction position as the final position, and measure the stop position of each instruction between the reference position and the final position. Then move several minimum setting unit instructions in the opposite direction without measuring to eliminate the influence of reverse error. Starting from the final position, give 20 single minimum setting unit instructions in succession, return to the reference position, and measure the stop position of each instruction (see Figure 1).
Test at least in the middle of the stroke and three positions near both ends.
The error is calculated as the ratio of the absolute value of the difference between the actual total displacement of 20 minimum setting unit instructions and the input value to the input value.
Both the X-axis and Z-axis should be tested
Number of instruction units
Reference position
Testing tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
When returning, remove the moving distance that is not measured for each setting
unit
JB/T 8326.2—96
Error value-
Where: l--the distance between adjacent stop positions, mm; m--the value of the minimum setting unit, mm.
Return to reference point test
Return to reference point test is carried out according to Table 8.
Test diagram
it:-20ml
Test method
The moving part returns to the reference point quickly from any position on its travel, and its actual stop position is measured. At least seven return to reference point tests are carried out.
The error is calculated by the maximum difference of the measurement results. Both X-axis and Z-axis should be inspected
Applicable to CNC machine tools with fixed reference points, and the actual size of the reference points needs to be detected. 12 Tool incremental cutting test
Inspection tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
Use the tool increment function to input AX (diameter value) and △Z increments for each X-axis and Z-axis, perform five cuttings, and measure the length dimensions of each time. The recording format is in accordance with Table 9 and Table 10.
Test piece material: 45 steel
Test piece size: see Figure 2
Cutting speed: V=100~150m/min
Feed rate: S=0.1mm/r
Cutting depth: AX-0.3mm (diameter)
AZ=0.1 mm
Blade material: cemented carbide
Cutting number
Tolerance between diameters
Cutting number
Tolerance between lengths
JB/T 8326.2—96
L3=-19
Measured length
t+'aaa
D,, Dz, D3, D, measured value
and theoretical value tolerance
Tolerance
Measured value and theoretical value tolerance
Machine tool accuracy inspection
13.1Accuracy inspection shall be carried out in accordance with JB/T8326.1. JB/T8326.2—96
13.2G7, G11 and G13 in JB/T8326.1 shall be inspected when the machine tool reaches the medium speed stable temperature. 13.3When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the outer circle of the test piece is 1.25μm. The tool and cutting amount are specified by the design.
Additional Notes:
This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. This standard was drafted by Shanghai Instrument and Machine Tool Factory. 1342--96
The minimum setting unit feed test is carried out according to Table 7. The reliability and accuracy of each unit action are tested. Table 7
Test diagram
Test method
The moving part on the non-detection axis is placed in the middle position of its stroke.
Fix the laser to the interferometer on the fixed part of the machine tool so that its light is parallel to the movement direction of the moving part. Fix the reflector on the moving part. The moving part moves quickly to the test position. Give several minimum setting unit instructions in the same direction, take the stop position as the reference position, and then give a single minimum setting unit instruction in the same direction continuously, so that it moves a distance equivalent to more than 20 instructions, take the 20th instruction position as the final position, and measure the stop position of each instruction between the reference position and the final position. Then move several minimum setting unit instructions in the opposite direction without measuring to eliminate the influence of reverse error. Starting from the final position, give 20 single minimum setting unit instructions in succession, return to the reference position, and measure the stop position of each instruction (see Figure 1).
Test at least in the middle of the stroke and three positions near both ends.
The error is calculated as the ratio of the absolute value of the difference between the actual total displacement of 20 minimum setting unit instructions and the input value to the input value.
Both the X-axis and Z-axis should be tested
Number of instruction units
Reference position
Testing tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
When returning, remove the moving distance that is not measured for each setting
unit
JB/T 8326.2—96
Error value-
Where: l--the distance between adjacent stop positions, mm; m--the value of the minimum setting unit, mm.
Return to reference point test
Return to reference point test is carried out according to Table 8.
Test diagram
it:-20ml
Test method
The moving part returns to the reference point quickly from any position on its travel, and its actual stop position is measured. At least seven return to reference point tests are carried out.
The error is calculated by the maximum difference of the measurement results. Both X-axis and Z-axis should be inspected
Applicable to CNC machine tools with fixed reference points, and the actual size of the reference points needs to be detected. 12 Tool incremental cutting test
Inspection tools
Laser interferometer
Indicator
Step gauge
(or gauge block)
Use the tool increment function to input AX (diameter value) and △Z increments for each X-axis and Z-axis, perform five cuttings, and measure the length dimensions of each time. The recording format is in accordance with Table 9 and Table 10.
Test piece material: 45 steel
Test piece size: see Figure 2
Cutting speed: V=100~150m/min
Feed rate: S=0.1mm/r
Cutting depth: AX-0.3mm (diameter)
AZ=0.1 mm
Blade material: cemented carbide
Cutting number
Tolerance between diameters
Cutting number
Tolerance between lengths
JB/T 8326.2—96
L3=-19
Measured length
t+'aaa
D,, Dz, D3, D, measured value
and theoretical value tolerance
Tolerance
Measured value and theoretical value tolerance
Machine tool accuracy inspection
13.1Accuracy inspection shall be carried out in accordance with JB/T8326.1. JB/T8326.2—96
13.2G7, G11 and G13 in JB/T8326.1 shall be inspected when the machine tool reaches the medium speed stable temperature. 13.3When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the outer circle of the test piece is 1.25μm. The tool and cutting amount are specified by the design.
Additional Notes:
This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. This standard was drafted by Shanghai Instrument and Machine Tool Factory. 134
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