JB/T 8486.2-1996 Technical requirements for CNC universal tool milling machines
Some standard content:
JB/T8486.2-96
Based on the structural characteristics and use requirements of CNC universal tool milling machines, this standard specifies and supplements the general technical standards of machine tools such as GB9061-88 "General Technical Conditions for Metal Cutting Machine Tools", ZBnJ50008.1-88 "General Technical Conditions for Mechanical Processing Parts of Metal Cutting Machine Tools" and ZBnJ50008.3-88 "General Technical Conditions for Assembly of Metal Cutting Machine Tools". This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Beijing Milling Machine Research Institute. The drafting units of this standard are: Kunming Milling Machine Factory, Qinghai No. 1 Machine Tool Factory, Beijing Instrument Machine Tool Factory, Wuhan No. 4 Machine Tool Factory, Tianjin No. 6 Machine Tool Factory, Beijing Milling Machine Research Institute, Nantong Machine Tool Co., Ltd. and South Anhui Machine Tool Factory. 374
1 Scope
Machinery Industry Standard of the People's Republic of China
CNC Universal Tool Milling Machine
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC universal tool milling machines. JB/T 8486.2—96
This standard applies to general-purpose CNC universal tool milling machines with a horizontal (universal) worktable width of 200 to 630 mm. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB906188 General technical conditions for metal cutting machine tools ZBJ50003-88 Determination of cleanliness of metal cutting machine tools ZBnJ50008.1--88 General technical conditions for machining parts of metal cutting machine tools ZBnJ50008.3--88 General technical conditions for assembly of metal cutting machine tools JB/T8486.1-96 Accuracy inspection of CNC universal tool milling machines 3
General requirements
When accepting machine tools according to this standard, the remaining acceptance items in GB9061, ZBnJ50008.1, ZBnJ50008.3 and other standards that are not specified in this standard must be inspected at the same time. 4 Accessories and tools
1 The accessories and tools listed in Table 1 should be supplied randomly. 4.1
Milling cutter bar
Spring milling cutter bar
Intermediate sleeve
Milling chuck (including spring chuck)
Special tools
Anchor bolts
4.2The following special accessories can be supplied according to the agreement: Purpose
Clamping milling cutter
Clamping end milling cutter
Clamping tool
Clamping milling cutter
Disassembly tool, machine tool maintenance
Installation of machine tool
a) Workbench: rotary workbench, CNC rotary workbench, universal angle workbench, universal workbench (only applicable to machine tools with horizontal workbench), CNC universal angle workbench; b) Work head: plug, right-angle milling head, high-speed milling head, universal rotary milling head; c) Indexing device: indexing head, CNC indexing head; d) Measuring device: centering rod, centering instrument; Approved by the Ministry of Machinery Industry of the People's Republic of China on November 7, 1996 and implemented on January 1, 1997
JB/T 8486.2--96
e) Others: spindle sleeve mechanical feed device, machine flat-nose pliers, multi-purpose positioning plate, other chucks, shims, 5 Processing and assembly quality
5.1 Bed columns, lifting platforms, horizontal spindle seats, workbenches, vertical milling head bodies, etc. are important castings and must be aged after rough machining. 5.2 The spindle, spindle sleeve, screw pair, high-speed, heavy-loaded gears and other parts should adopt wear-resistant measures that are suitable for their service life. 5.3 The longitudinal, transverse and vertical guide pairs of the machine tool are important guide pairs, and wear-resistant cast iron, steel-inlaid guides, plastic-coated guides, or high (medium) cheek induction quenching and other wear-resistant measures should be adopted.
5.4 The following joint surfaces should be assessed according to the requirements of "important fixed joint surfaces": a) The joint surface between the longitudinal screw bracket and the vertical workbench (or lifting platform); b) The joint surface between the transverse screw bracket and the horizontal spindle seat; c) The joint surface between the vertical screw seat (nut seat) and the base (or bed column), d) The joint surface between the bed column and the base;
e) The joint surface between the spindle gearbox and the horizontal spindle seat. 5.5 The following joint surfaces shall be assessed according to the requirements of "particularly important fixed joint surfaces": a) the joint surface between the lifting platform and the guide rail pressure plate; b) the joint surface between the vertical workbench and the guide rail pressure plate, c) the joint surface between the steel guide rail and its installation. 5.6 The following guide rail pairs shall be assessed according to the requirements of "sliding (rolling) guide rails": a) the guide rail pair between the lifting platform and the bed column;
b) the guide rail pair between the lifting platform and the vertical workbench or the sliding plate; c) the guide rail pair between the bed column and the horizontal spindle seat.
5.7 The following guide rail pairs and joint surfaces shall be assessed according to the requirements of "displacement guide rails": a) the joint surface between the suspension beam and the horizontal spindle seat;
b) the joint surface between the bracket and the suspension beam;
c) the joint surface between the vertical milling head body and the vertical milling head seat; d) the joint surface between the vertical milling head seat and the horizontal spindle seat; e) the joint surface between the water table and the vertical table. 5.8 Check the cleanliness of the machine tool according to the provisions of ZBJ50003. Generally, it is checked by visual inspection and hand feeling. If necessary, it is checked by weight. The weight of impurities and dirt should not exceed 400mg/L for the circulating lubrication system and 100mg/L for the simple hydraulic system. 5.9 The important positioning pins specified in the design shall be evaluated according to the requirements of ZBnJ50008.3. 6 Machine tool idle operation test
6.1 The main motion mechanism of the machine tool is operated in sequence from the lowest speed (the machine tool with stepless speed change can be operated at low, medium and high speeds). The high-speed operation time shall not be less than 1h, so that the spindle bearing reaches a stable temperature. Measure the temperature and temperature rise of the bearing near the spindle bearing: the temperature shall not exceed 70℃, and the temperature rise shall not exceed 40℃.
6.2 Use low, medium and high feed speeds and fast feed speeds to test the moving parts on the linear motion axis. The operation should be stable, and the working mechanism should be normal and reliable without vibration. 6.3 The actual deviation of the spindle speed with step-speed change shall not exceed -2% to +6% of the indicated value on the nameplate. The actual deviation of the spindle speed with stepless speed change shall be assessed according to the requirements given in the design. 6.4 The actual deviation of the feed speed shall be assessed according to the requirements given in the design. 6.5 Action test
6.5.1 Manual action test
6.5.1.1 The main motion mechanism shall be tested for 10 consecutive forward and reverse starts and stops (including braking) at medium speed. The action shall be flexible and reliable.
JB/T8486.2—96
6.5.1.2 The main motion speed change test shall be carried out step by step (at least low, medium and high speeds shall be taken for stepless speed change). The operating mechanism shall be flexible and reliable.
6.5.1.3Use medium feed speed to conduct 10 times of forward and reverse continuous start, incremental feed and stop operation tests on the moving parts on the linear and rotary coordinates, and the action should be flexible and reliable. 6.5.1.4Use 10 feed speeds including low, medium, high and fast to conduct variable speed operation test on the feed motion mechanism, and the action should be flexible and reliable.
6.5.1.5The hydraulic, lubrication and cooling systems should be tested for sealing, lubrication and cooling performance, requiring easy adjustment, flexible action, good lubrication, sufficient cooling, and no leakage in each system.
6.5.1.6The automatic broaching mechanism of the machine tool should have reliable action. 6.5.1.7Test various indicator lights, control buttons, input and output devices and fans of the digital control device, and the action should be reliable. 6.5.1.8The safety, insurance and protection devices of the machine tool should have flexible and reliable action. 6.5.1.9Test other auxiliary devices of the machine tool, and the function should be reliable. 6.5.2 Automatic action test (can be combined with 6.7 machine tool continuous idle operation test) 6.5.2.1 Use medium speed to conduct forward and reverse continuous start and stop operation test on the main motion mechanism. The action should be flexible and reliable. 6.5.2.2 Perform the main motion speed change test step by step (at least low, medium and high speeds for stepless speed change). The action should be flexible and reliable. 6.5.2.3 Use medium feed speed to conduct forward and reverse continuous start, incremental feed and stop operation test on the moving parts on the linear and rotary coordinates respectively. The action should be flexible and reliable. 6.5.2.4 Use feed speeds including low, medium, high and fast to conduct speed change test on the feed mechanism. The action should be flexible and reliable. 6.5.2.5 Test the CNC functions of the machine tool, such as manual data input, position display, return to reference point, program number indication and retrieval, program pause, program elimination, linear interpolation, circular interpolation, coordinate linkage, cutting cycle, tool position compensation, etc. Each function should be reliable and the action should be flexible.
6.5.2.6 Conduct online tests on the CNC rotary table, CNC universal table, CNC dividing head, etc. of the machine tool, and the action should be reliable. 6.6 The idling power of the main transmission system (excluding the no-load power of the main motor) shall not exceed the provisions of Table 2. Table 2
Main motion speed change form
Mechanical speed change
Motor speed regulation
6.7 Continuous idling test of machine tool
Main motor power ≤4kw
Main motor power 4kW
Idling power/main motor rated power %45
6.7.1 The continuous idling test shall be carried out after the tests (or inspections) specified in 6.1~6.5 and before the accuracy inspection. 6.7.2 The machine tool shall be operated by a digital control program including various processing functions of the machine tool to carry out a continuous operation test of the whole machine for a period of not less than 16 hours. The operation shall be stable and reliable, and no failure shall occur. 6.7.3 The interval between each automatic cycle shall not exceed 1min. 7 Load test of machine tools (performed in accordance with the load test specifications specified in the design) 7.1 The machine tool shall be subjected to the following load tests:
a) Operation test of the machine tool bearing the maximum weight of the workpiece (spot check), b) Test of the maximum torque of the machine tool main transmission system; c) Test of the machine tool main transmission system reaching the maximum power (spot check). 7.2 Operation test of the machine tool bearing the maximum weight of the workpiece 7.2.1 Select equivalent weights according to the weight specified in the design and distribute them evenly on the horizontal work surface. 377
JB/T 8486.2--96
7.2.2 Move the lifting platform up and down at the lowest and highest feed speeds and quickly, respectively. When moving at the lowest feed speed, it is generally carried out at the lower end of the vertical stroke, and the moving distance is not less than 20mm; when moving at the highest feed speed and quickly, it is carried out in the middle of the vertical stroke, and the moving distance is not less than half of the stroke. 7.2.3 The machine tool should run smoothly and reliably at the highest feed speed and rapid movement; there should be no obvious deviation phenomenon when moving at the lowest feed speed; after the test, the accuracy of the machine tool should be stable. 7.3 Test of the maximum torque of the main transmission system of the machine tool 7.3.1 In the speed regulation range of the constant torque of the main transmission system, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount so that the main transmission system reaches the maximum torque specified in the design. 7.3.2 The test piece material is HT200 or 45 steel, and the cutting tool: the horizontal spindle uses a cylindrical milling cutter or a face (end) milling cutter; the vertical spindle uses a face (end) milling cutter.
7.3.3 During the cutting test, the machine tool should work normally and the movement should be stable. 7.4 Test of the main transmission system of the machine tool to reach the maximum power 7.4.1 In the speed regulation range of the constant power of the main transmission system, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount so that the power of the main transmission system reaches the rated power of the main motor or the maximum power specified in the design. 7.4.2 The test piece material is 45 steel; the cutting tool is a carbide milling cutter. 7.4.3 During the test, the machine tool should operate normally, stably and reliably, and the metal removal rate should be recorded. The metal removal rate should reach the value specified in the design. 8 Minimum setting unit test of linear motion axis 8.1 Test method
First, quickly move the moving part on the linear motion axis to a certain distance in the positive (or negative) direction. After stopping, give several minimum setting unit instructions in the same direction, and then stop again. Use this position as the reference position, give one at a time, and give a total of 20 minimum setting unit instructions. Move in the same direction and measure the stop position of each instruction. From the above-mentioned final position, continue to give several minimum setting unit instructions in the same direction. After stopping, give several minimum setting unit instructions in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these positive and negative minimum setting unit instructions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, a total of 20 minimum setting units, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, see Figure 1. When returning, remove the displacement height of several minimum setting units and do not measure the actual moving distance
Minimum setting unit
Each linear motion axis must be tested at least in the middle and at both ends of the stroke. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error of this item. 8.2 Error calculation method
8.2.1 Minimum setting unit error S.
S, =IL;-m Imax
Where: L,—
JB/T 8486.2—-96
-Actual displacement of a minimum setting unit instruction, mm; Theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be negative. 8.2.2 Minimum setting unit relative error Sb
Where. S-
8.3 Tolerance
Minimum setting unit relative error;
X 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. Sa: According to the design regulations of the manufacturer;
Sb: Not more than 25%.
8.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Test method
The moving parts on each linear motion axis, from any point on the stroke, in the same moving direction, quickly return to the origin P. Test 5 times. Measure the deviation X (i=1,2,,5) between the actual position Pi and the theoretical position P. of the origin each time, see Figure 2. Each linear motion axis is tested at least in the middle of the stroke and at any three positions near both ends. Xo
9.2 Error calculation method
In each linear motion axis, the maximum value of 6 times the standard deviation of the origin return deviation is the origin return error, as shown in formula (3) to formula (6). Xo Po— P.
In the formula: Xio---origin return deviation, mm, Pn——-actual displacement value of origin return, mm, P. ——theoretical value of origin, mm;
R. =(6Ss)max
X. —average deviation of origin return deviation, mm, S. ——standard deviation of origin return error, mm; R. Origin return error, mrn.
9.3 Tolerance
Tolerance shall be in accordance with the design regulations of the manufacturer (R is recommended, not more than 1/2 of the repeat positioning accuracy). (3)
(4)
.(5)
·(6)
9.4 Inspection tools
JB/T 8486.2--96
Laser interferometer or reading microscope and metal wire scale. 10 Machine tool accuracy inspection
10.1 Accuracy inspection shall be carried out in accordance with JB/T8486.1. 10.2 The following items shall be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the axis of the taper hole of the G8 horizontal spindle; b) Parallelism of the horizontal (universal) worktable surface of the G10 horizontal spindle seat lateral movement; c) Perpendicularity of the rotation axis of the G15 vertical spindle to the horizontal (universal) worktable surface; d) Radial runout of the axis of the taper hole of the G17 vertical spindle. 10.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The surface roughness R of the test piece after fine milling. The value should not be greater than 3.2am. The working accuracy should be inspected and qualified at one time.
Random Technical Documents
11.1 Two copies of the machine tool instruction manual should be provided randomly. 11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection results of the relevant position accuracy items. 3802 Move the lifting platform up and down at the lowest and highest feed speeds and quickly. When moving at the lowest feed speed, it is generally carried out at the lower end of the vertical stroke, and the moving distance is not less than 20mm; when moving at the highest feed speed and fast, it is carried out in the middle of the vertical stroke, and the moving distance is not less than half of the stroke. 7.2.3 When moving at the highest feed speed and fast, the machine tool should operate smoothly and reliably; when moving at the lowest feed speed, there should be no obvious wandering phenomenon; after the test, the accuracy of the machine tool should be stable. .3 Test of the maximum torque of the main transmission system of the machine tool 7.3.1 Within the speed regulation range of the constant torque of the main transmission system, select an appropriate spindle speed and use milling to conduct the test. Adjust the cutting amount so that the main transmission system reaches the maximum torque specified in the design. 7.3.2 The material of the test piece is HT200 or 45 steel, and the cutting tool: the horizontal spindle uses a cylindrical milling cutter or a face (end) milling cutter; the vertical spindle uses a face (end) milling cutter.
7.3.3 During the cutting test, the machine tool should work normally and move smoothly. 7.4 Test of the main transmission system of the machine tool reaching maximum power 7.4.1 Within the speed regulation range of the constant power of the main transmission system, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount so that the power of the main transmission system reaches the rated power of the main motor or the maximum power specified in the design. 7.4.2 The test piece material is 45 steel; the cutting tool is a carbide milling cutter. 7.4.3 During the test, the machine tool should operate normally, stably and reliably, and the metal removal rate should be recorded. The metal removal rate should reach the value specified in the design. 8 Minimum setting unit test of linear motion axis 8.1 Test method
First, quickly move the moving part on the linear motion axis to a certain distance in the positive (or negative) direction. After stopping, give several minimum setting unit instructions in the same direction, and then stop. Use this position as the reference position, give one at a time, and give a total of 20 minimum setting unit instructions, move in the same direction, and measure the stop position of each instruction. From the above-mentioned final position, continue to give instructions of several minimum setting units in the same direction. After stopping, give instructions of several minimum setting units in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these instructions of several minimum setting units in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, a total of 20 instructions of the minimum setting units, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, as shown in Figure 1. When returning, remove the displacement height of several minimum setting units and do not measure the actual moving distance
minimum setting unit
Each linear motion axis must be tested at least in the middle and at both ends of the stroke. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error of this item. 8.2 Error calculation method
8.2.1 Minimum setting unit error S.
S, =IL;-m Imax
Where: L,—
JB/T 8486.2—-96
-Actual displacement of a minimum setting unit instruction, mm; Theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 8.2.2 Minimum setting unit relative error Sb
Where. S-
8.3 Tolerance
Minimum setting unit relative error;
X 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. Sa: According to the design regulations of the manufacturer;
Sb: Not more than 25%.
8.4 Inspection tools
Laser interferometer or reading microscope and metal wire ruler. 9 Origin return test
9.1 Test method
The moving parts on each linear motion axis are tested to return to the origin P. quickly 5 times from any point on the stroke in the same moving direction. The deviation X (i=1,2,,5) between the actual position Pi and the theoretical position P. of the origin is measured each time, see Figure 2. Each linear motion axis is tested at least in the middle of the stroke and at any three positions near the two ends. Xo
9.2 Error calculation method
The maximum value of 6 times the standard deviation of the origin return deviation in each linear motion axis is the origin return error, as shown in formula (3) to formula (6). Xo Po— P.
Where: Xio---origin return deviation, mm, Pn——-actual displacement value of origin return, mm, P. ——Theoretical value of origin, mm;
R. =(6Ss)max
X. —Average deviation of origin return deviation, mm, S. ——Standard deviation of origin return error, mm; R. Origin return error, mrn.
9.3 Tolerance
Tolerance shall be in accordance with the design requirements of the manufacturer (R is recommended, not more than 1/2 of the repeat positioning accuracy). (3)
(4)
.(5)
·(6)
9.4 Inspection tools
JB/T 8486.2--96
Laser interferometer or reading microscope and metal wire scale. 10 Machine tool accuracy inspection
10.1 Accuracy inspection shall be carried out in accordance with JB/T8486.1. 10.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the G8 horizontal spindle taper hole axis; b) Parallelism of the G10 horizontal spindle seat lateral movement to the horizontal (universal) work table; c) Perpendicularity of the G15 vertical spindle rotation axis to the horizontal (universal) work table; d) Radial runout of the G17 vertical spindle taper hole axis. 10.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The R value of the surface roughness of the test piece after fine milling should not be greater than 3.2am. The working accuracy should be inspected and qualified once.
Random technical documents
11.1 Two copies of the machine tool instruction manual should be randomly supplied. 11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection results of the relevant position accuracy items. 3802 Move the lifting platform up and down at the lowest and highest feed speeds and quickly. When moving at the lowest feed speed, it is generally carried out at the lower end of the vertical stroke, and the moving distance is not less than 20mm; when moving at the highest feed speed and fast, it is carried out in the middle of the vertical stroke, and the moving distance is not less than half of the stroke. 7.2.3 When moving at the highest feed speed and fast, the machine tool should operate smoothly and reliably; when moving at the lowest feed speed, there should be no obvious wandering phenomenon; after the test, the accuracy of the machine tool should be stable. .3 Test of the maximum torque of the main transmission system of the machine tool 7.3.1 Within the speed regulation range of the constant torque of the main transmission system, select an appropriate spindle speed and use milling to conduct the test. Adjust the cutting amount so that the main transmission system reaches the maximum torque specified in the design. 7.3.2 The material of the test piece is HT200 or 45 steel, and the cutting tool: the horizontal spindle uses a cylindrical milling cutter or a face (end) milling cutter; the vertical spindle uses a face (end) milling cutter.
7.3.3 During the cutting test, the machine tool should work normally and move smoothly. 7.4 Test of the main transmission system of the machine tool reaching maximum power 7.4.1 Within the speed regulation range of the constant power of the main transmission system, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount so that the power of the main transmission system reaches the rated power of the main motor or the maximum power specified in the design. 7.4.2 The test piece material is 45 steel; the cutting tool is a carbide milling cutter. 7.4.3 During the test, the machine tool should operate normally, stably and reliably, and the metal removal rate should be recorded. The metal removal rate should reach the value specified in the design. 8 Minimum setting unit test of linear motion axis 8.1 Test method
First, quickly move the moving part on the linear motion axis to a certain distance in the positive (or negative) direction. After stopping, give several minimum setting unit instructions in the same direction, and then stop. Use this position as the reference position, give one at a time, and give a total of 20 minimum setting unit instructions, move in the same direction, and measure the stop position of each instruction. From the above-mentioned final position, continue to give instructions of several minimum setting units in the same direction. After stopping, give instructions of several minimum setting units in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these instructions of several minimum setting units in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, a total of 20 instructions of the minimum setting units, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, see Figure 1. When returning, remove the displacement height of several minimum setting units and do not measure the actual moving distance
minimum setting unit
Each linear motion axis must be tested at least in the middle and at both ends of the stroke. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error of this item. 8.2 Error calculation method
8.2.1 Minimum setting unit error S.
S, =IL;-m Imax
Where: L,—
JB/T 8486.2—-96
-Actual displacement of a minimum setting unit instruction, mm; Theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 8.2.2 Minimum setting unit relative error Sb
Where. S-
8.3 Tolerance
Minimum setting unit relative error;
X 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. Sa: According to the design regulations of the manufacturer;
Sb: Not more than 25%.
8.4 Inspection tools
Laser interferometer or reading microscope and metal wire ruler. 9 Origin return test
9.1 Test method
The moving parts on each linear motion axis are tested to return to the origin P. quickly 5 times from any point on the stroke in the same moving direction. The deviation X (i=1,2,,5) between the actual position Pi and the theoretical position of the origin P. is measured each time, see Figure 2. Each linear motion axis is tested at least in the middle of the stroke and at any three positions near the two ends. Xo
9.2 Error calculation method
The maximum value of 6 times the standard deviation of the origin return deviation in each linear motion axis is the origin return error, as shown in formula (3) to formula (6). Xo Po— P.
Where: Xio---origin return deviation, mm, Pn——-actual displacement value of origin return, mm, P. ——Theoretical value of origin, mm;
R. =(6Ss)max
X. —Average deviation of origin return deviation, mm, S. ——Standard deviation of origin return error, mm; R. Origin return error, mrn.
9.3 Tolerance
Tolerance shall be in accordance with the design requirements of the manufacturer (R is recommended, not more than 1/2 of the repeat positioning accuracy). (3)
(4)
.(5)
·(6)
9.4 Inspection tools
JB/T 8486.2--96
Laser interferometer or reading microscope and metal wire scale. 10 Machine tool accuracy inspection
10.1 Accuracy inspection shall be carried out in accordance with JB/T8486.1. 10.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the G8 horizontal spindle taper hole axis; b) Parallelism of the G10 horizontal spindle seat lateral movement to the horizontal (universal) work table; c) Perpendicularity of the G15 vertical spindle rotation axis to the horizontal (universal) work table; d) Radial runout of the G17 vertical spindle taper hole axis. 10.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The R value of the surface roughness of the test piece after fine milling should not be greater than 3.2am. The working accuracy should be inspected and qualified once.
Random technical documents
11.1 Two copies of the machine tool instruction manual should be randomly supplied. 11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection results of the relevant position accuracy items. 3802—-96
-Actual displacement of a minimum setting unit instruction, mm; theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 8.2.2 Minimum setting unit relative error Sb
Where. S-
8.3 Tolerance
Minimum setting unit relative error;
X 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. Sa: According to the design regulations of the manufacturer;
Sb: shall not exceed 25%.
8.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Test method
The moving parts on each linear motion axis are tested by returning to the origin P five times quickly from any point on the stroke in the same moving direction. Measure the deviation X (i=1, 2,, 5) between the actual position Pi and the theoretical position of the origin P. each time, see Figure 2. Each linear motion axis shall be tested at least in the middle of the stroke and at any three positions near both ends. Xowww.bzxz.net
9.2 Error calculation method
The maximum value of 6 times the standard deviation of the origin return deviation in each linear motion axis is the origin return error, as shown in formula (3) to formula (6). Xo Po— P.
Where: Xio---origin return deviation, mm, Pn——-actual displacement value of origin return, mm, P. ——theoretical value of origin, mm;
R. =(6Ss)max
X. —average deviation of origin return deviation, mm, S. ——standard deviation of origin return error, mm; R. Origin return error, mmrn.
9.3 Tolerance
Tolerance shall be in accordance with the manufacturer's design requirements (recommended R, not more than 1/2 of the repeatability). (3)
(4)
.(5)
·(6)
9.4 Inspection tools
JB/T 8486.2--96
Laser interferometer or reading microscope and metal wire scale. 10 Machine tool accuracy inspection
10.1 Accuracy inspection shall be carried out in accordance with JB/T8486.1. 10.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the G8 horizontal spindle taper hole axis; b) Parallelism of the G10 horizontal spindle seat lateral movement to the horizontal (universal) work table; c) Perpendicularity of the G15 vertical spindle rotation axis to the horizontal (universal) work table; d) Radial runout of the G17 vertical spindle taper hole axis. 10.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The R value of the surface roughness of the test piece after fine milling should not be greater than 3.2am. The working accuracy should be inspected and qualified once.
Random technical documents
11.1 Two copies of the machine tool instruction manual should be randomly supplied. 11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection results of the relevant position accuracy items. 3802—-96
-Actual displacement of a minimum setting unit instruction, mm; theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 8.2.2 Minimum setting unit relative error Sb
Where. S-
8.3 Tolerance
Minimum setting unit relative error;
X 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. Sa: According to the design regulations of the manufacturer;
Sb: shall not exceed 25%.
8.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Test method
The moving parts on each linear motion axis are tested by returning to the origin P five times quickly from any point on the stroke in the same moving direction. Measure the deviation X (i=1, 2,, 5) between the actual position Pi and the theoretical position of the origin P. each time, see Figure 2. Each linear motion axis shall be tested at least in the middle of the stroke and at any three positions near both ends. Xo
9.2 Error calculation method
The maximum value of 6 times the standard deviation of the origin return deviation in each linear motion axis is the origin return error, as shown in formula (3) to formula (6). Xo Po— P.
Where: Xio---origin return deviation, mm, Pn——-actual displacement value of origin return, mm, P. ——theoretical value of origin, mm;
R. =(6Ss)max
X. —average deviation of origin return deviation, mm, S. ——standard deviation of origin return error, mm; R. Origin return error, mmrn.
9.3 Tolerance
Tolerance shall be in accordance with the manufacturer's design requirements (recommended R, not more than 1/2 of the repeatability). (3)
(4)
.(5)
·(6)
9.4 Inspection tools
JB/T 8486.2--96
Laser interferometer or reading microscope and metal wire scale. 10 Machine tool accuracy inspection
10.1 Accuracy inspection shall be carried out in accordance with JB/T8486.1. 10.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the G8 horizontal spindle taper hole axis; b) Parallelism of the G10 horizontal spindle seat lateral movement to the horizontal (universal) work table; c) Perpendicularity of the G15 vertical spindle rotation axis to the horizontal (universal) work table; d) Radial runout of the G17 vertical spindle taper hole axis. 10.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The R value of the surface roughness of the test piece after fine milling should not be greater than 3.2am. The working accuracy should be inspected and qualified once.
Random technical documents
11.1 Two copies of the machine tool instruction manual should be randomly supplied. 11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection results of the relevant position accuracy items. 380
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