JB/T 9928.2-1999 Technical requirements for CNC vertical lifting table milling machines
Some standard content:
1 Scope
Machinery Industry Standard of the People's Republic of China
CNC Vertical Lift Table Milling Machine
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC vertical lift table milling machines. This standard is applicable to CNC vertical lift table milling machines with a worktable width of 200 to 500 mm. 2 Referenced Standards
JB/T 9928.21999
Replaces ZB J54015--88
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T5226.1--1996 Industrial machinery electrical equipment Part 1: General technical conditions GB/T9061--1988 General technical conditions for metal cutting machine tools GB/T10931-1989 Method for evaluating the position accuracy of digitally controlled machine tools GB15760-1995 General technical conditions for safety protection of metal cutting machine tools GB/T16769-1997 Method for measuring the sound pressure level of noise of metal cutting machine tools JB/T3579-1991 General technical conditions for epoxy coated sliding guides 9 General technical conditions for machining parts of metal cutting machine tools JB/T 9872--1999
9 General technical conditions for assembly of metal cutting machine tools JB/T 9874-1999
JB/T 9877—1999
Determination of cleanliness of metal cutting machine tools
JB/T9928.1—1999Precision inspection of CNC vertical lifting table milling machinesJB/T10051—1999
General technical conditions for hydraulic systems of metal cutting machine tools3 General requirementswww.bzxz.net
When accepting machine tools according to this standard, the remaining acceptance items in GB/T9061, JB/T9872, JB/T9874 and other standards that are not specified in this standard must be inspected at the same time.
4 Accessories and tools
4.1 The following accessories and tools should be randomly supplied with the machine tool: a) Intermediate sleeve, 1 set;
b) Pull nails for 7:24 taper shanks, 1 set;
c) Milling chuck, 1 set;
d) Special adjustment tool, 1 set.
4.2 The following special accessories can be supplied according to the agreement: a) Cutting tools that expand the performance of machine tools; b) Tool setting instrument;
Approved by the State Bureau of Machinery Industry on May 20, 1999 710
Implemented on January 1, 2000
c) Indexing table;
d) CNC rotary table;
e) Control system peripheral equipment.
5 Safety and Health
JB/T 9928.2—1999
5.1 The safety of the electrical system of the machine tool shall comply with the provisions of GB/T5226.1. 5.2 The safety of the hydraulic system of the machine tool shall comply with the provisions of JB/T10051. 5.3 The noise of the machine tool shall be tested according to the provisions of GB/T16769. The sound pressure level of the whole machine noise of the machine tool shall not exceed 83dB(A). 5.4 The safety protection of the machine tool shall comply with the provisions of GB15760. The moving parts of its linear coordinates shall be equipped with overtravel safety devices. 5.5 If the broaching mechanism and other important mechanisms use disc springs, they shall be subjected to working pressure tests according to the design requirements after assembly. 6 Processing and assembly quality
6.1 The guide rails in the three directions of the machine tool must take wear-resistant measures. 6.2 The bed column, lifting platform, workbench, bed saddle, milling head body, and slide are important castings. After rough processing, they must be aged or other measures to eliminate internal stress must be taken.
6.3 The glued and coated guide rails should be firm and reliable, without gaps and bubbles, and the contact indicators with the matching guide rails should comply with the provisions of JB/T3579.
6.4 The steel-mounted guide rails should be tested for flaw detection and no cracks should be found. 6.5 The assembly of the hydraulic system shall comply with the relevant provisions of JB/T10051. 6.6 The assembly of the electrical system shall comply with the relevant provisions of GB/T5226.1. 6.7 The high-speed rotating spindle assembly shall be subjected to a balancing test. 6.8 The adjustment amount of the screw pair with a source elimination mechanism after assembly shall comply with the design requirements. 6.9 The surfaces of the following guide rails and their accessories shall be assessed in accordance with the requirements of "sliding (rolling) guide rails": a) The surfaces of the workbench guide rails and their accessories; b) The surfaces of the saddle guide rails and their accessories; c) The surfaces of the lifting platform (or sliding milling head) guide rails and their accessories; d) The surfaces of the ram guide rails and their accessories. 6.10 The surfaces of the following guide rails and their accessories shall be assessed in accordance with the requirements of "displacement guide rails": a) The surface of the rotating surface of the milling head with rotating performance and its accessories; b) The surface of the movable milling head (lifting platform) guide rails and its accessories. 6.11 The following joint surfaces shall be assessed according to the requirements of "particularly important fixed joint surfaces": a) the fixed joint surface of the screw bracket;
b) the fixed joint surface of the nut seat;
c) the joint surface between the vertical screw sleeve and the base.
6.12 The following fixed joint surfaces shall be assessed according to the requirements of "important fixed joint surfaces": a) the fixed joint surface of the sliding guide plate; b) the fixed joint surface between the bed column and the base;
c) the fixed joint surface between the main shaft gearbox and the bed column. 6.13 The cleanliness shall be inspected according to the provisions of JB/T9877, and the internal cleanliness of the main transmission box and hydraulic oil tank shall be inspected by weight. The weight of impurities and dirt: the main transmission box shall not exceed 400mg/L; the hydraulic tank shall not exceed 200mg/L. 7 Operation test of machine tools
7.1 Idle operation test of machine tools
JB/T 9928.2--1999
7.1.1 The spindle with continuously variable speed shall be tested at no less than 12 speeds, and the spindle with stepped speed shall be tested at each speed from the lowest to the highest. The operation time at each level shall be no less than 2 minutes, and the operation time at the highest speed shall be no less than 1 hour. The spindle bearings shall reach a stable temperature, and the temperature and temperature rise of the spindle bearings shall be checked. The temperature shall not exceed 70°C, and the temperature rise shall not exceed 40°C. The actual deviation of the spindle speed shall be checked, which shall not exceed 2% to 10% of the given value. 7.1.2 The idling power of the main transmission system shall be assessed according to Table 1: When the rated power of the main motor is less than the motor power specified in the model spectrum, it is allowed to be calculated according to the power specified in the model spectrum. Table 1
Speed change form
Mechanical speed change
Motor speed regulation
Idle running power is not more than the percentage of the rated power of the main motor %30
7.1.3 For the moving parts on the linear motion coordinates of the machine tool, the idle running test is carried out at low, medium, high feed speeds and fast speeds respectively. The moving parts should move smoothly, flexibly and reliably without vibration and creeping. The actual deviation of the feed speed should not exceed -5%~+3% of the given value.
7.2 Functional test of machine tool
7.2.1 Manual control function test
Function test of various parts of the machine tool by manual or CNC manual operation. 7.2.1.1 At medium speed, the spindle is continuously tested for 10 times of forward and reverse start and stop (including braking). The action should be flexible and reliable.
7.2.1.2 For the continuously variable speed spindle, at least at the lowest, middle and highest speeds, and for the step-speed spindle, at each speed, the speed change operation test shall be carried out. The action shall be flexible and reliable. 7.2.1.3 At the medium feed speed, the moving parts on the linear motion coordinate shall be tested for starting and stopping in the forward and reverse directions for 10 times respectively. The action shall be flexible and reliable. 7.2.1.4 Select appropriate incremental feed and carry out the forward and reverse operation test for the moving parts on the linear motion coordinate for 10 times respectively. The action shall be flexible and reliable.
7.2.1.5 Select 10 feed speeds and carry out the speed change operation test on the feed system. The action shall be flexible and reliable. 7.2.1.6 Test the various indicator lights, control buttons, paper tape readers and fans of the digital control device. The action shall be flexible and reliable. 7.2.1.7 Test the reliability of the machine tool lubrication device. The requirements include easy adjustment, flexible action, good lubrication, and no leakage of the lubrication pipe joints.
7.2.1.8 Test the safety, insurance and protection devices of the machine tool. The functions should be reliable. 7.2.1.9 Test the cooling system and various auxiliary devices. The operation should be reliable. 7.2.2 Automatic control function test
Function test of various parts of the machine tool using CNC program. 7.2.2.1 At medium speed, the spindle is continuously started and stopped (including braking) for 10 times in forward and reverse rotation. The action should be flexible and reliable.
7.2.2.2 The continuously variable speed spindle is tested at least at the speed including the lowest, middle and highest speeds. The automatic step-speed spindle is tested at each speed. The action should be flexible and reliable. 7.2.2.3 At least at the speeds including the lowest, middle and highest feed speeds and fast speed, the feed system shall be tested for variable speed operation. The action shall be flexible and reliable.
7.2.2.4 Test the numerical control functions of the machine tool, such as positioning, linear interpolation, circular interpolation, coordinate linkage, etc. Each function shall be reliable. 7.2.2.5 Conduct a machine-connected test on the numerical control turntable and numerical control indexing table of the machine tool. The action shall be reliable. 7.3 Continuous idle operation test of the machine tool
The continuous idle operation test is a non-cutting continuous operation test conducted by operating various parts of the machine tool using a numerical control program including various processing functions of the machine tool after the test described in 7.17.2 (the test items of 7.2.2 can be arranged in this item) and before the geometric accuracy inspection. The continuous operation time without failure is generally not less than 24 hours. Load test of machine tools
This series of machine tools shall be subjected to the following load tests: a) Operation test with the maximum weight of the workpiece (spot check); b) Test of the maximum torque of the main transmission system; c) Test of the main transmission system reaching the maximum power (spot check). 8.1 Operation test with the maximum weight of the workpiece 8.1.1 A weight equivalent to the maximum weight of the workpiece specified in the design can be used as the workpiece and placed on the workbench to make its load evenly hooked. 8.1.2 During the test, the workbench is located in the middle of the longitudinal and transverse strokes. 8.1.3 Move the lifting platform up and down at the lowest and highest feed speeds and fast speeds, and reciprocate once each. 8.1.4 When operating at the lowest speed, it is generally carried out near the lower end of the vertical stroke, and the moving distance is not less than 20mm; when operating at the highest speed and fast speed, the moving distance is not less than 1/2 of the stroke.
8.1.5 It should be stable and reliable when operating at high speed, and there should be no fat travel phenomenon when operating at low speed. 8.2 Test of the maximum torque of the main transmission system
8.2.1 Select an appropriate speed within the constant torque speed range of the spindle and conduct a cutting test. The cutting amount can be adjusted so that the torque on the spindle reaches the maximum torque specified in the design.
8.2.2 When the main transmission system transmits the maximum torque, check whether the various parts of the machine tool work normally and reliably. 8.2.3 The cutting tool adopts an insert end mill. 8.2.4 The test piece material adopts HT150.
8.3 Test of the main transmission system reaching maximum power 8.3.1 Select an appropriate speed within the constant power speed range of the spindle and conduct a cutting test. The cutting amount can be adjusted so that the main motor reaches the rated power.
8.3.2 When the main motor reaches the maximum power cutting, check whether the various parts of the machine tool work normally and reliably. There should be no abnormal noise and vibration.
8.3.3 The cutting tool adopts an insert end mill. 8.3.4 The test piece material adopts 45 steel.
9 Minimum setting unit test of linear motion axis 9.1 Test method
First, use a fast speed to make the moving part on the linear motion axis move a certain distance in the positive (or negative) direction and then stop, and then give several minimum setting unit instructions in the same direction to make the moving part stop at a certain position, and use this position as the reference position. Then, give one instruction in the same direction at a time, a total of 20 minimum setting units, so that the moving part moves and stops continuously, and measure its stop position under each instruction. From the above-mentioned final measurement position, continue to give several minimum setting unit instructions in the same direction to make the moving part move and stop, and then give several minimum setting unit instructions in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position. The stop position of the moving part under these positive and negative instructions of several minimum setting units is not measured. Then, give one instruction in the negative (or positive) direction at a time, a total of 20 minimum setting units, continue to make the moving part move continuously, stop, and return to the reference position approximately, and measure its stop position under each instruction, see Figure 1. Note: It must be noted that sometimes the actual moving direction is not consistent with the command direction. Each linear motion axis must be tested at least in the middle of the stroke and at three positions near the two ends. Calculate the error in accordance with the provisions of 9.2, and take the maximum error value at the three positions. 713
The stop position of several minimum setting unit command components
is not measured
Measurement garden
9.2 Error calculation method
9.2.1 Minimum setting unit error S
JB/T 9928. 2-1999
Actual moving distance
Assume the wind change
Effective condensation effect
Minimum setting unit
The minimum setting unit error is calculated as the maximum absolute value of the difference between the actual displacement and the theoretical value of a minimum setting unit command in each position test on each linear motion axis, as shown in formula (1). S,| L; m [max
Where: S. —Minimum setting unit error, mm; L, —---Actual displacement value of a certain minimum setting unit instruction (i=1 or 2, 3-...-20), mm, m
Theoretical value of a minimum setting unit instruction, mn. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in each position test on each linear motion axis as a percentage of the theoretical value of 20 minimum setting unit instructions, as shown in formula (2). 20m
Where: S—Minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S. should not be greater than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
(2)
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least at the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
Origin return error, calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the mean deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
It shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.32—1999
Before any precision inspection, a non-cutting continuous operation test is conducted by operating various parts of the machine tool using a digital control program including various processing functions of the machine tool. The continuous operation without failure time is generally not less than 24 hours. Load test of machine tools
This series of machine tools should be subjected to the following load tests: a) Operation test with the maximum weight of the workpiece (spot check); b) Test of the maximum torque of the main transmission system; c) Test of the main transmission system reaching maximum power (spot check). 8.1 Operation test with the maximum weight of the workpiece 8.1.1 A heavy object equivalent to the maximum weight of the workpiece specified in the design can be used as the workpiece and placed on the workbench to make its load evenly hooked. 8.1.2 During the test, the workbench is located in the middle of the longitudinal and transverse strokes. 8.1.3 Move the lifting platform up and down at the lowest and highest feed speeds and fast speeds respectively, and reciprocate once each. 8.1.4 When running at the lowest speed, it is generally carried out near the lower end of the vertical stroke, and the moving distance is not less than 20mm; when running at the highest speed and fast speed, the moving distance is not less than 1/2 of the stroke.
8.1.5 It should be stable and reliable when running at high speed, and there should be no fat running phenomenon when running at low speed. 8.2 Test of maximum torque of main transmission system
8.2.1 Select an appropriate speed within the constant torque speed range of the spindle and conduct cutting test. The cutting amount can be adjusted so that the torque on the spindle reaches the maximum torque specified in the design.
8.2.2 When the main transmission system transmits the maximum torque, check whether the various parts of the machine tool work normally and reliably. 8.2.3 The cutting tool adopts the insert end mill. 8.2.4 The test piece material adopts HT150.
8.3 Test of main transmission system reaching maximum power8.3.1 Select an appropriate speed within the constant power speed range of the spindle and conduct cutting test. The cutting amount can be adjusted so that the main motor reaches the rated power.
8.3.2 When the main motor reaches the maximum power cutting, check whether the various parts of the machine tool work normally and reliably. There should be no abnormal noise and vibration.
8.3.3 The cutting tool is an insert end mill. 8.3.4 The test piece material is 45 steel.
9 Minimum setting unit test of linear motion axis 9.1 Test method
First, the moving part on the linear motion axis is quickly moved to a certain distance in the positive (or negative) direction and then stopped. Then, several minimum setting unit instructions are given in the same direction to make the moving part stop at a certain position, and this position is used as the reference position. Then, one instruction is given in the same direction at a time, for a total of 20 minimum setting units, so that the moving part moves and stops continuously, and its stop position under each instruction is measured. From the above-mentioned final measurement position, several minimum setting unit instructions are continued to be given in the same direction to make the moving part move and stop, and then several minimum setting unit instructions are given in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position. The stop position of the moving part under these positive and negative minimum setting unit instructions is not measured. Then, give instructions in the negative (or positive) direction for a total of 20 minimum setting units, continue to move the moving part continuously, stop, return to the reference position approximately, and measure its stop position under each instruction, see Figure 1. Note: It must be noted that sometimes the actual moving direction is not consistent with the instruction direction. Each linear motion axis must be tested at least in the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 9.2, and calculate the maximum error value at the three positions. 713
The stop position of several minimum setting unit command components
is not measured
Measurement garden
9.2 Error calculation method
9.2.1 Minimum setting unit error S
JB/T 9928. 2-1999
Actual moving distance
Assume the change of wind speed
Effective effect
Minimum setting unit
The minimum setting unit error is calculated by the maximum absolute value of the difference between the actual displacement and the theoretical value of a minimum setting unit command in each position test on each linear motion axis, as shown in formula (1). S,| L; m [max
Where: S. —Minimum setting unit error, mm; L, —---Actual displacement value of a certain minimum setting unit instruction (i=1 or 2, 3-...-20), mm, m
Theoretical value of a minimum setting unit instruction, mn. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in each position test on each linear motion axis as a percentage of the theoretical value of 20 minimum setting unit instructions, as shown in formula (2). 20m
Where: S—Minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S. should not be greater than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
(2)
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least at the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
Origin return error, calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the mean deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
It shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.32—1999
Before any precision inspection, a non-cutting continuous operation test is conducted by operating various parts of the machine tool using a digital control program including various processing functions of the machine tool. The continuous operation without failure time is generally not less than 24 hours. Load test of machine tools
This series of machine tools should be subjected to the following load tests: a) Operation test with the maximum weight of the workpiece (spot check); b) Test of the maximum torque of the main transmission system; c) Test of the main transmission system reaching maximum power (spot check). 8.1 Operation test with the maximum weight of the workpiece 8.1.1 A heavy object equivalent to the maximum weight of the workpiece specified in the design can be used as the workpiece and placed on the workbench to make its load evenly hooked. 8.1.2 During the test, the workbench is located in the middle of the longitudinal and transverse strokes. 8.1.3 Move the lifting platform up and down at the lowest and highest feed speeds and fast speeds respectively, and reciprocate once each. 8.1.4 When running at the lowest speed, it is generally carried out near the lower end of the vertical stroke, and the moving distance is not less than 20mm; when running at the highest speed and fast speed, the moving distance is not less than 1/2 of the stroke.
8.1.5 It should be stable and reliable when running at high speed, and there should be no fat running phenomenon when running at low speed. 8.2 Test of maximum torque of main transmission system
8.2.1 Select an appropriate speed within the constant torque speed range of the spindle and conduct cutting test. The cutting amount can be adjusted so that the torque on the spindle reaches the maximum torque specified in the design.
8.2.2 When the main transmission system transmits the maximum torque, check whether the various parts of the machine tool work normally and reliably. 8.2.3 The cutting tool adopts the insert end mill. 8.2.4 The test piece material adopts HT150.
8.3 Test of main transmission system reaching maximum power8.3.1 Select an appropriate speed within the constant power speed range of the spindle and conduct cutting test. The cutting amount can be adjusted so that the main motor reaches the rated power.
8.3.2 When the main motor reaches the maximum power cutting, check whether the various parts of the machine tool work normally and reliably. There should be no abnormal noise and vibration.
8.3.3 The cutting tool is an insert end mill. 8.3.4 The test piece material is 45 steel.
9 Minimum setting unit test of linear motion axis 9.1 Test method
First, the moving part on the linear motion axis is quickly moved to a certain distance in the positive (or negative) direction and then stopped. Then, several minimum setting unit instructions are given in the same direction to make the moving part stop at a certain position, and this position is used as the reference position. Then, one instruction is given in the same direction at a time, for a total of 20 minimum setting units, so that the moving part moves and stops continuously, and its stop position under each instruction is measured. From the above-mentioned final measurement position, several minimum setting unit instructions are continued to be given in the same direction to make the moving part move and stop, and then several minimum setting unit instructions are given in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position. The stop position of the moving part under these positive and negative minimum setting unit instructions is not measured. Then, give instructions in the negative (or positive) direction for a total of 20 minimum setting units, continue to move the moving part continuously, stop, return to the reference position approximately, and measure its stop position under each instruction, see Figure 1. Note: It must be noted that sometimes the actual moving direction is not consistent with the instruction direction. Each linear motion axis must be tested at least in the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 9.2, and calculate the maximum error value at the three positions. 713
The stop position of several minimum setting unit command components
is not measured
Measurement garden
9.2 Error calculation method
9.2.1 Minimum setting unit error S
JB/T 9928. 2-1999
Actual moving distance
Assume the change of wind speed
Effective effect
Minimum setting unit
The minimum setting unit error is calculated by the maximum absolute value of the difference between the actual displacement and the theoretical value of a minimum setting unit command in each position test on each linear motion axis, as shown in formula (1). S,| L; m [max
Where: S. —Minimum setting unit error, mm; L, —---Actual displacement value of a certain minimum setting unit instruction (i=1 or 2, 3-...-20), mm, m
Theoretical value of a minimum setting unit instruction, mn. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in each position test on each linear motion axis as a percentage of the theoretical value of 20 minimum setting unit instructions, as shown in formula (2). 20m
Where: S—Minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S. should not be greater than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
(2)
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least at the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
Origin return error, calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the mean deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
It shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.33 Test of the main transmission system reaching maximum power 8.3.1 Select an appropriate speed within the spindle constant power speed range and conduct a cutting test. The cutting amount can be adjusted to make the main motor reach the rated power.
8.3.2 When the main motor reaches the maximum power for cutting, assess whether the various parts of the machine tool work normally and reliably. There should be no abnormal noise and vibration.
8.3.3 The cutting tool is an insert end mill. 8.3.4 The test piece material is 45 steel.
9 Minimum setting unit test of linear motion axis 9.1 Test method
First, use a fast speed to make the moving part on the linear motion axis move a certain distance in the positive (or negative) direction and then stop. Then give several minimum setting unit instructions in the same direction to make the moving part stop at a certain position, and use this position as the reference position. Then give one minimum setting unit instruction in the same direction each time, a total of 20 minimum setting unit instructions, so that the moving part moves and stops continuously, and measure its stop position under each instruction. From the above-mentioned final measurement position, continue to give instructions of several minimum setting units in the same direction to make the moving part move and stop, and then give instructions of several minimum setting units in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position approximately. The stop position of the moving part under these instructions of several minimum setting units in the positive and negative directions is not measured. Then, give instructions of 20 minimum setting units in the negative (or positive) direction each time, continue to make the moving part move continuously, stop, and return to the reference position approximately, and measure its stop position under each instruction, see Figure 1. Note: It must be noted that sometimes the actual moving direction is not consistent with the instruction direction. Each linear motion axis must be tested at least in the middle of the stroke and at three positions near both ends. Calculate the error according to the provisions of 9.2, and calculate the maximum error value at three positions. 713
The stop position of several minimum setting unit command components
is not measured
Measurement garden
9.2 Error calculation method
9.2.1 Minimum setting unit error S
JB/T 9928. 2-1999
Actual moving distance
Assume the change of wind speed
Effective effect
Minimum setting unit
The minimum setting unit error is calculated by the maximum absolute value of the difference between the actual displacement and the theoretical value of a minimum setting unit command in each position test on each linear motion axis, as shown in formula (1). S,| L; m [max
Where: S. —Minimum setting unit error, mm; L, —---Actual displacement value of a certain minimum setting unit instruction (i=1 or 2, 3-...-20), mm, m
Theoretical value of a minimum setting unit instruction, mn. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in each position test on each linear motion axis as a percentage of the theoretical value of 20 minimum setting unit instructions, as shown in formula (2). 20m
Where: S—Minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S. should not be greater than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
(2)
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least at the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
Origin return error, calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the mean deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
It shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.33 Test of the main transmission system reaching maximum power 8.3.1 Select an appropriate speed within the spindle constant power speed range and conduct a cutting test. The cutting amount can be adjusted to make the main motor reach the rated power.
8.3.2 When the main motor reaches the maximum power for cutting, assess whether the various parts of the machine tool work normally and reliably. There should be no abnormal noise and vibration.
8.3.3 The cutting tool is an insert end mill. 8.3.4 The test piece material is 45 steel.
9 Minimum setting unit test of linear motion axis 9.1 Test method
First, use a fast speed to make the moving part on the linear motion axis move a certain distance in the positive (or negative) direction and then stop. Then give several minimum setting unit instructions in the same direction to make the moving part stop at a certain position, and use this position as the reference position. Then give one minimum setting unit instruction in the same direction each time, a total of 20 minimum setting unit instructions, so that the moving part moves and stops continuously, and measure its stop position under each instruction. From the above-mentioned final measurement position, continue to give instructions of several minimum setting units in the same direction to make the moving part move and stop, and then give instructions of several minimum setting units in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position approximately. The stop position of the moving part under these instructions of several minimum setting units in the positive and negative directions is not measured. Then, give instructions of 20 minimum setting units in the negative (or positive) direction each time, continue to make the moving part move continuously, stop, and return to the reference position approximately, and measure its stop position under each instruction, see Figure 1. Note: It must be noted that sometimes the actual moving direction is not consistent with the instruction direction. Each linear motion axis must be tested at least in the middle of the stroke and at three positions near both ends. Calculate the error according to the provisions of 9.2, and calculate the maximum error value at three positions. 713
The stop position of several minimum setting unit command components
is not measured
Measurement garden
9.2 Error calculation method
9.2.1 Minimum setting unit error S
JB/T 9928. 2-1999
Actual moving distance
Assume the change of wind speed
Effective effect
Minimum setting unit
The minimum setting unit error is calculated by the maximum absolute value of the difference between the actual displacement and the theoretical value of a minimum setting unit command in each position test on each linear motion axis, as shown in formula (1). S,| L; m [max
Where: S. —Minimum setting unit error, mm; L, —---Actual displacement value of a certain minimum setting unit instruction (i=1 or 2, 3-...-20), mm, m
Theoretical value of a minimum setting unit instruction, mn. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in each position test on each linear motion axis as a percentage of the theoretical value of 20 minimum setting unit instructions, as shown in formula (2). 20m
Where: S—Minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S. should not be greater than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
(2)
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least at the middle of the stroke and at three positions near the two ends. Calculate the error according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
Origin return error, calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the mean deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
It shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.32 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of the 20 minimum setting unit instructions in each position test on each linear motion axis. The percentage of the theoretical value of the 20 minimum setting unit instructions is calculated as follows (2). 20m
Where: S—a minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
shall be specified by the manufacturer's enterprise standard. Recommended S. Not more than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
（2）
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least in the middle of the stroke and at three positions near both ends. The error is calculated according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
The origin return error is calculated as six times the maximum standard deviation value of the origin return deviation obtained by calculating in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—Standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the standard deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.32 Minimum setting unit relative error Sb
The minimum setting unit relative error is calculated as the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of the 20 minimum setting unit instructions in each position test on each linear motion axis. The percentage of the theoretical value of the 20 minimum setting unit instructions is calculated as follows (2). 20m
Where: S—a minimum setting unit relative error, 20m
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions (i-1 or 2, 3..20), mm. 9.3 Tolerance
shall be specified by the manufacturer's enterprise standard. Recommended S. Not more than five minimum setting units; S should not be greater than 25%. 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 714
（2）
10 Origin return test of linear motion axis
10.1 Test method
JB/T9928.2-1999
Make the moving parts on each linear motion axis return to a set origin P from the same direction five times quickly. Measure the difference between the actual return position Pi of the moving parts each time and the theoretical position of the origin, that is, the origin return deviation X (i1, 2, ..5), see Figure 2.
Each linear motion axis must be tested at least in the middle of the stroke and at three positions near both ends. The error is calculated according to the provisions of 10.2, and the maximum error value at the three positions is used as the calculation. X20
10.2 Error calculation method
The origin return error is calculated as six times the maximum standard deviation value of the origin return deviation obtained by calculating in at least three position tests on each linear motion axis, as shown in formula (3). R. = 6Somax
Where: R origin return error, mm,
S—Standard deviation of origin return deviation, mm. (3)
/F2(xx.), origin return deviation Xxs = Pa. -P., the standard deviation of origin return deviation refers to GB/T10931—1989, S. =
mean deviation X
10.3 Tolerance
shall be specified by the manufacturer's enterprise standard (it is recommended that R. should not be greater than 1/2 of the repeat positioning accuracy). 10.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 715
Precision inspection of machine tools
JB/T9928.2-1999
11.1Precision inspection is carried out in accordance with JB/T 9928.1. Temperature-related items (G2, G7, G8) are inspected when the spindle reaches a stable temperature at medium speed.
The position accuracy inspection of machine tools is carried out after the load test and before the working accuracy inspection. 11.2
The position accuracy error curve diagram should be attached to the machine tool qualification certificate. 11.3
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