JB/T 8648.2-1997 Technical requirements for drilling machining centers
Some standard content:
JB/T 8648.2--1997
This standard is formulated through the investigation of relevant domestic and foreign data and reference to relevant standards. In order to adapt to the needs of international trade, technical and economic exchanges and the leapfrog development of international standards as soon as possible. This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Boring and Drilling Machine Research Institute. The drafting units of this standard are: Beijing No. 3 Machine Tool Factory, Shanghai No. 5 Machine Tool Factory, Hubei Jingsha No. 1 Machine Tool Factory, Changzhou Machine Tool Factory, Dahe Machine Tool Factory. www.bzxz.net
1 Scope
Machinery Industry Standards of the People's Republic of China
Technical Conditions
Drilling Processing Center
This standard specifies the requirements for the manufacture and acceptance of drilling processing centers. JB/T 8648.2-1997
This standard is applicable to vertical and horizontal drilling processing centers with a maximum drilling diameter of no more than 40mm and a working surface width of 320~～500mm.
2 Cited 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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB9061--88 General technical conditions for metal cutting machine tools GB10931—89 Method for evaluating the position accuracy of digitally controlled machine tools ZBJ50003—88 Determination of cleanliness of metal cutting machine tools ZBnJ50008.1—88 General technical conditions for mechanical parts of metal cutting machine tools ZBnJ50008.2-88 General technical conditions for welded parts of metal cutting machine tools ZBnJ50008.3-—88 Metal cutting machine tools General technical conditions for assembly ZBJ50011-89 Technical conditions for painting of machine tools
JB/T3997—94#
General technical conditions for gray iron castings of machine tools
JB/T8648.1-1997 Precision inspection of drilling machining centers 3 General requirements
This standard is a concretization and supplement to GB9061, ZBmJ50008.1, ZBnJ50008.3 and other standards. When accepting machine tools according to this standard, other acceptance items in the above standards that are not concretized by this standard must be inspected at the same time. 4 Accessories and tools
4.1 Common tools or accessories such as loading and unloading, operation, adjustment, and lubrication should be supplied randomly to ensure normal use and maintenance by users. The types, specifications and quantities of tools and accessories should be determined according to the specific regulations of the manufacturer. 4.2 Special accessories for machine tools should be supplied according to user requirements and agreements. 5 Processing and assembly quality
5.1 The following castings are important castings and should be aged after rough machining. The mechanical properties, quality and brand of the castings should comply with the provisions of JB/T3997.
a) Bed;
b) Column;
c) Workbench;
d) Spindle box;
Approved by the Ministry of Machinery Industry of the People's Republic of China on August 18, 1997 and implemented on January 1, 1998
e) Slide;
f) Slide box;
g) Turret.
JB/T 8648.2—1997
5.2 Bed guide pair, column guide pair and slide guide pair are important guide pairs. When using sliding guide pairs, appropriate wear-resistant measures should be taken.
5.3 Welded parts and welded components shall comply with the provisions of ZBnJ50008.2. 5.4 The following joint surfaces shall be assessed according to the requirements of "important fixed joint surfaces": a) the joint surface between the column and the bed;
b) the joint surface of the sliding guide plate;
c) the joint surface between the spindle box and the spindle box slide; d) the joint surface between the bottom surface of the steel guide rail and the matching part. 5.5 The following joint surfaces shall be assessed in accordance with the requirements of "particularly important fixed joint surfaces": a) the joint surface between the ball screw nut seat and the mating part; b) the joint surface between the ball screw bearing seat and the mating part. 5.6 The ball screw pair installed on each linear motion coordinate axis shall be operated multiple times after assembly, and its reverse clearance shall not exceed 0.04mm. 5.7 The disc springs used in the broaching mechanism and other main mechanisms shall be subjected to working pressure tests according to the requirements specified in the drawings and technical documents after assembly.
5.8 The cleanliness of the machine tool shall be checked in accordance with the provisions of ZBJ50003 during idling or after the whole machine is inspected. It shall be specified by the manufacturer according to the specific conditions of the machine tool.
5.9 The painting of the machine tool shall be carried out in accordance with the provisions of ZBJ50011. 6 Air transportation of machine tools Rotation test
6.1 Dry running test of machine tool
6.1.1 The main motion mechanism of the machine tool is tested for dry running in sequence from the lowest speed to the highest speed (the continuously variable speed spindle should include the lowest and highest speeds, and should be no less than 12 speeds). The running time of each speed shall not be less than 2 minutes, and the running time of the highest speed shall not be less than 2 hours. The spindle bearings shall reach a stable temperature, and their temperature and temperature rise shall be checked near the bearings. The temperature shall not exceed 60°C, and the temperature rise shall not exceed 30°C. 6.1.2 The actual deviation of the spindle speed at each level shall not exceed -2% to +6% of the value indicated on the nameplate. 6.1.3 For the moving parts of the machine tool linear coordinates, dry running tests shall be carried out at low, medium, high feed speeds and fast speeds, and the feed speeds at each level shall be checked at the same time. The actual deviation of the speed should not exceed 5% to 3% of the indicated value on the sign; the moving parts should move smoothly and reliably without obvious creeping and vibration.
6.1.4 The idling power of the main transmission system shall be assessed in accordance with the design requirements. 6.2 Functional test of machine tools
6.2.1 Manual functional test
The manual functional test is a test performed by manually operating various parts of the machine tool (including buttons). 6.2.1.1 When the spindle is at medium speed, perform 10 consecutive forward and reverse start, stop (including braking) and directional operation tests. The action should be smooth and reliable.
6.2.1.2 Perform the tool locking, tool loosening and air blowing action tests on the spindle for no less than 5 times. The action should be smooth and reliable. 6. 2.1.3 For the low, medium and high speeds of the continuously variable speed spindle and for each speed of the step-speed spindle, the speed change test shall be carried out, and the action shall be flexible and reliable.
6.2.1.4 For the moving parts on each linear coordinate, the start and stop operation test shall be carried out 10 times in each direction at the medium feed speed, and the operation test in the positive and negative directions shall be carried out by selecting the appropriate incremental feed, and the action shall be smooth, reliable and accurate. 6.2.1.5 For the 10 speed change operation tests including the low, medium, high feed speed and fast speed of the feed system, the action shall be smooth and reliable. 6.2.1.6 For the tool magazine, the tool change test shall be carried out in an optional way, and the tool change action shall be smooth, reliable and accurate. The tool change time shall comply with the design requirements. 466
JB/T 8648.2—1997
6.2.1.7 For the various indicator lights, control buttons and fans of the machine tool digital control, the functions shall be accurate and reliable. 6.2.1.8 Test the hydraulic and pneumatic devices of the machine tool. The operation should be smooth and the function should be reliable. 6.2.1,9 Test the auxiliary devices of the machine tool. The operation should be reliable. 6.2.2 Automatic function test (can be combined with 6.3 continuous idle operation test) The automatic function test is a test performed by operating various parts of the machine tool using a CNC program. 6.2.2.1 When the spindle is at medium speed, 10 consecutive positive and reverse start, stop (including braking) and orientation operation tests should be performed. The operation should be smooth and reliable.
6.2.2.2 For the low, medium and high speeds of the continuously variable speed spindle and the various speeds of the stepped speed spindle, the speed change operation test should be performed. The operation should be smooth and reliable.
6.2.2.3 For the moving parts on each linear coordinate, the operation test of starting, stopping and incremental feeding in the positive and negative directions at medium feed speed should be performed continuously. The operation should be smooth, reliable and accurate. 6.2.2.4 For the low, medium and high feed speed and fast speed change operation tests of the feed system, the action should be flexible and reliable. 6.2.2.5 For each tool in the total capacity of the tool magazine (which should include the tools with the maximum weight specified in the design), the automatic tool change test shall be carried out at least twice in an optional manner, and the action shall be smooth, reliable and accurate. 6.2.2.6 Test the coordinate linkage and positioning functions of the machine tool, and its functions shall be reliable. 6.3 Continuous idle operation test of machine tool
Continuous idle operation test is a non-cutting continuous idle operation test of operating various parts of the machine tool using a CNC program including various main processing functions of the machine tool after the tests described in 6.1 to 6.2 and before the accuracy inspection. 6.3.1 The continuous idle operation time of the whole machine is 36 hours. 6.3.2 During the entire process of continuous idle operation, the machine tool should operate normally, smoothly and reliably, and no failure should occur, otherwise it should be restarted. 6.3.3 The continuous idle operation program should include the following contents: a) The spindle includes low, medium and high speed positive and negative operation and positioning, among which the high-speed operation time is generally not less than 10% of the time used for each cycle program; b) The moving parts on each coordinate should include low, medium and high feed speeds and fast positive and negative operation. The operation should be within the range of nearly full stroke, and any point can be selected for positioning. The use of the ratio switch is not allowed during operation. The high feed speed and fast operation time are generally not less than 10% of the time used for each cycle program; c) The force tools on each force position in the tool magazine are automatically exchanged at least twice: d) The linkage of each linkage coordinate; e) Various other CNC functions of the machine tool; f) The pause time between each cycle program shall not exceed 0.5min. 7 Load test of machine tools
The machine tools shall be subjected to the following load tests:
a) Operation test with the maximum weight of the workpiece (spot check); b) Maximum torque test of the main transmission system;
c) Maximum cutting resistance test;
d) Test of the main transmission system reaching maximum power (spot check). 7.1 Operation test with the maximum weight of the workpiece 7.1.1 A weight equivalent to the maximum weight of the workpiece specified in the design can be placed on the workbench as a workpiece to make its load evenly balanced. 7.1.2 The Z coordinate axis runs at the lowest and highest feed speeds and the rapid operation of each linear coordinate axis. When running at the lowest feed speed. Generally, it should be reciprocated near the two ends and the middle of the stroke, and the moving distance each time should be not less than 20mm; when running at the highest feed speed and rapid operation, it should be carried out on the full stroke, and reciprocated 5 times respectively. 7.1.3 The operation should be stable and reliable, and there should be no obvious creeping phenomenon when running at low speed. 467
7.2 Maximum torque test of main transmission system
JB/T 8648.2—1997
7.2.1 Select an appropriate spindle speed within the speed regulation range of the spindle constant torque and conduct the test by drilling. Adjust the cutting amount so that the spindle transmission system reaches the maximum torque specified in the design. 7.2.2 When conducting the maximum torque cutting test of the main transmission system, the machine tool should work normally and smoothly, and the parts, components and speed change mechanism of each transmission system should be normal and reliable.
7.2.3 The cutting tool used for the test is a standard high-speed steel twist drill. 7.2.4 The test piece is a cast iron part.
7.3 Maximum cutting resistance test
7.3.1 Select an appropriate spindle speed within the range less than or equal to the calculated speed of the machine tool, adopt the drilling method, and adjust the cutting amount so that the machine tool reaches the maximum cutting resistance specified in the design. 7.3.2 During the maximum cutting resistance test, the machine tool should work normally, and all motion mechanisms should be stable and reliable. The overload safety device should be normal and reliable.
7.3.3 The cutting tool used in the test is a standard high-speed steel twist drill. 7.3.4 The test piece is made of steel or cast iron.
7.4 The test of the main transmission system reaching maximum power 7.4.1 Within the spindle constant power speed regulation range, select an appropriate spindle speed, use the drilling method to conduct the test, and adjust the cutting amount to make the machine tool reach the maximum power (referring to the rated power of the main motor of the machine tool). 7.4.2 During the cutting test when the main motor reaches the maximum power, all parts of the machine tool should work normally without obvious vibration. 7.4.3 The cutting tool used in the test is a high-speed steel twist drill. 7.4.4 The test piece is made of cast iron.
7.5 When the requirements of the maximum cutting resistance test and the main transmission system maximum torque test are met at the same time, the two tests can be combined. 8 Minimum setting unit test
8.1 Minimum setting unit test for linear coordinates
8.1.1 Test method
First, quickly move the moving parts on the linear coordinates to a certain distance in the positive (or negative) direction. After stopping, give several instructions of the minimum setting units in the same direction, and then stop again. Use this position as the reference position, give one instruction at a time, and give a total of 20 instructions of the minimum setting units. Move in the same direction and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting units in the same direction. After stopping, give several instructions of the 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 the 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, and give 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. Actual moving distance
Several minimum setting unit instructions
The stop position is not measured
Minimum setting unit
JB/T8648.2—1997
Each linear coordinate must be tested at least at the middle and two ends of the stroke. Calculate the error as specified in 8.1.2, and take the maximum error value at the three positions as the error of this item. Note: Pay attention to the direction of actual movement.
8.1.2 Error calculation method
8.1.2.1 Minimum setting unit error S
S.=[L,一m Imax
Where: L,
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. 8.1.2.2 Minimum setting unit relative error Sb20mlm
Where:
8.1.3 Tolerance
× 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, it shall be specified by the manufacturer in the enterprise standard; S, shall not exceed 25%. 8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Linear coordinate origin return test
9.1.1 Test method
. (1)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed 5 times 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 P. of the origin each time, see Figure 2. P
Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near the two ends, and the error shall be calculated according to the provisions of 9.1.2. The maximum error value at the three positions shall be taken as the error of this item. 9.12 Error calculation method
The maximum value of 6 times the standard deviation in the origin return test in each linear coordinate is the origin return error. That is: R. = 6S.
Where: R. is the origin return error, mm; S. is the standard deviation when the origin returns, mm. Note: S. is calculated according to the relevant formula of GB10931. (3)
9.1.3 Adding difference
JB/T8648.2—1997
It shall be specified by the manufacturer according to the specific conditions of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10
Precision test of machine tools
Precision test of machine tools shall be carried out in accordance with the provisions of JB/T8648.1. 10.2
The test of G4, G5 and G6 in the precision standard shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 3 During the working precision test, the surface roughness Ra of the test piece is 3.2μm. 10.32Z coordinate axis runs at the lowest and highest feed speeds and the fast running of each linear coordinate axis. When running at the lowest feed speed. Generally, it should be reciprocated near the two ends and the middle of the stroke, and the moving distance each time should be not less than 20mm; when running at the highest feed speed and fast, it should be carried out on the full stroke, and reciprocated 5 times respectively. 7.1.3 It should be stable and reliable when running, and there should be no obvious creeping phenomenon when running at low speed. 467
7.2 Maximum torque test of main transmission system
JB/T 8648.2—1997
7.2.1 Within the speed regulation range of the spindle constant torque, select an appropriate spindle speed and use drilling method to conduct the test. Adjust the cutting amount so that the spindle transmission system reaches the maximum torque specified in the design. 7.2.2 When conducting the maximum torque cutting test of the main transmission system, the machine tool should work normally and smoothly, and the parts, components and speed change mechanisms of each transmission system should be normal and reliable.
7.2.3 The cutting tool for the test is a standard high-speed steel twist drill. 7.2.4 The test piece is a cast iron.
7.3 Maximum cutting resistance test
7.3.1 Select an appropriate spindle speed within the range of less than or equal to the calculated speed of the machine tool, use drilling method, adjust the cutting amount, so that the machine tool reaches the maximum cutting resistance specified in the design. 7.3.2 When conducting the maximum cutting resistance test, the machine tool should work normally, and each motion mechanism should be stable and reliable. The overload safety device should be normal and reliable.
7.3.3 The cutting tool for the test is a standard high-speed steel twist drill. 7.3.4 The test piece is a steel or cast iron part.
7.4 The test of the main transmission system reaching maximum power7.4.1 In the spindle constant power speed regulation range, select an appropriate spindle speed, use drilling method to conduct the test, and adjust the cutting amount to make the machine tool reach the maximum power (referring to the rated power of the main motor of the machine tool). 7.4.2 During the cutting test when the main motor reaches the maximum power, all parts of the machine tool should work normally without obvious vibration. 7.4.3 The cutting tool used in the test is a high-speed steel twist drill. 7.4.4 The test piece is a cast iron piece.
7.5 When the requirements of the maximum cutting resistance test and the maximum torque test of the main transmission system are met at the same time, the two tests can be combined. 8 Minimum setting unit test
8.1 Linear coordinate minimum setting unit test
8.1.1 Test method
First, quickly move the moving parts on the linear coordinates 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, and give a total of 20 instructions of the minimum setting unit. Continue to move in the negative (or positive) direction and measure the stop position of each instruction, as shown in Figure 1. Actual moving distance
Several minimum setting unit instructions
Stop position is not measured
Minimum setting unit
JB/T8648.2—1997
Each linear coordinate must be tested at least at the middle and two ends of the stroke. According to the calculation error specified in 8.1.2, the maximum error value at the three positions is taken as the error of this item. Note: Pay attention to the actual moving direction.
8.1.2 Error calculation method
8.1.2.1 Minimum setting unit error S
S.=[L,一m Imax
Where: L,
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. 8.1.2.2 Minimum setting unit relative error Sb20mlm
Where:
8.1.3 Tolerance
× 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, the manufacturer shall specify it in the enterprise standard; S, shall not exceed 25%. 8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Linear coordinate origin return test
9.1.1 Test method
. (1)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed five 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. P
Each linear coordinate is tested at least at any three positions in the middle and near the two ends of the stroke, and the error is calculated according to the provisions of 9.1.2. The maximum error value at the three positions is taken as the error of this item. 9.12 Error calculation method
The maximum value of 6 times the standard deviation during the origin return test in each linear coordinate is the origin return error. That is: R. = 6S.
Where: R. is the origin return error, mm; S. is the standard deviation during the origin return, mm. Note: S. Calculate according to the relevant formula of GB10931. (3)
9.1.3 Filling difference
JB/T8648.2—1997
The manufacturer shall specify it according to the specific situation of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10
Precision inspection of machine tools
Precision inspection of machine tools shall be carried out in accordance with the provisions of JB/T8648.1. 10.2
The inspection of G4, G5 and G6 in the precision standard shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 3 During the working precision inspection, the surface roughness Ra of the test piece is 3.2μm. 10.32Z coordinate axis runs at the lowest and highest feed speeds and the fast running of each linear coordinate axis. When running at the lowest feed speed. Generally, it should be reciprocated near the two ends and the middle of the stroke, and the moving distance each time should be not less than 20mm; when running at the highest feed speed and fast, it should be carried out on the full stroke, and reciprocated 5 times respectively. 7.1.3 It should be stable and reliable when running, and there should be no obvious creeping phenomenon when running at low speed. 467
7.2 Maximum torque test of main transmission system
JB/T 8648.2—1997
7.2.1 Within the speed regulation range of the spindle constant torque, select an appropriate spindle speed and use drilling method to conduct the test. Adjust the cutting amount so that the spindle transmission system reaches the maximum torque specified in the design. 7.2.2 When conducting the maximum torque cutting test of the main transmission system, the machine tool should work normally and smoothly, and the parts, components and speed change mechanisms of each transmission system should be normal and reliable.
7.2.3 The cutting tool for the test is a standard high-speed steel twist drill. 7.2.4 The test piece is a cast iron.
7.3 Maximum cutting resistance test
7.3.1 Select an appropriate spindle speed within the range of less than or equal to the calculated speed of the machine tool, use drilling method, adjust the cutting amount, so that the machine tool reaches the maximum cutting resistance specified in the design. 7.3.2 When conducting the maximum cutting resistance test, the machine tool should work normally, and each motion mechanism should be stable and reliable. The overload safety device should be normal and reliable.
7.3.3 The cutting tool for the test is a standard high-speed steel twist drill. 7.3.4 The test piece is a steel or cast iron part.
7.4 The test of the main transmission system reaching maximum power7.4.1 In the spindle constant power speed regulation range, select an appropriate spindle speed, use drilling method to conduct the test, and adjust the cutting amount to make the machine tool reach the maximum power (referring to the rated power of the main motor of the machine tool). 7.4.2 During the cutting test when the main motor reaches the maximum power, all parts of the machine tool should work normally without obvious vibration. 7.4.3 The cutting tool used in the test is a high-speed steel twist drill. 7.4.4 The test piece is a cast iron piece.
7.5 When the requirements of the maximum cutting resistance test and the maximum torque test of the main transmission system are met at the same time, the two tests can be combined. 8 Minimum setting unit test
8.1 Linear coordinate minimum setting unit test
8.1.1 Test method
First, quickly move the moving parts on the linear coordinates 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, and give a total of 20 instructions of the minimum setting unit. Continue to move in the negative (or positive) direction and measure the stop position of each instruction, as shown in Figure 1. Actual moving distance
Several minimum setting unit instructions
Stop position is not measured
Minimum setting unit
JB/T8648.2—1997
Each linear coordinate must be tested at least at the middle and two ends of the stroke. According to the calculation error specified in 8.1.2, the maximum error value at the three positions is taken as the error of this item. Note: Pay attention to the actual moving direction.
8.1.2 Error calculation method
8.1.2.1 Minimum setting unit error S
S.=[L,一m Imax
Where: L,
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. 8.1.2.2 Minimum setting unit relative error Sb20mlm
Where:
8.1.3 Tolerance
× 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, the manufacturer shall specify it in the enterprise standard; S, shall not exceed 25%. 8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Linear coordinate origin return test
9.1.1 Test method
. (1)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed five 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. P
Each linear coordinate is tested at least at any three positions in the middle and near the two ends of the stroke, and the error is calculated according to the provisions of 9.1.2. The maximum error value at the three positions is taken as the error of this item. 9.12 Error calculation method
The maximum value of 6 times the standard deviation during the origin return test in each linear coordinate is the origin return error. That is: R. = 6S.
Where: R. is the origin return error, mm; S. is the standard deviation during the origin return, mm. Note: S. Calculate according to the relevant formula of GB10931. (3)
9.1.3 Filling difference
JB/T8648.2—1997
The manufacturer shall specify it according to the specific situation of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10
Precision inspection of machine tools
Precision inspection of machine tools shall be carried out in accordance with the provisions of JB/T8648.1. 10.2
The inspection of G4, G5 and G6 in the precision standard shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 3 During the working precision inspection, the surface roughness Ra of the test piece is 3.2μm. 10.31 Test method
First, quickly move the moving parts on the linear coordinates to a certain distance in the positive (or negative) direction. After stopping, give several instructions of the minimum setting unit in the same direction, and then stop. Use this position as the reference position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Move in the same direction and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting unit in the same direction. After stopping, give several instructions of the minimum setting unit in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these instructions of the minimum setting unit in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Continue to move in the negative (or positive) direction and measure the stop position of each instruction, see Figure 1. Actual moving distance
Several minimum setting unit instructions
The stop position is not measured
Minimum setting unit
JB/T8648.2—1997
Each linear coordinate must be tested at least at the middle and two ends of the stroke. Calculate the error as specified in 8.1.2, and take the maximum error value at the three positions as the error of this item. Note: Pay attention to the direction of actual movement.
8.1.2 Error calculation method
8.1.2.1 Minimum setting unit error S
S.=[L,一m Imax
Where: L,
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. 8.1.2.2 Minimum setting unit relative error Sb20mlm
Where:
8.1.3 Tolerance
× 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, it shall be specified by the manufacturer in the enterprise standard; S, shall not exceed 25%. 8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Linear coordinate origin return test
9.1.1 Test method
. (1)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed 5 times 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 P. of the origin each time, see Figure 2. P
Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near the two ends, and the error shall be calculated according to the provisions of 9.1.2. The maximum error value at the three positions shall be taken as the error of this item. 9.12 Error calculation method
The maximum value of 6 times the standard deviation in the origin return test in each linear coordinate is the origin return error. That is: R. = 6S.
Where: R. is the origin return error, mm; S. is the standard deviation when the origin returns, mm. Note: S. is calculated according to the relevant formula of GB10931. (3)
9.1.3 Adding difference
JB/T8648.2—1997
It shall be specified by the manufacturer according to the specific conditions of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10
Precision test of machine tools
Precision test of machine tools shall be carried out in accordance with the provisions of JB/T8648.1. 10.2
The test of G4, G5 and G6 in the precision standard shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 3 During the working precision test, the surface roughness Ra of the test piece is 3.2μm. 10.31 Test method
First, quickly move the moving parts on the linear coordinates to a certain distance in the positive (or negative) direction. After stopping, give several instructions of the minimum setting unit in the same direction, and then stop. Use this position as the reference position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Move in the same direction and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting unit in the same direction. After stopping, give several instructions of the minimum setting unit in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these instructions of the minimum setting unit in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Continue to move in the negative (or positive) direction and measure the stop position of each instruction, see Figure 1. Actual moving distance
Several minimum setting unit instructions
The stop position is not measured
Minimum setting unit
JB/T8648.2—1997
Each linear coordinate must be tested at least in the middle and at both ends of the stroke. Calculate the error as specified in 8.1.2, and take the maximum error value at the three positions as the error of this item. Note: Pay attention to the direction of actual movement.
8.1.2 Error calculation method
8.1.2.1 Minimum setting unit error S
S.=[L,一m Imax
Where: L,
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. 8.1.2.2 Minimum setting unit relative error Sb20mlm
Where:
8.1.3 Tolerance
× 100%
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, it shall be specified by the manufacturer in the enterprise standard; S, shall not exceed 25%. 8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9 Origin return test
9.1 Linear coordinate origin return test
9.1.1 Test method
. (1)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed 5 times 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 P. of the origin each time, see Figure 2. P
Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near the two ends, and the error shall be calculated according to the provisions of 9.1.2. The maximum error value at the three positions shall be taken as the error of this item. 9.12 Error calculation method
The maximum value of 6 times the standard deviation in the origin return test in each linear coordinate is the origin return error. That is: R. = 6S.
Where: R. is the origin return error, mm; S. is the standard deviation when the origin returns, mm. Note: S. is calculated according to the relevant formula of GB10931. (3)
9.1.3 Adding difference
JB/T8648.2—1997
It shall be specified by the manufacturer according to the specific conditions of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10
Precision test of machine tools
Precision test of machine tools shall be carried out in accordance with the provisions of JB/T8648.1. 10.2
The test of G4, G5 and G6 in the precision standard shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 3 During the working precision test, the surface roughness Ra of the test piece is 3.2μm. 10.3
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