Some standard content:
JB/T 8801-1998
This standard is a concretization and supplement of GB9061-88 "General Technical Conditions for Metal Cutting Machine Tools", ZBnJ50008.1-88 "General Technical Conditions for Mechanical Processing Parts of Metal Cutting Machine Tools" and ZBnJ50008.3--88 "General Technical Conditions for Assembly of Metal Cutting Machine Tools" based on the structural characteristics and use requirements of machining centers. This standard is proposed and managed by the National Technical Committee for Metal Cutting Machine Tools Standardization. The drafting units of this standard are: Beijing Machine Tool Research Institute, Beijing Milling Machine Research Institute, Shenyang Boring and Drilling Machine Research Institute, Nantong Machine Tool Co., Ltd., Dahe Machine Tool Factory.
The main drafters of this standard are: Yin Rusheng, Zheng Huiyi, Cui Shujun. 683
1 Scope
Machinery Industry Standard of the People's Republic of China
Machining centres
Technical conditions
Machining centres-Specifications This standard specifies the requirements for the manufacture and acceptance of general precision machining centres. This standard applies to general precision machining centres with linear axis travel up to 2000mm. 2 Referenced standards
JB/T 8801-1998
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. GB7932—87 General technical requirements for pneumatic systems GB9061—88 General technical requirements for metal cutting machine tools GB/T3168—93 Graphic symbols for operating instructions of digitally controlled machine tools GB/T5226.1—1996 Industrial machinery and electrical equipment Part 1 General technical requirements GB/T 16769-1997
JB/T 8771. 1—1998
JB/T 8771.21998
JB/T 8771.4—1998
JB/T 8771.5—1998
JB/T 8771.7—1998
Method for measuring the sound pressure level of noise from metal cutting machine tools Inspection conditions for machining centres Part 1: Inspection conditions for geometric accuracy of horizontal and attached spindle head machine tools Inspection conditions for vertical machining centres
Machining centre
Inspection conditions for positioning accuracy and repeatability of linear and rotary axes
Machining centre
Machining centre
ZBJ50003—88 Metal cutting machine tools
ZBn J50 008.1—88
ZBn J50 008. 2--88
ZBn J50 008. 3—88
ZB J50 016—89
ISO 230-2:1997
3 General requirements
Test conditions Part 5: Test conditions for positioning accuracy and repeatability of workpiece holding pallets Part 7: Determination of accuracy and cleanliness of finish-machined test pieces
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
General technical conditions for machined parts
General technical conditions for welded parts
General technical conditions for assembly
Metal cutting machine tools
General technical conditions for hydraulic systems
General rules for machine tool inspection
Part 2: Determination of positioning accuracy and repeatability of coordinate axes of CNC machine tools When accepting machine tools according to this standard, the remaining relevant acceptance items in standards such as GB9061, ZBnJ50008.1, ZBnJ50008.3 that have not been concretized in this standard must be inspected at the same time. 4 Accessories and tools
4.1 The following accessories and tools should be supplied randomly: a) 1 set of shims;
Guohao Machinery Industry Bureau approved 684 on July 17, 1998
implemented on December 1, 1998
b) 1 set of special adjustment tools.
4.2 The following special accessories can be supplied according to the agreement: a) various cutting tools;
b) various tool holders and tool rods:
c) pull nails;
d) tool setting instrument;
e) peripheral equipment of the control system;
f) others.
5 Processing and assembly quality
JB/T 8801—1998
5.1 The bed, worktable, column, spindle box, slide seat, saddle, ram, etc. are important castings (weld parts) and should be aged after rough machining. If necessary, perform aging again after semi-finishing. 5.2 For the easily worn parts of the spindle, spindle sleeve, screw pair, cam and high-speed, heavy-loaded gears, etc., wear-resistant measures suitable for the service life should be taken.
5.3 The following guide rails are important guide rails and should be made of wear-resistant cast iron, steel inlay, plastic coating or high (medium) frequency induction quenching and other wear-resistant measures: a) workbench and saddle guide rails;
b) saddle and bed guide rails;
c) column (or column slide) and bed guide rails; d) ram and vertical slide guide rails;
e) vertical slide and column guide rails;
f) workbench and bed guide rails;
g) spindle box and column guide rails.
5.4 Important fixed joint surfaces should fit tightly and no insertion is allowed when checking with a 0.04mm feeler gauge after tightening. The depth of partial (1~~2 places) insertion is allowed: the width shall not exceed 5mm and the length shall not exceed 1/5 of the joint surface, but if it is not greater than 100mm, it will be counted as 1 place. The following joint surfaces shall be assessed according to the requirements of “important fixed joint surfaces”: a) Fixed joint surface of sliding guide plate; b) Fixed joint surface of column and bed;
c) Fixed joint surface of front and rear bed;
d) Fixed joint surface of column and column slide; e) Fixed joint surface of spindle box and spindle box slide. 5.5 Particularly important fixed joint surfaces shall be tightly fitted. In addition to the inspection by color coating method, no insertion shall be allowed when inspected with a 0.03mm feeler gauge before and after tightening (particularly important fixed joint surfaces perpendicular to the horizontal plane can be inspected after tightening). The depth of partial insertion (1 to 2 places) is allowed: no more than 5mm in width and no more than 1/5 of the joint surface in length, but if it is not greater than 100mm, it will be counted as 1 place. The following joint surfaces shall be assessed according to the requirements of “particularly important fixed joint surfaces”: a) Joint surface of ball screw bracket;
b) Fixed joint surface of ball screw nut seat; c) Fixed joint surface of end gear plate;
d) Joint surface of steel guide rail.
5.6 The following guide rail pairs shall be assessed according to the requirements of “sliding (rolling guide rails): a) Workbench and saddle guide rail pair;
b) Saddle and bed guide rail pair;
c) Column (or column slide) and bed guide rail pair; d) Ram and vertical slide guide rail pair;
e) Vertical slide and column guide rail pair;
f) Workbench and bed guide rail pair;
g) Spindle box and column guide rail pair.
JB/T 8801—1998
5.7 In addition to the coloring method, the surface of the sliding guide rail shall also be inspected with a 0.04mm feeler gauge. The insertion depth of the feeler gauge between the sliding surfaces of the guide rail, insert strip, and pressure plate end shall not exceed the provisions of Table 1. Table 1
Machine tool weight
Feeler gauge insertion depth
5.8 When the joint surface of the mating parts is inspected by the coloring method, the scraping points shall be uniform. According to the prescribed calculation area, the average number of contact points in each 25mm×25mm area shall not be less than the provisions of Table 2. Table 2
Sliding (rolling) guide rail
Each guide rail width
Transfer guide rail
Sliding surface of insert strip and pressure plate is particularly important Fixed joint surface>100
When the joint surface of the mating parts processed by mechanical processing is inspected by the coloring method, the contact shall be uniform. The contact index shall not be lower than the requirements of Table 3.
Sliding (rolling) guide rail
Over the entire length
Over the entire width
Over the entire length
Transferring guide rail
Over the entire width
Particularly important fixed joint surface
Over the entire length
Over the entire width
5.10 The joints of multiple sections of spliced steel guide rails shall have a gap of 0.02~~0.04mm. The misalignment of the guide rail surface at the joint shall comply with the requirements of 5.11 in ZBnJ50008.3~88. 5.11 After the steel guide rail is fired, it shall be inspected by flaw detection and shall not have cracks. 5.12 The plastic-coated and coated guide rails shall fit tightly to the substrate, and the bonding shall be firm and reliable, without gaps and bubbles; the contact with the matching guide rails shall be even and shall comply with relevant regulations. The edges of the guide rails should be chamfered and rounded. 5.13The base surface for rolling guide installation shall comply with the provisions of the design documents. After assembly, the movement shall be light, flexible and free of obstruction. 5.14The ball screw pair and CNC rotary table installed on each motion coordinate axis shall be operated multiple times after assembly, and their reverse clearance shall not be greater than the provisions of Table 4.
Reverse clearance of linear coordinates
0:03 mm
Reverse clearance of rotary coordinates
5.15The quality of welded parts and welded components shall comply with the provisions of ZBnJ50008.2. Important welded components shall be inspected by flaw detection and shall not have cracks.
5.16The disc springs used in the broaching mechanism and other important mechanisms shall be subjected to working pressure test after assembly and shall comply with the requirements of the drawings and technical documents Specification 686
.
JB/T8801--1998
5.17 The hydraulic system and pneumatic system of the machine tool shall comply with the provisions of ZBJ50016 and GB7932 respectively. 5.18 After assembly, the important pressure cylinder shall be subjected to a pressure holding test of not less than 0.5h at 150% of the system design pressure, and there shall be no leakage.
5.19 After assembly, the high-speed rotating spindle assembly shall be subjected to a dynamic balance test. 5.20 The cleanliness of the machine tool shall be inspected in accordance with the provisions of ZBJ50003. The spindle box, feed box, and lubrication system hydraulic box shall be inspected by weight, and the impurities and dirt limits shall be specified by the manufacturer in the enterprise standard. 5.21 The electrical system of the machine tool shall comply with the provisions of GB/T5226.1. 5.22 The visual symbols of the CNC operation indicators of the machine tool shall comply with the provisions of GB3168, and the digital lettering on the panel and the text symbols and signs representing the functions shall be clear and correct.
6 Dry-running test of machine tools
6.1 Dry-running test of machine tools
6.1.1 The main motion mechanism of the machine tool should start from the lowest speed and run in sequence. The running time of each speed level shall not be less than 2 minutes. The machine tool with stepless speed change can run at low, medium and high speeds. When running at the highest speed, the time shall not be less than 1 hour, so that the spindle bearing reaches a stable temperature, and the temperature and temperature rise are measured near the spindle centering bearing. The temperature should not exceed 60℃, and the temperature rise should not exceed 30℃. The operation should be smooth at each speed, and the working mechanism should be normal and reliable. 6.1.2 For the moving parts on the linear coordinates and rotary coordinates, the idling test shall be carried out at low, medium, high feed speeds and fast speeds respectively. The movement shall be balanced and reliable, with no vibration at high speed and no obvious creeping phenomenon at low speed. 6.1.3 Under idling conditions, the actual deviation of the spindle speed and feed rate of each level of the step transmission shall not exceed the value indicated on the plate by 2% to 10%; the actual deviation of the spindle speed and feed rate of the stepless transmission shall not exceed the value indicated on the plate by ±10%. 6.1.4 The idling power of the main transmission system of the machine tool (excluding the no-load power of the main motor) shall not exceed the provisions of the design documents. 6.1.5 The noise of the whole machine shall be measured in accordance with the provisions of GB/T16769, and the noise sound pressure level shall not exceed 83dB(A). 6.2 Machine tool function test
6.2.1 Manual function test
Operate the various parts of the machine tool manually or in CNC manual mode for testing. 6.2.1.1 The spindle shall be tested for locking, loosening and blowing for no less than 5 times in a row. The movement shall be flexible, reliable and accurate. 6.2.1.2 The spindle shall be tested for starting, stopping (including braking) and directional operation in forward and reverse directions for 10 times in a row at medium speed. The movement shall be flexible and reliable.
6.2:1.3 The spindle with continuously variable speed shall be at least within the range of low, medium and high speeds. The spindle with stepped speed shall be tested for speed change operation at each speed. The movement shall be flexible and reliable.
6.2.1.4 For the moving parts on each linear coordinate and rotary coordinate, the positive and negative start and stop operation tests shall be carried out for 10 times in a row at a medium feed speed. The positive and negative operation tests shall be carried out with appropriate incremental feed. The movement shall be flexible, reliable and accurate. 6.2.1.5 Carry out no less than 10 speed change operation tests on the feed system in the range of low, medium, high feed speed and fast speed. The action should be flexible and reliable.
6.2.1.6 Carry out 10 indexing and positioning tests on the indexing rotary table or CNC rotary table continuously. The action should be flexible, reliable and accurate.
6.2.1.7 Carry out 3 consecutive exchange tests on the pallet. The action should be flexible and reliable. 6.2.1.8 Carry out tool change test on the tool magazine and manipulator in any optional way. The tool configuration on the tool magazine should include the tools with the maximum weight, maximum length and maximum diameter specified in the design; the change action should be flexible, reliable and accurate; the load-bearing weight and tool change time of the manipulator should meet the design requirements.
6.2.1.9 Carry out idling test on various indicator lights, control buttons, paper tape readers, data input and output devices and fans of the machine tool digital control. The action should be flexible and reliable.
JB/T8801—1998
6.2.1.10 Carry out necessary tests on the safety insurance and protective devices of the machine tool. The functions must be reliable, and the movements should be flexible and accurate. 6.2.1.11 Test the hydraulic, lubrication and cooling systems of the machine tool. They should be sealed reliably, cooled sufficiently, lubricated well, and move flexibly and reliably; each system must not leak
6.2.1.12 Test the various auxiliary devices of the machine tool. The operation should be flexible and reliable. 6.2.2 CNC function test
Use CNC programs to operate various parts of the machine tool for testing. 6.2.2.1 Use medium speed to continuously test the spindle for 10 times of forward and reverse start, stop (including braking) and orientation. The movement should be flexible and reliable.
6.2.2.2 The continuously variable speed spindle shall be tested at least in the low, medium and high speed range, and the step-speed spindle shall be tested at each speed. The action shall be flexible and reliable.
6.2.2.3 For the moving parts on each linear coordinate and rotary coordinate, the positive and negative start, stop and incremental feed mode operation tests shall be carried out continuously at a medium feed speed. The action shall be flexible, reliable and accurate. 6.2.2.4 For the feed system, at least low, medium and high feed speeds and rapid speed change operation tests shall be carried out. The action shall be flexible and reliable. 6.2.2.5 For the indexing rotary table or CNC rotary table, the indexing and positioning tests shall be carried out continuously for 10 times. The action shall be flexible, and the operation shall be stable, reliable and accurate.
6.2.2.6 For various pallets, the exchange test shall be carried out 5 times. The action shall be flexible and reliable. 6.2.2.7 For each tool in the total capacity of the tool magazine, including the tool with the largest weight, the automatic tool change test shall be carried out at least 3 times in an optional manner. The action shall be flexible and reliable.
6.2.2.8 The coordinate linkage, coordinate selection, mechanical locking, positioning, various interpolations such as straight lines and arcs, various compensations such as pitch, clearance, and tools, various instructions such as program pause and emergency stop, the clamping and loosening of relevant parts and tools, and the start and stop of hydraulic, cooling, and pneumatic lubrication systems of the machine tool shall be tested one by one. Their functions shall be reliable and the actions shall be flexible and accurate. 6.3 Continuous idle operation test of machine tools
6.3.1 The continuous idle operation test shall be carried out after completing the tests in 6.2.1 and 6.2.2 and before the accuracy inspection. 6.3.2 The continuous idle operation test shall apply the CNC program including various main functions of the machine tool to operate the various parts of the machine tool for continuous idle operation. The time shall be not less than 48 hours.
6.3.3 During the whole process of continuous idle operation, the machine tool should operate normally, smoothly and reliably, and no failure should occur, otherwise it must be restarted.
6.3.4 The continuous idle operation program should include the following contents: a) The spindle speed should include more than 5 types of forward rotation, reverse rotation stop and positioning, including low, medium and high. The high-speed operation time is generally not less than 10% of the time used in each cycle program; b) The feed speed should combine the moving parts on each coordinate, including low, medium, high speed and fast positive and negative directions, and run within a nearly full range. And any point can be selected for positioning. The use of the override switch is not allowed during operation. The high-speed feed and fast running time shall not be less than 10% of the time used for each cycle program; c) The tools on each tool position in the tool magazine shall be automatically exchanged at least 2 times; d) The automatic indexing and positioning of the indexing rotary table or the CNC rotary table shall be not less than 2 cycles; e) Various pallets shall be automatically exchanged at least 5 times; f) The linkage operation of each linkage coordinate;
g) The pause time between each cycle program should not exceed 0.5min. 7 Load test of machine tools (performed according to the load test specifications compiled by the design) 7.1 The machine tool shall be subjected to the following load tests:
a) Operation test of the machine tool bearing the maximum weight of the workpiece (spot check); b) Test of the maximum torque of the machine tool main transmission system; 688
c) Test of the maximum cutting resistance of the machine tool (spot check); JB/T8801---1998
d) Test of the machine tool main transmission system reaching the maximum power (spot check). 7.2.2.1. Place a weight equivalent to the maximum weight of the workpiece as the workpiece on the workbench so that the load is evenly distributed. 7.2.2. Operate at the lowest and highest feed speeds and at high speeds. When operating at the lowest feed speed, the machine should generally move back and forth near the two ends and the middle of the stroke, and the moving distance each time should be no less than 20 mm. When operating at the highest feed speed and at high speed, the machine should move back and forth near the full stroke, and move back and forth once and five times respectively.
7.2.3. During the test, the machine tool should operate smoothly and reliably without obvious fat travel. 7.3.1. Select an appropriate spindle speed within the constant torque speed regulation range of the machine tool spindle, and conduct the test by milling or boring. Change the feed speed or cutting depth to make the machine tool main drive system reach the maximum torque specified in the design. 7.3.2. Cutting specimen material: HT200 or 45 steel; cutting tool: end mill or carbide boring tool. 7.3.3 During the test, the various elements, components and speed change mechanisms of the machine tool transmission system shall work normally and reliably, and the operation shall be smooth and accurate. 7.4 Test of the maximum cutting resistance of the machine tool
7.4.1 Select an appropriate spindle speed within the constant torque speed range of the machine tool spindle, and conduct the test by milling or boring. Change the feed speed or cutting depth to make the machine tool reach the maximum cutting resistance specified in the design. 7.4.2 Cutting specimen material: HT200;bZxz.net
Cutting tool: end mill or carbide milling cutter or high-speed steel twist drill. 7.4.3 During the test, the machine tool shall work normally, and each motion mechanism shall be flexible and reliable, and the overload protection device shall be normal and reliable. 7.5 Test of the main transmission system of the machine tool to reach the maximum power7.5.1 Within the constant power speed regulation range of the machine tool spindle, select an appropriate spindle speed, conduct the test by milling, and change the feed speed or cutting depth to make the machine tool reach the rated power of the main motor or the maximum power specified in the design. 7.5.2 Cutting specimen material: 45 steel;
Cutting tool: end mill.
7.5.3 During the test, all parts of the machine tool should work normally and reliably, without obvious frontal vibration, and record the metal removal rate, cm/min. 8. Small setting unit test
The minimum setting unit test of the machine tool has two types: linear coordinate minimum setting unit test and rotary coordinate minimum setting unit test. The test should be carried out separately. When testing a certain coordinate minimum setting unit, other moving parts should be placed in the middle of the stroke in principle. The test can be carried out under the conditions of using pitch compensation and clearance compensation. 8.1 Linear coordinate minimum setting unit test
8.1.1 Test method
First, quickly move the moving part on the linear coordinate 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 several 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. Test at least at the middle of the stroke and at three positions near both ends. Each linear coordinate should be tested. Note: 1) Pay attention to the actual moving direction. 689
Stop of the part under the minimum setting unit
Command
Position weight is not measured
Measurement range
8.1.2 Error calculation
JB/T8801—1998
Actual moving distance
Minimum setting unit
The error is divided into the minimum setting unit error and the minimum setting unit relative error. Calculate according to formula (1) and formula (2) respectively, and take the maximum error value at the three positions as the error of this item. 8.1.2.1 Minimum setting unit error
S, | L,—m lmax
Where: S.
Minimum setting unit error, mm
Actual displacement of a minimum setting unit command, mm, theoretical displacement of a minimum setting unit command, mm. Note: 1) 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
Where: S.—
Minimum setting unit relative error,
-the sum of the actual displacements of 20 minimum setting unit instructions, mm. 8.1.3 Tolerance
S: It shall be specified by the manufacturer in the enterprise standard according to the specific conditions of the machine tool. Sb: It shall not be greater than 25%.
8.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 8.2 Test of minimum setting unit of rotary coordinates
8.2.1 Test method
...(1)
First, quickly rotate the moving parts on the rotary coordinates to a certain angle in the positive (or negative) direction. After stopping, give several instructions of minimum setting units in the same direction, and then stop. Use this position as the reference position, give one instruction each time, and give a total of 20 instructions of minimum setting units. Rotate in the same direction by 1, and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of minimum setting units in the same direction. After stopping, give several instructions of minimum setting units in the negative (or positive) direction, and return to the above-mentioned final measurement position. The positions where these instructions of several minimum setting units in the positive and negative directions stop are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give a total of 20 minimum setting units, continue to rotate in the negative (or positive) direction, and measure the stop position of each instruction, as shown in Figure 2. The test should be carried out at least at any three positions within the rotation range. Each rotation coordinate is tested. Note: 1) Pay attention to the actual rotation direction. Actual rotation angle
Number of minimum setting units
Stop position of instruction component
Not measured
Measurement range
8.2.2 Error calculation
Minimum setting unit
The error is divided into the minimum setting unit angular displacement error and the minimum setting unit angular displacement relative error, which are calculated according to formula (3) and formula (4) respectively. The error takes the maximum error value at the three positions as the error of this item. 8.2.2.1 Minimum setting unit angular displacement error wg = | , mo I max
a minimum setting unit angular displacement error, \); where: —
actual angular displacement of a minimum setting unit instruction, (\); theoretical angular displacement of a minimum setting unit instruction, (\). Note: 1) If the direction of the actual angular displacement is opposite to the given direction, the angular displacement should be a negative value. 8.2.2.2 Minimum setting unit angular displacement relative error 20m
where:
minimum setting unit angular displacement relative error; 20mg
the sum of the actual angular displacements of 20 minimum setting unit instructions, (\). 8.2.3 Tolerance
u: According to the specific conditions of the machine tool, it shall be specified by the manufacturer in the enterprise standard. (3)
...( 4)
w: should not be greater than 25%.
8.2.4 Inspection tools
Autocollimator and polyhedron.
9 Origin return test
JB/T 8801-1998
Origin return test includes linear coordinate origin return test and rotary coordinate origin return test. They should be tested separately. When testing a certain coordinate, other moving parts should be placed in the middle of the stroke in principle. During the test, the test can be carried out under the condition of using pitch compensation and clearance devices.
9.1 Linear coordinate origin return test
9.1.1 Test method
The moving parts on the linear coordinates return to the origin P. at any point on the stroke in the same moving direction by five rapid tests. The deviation X (i=1,2,,5) between the actual position P. and the theoretical position P. of the origin is measured each time. See Figure 3.
The test should be carried out at least at the middle of the stroke and at three positions near the two ends. Each linear coordinate should be tested. Po
9.1.2 Error calculation
The maximum error value of the three positions is taken as the error of this item. R. = 4S.
Where: R. - origin return error, mm, So standard deviation when origin return, mm.
Note: Refer to the formula in ISO230-2:
XaX. )4
9.1.3 Tolerance
The tolerance shall be specified by the manufacturer in the enterprise standard according to the specific conditions of the machine tool. 9.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 692
(5)
9.2 Rotational coordinate origin return test
9.2.1 Inspection method
JB/T 8801—1998
The moving parts on the rotary coordinate are tested to return to the origin Poe five times in a fast rotation mode from any point on the stroke in the same rotation direction. Measure the deviation between the actual position P and the theoretical position Po of the origin each time, (i-12,,5), see Figure 4. The test shall be carried out at least at any three positions within the rotation range. Each rotary coordinate shall be tested. Poe
9.2.2 Error calculation
The error is the maximum error value at the three positions as the error of this item. Ra = 4San
Where: Roe—
Origin return error, (\);
SooStandard deviation when returning to the origin, (\). Note: Refer to the formula in ISO230-2:
9.2.3 Tolerance
(.0)
The tolerance shall be specified by the manufacturer in the enterprise standard according to the specific conditions of the machine tool. 9.2.4 Inspection tools
Self-propelling straightener and polyhedron.
10 Precision inspection of machine tools
10.1 The geometric accuracy inspection of machine tools shall be carried out in accordance with JB/T8771.1 for horizontal machining centers and JB/T8771.2 for vertical machining centers. The inspection of G11.G12, G13, G14 in JB/T 8771.1--1998 and G11, G12, G13, G14 in JB/T 8771.2 shall be carried out when the machine tool spindle reaches the medium speed stable temperature.
10.2 The positioning accuracy and repeat positioning accuracy of the linear and rotary axis of the machine tool shall be carried out in accordance with JB/T8771.4; the positioning accuracy and repeat positioning accuracy of the pallet shall be carried out in accordance with JB/T8771.5. Positioning accuracy and repeat positioning accuracy inspection shall be carried out after load test and before working accuracy inspection. 10.3. The precision of finishing test pieces of machine tools shall be carried out in accordance with JB/T8771.7: The cutting specifications of finishing test pieces shall be in accordance with the provisions of design documents; the precision of finishing test pieces shall be inspected and qualified in one time.
10.4 The maximum allowable value of the milling plane surface roughness R of the finishing test piece is 3.2μm, and the maximum allowable value of the boring hole surface roughness R is 1.6pm.
10.5 The machine tool qualification certificate shall be accompanied by the relevant data and charts of the machine tool position accuracy inspection. 11 Random technical documents
11.1 Two copies of the machine tool operating manual shall be randomly supplied. 11.2 The machine tool qualification certificate shall be accompanied by the positioning accuracy test data of the machine tool, and relevant charts shall be attached when the user requires. 694
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