A method for detecting and adjusting the precision of an M40-G spindle and a turning-milling unit

Abstract

The present application relates to a kind of M40-G main shaft, car milling unit precision detection and adjustment method, method includes the following steps: detecting the parallelism of Z1 axis, S2 secondary spindle and Z1 axis parallelism;S1 main shaft generatrix deviation and S1 main shaft and S2 secondary spindle coaxiality are detected;To main shaft S1 deviation, S1 main shaft and S2 secondary spindle coaxiality are adjusted, and deflection compensation is carried out;Using self-made T type detection tool, the perpendicularity of car milling unit X1 and Z1, the perpendicularity of Y1 and Z1 is detected;To car milling unit B1 axis generatrix detection and parameter compensation.This method is more reliable, can quickly detect the result, improve detection efficiency and carry out deflection compensation according to the size of common workpiece;Through this detection and adjustment method, systematic detection and adjustment are realized, and detection and adjustment can be quickly and accurately carried out, not only efficient and simple, and guarantee the high-precision machining of M40-G car milling compound machining center lays the stable foundation.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically relating to a method for precision detection and adjustment of an M40-G spindle and milling unit. Background Technology

[0002] In today's rapidly developing manufacturing industry, the M40-G turning-drilling-milling machining center plays an increasingly important role in the automotive engine manufacturing industry due to its powerful machining capabilities, high machining accuracy, and production efficiency. The M40-G turning-drilling-milling machining center encompasses nine control axes, including five linked axes, featuring a complex mechanical structure and high technological content. To improve product quality and production efficiency during collisions or prolonged heavy cutting, the spindle and turning / milling unit require regular mechanical accuracy checks and adjustments. Due to the machine tool's complexity and high precision, and the need to ensure the production of high-quality products, it is essential to improve the machining accuracy of the equipment and to perform rapid and accurate accuracy checks and adjustments on the M40-G.

[0003] In existing technologies, the methods used for precision testing and adjustment of M40-G turning-drilling-milling composite machining centers that have been in long-term use or subjected to impacts are as follows:

[0004] 1. The parallelism between the S2 sub-spindle and the Z1 axis is measured by mandrel at a certain point, resulting in a single measurement with low reliability; static testing of the spindle busbar cannot eliminate static and dynamic errors.

[0005] 2. The coaxiality of the main spindle and the sub-spindle is measured using a single dial indicator. All spindle adjustments are performed using a single dial indicator, which increases the error and testing time. This method cannot achieve rapid accuracy testing and does not take into account the deflection that occurs when machining long workpieces.

[0006] 3. When adjusting the generatrix and coaxiality of the spindle, it is impossible to make regular or blind adjustments, which is difficult and challenging.

[0007] 4. The perpendicularity of the X1, Y1 and Z1 axes of the milling and turning unit cannot be accurately measured. The B-axis accuracy measurement does not take into account the two states of B-axis locking and unlocking. If the deviation is exceeded, the existing adjustment method is to disassemble the B-axis for adjustment, which requires a lot of manpower and resources.

[0008] Existing testing methods lack systematic testing for multiple control axes and multiple linkage axes, ultimately leading to significant errors caused by the linkage of each axis during processing. This prevents the equipment from achieving high-precision processing, seriously affecting product quality and hindering the optimal operation of the equipment. Summary of the Invention

[0009] The purpose of this invention is to provide a method for precision detection and adjustment of M40-G spindle and milling unit, so as to solve the problems of precision deviation caused by long-term use of machine tools and the systematic detection and adjustment of mechanical precision after collision during machining, which can effectively improve equipment precision and produce high-precision products.

[0010] The objective of this invention is achieved through the following technical solution:

[0011] A method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit includes the following steps:

[0012] S1. Check the parallelism of the Z1 axis; S2. Check the parallelism between the secondary spindle 13 and the Z1 axis.

[0013] S2. Detect the deviation of the S1 main spindle generatrix and the coaxiality of the S1 main spindle 12 and the S2 secondary spindle 13;

[0014] S3. Adjust the deviation of the main spindle S1, the coaxiality of the main spindle 12 and the secondary spindle 13 of S2, and perform deflection compensation.

[0015] S4. Using a T-shaped inspection tool, inspect the perpendicularity between milling and turning units X1 and Z1, and the perpendicularity between Y1 and Z1.

[0016] S5. Detection and parameter compensation of the B1 axis generatrix of the milling and turning unit.

[0017] Further, step S1 specifically includes the following steps:

[0018] S11. Establish the Z1 axis as the reference axis for the inspection and adjustment of the M40-G milling and turning center, and inspect the parallelism of the Z1 axis: place a pointer level on the Z1 axis and move it 2000mm in both the forward and reverse directions multiple times. The measurement result should not be greater than 0.01mm.

[0019] S12. Check the parallelism between the S2 sub-spindle 13 and the Z1 axis: Fix the lever micrometer 1 on the S3 tool spindle, place the pointer on the S2 sub-spindle 13 and point the lever micrometer 1 pointer to zero, and record the first position data e1; move the S2 sub-spindle 13 400mm along the Z4 direction; move the S3 tool spindle of the milling and turning unit 400mm along the Z1 direction, and record the reading of the lever micrometer 1 as the second position data e2; move the S2 sub-spindle 13 another 400mm along the Z4 direction; move the S3 tool spindle of the milling and turning unit 400mm along the Z1 direction, and record the reading of the lever micrometer 1 as the second position data e3; measure e4 and e5 in the same way, and compare e1, e2, e3, e4, and e5. The detection accuracy e = emaximum - eminent.

[0020] In a further step S11, if the Z1 axis exceeds the tolerance during production, its guide rail and slider need to be adjusted by grinding.

[0021] Further, step S2 specifically includes the following steps:

[0022] S21. Using the Z1 axis as a reference, inspect the S1 main spindle generatrix and the coaxiality of the S1 main spindle 12 and the S2 secondary spindle 13.

[0023] S22. Perform S1 spindle busbar deviation detection;

[0024] S23. Perform coaxiality detection of S1 main spindle 12 and S2 sub-main spindle 13.

[0025] Furthermore, in step S22, the spindle generatrix deviation detection is specifically as follows: remove the spindle chuck of S1, install the mandrel 5HSK100, and fix the lever dial indicator on the tool spindle of S3; when the indicator needle touches the top of the mandrel, record the indicator needle reading; the spindle rotates forward at 8 rpm, and slowly moves Z1 from the near end 10 of the lever dial indicator to the far end 11 of the lever dial indicator, and calculates the deviation Dpositive; the spindle rotates backward at 8 rpm, and Z1 moves from the far end to the near end, and calculates the deviation Dreverse. Finally, the generatrix accuracy D = (Dpositive + Dreverse) / 2.

[0026] Furthermore, in step S23, the coaxiality detection of the S1 main spindle 12 and the S2 sub-spindle 13 is specifically as follows: After the spindle generatrix deviation measurement is completed, the chuck of the S2 sub-spindle 13 is removed, the mandrel HSK100 is installed, and two lever dial indicators 1 of the same model are fixed on the S3 tool spindle. First, the pointers of the two dial indicators 1 are brought into contact with the top of the left mandrel. Initially, the first lever dial indicator 1 is at the near end of the left mandrel, and the second lever dial indicator 1 is at the far end of the left mandrel. Then, the Z1 axis is slowly moved, and the two dial indicators move simultaneously until the lever dial indicator 2 moves onto the S2 sub-spindle 13 mandrel. The numerical changes P1 and P2 of the first lever dial indicator 1 and the second lever dial indicator 1 are read, and the coaxiality is P1 - P2.

[0027] Further, step S3 specifically includes the following steps: The S1 spindle 12 is fixed to the machine tool bed by 10 fixing bolts 8, 5 on each side, with upper bolts 6 and lower bolts 7 on each side, used for adjusting the S1 spindle generatrix deviation and the coaxiality of the S1 spindle and the S2 auxiliary spindle; a level 4 is placed at the fixing point of the S1 spindle 12, which reflects the adjustment amount when the upper bolts 6 and lower bolts 7 are adjusted. Each adjustment executes step S2 to generate a specific deviation value, which can be compared with the change in the level 4 after adjusting the upper bolts 6 and lower bolts 7, thus completing the adjustment of the S1 spindle generatrix deviation and the coaxiality adjustment of the S1 spindle 12 and the S2 auxiliary spindle 13; when adjusting the coaxiality, the S1 spindle 12 needs to be 0.015mm higher than the S2 auxiliary spindle 13.

[0028] Further, step S4 specifically includes the following steps: using a self-made T-shaped gauge to detect the perpendicularity of X1 and Z1, and the perpendicularity of Y1 and Z1. The self-made T-shaped gauge 9 is clamped on the S1 spindle 12, and the dial indicator I 14 is fixed on the S3 tool spindle. The S1 spindle 12 is at 0°. The X1-turning-drilling-milling unit moves from top to bottom to move the dial indicator on the detection surface of the T-shaped gauge to measure the perpendicularity of X1 and Z1. The S1 spindle 12 is rotated 90°, and the Y1-turning-drilling-milling unit moves back and forth to measure the perpendicularity of Y1 and Z1.

[0029] Further, step S5 specifically includes the following steps: clamping the 300mm long detection mandrel 15 on the B1 axis, swinging the B1 axis to the left-90° position, moving the pointer of the measuring micrometer II 16 to the surface of the mandrel and measuring the Z1 axis to check for deviation of the generatrix. The measured value can reflect whether the B1 axis is at -90°; after the measurement is completed, rotate the B1 axis to +90° and check the right position accuracy. After both the -90° and +90° measurement values ​​are passed, determine the overall deviation position of the B1 axis; by modifying the compensation system parameter 34090 at the left-90° position, the accuracy optimization is completed.

[0030] Furthermore, repeat the locking and unlocking operation of the B1 axis more than 5 times.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. Establish a reference axis for testing; the parallelism between the S2 sub-spindle and the Z1 axis is measured at multiple points, and the measurement results are calculated using formulas, making the test results more reliable;

[0033] 2. By rotating the spindle in both forward and reverse directions, the accuracy of the M40-G turning-drilling-milling composite machining center is checked. The spindle generatrix is ​​dynamically detected to measure the spindle deviation D (forward) and D (reverse). The deviation result is calculated using formulas to eliminate errors. When checking the coaxiality of the spindle and the sub-spindle, two lever dial indicators are used simultaneously for measurement. The deviation is accurately measured through algorithms, reducing the number of measurements, quickly obtaining results, improving detection efficiency, and performing deflection compensation according to the dimensions of commonly machined workpieces.

[0034] 3. When adjusting the spindle generatrix and coaxiality, place a level on the spindle base. Summarize the patterns based on the level's feedback to reduce the number of adjustments, improve equipment accuracy, and optimize product accuracy.

[0035] 4. Using self-made auxiliary inspection tools, the perpendicularity of the X1, Y1 and Z1 axes is detected. The B-axis is dynamically detected. The detection results are calculated using a calculation formula. Through B-axis parameter compensation, precise adjustments are made to maximize the equipment accuracy.

[0036] This testing and adjustment method enables systematic testing and adjustment, allowing for rapid and accurate testing and adjustment. It is not only efficient and simple but also lays a stable foundation for the high-precision machining of the M40-G milling and turning center. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the M40-G milling and turning machining center.

[0039] Figure 2 This is a schematic diagram of the parallelism test between the S2 sub-spindle and the Z1 axis;

[0040] Figure 3 , Figure 3-1 This is a schematic diagram of the S1 main spindle detection and the detection of the S1 main spindle and S2 sub-spindle;

[0041] Figure 4 , Figure 4-1 This is a schematic diagram of the S1 spindle adjustment position;

[0042] Figure 5 , Figure 5-1 This is a diagram illustrating the self-made T-shaped inspection tool and its usage.

[0043] Figure 6 This is a schematic diagram of the B1 axis detection in the milling and turning unit;

[0044] Figure 7 This is a schematic diagram of the testing and adjustment process.

[0045] In the diagram: 1. Lever dial indicator; 2. S2 sub-spindle; 3. Adjusting shim; 4. Level; 5. Mandrel; 6. Top bolt; 7. Pull-down bolt; 8. Fixing bolt; 9. Self-made gauge; 10. Proximal end of lever dial indicator; 11. Distal end of lever dial indicator; 12. S1 spindle; 13. S2 sub-spindle; 14. Dial indicator I; 15. Testing mandrel; 16. Dial indicator II. Detailed Implementation

[0046] The present invention will be further described below with reference to embodiments:

[0047] The present invention provides a method for accuracy detection and adjustment of the M40-G spindle and milling / turning unit, comprising the following steps:

[0048] 1. Check the parallelism of the Z1 axis and the parallelism between the S2 secondary spindle 13 and the Z1 axis;

[0049] 2. Detect the deviation of the S1 main spindle generatrix and the coaxiality of the S1 main spindle 12 and the S2 secondary spindle 13;

[0050] 3. Adjust the deviation of spindle S1, the coaxiality of spindle S1 12 and spindle S2 13, and perform deflection compensation;

[0051] 4. Use a self-made T-shaped inspection tool to inspect the perpendicularity of milling and turning units X1 and Z1, and Y1 and Z1.

[0052] 5. Detection and parameter compensation of the B1 axis generatrix of the milling and turning unit.

[0053] The components of each shaft are as follows Figure 1 As shown, the left spindle box includes: S1 - main spindle, C1 - rotary axis. The upper cross guide rails include: X1 - vertical movement of the turning, drilling, and milling unit, Z1 - horizontal movement of the turning, drilling, and milling unit. The turning, drilling, and milling unit includes: Y1 - forward and backward movement of the turning, drilling, and milling unit, B1 - left and right oscillation of the tool axis, S3 - tool spindle. The right spindle box includes: S2 - sub-spindle, C2 - rotary axis, Z4 - tailstock moves along the Z-direction. The center rest includes: Z2 - center rest moves along the Z-direction.

[0054] The present invention provides a method for accuracy detection and adjustment of the M40-G spindle and milling unit, specifically including the following steps:

[0055] S1. First, using the Z1 axis of the M40-G milling and turning machining center as the reference axis, the parallelism of the Z1 axis was checked. By placing a pointer level on the Z1 axis and moving it 2000mm in both the forward and reverse directions multiple times, the measurement result was no greater than 0.01mm. The possibility of this axis exceeding the tolerance in production is small; if it does exceed the tolerance, its guide rails and sliders need to be adjusted by grinding. Simultaneously, through... Figure 2 The parallelism between the S2 sub-spindle 13 and the Z1 axis is checked using the following method: The dial indicator 1 is fixed to the S3 tool spindle, and the indicator needle is placed on the S2 sub-spindle 13 until the reading is zero. The first position data, e1, is recorded. Then, the S2 sub-spindle 13 moves 400mm along the Z4 direction. Simultaneously, the S3 tool spindle of the milling unit moves 400mm along the Z1 direction. At this point, the reading of the dial indicator 1 is recorded as the second position data, e2. The S2 sub-spindle 13 then moves another 400mm along the Z4 direction. Simultaneously, the S3 tool spindle of the milling unit moves 400mm along the Z1 direction, and the reading of the dial indicator 1 is recorded as the second position data, e3. e4 and e5 are measured in the same way. The accuracy e is calculated as e = emaximum - eminimum.

[0056] The advantages of this step are: using the Z1 axis as the reference axis for accuracy testing ensures that the spindle accuracy is adjusted to the optimal level later; multi-point measurement improves measurement accuracy, and accurate measurement results are calculated using formulas.

[0057] S2. Using the Z1 axis as a reference, inspect the S1 main spindle generatrix and check the coaxiality of the S1 main spindle 12 and the S2 secondary spindle 13; the S1 main spindle generatrix deviation detection method is as follows: Figure 3 As shown. Remove the S1 spindle chuck, install the mandrel 5HSK100, and fix the lever micrometer on the S3 tool spindle. Simultaneously, the indicator needle touches directly above the mandrel; record the needle reading. Then, rotate the spindle forward at 8 rpm, slowly moving Z1 from the near end 10 to the far end 11 of the lever micrometer, calculating the deviation Dpositive. Similarly, rotate the spindle backward at 8 rpm, moving Z1 from the far end to the near end, calculating the deviation Dreverse. Finally, the generatrix accuracy D = (Dpositive + Dreverse) / 2. The coaxiality detection method for the S1 spindle 12 and the S2 sub-spindle 13 is as follows... Figure 3-1 As shown. After the spindle generatrix deviation measurement is completed, remove the S2 sub-spindle chuck, install the mandrel HSK100, and fix two lever dial indicators 1 of the same model on the S3 tool spindle. First, bring the pointers of the two dial indicators 1 into contact with the top of the left mandrel. Initially, the first lever dial indicator 1 is at the near end of the left mandrel, and the second lever dial indicator 1 is at the far end of the left mandrel. Then, slowly move the Z1 axis, and the two dial indicators will move simultaneously until lever dial indicator 2 moves onto the sub-spindle mandrel. Read the numerical changes P1 and P2 of the first lever dial indicator 1 and the second lever dial indicator 1. Coaxiality = P1 - P2.

[0058] S3 Figure 4 , Figure 4-1 This is a schematic diagram of the S1 spindle adjustment position. The S1 spindle 12 is fixed to the machine tool bed by 10 fixing bolts 8, 5 on each side, ensuring the stability of the spindle during machine tool processing. There are also top bolts 6 and pull-down bolts 7 on the left and right sides respectively, used for adjusting the S1 spindle generatrix deviation and the coaxiality of the S1 spindle and the S2 auxiliary circumference. During adjustment, as... Figure 4 As shown. A level 4 is placed at the fixed position of the S1 main spindle 12. The main function of the level 4 is to reflect the amount of adjustment when adjusting the upper bolt 6 and the lower bolt 7. Step S2 is executed once for each adjustment. After step S2 is completed, a specific deviation value will be generated. This value can be compared with the change in the level 4 after adjusting the upper bolt 6 and the lower bolt 7 to summarize the change pattern. By summarizing the change pattern, adjustments can be made quickly and accurately, and the adjustment of the generatrix deviation of the main spindle S1 and the coaxiality adjustment of the S1 main spindle 12 and the S2 sub-spindle 13 can be completed quickly. At the same time, based on the summary of daily production product accuracy inspection, when adjusting the coaxiality, the S1 main spindle 12 needs to be 0.015mm higher than the S2 sub-spindle 13. The purpose is to compensate for the deflection caused by the length of the workpiece during processing.

[0059] S4. Using a self-made T-shaped inspection tool, such as Figure 5 To test Figure 5-1 (a) Perpendicularity of X1 and Z1, (b) Perpendicularity of Y1 and Z1. Figure 5-1 In the middle (a), the device is viewed from the front. The self-made T-shaped gauge 9 is clamped on the S1 spindle 12. The dial indicator I 14 is fixed on the S3 tool spindle. The S1 spindle 12 is at 0°. The X1-turning-drilling-milling unit moves from top to bottom to move the dial indicator on the T-shaped gauge's inspection surface to measure the perpendicularity of (a) X1 and Z1. The S1 spindle 12 is rotated 90° and the Y1-turning-drilling-milling unit moves back and forth to measure the perpendicularity of (b) Y1 and Z1.

[0060] S5, such as Figure 6 As shown, Figure 1 The B1 axis, which swings left and right on the tool axis, plays a crucial role in the machining process. Deviation in the B1 axis can lead to workpiece deviations during drilling, milling, and turning. A 300mm long inspection mandrel 15 is clamped onto the B1 axis. When the B1 axis is swung to the left (-90°), it must be locked and then released repeatedly at least five times to release stress and ensure measurement accuracy. The pointer of the dial indicator II 16 is moved along the Z1 axis to check for deviations in the mandrel's position. The measured value indicates whether the B1 axis is at -90°. To ensure measurement accuracy, after measurement, the B1 axis is rotated to +90°, and the right-side position is checked for accuracy. Measurements at both -90° and +90° indicate the overall deviation position of the B1 axis. Accuracy optimization is achieved by modifying the compensation system parameter 34090 at the left (-90°) position. Because the B1 axis indexing and positioning device has high indexing accuracy, only the setting at position B1 = -90° is required.

[0061] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit, characterized in that, Includes the following steps: S1, check the parallelism of the Z1 axis; S2, check the parallelism of the secondary main axis (13) with the Z1 axis. S11. Establish the Z1 axis as the reference axis for inspection and adjustment of the M40-G milling and turning center, and inspect the parallelism of the Z1 axis: place a pointer level on the Z1 axis and move it 2000mm in both the forward and reverse directions multiple times. The measurement result should not be greater than 0.01mm. If the Z1 axis exceeds the tolerance during production, its guide rails and sliders need to be adjusted by grinding. S12. Check the parallelism between the S2 sub-spindle (13) and the Z1 axis: Fix the lever micrometer (1) on the S3 tool spindle, place the pointer on the S2 sub-spindle (13) and point the lever micrometer (1) to zero, and record the first position data e1; move the S2 sub-spindle (13) 400mm along the Z4 direction; move the S3 tool spindle of the milling unit 400mm along the Z1 direction, and record the second position data e2 of the lever micrometer (1) reading; move the S2 sub-spindle (13) 400mm along the Z4 direction again; move the S3 tool spindle of the milling unit 400mm along the Z1 direction, and record the second position data e3 of the lever micrometer (1) reading; measure e4 and e5 in the same way, compare e1, e2, e3, e4 and e5, and the detection accuracy e = e maximum - e minimum; S2, Detect the deviation of the S1 main spindle generatrix and the coaxiality of the S1 main spindle (12) and the S2 secondary spindle (13); S21. Using the Z1 axis as a reference, the S1 main spindle busbar is inspected, and the coaxiality of the S1 main spindle (12) and the S2 secondary spindle (13) is inspected. S22. Perform S1 spindle busbar deviation detection; S23. Perform coaxiality test on the S1 main spindle (12) and the S2 sub-main spindle (13); S3. Adjust the deviation of the main spindle S1, the coaxiality of the main spindle (12) and the secondary spindle (13) S2, and perform deflection compensation. S4. Using a T-shaped inspection tool, inspect the perpendicularity between milling and turning units X1 and Z1, and the perpendicularity between Y1 and Z1. S5. Detection and parameter compensation of the B1 axis generatrix of the milling and turning unit.

2. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 1, characterized in that, Step S22, spindle busbar deviation detection, specifically: remove the S1 spindle chuck, install the mandrel 5HSK100, and fix the lever dial indicator on the S3 tool spindle; the indicator needle touches the top of the mandrel, record the indicator needle reading, the spindle rotates forward at 8 rpm, and slowly moves Z1 from the near end (10) to the far end (11) of the lever dial indicator to calculate the deviation D positive; the spindle rotates backward at 8 rpm, and Z1 moves from the far end to the near end to calculate the deviation D negative. Finally, the busbar accuracy D = (D positive + D negative) / 2.

3. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 1, characterized in that, Step S23, the coaxiality of the S1 main spindle (12) and the S2 sub-main spindle (13) is checked. Specifically, after the main spindle generatrix deviation measurement is completed, the S2 sub-main spindle (13) chuck is removed, the mandrel HSK100 is installed, and two lever micrometers (1) of the same model are fixed on the S3 tool spindle. First, the pointers of the two lever micrometers (1) are brought into contact with the top of the left mandrel. At the beginning, the first lever micrometer (1) is at the near end of the left mandrel, and the second lever micrometer (1) is at the far end of the left mandrel. Then, the Z1 axis is moved slowly, and the two lever micrometers (1) move at the same time until the lever micrometers (1) are moved to the mandrel of the S2 sub-main spindle (13). The numerical change values ​​P1 and P2 of the first lever micrometer (1) and the second lever micrometer (1) are read. Coaxiality = P1 - P2.

4. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 1, characterized in that, Step S3 specifically includes the following steps: The S1 spindle (12) is fixed to the machine tool bed by 10 fixing bolts (8), 5 on each side, and there are top bolts (6) and pull-down bolts (7) on each side, which are used to adjust the S1 spindle generatrix deviation and the coaxiality of the S1 spindle (12) and the S2 sub-spindle (13); A level (4) is placed at the fixing point of the S1 spindle (12), which can reflect the amount of adjustment when the top bolts (6) and pull-down bolts (7) are adjusted. Each time the adjustment is performed, step S2 is executed to generate a specific deviation value, which can be compared with the change in the level (4) after the top bolts (6) and pull-down bolts (7) are adjusted, thus completing the adjustment of the S1 spindle generatrix deviation and the coaxiality adjustment of the S1 spindle (12) and the S2 sub-spindle (13); When adjusting the coaxiality, the S1 spindle (12) needs to be 0.015mm higher than the S2 sub-spindle (13).

5. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 1, characterized in that, Step S4 specifically includes the following steps: using a self-made T-shaped gauge to detect the perpendicularity of X1 and Z1, and the perpendicularity of Y1 and Z1. The self-made T-shaped gauge (9) is clamped on the S1 spindle (12), and the dial indicator I (14) is fixed on the S3 tool spindle. The S1 spindle (12) is at 0°. The X1-turning-drilling-milling unit moves from top to bottom to move the dial indicator on the T-shaped gauge detection surface to measure the perpendicularity of X1 and Z1. The S1 spindle (12) is rotated 90°, and the Y1-turning-drilling-milling unit moves back and forth to measure the perpendicularity of Y1 and Z1.

6. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 1, characterized in that, Step S5 specifically includes the following steps: clamp the 300mm long detection mandrel (15) on the B1 axis, swing the B1 axis to the left-90° position, move the pointer of the measuring micrometer II (16) to the surface of the mandrel and move the Z1 axis to measure whether there is a deviation in the generatrix. The measured value can reflect whether the B1 axis is -90°; after the measurement is completed, rotate the B1 axis to +90° and check the right position accuracy. If both the -90° and +90° measured values ​​are passed, determine the overall deviation position of the B1 axis; by modifying the compensation system parameter 34090 at the left-90° position, the accuracy optimization is completed.

7. The method for accuracy detection and adjustment of an M40-G spindle and milling / turning unit according to claim 6, characterized in that: Repeat the locking and unlocking operation on axis B1 at least 5 times.

Images