Grinding device and grinding method for locking friction plate of rotary shaft of numerical control machine tool

Abstract

This invention discloses a grinding device and method for a CNC machine tool rotary axis locking friction plate. The grinding device includes a base, a positioning guide frame, a connecting shaft, a thickness measuring device, a radial positioning device, a pressure block, a set screw, and a pressure cap. The positioning guide frame can rotate 90° around the connecting shaft. The thickness measuring device is used for thickness detection and scale calibration during the grinding process. The radial positioning device achieves concentric positioning of the friction plate and the intermediate pad. The grinding method first calculates the target size of the second friction plate with inner and outer steps based on the clearance accuracy requirements and the thickness of the intermediate pad. Then, the radial positioning device is used for centering, and the thickness measuring device is used for calibration and thickness measurement. The friction plate step surface is precisely ground once according to the set grinding amount, and the results are monitored in real time. This invention transforms the clearance control of multiple components into the dimensional grinding of a single friction plate, significantly shortening the assembly and adjustment cycle, improving clearance accuracy and batch consistency, and meeting the high-precision and high-efficiency braking component processing requirements of CNC machine tools.

Description

Technical Field

[0001] This invention belongs to the field of CNC machine tool rotary axis braking technology, and particularly relates to a grinding device and grinding method for CNC machine tool rotary axis locking friction plate. Background Technology

[0002] Braking control of the rotary axes of CNC machine tools typically employs a friction plate locking structure. This relies on the axial movement of a plunger to drive the friction plates into contact, generating frictional torque to achieve precise braking of the rotary axis. Figure 1 As shown, when the machine tool's rotating axis rotates to a specified angle, the piston 100 moves axially, pushing the first friction plate 200, the third friction plate 300 and the second friction plate 400 to fit tightly together axially, and completing the braking and locking operation through frictional torque; Because CNC machine tools have extremely high requirements for braking precision, the gap between the friction plates must meet stringent standards to ensure the stability and effectiveness of the rotary axis locking brake: if the gap is too large, it will reduce the feedback sensitivity of the high-precision braking of the CNC machine tool and affect the braking precision; if the gap is too small, the friction plates will make accidental contact during the operation of the machine tool, which will increase the load on the equipment and generate problems such as noise and vibration. In severe cases, it will damage the braking components and affect the service life of the machine tool. Currently, the traditional method for adjusting the gap between friction plates is to use a step-by-step assembly, step-by-step inspection, and grinding process. The specific process is as follows: after assembling the friction plates and shims step by step, the gap between the friction plates is checked with a feeler gauge, and then the friction plates and shims are ground and corrected according to the inspection results. Specifically, the gap between the first friction plate 200 and the second friction plate 400 is adjusted by the shim 500 and the second friction plate 400, and the gap between the third friction plate 300 and the second friction plate 400 is adjusted by the intermediate shim 500 and the third friction plate 300.

[0003] This traditional adjustment method has many drawbacks: the debugging cycle is long, requiring multiple assembly, testing, and grinding cycles; the testing process is complex, the feeler gauge testing is highly subjective and prone to errors; precision control is difficult, and it is hard to guarantee the gap accuracy when multiple parts are adjusted in a coordinated manner; assembly consistency is poor, and it is difficult to achieve a unified standard for the gap of friction plates in various equipment during mass production, which cannot meet the needs of high precision and mass production of CNC machine tools.

[0004] Therefore, there is an urgent need for a grinding device and grinding method that can integrate gap control into the entire grinding process, simplify operation, and controllable precision, in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] To at least partially solve the technical problems existing in the prior art, the present invention provides a grinding device and grinding method for locking friction plates of CNC machine tool rotary shaft.

[0006] The CNC machine tool rotary axis locking friction plate grinding device of the present invention includes a base, a positioning guide frame, a connecting shaft, a thickness measuring device, a radial positioning device, a pressure block, a set screw, and a pressure cover. The positioning guide frame is positioned and connected to the base through the connecting shaft, and the positioning guide frame can rotate 90° around the connecting shaft to avoid the workpiece grinding area or to reset and press. The thickness measuring device is fixed on the positioning guide frame by a locking screw and is used for thickness detection, scale calibration, and gap calculation reference positioning during grinding. The radial positioning device is positioned and installed on the base to adjust the concentricity of the friction plate and the intermediate pad. The set screw cooperates with the pressure block to press the positioning guide frame during grinding to ensure grinding stability. The pressure cover is installed on the positioning guide frame to assist in positioning the thickness measuring device and improve measurement accuracy.

[0007] Furthermore, in the above-mentioned CNC machine tool rotary axis locking friction plate grinding device, the base is circular, the base has a mounting platform in the middle, the positioning guide frame is connected to the mounting platform through a connecting shaft, and multiple T-slots are evenly distributed on the base.

[0008] Furthermore, in the aforementioned CNC machine tool rotary axis locking friction plate grinding device, the thickness measuring device includes a connecting column, an adjusting plate, an adjusting screw, a first measuring plate, and a second measuring plate. One end of the connecting column is fixed to the positioning guide frame by a locking screw. The adjusting plate is welded to the middle of the connecting column, and the adjusting screw is threadedly engaged with the adjusting plate. The first measuring plate is fixed to the other end of the connecting column, and the second measuring plate is rotatably connected to the adjusting screw. A keyway is provided on one side of the second measuring plate, and a keyway is provided on the side of the first measuring plate near the measuring plate. The second measuring plate is guided and connected to the keyway on the first measuring plate through the keyway. The first measuring plate can be moved along the direction of the keyway by the adjusting screw. The side of the first measuring plate is marked with a scale for intuitive reading of the measurement values.

[0009] Furthermore, in the above-mentioned CNC machine tool rotary axis locking friction plate grinding device, the radial positioning device includes a T-shaped base, a limiting screw, a positioning screw, and a positioning plate. The T-shaped base is matched with the T-shaped groove and is slidably disposed in the T-shaped groove. The limiting screw is threadedly engaged with the bottom of the T-shaped base to limit the T-shaped base within the T-shaped groove. The positioning screw is threadedly engaged with the upper middle part of the T-shaped base and is rotatably connected to the positioning plate to adjust the radial position of the positioning plate, thereby achieving concentric positioning of the friction plate and the intermediate pad.

[0010] Furthermore, in the above-mentioned CNC machine tool rotary shaft locking friction plate grinding device, the positioning plate is arranged in an arc shape.

[0011] Furthermore, in the above-mentioned CNC machine tool rotary shaft locking friction plate grinding device, the base is evenly arranged with multiple threaded holes, and matching process screws are installed on the threaded holes for fixing the intermediate pad and friction plate.

[0012] The grinding method for locking friction plates of CNC machine tool rotary shafts of the present invention includes the following steps: Step 1: Determine the accuracy requirements for the gap between the first friction plate and the second friction plate, and the gap between the second friction plate and the third friction plate. Design the second friction plate as a friction plate containing an outer step and an inner step. Combined with the thickness of the intermediate pad, calculate the target dimensions of the outer step thickness and the inner step thickness of the second friction plate as the basis for grinding. Step 2: Fix the intermediate pad and friction plate to the base with process screws and pre-tighten them; Step 3: Adjust the radial position of the friction plate fixed on the base using the radial positioning device to make the friction plate concentric with the intermediate pad, and then fix the radial positioning device. Step 4: Rotate the positioning guide frame 90° to avoid the workpiece, adjust the thickness measuring device to fit with the intermediate pad, and calibrate the scale of the measuring plate; Step 5: Detect the current thickness of the friction plate using a thickness measuring device, and determine the grinding amount of the inner and outer step surfaces of the friction plate in combination with the target dimension calculated in Step 1; Step 6: Reset the positioning guide frame and tighten it. Start the grinding device and perform precise grinding on the step surface of the friction plate according to the determined grinding amount. Step 7: Use a thickness measuring device to check the step size of the friction plate after grinding, and verify whether the thickness of the outer step and the inner step of the second friction plate meet the accuracy requirements. After acceptance, the grinding is completed.

[0013] Furthermore, in the above-mentioned grinding method for locking friction plates of CNC machine tool rotary axes, in step 1, the calculation formulas for the accuracy requirements of the gap between the first friction plate and the second friction plate, and the gap between the second friction plate and the third friction plate are as follows: ; in, The gap between the first friction plate and the second friction plate. This refers to the thickness of the outer step of the second friction plate. The thickness of the inner step of the second friction plate; ; in, The gap between the second and third friction plates. This refers to the thickness of the intermediate pad. This refers to the thickness of the outer step of the second friction plate.

[0014] Furthermore, the above-mentioned grinding method for the locking friction plate of the rotary axis of a CNC machine tool also includes an optimized derivation formula for verifying the grinding amount and clearance accuracy. The optimized formula is as follows: ; in, The gap between the first friction plate and the second friction plate. This refers to the thickness of the intermediate pad. The gap between the second and third friction plates. This refers to the thickness of the inner step of the second friction plate.

[0015] Furthermore, in the above-mentioned grinding method for locking friction plates of CNC machine tool rotary shaft, in step 6, the grinding dimensions can be detected in real time by a thickness measuring device during the grinding process to avoid over-grinding.

[0016] The CNC machine tool rotary shaft locking friction plate grinding device and grinding method of the present invention have the following advantages and beneficial effects: The grinding device of the present invention effectively realizes the one-time forming of the friction plate gap, greatly reduces the difficulty of friction plate assembly and adjustment, shortens the debugging cycle, and improves the efficiency of mass production. At the same time, the assembly and fit can be adjusted according to friction plates of different specifications, and the applicability range is wide. The thickness measuring device has intuitive scale, and the radial positioning device is easy to adjust, which effectively reduces the skill requirements of operators and facilitates on-site promotion and use. The grinding method for locking friction plates of CNC machine tool rotary shafts transforms the complex multi-component gap control into size matching between a single friction plate and an intermediate pad by designing a stepped second friction plate. Combined with the precise positioning and measurement functions of a dedicated grinding device, the gap accuracy between friction plates can be guaranteed in one grinding operation, effectively solving the problem of poor assembly consistency in traditional methods and meeting the high-precision braking requirements of CNC machine tools. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of a conventional CNC machine tool rotary axis braking device; Figure 2 This is a schematic diagram of the CNC machine tool rotary shaft locking friction plate grinding device of the present invention; Figure 3This is a schematic diagram of the working state of the CNC machine tool rotary shaft locking friction plate grinding device of the present invention; Figure 4 This is a schematic diagram of the thickness measuring device structure of the CNC machine tool rotary shaft locking friction plate grinding device of the present invention; Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of AA; Figure 6 This is a front view of the radial positioning device of the CNC machine tool rotary axis locking friction plate grinding device of the present invention; Figure 7 This is a top view of the radial positioning device of the CNC machine tool rotary shaft locking friction plate grinding device of the present invention; Figure 8 This is a schematic diagram of the friction plate gap control dimension in the CNC machine tool rotary shaft locking friction plate grinding method of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100: Piston; 200: First friction plate; 300: Third friction plate; 400: Second friction plate; 500: Pad; 1: Base; 11: Mounting platform; 12: T-slot; 13: Threaded hole; 14: Process screw; 2: Positioning guide frame; 3: Connecting shaft; 4: Thickness measuring device; 41: Connecting column; 42: Adjusting plate; 43: Adjusting screw; 44: First measuring plate; 45: Keyway; 46: Second measuring plate; 47: Keyway. 5: Radial positioning device; 51: T-shaped base; 52: Limit screw; 53: Positioning screw; 54: Positioning plate; 6: Pressure block; 7: Set stud; 8: Pressure cap. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] like Figures 2 to 7As shown, the CNC machine tool rotary axis locking friction plate grinding device of the present invention includes a base, a positioning guide frame, a connecting shaft, a thickness measuring device, a radial positioning device, a pressure block, a set screw, and a pressure cover. The positioning guide frame is positioned and connected to the base through the connecting shaft, and the positioning guide frame can rotate 90° around the connecting shaft to avoid the workpiece grinding area or to reset and press. The thickness measuring device is fixed on the positioning guide frame by a locking screw and is used for thickness detection, scale calibration, and gap calculation reference positioning during the grinding process. The radial positioning device is positioned and installed on the base to adjust the concentricity of the friction plate and the intermediate pad. The set screw cooperates with the pressure block to press the positioning guide frame during grinding to ensure grinding stability. The pressure cover is installed on the positioning guide frame to assist in positioning the thickness measuring device and improve measurement accuracy.

[0021] Furthermore, in the CNC machine tool rotary shaft locking friction plate grinding device of the present invention, the base is circular, a mounting platform is provided in the middle of the base, the positioning guide frame is connected to the mounting platform through a connecting shaft, and multiple T-slots are evenly distributed on the base.

[0022] Furthermore, in the CNC machine tool rotary shaft locking friction plate grinding device of the present invention, the thickness measuring device includes a connecting column, an adjusting plate, an adjusting screw, a first measuring plate, and a second measuring plate. One end of the connecting column is fixed to the positioning guide frame by a locking screw. The adjusting plate is welded to the middle of the connecting column. The adjusting screw is threadedly engaged with the adjusting plate. The first measuring plate is fixed to the other end of the connecting column. The second measuring plate is rotatably connected to the adjusting screw. A keyway is provided on one side of the second measuring plate. A keyway is provided on the side of the first measuring plate near the measuring plate. The second measuring plate is guided and connected to the keyway on the first measuring plate through the keyway. The first measuring plate can be moved along the keyway direction by the adjusting screw. The side of the first measuring plate is marked with a scale for intuitive reading of the measurement value, reducing measurement errors and ensuring accurate gap calculation.

[0023] Furthermore, in the CNC machine tool rotary axis locking friction plate grinding device of the present invention, the radial positioning device includes a T-shaped base, a limiting screw, a positioning screw, and a positioning plate. The T-shaped base is matched with a T-shaped groove and is slidably disposed in the T-shaped groove. The limiting screw is threadedly engaged with the bottom of the T-shaped base to limit the T-shaped base within the T-shaped groove. The positioning screw is threadedly engaged with the upper middle part of the T-shaped base and is rotatably connected to the positioning plate to adjust the radial position of the positioning plate and realize the concentric positioning of the friction plate and the intermediate pad.

[0024] Furthermore, in the CNC machine tool rotary shaft locking friction plate grinding device of the present invention, the positioning plate is arranged in an arc shape, thereby improving the positioning accuracy.

[0025] Furthermore, in the CNC machine tool rotary shaft locking friction plate grinding device of the present invention, a plurality of threaded holes are evenly arranged around the base, and matching process screws are installed on the threaded holes to fix the intermediate pad and friction plate, thereby achieving pre-tightening and fixing of the workpiece and avoiding displacement during the grinding process.

[0026] like Figure 8 As shown, the grinding method for locking friction plates of CNC machine tool rotary shafts of the present invention includes the following steps: Step 1: Determine the accuracy requirements for the gaps between the first and second friction plates, and between the second and third friction plates. Design the second friction plate as one containing outer and inner steps. Based on the thickness of the intermediate pad, calculate the target dimensions for the thickness of the outer and inner steps of the second friction plate. Using this as the basis for grinding, the formulas for calculating the accuracy requirements of the gaps between the first and second friction plates, and between the second and third friction plates, are as follows: ; ; The optimized derivation formula is used for grinding quantity verification to ensure clearance accuracy, as follows: ; ; In the formula described above, The gap between the first friction plate and the second friction plate. The gap between the second and third friction plates. This refers to the thickness of the intermediate pad. This refers to the thickness of the outer step of the second friction plate. The thickness of the inner step of the second friction plate; According to the preset Accuracy requirement (preferably ±0.01mm), calculated as follows , The target size is used as the reference parameter for grinding the friction plate to ensure that the step size after grinding can directly meet the clearance requirements. Step 2: Fix the intermediate pad and friction plate to the base with process screws and pre-tighten them to ensure that the workpiece and the base fit tightly and without looseness, so as to avoid displacement during grinding, which would affect the step size and gap accuracy, and make full use of the positioning and fixing function of the base. Step 3: Adjust the radial position of the friction plate fixed on the base using the radial positioning device to make the friction plate concentric with the intermediate pad, and then fix the radial positioning device. Specifically, adjust the two radial positioning devices on the base, rotate the positioning screw to push the positioning plate to fit the inner diameter of the friction plate until the friction plate and the intermediate pad are aligned concentrically, tighten the limit screw to fix the position of the radial positioning device, complete the concentric positioning before grinding, and avoid grinding eccentricity that causes gap deviation. Step 4: Rotate the positioning guide frame 90° to avoid the workpiece, adjust the thickness measuring device to fit with the intermediate pad, and calibrate the scale of the measuring plate; Specifically, loosen the set screw, rotate the pressure block, and rotate the positioning guide frame 90° around the connecting shaft to avoid the workpiece grinding area, leaving space for subsequent measurement operations; based on the intermediate pad thickness calculated in step 1... The position of the thickness measuring device is adjusted by tightening the locking screws to ensure that the second measuring plate of the thickness measuring device is in close contact with the intermediate pad. The scale of the first measuring plate is calibrated by adjusting the adjusting screws to ensure that the measurement reference is accurate and to provide a reliable basis for subsequent grinding amount determination and accuracy detection. Step 5: Detect the current thickness of the friction plate using a thickness measuring device, and determine the grinding amount of the inner and outer step surfaces of the friction plate in combination with the target dimension calculated in Step 1; Specifically, the first measuring plate (22) of the thickness measuring device (2) is adjusted so that it is in contact with the surface to be ground of the second friction plate (11), and the scale value is read. This value is then combined with the result calculated in step 1. , The target size is precisely determined to determine the specific grinding amount of the inner and outer step surfaces of the friction plate, ensuring that the step size after grinding meets the requirements of the clearance control formula, and realizing the synchronous connection between clearance control and grinding. Step 6: Reset the positioning guide frame and tighten it. Start the grinding device and perform precise grinding on the step surface of the friction plate according to the determined grinding amount. During the grinding process, the grinding dimension can be detected in real time by the thickness measuring device to avoid over-grinding. Specifically, rotate the positioning guide frame to reset and stand up, press the positioning guide frame with the pressure block, and pre-tighten the set screw to ensure that the positioning guide frame is firmly fixed to avoid shaking of the device during grinding. Start the grinding device and grind the inner and outer step surfaces of the friction plate precisely according to the determined grinding amount. During the grinding process, the grinding dimension can be detected in real time by the thickness measuring device to avoid over-grinding and ensure grinding accuracy. Step 7: Use a thickness measuring device to check the step size of the friction plate after grinding, and verify whether the thickness of the outer step and the inner step of the second friction plate meet the accuracy requirements. After acceptance, the grinding is completed. Specifically, after grinding is completed, the grinding equipment is turned off, the set screw is loosened, the positioning guide is rotated, and the thickness of the friction plate step is checked again using a thickness measuring device to confirm the thickness. , The dimensional error meets the preset accuracy requirements; the ground friction pads and intermediate pads are assembled, and the clearance formula is used for verification. , Whether the braking requirements are met, the entire grinding process is completed after acceptance, realizing the integration of "grinding-gap control-inspection" without the need for additional assembly and debugging.

[0027] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding device for locking friction plates on a CNC machine tool rotary axis, characterized in that, The CNC machine tool rotary axis locking friction plate grinding device includes a base, a positioning guide frame, a connecting shaft, a thickness measuring device, a radial positioning device, a pressure block, a set screw, and a pressure cover. The positioning guide frame is positioned and connected to the base via the connecting shaft, and the positioning guide frame can rotate 90° around the connecting shaft to avoid the workpiece grinding area or to reset and press. The thickness measuring device is fixed on the positioning guide frame by a locking screw and is used for thickness detection, scale calibration, and gap calculation reference positioning during grinding. The radial positioning device is positioned and installed on the base to adjust the concentricity of the friction plate and the intermediate pad. The set screw cooperates with the pressure block to press the positioning guide frame during grinding to ensure grinding stability. The pressure cover is installed on the positioning guide frame to assist in positioning the thickness measuring device and improve measurement accuracy.

2. The CNC machine tool rotary axis locking friction plate grinding device according to claim 1, characterized in that, The base is circular, with a mounting platform in the center. The positioning guide frame is connected to the mounting platform via a connecting shaft, and multiple T-slots are evenly distributed on the base.

3. The CNC machine tool rotary axis locking friction plate grinding device according to claim 1, characterized in that, The thickness measuring device includes a connecting column, an adjusting plate, an adjusting screw, a first measuring plate, and a second measuring plate. One end of the connecting column is fixed to the positioning guide frame by a locking screw. The adjusting plate is welded to the middle of the connecting column, and the adjusting screw is threaded into the adjusting plate. The first measuring plate is fixed to the other end of the connecting column, and the second measuring plate is rotatably connected to the adjusting screw. A keyway is provided on one side of the second measuring plate, and a keyway is provided on the side of the first measuring plate near the measuring plate. The second measuring plate is guided and connected to the keyway on the first measuring plate through the keyway. The first measuring plate can be moved along the direction of the keyway by the adjusting screw. The side of the first measuring plate is marked with graduations for intuitive reading of the measurement values.

4. The CNC machine tool rotary axis locking friction plate grinding device according to claim 2, characterized in that, The radial positioning device includes a T-shaped base, a limiting screw, a positioning screw, and a positioning plate. The T-shaped base is matched with the T-shaped groove and is slidably disposed in the T-shaped groove. The limiting screw is threadedly engaged with the bottom of the T-shaped base to limit the T-shaped base within the T-shaped groove. The positioning screw is threadedly engaged with the upper middle part of the T-shaped base and is rotatably connected to the positioning plate to adjust the radial position of the positioning plate, thereby achieving concentric positioning of the friction plate and the intermediate pad.

5. The CNC machine tool rotary axis locking friction plate grinding device according to claim 4, characterized in that, The positioning plate is arranged in an arc shape.

6. The CNC machine tool rotary axis locking friction plate grinding device according to claim 1, characterized in that, The base is evenly arranged with multiple threaded holes, and matching process screws are installed in the threaded holes to fix the intermediate pad and friction plate.

7. A grinding method implemented using a CNC machine tool rotary axis locking friction plate grinding device according to any one of claims 1 to 6, characterized in that, The grinding method for locking friction plates on the rotary axis of a CNC machine tool includes the following steps: Step 1: Determine the accuracy requirements for the gap between the first friction plate and the second friction plate, and the gap between the second friction plate and the third friction plate. Design the second friction plate as a friction plate containing an outer step and an inner step. Combined with the thickness of the intermediate pad, calculate the target dimensions of the outer step thickness and the inner step thickness of the second friction plate as the basis for grinding. Step 2: Fix the intermediate pad and friction plate to the base with process screws and pre-tighten them; Step 3: Adjust the radial position of the friction plate fixed on the base using the radial positioning device to make the friction plate concentric with the intermediate pad, and then fix the radial positioning device. Step 4: Rotate the positioning guide frame 90° to avoid the workpiece, adjust the thickness measuring device to fit with the intermediate pad, and calibrate the scale of the measuring plate; Step 5: Detect the current thickness of the friction plate using a thickness measuring device, and determine the grinding amount of the inner and outer step surfaces of the friction plate in combination with the target dimension calculated in Step 1; Step 6: Reset the positioning guide frame and tighten it. Start the grinding device and perform precise grinding on the step surface of the friction plate according to the determined grinding amount. Step 7: Use a thickness measuring device to check the step size of the friction plate after grinding, and verify whether the thickness of the outer step and the inner step of the second friction plate meet the accuracy requirements. After acceptance, the grinding is completed.

8. The grinding method for locking friction plates of CNC machine tool rotary shafts according to claim 7, characterized in that, In step 1, the formulas for calculating the required precision of the gaps between the first and second friction plates, and between the second and third friction plates, are as follows: ； in, The gap between the first friction plate and the second friction plate. This refers to the thickness of the outer step of the second friction plate. The thickness of the inner step of the second friction plate; ； in, The gap between the second and third friction plates. This refers to the thickness of the intermediate pad. This refers to the thickness of the outer step of the second friction plate.

9. The grinding method for locking friction plates of a CNC machine tool rotary axis according to claim 8, characterized in that, It also includes optimized derivation formulas for verifying grinding amount and clearance accuracy. The optimized formulas are as follows: ； in, The gap between the first friction plate and the second friction plate. This refers to the thickness of the intermediate pad. The gap between the second and third friction plates. This refers to the thickness of the inner step of the second friction plate.

10. The grinding method for locking friction plates of a CNC machine tool rotary axis according to claim 7, characterized in that, In step 6, the grinding dimensions can be detected in real time by a thickness measuring device during the grinding process to avoid over-grinding.

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