Device and method for confirming axial re-in-position of workpiece

Abstract

The invention relates to the field of machine manufacturing, and particularly discloses a device and a method for confirming axial re-positioning of a workpiece, the device is used for processing ultra-long slender shaft parts in a horizontal turning and milling combined machining center, the device comprises a shell and a support, the support is connected with the end face of a square ram of an existing machine tool, and a single-shaft precision contact type sensor is arranged in the shell. A measuring probe is arranged below the single-axis precision contact type sensor, coordinates of a standard tooth which is machined to be qualified are firstly measured through the device, then the standard tooth is positioned to measuring coordinates of a new tooth which is machined preliminarily, and the machining allowance of the new tooth and a compensation value of a cutter along the Z axis are calculated. According to the device, fixed installation is adopted, the efficiency problem caused by frequent replacement and installation of a universal measuring head and a cutter and the repeated positioning precision problem caused by repeated installation of the universal measuring head are solved, various parameters of numerous tooth grooves in a workpiece can be measured with high precision, and axial re-in-place confirmation of the workpiece is completed; accurate compensation data can be provided for next-step processing.

Description

Technical Field

[0001] The invention relates to the field of mechanical manufacturing. Background Art

[0002] In the field of mechanical manufacturing, ultra-long and slender shaft parts often need to be manufactured with high precision. When using traditional ultra-long CNC lathes for processing, multiple center frames that can open and close independently are required to alternately clamp the workpiece, resulting in an ultra-long outer contour of the machine tool and a large footprint. In addition, other types of machine tools are required to process the corresponding parts. After each move and re-clamping of the workpiece, the new axial position of the workpiece must be reconfirmed. The process is scattered, and repeated turnover, repeated clamping and frequent replacement of measuring probes lead to large installation errors and long processing cycles, making it difficult to guarantee the final workpiece quality. Summary of the invention

[0003] In order to overcome the problems of prior art in reconfirming the axial position of ultra-long and slender shaft parts, such as process dispersion, repeated turnover, repeated clamping, frequent replacement of measuring probes, and long processing cycle, which make it difficult to ensure the quality of the workpiece, the present invention provides a workpiece axial re-positioning confirmation device and method.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a workpiece axial re-positioning confirmation device, comprising a shell and a bracket, the bracket is connected to the end face of an existing machine tool square slide, the shell is connected to the bracket, a pneumatic component is arranged above the shell, a single-axis precision contact sensor is arranged inside the shell, the single-axis precision contact sensor is connected to the shell, a measuring probe is arranged below the single-axis precision contact sensor and the head of the measuring probe is located outside the shell, a protective cover (14) is movably connected to the outside of the shell (29), the pneumatic component is connected to the protective cover (14), and the head of the measuring probe (9) is in a non-working state. The protective cover (14) is covered by a protective cover. A return spring (16) is arranged at the bottom end of the protective cover (14). The return spring (16) is connected to the outer shell (29). A cleaning nozzle outer sleeve (7) and a cleaning nozzle inner sleeve (8) are arranged at the bottom end of the inner shell (29). The cleaning nozzle outer sleeve (7) is connected to the outer shell (29). The cleaning nozzle inner sleeve (8) is connected to the single-axis precision contact sensor (1). An annular gap is formed between the cleaning nozzle outer sleeve (7) and the cleaning nozzle inner sleeve (8). A nozzle gap adjustment pad (4) is arranged above the gap. The nozzle gap adjustment pad (4) is connected to the outer shell (29).

[0005] Preferably, the pneumatic component includes a small cylinder end cover, a small cylinder body, a small cylinder piston rod, a cylinder compressed air inlet and outlet, and a cylinder compressed air inlet and outlet pipe. The small cylinder body is arranged above the outer shell, and a small cylinder end cover is arranged on the small cylinder body. The lower end of the small cylinder body is connected to the small cylinder piston rod. The small cylinder body is connected to the cylinder compressed air inlet and outlet through the cylinder compressed air inlet and outlet pipe. The small cylinder piston rod is connected to the protective cover, and the protective cover is connected to the outer shell through a rotating shaft.

[0006] Preferably, proximity switches are provided at the movement limit positions of the top and bottom ends of the small cylinder body for monitoring the opening and closing of the protective cover.

[0007] A method for confirming the axial re-positioning of a workpiece using the above-mentioned workpiece axial re-positioning confirmation device comprises the following steps:

[0008] S1. Clamp the workpiece to be processed on the spindle of the machine tool;

[0009] S2. Use the workpiece axial re-positioning confirmation device to measure the workpiece to be processed and determine the processing allowance;

[0010] S3, calculating the compensation amount of tooth groove processing along the Z axis according to the measurement results;

[0011] S4, start the processing program and perform the first processing. During the processing, use the workpiece axial re-positioning confirmation device to monitor the tooth pitch and root circle diameter in real time, and adjust the processing parameters as needed;

[0012] S5. After completing one processing, the workpiece to be processed is moved axially for a certain distance, and the workpiece axial re-positioning confirmation device is used to measure and confirm the accurate error of this moving distance again;

[0013] S6. Repeat the above steps S2-S5 until the processing of the workpiece is completed.

[0014] Preferably, the workpiece to be processed is a thin shaft part with a length exceeding 7.3 meters.

[0015] Preferably, in step S2, three points are set on the cross-section circle of the axial center point of the root circle of the reference gear at the front end of the machine tool sub-spindle, the Y-axis coordinate is the set value, and the X-axis coordinate is actually measured by the workpiece axial re-positioning confirmation device, and the coordinates of the three points are substituted into the circle formula: ;

[0016] in, is the coordinate of the center of the cross section, For the Point coordinates, is the radius of the cross-section circle, and the coordinates of the center of the cross-section circle are obtained by solving and radius ;

[0017] Calculate the eccentricity of the center of the cross-section circle : ;

[0018] Calculate the eccentricity of the center of the cross-section circle : ;

[0019] Determine the eccentric direction of the cross-section circle according to the quadrant where the center of the circle is located, and obtain the maximum vector with the eccentricity as the length and the direction along the eccentric angle, that is, the maximum vector of the radial runout of the tooth root circle, and obtain the maximum point of the radial runout of the tooth root circle. Through the existing C-axis control function of the machine tool sub-spindle, rotate the workpiece to be processed so that the maximum point of the radial runout of the tooth root circle falls on the Y-axis of the machine tool. The point with zero radial runout is aligned with the measuring probe of the workpiece axial re-positioning confirmation device. At this position, measure the X-axis coordinates between two adjacent 45° inclined surface fixed points respectively. The two adjacent teeth are the qualified reference teeth and the teeth with machining allowance. The new tooth is obtained from any point on the 45° inclined surface of the reference tooth. , the X-axis coordinate of any point on the 45° inclined surface of the new tooth is , calculate the machining allowance of the new tooth : ;

[0020] In step S3, the probe is moved along the Z-axis direction. , move the X axis downward to measure the contact point of the 45° inclined surface of the newly processed tooth, and obtain the X axis coordinate , the pitch difference of the first tooth is obtained as The pitch difference is the compensation amount of the tool along the Z-axis tooth groove when finishing the first tooth.

[0021] Preferably, in step S2, the existing C-axis control function of the machine tool sub-spindle is used to drive the workpiece to rotate by an angle of ,calculate If it is a positive value, the C axis rotates counterclockwise, and if it is a negative value, the C axis rotates clockwise.

[0022] The beneficial effects of the present invention are:

[0023] The present invention is used for machining tooth grooves on the outer circle of slender shaft parts on high-end horizontal turning and milling compound machining centers. It adopts a fixedly installed axial re-positioning confirmation device containing a single axial contact sensor instead of a general in-machine measuring device, thereby solving the efficiency problem caused by frequent replacement of general probes and tools and the problem of repeated positioning accuracy caused by repeated installation of general probes; the present invention solves the safety and reliability problems of the probe working in harsh field environments through an automatically opening and closing protective cover, and at the same time quickly cleans away metal debris, oil stains and surface water attachment around the measuring point through an annular nozzle and a conical guide surface, ensuring that the measurement results are accurate and reliable; the present invention can measure various parameters of numerous tooth grooves on ultra-long and slender shaft parts with high precision, complete the axial re-positioning confirmation of the workpiece, and provide accurate compensation data for the next step of processing; the present invention reduces the number of machine tools and operators, reduces the floor space and processing costs, and provides a core guarantee measure for the follow-up processing technology of ultra-long and slender shaft parts, so that the function of the machine tool can be fully exerted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view of the workpiece axial re-positioning confirmation device of the present invention;

[0025] Figure 2 It is a partial cross-sectional view of a front view of a workpiece axial re-positioning confirmation device of the present invention;

[0026] Figure 3 yes Figure 1 AA section view;

[0027] Figure 4 It is a schematic diagram of the working state of the workpiece axial re-positioning confirmation device of the present invention;

[0028] Figure 5 yes Figure 1 An enlarged schematic diagram of point B.

[0029] In the figure, 1. single-axis precision contact sensor; 2. bracket; 3. axial positioning nut; 4. nozzle gap adjustment pad; 5. axial locking nut; 6. installation transition sleeve; 7. cleaning nozzle outer sleeve; 8. cleaning nozzle inner sleeve; 9. measuring probe; 10. small cylinder end cover; 11. small cylinder body; 12. small cylinder piston rod; 13. upper protective cover; 14. protective cover; 15. bumper; 16. reset spring; 19. rotary shaft; 20. locking screw; 21. cylinder compressed air inlet and outlet; 24. workpiece to be processed; 25. machine tool spindle; 26. existing machine tool square slide; 27. workpiece axial re-positioning confirmation device; 28. machine tool sub-spindle; 29. ​​outer casing. DETAILED DESCRIPTION

[0030] like Figure 1-4As shown, an embodiment of the present invention provides a workpiece axial re-positioning confirmation device, including a housing 29 and a bracket 2, wherein the bracket 2 is fixedly connected to the lower right end surface of the existing machine tool square slide 26, the housing 29 is connected to the bracket 2, a pneumatic component is arranged above the housing 29, a protective cover 14 is movably connected to the outside of the housing 29, the pneumatic component is connected to the protective cover 14, an installation transition sleeve 6 is arranged inside the housing 29, a single-axis precision contact sensor 1 is arranged inside the installation transition sleeve 6, the axis of the single-axis contact sensor 1 is perpendicular to the machine tool spindle 25, and cooperates with the existing machine tool Y-axis grating ruler and CNC The system is suitable for direct measurement of dimensions parallel to the X-axis direction and indirect measurement of dimensions of inclined surfaces with known angles to the X-axis. The single-axis precision contact sensor 1 is connected to the housing 29 through an axial locking nut 5 and an axial positioning nut 3, and is locked by a locking screw 20. A measuring probe 9 is arranged below the single-axis precision contact sensor 1, and the head of the measuring probe 9 exceeds the housing 29. When not in operation, the protective cover 14 is closed, and the protective cover 14 covers the measuring probe 9. When in operation, the protective cover 14 is opened, and the measuring probe 9 is exposed. In this embodiment, the probe material of the measuring probe 9 is a ruby ​​ball.

[0031] The pneumatic component includes a small cylinder body end cover 10, a small cylinder body 11, a small cylinder piston rod 12, a cylinder compressed air inlet and outlet 21 and a cylinder compressed air inlet and outlet pipe. The small cylinder body 11 is arranged above the outer shell 29. The small cylinder body end cover 10 is arranged on the small cylinder body 11. The lower end of the small cylinder body 11 is connected to the small cylinder piston rod 12. The small cylinder piston rod 12 can be located inside the outer shell 29. The small cylinder body 11 is connected to the cylinder compressed air inlet and outlet 21 through the cylinder compressed air inlet and outlet pipe. The small cylinder piston rod 12 is connected to the protective cover 14, and the protective cover 14 is connected to the outer shell 29 through the rotating shaft 19.

[0032] The workpiece axial re-positioning confirmation device 27 is fixedly installed near the machining area of ​​the machine tool. In order to avoid the impact of a large amount of metal debris and coolant in the surrounding area, a protective cover 14 is provided. An upper protective cover 13 is provided above the protective cover 14. A collision block 15 is provided between the top end of the protective cover 14 and the outer shell 29. A reset spring 16 is provided between the bottom end of the protective cover 14 and the outer shell 29. The reset spring 16 is connected to the outer shell 29. When measuring, the protective cover 14 is driven by the small cylinder piston rod 12 to open 9° and then retreat along the axial direction of the single-axis contact sensor 1 to a certain distance in the upper protective cover 13. In this embodiment, it retreats 30mm. The bracket 2 rigidly connected to the machine tool is used as a guide surface for the protective cover 14 to slide up and down. After the protective cover 14 is opened and retreated a certain distance, the measuring probe 9 is exposed. Figure 1As shown, the protective cover 14 automatically resets when the measurement is completed, and the measuring probe 9 is tightly protected. The two actions of the protective cover 14 opening first and then retreating are completed by the axial push of the small cylinder body 11 and the self-guiding of an inclined surface on the protective cover 14. Two proximity switches are respectively set at the upper and lower extreme positions of the small cylinder body 11 to monitor the effective opening and closing of the protective cover 14. The entire protective cover 14 is composed of multiple pieces, and the protective seams from top to bottom are overlapped, which can be waterproof and prevent debris from squeezing into the gap when the protective cover 14 is opened.

[0033] The workpiece axial repositioning confirmation device 27 has a compressed air cleaning function for the detected part. The bottom end of the inner part of the shell 29 is provided with a cleaning nozzle outer sleeve 7 and a cleaning nozzle inner sleeve 8. The cleaning nozzle outer sleeve 7 is connected to the shell 29, and the cleaning nozzle inner sleeve 8 is connected to the single-axis precision contact sensor 1. Figure 5 As shown, the relative tapers of the cleaning nozzle outer sleeve 7 and the cleaning nozzle inner sleeve 8 are different, and an annular gap is formed. The compressed air is ejected through the annular gap. A nozzle gap adjustment pad 4 is arranged above the annular gap. The bottom of the nozzle gap adjustment pad 4 is the bottom end of the bracket 2. When in use, nozzle gap adjustment pads 4 of different thicknesses can be set. The thicker the nozzle gap adjustment pad 4, the axial positioning nut 3 moves upward due to the limitation of the bracket 2, driving the axial locking nut 5, the installation transition sleeve 6 and the cleaning nozzle inner sleeve 8 to move upward, so that the annular gap becomes larger, and the air flow rate ejected also becomes larger. Conversely, the nozzle gap adjustment pad 4 is thicker. The thinner the gap adjustment pad 4 is, the more the axial positioning nut 3 drives the axial locking nut 5, the installation transition sleeve 6 and the cleaning nozzle inner sleeve 8 to move downward, the annular gap becomes smaller, and the amount of air sprayed out becomes smaller. When the measuring probe 9 approaches the measuring point, the annular gap sprays airflow, and the airflow blows away metal debris, oil stains, water and other debris around the measuring point. The closer to the measuring point, the greater the airflow. When the measuring probe 9 contacts the measuring point, the airflow changes direction and sprays in the opposite direction to the measuring probe 9, quickly cleaning the surface of the measuring probe 9. The compressed air source here can be an external compressed air tank, which is connected to the annular gap through a pipeline.

[0034] The device is fixedly installed and fixedly connected to the lower right end face of the existing machine tool square slide 26. It can move with the X, Y and Z axes of the machine tool. When measuring, the Y axis moves forward 180mm, just when the turning tool leaves the processing area. There is no need to remove the tool in use. As long as the three linear axes of the machine tool are moved to a fixed position, the protective cover 14 of the device is opened, and the measuring probe 9 is fully exposed, the measurement can be carried out, avoiding the use of a general in-machine measuring probe installed in an exchangeable manner, which requires frequent automatic installation and repeated positioning accuracy during use. The influence on the measurement result is achieved by one clamping and complete processing.

[0035] For the workpiece 24 to be processed, which is a thin shaft part with a length of more than 7.3 meters, the detection parts need to be multiple coaxial 45° conical surfaces and cylindrical surfaces. The continuous processing technology is used for the slender shaft parts. The machine tool sub-spindle 28 needs to loosen the slender shaft parts and move to the left, clamp them and then pull them out to the right. During this period, the main and auxiliary clamping jaws should alternately clamp and loosen the slender shaft parts, and relative sliding cannot occur. This continuous processing is repeated for multiple times to complete the full-length tooth groove processing. During this period, the machine tool sub-spindle 28 needs to pull out the processed slender shaft parts and re-clamp them, which will inevitably cause radial runout error caused by secondary clamping. This runout is caused by comprehensive factors such as spindle bearing accuracy, jaw repeat positioning accuracy, jaw and chuck elastic deformation, spindle system dynamic balance, etc., and cannot be completely eliminated. For this, the embodiment of the present invention also provides a workpiece axial re-positioning confirmation method, so that the re-processed new tooth pitch will not be affected by the runout of the previous set of processed tooth pitch, including the following steps:

[0036] S1, clamping the workpiece 24 to be processed on the machine tool spindle 25;

[0037] S2. Set three points on the cross-section circle of the axial center point of the root circle of the reference tooth at the front end of the machine tool sub-spindle 28. The Y-axis coordinate is the set value. The setting basis is any point where the angle between the tangent through the center normal line at the point and the X-axis is ≤45° and ≥35°. The X-axis coordinate is actually measured online by the workpiece axial re-positioning confirmation device 27. Substitute the coordinates of the three points into the circle formula: ;

[0038] in, is the coordinate of the center of the cross section, For the Point coordinates, is the radius of the cross-section circle, and the coordinates of the center of the cross-section circle are obtained by solving and radius ;

[0039] Calculate the eccentricity of the center of the cross-section circle : ;

[0040] Calculate the eccentricity of the center of the cross-section circle : ;

[0041] According to the quadrant where the center of the circle is located, the eccentric direction of the cross-section circle is determined, and the maximum vector with the eccentric distance as the length and the direction along the eccentric angle is obtained, that is, the maximum vector of the radial runout of the root circle, and the maximum point of the radial runout of the root circle is obtained. Through the existing C-axis control function of the machine tool sub-spindle 28, the workpiece 24 to be processed is driven to rotate at an angle of ,calculate If the value is positive, the C axis rotates counterclockwise, and if it is negative, the C axis rotates clockwise, so that the maximum point of the radial runout of the tooth root circle falls on the Y axis of the machine tool, and the point with zero radial runout is aligned with the measuring probe 9 of the workpiece axial re-positioning confirmation device 27. At this position, the X-axis coordinates between two adjacent 45° inclined surface fixed points are measured respectively. The adjacent two teeth are the reference teeth that have been processed and qualified and the teeth with machining allowance are left. The new tooth is obtained from any point on the 45° inclined surface of the reference tooth. , the measuring probe 9 moves along the Z axis by , the X-axis coordinate of any point on the 45° inclined surface of the new tooth is , calculate the machining allowance of the new tooth : ;

[0042] S3, move the probe along the Z axis , move the X axis downward to measure the contact point of the 45° inclined surface of the newly processed tooth, and obtain the X axis coordinate , the pitch difference of the first tooth is obtained as The tooth pitch difference is the new compensation amount of the tool along the Z-axis tooth groove when finishing the first tooth again. This compensation amount is the pulling error caused by the machine tool sub-spindle 28 pulling the workpiece 24 to be processed due to the secondary clamping. At this point, the axial re-positioning confirmation of the workpiece is completed. At this time, the tooth pitch error at the original highest and lowest radial runout points is reduced to half of the runout value, and the direction is opposite, which greatly reduces the influence of the workpiece radial runout on the tooth pitch error, so that the continuous processing technology can be used to process the tooth groove of the super-long thin shaft;

[0043] S4, start the machining program and perform the first machining. During the machining process, use the workpiece axial re-positioning confirmation device 27 to monitor the tooth pitch and root circle diameter in real time, and adjust the machining parameters as needed;

[0044] S5. After one processing is completed, the workpiece 24 to be processed is moved axially for a certain distance, and the workpiece axial re-positioning confirmation device 27 is used to measure and confirm the accurate error of the moving distance again;

[0045] S6. Repeat the above steps S2-S5 until all the processing of the workpiece 24 is completed.

[0046] When faced with extra-long slender shaft parts, the device of the present invention can measure the outer circle runout and accurate axial position error of the re-clamped slender shaft parts, thereby calculating the processing compensation amount along the Z-axis tooth groove, and continuously processing multiple newly added tooth grooves. Afterwards, the device can also be used to measure the tooth groove root circle diameter, tooth groove width, adjacent tooth groove spacing at the joint, 25-slot spacing cumulative error, tooth profile angle on both sides, and the error of each time the slender shaft parts are pulled.

[0047] Each time the slender shaft parts are pulled out and before processing, according to the device of the present invention, the maximum value and direction of the eccentricity of the root circle of the fifth tooth at the front end of the machine tool sub-spindle 28 are detected, and the radius of the cross-section circle is written The maximum eccentricity, i.e. the tooth root circle runout, must meet the above-mentioned accuracy requirements. Otherwise, an alarm will sound and the operator will manually intervene to clamp the slender shaft parts again until the requirements are met. The pitch error at the joint will be detected, the offset of the first tooth will be calculated, and the radius of the cross-section circle will be written. , for subsequent processing compensation, the pitch error at the joint, due to the influence of the outer circle runout, can be detected every 90° in the circumferential direction, and no deviation is allowed in any direction. During the processing, the newly processed first tooth and the processed pitch and root circle diameter should be measured at any time, and the first pitch tool offset compensation value should be automatically modified in time to ensure the accuracy of subsequent pitch processing. For each inspection, the machine tool spindle must be stopped at the maximum root circle runout point that falls on the machine tool Y axis to detect the various parameters of the new tooth. A group of newly processed tooth grooves must also be comprehensively measured to determine whether the processing of this group is qualified. Including: tooth top circle diameter, tooth root circle diameter, pitch at the joint, 25-tooth pitch cumulative error, tooth groove width, tooth top thickness, tooth shape angle, reference tooth eccentricity, radial runout, the measured values ​​are written into the print file and retained outside the machine.

[0048] The present invention is described by way of embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. A workpiece axial repositioning confirmation device, characterized in that: The invention comprises a housing (29) and a bracket (2), wherein the bracket (2) is connected to the end surface of an existing machine tool square slide (26), the housing (29) is connected to the bracket (2), a pneumatic component is arranged above the housing (29), a single-axis precision contact sensor (1) is arranged inside the housing (29), a measuring probe (9) is arranged below the single-axis precision contact sensor (1), and the head of the measuring probe (9) is located outside the housing (29), a protective cover (14) is movably connected to the outside of the housing (29), the pneumatic component is connected to the protective cover (14), and the head of the measuring probe (9) is moved when the housing (29) is not in operation. The protective cover (14) is covered, a return spring (16) is arranged at the bottom end of the protective cover (14), the return spring (16) is connected to the outer shell (29), a cleaning nozzle outer sleeve (7) and a cleaning nozzle inner sleeve (8) are arranged at the bottom end of the inner shell (29), the cleaning nozzle outer sleeve (7) is connected to the outer shell (29), the cleaning nozzle inner sleeve (8) is connected to the single-axis precision contact sensor (1), an annular gap is formed between the cleaning nozzle outer sleeve (7) and the cleaning nozzle inner sleeve (8), a nozzle gap adjustment pad (4) is arranged above the gap, and the nozzle gap adjustment pad (4) is connected to the outer shell (29).

2. The workpiece axial re-positioning confirmation device according to claim 1, characterized in that: The pneumatic assembly comprises a small cylinder end cover (10), a small cylinder body (11), a small cylinder piston rod (12), a cylinder compressed air inlet and outlet (21) and a cylinder compressed air inlet and outlet pipe. The small cylinder body (11) is arranged above the outer shell (29). The small cylinder end cover (10) is arranged on the small cylinder body (11). The small cylinder piston rod (12) is connected to the lower end of the small cylinder body (11). The small cylinder body (11) is connected to the cylinder compressed air inlet and outlet (21) via the cylinder compressed air inlet and outlet pipe. The small cylinder piston rod (12) is connected to the protective cover (14). The protective cover (14) is connected to the outer shell (29) via a rotating shaft (19).

3. The workpiece axial re-positioning confirmation device according to claim 2, characterized in that: Proximity switches are provided at the movement limit positions of the top and bottom ends of the small cylinder body (11) for monitoring the opening and closing of the protective cover (14).

4. A method for confirming the axial re-positioning of a workpiece using the device for confirming the axial re-positioning of a workpiece according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, clamping the workpiece (24) to be processed on the machine tool spindle (25); S2, using a workpiece axial re-positioning confirmation device (27) to measure the workpiece (24) to be processed and determine the processing allowance; S3, calculating the compensation amount of tooth groove processing along the Z axis according to the measurement results; S4, start the machining program and perform the first machining. During the machining process, use the workpiece axial re-positioning confirmation device (27) to monitor the tooth pitch and tooth root circle diameter in real time, and adjust the machining parameters as needed; S5, after completing one processing, the workpiece to be processed (24) is moved axially for a certain distance, and the workpiece axial re-positioning confirmation device (27) is used to measure and confirm the accurate error of the moving distance again; S6. Repeat the above steps S2-S5 until the processing of the workpiece (24) is completed.

5. The method for confirming the axial re-positioning of a workpiece according to claim 4, characterized in that: The workpiece (24) to be processed is a thin shaft part with a length exceeding 7.3 meters.

6. The method for confirming the axial re-positioning of a workpiece according to claim 5, characterized in that: In step S2, three points are set on the cross-sectional circle of the axial center point of the root circle of the reference tooth at the front end of the machine tool sub-spindle (28), the Y-axis coordinate is the set value, and the X-axis coordinate is actually measured by the workpiece axial re-positioning confirmation device (27), and the coordinates of the three points are substituted into the circle formula: ； in, is the coordinate of the center of the cross section, For the Point coordinates, is the radius of the cross-section circle, and the coordinates of the center of the cross-section circle are obtained by solving and radius ; Calculate the eccentricity of the center of the cross-section circle : ； Calculate the eccentricity of the center of the cross-section circle : ； The eccentric direction of the cross-section circle is determined according to the quadrant where the center of the circle is located, and the maximum vector with the eccentric distance as the length and the direction along the eccentric angle is obtained, that is, the maximum vector of the radial runout of the tooth root circle, and the maximum point of the radial runout of the tooth root circle is obtained. Through the existing C-axis control function of the machine tool sub-spindle (28), the workpiece to be processed (24) is rotated so that the maximum point of the radial runout of the tooth root circle falls on the Y axis of the machine tool, and the point where the radial runout is zero is aligned with the measuring probe (9) of the workpiece axial re-positioning confirmation device (27). At this position, the X-axis coordinates between two adjacent 45° inclined surface fixed points are measured respectively. The two adjacent teeth are the reference teeth that have been processed and qualified and the teeth with processing allowance left. The new tooth is obtained from any point on the 45° inclined surface of the reference tooth. , the X-axis coordinate of any point on the 45° inclined surface of the new tooth is , calculate the machining allowance of the new tooth : ； In step S3, the probe is moved along the Z-axis direction. , move the X axis downward to measure the contact point of the 45° inclined surface of the newly processed tooth, and obtain the X axis coordinate , the pitch difference of the first tooth is obtained as The pitch difference is the compensation amount of the tool along the Z-axis tooth groove when finishing the first tooth.

7. The method for confirming the axial re-positioning of a workpiece according to claim 6, characterized in that: In step S2, the existing C-axis control function of the machine tool sub-spindle (28) is used to drive the workpiece (24) to rotate by an angle of ,calculate If it is a positive value, the C axis rotates counterclockwise, and if it is a negative value, the C axis rotates clockwise.

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