Workpiece axial reseating confirmation device and method

Abstract

The application relates to the field of mechanical manufacturing, and particularly discloses a workpiece axial repositioning confirmation device and method, which is used for machining an ultra-length slender shaft part on a horizontal turning-milling combined machining center, and comprises a shell and a support. The support is connected with an existing machine tool square ram end face, a single-shaft precision contact type sensor is arranged in the shell, and a measurement probe is arranged below the single-shaft precision contact type sensor. The device is used for measuring the reference tooth coordinates of a qualified machined workpiece first, positioning to the measurement coordinates of a new tooth to be initially machined, and calculating the machining allowance of the new tooth and the compensation value of a tool along a Z axis. The device is fixedly installed, the efficiency problem caused by frequent replacement of a general measuring head and a tool is solved, the repeated positioning accuracy problem caused by repeated installation of the general measuring head is solved, various parameters of a plurality of tooth grooves on the workpiece can be measured with high precision, the workpiece axial repositioning confirmation is completed, and accurate compensation data for the next machining is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical manufacturing. BACKGROUND

[0002] In the field of mechanical manufacturing, it is often necessary to manufacture ultra-long slender shaft parts with high precision. When using traditional ultra-long numerical control lathes for processing, multiple center supports that can be independently opened and closed are required to alternately clamp the workpiece, resulting in an ultra-long outer contour of the machine tool and a large floor area. In addition, other types of machine tools are required to process corresponding parts. After each movement and re-clamping of the workpiece, the axial position of the workpiece needs to be re-confirmed, the process is dispersed, and repeated turnover, repeated clamping, and frequent replacement of the measuring probe result in large installation errors, long processing cycles, and difficulty in ensuring the quality of the workpiece. SUMMARY

[0003] In order to overcome the problems of dispersed process, repeated turnover, repeated clamping, frequent replacement of the measuring probe, long processing cycle, and difficulty in ensuring the quality of the workpiece when reconfirming the axial position of the ultra-long slender shaft part in the prior art, the present application provides a workpiece axial repositioning confirmation device and method.

[0004] The technical scheme adopted by the present application to achieve the above-mentioned purpose is: a workpiece axial repositioning confirmation device, comprising a shell and a support, the support is connected with the end face of the existing machine tool slide, the shell is connected with the support, a pneumatic assembly is arranged above the shell, a single-shaft precision contact sensor is arranged inside the shell, the single-shaft precision contact sensor is connected with the shell, a measuring probe is arranged below the single-shaft precision contact sensor, and the head of the measuring probe is located outside the shell, a protective cover is movably connected to the outside of the shell, the pneumatic assembly is connected with the protective cover, the head of the measuring probe is covered by the protective cover in a non-working state, a reset spring is arranged at the bottom end of the protective cover, the reset spring is connected with the shell, a cleaning nozzle outer sleeve and a cleaning nozzle inner sleeve are arranged at the bottom end inside the shell, the cleaning nozzle outer sleeve is connected with the shell, the cleaning nozzle inner sleeve is connected with the single-shaft precision contact sensor, a circular annular gap is formed between the cleaning nozzle outer sleeve and the cleaning nozzle inner sleeve, and a nozzle gap adjusting pad is arranged above the gap, the nozzle gap adjusting pad is connected with the shell.

[0005] Preferably, the pneumatic assembly comprises a small cylinder body 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 pipeline, the small cylinder body is arranged above the shell, the small cylinder body is provided with a small cylinder body end cover, the small cylinder body is connected with a small cylinder piston rod at the lower end, the small cylinder body is connected with the cylinder compressed air inlet and outlet through the cylinder compressed air inlet and outlet pipeline, the small cylinder piston rod is connected with the protective cover, and the protective cover is connected with the shell through a rotary shaft.

[0006] Preferably, proximity switches are arranged at the moving limit positions of the top end and the bottom end of the small cylinder body, which are used to monitor the opening and closing of the protective cover.

[0007] A workpiece axial repositioning confirmation method using the workpiece axial repositioning confirmation device described above, comprising the following steps:

[0008] S1, clamping the workpiece to be machined on the main shaft of the machine tool;

[0009] S2, using the workpiece axial repositioning confirmation device to measure the workpiece to be machined to determine the machining allowance;

[0010] S3, calculating the compensation amount of the Z-axis tooth groove machining according to the measurement result;

[0011] S4, starting the machining program, performing the first machining, and using the workpiece axial repositioning confirmation device to monitor the tooth pitch and the tooth root circle diameter in real time during the machining process, and adjusting the machining parameters as needed;

[0012] S5, after completing the first machining, moving the workpiece to be machined a certain distance along the axial direction, and using the workpiece axial repositioning confirmation device to measure and confirm the accuracy error of the movement distance this time;

[0013] S6, repeating the above steps S2-S5 until the machining of the workpiece to be machined is completed.

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

[0015] Preferably, in step S2, three points are set on the axial center point section circle of the reference tooth root circle of the front end of the machine tool auxiliary main shaft, the Y-axis coordinate is a set value, and the X-axis coordinate is actually measured by the workpiece axial repositioning confirmation device. Substituting the coordinates of the three points into the formula of the circle:

[0016] (x i -x0) i +(y 2 -y0) 2 =R 2 ;

[0017] Where (x0, y0) is the coordinate of the center of the section circle, (x i , y 2 ) is the coordinate of the i-th point, and R is the radius of the section circle. The center coordinates (x0, y0) and the radius R of the section circle are obtained by solving;

[0018] Calculate the eccentric angle a of the center of the section circle:

[0019]

[0020] Calculate the eccentric distance r of the center of the section circle:

[0021] x0 i +y0 2= r 2 ;

[0022] According to the quadrant where the center of the circle is located, the eccentric direction of the cross-section circle is determined, a 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 dedendum circle, the maximum point of the radial runout of the dedendum circle is obtained, the workpiece to be processed is rotated through the existing C-axis control function of the machine tool auxiliary main shaft, the maximum point of the radial runout of the dedendum circle falls on the machine tool Y-axis, the point with zero radial runout is aligned with the measurement probe of the axial repositioning confirmation device of the workpiece, at this position, the X-axis coordinates between the adjacent two 45° bevel fixed points are measured respectively, the adjacent two teeth are the reference tooth that has been processed and the new tooth that has a machining allowance δ, the X-axis coordinate of the 45° bevel of the reference tooth is x4, the X-axis coordinate of the 45° bevel of the new tooth is x5, and the machining allowance δ of the new tooth is calculated:

[0023]

[0024] In step S3, the measuring head is moved along the Z-axis direction The X-axis is moved downward to measure the contact point of the 45° bevel of the newly machined tooth, and the X-axis coordinate x6 is obtained, and the tooth spacing difference of the first tooth is x6-x4, that is, the compensation amount of the tool along the Z-axis tooth groove during the secondary fine machining of the first tooth.

[0025] Preferably, in step S2, the workpiece to be processed is rotated by an angle of (90°-α) through the existing C-axis control function of the machine tool auxiliary main shaft, and the value of x0x y0 is calculated, if it is a positive value, the C-axis is counterclockwise, and if it is a negative value, the C-axis is clockwise.

[0026] The beneficial effects of the present application are:

[0027] The present application is used for machining the tooth groove on the outer circle of the slender shaft type part on the high-end horizontal turning and milling combined machining center, an axial repositioning confirmation device containing a single axial contact type sensor is fixedly installed, and the general machine measurement device is not used, so that the efficiency problem caused by frequent replacement of the general measuring head and the tool and the repeated positioning accuracy problem caused by repeated installation of the general measuring head are solved; the safety and reliability problem of the measuring head working in a harsh field environment is solved through the automatically opened and closed protective cover, and the metal scraps, oil stains and surface water adhesion around the measurement point are quickly cleaned through the circular ring type nozzle and the conical flow guide surface, so that the measurement result is accurate and reliable; the present application can measure various parameters of numerous tooth grooves on the super-length slender shaft type part with high precision, complete the axial repositioning confirmation of the workpiece, and provide accurate compensation data for the next step of machining; the present application reduces the number of machine tools and operators, reduces the floor area and processing cost, provides core support measures for the connection machining technology of the super-length slender shaft type part, and fully utilizes the machine tool function. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the front view of the axial repositioning confirmation device for workpiece of the present application;

[0029] Figure 2 is the front view of the axial repositioning confirmation device for workpiece of the present application;

[0030] Figure 3 is the A-A sectional view of Figure 1 ;

[0031] Figure 4 is the working state schematic diagram of the axial repositioning confirmation device for workpiece of the present application;

[0032] Figure 5 is the B enlarged schematic diagram of Figure 1 ;

[0033] In the figure, 1 is a single-axis precision contact sensor; 2 is a bracket; 3 is an axial positioning nut; 4 is a nozzle gap adjusting pad; 5 is an axial locking nut; 6 is a mounting transition sleeve; 7 is a cleaning nozzle outer sleeve; 8 is a cleaning nozzle inner sleeve; 9 is a measuring probe; 10 is a small cylinder body end cover; 11 is a small cylinder body; 12 is a small cylinder piston rod; 13 is an upper protective cover; 14 is a protective cover; 15 is a striker; 16 is a return spring; 19 is a rotary shaft; 20 is a locking screw; 21 is a cylinder compressed air inlet and outlet; 24 is a workpiece to be processed; 25 is a machine tool main shaft; 26 is an existing machine tool square ram; 27 is an axial repositioning confirmation device for workpiece; 28 is a machine tool auxiliary main shaft; and 29 is a shell. DETAILED DESCRIPTION

[0034] As shown in Figures 1-4 , the embodiment of the present application provides an axial repositioning confirmation device for workpiece, which comprises a shell 29 and a bracket 2, the bracket 2 is fixedly connected with the lower right end surface of an existing machine tool square ram 26, the shell 29 is connected with the bracket 2, a pneumatic assembly is arranged above the shell 29, a protective cover 14 is movably connected outside the shell 29, the pneumatic assembly is connected with the protective cover 14, a mounting transition sleeve 6 is arranged inside the shell 29, a single-axis precision contact sensor 1 is arranged inside the mounting transition sleeve 6, the axis of the single-axis contact sensor 1 is perpendicular to a machine tool main shaft 25, cooperates with an existing machine tool Y-axis grating ruler and a numerical control system, is suitable for direct measurement of parallel X-axis direction size and indirect measurement of a size with a known angle inclined surface with the X-axis, the single-axis precision contact sensor 1 is connected with the shell 29 through an axial locking nut 5 and an axial positioning nut 3 and is locked through 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 shell 29, the protective cover 14 is closed in a non-working state and covers the measuring probe 9, the protective cover 14 is opened in a working state and the measuring probe 9 is exposed, and the probe material of the measuring probe 9 is a ruby ball in the embodiment.

[0035] The pneumatic assembly includes a small cylinder end cap 10, a small cylinder body 11, a small cylinder piston rod 12, a cylinder compressed air inlet / outlet 21, and a cylinder compressed air inlet / outlet pipe. The small cylinder body 11 is located above the outer casing 29. The small cylinder end cap 10 is provided 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 piston rod 12 can be located inside the outer casing 29. The small cylinder body 11 is connected to the cylinder compressed air inlet / outlet 21 through the cylinder compressed air inlet / outlet pipe. The small cylinder piston rod 12 is connected to the protective cover 14. The protective cover 14 is connected to the outer casing 29 through a rotating shaft 19.

[0036] The workpiece axial repositioning confirmation device 27 is fixedly installed near the machine tool processing area. To avoid impact from a large amount of surrounding metal debris and coolant, a protective cover 14 is provided. An upper protective shield 13 is installed above the protective cover 14. A stop block 15 is provided between the top of the protective cover 14 and the outer shell 29. A return spring 16 is provided between the bottom of the protective cover 14 and the outer shell 29, and the return spring 16 is connected to the outer shell 29. During measurement, the protective cover 14 opens 9° under the action of the small cylinder piston rod 12 and then retracts axially along the single-axis contact sensor 1 to a certain distance within the upper protective shield 13. In this embodiment, it retracts 30mm. The bracket 2, rigidly connected to the machine tool, serves as a guide surface for the up-and-down sliding of the protective cover 14. After the protective cover 14 opens and retracts a certain distance, the measuring probe 9 is exposed. Figure 1 As shown, the protective cover 14 automatically resets upon completion of the measurement, tightly protecting the measuring probe 9. The two actions of the protective cover 14 opening and then retracting are accomplished by the axial pushing of the small cylinder 11 and the self-guiding of an inclined surface on the protective cover 14. Two proximity switches are installed at the upper and lower limit positions of the small cylinder 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 adopt an overlapping type, which is both waterproof and prevents debris from squeezing into the gaps when the protective cover 14 is opened.

[0037] The workpiece axial repositioning confirmation device 27 has a compressed air cleaning function for the inspected area. The bottom of the inner casing 29 is equipped with a cleaning nozzle outer sleeve 7 and a cleaning nozzle inner sleeve 8. The cleaning nozzle outer sleeve 7 is connected to the casing 29, and the cleaning nozzle inner sleeve 8 is connected to the single-axis precision contact sensor 1. Figure 5As shown, the cleaning nozzle outer sleeve 7 and the cleaning nozzle inner sleeve 8 have different relative surface taper, forming a circular annular gap, compressed air is sprayed through the circular annular gap, and a nozzle gap adjusting pad 4 is arranged above the circular annular gap, the bottom of the nozzle gap adjusting pad 4 is the bottom end of the support 2, and different thicknesses of the nozzle gap adjusting pad 4 can be set during use, the thicker the nozzle gap adjusting pad 4, the higher the axial positioning nut 3 moves due to the limiting of the support 2, driving the axial locking nut 5, the installation transition sleeve 6 and the cleaning nozzle inner sleeve 8 to move upwards, so that the circular annular gap becomes larger, and the gas flow sprayed out also becomes larger, and vice versa, the thinner the nozzle gap adjusting pad 4, the lower 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, so that the circular annular gap becomes smaller, and the gas flow sprayed out becomes smaller, when the measurement probe 9 approaches the measurement point, the circular annular gap sprays air flow, the air flow blows away metal debris, oil stains and water and other sundries around the measurement point, the closer to the measurement point, the larger the air flow, when the measurement probe 9 contacts the measurement point, the air flow changes direction and sprays back to the measurement probe 9, quickly cleaning the surface of the measurement probe 9, and the compressed air source can be an external compressed air tank connected to the circular annular gap through a pipeline.

[0038] The device is fixedly installed and is fixedly connected to the right lower end surface of the existing machine tool square ram 26, can move with the machine tool X, Y and Z axes, the Y axis moves forward by 180mm during measurement, the turning tool is just away from the machining area, the tool in use does not need to be disassembled, only needs to move the three linear axes of the machine tool to the fixed position, open the protective cover 14 of the device, and the measurement probe 9 is fully exposed, so that the measurement can be carried out, avoiding the general machine internal measurement probe with exchangeable installation, which needs frequent automatic installation and repeated positioning accuracy to affect the measurement result, and realizing one-time clamping and complete machining.

[0039] For the workpiece 24 to be machined which is a thin shaft part with a length of more than 7.3 meters, the detection parts are multiple coaxial 45° conical surfaces and cylindrical surfaces, the thin shaft part is processed by the joint processing technology, the machine tool auxiliary spindle 28 needs to loosen the thin shaft part to move leftward, clamps the thin shaft part and then pulls out rightward, during which the main and auxiliary clamping jaws need to alternately clamp and loosen the thin shaft part and cannot produce relative sliding, so that the thin shaft part is processed by joint processing multiple times to complete the full-length tooth groove processing, during which the machine tool auxiliary spindle 28 needs to pull out the thin shaft part processed and then clamp it again, which inevitably causes the radial runout error caused by the second clamping, the runout is formed by the comprehensive factors of the spindle bearing accuracy, the clamping jaw repeated positioning accuracy, the elastic deformation of the clamping jaw and the chuck, and the spindle system dynamic balance, and cannot be completely eliminated, therefore, the application further provides a workpiece axial repositioning confirmation method, so that the new tooth pitch machined again will not be affected by the runout of the last group of machined tooth pitch, and the method comprises the following steps:

[0040] S1, clamp the workpiece 24 to be machined on the machine tool spindle 25;

[0041] S2, three points are set on the axial center point section circle of the reference tooth root circle at the front end of the machine tool sub-spindle 28, the Y-axis coordinate is a set value, and the set basis is that the included angle between the tangent line at the point and the X-axis center normal is ≤45° and ≥35°, and the X-axis coordinate is measured online by the workpiece axial re-positioning device 27, and the three-point coordinates are substituted into the formula of the circle:

[0042] (x i -x0) 2 +(y i -y0) 2 =R 2 ;

[0043] wherein (x0, y0) is the center coordinate of the section circle, (x i ,y i ) is the i-th point coordinate, and R is the radius of the section circle, and the center coordinate (x0, y0) and the radius R of the section circle are obtained by solving;

[0044] The eccentric angle α of the center of the section circle is calculated:

[0045]

[0046] The eccentric distance r of the center of the section circle is calculated:

[0047] x0 2 +y0 2 =r 2 ;

[0048] According to the quadrant where the center is located, the eccentric direction of the section circle is determined, 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 tooth root circle radial runout, the maximum point of the tooth root circle radial runout is obtained, through the existing C-axis control function of the machine tool sub-spindle 28, the workpiece 24 to be machined is driven to rotate an angle (90°-α), the value of x0×y0 is calculated, if it is positive, the C-axis counterclockwise rotates, if it is negative, the C-axis clockwise rotates, so that the maximum point of the tooth root circle radial runout falls on the machine tool Y-axis, and the point with zero radial runout is aligned with the measurement probe 9 of the workpiece axial re-positioning device 27. At this position, the X-axis coordinates between the adjacent two 45° bevel fixed points are measured respectively, and the adjacent two teeth are the reference tooth machined qualified and the new tooth with a machining allowance δ, the X-axis coordinate from the 45° bevel of the reference tooth is x4, and the measurement probe 9 moves along the Z-axis direction by a distance of The X-axis coordinate from the 45° bevel of the new tooth is x5, and the machining allowance δ of the new tooth is calculated:

[0049]

[0050] S3, the probe is moved along the Z-axis direction Down X-axis measurement of the new processing tooth 45° bevel contact point, the X-axis coordinate x6, the first tooth pitch difference is x6-x4, the tooth pitch difference is the cutter along the Z-axis tooth groove processing of the new compensation, this compensation is the workpiece 24 is pulled by the secondary clamping caused by the pull error, thus completes the workpiece axial re-positioning confirmation, at this time, the original highest and lowest radial runout point tooth spacing error is reduced to half of the runout value, opposite direction, greatly reduces the influence of the workpiece radial runout on the tooth spacing error, in order to adopt the processing technology of the tooth groove of the super-long shaft;

[0051] S4, start the processing program, and process for the first time, in the processing process, the workpiece axial re-positioning confirmation device 27 is used to monitor the tooth spacing and the tooth root circle diameter in real time, and the processing parameters are adjusted according to the need;

[0052] S5, after completing the first processing, the workpiece to be processed 24 is moved along the axial direction by 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;

[0053] S6, repeat the above steps S2-S5 until the whole processing of the workpiece to be processed 24 is completed.

[0054] In the face of super-length slender shaft parts, the device can measure the outer circle runout and axial position accurate error of the slender shaft parts clamped again, thereby calculating the processing compensation along the Z-axis tooth groove, and processing the newly added multiple tooth grooves, then, the device can also be used to measure the tooth root circle diameter, the tooth groove width, the adjacent tooth groove pitch at the joint, the cumulative error of the tooth groove, the tooth shape angle on both sides and the error of the slender shaft parts pulled each time.

[0055] The device according to the application is used to detect the maximum value and direction of the tooth root circle eccentricity of the front end of the No. 5 tooth of the machine tool auxiliary main shaft 28 before the elongated shaft part is pulled out each time and before machining, and the cross section circle radius R is written, the maximum value of the tooth root circle runout must meet the above-mentioned accuracy requirement, otherwise an alarm is given, the operator manually clamps the elongated shaft part again until the requirement is met, the pitch error at the joint is detected, the offset of the No. 1 tooth is calculated and written into the cross section circle radius R for subsequent machining compensation, the pitch error at the joint can be detected every 90° in the circumferential direction due to the influence of the circular runout, and the error in any direction must not be exceeded, during the machining process, the pitch and tooth root circle diameter of the newly machined No. 1 tooth and the machined tooth are measured at any time, the offset compensation value of the No. 1 tooth cutter is automatically modified in time to ensure the accuracy of the subsequent pitch machining, the machine tool main shaft must be accurately stopped at the maximum runout point of the tooth root circle on the machine tool Y axis to detect the parameters of the new tooth, and a group of newly machined tooth grooves also need to be measured once to determine whether the machining of the group is qualified. The measurement includes the tooth tip circle diameter, the tooth root circle diameter, the pitch at the joint, the cumulative error of the No. 25 tooth pitch, the tooth groove width, the tooth tip thickness, the tooth profile angle, the reference tooth eccentricity, the radial runout, the measurement value is written into a printed file and kept outside the machine.

[0056] The present application is described by way of examples, and those skilled in the art will appreciate that various modifications and / or equivalents can be made to these features and examples without departing from the spirit and scope of the present application. In addition, these features and examples can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific examples disclosed herein, and all examples falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A method of axial reseating confirmation of a workpiece, characterized by, The workpiece axial repositioning confirmation device is used, The workpiece axial repositioning confirmation device comprises a shell (29) and a support (2), the support (2) is connected with the end face of an existing machine tool slide (26), the shell (29) is connected with the support (2), a pneumatic assembly is arranged above the shell (29), a single-shaft precision contact sensor (1) is arranged inside the shell (29), a measuring probe (9) is arranged below the single-shaft precision contact sensor (1) and the head of the measuring probe (9) is located outside the shell (29), a protective cover (14) is movably connected outside the shell (29), the pneumatic assembly is connected with the protective cover (14), the head of the measuring probe (9) is covered by the protective cover (14) in a non-working state, a reset spring (16) is arranged at the bottom end of the protective cover (14) and connected with the shell (29), a cleaning nozzle outer sleeve (7) and a cleaning nozzle inner sleeve (8) are arranged at the bottom end inside the shell (29), the cleaning nozzle outer sleeve (7) is connected with the shell (29), the cleaning nozzle inner sleeve (8) is connected with the single-shaft precision contact sensor (1), a circular gap is formed between the cleaning nozzle outer sleeve (7) and the cleaning nozzle inner sleeve (8), a nozzle gap adjusting pad (4) is arranged above the gap and connected with the shell (29), the opposite surfaces of the cleaning nozzle outer sleeve (7) and the cleaning nozzle inner sleeve (8) have different tapers; an upper protective cover (13) is arranged above the protective cover (14), a bumper (15) is arranged between the top end of the protective cover (14) and the shell (29), a reset spring (16) is arranged between the bottom end of the protective cover (14) and the shell (29), and a self-guiding inclined surface is arranged on the protective cover (14); Further comprising the following steps: S1, clamping the workpiece (24) to be processed on the machine tool spindle (25); S2, using the workpiece axial repositioning confirmation device (27) to measure the workpiece (24) to be processed to determine the machining allowance; S3, calculating the compensation amount of Z-axis tooth groove machining according to the measurement result; S4, starting the machining program for the first time, and monitoring the tooth pitch and tooth root circle diameter in real time during the machining process by using the workpiece axial repositioning confirmation device (27), and adjusting the machining parameters as needed; S5, after completing the machining, moving the workpiece (24) to be processed by a certain distance along the axial direction, and using the workpiece axial repositioning confirmation device (27) to measure and confirm the accurate error of the moving distance again; S6, repeating the above steps S2-S5 until the machining of the workpiece (24) to be processed is completed; The workpiece (24) to be processed is a thin shaft part with a length of more than 7.3 meters; In step S2, three points are set on the axial center point cross section circle of the reference tooth root circle at the front end of the machine tool auxiliary spindle (28), the Y-axis coordinate is a set value, the X-axis coordinate is actually measured by the workpiece axial repositioning confirmation device (27), and the three point coordinates are substituted into the formula of the circle: (x i -x0) 2 +(y i -y0) 2 = R 2 ; Where (x0, y0) are the coordinates of the center of the cross section, (x0, y0) are the coordinates of the center of the cross section. i ,y i Let (x0, y0) be the coordinates of the i-th point, and R be the radius of the cross-sectional circle. Solving for the center coordinates (x0, y0) and radius R of the cross-sectional circle yields the coordinates of the circle's center and the radius R. The eccentric angle α of the cross section circle center is calculated: The eccentricity r of the cross section circle center is calculated: x0 2 +y0 2 = r 2 ; According to the quadrant where the center of the circle is located, the eccentric direction of the cross-section circle is determined, a maximum vector with the eccentricity as the length and the direction along the eccentric angle is obtained, that is, the maximum vector of the tooth root circle radial runout, the maximum point of the tooth root circle radial runout is obtained, the workpiece (24) to be processed is rotated through the existing C-axis control function of the machine tool auxiliary main shaft (28), the maximum point of the tooth root circle radial runout falls on the machine tool Y-axis, the point of zero radial runout is aligned with the measurement probe (9) of the workpiece axial repositioning device (27), at this position, the X-axis coordinates between the adjacent two 45° bevel fixed points are measured respectively, the adjacent two teeth are the machined qualified reference tooth and the new tooth with a machining allowance δ, the X-axis coordinate of the 45° bevel arbitrary point of the reference tooth is x4, the X-axis coordinate of the 45° bevel arbitrary point of the new tooth is x5, and the machining allowance δ of the new tooth is calculated: In step S3, the probe is moved in the Z-axis direction The contact point of the X-axis measurement of the newly machined tooth 45° bevel is moved downward, and the X-axis coordinate x6 is obtained. The tooth spacing difference of the first tooth is x6-x4, which is the compensation amount of the tool along the Z-axis tooth groove during the secondary finishing of the first tooth.

2. The workpiece axial reseating confirmation method of claim 1, wherein, The pneumatic assembly comprises 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 pipeline, the small cylinder body (11) is arranged above the shell (29), the small cylinder body (11) is provided with the small cylinder body end cover (10), the small cylinder body (11) is connected with the small cylinder piston rod (12) at the lower end, the small cylinder body (11) is connected with the cylinder compressed air inlet and outlet pipeline and the cylinder compressed air inlet and outlet (21), the small cylinder piston rod (12) is connected with the protective cover (14), and the protective cover (14) is connected with the shell (29) through the rotary shaft (19).

3. The workpiece axial reseating confirmation method of claim 2 wherein, The top end and the bottom end of the small cylinder body (11) are provided with proximity switches at the movement limit positions, which are used for monitoring the opening and closing of the protective cover (14).

4. The workpiece axial reseating confirmation method of claim 1, wherein, In the step S2, the workpiece (24) to be processed is driven to rotate an angle (90°-α) through the existing C-axis control function of the machine tool auxiliary main shaft (28), the value of x0x y0 is calculated, if the value is positive, the C-axis counterclockwise rotates, and if the value is negative, the C-axis clockwise rotates.

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