Turbine disc clamping device and method for mortise grinding machining

Abstract

The invention discloses a turbine disc clamping device and method for mortise grinding machining. The device comprises a base and an offset correction clamping module. And the deflection correction clamping module comprises a profiling positioning disc, a deflection correction mechanism, a central shaft, a shaft body aligning clamping mechanism, a rotary driving motor and a locking nut. And a plurality of mounting grooves are formed in the outer circumferential surface of the profiling positioning disc. And deflection correction mechanisms are mounted in the mounting grooves. The deflection correction mechanism includes a fixed portion and an urging portion. The pushing and pressing part comprises a sliding extrusion structure, a spiral block and an adjusting rotating shaft. The position of the turbine disc is rapidly positioned through the detachable profiling positioning disc, and initial stable clamping of the turbine disc is achieved; a plurality of shaft body aligning and clamping mechanisms are mounted on the outer circumference of a profiling positioning disc; and different degrees of pushing and pressing are applied to different positions of the turbine disc through the shaft body aligning and clamping mechanisms, so that inclination and deflection of the turbine disc are corrected, and the clamping precision of the turbine disc is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine turbine disk processing, and particularly relates to a clamping device and method for a turbine disk in tenon groove grinding processing. Background Art

[0002] In the field of aero-engine turbine disk processing, the turbine disk is a key component of an aero-engine, and the tenon groove of the turbine disk is an important connecting part. The processing of the tenon groove of the turbine disk usually first uses wire cutting, laser cutting and other methods to rough process the tenon groove, and then uses broaching, milling, grinding and other methods to finish process the tenon groove. The surface roughness and profile accuracy of the tenon groove of the turbine disk will directly affect the service performance of the connecting part between the tenon groove of the turbine disk and the blade tenon head. Low surface roughness and high profile accuracy can improve the connection strength and service life of the tenon groove of the turbine disk.

[0003] During grinding processing, the turbine disk often has a small degree of inclination, and its rotation center has a certain degree of offset from the actual center of the turbine disk, resulting in a decrease in the profile accuracy of the tenon groove and an increase in the surface roughness. In the existing turbine disk fixtures, there are functions of positioning and clamping the turbine disk, but the turbine disk still has a certain degree of offset after actual clamping. During the actual clamping process, the clamping accuracy of the turbine disk is often improved by repeated measurement and clamping. This method is time-consuming and laborious. At the same time, during the profile grinding process, due to the action of the normal grinding force, the tenon groove will have a certain degree of offset, resulting in a decrease in the surface roughness and profile accuracy of the tenon groove. In addition, the curved tenon groove shape increases the cooling difficulty of the tenon groove, and the difference in the action of the grinding fluid on each part of the tenon groove is large, which will also reduce its final surface processing quality. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a clamping device and method for a turbine disk in tenon groove grinding processing. First, the turbine disk is initially clamped by a profiling and detachable positioning fixture, and after the initial clamping, the position of the turbine disk plane and axis is adjusted for secondary clamping, improving the position accuracy and clamping efficiency of the tenon groove of the turbine disk; second, through a profiling cooling nozzle, precise and efficient cooling of the tenon groove during the grinding process is achieved, improving the processing quality of the workpiece surface.

[0005] In a first aspect, the present invention provides a turbine disc clamping device for mortise and tenon grinding, which includes a base and an offset correction clamping module. The offset correction clamping module includes a contoured positioning disc, a deflection correction mechanism, a center shaft, a shaft body centering clamping mechanism, a rotary drive motor and a locking nut. Two coaxial and spaced-apart shaft body centering clamping mechanisms are both rotatably connected to the base. The center shaft is clamped between the two shaft body centering clamping mechanisms. One of the shaft body centering clamping mechanisms is connected to the rotary drive motor. A limited position shaft section is provided on the center shaft. The contoured positioning disc is sleeved on the center shaft. The side shape of the contoured positioning disc facing the limited position shaft section matches the side shape of the turbine disc; the locking nut is provided on the side of the contoured positioning disc away from the limited position shaft section and is threadedly connected to the center shaft.

[0006] A plurality of mounting grooves are provided on the outer circumferential surface of the contour positioning disk. Deflection correction mechanisms are installed in the mounting grooves. The deflection correction mechanism includes a fixed part and a pushing part. The pushing part includes a sliding extrusion structure, a spiral block and an adjusting shaft. The sliding extrusion structure is slidably connected to the fixed part along the axial direction of the contour positioning disk. The adjusting shaft is rotatably connected to the fixed part. The spiral block is coaxially fixed to the adjusting shaft. An internal threaded groove is provided on the sliding extrusion structure. The external thread on the spiral block and the internal threaded groove on the sliding extrusion structure form a spiral pair.

[0007] During the working process, the turbine disc is clamped between the contour positioning disc and the limiting shaft section. The deflection of the turbine disc during the grinding process is corrected by adjusting the squeezing degree of the turbine disc by multiple deflection correction mechanisms.

[0008] Preferably, the shaft body centering clamping mechanism includes a centering body and two single-sided clamping structures. The two single-sided clamping structures facing each other are installed in the center hole of the centering body. The single-sided clamping structure includes a radial adjustment screw and a V-shaped clamping block. The V-shaped clamping block and the centering body form a sliding pair that slides radially. A clamping threaded hole is provided on the centering body. A radial adjustment screw is threadedly connected in the clamping threaded hole. The inner end of the radial adjustment screw is rotatably connected to the V-shaped clamping block. During operation, the radial adjustment screw is rotated to allow the V-shaped clamping block to clamp the center axis and adjust the axial position of the center axis.

[0009] Preferably, the device further comprises a cooling module, which comprises a cooling nozzle and a three-axis moving module for driving the cooling nozzle to move.

[0010] Preferably, the shape of the coolant nozzle on the cooling nozzle matches the single-sided side wall of the turbine disc groove.

[0011] Preferably, there are two cooling modules in total. The two cooling modules are respectively arranged on the opposite sides of the turbine disk. The coolant nozzles in the two cooling modules respectively correspond to the two side walls of the dovetail groove of the turbine disk. During the working process, the two cooling modules respectively spray coolant in the opposite direction to the two side walls of the dovetail groove of the turbine disk.

[0012] Preferably, the three-axis moving module includes an X-axis moving device, a Y-axis moving device and a Z-axis moving device which are connected in sequence. The Z-axis moving device includes a Z-axis bracket, a Z-axis driving motor, a Z-axis driving screw and a Z-axis slide rail. The Z-axis slide rail is fixed on the Z-axis bracket. The cooling nozzle is slidably connected with the Z-axis slide rail. The Z-axis driving screw is rotatably connected to the Z-axis bracket. The cooling nozzle is provided with an internal thread groove. The Z-axis driving screw and the internal thread groove on the cooling nozzle form a screw pair. The Z-axis driving screw is driven to rotate by the Z-axis driving motor.

[0013] Preferably, a nut washer is arranged between the locking nut and the profiling positioning disk; a shoulder washer is arranged between the limiting shaft section and the turbine disk.

[0014] Preferably, an axial movement adjusting structure is arranged between the shaft body centering clamping mechanism not connected to the rotary driving motor and the base.

[0015] In a second aspect, the present invention provides a dovetail groove grinding method, which adopts the foregoing turbine disk clamping device for dovetail groove grinding. The dovetail groove grinding method includes the following steps: Step 1: Clamp the turbine disk between the profiling positioning disk and the limiting shaft section, and clamp the central shaft between the two shaft body centering clamping mechanisms. Rotate the adjusting rotating shafts in each deflection correction mechanism so that the sliding extrusion structures in each deflection correction mechanism all abut against the side surface of the turbine disk.

[0016] Step 2: Take a side surface perpendicular to the axis on the turbine disk as a reference plane, use a measuring tool to abut against the reference plane, drive the turbine disk to rotate one week, and judge whether the turbine disk has deflection according to the change range of the measured value of the measuring tool. If the turbine disk has deflection, rotate the adjusting rotating shafts in one or more of the deflection correction mechanisms so that the turbine disk swings under the push of the sliding extrusion structure to correct the deflection of the turbine disk.

[0017] Step 3: Take an outer cylindrical surface on the turbine disk as a reference circumferential surface, use a measuring tool to abut against the reference circumferential surface, drive the turbine disk to rotate one week, and judge whether the turbine disk has axis eccentricity according to the change range of the measured value of the measuring tool. If the turbine disk has axis eccentricity, adjust the axis position of the central shaft by rotating the radial adjusting screws in the two deflection correction mechanisms to improve the coaxiality between the turbine disk and the central shaft.

[0018] Step 4: Adjust the position of the cooling nozzle through the three-axis moving module so that the profiling nozzles in the two cooling modules are respectively close to the opposite sides of the machined mortise groove and are respectively aligned with the two side walls of the machined mortise groove.

[0019] Step 5: The profiling nozzles in the two cooling modules spray coolant; grind the machined mortise groove on the turbine disk with a profiling grinding wheel.

[0020] Preferably, the rotation direction of the profiling grinding wheel matches the coolant spraying direction of the two profiling nozzles, so that the linear velocity directions at both side walls of the turbine disk mortise groove are opposite to the corresponding cooling module coolant spraying directions.

[0021] The present invention has the following beneficial effects.

[0022] 1. The present invention quickly locates the position of the turbine disk through the detachable profiling positioning disk to achieve the preliminary stable clamping of the turbine disk; at the same time, the present invention installs a plurality of shaft alignment clamping mechanisms on the outer circumference of the profiling positioning disk; different degrees of pushing pressure are applied to different positions of the turbine disk through each shaft alignment clamping mechanism to correct the tilt and deflection of the turbine disk, improving the clamping accuracy of the turbine disk, thereby improving the grinding accuracy of the turbine disk mortise groove.

[0023] 2. The present invention uses two shaft alignment clamping mechanisms to clamp both ends of the central shaft. By adjusting the positions of the two V-shaped clamping blocks in the shaft alignment clamping mechanism, the coaxiality error between the central shaft and the rotation center can be corrected, thereby improving the positioning accuracy when different mortise grooves on the turbine disk rotate to the grinding position.

[0024] 3. The present invention arranges cooling modules with profiling nozzles at the two openings on both sides of the turbine disk mortise groove; the profiling nozzles can improve the uniform degree of coolant coverage at different positions on the side walls of the mortise groove; the two profiling nozzles spraying towards each other can make the coolant flow directions on both side walls of the turbine disk mortise groove opposite to the linear velocity at the grinding position of the profiling grinding wheel, improving the heat exchange effect; thereby effectively reducing the residual stress and surface roughness on the surface of the mortise groove generated by grinding through cooling, and improving the final processing quality of the mortise groove.

[0025] 4. The present invention can achieve the preliminary clamping of turbine disks with different profiles by replacing the profiling components on the profiling positioning disk, improving the clamping accuracy, efficiency and stability of the turbine disk. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the offset correction clamping module in the present invention.

[0028] Figure 3This is a schematic cross-sectional view of the offset correction clamping module in the present invention.

[0029] Figure 4 This is a schematic view of the relative positions of the profiling positioning disc and the four deflection correction mechanisms in the present invention.

[0030] Figure 5 This is a schematic cross-sectional view of the deflection correction mechanism in the present invention.

[0031] Figure 6 This is a schematic structural view of the shaft body centering and clamping mechanism in the present invention.

[0032] Figure 7 This is a schematic structural view of the cooling module in the present invention.

[0033] Figure 8 This is a combined schematic view of the cooling nozzle and the Z-axis moving device in the present invention.

[0034] Figure 9 This is a schematic structural view of the cooling nozzle in the present invention. Detailed implementation manners

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] As Figure 1 and Figure 2 shown, a clamping device for a turbine disk in dovetail groove grinding includes a base, and an offset correction clamping module and a cooling module mounted on the base. The offset correction clamping module is used for clamping the milling disk to be processed and adjusting the position of the axis and side surface of the milling disk. The cooling module is used to provide coolant when a forming grinding wheel 9 processes the dovetail groove of the turbine disk 10.

[0037] The base includes a fixture base 1, a first end cover 2, and a second end cover 14. In the base, the bottom of the fixture base 1 is provided with connection holes for installing and fixing the base. The first end cover 2 and the second end cover 14 are respectively fixedly installed at both ends of the top of the fixture base 1 by screws.

[0038] As Figure 2 and Figure 3 shown, the offset correction clamping module includes a profiling positioning disc 3, a deflection correction mechanism 6, a central shaft 11, a shaft body centering and clamping mechanism 12, a rotary drive motor 13, a coupling 15, a first fixture bearing 16, a locking nut 18, a nut washer 19, a shoulder washer 20, and a second fixture bearing 17.

[0039] Two shaft body centering clamping mechanisms 12 are respectively rotatably connected to the central holes of the first end cover 2 and the second end cover 14 through the first fixture bearing 16 and the second fixture bearing 17. Both ends of the central shaft 11 are clamped on the two shaft body centering clamping mechanisms 12. By loosening the central shaft 11 with the shaft body centering clamping mechanism 12 and axially moving the central shaft 11, the central shaft 11 can be removed, thereby realizing the replacement of the turbine disk 10. The rotary drive motor 13 is fixed to the end of the base, and the output shaft is fixed to one of the shaft body centering clamping mechanisms 12 through a coupling 15; in some embodiments, the shaft body centering clamping mechanism 12 not connected to the rotary drive motor 13 can axially adjust its position, so that the central shaft 11 can be taken out and inserted more conveniently, improving the installation efficiency of the turbine disk 10. Bearing retaining rings for axial positioning are provided on both sides of the first fixture bearing 16 and the second fixture bearing 17.

[0040] The central shaft 11 is in the shape of a stepped shaft with a larger diameter in the middle than at both ends. An external thread is provided on the middle shaft section of the central shaft 11. A limiting shaft section is provided at one end of the middle shaft section. A limiting shaft shoulder is formed on the end face of the limiting shaft section close to the middle shaft section.

[0041] The locking nut 18, the nut washer 19, the profiling positioning disk 3, and the shaft shoulder washer 20 are all sleeved on the central shaft 11 and are arranged in sequence along the direction of the limiting shaft shoulder. The locking nut 18 is screwed onto the external thread on the central shaft 11. The nut washer 19 is arranged between the nut washer 19 and the profiling positioning disk 3. During the working process, the processed turbine disk 10 is clamped between the profiling positioning disk 3 and the limiting shaft shoulder. A shaft shoulder washer 20 is provided between the turbine disk 10 and the limiting shaft shoulder.

[0042] The shape of the side of the profiling positioning disk 3 facing the turbine disk 10 matches the shape of the side of the turbine disk 10, and it can play a role of profiling and fitting positioning before clamping. During the clamping process, one side of the turbine disk is fitted with the profiling positioning disk 3 through the same profile surface, and the other side is connected to the limiting shaft shoulder of the central shaft 11 through the shaft shoulder washer 20. The turbine disk is clamped by the locking nut 18 and the nut washer 19; the turbine disk 10 is fixed. The central shaft is placed between the two shaft body centering clamping mechanisms 12, and the two ends of the central shaft are clamped by the shaft body centering clamping mechanism 12.

[0043] The profiling positioning disk 3 includes a profiling mounting seat 3-1 and a profiling component 3-2. The profiling mounting seat 3-1 and the profiling component 3-2 are fixed by bolts. The side of the profiling component 3-2 facing away from the locking nut 18 is a profiling surface.

[0044] Four mounting grooves are formed on the outer circumferential surface of the profiling positioning disk 3. Four deflection correction mechanisms 6 are respectively mounted in the four mounting grooves and are used to adjust the axis inclination angle of the turbine disk 10 by applying different extrusion displacements to the turbine disk 10, thereby improving the coaxiality between the turbine disk 10 and the central shaft 11. In some embodiments, after clamping is completed, the turbine disk 10 is completely clamped and fixed by the four deflection correction mechanisms 6; at this time, the turbine disk 10 is not in contact with the profiling positioning disk 3, thereby ensuring the effect of the deflection correction mechanism 6 on adjusting the axis inclination angle of the turbine disk 10.

[0045] Such as Figure 4 and Figure 5 As shown, the deflection correction mechanism 6 includes a fixed part and a pushing part. The fixed part includes an upper retaining cover 6-1, a mounting body 6-4 and a first fixing plate 6-9 that are fixed together. The mounting body 6-4 is fixed to the profiling mounting seat 3-1 by fixing screws 6-5. The pushing part includes a sliding extrusion structure, a limit nut 6-6, a pushing bearing 6-8, a spiral block 6-10 and an adjusting rotating shaft 6-7.

[0046] The sliding extrusion structure includes a moving rod 6-2 and a pressing block 6-3. The pressing block 6-3 is fixed to the moving rod 6-2 by screws; the moving rod 6-2 is slidably connected between the upper retaining cover 6-1 and the mounting body 6-4. The sliding extrusion structure can move and push the turbine disk to realize the plane adjustment of the turbine disk. In some embodiments, the side surface of the sliding extrusion structure facing the turbine disk 10 is a profiling surface matching the shape of the turbine disk.

[0047] Both ends of the adjusting rotating shaft 6-7 are rotatably connected to the two first fixing plates 6-9 through the pushing bearings 6-8. The spiral block 6-10 is coaxially fixed to the adjusting rotating shaft 6-7 and is located between the two pushing bearings 6-8. A limit nut 6-6 is screwed and fixed to the end of the adjusting rotating shaft 6-7 close to the pressing block 6-3. Axial limitation is performed between different structures sleeved on the adjusting rotating shaft 6-7 through bearing retaining rings. An internal hexagonal groove is provided at the end of the adjusting rotating shaft 6-7 away from the pressing block 6-3, which is convenient for the user to rotate the adjusting rotating shaft 6-7 through the internal hexagonal groove to realize the position adjustment of the sliding extrusion structure.

[0048] The spiral block 6-10 is provided with an external thread; the moving rod 6-2 is provided with an arc-shaped groove with an internal thread-shaped groove. The external thread on the spiral block 6-10 and the internal thread-shaped groove on the moving rod 6-2 form a screw pair. By rotating the adjusting rotating shaft 6-7, the spiral block 6-10 can be driven to rotate, and then the moving rod 6-2 and the pressing block 6-3 can be driven to move axially to apply a pushing force to the turbine disk 10.

[0049] Such as Figure 6As shown, the shaft body centering clamping mechanism 12 includes a centering main body 12-4, a centering end cover 12-6, and two single-sided clamping structures. The centering end cover 12-6 is fixed on the end face of the centering main body 12-4. Both the centering main body 12-4 and the centering end cover 12-6 are provided with central holes. The two mutually facing single-sided clamping structures are installed in the centering main body 12-4. The single-sided clamping structure includes a clamping threaded hole 12-1, a limiting ring 12-2, a guide rod 12-3, and a V-shaped clamping block 12-5. A limiting ring 12-2 is fixedly embedded between the centering main body 12-4 and the centering end cover 12-6. A guide rod 12-3 is coaxially fixed on the limiting ring 12-2. The V-shaped clamping block 12-5 forms a sliding pair that slides radially with the centering main body 12-4 through the guide rod 12-3. The clamping threaded hole 12-1 is opened on the centering main body 12-4. A radial adjustment screw is threadedly connected in the clamping threaded hole 12-1. The inner end of the radial adjustment screw is rotatably connected to the inner side of the V-shaped clamping block 12-5. By rotating the radial adjustment screw, the V-shaped clamping block 12-5 can be driven to move radially. By rotating the radial adjustment screws on the single-sided clamping structures, the fine adjustment of the axis position of the central shaft 11 can be achieved.

[0050] As Figure 7 shown, the cooling module includes an X-axis moving device 4, a Y-axis moving device 5, a cooling nozzle 7, and a Z-axis moving device 8. The X-axis moving device 4 and the Y-axis moving device 5 adopt linear sliding driven by a motor cooperating with a lead screw. The X-axis moving device 4 is connected to the first end cover 2 by screws; the Y-axis moving device 5 is installed on the sliding structure of the X-axis moving device 4; the Z-axis moving device 8 is installed on the sliding structure of the Y-axis moving device 5. The cooling nozzle 7 is installed on the sliding structure of the Z-axis moving device 8. By the cooperation of the X-axis moving device 4, the Y-axis moving device 5, and the Z-axis moving device 8, the cooling nozzle 7 can be driven to perform translational motion in three degrees of freedom, so as to accurately control the spraying position of the coolant.

[0051] As Figure 8 shown, the Z-axis moving device 8 includes a Z-axis bracket 8-1, a Z-axis driving motor 8-2, a Z-axis driving screw 8-3, a gear 8-4, and a Z-axis slide rail 8-5. The Z-axis driving motor 8-2 is installed on the Z-axis bracket 8-1. The Z-axis slide rail 8-5 is fixed on the Z-axis bracket 8-1. The cooling nozzle 7 is slidably connected to the Z-axis slide rail 8-5. The Z-axis driving screw 8-3 is rotatably connected to the Z-axis bracket 8-1. The cooling nozzle 7 is provided with an internal thread groove. The Z-axis driving screw 8-3 and the internal thread groove on the cooling nozzle 7 form a screw pair. Gears 8-4 are fixedly installed at the output shaft of the Z-axis driving motor 8-2 and the end of the Z-axis driving screw 8-3. The two gears 8-4 are meshed.

[0052] As Figure 9As shown in the figure, the cooling nozzle 7 includes a nozzle body 7-1, a profiling nozzle 7-2, and a nozzle moving structure 7-3. The nozzle moving structure 7-3 is fixed on the nozzle body 7-1. An arc-shaped groove with an internal thread groove on the nozzle moving structure 7-3 is connected to the Z-axis driving screw 8-3 in the Z-axis moving device 8. The profiling nozzle 7-2 is arranged on the side of the nozzle body 7-1. The shape of the profiling nozzle 7-2 matches the unilateral side wall of the turbine disk dovetail groove. Thus, coolant can be provided specifically for the machined position on the dovetail groove.

[0053] In this embodiment, there are two cooling modules in total. The two cooling modules are respectively arranged on the opposite sides of the turbine disk 10. The profiling nozzles 7-2 in the two cooling modules respectively provide coolant for the two side walls of the turbine disk dovetail groove, so that the flow directions of the coolant on the two side walls of the turbine disk dovetail groove are opposite.

[0054] In some embodiments, the rotation direction of the profiling grinding wheel 9 relative to the contact point with the side wall of the turbine disk dovetail groove is opposite to the coolant spraying direction output by the corresponding cooling module. Thus, the rotation directions of the profiling grinding wheel 9 at the two machining positions are both opposite to the coolant flow direction, improving the heat exchange efficiency.

[0055] Based on the turbine disk clamping device for dovetail groove grinding provided in this embodiment, the method for machining the turbine disk dovetail groove is as follows Step 1: After installing the profiling positioning disk 3 and the deflection correction mechanism 6, make the arc surface on the profiling component 3-2 fit with the same arc surface on the turbine disk, so that the turbine disk 10 is above. The central shaft 11 passes through the centers of the turbine disk 10 and the profiling positioning disk 3, and its end surface and the shaft shoulder washer 20 are pressed on one side of the turbine disk, and then a preliminary clamping is performed with the locking nut 18 and the nut washer 19. Both ends of the central shaft 11 are clamped by the shaft body centering clamping mechanism 12; rotate the countersunk head screw in the clamping threaded hole 12-1 to adjust the position of the V-shaped clamping block 12-5, adjust from the maximum clamping range to the minimum, and the two screws clamp the central shaft 11 by turning the same angle.

[0056] Step 2: Select an outer cylindrical surface on the turbine disk as the reference circumferential surface; move the main shaft so that the contact tip of the micrometer is pressed into a part of the reference circumferential surface.

[0057] Drive the turbine disk to rotate slowly for one week through the rotation drive motor 13, with a step of 1°, and record the maximum value of the micrometer readings at different positions on the reference circumferential surface ; Take the position where the maximum value is located as the position with a minimum value at a 180° angular difference ; Calculate the deviation distance between the axis of the turbine disk and the rotation center : If the deviation distance Greater than or equal to 2 C ly , then take the direction from the position of the maximum value to the position of the minimum value as the target adjustment direction; drive the central axis to move a deviation distance in the target adjustment direction through the shaft body centering clamping mechanism 12 . After multiple repeated adjustments, the deviation distance is less than 2 C ly , and the adjustment of the axis center is completed.

[0058] Step 3: Use a micrometer with a precision of 0.001 mm. Fix the base of the micrometer on the machine tool spindle, move the machine tool spindle close to the turbine disk and select a plane with the highest precision as the reference plane. Adjust the position of the indenter of the micrometer, and press the contact tip of the micrometer into the reference plane by a certain amount. Rotate the drive motor 13 to make the turbine disk rotate slowly for one week, with a step of 1°, and record the micrometer readings at different positions on the circumference of the reference plane; Record the maximum value of the micrometer readings at different positions on the reference plane Y max ; Take the position 180° angular difference from the position of the maximum value Y max as the minimum value Y min ; If the obtained deviation amount y s =Y max Y min is greater than or equal to 2Ra, it is judged that the turbine disk has a certain degree of deflection. Where Ra is the surface roughness of the reference plane. Take the two deflection correction mechanisms 6 closest to the position of the minimum value Y min as the used deflection correction mechanisms 6; calculate the adjustment amounts of the two used deflection correction mechanisms 6 y 1, y 2: Among them, θ 1, θ 2 are the angular differences between the two used deflection correction mechanisms 6 and the position of the minimum value Y min respectively Push and adjust the inclination angle of the turbine disk through the two used deflection correction mechanisms 6 to improve the clamping accuracy of the turbine disk. After multiple repeated adjustments, until the range of change in the micrometer readings during one rotation of the turbine disk is less than 2Ra.

[0059] Step 4: After the clamping of the turbine disk is completed, first adjust the Z-axis drive motor 8-2 to move the cooling nozzle 7 to a position close to the side of the turbine disk, and then drive the position of the cooling nozzle 7 through the X-axis moving device 4 and the Y-axis moving device 5, so that the profiling nozzle 7-2 of the cooling nozzle 7 is aligned with the side wall of the turbine disk tenon groove.

[0060] Step 5: Adjust the positions of the two cooling nozzles 7 so that the coolant sprayed by the two cooling nozzles 7 is respectively sprayed onto the two side walls of the turbine disk tenon groove.

[0061] Step 6: Grind the turbine disk tenon groove using a formed grinding wheel that matches the shape of the turbine disk tenon groove. After the grinding of one turbine disk tenon groove is completed, rotate the turbine disk and grind the next turbine disk tenon groove until the grinding of all tenon grooves is completed.

Claims

1. A clamping device for a turbine disk in tenon and groove grinding machining, comprising a base and an offset correction clamping module; characterized in that: The offset correction clamping module comprises a profiling positioning disk (3), a deflection correction mechanism (6), a central shaft (11), a shaft body centering clamping mechanism (12), a rotary drive motor (13) and a locking nut (18); two coaxial and spaced shaft body centering clamping mechanisms (12) are both rotatably connected to the base; the central shaft (11) is clamped between the two shaft body centering clamping mechanisms (12); one of the shaft body centering clamping mechanisms (12) is connected to the rotary drive motor (13); a limited position shaft section is provided on the central shaft (11); the profiling positioning disk (3) is sleeved on the central shaft (11); the side shape of the profiling positioning disk (3) facing the limited position shaft section matches the side shape of the turbine disk (10); the locking nut (18) is provided on a side of the profiling positioning disk (3) away from the limited position shaft section and is threadedly connected to the central shaft (11); The outer circumferential surface of the contoured positioning disk (3) is provided with a plurality of mounting grooves; a deflection correction mechanism (6) is installed in each of the mounting grooves; the deflection correction mechanism (6) comprises a fixed portion and a pushing portion; the pushing portion comprises a sliding extrusion structure, a spiral block (6-10) and an adjusting shaft (6-7); the sliding extrusion structure is slidably connected to the fixed portion; the adjusting shaft (6-7) is rotatably connected to the fixed portion; the spiral block (6-10) is coaxially fixed to the adjusting shaft (6-7); an internal thread groove is provided on the sliding extrusion structure; the external thread on the spiral block (6-10) and the internal thread groove on the sliding extrusion structure form a spiral pair; During operation, the turbine disc is clamped between the contoured positioning disc (3) and the limiting shaft section; the deflection of the turbine disc is corrected by adjusting the degree of squeezing of the turbine disc by the multiple deflection correction mechanisms (6).

2. The clamping device for a turbine disk in tenon groove grinding according to claim 1, characterized in that: The shaft body centering clamping mechanism (12) comprises a centering body (12-4) and two single-sided clamping structures; the two single-sided clamping structures facing each other are installed in the center hole of the centering body (12-4); the single-sided clamping structure comprises a radial adjustment screw and a V-shaped clamping block (12-5); the V-shaped clamping block (12-5) and the centering body (12-4) form a sliding pair that slides radially; the centering body (12-4) is provided with a clamping threaded hole (12-1); a radial adjustment screw is threadedly connected in the clamping threaded hole (12-1); the inner end of the radial adjustment screw is rotatably connected to the V-shaped clamping block (12-5); during operation, by rotating the radial adjustment screw, the V-shaped clamping block (12-5) clamps the center shaft (11) and adjusts the axial position of the center shaft (11).

3. A clamping device for a turbine disk in tenon groove grinding according to claim 2, characterized in that: It also comprises a cooling module; the cooling module comprises a cooling nozzle (7) and a three-axis moving module for driving the cooling nozzle (7) to move.

4. A clamping device for a turbine disk in tenon groove grinding according to claim 3, characterized in that: The shape of the coolant nozzle (7-2) on the cooling nozzle (7) matches the single-sided side wall of the turbine disc groove.

5. A clamping device for a turbine disk in tenon groove grinding machining according to claim 4, characterized in that: There are two cooling modules in total; the two cooling modules are respectively arranged on opposite sides of the turbine disk (10); the coolant nozzles (7-2) in the two cooling modules respectively correspond to the two side walls of the dovetail groove of the turbine disk; during the working process, the two cooling modules respectively spray coolant in opposite directions to the two side walls of the dovetail groove of the turbine disk.

6. The clamping device for a turbine disk in tenon groove grinding according to claim 3, characterized in that: The three-axis moving module includes an X-axis moving device (4), a Y-axis moving device (5) and a Z-axis moving device (8) connected in sequence; the Z-axis moving device (8) includes a Z-axis bracket (8-1), a Z-axis driving motor (8-2), a Z-axis driving screw (8-3) and a Z-axis slide rail (8-5); the Z-axis slide rail (8-5) is fixed on the Z-axis bracket (8-1); the cooling nozzle (7) is slidably connected to the Z-axis slide rail (8-5); the Z-axis driving screw (8-3) is rotatably connected to the Z-axis bracket (8-1); the cooling nozzle (7) is provided with an internal thread groove; the Z-axis driving screw (8-3) and the internal thread groove on the cooling nozzle (7) form a screw pair; the Z-axis driving screw (8-3) is driven to rotate by the Z-axis driving motor (8-2).

7. A clamping device for a turbine disk in tenon groove grinding according to claim 1, characterized in that: A nut washer (19) is provided between the locking nut (18) and the profiling positioning disk (3); a shoulder washer (20) is provided between the limiting shaft section and the turbine disk.

8. A clamping device for a turbine disk in tenon groove grinding according to claim 1, characterized in that: An axial movement adjusting structure is provided between the shaft body centering clamping mechanism (12) not connected to the rotary driving motor (13) and the base.

9. A method for grinding a mortise and tenon groove, characterized in that: Adopt a turbine disk clamping device for dovetail groove grinding processing as described in claim 5, characterized in that it includes the following steps: Step 1: Clamp the turbine disk between the profiling positioning disk (3) and the limiting shaft section, and clamp the central shaft (11) between the two shaft body centering clamping mechanisms (12); rotate the adjusting rotating shaft (6-7) in each deflection correction mechanism (6) so that the sliding extrusion structures in each deflection correction mechanism (6) all abut against the side surface of the turbine disk. Step 2: Take a side surface perpendicular to the axis on the turbine disk as the reference plane, use a measuring tool to abut against the reference plane, drive the turbine disk to rotate one week, and judge whether the turbine disk has deflection according to the change range of the measured value of the measuring tool; if the turbine disk has deflection, rotate the adjusting rotating shaft (6-7) in one or more of the deflection correction mechanisms (6) so that the turbine disk swings under the push of the sliding extrusion structure to correct the deflection of the turbine disk. Step 3: Take an outer cylindrical surface on the turbine disk as the reference circumferential surface, use a measuring tool to abut against the reference circumferential surface, drive the turbine disk to rotate one week, and judge whether the turbine disk has axis eccentricity according to the change range of the measured value of the measuring tool; if the turbine disk has axis eccentricity, adjust the axis position of the central shaft by rotating the radial adjusting screws in the two deflection correction mechanisms (6) to improve the coaxiality between the turbine disk (10) and the central shaft (11). Step 4: Adjust the position of the cooling nozzle (7) through the three-axis moving module so that the profiling nozzles (7-2) in the two cooling modules respectively approach the opposite sides of the dovetail groove to be processed and are respectively aligned with the two side walls of the dovetail groove to be processed. Step 5: The profiling nozzles (7-2) in the two cooling modules eject coolant; the machined dovetail groove on the turbine disk is ground by the profiling grinding wheel (9).

10. A method for grinding a mortise and tenon groove according to claim 9, characterized in that: The rotation direction of the profiling grinding wheel (9) matches the coolant ejection direction of the two profiling nozzles (7-2), so that the linear velocity directions of the profiling grinding wheel (9) at both side walls of the dovetail groove of the turbine disk are opposite to the coolant ejection directions of the corresponding cooling modules.

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