Machining process for inner raceway of workpiece

Abstract

The invention belongs to the field of superfinishing of raceway surfaces, and particularly relates to a process for synchronously finishing machining of an inner raceway and a flange of a workpiece. Workpiece feeding and discharging actions can be completed through the single-shaft mechanical arm, the feeding and discharging plate longitudinally feeds and discharges the workpieces through cooperation of the two blocking strips transversely distributed at the bottom and the longitudinal air cylinder, the operation efficiency is high, the feeding and discharging online effect between two machining stations is better, the structure is more compact, and the practicability is high. And the flange grinding mechanism is used for grinding the flange surface, and the raceway grinding mechanism is used for grinding the raceway surface, so that the synchronous machining operation of the flange and the raceway can be completed through one-time feeding and discharging, the machining efficiency is greatly improved, and the machining precision is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of superfinishing of raceway surfaces, and specifically relates to a process for synchronously machining the inner raceway and the rib of a workpiece. Background Art

[0002] The inner raceway is a mechanical transmission element and is usually used in the strong support link of a bearing system. Its function is to share the load borne by the bearing by providing additional support area and a larger contact angle, reduce friction and wear, and thus extend the service life of the bearing. The inner raceway is mainly used in various types of bearings such as ball bearings, roller bearings, and angular contact ball bearings. During the operation of the bearing, the outer raceway plays a very important role. When the bearing bears a load, the outer raceway can share part of the load, making the bearing run more smoothly, and at the same time, it can also protect the bearing ring from excessive friction and wear. Therefore, the inner raceway is one of the essential important components in the bearing system.

[0003] In the existing inner raceway processing technology, when machining the inner groove of the workpiece, horizontal or vertical centerless roughing, finishing, and superfinishing operations are generally used. When vertical roughing, finishing, and superfinishing operations are used, a loading and unloading manipulator needs to be equipped to realize the loading and unloading operations of the workpiece. To ensure the loading and unloading actions of the workpiece, generally, the workpiece is placed at the processing position by the manipulator and then removed, and then the top pressing member is used to press the top surface of the workpiece against the surface of the driving disk. The driving disk makes a high-speed rotary motion driven by the electric drive spindle, and then cooperates with the oil stone assembly to complete the roughing, finishing, and superfinishing operations of the raceway surface. The loading and unloading operation efficiency of this manipulator is low, and at least a manipulator with three or more axes is required to complete it, which further leads to a higher overall processing cost. And the existing processing technology for the inner raceway and the rib surface of the workpiece is divided into two processes, and the coaxiality of the rib and the raceway surface cannot meet the superfinishing requirements due to multiple clamping operations. Summary of the Invention

[0004] In order to solve the above technical problems, the inventor obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solutions:

[0005] A processing technology for the inner raceway of a workpiece, comprising:

[0006] Step 1, preparation work for workpiece loading

[0007] The bearing steel ring is horizontally transported by the conveying chain plate and is controlled by two stop cylinders independently arranged on the front side of the conveying chain plate to pass through one by one each time;

[0008] The single bearing steel ring passing through is transported by the conveying chain plate to the left side of the limiting plate and adsorbed by the magnetic adsorbent. The limiting plate is located above the conveying chain plate. After adsorption, it moves to the right by the limiting plate and enters between the two stop bars at the bottom surface of the loading and unloading plate. The loading and unloading plate is located above the limiting plate;

[0009] Step 2, longitudinal loading of the workpiece

[0010] The piston rod of the longitudinal cylinder retracts, driving the moving frame and the loading and unloading plate to move backward until the upper and lower positions of the bearing steel ring and the top plate at the rough grinding station correspond to each other;

[0011] Step 3, workpiece pressing

[0012] The pressing cylinder drives the pressing slide plate and the pressing member to move downward. The socket body enters the inside of the bearing steel ring, and the pressing rolling body presses the bearing steel ring on the top plate. Moreover, the restraint at the top of the bearing steel ring is released, and the top plate drives the bearing steel ring to rotate at high speed;

[0013] Step 4, rib and raceway machining

[0014] The rib grinding mechanism grinds the rib surface;

[0015] The raceway grinding mechanism grinds the raceway surface;

[0016] Step 5, re - restraint of the workpiece

[0017] The piston rod of the pressing cylinder retracts, the pressing slide plate and the pressing rolling body move upward, releasing the downward pressing force on the rough - ground bearing steel ring. The spring member acts on the top plate to lift the rough - ground bearing steel ring until the rough - ground bearing steel ring returns to its initial position;

[0018] Step 6, longitudinal unloading of the workpiece

[0019] The piston rod of the longitudinal cylinder moves outward, driving the moving frame and the loading and unloading plate to move forward until the rough - ground bearing steel ring returns above the conveying chain plate again;

[0020] The rough - ground bearing steel ring repeats steps to at the finish grinding station to complete the finish grinding operation.

[0021] In a preferred embodiment, in step 1, a moving table and a position - control cylinder are independently arranged on the front side of the conveying chain plate. The end of the piston rod of the position - control cylinder is installed on the moving table, and the limit plate is installed on the moving table.

[0022] In a preferred embodiment, in step 1, an installation groove is provided at the bottom of the retaining bar. A clamping claw is rotatably installed in the installation groove. One end of the clamping claw contacts the top rib of the bearing steel ring. An arc - shaped guide groove centered on the rotation node of the clamping claw is provided on the side of the installation groove. The depth of the arc - shaped guide groove first decreases and then increases from top to bottom. A limit recess is provided at the lower end of the arc - shaped guide groove. An elastic pin is installed on the side of the clamping claw, and the elastic pin is slidably fitted in the arc - shaped guide groove;

[0023] A sunken groove is provided at the bottom of the loading and unloading plate. An elevating top plate is installed in the sunken groove through an elastic member. A connecting rope is installed at the bottom of the elevating top plate. The free end of the connecting rope penetrates through the retaining bar and enters the installation groove and then is connected to the clamping claw.

[0024] A pulling body that slides back and forth is installed inside the installation groove. One end of the pulling body is exposed outside the installation groove, and the other end is connected to a pulling rope. The pulling rope is connected to the clamping claw. An internal wedge surface is provided on the pulling body located outside the installation groove.

[0025] A vertical rod is installed on the limiting plate. A horizontal member is installed at the top of the vertical rod. A wedge body is provided on one side of the horizontal member opposite to the retaining bar and corresponds to the internal wedge surface in the horizontal position.

[0026] The bottom of the elevating top plate is obliquely downward on the side away from the bearing steel ring.

[0027] In a preferred solution, the piston rod of the position control cylinder retracts, the limiting plate moves the bearing steel ring to the right, the wedge body on the horizontal member acts on the internal wedge surface to move the pulling body outward, and the pulling body rotates the clamping claw downward through the pulling rope until the elastic pin passes through the minimum depth position of the arc-shaped guide groove. Then, the clamping claw rotates downward until the elastic pin and the limiting recess are engaged, and the processed bearing steel ring between the two retaining bars is lowered and falls onto the conveying chain plate, and is moved out of the outside of the loading and unloading plate through the limiting plate.

[0028] The limiting plate moves the bearing steel ring to the position between the two retaining bars through the magnetic body. During the movement, the top of the bearing steel ring will act on the obliquely downward part of the bottom of the elevating top plate, forcing it to rise and compress the elastic member. The elevating top plate moves upward and drives the clamping claw to move upward through the connecting rope, and forces the elastic pin to disengage from the limiting recess. When the elastic pin passes through the minimum depth position of the arc-shaped guide groove, the elastic pin will slowly clamp the new bearing steel ring in cooperation with the depth change of the arc-shaped guide groove, and finally complete the clamping and lifting actions of the bearing steel ring. The top surface of the bearing steel ring is in contact with the bottom surface of the loading and unloading plate. At this time, the top plate and the bearing steel ring are in corresponding front and rear positions.

[0029] In a preferred solution, in the step, the bottom of the top plate is connected to the driving disk through a spring member, and the driving spindle is installed at the bottom of the driving disk.

[0030] A rear positioning arc-shaped seat is independently provided at the rear of the top plate. Two groups of adjusting support rollers are radially installed on the rear positioning arc-shaped seat.

[0031] In a preferred solution, in step 3, during the downward pressing process, the top plate moves downward and compresses the spring member. At the same time, the bearing steel ring actively moves downward, the clamping claw turns downward, and the elastic pin moves downward along the arc-shaped guide groove. After passing through the minimum depth position of the arc-shaped guide groove, the elastic pin will continue to move downward slowly in cooperation with the depth change of the arc-shaped guide groove until the clamping claw is separated from the bearing steel ring, and finally the elastic pin and the limiting recess are adapted.

[0032] In a preferred embodiment, in step 3, when the spring member acts on the top plate to lift the rough-ground bearing steel ring, the elastic pin will be disengaged from the limit recess first, and the clamping claws will turn upwards. After the elastic pin passes through the minimum depth of the arc-shaped guide groove, the elastic pin will re-clamp the rough-ground bearing steel ring in combination with the depth change of the elastic pin, and the top surface of the rough-ground bearing steel ring will be attached to the bottom surface of the loading and unloading plate.

[0033] In a preferred embodiment, the rib grinding mechanism includes a transverse slide, and a rib grinding seat is installed on the top of the transverse slide. A rib grinding assembly is installed on the rib grinding seat through an angle adjustment structure;

[0034] The raceway grinding mechanism includes a raceway grinding slide, and an adjustment frame is installed on the top of the raceway grinding slide. A raceway grinding seat and an adjustment component for adjusting the angle of the raceway grinding seat are installed on the adjustment frame, and a raceway grinding assembly is installed on the raceway grinding seat.

[0035] In a preferred embodiment, the angle adjustment structure includes a worm and a worm gear installed on the rib grinding seat. The worm and the worm gear are matched. A driving gear is installed on the rotating shaft of the worm gear. An operating rod is arranged at one end of the worm. An arc-shaped rack meshing with the driving gear is installed on the rib grinding assembly. An arc-shaped notch is installed on the rib grinding seat, and a pressing bolt is installed in the arc-shaped notch. The pressing bolt is installed on the rib grinding assembly;

[0036] Both the grinding drive assembly one and the grinding drive assembly two are fixed seats. A servo motor is installed on the fixed seat. The output end of the servo motor is installed with an eccentric drive shaft. One end of the eccentric drive shaft is rotatably installed on the fixed seat. An eccentric sleeve, an adjustment sleeve and a locking nut are installed on the eccentric drive shaft. A rolling body is installed on the outside of the eccentric sleeve. The adjustment sleeve is axially slidably matched with the eccentric drive shaft and the side in contact with the eccentric sleeve is a ring gear surface. The locking nut is used to squeeze the adjustment sleeve so that the corresponding ends of the eccentric sleeve and the adjustment sleeve are in contact and remain relatively stationary;

[0037] A moving frame is sleeved on the outside of the rolling body. The moving frame is slidably matched with the fixed seat. The moving frame is used to install the rib grinding assembly or the raceway grinding part. A guide body is installed on the fixed seat and one end of the guide body is inserted into the moving frame. An elastic body is sleeved on the outside of the guide body;

[0038] The rib grinding assembly includes a mounting plate installed on the moving frame through a rotating shaft. An angle adjustment groove is arranged on the moving frame. The mounting plate is restricted from relative movement with respect to the moving frame by a locking bolt in the angle adjustment groove. An adjustment screw is rotatably installed on the moving frame. The adjustment screw is used to adjust the angle of the mounting plate relative to the moving frame. The mounting plate is used to install the rib grinding part.

[0039] In a preferred embodiment, the rib grinding mechanism grinds the rib surface as follows:

[0040] It is necessary to adjust in advance so that the machining center of the edge grinding part coincides with the center of the edge surface to be machined. The servo motor of the edge grinding mechanism drives the eccentric drive shaft to rotate, driving the eccentric sleeve and the rolling elements to rotate, driving the moving frame to make high-frequency reciprocating motion along the fixed seat. During the motion, the elastic body always keeps the moving frame and the rolling elements in close contact, and the edge grinding part performs rough grinding on the edge surface;

[0041] The raceway grinding mechanism grinds the raceway surface as follows:

[0042] Adjust in advance so that the machining center of the raceway grinding part coincides with the center of the raceway surface to be machined. The servo motor of the raceway grinding mechanism drives the eccentric drive shaft to rotate, driving the eccentric sleeve and the rolling elements to rotate, driving the moving frame to make high-frequency reciprocating motion along the fixed seat. During the motion, the elastic body always keeps the moving frame and the rolling elements in close contact, and the raceway grinding part performs rough grinding on the raceway surface.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention can complete the workpiece loading and unloading actions by using a single-axis manipulator. The loading and unloading plate uses two longitudinally distributed bottom bars and a longitudinal cylinder to perform longitudinal loading and unloading operations on the workpiece. The operation efficiency is high, and the connection effect between the two processing stations and the loading and unloading connection line is better. The structure is more compact. Also, through the edge grinding mechanism for edge surface grinding and the raceway grinding mechanism for raceway surface grinding, the synchronous processing of the edge and the raceway can be completed in one loading and unloading, greatly improving the processing efficiency and ensuring the processing accuracy.

[0045] 2. During actual application, the inventor also found that although using only two retaining bars to achieve the workpiece loading and unloading action can solve the above problems, some other problems will still occur. For example, accurately transporting the outer wall of the workpiece to the processing station and ensuring that the outer wall fits on the surface of the adjusting support roller will cause the front retaining bar to exert a certain degree of pushing force on the workpiece. Due to the existence of this pushing force, during the rough, finish, and super-finish operations on the raceway surface of the workpiece, relative movement will occur between the retaining bar and the outer wall of the workpiece, inevitably resulting in wear of the contact surface. If the hardness of the retaining bar is higher than that of the workpiece, the outer wall of the workpiece will be damaged. If the hardness of the retaining bar is lower than that of the workpiece, the retaining bar will wear, which will further cause inaccurate feeding in the subsequent process and thus unable to ensure the super-finishing accuracy of the workpiece. The inventor solved this problem by setting clamping claws in the middle of the two retaining bars, using the wedge-shaped body on the horizontal cross bar of the limiting plate to release the workpiece from the clamping claws or actively separating the workpiece from the clamping claws by the downward pressure of the pressing rolling body (self-aligning bearing), and then using the spring on the driving disk to reset the workpiece after the downward pressure of the pressing rolling body is released. Finally, the top surface of the bearing steel ring is constrained to fit against the bottom surface of the loading and unloading plate through the clamping claws, or using the magnetic attraction of the magnetic body to adsorb the workpiece and the upward movement of the lifting plate to realize the workpiece clamping operation under the synergistic action of the elastic pin and the depth of the arc-shaped guide groove, thus solving the above problems.

[0046] 3. The present invention uses a self-aligning bearing to achieve floating pressing on the end face of the workpiece to ensure the coaxiality of the raceway surface.

[0047] 4. The present invention makes a high-frequency reciprocating motion for the oilstone assembly. By using a servo motor to drive the eccentric drive shaft, eccentric sleeve, and rolling parts to drive the moving frame to make a high-frequency reciprocating motion, and using the annular tooth surface between the pressing sleeve and the eccentric sleeve to adjust the stroke of the moving frame, and using a locking nut to limit the adjusting sleeve, the adjustability of the stroke can be ensured, thus adapting to the processing of raceways with different width specifications.

[0048] 5. The present invention can also adjust the angle of the raceway grinding part, and use the worm gear seat and worm shaft transmission and the worm shaft and adjusting shaft transmission to complete the rough, finish, and super-finish processing operations of the raceway grinding part. At the same time, the bottom of the adjusting frame uses a raceway grinding slide (servo linear slide) to realize the lateral position adjustment of the raceway grinding part, thus adapting to the processing of workpieces with different size specifications.

[0049] 6. Since the rolling elements are located inside the moving frame, there must be a certain gap between them and the inner wall of the moving frame during assembly. However, this gap will cause the edge grinding parts or raceway grinding parts to vibrate during high-frequency reciprocating motion, and there will be impacts at the commutation poles. Moreover, the inertia is very large, which will affect the machining accuracy of the edge or raceway surface. The inventor ensures that the outer wall of the rolling elements and the inner wall of the moving frame always remain in close contact by setting an elastic body between the moving frame and the mounting plate. Secondly, it can also solve the problem of large inertia at the commutation pole position. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0051] Figure 2 is a schematic diagram of the overall structure of the present invention without the loading and unloading mechanism installed;

[0052] Figure 3 is a position distribution diagram of the edge grinding mechanism, raceway grinding mechanism, and servo electric drive spindle of the present invention;

[0053] Figure 4 is a schematic diagram of the overall structure of the edge grinding mechanism of the present invention;

[0054] Figure 5 、 Figure 6 is a schematic diagram of the structure of the edge grinding assembly of the present invention from two perspectives;

[0055] Figure 7 is a schematic diagram of the overall structure of the raceway grinding mechanism of the present invention;

[0056] Figure 8 is a schematic diagram of the structure on the fixed seat of the present invention;

[0057] Figure 9 is Figure 8 the front view of

[0058] Figure 10 is Figure 9 the sectional view taken along line A-A in

[0059] Figure 11 is a schematic diagram of the overall structure of the pressing component of the present invention;

[0060] Figure 12 is a schematic diagram of the overall structure of the loading and unloading mechanism of the present invention;

[0061] Figure 13 is a structural diagram of the rear positioning arc seat of the present invention;

[0062] Figure 14 、 Figure 15 is a structural diagram of the loading and unloading component of the present invention from two different perspectives;

[0063] Figure 16 Front and rear sectional views when the clamping jaws of the present invention clamp the bearing steel ring;

[0064] Figure 17 It is Figure 16 Partial enlarged view of the position A in;

[0065] Figure 18 It is Figure 17 Diagram of the state where the clamping jaws release the bearing steel ring in;

[0066] Figure 19 Side view of the clamping jaws;

[0067] Figure 20 Overall structure diagram of the lifting top plate;

[0068] Figure 21 Structure diagram of the position control component

[0069] Figure 22 Connection relationship diagram of the driving main shaft and the driving disc.

[0070] In the figure:

[0071] 100, Loading and unloading mechanism; 110, Conveyor chain plate; 111, Stop air cylinder; 112, Moving table; 113, Position control air cylinder; 114, Limit plate; 1141, Vertical rod; 1142, Horizontal horizontal member; 1143, Wedge body; 115, Magnetic body; 120, Loading and unloading component; 121, Longitudinal air cylinder; 122, Moving frame; 123, Loading and unloading plate; 1231, Elastic member; 1232, Lifting top plate; 1233, Connecting rope; 124, Stop bar; 1241, Installation groove; 1242, Clamping jaw; 1243, Arc-shaped guide groove; 1244, Limit recess; 1245, Elastic pin; 1246, Pulling body; 1247, Pulling rope;

[0072] 200, Flange grinding mechanism; 210, Transverse sliding table; 220, Flange grinding seat; 230, Flange grinding component; 231, Flange grinding assembly; 232, Fixed seat; 233, Servo motor; 234, Eccentric drive shaft; 235, Eccentric sleeve; 236, Adjusting sleeve; 237, Locking nut; 238, Rolling body; 239, Moving frame; 2310, Guide body; 2311, Mounting plate; 2312, Angle adjustment groove; 2313, Locking bolt; 2314, Adjusting screw; 2315, Elastic body; 2316, Flange grinding part; 240, Angle adjustment structure; 241, Operating rod; 242, Driving gear; 243, Arc-shaped rack; 244, Arc-shaped notch; 245, Compression bolt;

[0073] 300. Raceway grinding mechanism; 310. Raceway grinding slide; 320. Adjustment frame; 330. Raceway grinding seat; 340. Adjustment component; 341. Operating shaft; 342. Worm shaft; 343. Worm gear seat; 350. Raceway grinding assembly; 351. Raceway grinding part;

[0074] 400. Pressing-down component; 410. Upright frame; 420. Pressing-down slide plate; 430. Pressing-down cylinder; 440. Pressing-down part; 441. Socket body; 442. Pressing-down rolling element;

[0075] 500. Servo motor-driven main shaft; 501. Rear positioning arc seat; 502. Adjusting support roller; 503. Driving main shaft; 504. Driving disc; 505. Spring part; 506. Top disc. Detailed implementation manner

[0076] As Figure 1 、 2 shown in FIGS. 3, 4, 7, and 11, the multi-functional raceway vertical double-station super-precision grinding machine includes two processing units symmetrically distributed horizontally. Each of the processing units includes:

[0077] The rib grinding mechanism 200 includes a horizontal slide 210. A rib grinding seat 220 is installed on the top of the horizontal slide 210. A rib grinding assembly 230 is installed on the rib grinding seat 220 through an angle adjustment structure 240. The inclination angle of the rib grinding processing surface is adjusted through the angle adjustment structure 240. The horizontal slide 210 is used to adjust the horizontal position of the rib grinding seat 220 to approach or move away from the bearing steel ring.

[0078] The raceway grinding mechanism 300 includes a raceway grinding slide 310. An adjustment frame 320 is installed on the top of the raceway grinding slide 310. A raceway grinding seat 330 and an adjustment component 340 for adjusting the angle of the raceway grinding seat 330 are installed on the adjustment frame 320. A raceway grinding assembly 350 is installed on the raceway grinding seat 330; the raceway grinding slide 310 is used to horizontally adjust the position of the adjustment frame 320 to approach or move away from the bearing steel ring, and the adjustment component 340 is used to adjust the inclination angle of the raceway grinding seat 330 relative to the bearing steel ring, so as to realize the grinding operation of raceway surfaces at different angles.

[0079] The servo motor-driven mechanism includes a servo motor-driven main shaft 500 located in the lower area of the grinding station and a pressing-down component 400 located in the upper area of the grinding station. The pressing-down component 400 is used to press on the top end face of the bearing steel ring. The pressing-down component 400 presses the bearing steel ring onto the servo motor-driven main shaft 500 and drives it to rotate at high speed through the servo motor-driven main shaft 500. Then, the rib grinding mechanism 200 and the raceway grinding mechanism 300 respectively perform processing operations on it.

[0080] Based on the above solution, the angle adjustment structure 240 includes a worm and a worm gear mounted on the rib grinding seat 220. The worm and the worm gear are engaged. A driving gear 242 is mounted on the rotating shaft of the worm gear. One end of the worm is provided with an operating rod 241. An arc-shaped rack 243 engaged with the driving gear 242 is mounted on the rib grinding assembly 230. An arc-shaped notch 244 is mounted on the rib grinding seat 220. A compression bolt 245 is mounted in the arc-shaped notch 244, and the compression bolt 245 is mounted on the rib grinding assembly 230. By rotating the operating rod 241, the arc-shaped rack 243 is driven to rotate a certain angle by the driving gear 242. Due to the self-locking of the worm and the worm gear, it can remain relatively stable after the angle is adjusted. After adjusting the angle, in order to ensure the stability of the rib grinding assembly 230 relative to the rib grinding seat 220, the position and angle limiting operations are completed through the compression bolt 245.

[0081] Based on the above solution, as Figures 3 to 7 shown, the rib grinding assembly 230 includes a grinding drive assembly one and a rib grinding assembly 231, and the raceway grinding assembly 350 includes a grinding drive assembly two and a raceway grinding part 351;

[0082] As Figures 8 to 10 shown, both the grinding drive assembly one and the grinding drive assembly two are fixed to the seat 232. A servo motor 233 is mounted on the fixed seat 232. The output end of the servo motor 233 is provided with an eccentric drive shaft 234. One end of the eccentric drive shaft 234 is rotatably mounted on the fixed seat 232. An eccentric sleeve 235, an adjusting sleeve 236 and a locking nut 237 are mounted on the eccentric drive shaft 234. A rolling body 238 is mounted on the outer side of the eccentric sleeve 235. The adjusting sleeve 236 is axially slidably fitted on the eccentric drive shaft 234 and the side in contact with the eccentric sleeve 235 is an annular tooth surface. The locking nut 237 is used to squeeze the adjusting sleeve 236 so that the corresponding ends of the eccentric sleeve 235 and the adjusting sleeve 236 are in contact and remain relatively stationary;

[0083] A moving frame 239 is sleeved on the outer side of the rolling body 238. The moving frame 239 is slidably fitted on the fixed seat 232. The moving frame 239 is used to mount the rib grinding assembly 231 or the raceway grinding part 351. A guide body 2310 is mounted on the fixed seat 232 and one end of the guide body 2310 is inserted into the moving frame 239. An elastic body 2315 is sleeved on the outer side of the guide body 2310.

[0084] Since it is necessary to adjust the stroke of the moving frame 239 when processing the ribs and raceway surfaces of different widths, first unlock the lock nut 237 to release the extrusion force on the adjusting sleeve 236. The adjusting sleeve 236 slides axially relative to the eccentric drive shaft 234 to adjust, and the angle of the eccentric sleeve 235 relative to the eccentric drive shaft 234 is adjusted by a certain amount. Then, the angle of the eccentric sleeve 235 is restricted through the annular tooth surface by the adjusting sleeve 236. Finally, the lock nut 237 presses and fixes it, thereby completing the adjustment of the eccentricity and finally completing the adjustment of the stroke.

[0085] Based on the above solution, as Figure 4 and Figure 5 shown, the rib grinding assembly 231 includes a mounting plate 2311 installed on the moving frame 239 through a rotating shaft. An angle adjustment groove 2312 is provided on the moving frame 239. The mounting plate 2311 restricts the angle of the mounting plate 2311 relative to the moving frame 239 through the locking bolt 2313 in the angle adjustment groove 2312. An adjusting screw rod 2314 is rotatably installed on the moving frame 239. The adjusting screw rod 2314 is used to adjust the angle of the mounting plate 2311 relative to the moving frame 239. The mounting plate 2311 is used to install the rib grinding part 2316. Loosen the locking bolt 2313, and then adjust the position and angle of the mounting plate 2311 through the adjusting screw rod 2314. After rotating the rib grinding part 2316 by a certain angle with the rotating shaft as the center and adjusting by a certain angle, then use the locking bolt 2313 for locking and fixing.

[0086] Based on the above solution, as Figure 7 shown, the adjusting component 340 includes an operating shaft 341, a worm shaft 342, and a worm gear seat 343. The operating shaft 341 forms a transmission fit with the worm shaft 342 through gear transmission, and the worm shaft 342 forms a transmission fit with the worm gear seat 343. The worm gear seat 343 is rotatably installed on the adjusting frame 320 and fixed on the raceway grinding seat 330. The angle of the raceway grinding seat 330 is adjusted by adjusting the angle of the worm gear seat 343 through the operating shaft 341 via gears and the worm shaft 342.

[0087] Based on the above solution, as Figure 11 shown, the pressing component 400 includes a vertical frame 410. Pressing sliding plates 420 arranged vertically are installed on both sides of the vertical frame 410. A pressing cylinder 430 is installed on the top of the pressing sliding plate 420. The piston end of the pressing cylinder 430 and the pressing sliding plate 420, and a pressing part 440 is installed on the pressing sliding plate 420. A socket body 441 inserted into the inner part of the bearing steel ring and a pressing rolling body 442 (self-aligning bearing) pressed on the top surface of the bearing steel ring are provided at the bottom of the pressing part 440. The pressing cylinder 430 drives the pressing sliding plate 420 and the pressing part 440 to move downward, and the bearing steel ring is pressed against the top surface of the top plate 506 of the servo electric drive spindle 500 through the pressing rolling body 442.

[0088] Based on the above solution, as Figure 13 shown, a rear positioning arc seat 501 is independently arranged at the rear side of the servo electric drive spindle 500. The center of the rear positioning arc seat 501 is on the axis of the servo electric drive spindle 500, and two radially arranged adjusting support rollers 502 are installed on the rear positioning arc seat 501.

[0089] As Figure 22 shown, the servo electric drive spindle 500 includes a driving spindle 503, a driving disk 504, and a top disk 506 installed on the top of the driving disk 504 through a spring member 505. The driving spindle 503 drives the driving disk 504 to rotate. The top disk 506 axially slides relative to the driving disk 504 through the spring member 505, and a certain amount of downward movement of the bearing steel ring is realized under the extrusion of the downward pressing rolling body 442.

[0090] Based on the above solution, as Figure 1 shown, a loading and unloading mechanism 100 arranged horizontally is independently arranged at the front side of the processing unit; the loading and unloading mechanism 100 is used to realize the connection of two vertical processing units.

[0091] As Figure 12 shown, the loading and unloading mechanism 100 includes a horizontally arranged conveying chain plate 110 and two sets of loading and unloading components 120 corresponding to the processing unit respectively. Two sets of material blocking components and position control components are arranged on the side of the conveying chain plate 110. The material blocking component includes two material blocking cylinders 111 arranged side by side, and the material blocking cylinder 111 is used to control the passage of a single bearing steel ring each time.

[0092] As Figure 21 shown, the position control component includes a moving table 112 and a position control cylinder 113 independently arranged at the front side of the conveying chain plate 110. A limiting plate 114 spanning the conveying chain plate 110 is installed on the top of the moving table 112. A magnetic body 115 is installed on the side of the limiting plate 114 facing the bearing steel ring. When the magnetic body 115 moves horizontally, it can drive the effective synchronous movement of the bearing steel ring, and at the same time, it can also squeeze the lifting top plate 1232 to move upward. The piston rod of the position control cylinder 113 is installed on the moving table 112, and the position control cylinder 113 is used to move the limiting plate 114 horizontally. When a single bearing steel ring conveyed by the material blocking cylinder 111 is adsorbed by the magnetic body 115, the magnetic body 115 is used to synchronously move the bearing steel ring until the front and rear positions of the bearing steel ring and the processing station coincide, and it also enters between two stoppers 124.

[0093] As Figure 14 and 15As shown in the figure, the loading and unloading assembly 120 includes a longitudinal cylinder 121 independently arranged below the conveying chain plate 110. A moving frame 122 is installed on the piston rod of the longitudinal cylinder 121. A loading and unloading plate 123 is installed on the moving frame 122. The loading and unloading plate 123 is located above the conveying chain plate 110 and the limiting plate 114. Two notches one arranged front and back and two notches two arranged left and right are installed on the loading and unloading plate 123. A retaining bar 124 is installed at the bottom of the loading and unloading plate 123. After the bearing steel ring enters between the two retaining bars 124, the longitudinal cylinder 121 is used to move the bearing steel ring back and forth through the moving frame 122, and then the bearing steel ring is loaded onto the top plate 506 through the loading and unloading plate 123. After the pressing rolling body 442 presses down the bearing steel ring, the bearing steel ring can be separated from the retaining bar 124.

[0094] On the basis of the above solution, when the loading and unloading plate loads the bearing steel ring to the processing station, since the adjusting support roller is located below the loading and unloading plate, it is impossible to ensure that the bearing steel ring is exactly horizontally conveyed to the processing station. That is, when the bearing steel ring is at the processing station, on the one hand, the bottom side wall of the bearing steel ring cannot effectively fit on the adjusting support roller; on the other hand, the top side wall of the bearing steel ring excessively presses the side wall of the front retaining bar, resulting in eccentricity during the grinding operation, and then causing coaxiality problems with the rib, raceway surface and inner diameter, or the side wall of the retaining bar applies resistance to the top of the bearing steel ring, causing horizontal eccentric swing during the rotation of the bearing steel ring, and then affecting the machining accuracy of the bearing steel ring. Therefore, the following improvements are made:

[0095] As Figures 16 - 18 shown in the figure, an installation groove 1241 is arranged at the bottom of the retaining bar 124. A clamping jaw 1242 is rotatably installed in the installation groove 1241. One end of the clamping jaw 1242 contacts the top rib of the bearing steel ring. An arc-shaped guide groove 1243 centered on the rotation node of the clamping jaw 1242 is arranged at the side of the installation groove 1241. The depth of the arc-shaped guide groove 1243 first decreases and then increases from top to bottom. A limiting recess 1244 is arranged at the lower end of the arc-shaped guide groove 1243. An elastic pin 1245 is installed on the side of the clamping jaw 1242. The elastic pin 1245 is slidably matched in the arc-shaped guide groove 1243;

[0096] A sunken groove is arranged at the bottom of the loading and unloading plate 123. A lifting top plate 1232 is installed in the sunken groove through an elastic member 1231. A connecting rope 1233 is installed at the bottom of the lifting top plate 1232. The free end of the connecting rope 1233 passes through the retaining bar 124 and enters the installation groove 1241 and then is connected to the clamping jaw 1242;

[0097] Inside the installation groove 1241, a pulling body 1246 that slides back and forth is installed. One end of the pulling body 1246 is exposed outside the installation groove 1241, and the other end is connected to a pulling rope 1247. The pulling rope 1247 is connected to the clamping claw 1242. An internal wedge surface is provided on the pulling body 1246 located outside the installation groove 1241.

[0098] A vertical rod 1141 is installed on the limit plate 114. At the top of the vertical rod 1141, a horizontal member 1142 is installed. On the side of the horizontal member 1142 opposite to the retaining strip 124, a wedge-shaped body 1143 is provided and is horizontally positioned corresponding to the internal wedge surface.

[0099] The bottom of the lifting top plate 1232 is inclined downward on the side away from the bearing steel ring.

[0100] When the limit plate 114 moves horizontally, first, the internal wedge surface is acted on by the wedge-shaped body 1143 to move the pulling body 1246 outward. Through the pulling rope 1247, the clamping claw 1242 is rotated downward, and then the processed bearing steel ring between the two retaining strips 124 is lowered and falls onto the conveying chain plate 110. Then, the limit plate 114 moves horizontally out of the right side of the retaining strip 124. At the same time, the magnetic body 115 on the left drives the bearing steel ring to move horizontally. The bearing steel ring will squeeze the inclined downward position at the bottom of the lifting top plate 1232, causing the lifting top plate 1232 to move upward and compress the elastic member 1231. At the same time, through the connecting rope 1233, the clamping claw 1242 is moved upward. First, the elastic pin 1245 is disengaged from the limit recess 1244 and passes through the position with the minimum depth of the arc-shaped guide groove 1243. Then, the elastic pin 1245 will cooperate with the depth structure of the arc-shaped guide groove 1243 to complete the automatic upward movement of the clamping claw 1242 until the upper edge of the bearing steel ring is clamped, and the bearing steel ring is lifted to a certain height to be separated from the conveying chain plate 110 until the top fits against the bottom surface of the loading and unloading plate 123. Finally, the clamping claw 1242 clamps the bearing steel ring front and back.

[0101] It moves backward through the loading and unloading plate 123, feeds the bearing steel ring to the top of the top plate 506, and the side is attached to the adjusting support roller 502. The pressing rolling element 442 presses down on the top surface of the bearing steel ring. As the bearing steel ring moves downward, the bearing steel ring will move downward, and the clamping claw 1242 rotates downward. When the elastic pin 1245 moves downward through the minimum depth of the arc-shaped guide groove 1243, the elastic pin 1245 will continue to move downward in cooperation with the depth change of the arc-shaped guide groove 1243 until the clamping claw 1242 separates from the upper edge of the bearing steel ring. During this process, the top plate 506 will move downward to compress the spring member 505, and the top of the bearing steel ring will also separate from the lifting top plate 1232, and the edge and raceway surface processing operation will be carried out. After the processing is completed, the pressing force of the pressing rolling element 442 is released, and the spring member 505 moves the top plate 506 and the bearing steel ring upward until the top surface of the bearing steel ring acts on the lifting top plate 1232 to move upward. Through the connecting rope 1233, the clamping claw 1242 moves upward until the elastic pin 1245 passes through the minimum depth position of the arc-shaped guide groove 1243, and the clamping claw 1242 will continue to move upward to re-clamp the bearing steel ring and make the top surface fit against the bottom surface of the loading and unloading plate 123. The loading and unloading plate 123 conveys the bearing steel ring forward until it returns above the conveying chain plate 110 again.

[0102] The above-mentioned multi-functional raceway vertical double-station super-precision grinding machine is used to solve the following problems existing in the existing equipment for grinding the inner ring edge and raceway of bearings:

[0103] 1. When the existing edge and raceway grinding equipment performs super-precision operation on the inner ring of the bearing, it does not have the ability to adjust the grinding angles of the edge and raceway;

[0104] 2. When the existing edge and raceway grinding equipment performs super-precision operation on the inner ring of the bearing, it does not have the ability to adjust the grinding stroke amounts of the edge and raceway;

[0105] 3. When the existing edge and raceway grinding equipment, especially when realizing vertical roughing, precision and super-precision operations for double stations, it lacks a loading and unloading device that can be used to better connect the double stations.

[0106] Compared with the prior art, the above-mentioned multi-functional raceway vertical double-station super-precision grinding machine has the following beneficial effects:

[0107] 1. One-time clamping is adopted to complete the processing operations of the rib and raceway surface of the inner ring. The pressing roller (self-aligning bearing) of the pressing component at the top presses the inner ring onto the servo-electric drive spindle. The servo-electric drive spindle drives the inner ring to rotate. While rotating, the rib grinding mechanism grinds the rib on the left side, and the raceway grinding mechanism grinds the raceway surface on the right side, finally completing the rough and finish grinding operations. The driving parts of the raceway grinding mechanism and the rib grinding mechanism adopt a combined structure of an eccentric drive shaft and an eccentric sleeve to realize the reciprocating motion of the grinding parts (oilstones). When the widths of the rib and the raceway surface are different, the stroke of the oilstone can also be adaptively adjusted by adjusting the angular stagger of the eccentric sleeve relative to the eccentric drive shaft, thereby completing the processing operations of ribs and raceway surfaces with different widths. At the same time, compared with the traditional swing-arm drive method, the overall vibration inertia can be reduced. An elastic body is arranged between the moving frame and the fixed seat to ensure that the moving frame and the roller are always in close contact, reducing its vibration and the inertia at the commutation poles. The friction between the two can be effectively reduced through the roller (bearing). At the same time, angle adjustment structures are provided on both the raceway grinding mechanism and the rib grinding mechanism to adaptively adjust the inclination angles of the rib grinding parts and the raceway surface grinding components relative to the bearing steel ring, so as to complete the processing operations of the rib and raceway surface of the bearing steel ring at different angles.

[0108] 2. By sleeving a roller (bearing) outside the eccentric sleeve and using the roller to drive the corresponding structure to realize reciprocating motion, and cooperating with a spring part to ensure that the outer peripheral surface of the bearing and the corresponding structure are always in contact without abnormal noise and vibration, ensuring the quality and accuracy of the grinding surface.

[0109] 3. Double stations are adopted to realize rough and finish vertical machining. The loading and unloading mechanism is used to achieve better connection operation between the double stations, making the structure more compact.

[0110] 4. Targeted improvements are also made to the conveying mechanism. Instead of using loading and unloading channels and transfer manipulators to achieve loading and unloading, a conveying chain plate and a longitudinally reciprocating loading and unloading plate are used to complete the loading and unloading actions of the inner ring, thereby completing the conveying of the inner ring and the loading and unloading actions of freely switching between the conveying chain plate and the processing station. By realizing connection in a simpler way, the equipment space is also rationally arranged.

[0111] 5. When the loading and unloading plate of the present invention feeds the bearing steel ring to the processing station, since the adjusting support roller is located below the loading and unloading plate, it is impossible to ensure that the bearing steel ring is exactly horizontally conveyed to the processing station. That is, when the bearing steel ring is at the processing station, on the one hand, the bottom side wall of the bearing steel ring cannot effectively fit on the adjusting support roller; on the other hand, the top side wall of the bearing steel ring excessively presses the side wall of the front baffle, resulting in eccentricity during the grinding operation, which in turn causes coaxiality problems with the rib, raceway surface, and inner diameter. Or, the side wall of the baffle applies resistance to the top of the bearing steel ring, causing horizontal eccentric swing during the rotation of the bearing steel ring, thereby affecting the machining accuracy of the bearing steel ring. Therefore, the present invention provides clamping claws arranged in the front-back direction on the baffle. By using the actions of the clamping claws to release the bearing steel ring, clamp, and lift the bearing steel ring under different working conditions, after feeding to the processing station, due to the downward pressure of the upper pressing rolling body on the top of the bearing steel ring, and at the same time the lower top plate will sink a certain distance (compressing the spring member), the clamping claws will disengage from the lower side wall of the top rib. The clamping claws will be driven to the limiting recess and restricted by the elastic pin to achieve separation from the bearing steel ring, thereby releasing the acting force to solve the eccentricity problem caused by resistance during grinding. When each processing is completed, with the release of the acting force of the pressing rolling body, the lower top plate will act on the bearing steel ring to be clamped by the clamping claws again under the action of the spring member, and then be sent back above the conveying chain plate by the loading and unloading plate. By using the wedge-shaped body of the horizontal horizontal rod on the limiting plate to act on the pulling body, the clamping claws are opened again, thereby releasing the processed bearing steel ring, and the processed bearing steel ring is removed from between the two baffles under the action of the limiting plate. The new bearing steel ring enters between the two baffles, and the top of the bearing steel ring acts on the lifting top plate through the pulling of the magnetic attracting body to complete the clamping and lifting. The processed bearing steel ring is conveyed to the next station by the conveying member.

[0112] A processing process for the inner raceway of a workpiece, using the above-mentioned multi-functional vertical double-station super-precision grinding machine for raceways. The process steps include:

[0113] Step 1, workpiece loading preparation

[0114] The bearing steel ring is horizontally conveyed by the conveying chain plate 110 and controlled by two stop cylinders 111 to pass through one by one each time. The single passing bearing steel ring is conveyed by the conveying chain plate 110 to the left side of the limiting plate 114 and adsorbed by the magnetic attracting body 115;

[0115] The piston rod of the position control cylinder 113 retracts, the limit plate 114 moves the bearing steel ring to the right, the wedge body 1143 on the transverse horizontal rod 1142 acts on the built-in wedge surface to move the pulling body 1246 outward, and the pulling body 1246 moves the clamping jaw 1242 downward through the pulling rope 1247 until the elastic pin 1245 passes through the minimum depth position of the arc-shaped guide groove 1243, and then the clamping jaw 1242 rotates downward until the elastic pin 1245 and the limit recess 1244 cooperate, and the processed bearing steel ring between the two retaining bars 124 is lowered and falls onto the conveying chain plate 110, and is moved out to the outside of the loading and unloading plate 123 through the limit plate 114;

[0116] The limit plate 114 moves the bearing steel ring to the position between the two retaining bars 124 through the magnetic attraction body 115. During the movement, the top of the bearing steel ring acts on the downward-sloping part of the bottom of the lifting top plate 1232, forcing it to rise and compress the elastic member 1231. The upward movement of the lifting top plate 1232 drives the clamping jaw 1242 to move upward through the connecting rope 1233, and forces the elastic pin 1245 to disengage from the limit recess 1244. When the elastic pin 1245 passes through the minimum depth position of the arc-shaped guide groove 1243, the elastic pin 1245 will cooperate with the depth change of the arc-shaped guide groove 1243 to slowly clamp the new bearing steel ring. Finally, the clamping and lifting actions of the bearing steel ring are completed. The top surface of the bearing steel ring fits against the bottom surface of the loading and unloading plate 123. At this time, the top disc 506 and the bearing steel ring are in corresponding front and back positions, and the outer wall of the bearing steel ring fits against the surface of the adjusting support roller 502;

[0117] Step 2, longitudinal loading of the workpiece

[0118] The piston rod of the longitudinal cylinder 121 retracts, driving the moving frame 122 and the loading and unloading plate 123 to move backward until the bearing steel ring and the top disc 506 at the rough grinding processing station are in corresponding up and down positions;

[0119] Step 3, workpiece pressing

[0120] The downward pressure cylinder 430 drives the downward pressure slide plate 420 and the downward pressure member 430 to move downward. The socket body 441 enters the inside of the bearing steel ring, and the downward pressure rolling body 442 presses the downward pressure bearing steel ring onto the top disc 506. During the downward pressure process, the top disc 506 moves downward to compress the spring member 505. At the same time, the bearing steel ring moves downward actively, the clamping jaw 1242 turns downward, and the elastic pin 1245 moves downward along the arc-shaped guide groove 1243 and passes through the minimum depth position of the arc-shaped guide groove 1243. Then, the elastic pin 1245 will continue to move downward slowly in cooperation with the depth change of the arc-shaped guide groove 1243 until the clamping jaw 1242 separates from the bearing steel ring. Finally, the elastic pin 1245 and the limit recess 1244 are adapted, and the top disc 506 drives the bearing steel ring to rotate at high speed under the action of the driving main shaft 503;

[0121] Step 4, rib and raceway processing

[0122] Adjust the machining center of the edge grinding part 2316 in advance to coincide with the center of the edge surface to be machined. The servo motor 233 of the edge grinding mechanism 200 drives the eccentric drive shaft 234 to rotate, driving the eccentric sleeve 235 and the rolling body 238 to rotate, driving the moving frame 239 to make high-frequency reciprocating motion along the fixed seat 232. During the motion, the elastic body 2315 always keeps the moving frame 239 and the rolling body 238 in close contact, and the edge grinding part 2316 performs rough grinding on the edge surface;

[0123] Adjust the machining center of the raceway grinding part 351 in advance to coincide with the center of the raceway surface to be machined. The servo motor 233 of the raceway grinding mechanism 300 drives the eccentric drive shaft 234 to rotate, driving the eccentric sleeve 235 and the rolling body 238 to rotate, driving the moving frame 239 to make high-frequency reciprocating motion along the fixed seat 232. During the motion, the elastic body 2315 always keeps the moving frame 239 and the rolling body 238 in close contact, and the raceway grinding part 351 performs rough grinding on the raceway surface;

[0124] Step 5, workpiece re-constraint

[0125] The piston rod of the downward pressing cylinder 430 retracts inward, the downward pressing slide plate 420 and the downward pressing rolling body 442 move upward, releasing the downward pressing force on the bearing steel ring after rough grinding. The spring part 505 acts on the top plate 506 to move the bearing steel ring upward. First, it will act on the elastic pin 1245 to disengage from the limit recess 1244, and the clamping claw 1242 will turn up. After the elastic pin 1245 passes through the minimum depth of the arc-shaped guide groove 1243, the elastic pin 1245 will re-clamp the bearing steel ring after rough grinding in combination with the depth change of the elastic pin 1245, and the top surface of the bearing steel ring after rough grinding fits on the bottom surface of the loading and unloading plate 123;

[0126] Step 6, workpiece longitudinal unloading

[0127] The piston rod of the longitudinal cylinder 121 moves outward, driving the moving frame 122 and the loading and unloading plate 123 to move forward until the bearing steel ring after rough grinding returns above the conveying chain plate 110 again;

[0128] The bearing steel ring after rough grinding repeats steps 1 to 6 at the rough grinding processing station to complete the finish grinding operation.

Claims

1. A processing technology for the inner raceway of a workpiece, characterized in that, Including: Step 1, workpiece loading preparation The bearing steel rings are horizontally conveyed by a conveying chain plate, and each time only one passes through under the control of two stop cylinders independently arranged on the front side of the conveying chain plate; The single bearing steel ring passing through is conveyed by the conveying chain plate to the left side of the limit plate and adsorbed by a magnetic adsorbent. The limit plate is located above the conveying chain plate. After adsorption, it moves to the right by the limit plate and enters between two stop bars on the bottom surface of the loading and unloading plate. The loading and unloading plate is located above the limit plate; Step 2, longitudinal workpiece loading The piston rod of the longitudinal cylinder retracts inward, driving the moving frame and the loading and unloading plate to move backward until the bearing steel ring and the top plate at the rough grinding processing station are vertically aligned; Step 3, workpiece pressing The pressing cylinder drives the pressing slide plate and the pressing member to move downward. The socket body enters the inside of the bearing steel ring, and the pressing rolling body presses the bearing steel ring on the top plate. Moreover, the restraint at the top of the bearing steel ring is released, and the top plate drives the bearing steel ring to rotate at high speed; Step 4, rib and raceway machining The rib grinding mechanism grinds the rib surface; The raceway grinding mechanism grinds the raceway surface; Step 5, re - restraint of the workpiece The piston rod of the pressing cylinder retracts inward, the pressing slide plate and the pressing rolling body move upward, releasing the downward pressing force on the roughly ground bearing steel ring. The top plate moves the roughly ground bearing steel ring upward until the roughly ground bearing steel ring returns to its initial position; Step 6, longitudinal workpiece unloading The piston rod of the longitudinal cylinder moves outward, driving the moving frame and the loading and unloading plate to move forward until the roughly ground bearing steel ring returns above the conveying chain plate again; The roughly ground bearing steel ring repeats the steps at the finish grinding processing station until the finish grinding operation is completed.

2. The machining process for the inner raceway of a workpiece according to claim 1, characterized in that, In Step 1, a moving table and a position control cylinder are independently arranged on the front side of the conveying chain plate. The end of the piston rod of the position control cylinder is installed on the moving table, and the limit plate is installed on the moving table.

3. A workpiece inner raceway machining process according to claim 2, characterized in that In Step 1, an installation groove is provided at the bottom of the stop bar. A clamping claw is rotatably installed in the installation groove. One end of the clamping claw contacts the top rib of the bearing steel ring. An arc - shaped guide groove centered on the rotation node of the clamping claw is provided on the side of the installation groove. The depth of the arc - shaped guide groove first decreases and then increases from top to bottom. A limit recess is provided at the lower end of the arc - shaped guide groove. An elastic pin is installed on the side of the clamping claw and is slidably matched in the arc - shaped guide groove; A sunken groove is provided at the bottom of the loading and unloading plate. A lifting top plate is installed in the sunken groove through an elastic member. A connecting rope is installed at the bottom of the lifting top plate. The free end of the connecting rope passes through the stop bar and enters the installation groove and is connected to the clamping claw; A pulling body that slides back and forth is installed inside the installation groove. One end of the pulling body is exposed outside the installation groove, and the other end is connected to a pulling rope. The pulling rope is connected to the clamping claw. An internal wedge surface is provided on the pulling body located outside the installation groove; A vertical rod is installed on the limit plate. A horizontal member is installed at the top of the vertical rod. A wedge - shaped body is provided on one side of the horizontal member opposite to the stop bar and is horizontally corresponding to the internal wedge surface; The bottom of the lifting top plate is inclined downward on the side away from the bearing steel ring.

4. A workpiece inner raceway machining process according to claim 3, characterized in that The piston rod of the position control cylinder retracts inward, the limit plate moves the bearing steel ring to the right, the wedge body on the horizontal horizontal rod acts on the built-in wedge surface to move the traction body outward, and the traction body rotates the clamping jaw downward through the traction rope until the elastic pin passes through the minimum depth position of the arc-shaped guide groove. Then, the clamping jaw rotates downward until the elastic pin and the limit recess are engaged, and the processed bearing steel ring between the two retaining bars is lowered and falls onto the conveying chain plate, and is moved out to the outside of the loading and unloading plate through the limit plate. The limit plate moves the bearing steel ring to the position between the two retaining bars through the magnetic attraction body. During the movement, the top of the bearing steel ring acts on the downward-sloping part of the bottom of the lifting top plate, forcing it to rise and compress the elastic member. The upward movement of the lifting top plate drives the clamping jaw upward through the connecting rope, and forces the elastic pin to disengage from the limit recess. When the elastic pin passes through the minimum depth position of the arc-shaped guide groove, the elastic pin will cooperate with the depth change of the arc-shaped guide groove to slowly clamp the new bearing steel ring. Finally, the clamping and lifting actions of the bearing steel ring are completed, and the top surface of the bearing steel ring is in contact with the bottom surface of the loading and unloading plate. At this time, the front and rear positions of the top plate and the bearing steel ring correspond.

5. A workpiece inner raceway machining process according to claim 1, characterized in that, In step 2, the bottom of the top plate is connected to the driving disk through a spring member, and the driving spindle is installed at the bottom of the driving disk. A rear positioning arc seat is independently arranged at the rear of the top plate, and two groups of adjusting support rollers are radially installed on the rear positioning arc seat.

6. A workpiece inner raceway machining process according to claim 5, characterized in that In step 3, during the downward pressing process, the top plate moves downward to compress the spring member. At the same time, the bearing steel ring moves downward actively, the clamping jaw turns downward, and the elastic pin moves downward along the arc-shaped guide groove and passes through the minimum depth position of the arc-shaped guide groove. Then, the elastic pin will continue to move downward slowly in cooperation with the depth change of the arc-shaped guide groove until the clamping jaw is separated from the bearing steel ring, and finally the elastic pin and the limit recess are adapted.

7. A workpiece inner raceway machining process according to claim 6, characterized in that, In step 3, when the spring member acts on the top plate to lift the roughly ground bearing steel ring, it will first act on the elastic pin to disengage from the limit recess, the clamping jaw turns upward, and after the elastic pin passes through the minimum depth of the arc-shaped guide groove, the elastic pin will combine with the depth change of the elastic pin to re-clamp the roughly ground bearing steel ring by the clamping jaw, and the top surface of the roughly ground bearing steel ring is in contact with the bottom surface of the loading and unloading plate.

8. A workpiece inner raceway machining process according to claim 1, characterized in that, The rib grinding mechanism includes a horizontal slide, a rib grinding seat is installed on the top of the horizontal slide, and a rib grinding assembly is installed on the rib grinding seat through an angle adjustment structure. The raceway grinding mechanism includes a raceway grinding slide, an adjustment frame is installed on the top of the raceway grinding slide, a raceway grinding seat and an adjustment assembly for adjusting the angle of the raceway grinding seat are installed on the adjustment frame, and a raceway grinding assembly is installed on the raceway grinding seat.

9. A workpiece inner raceway machining process according to claim 8, characterized in that, The angle adjustment structure includes a worm and a worm gear installed on the rib grinding seat. The worm and the worm gear cooperate. A driving gear is installed on the rotating shaft of the worm gear. One end of the worm is provided with an operating rod. An arc-shaped rack meshing with the driving gear is installed on the rib grinding assembly. An arc-shaped notch is installed on the rib grinding seat, and a pressing bolt is installed in the arc-shaped notch. The pressing bolt is installed on the rib grinding assembly. Both the first grinding drive assembly and the second grinding drive assembly are fixed seats. A servo motor is installed on the fixed seat. An eccentric drive shaft is installed at the output end of the servo motor. One end of the eccentric drive shaft is rotatably installed on the fixed seat. An eccentric sleeve, an adjusting sleeve and a locking nut are installed on the eccentric drive shaft. A rolling element is installed on the outer side of the eccentric sleeve. The adjusting sleeve is axially slidably fitted on the eccentric drive shaft and the side in contact with the eccentric sleeve is an annular tooth surface. The locking nut is used to squeeze the adjusting sleeve so that one end of the eccentric sleeve and the adjusting sleeve are in contact and remain relatively stationary. A moving frame is sleeved on the outer side of the rolling element. The moving frame is slidably fitted on the fixed seat. The moving frame is used to install a rib grinding assembly or a raceway grinding part. A guide body is installed on the fixed seat and one end of the guide body is inserted into the moving frame. An elastic body is sleeved on the outer side of the guide body. The rib grinding assembly includes a mounting plate installed on the moving frame through a rotating shaft. An angle adjustment groove is provided on the moving frame. The mounting plate is restricted from rotating relative to the moving frame by a locking bolt in the angle adjustment groove. An adjusting screw is rotatably installed on the moving frame. The adjusting screw is used to adjust the angle of the mounting plate relative to the moving frame. The mounting plate is used to install a rib grinding part.

10. A workpiece inner raceway machining process according to claim 9, characterized in that, The rib grinding mechanism grinds the rib surface as follows: It is necessary to adjust in advance so that the machining center of the rib grinding part coincides with the center of the rib surface to be machined. The servo motor of the rib grinding mechanism drives the eccentric drive shaft to rotate, drives the eccentric sleeve and the rolling element to rotate, drives the moving frame to make high-frequency reciprocating motion along the fixed seat. During the motion, the elastic body always keeps the moving frame and the rolling element in close contact. The rib grinding part performs rough grinding on the rib surface. The raceway grinding mechanism grinds the raceway surface as follows: It is necessary to adjust in advance so that the machining center of the raceway grinding part coincides with the center of the raceway surface to be machined. The servo motor of the raceway grinding mechanism drives the eccentric drive shaft to rotate, drives the eccentric sleeve and the rolling element to rotate, drives the moving frame to make high-frequency reciprocating motion along the fixed seat. During the motion, the elastic body always keeps the moving frame and the rolling element in close contact. The raceway grinding part performs rough grinding on the raceway surface.

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