Device and Method for Improving the Surface Quality and Performance of Bearing Ring Raceways

Abstract

The present invention relates to the technical field of bearing processing, and particularly to a device and a method for improving the surface quality and performance of the raceway of a bearing ring, including a chuck. A die base is arranged on the front surface of the chuck, and a expansion sleeve is movably connected to the front surface of the die base. A group of deformation openings are respectively arranged on the front and rear edges of the outer surface of the expansion sleeve. Each group of deformation openings is provided with a plurality of deformation openings distributed in an annular array. A first deformation part is formed between the adjacent deformation openings at the rear, and a second deformation part is formed between the adjacent deformation openings at the front. A fixed cylinder is fixedly connected to the front surface of the die base and located inside the expansion sleeve. A group of insertion columns are respectively arranged on the front and rear edges of the outer surface of the fixed cylinder. Each group of insertion columns is provided with a plurality of insertion columns distributed in an annular array. The present invention significantly improves the surface microtopography of the inner ring raceway of the bearing and effectively eliminates the microcracks generated on the surface of the bearing raceway during grinding. A device and a method for improving the surface quality and performance of the raceway of a bearing ring according to the present invention improve the technological process and save costs.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing processing, and particularly to a device and method for improving the surface quality and performance of bearing ring raceways. Background Art

[0002] Frequent contact, relative movement and friction occur between the bearing ring raceway and the rolling elements, resulting in surface fatigue failure, wear failure and strength failure of the bearing ring raceway, seriously affecting the service life of the bearing. The surface quality of the bearing raceway largely determines the service performance of the bearing and is the most important parameter for evaluating the bearing performance. At present, the processing of the bearing ring raceway mainly involves a processing technology of grinding the raceway with a grinding wheel, then lapping, and finally polishing for finishing. The current processing technology has the following problems: (1) The process flow is long, the efficiency is low, and the cost is high; (2) The stress distribution on the processed surface is uneven, and tensile stress is likely to exist, affecting the anti-fatigue performance of the bearing. Summary of the Invention

[0003] The purpose of the present invention is to solve the disadvantages existing in the background art, and to provide a device and method for improving the surface quality and performance of bearing ring raceways.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A device for improving the surface quality and performance of bearing ring raceways, including a chuck, a die base is arranged on the front surface of the chuck, a expansion sleeve is movably connected to the front surface of the die base, a group of deformation openings are respectively arranged on the front and rear edges of the outer surface of the expansion sleeve, each group of deformation openings is provided with a plurality of deformation openings arranged in a circular array, a first deformation part is formed between adjacent deformation openings at the rear, and a second deformation part is formed between adjacent deformation openings at the front. A fixed cylinder is fixedly connected to the front surface of the die base and located inside the expansion sleeve. A group of insertion posts are respectively arranged on the front and rear edges of the outer surface of the fixed cylinder, each group of insertion posts is provided with a plurality of insertion posts arranged in a circular array, and the insertion posts are slidably connected to the fixed cylinder through an elastic mechanism. One end of the front insertion post contacts the inner wall of the second deformation part, and one end of the rear insertion post contacts the inner wall of the first deformation part. A threaded hole is penetrated through the middle of the front surface of the die base, and a threaded post is threadedly inserted into the front end of the threaded hole, and a pushing ring is fixedly arranged on the outer surface of the threaded post.

[0005] Preferably, connecting blocks are respectively fixedly connected to the upper and lower parts at the rear of the expansion sleeve, side blocks are respectively fixedly connected to the rear ends of the two side surfaces of the connecting blocks, sliding openings are respectively opened on the upper and lower parts of the front surface of the die base, the connecting blocks are slidably inserted into the ports of the sliding openings, and the side blocks are movably clamped into the inner sides of the sliding openings.

[0006] Preferably, the elastic mechanism includes a guide cylinder fixedly embedded on the outer surface of the fixed cylinder. The plug is slidably inserted into the inner side of the guide cylinder. One end of the plug away from the expansion sleeve is fixedly connected with a moving disk. One end of the guide cylinder close to the moving disk is fixedly connected with a fixed disk. A compression spring is fixedly connected between the moving disk and the fixed disk, and the compression spring is sleeved on the surface of the plug.

[0007] Preferably, transition surfaces are respectively formed on the front and rear surfaces of the pushing ring.

[0008] Preferably, a contact sleeve is fixedly connected to the front end of the threaded post.

[0009] Preferably, the rear surface of the chuck is connected to the output end of the lathe. A slide is slidably connected to the upper surface of the lathe. A second motor is fixedly installed on the front surface of the slide. The output shaft of the second motor is fixedly connected with a pushing column. The pushing column rotatably penetrates through the outer surface of the slide. The rear end of the pushing column is fixedly connected with a pushing head, and the pushing head is located in front of the contact sleeve.

[0010] Preferably, an ultrasonic rolling press is fixedly installed on the rear surface of the lathe. A rolling head is arranged at the lower end of the ultrasonic rolling press, and the rolling head is located above the expansion sleeve.

[0011] Preferably, a first motor is fixedly connected to the rear end of one side surface of the lathe. The output shaft of the first motor is fixedly connected with a lead screw. The lead screw is rotatably connected to the side surface of the lathe, and the lead screw threadedly penetrates through the inner side of the slide.

[0012] A method for improving the surface quality and performance of the bearing ring raceway is also proposed, which is carried out by using the above device and includes the following steps:

[0013] S1. Perform heat treatment before ultrasonic surface rolling treatment on the bearing inner ring raceway;

[0014] S2. Rough grind and finish grind the surface of the bearing inner ring raceway;

[0015] S3. Position the bearing inner ring on the outer surface of the expansion sleeve, and then perform ultrasonic rolling operation on the bearing inner ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention significantly improves the surface microtopography of the bearing inner ring raceway and effectively eliminates the microcracks generated by grinding on the bearing raceway surface. The device and method for improving the surface quality and performance of the bearing ring raceway of the present invention improve the process flow and save costs;

[0018] 2. The present invention improves the surface stress distribution of the bearing inner ring during processing, improves the anti-fatigue performance of the bearing, and has simple operation and high stability;

[0019] 3. The present invention can prevent the problem that in the ultrasonic rolling for a long time, the stress at a certain local position on the inner wall of the bearing inner ring is too concentrated, resulting in deformation and damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural schematic diagram of the device for improving the surface quality and performance of the bearing ring raceway of the present invention;

[0021] Figure 2 It is a sectional view of the die holder of the device for improving the surface quality and performance of the bearing ring raceway of the present invention;

[0022] Figure 3 It is of the device for improving the surface quality and performance of the bearing ring raceway of the present invention Figure 2 enlarged view at A;

[0023] Figure 4 It is a schematic diagram of the expansion sleeve and the fixed cylinder of the device for improving the surface quality and performance of the bearing ring raceway of the present invention;

[0024] Figure 5 It is a schematic diagram of the elastic mechanism of the device for improving the surface quality and performance of the bearing ring raceway of the present invention;

[0025] Figure 6 It is a schematic diagram of the expansion sleeve of the device for improving the surface quality and performance of the bearing ring raceway of the present invention;

[0026] Figure 7 It is a sectional view of the die holder of the device for improving the surface quality and performance of the bearing ring raceway of the present invention.

[0027] Figure 8 It is a schematic diagram of the device for improving the surface quality and performance of the bearing ring raceway of the present invention.

[0028] In the figure: 1. chuck; 2. die holder; 3. expansion sleeve; 4. deformation opening; 5. connecting block; 6. side block; 7. sliding opening; 8. fixed cylinder; 9. guide cylinder; 10. inserting post; 11. fixed disk; 12. compression spring; 13. moving disk; 15. first deformation part; 16. second deformation part; 17. threaded post; 18. threaded hole; 19. pushing ring; 20. transition surface; 21. contact sleeve; 22. pushing post; 23. pushing head; 24. lathe; 25. sliding table; 26. lead screw; 27. first motor; 28. second motor; 29. ultrasonic rolling machine; 30. rolling head; 31. bearing inner ring. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0030] As Figures 1 - 8 shown in the device for improving the surface quality and performance of the bearing ring raceway, including a chuck 1. The chuck 1 is a common three-jaw chuck in the prior art. A die base 2 is provided on the front surface of the chuck 1. A expansion sleeve 3 is movably connected to the front surface of the die base 2. Groups of deformation openings 4 are respectively formed on the front and rear edges of the outer surface of the expansion sleeve 3. Each group of deformation openings 4 is provided with several deformation openings 4 arranged in an annular array. A first deformation part 15 is formed between adjacent deformation openings 4 at the rear, and a second deformation part 16 is formed between adjacent deformation openings 4 at the front. A fixed cylinder 8 is fixedly connected to the front surface of the die base 2 and located inside the expansion sleeve 3. Groups of insertion posts 10 are respectively arranged on the front and rear edges of the outer surface of the fixed cylinder 8. Each group of insertion posts 10 is provided with several insertion posts 10 arranged in an annular array. The insertion posts 10 are slidably connected to the fixed cylinder 8 through an elastic mechanism. One end of the front insertion post 10 contacts the inner wall of the second deformation part 16, and one end of the rear insertion post 10 contacts the inner wall of the first deformation part 15. A threaded hole 18 is penetrated through the middle of the front surface of the die base 2. A threaded post 17 is threadedly inserted into the front end of the threaded hole 18. A pushing ring 19 is fixedly arranged on the outer surface of the threaded post 17.

[0031] Connection blocks 5 are respectively fixedly connected to the upper and lower parts at the rear of the expansion sleeve 3. Side blocks 6 are respectively fixedly connected to the rear ends of the two side surfaces of the connection blocks 5. Slide openings 7 are respectively formed on the upper and lower parts of the front surface of the die base 2. The connection blocks 5 are slidably inserted into the ports of the slide openings 7, and the side blocks 6 are movably clamped into the inner sides of the slide openings 7. It should be noted that: the side wall of the slide opening 7 contacts the side surface of the side block 6, but there is a gap between the inner rear wall of the slide opening 7 and the side block 6 to ensure that the deformation of the first deformation part 15 is not interfered.

[0032] The elastic mechanism includes a guide cylinder 9 fixedly embedded on the outer surface of the fixed cylinder 8. The insertion post 10 is slidably inserted into the inner side of the guide cylinder 9. A moving disk 13 is fixedly connected to the end of the insertion post 10 away from the expansion sleeve 3. A fixed disk 11 is fixedly connected to the end of the guide cylinder 9 close to the moving disk 13. A compression spring 12 is fixedly connected between the moving disk 13 and the fixed disk 11, and the compression spring 12 is sleeved on the surface of the insertion post 10. The compression spring 12 provides elastic force to ensure that one end of the insertion post 10 does not abut against the inner wall of the expansion sleeve 3 when the moving disk 13 is not pushed.

[0033] Transition surfaces 20 are respectively formed on the front and rear surfaces of the pushing ring 19. It plays a guiding role to ensure that the moving disk 13 can be pushed during the rearward movement of the pushing ring 19.

[0034] A contact sleeve 21 is fixedly connected to the front end of the threaded post 17. The contact sleeve 21 facilitates the rotation of the threaded post 17.

[0035] The following discloses the adaptation method during the use of the device: Connect the rear surface of the chuck 1 to the output end of the lathe 24. A slide table 25 is slidably connected to the upper surface of the lathe 24. A second motor 28 is fixedly installed on the front surface of the slide table 25. The output shaft of the second motor 28 is fixedly connected to a pushing column 22. The pushing column 22 rotatably penetrates the outer surface of the slide table 25. The rear end of the pushing column 22 is fixedly connected to a pushing head 23. The pushing head 23 is located in front of the contact sleeve 21. The pushing column 22 is driven to rotate by the second motor 28.

[0036] An ultrasonic rolling press 29 is fixedly installed on the rear surface of the lathe 24. A rolling head 30 is arranged at the lower end of the ultrasonic rolling press 29. The rolling head 30 is located above the expansion sleeve 3. This part is prior art and is relatively common in the ultrasonic rolling treatment of metal surfaces, so no more details will be given.

[0037] A first motor 27 is fixedly connected to the rear end of one side surface of the lathe 24. The output shaft of the first motor 27 is fixedly connected to a lead screw 26. The lead screw 26 is rotatably connected to the side surface of the lathe 24. The lead screw 26 threadedly penetrates the inside of the slide table 25. When the first motor 27 operates, the lead screw 26 rotates, thereby controlling the movement of the slide table 25.

[0038] The method for improving the surface quality and performance of the bearing ring raceway is carried out by using the above-mentioned device, and includes the following steps:

[0039] S1. Perform heat treatment on the bearing inner ring 31 raceway before ultrasonic surface rolling treatment;

[0040] S2. Rough grind and finish grind the surface of the bearing inner ring 31 raceway;

[0041] S3. Fit the bearing inner ring 31 on the outer surface of the expansion sleeve 3 for positioning, and then perform the ultrasonic rolling operation on the bearing inner ring 31.

[0042] Through the ultrasonic rolling operation on the bearing inner ring 31, the surface microtopography of the bearing inner ring 31 raceway is significantly improved, and the microcracks generated by grinding on the bearing raceway surface are effectively eliminated; A device and method for improving the surface quality and performance of a bearing ring raceway of the present invention improve the process flow and save costs; The surface stress distribution of the bearing inner ring during processing is improved, the anti-fatigue performance of the bearing is improved, and the operation is simple and the stability is high.

[0043] The user sleeved the inner ring 31 of the bearing on the surface of the expansion sleeve 3 for fixation. By rotating the threaded column 17, it moved backward, and the pushing ring 19 pushed the relatively forward moving disk 13. Then, the insertion column 10 pushed the second deformation part 16, and the second deformation part 16 was tightened, firmly contacting the inner wall of the bearing inner ring 31. Under the action of the subsequent rolling head 30, the surface of the bearing inner ring 31 was rolled. During the rolling of a certain number of turns, the threaded column 17 rotated reversely relative to the chuck 1, so that the threaded column 17 moved further backward. At this time, the pushing ring 19 would contact the relatively backward moving disk 13, so that the insertion column 10 at this position pushed the first deformation part 15, that is, changed the position of the tightening force on the bearing inner ring 31, preventing the problem that a certain local position on the inner wall of the bearing inner ring 31 was damaged due to excessive force concentration during a long-time ultrasonic rolling.

[0044] When the user controls the rotation of the threaded column 17, it is driven by the first motor 27, so that the lead screw 26 rotates, and then drives the slide table 25 to move backward, so that the pushing column 22 moves backward. At the same time, it is driven by the second motor 28, so that the pushing column 22 rotates. When the rotating pushing head 23 touches the contact sleeve 21, the threaded column 17 rotates and has a force to move backward. Therefore, the threaded column 17 will move backward relative to the inside of the threaded hole 18. In this way, the automatic control of the backward movement of the threaded column 17 is realized, and the operation is convenient.

[0045] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for improving the surface quality and performance of a bearing ring raceway, comprising a chuck (1), characterized in that: The front surface of the chuck (1) is provided with a die base (2), the front surface of the die base (2) is movably connected with an expansion sleeve (3), the front and rear edges of the outer surface of the expansion sleeve (3) are respectively provided with groups of deformation openings (4), each group of deformation openings (4) is arranged as a plurality of deformation openings distributed in a ring array, a first deformation portion (15) is formed between adjacent deformation openings (4) at the rear, a second deformation portion (16) is formed between adjacent deformation openings (4) at the front, the front surface of the die base (2) and located at the inner side of the expansion sleeve (3) is fixedly connected with a fixed cylinder (8), the front and rear edges of the outer surface of the fixed cylinder (8) are respectively A group of plug posts (10) is provided, each group of plug posts (10) is arranged to have a plurality of plug posts distributed in a circular array, the plug posts (10) are slidably connected to the fixed cylinder (8) via an elastic mechanism, one end of the front plug post (10) contacts the inner wall of the second deformation portion (16), one end of the rear plug post (10) contacts the inner wall of the first deformation portion (15), a threaded hole (18) is provided through the middle of the front surface of the mold base (2), a threaded post (17) is threadedly inserted into the front end of the threaded hole (18), and a pushing ring (19) is fixedly provided on the outer surface of the threaded post (17); The rear upper and lower parts of the expansion sleeve (3) are respectively fixedly connected with connection blocks (5), and the rear ends of the two side surfaces of the connection block (5) are respectively fixedly connected with side blocks (6). The front upper and lower parts of the mold base (2) are respectively provided with sliding openings (7), and the connection block (5) is slidably inserted into the port of the sliding opening (7), and the side blocks (6) are movably inserted into the inner side of the sliding opening (7); The elastic mechanism comprises a guide tube (9) fixedly embedded in the outer surface of the fixed tube (8), the plug post (10) is slidably inserted into the inner side of the guide tube (9), the end of the plug post (10) away from the expansion sleeve (3) is fixedly connected to a movable disk (13), the end of the guide tube (9) close to the movable disk (13) is fixedly connected to a fixed disk (11), a compression spring (12) is fixedly connected between the movable disk (13) and the fixed disk (11), and the compression spring (12) is sleeved on the surface of the plug post (10).

2. The device for improving the surface quality and performance of the bearing ring raceway according to claim 1, characterized in that: The front and rear surfaces of the pushing ring (19) are respectively provided with transition curved surfaces (20).

3. The device for improving the surface quality and performance of the bearing ring raceway according to claim 1, characterized in that: A contact sleeve (21) is fixedly connected to the front end of the threaded column (17).

4. The device for improving the surface quality and performance of the bearing ring raceway according to claim 3, characterized in that: The rear surface of the chuck (1) is connected to the output end of the lathe (24); the upper surface of the lathe (24) is slidably connected to a slide table (25); a second motor (28) is fixedly mounted on the front surface of the slide table (25); an output shaft of the second motor (28) is fixedly connected to a pushing column (22); the pushing column (22) rotates and penetrates the outer surface of the slide table (25); a rear end of the pushing column (22) is fixedly connected to a pushing head (23); the pushing head (23) is located in front of the contact sleeve (21).

5. The device for improving the surface quality and performance of the bearing ring raceway according to claim 4, characterized in that: An ultrasonic rolling machine (29) is fixedly mounted on the rear surface of the lathe (24), a rolling head (30) is provided at the lower end of the ultrasonic rolling machine (29), and the rolling head (30) is located above the expansion sleeve (3).

6. The device for improving the surface quality and performance of the bearing ring raceway according to claim 4, characterized in that: A first motor (27) is fixedly connected to a rear end of a side surface of the lathe (24); an output shaft of the first motor (27) is fixedly connected to a screw rod (26); the screw rod (26) is rotatably connected to a side surface of the lathe (24); and the screw rod (26) is threadedly passed through the inner side of the slide table (25).

7. A method for improving the surface quality and performance of a bearing ring raceway, using a device as described in any one of claims 5 to 6, characterized in that: The following steps are involved: S1. heat treating the groove of the bearing inner ring (31) before ultrasonic surface rolling treatment; S2, rough grinding and fine grinding of the groove surface of the bearing inner ring (31); S3, the bearing inner ring (31) is sleeved onto the outer surface of the expansion sleeve (3) for positioning, and then the bearing inner ring (31) is subjected to ultrasonic rolling.

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