Device for round corner rolling strengthening and destressing

Abstract

The invention discloses a device for round corner rolling strengthening and destressing, and belongs to the technical field of machining. The problems that at the present stage, a workpiece fillet strengthening method is low in efficiency, automation cannot be achieved, and fillet strengthening and residual stress removal cannot be conducted at the same time are solved. The device comprises a rolling mechanism, an extrusion rotation driving mechanism and a destressing ultrasonic mechanism, the rolling mechanism comprises a fixed seat, an annular extrusion part, a ball retainer and balls, and the extrusion rotation driving mechanism is connected with the fixed seat and drives the fixed seat to rotate in the circumferential direction and move in the axial direction; the annular extrusion part and the ball retainer are mounted on the fixed seat, and the balls are mounted on the ball retainer; when the extrusion rotation driving mechanism drives the balls to axially move and circumferentially rotate through the fixed seat, the annular extrusion part and the ball retainer, the balls are in contact with and extrude the fillets of the workpiece so as to roll the fillets of the workpiece; the destressing ultrasonic mechanism is connected with the workpiece, and the stress of the fillet of the workpiece in the strengthening stage is removed through ultrasonic waves. The method is mainly used for machining and destressing the round corners of the workpieces.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a device for rounded corner rolling strengthening and stress relief. Background Art

[0002] During the use of workpieces, the rounded corners of the workpieces often bear large loads and produce high stress concentration, which makes the workpieces very easy to crack and deform, and then cause premature failure of the workpieces. After the workpieces are formed by casting, forging and other processing techniques, they often have a lot of residual stress inside. This residual stress affects the service performance of the workpieces, causing the workpieces to easily deform and crack during service, which will pose a hidden danger to the service life of the workpieces and the safety of supporting equipment. In addition, the current strengthening methods for the rounded corners of workpieces are inefficient and cannot achieve automated strengthening processing. The rounded corner strengthening and residual stress removal cannot be carried out at the same time, and the strengthening effect and stress removal effect cannot reach the ideal state. Summary of the invention

[0003] In view of this, the present invention provides a device for rounded corner rolling strengthening and stress relief, which utilizes balls in a rolling mechanism to roll and strengthen the rounded corners of a workpiece, and simultaneously utilizes ultrasound to remove stress during the rolling process, thereby improving the bearing capacity of the workpiece.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A device for rounded corner rolling strengthening and stress relief, comprising a rolling mechanism for rolling the rounded corners of a workpiece, an extrusion and rotation driving mechanism for circumferential rotation of the rolling mechanism and providing axial force to the rolling mechanism, and a stress relief ultrasonic mechanism for removing residual stress of the workpiece;

[0006] The rolling mechanism includes a fixed seat, an annular extrusion piece, a ball retainer and a ball. The power output end of the extrusion rotation drive mechanism is connected to the fixed seat and drives the fixed seat to rotate circumferentially and move axially. The annular extrusion piece and the ball retainer are movably installed in the fixed seat in turn and can rotate circumferentially and move axially with the fixed seat. The ball is installed on the ball retainer and can roll. When the extrusion rotation drive mechanism drives the fixed seat to move axially, the annular extrusion piece and the ball retainer move axially with the fixed seat until the annular extrusion piece contacts and extrudes the ball, and the ball contacts and extrude the fillet of the workpiece. The extrusion rotation drive mechanism drives the ball to rotate circumferentially to roll the fillet of the workpiece and strengthen it. The stress relief ultrasonic mechanism connects the workpiece and transmits ultrasonic waves to remove the residual stress of the workpiece during the rolling strengthening stage.

[0007] Furthermore, the fixed seat is a circular cover structure, a keyway is opened on the inner circumferential wall of the fixed seat, the ball retainer is an annular structure, and a sliding key matching the keyway is provided on the outer circumferential wall of the ball retainer. The ball retainer is installed in the fixed seat and can slide along the central axis direction of the fixed seat.

[0008] Furthermore, the ball retainer is provided with a plurality of circular openings along the circumferential direction, and the balls are installed in the circular openings and can roll.

[0009] Furthermore, one end of the annular extrusion piece facing the fixing seat is a plane, and one end of the annular extrusion piece facing the ball retainer is provided with an arcuate extrusion surface, and the arcuate extrusion surface contacts and extrudes the ball.

[0010] Furthermore, the extrusion rotation drive mechanism includes a linear drive and a rotary motor, the motor seat of the rotary motor is connected to the telescopic rod of the linear drive and moves linearly with the telescopic rod, and the fixed seat is connected to the motor shaft of the rotary motor and rotates with the motor shaft.

[0011] Furthermore, the linear drive is a hydraulic cylinder.

[0012] Furthermore, the rolling mechanism also includes a connecting sleeve, one end of which is connected to the motor shaft key of the rotating motor, and the other end of the connecting sleeve is detachably connected to the fixing seat.

[0013] Furthermore, there are two rolling mechanisms and two extrusion rotary drive mechanisms, one extrusion rotary drive mechanism and one rolling mechanism form a group, and the two groups are symmetrically arranged on both sides of the workpiece and move synchronously; when the balls of the two rolling mechanisms synchronously extrude the fillets on both sides of the workpiece, the fillets on both sides of the workpiece are rolled and strengthened.

[0014] Furthermore, the stress relief ultrasonic mechanism includes an ultrasonic controller and an ultrasonic fixing clamp, one end of the ultrasonic fixing clamp is connected to the ultrasonic controller, and the other end is connected to the workpiece. When the ultrasonic controller generates ultrasonic waves, the ultrasonic waves are transmitted to the workpiece via the ultrasonic fixing clamp to achieve stress relief during the workpiece rounding and strengthening stage.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can realize the rolling of the rounded corners of the workpiece by using the design of the rolling mechanism and the extrusion rotation drive mechanism, without manual operation, with high automation and high work efficiency. At the same time, the rounded corners of the workpiece are subjected to residual stress removal by ultrasonic equipment during the rolling process, so that the residual stress of the workpiece after strengthening is controlled within a reasonable range, the strength of the workpiece is improved, the initiation of cracks is suppressed, and the overall safety factor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are incorporated as part of this application and are used to provide a further understanding of the present invention.

[0018] Figure 1 A schematic structural diagram of a device for rounded corner rolling strengthening and stress relief is provided to realize the present invention.

[0019] Figure 2 A side view of a device for rounded corner rolling strengthening and stress relief for realizing the present invention.

[0020] Figure 3 It is a structural schematic diagram of two rolling mechanisms performing bidirectional synchronous rolling on a workpiece.

[0021] Figure 4 for Figure 3 Exploded diagram.

[0022] Figure 5 A schematic diagram of the structure of the support plate.

[0023] Figure 6 Schematic diagram of the workpiece structure.

[0024] Explanation of the reference numerals: 1-outer support frame; 2-inner support frame; 21-support plate; 3-rolling mechanism; 31-fixed seat; 311-keyway; 312-stud; 32-annular extrusion member; 33-ball retainer; 331-sliding key; 332-circular opening; 34-ball; 35-connecting sleeve; 4-extrusion rotation drive mechanism; 41-linear drive; 42-motor fixing block; 43-rotating motor; 5-stress relief ultrasonic mechanism; 51-ultrasonic controller; 52-ultrasonic fixing clamp; 53-top screw; 6-workpiece; 61-rounded corner. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] See also Figures 1 to 6The embodiment of the present application provides a device for rounded corner rolling strengthening and stress relief, including an outer support frame 1, an inner support frame 2, a rolling mechanism 3 and an extrusion rotation drive mechanism 4; the outer support frame 1 and the inner support frame 2 are both rectangular support frame bodies, the inner support frame 2 is installed in the outer support frame 1 and is fixed, and the workpiece 6 to be processed is placed on the inner support frame 2 and is fixed. The rolling mechanism 3 is used to roll the rounded corner 61 of the workpiece 6 and perform strengthening treatment. The extrusion rotation drive mechanism 4 is installed on the outer support frame 1 and is supported and fixed, the rolling mechanism 3 is installed at the power output end of the extrusion rotation drive mechanism 4, and is driven by the extrusion rotation drive mechanism 4 to move axially. When the rolling mechanism 3 contacts the rounded corner 61 of the workpiece 6, the extrusion rotation drive mechanism 4 drives the rolling mechanism 3 to rotate circumferentially and causes the rolling mechanism 3 to extrude the rounded corner 61 of the workpiece 6, thereby achieving strengthening treatment of the rounded corner of the workpiece.

[0027] Combination Figure 2 The extrusion rotation drive mechanism 4 includes a linear drive 41, a motor fixing block 42 and a rotary motor 43 which are sequentially arranged and connected. The linear drive 41 adopts a hydraulic cylinder. The motor fixing block 42 is connected to the telescopic rod of the hydraulic cylinder and moves linearly with the telescopic rod. The motor seat of the rotary motor 43 is connected to the motor fixing block 42 and moves linearly with the motor fixing block 42. The rolling mechanism 3 is connected to the motor shaft of the rotary motor 43 and rotates with the motor shaft. When the telescopic rod of the hydraulic cylinder is extended, the telescopic rod drives the motor fixing block 42, the rotary motor 43 and the rolling mechanism 3 to move toward the workpiece side until the rolling mechanism 3 contacts and squeezes the surface of the rounded corner of the workpiece; the rotary motor 43 is started, and the rotary motor 43 drives the rolling mechanism 3 to rotate to achieve the rolling of the rounded corner of the workpiece.

[0028] Combination Figure 3 and Figure 4The rolling mechanism 3 includes a fixed seat 31, an annular extrusion piece 32, a ball cage 33, a plurality of balls 34 and a connecting sleeve 35. One end of the connecting sleeve 35 is key-connected to the motor shaft of the rotating motor 43 to achieve torque transmission; the other end of the connecting sleeve 35 is provided with an internal thread, and one end of the fixed seat 31 is provided with a stud 312. The connecting sleeve 35 and the fixed seat 31 are threadedly connected to facilitate the disassembly and replacement of the rolling mechanism 3. The other end of the fixed seat 31 is a circular cover structure, and a plurality of key slots 311 are evenly opened on the inner circumferential wall of the fixed seat 31 along the circumferential direction. The ball cage 33 is an annular structure, and a plurality of sliding keys 331 matching the key slots 311 are provided on the outer circumferential wall of the ball cage 33. The ball cage 33 is installed in the fixed seat 31 and can slide along the central axis direction of the fixed seat 31. In addition, the ball retainer 33 is evenly provided with a plurality of circular openings 332 along the circumferential direction, and a ball 34 is arranged in each circular opening 332. The ball 34 can rotate freely in the circular opening 332, and the plurality of balls 34 can move synchronously under the drive of the ball retainer 33, thereby accelerating the rolling speed of the rounded corners of the workpiece and improving the processing efficiency. The annular extrusion piece 32 is coaxially arranged between the fixed seat 31 and the ball retainer 33, and the end of the annular extrusion piece 32 facing the fixed seat 31 is a plane, which is convenient for the smooth transmission of the axial force, and the end of the annular extrusion piece 32 facing the ball retainer 33 protrudes outward and is inserted into the central opening of the ball retainer 33, and the ball retainer 33 radially positions the annular extrusion piece 32 to ensure that the annular extrusion piece 32 does not move. In addition, an arc-shaped extrusion surface is provided at the protruding end of the annular extrusion member 32, and the arc-shaped extrusion surface of the annular extrusion member 32 contacts and squeezes the ball 34. When the annular extrusion member 32 is subjected to an axial force, the arc-shaped extrusion surface of the annular extrusion member 32 converts the axial force into an extrusion force perpendicular to the surface of the ball 34, and transmits it to the workpiece 6 via the ball 34, so that the fillet 61 of the workpiece 6 is subjected to an extrusion force perpendicular to the surface of the fillet 61.

[0029] In this embodiment, the workpiece 6 can be Figure 6The special-shaped part shown in the figure is placed on the upper surface of the inner support frame 2 and fixed. When the rounded corner of the workpiece needs to be rolled, the telescopic rod of the hydraulic cylinder extends and drives the motor fixing block 42, the rotating motor 43 and the rolling mechanism 3 to move downward, and the ball 34 contacts the rounded corner 61 of the workpiece 6. The fixed seat 31 generates an axial extrusion force on the annular extrusion member 32 under the drive of the hydraulic cylinder. The annular extrusion member 32 transmits this axial extrusion force to the ball 34, and the ball 34 squeezes the rounded corner 61 of the workpiece 6. At the same time, the annular extrusion member 32 converts this axial extrusion force into an extrusion force perpendicular to the rounded corner of the workpiece. Start the rotating motor 43, the rotating motor 43 drives the fixed seat 31 to rotate circumferentially, and the torque of the rotation of the fixed seat 31 is transmitted to the ball 34 via the ball retainer 33. The ball 34 rotates circumferentially on the surface of the rounded corner of the workpiece, so that the rounded corner 61 of the workpiece 6 is rolled and strengthened. This embodiment can realize the rolling of the rounded corner of the workpiece only by the design of the rolling mechanism 3 and the extrusion rotation drive mechanism 4, without manual operation, with high automation and high work efficiency. In addition, since the connecting sleeve 35 and the fixing seat 31 are connected in a detachable manner, when facing workpieces of different sizes and models, the rolling mechanism 3 can be replaced to adapt to the rolling of the fillets of workpieces of different models or different fillet diameters.

[0030] Combination Figure 2 , when the fillets on the upper and lower surfaces of the workpiece need to be rolled and strengthened, the rolling mechanism 3 and the extrusion rotary drive mechanism 4 in this embodiment are two sets, and are arranged one by one, that is, each extrusion rotary drive mechanism 4 corresponds to a rolling mechanism 3, and the two sets of mechanisms are symmetrically arranged on the upper and lower surfaces of the workpiece; when the two rolling mechanisms 3 move synchronously, and the balls 34 squeeze the fillets 61 of the workpiece 6, the fillets on both sides of the workpiece are rolled and strengthened, and the two-way rolling and strengthening treatment of the workpiece is achieved. It should also be noted that since both sides of the workpiece are rolled synchronously, the fillets on the upper and lower surfaces of the workpiece need to be exposed, so the support plate 21 in the inner support frame 2 used to support the workpiece has an opening, and the workpiece and the opening of the support plate 21 are interference fit to achieve fixation.

[0031] Combination Figure 1 and Figure 2In order to achieve stress relief of the workpiece during the rolling strengthening stage, the present embodiment also includes a stress relief ultrasonic mechanism 5, which is arranged on one side of the workpiece and installed on the outer support frame 1. The stress relief ultrasonic mechanism 5 includes an ultrasonic controller 51, an ultrasonic fixing clamp 52 and two top screws 53, one end of the ultrasonic fixing clamp 52 is connected to the ultrasonic controller 51 via a wire, and the other end is clamped on the support plate 21 of the inner support frame 2 and fixed by two top screws 53. When the ultrasonic controller 51 generates ultrasonic waves, the ultrasonic waves are transmitted to the workpiece via the wire, the ultrasonic fixing clamp 52 and the support plate 21 to achieve stress relief in the rounded corner rolling strengthening stage of the workpiece. In addition, the ultrasonic controller 51 can control and detect the entire ultrasonic process to achieve a better residual stress removal effect. That is, while rolling the rounded corners of the workpiece, the residual stress is also removed, which improves the quality of the workpiece and reduces the safety hazards of the workpiece.

[0032] The working process of the present invention is further described below to further demonstrate the working principle and advantages of the present invention:

[0033] S1, the workpiece to be processed is mounted on the support plate 21 of the inner support frame 2 and fixed.

[0034] S2, clamp the ultrasonic fixing clamp 52 in the stress relief ultrasonic mechanism 5 on the support plate 21 of the inner support frame 2 and fix it with the top screw 53; start the ultrasonic controller 51 and put it in working state.

[0035] S3, start the hydraulic cylinders in the two extrusion rotation drive mechanisms 4 synchronously, the telescopic rods of the hydraulic cylinders extend and drive the corresponding motor fixing blocks 42, the rotating motors 43 and the rolling mechanism 3 to move, the balls 34 on both sides of the workpiece contact the fillets on both sides of the workpiece respectively, the fixed seat 31 generates an axial extrusion force on the annular extrusion member 32 under the drive of the hydraulic cylinder, the annular extrusion member 32 transmits this axial extrusion force to the balls 34, and the balls 34 extrude the fillets 61 of the workpiece 6. At the same time, the annular extrusion member 32 converts this axial extrusion force into an extrusion force perpendicular to the fillet of the workpiece. Start the rotating motor 43, the rotating motor 43 drives the fixed seat 31 to rotate circumferentially, the torque of the rotation of the fixed seat 31 is transmitted to the balls 34 via the ball retainer 33, and the balls 34 rotate circumferentially on the surface of the fillet of the workpiece, so that the fillets on both sides of the workpiece are rolled and strengthened.

[0036] The workpiece fillet of the present invention removes residual stress through ultrasonic equipment during the rolling process, so that the residual stress of the workpiece after strengthening is controlled within a reasonable range, the strength of the workpiece is improved, the initiation of cracks is suppressed, and the overall safety factor is improved.

[0037] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A device for rounded corner rolling strengthening and stress relief, characterized in that: It includes a rolling mechanism for rolling the rounded corners of a workpiece, an extrusion and rotation driving mechanism for circumferential rotation of the rolling mechanism and providing axial force to the rolling mechanism, and also includes a stress relief ultrasonic mechanism for removing residual stress of the workpiece; The rolling mechanism includes a fixed seat, an annular extrusion piece, a ball cage and a ball. The power output end of the extrusion rotation drive mechanism is connected to the fixed seat and drives the fixed seat to rotate circumferentially and move axially. The annular extrusion piece and the ball cage are movably installed in the fixed seat in turn and can rotate circumferentially and move axially with the fixed seat. The ball is installed on the ball cage and can roll. When the extrusion rotation drive mechanism drives the fixed seat to move axially, the annular extrusion piece and the ball cage move axially with the fixed seat until the annular extrusion piece contacts and squeezes the ball, and the ball contacts and squeezes the rounded corner of the workpiece. The extrusion rotation drive mechanism drives the ball to rotate circumferentially to roll the rounded corner of the workpiece and strengthen it. The stress relief ultrasonic mechanism connects the workpiece and transmits ultrasonic waves to remove the residual stress of the workpiece during the rolling strengthening stage.

2. The device for rounded corner rolling strengthening and stress relief according to claim 1, characterized in that: The fixed seat is a circular cover structure with a keyway on the inner circumferential wall of the fixed seat. The ball retainer is an annular structure with a sliding key matching the keyway on the outer circumferential wall of the ball retainer. The ball retainer is installed in the fixed seat and can slide along the central axis of the fixed seat.

3. The device for rounded corner rolling strengthening and stress relief according to claim 1, characterized in that: The ball retainer is provided with a plurality of circular openings along the circumferential direction, and the balls are installed in the circular openings and can roll.

4. The device for rounded corner rolling strengthening and stress relief according to claim 1, characterized in that: One end of the annular extrusion piece facing the fixing seat is a plane, and one end of the annular extrusion piece facing the ball retainer is provided with an arcuate extrusion surface, which contacts and extrudes the ball.

5. The device for rounded corner rolling strengthening and stress relief according to claim 1, characterized in that: The extrusion rotation drive mechanism includes a linear drive and a rotary motor. The motor seat of the rotary motor is connected to the telescopic rod of the linear drive and moves linearly with the telescopic rod. The fixed seat is connected to the motor shaft of the rotary motor and rotates with the motor shaft.

6. The device for rounded corner rolling strengthening and stress relief according to claim 5, characterized in that: The linear actuator is a hydraulic cylinder.

7. The device for rounded corner rolling strengthening and stress relief according to claim 5, characterized in that: The rolling mechanism also includes a connecting sleeve, one end of which is connected to the motor shaft key of the rotating motor, and the other end of which is detachably connected to the fixing seat.

8. A device for rounded corner rolling strengthening and stress relief according to any one of claims 1 to 7, characterized in that: There are two rolling mechanisms and two extrusion rotary drive mechanisms, one extrusion rotary drive mechanism and one rolling mechanism form a group, and the two groups are symmetrically arranged on both sides of the workpiece and move synchronously; when the balls of the two rolling mechanisms synchronously extrude the fillets on both sides of the workpiece, the fillets on both sides of the workpiece are rolled and strengthened.

9. The device for rounded corner rolling strengthening and stress relief according to claim 8, characterized in that: The stress relief ultrasonic mechanism includes an ultrasonic controller and an ultrasonic fixing clamp. One end of the ultrasonic fixing clamp is connected to the ultrasonic controller, and the other end is connected to the workpiece. When the ultrasonic controller generates ultrasonic waves, the ultrasonic waves are transmitted to the workpiece via the ultrasonic fixing clamp to achieve stress relief in the workpiece fillet rolling strengthening stage.

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