An automatic rotary punch riveting die

Abstract

The present application relates to the field of machining equipment, especially to an automatic rotary stamping and riveting die. It comprises a rotary machine table, stamping tools, riveting tools and a feeding device. The rotary machine table comprises a rotating table and a fixed table, the rotating table is rotatably arranged on the fixed table. There are three stamping tools and one riveting tool. The stamping tools and the riveting tool are arranged along the rotating table in a circular manner. There are processing holes on the rotating table corresponding to the stamping tools and the riveting tool. There is a blanking hole on the fixed table corresponding to the riveting tool. The feeding device is arranged corresponding to the stamping tools and the riveting tool. Through the cooperation of multiple stamping tools and riveting tools on the same machine table, the synchronous processing of multiple pieces of workpieces can be realized. By keeping the punched workpiece in the processing hole, the stacked workpieces after multiple punching will not deviate under the limiting of the processing hole, which is convenient for subsequent riveting positioning.

Description

Technical Field

[0001] This invention relates to the field of machining equipment, and more particularly to an automatic rotary stamping and riveting die. Background Technology

[0002] Taking the existing stamping and riveting process for multi-piece workpieces as an example, the traditional processing method involves continuously punching and cutting a strip of material with a stamping fixture to form multiple workpieces. Workers then transfer the workpieces to a riveting fixture, stacking them in a fixed number, and finally riveting them together to complete production. Because the processing times of the stamping and riveting fixtures are not matched, production is discontinuous. Furthermore, the subsequent workpiece transfer and stacking by workers results in a long pre-riveting processing time. Deviations are also prone to occur during workpiece stacking, affecting production quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic rotary stamping and riveting mold that can perform multi-station synchronous processing, ensure accurate workpiece stacking, and achieve high processing quality.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an automatic rotary stamping and riveting die, comprising a rotary table, stamping fixtures, riveting fixtures, and a feeding device; the rotary table includes a rotating platform and a fixed platform, the rotating platform being rotatably mounted on the fixed platform; three stamping fixtures are provided, and one riveting fixture is provided; the stamping fixtures and riveting fixtures are arranged at intervals along the circumference of the rotating platform; the rotating platform is provided with processing holes corresponding to the stamping fixtures and riveting fixtures; the fixed platform is provided with blanking holes corresponding to the riveting fixtures; the feeding device is arranged corresponding to the stamping fixtures and riveting fixtures.

[0005] Furthermore, it also includes a material clamping device, which includes a material clamping seat and a material clamping block; a movable cavity communicating with the lower side of the machining hole is provided on the rotating platform, and the material clamping seat is movable along the height direction of the movable cavity; a spring is provided between the lower side of the material clamping seat and the movable cavity; a first mounting groove is provided on the inner walls of both sides of the machining hole, and the material clamping block is rotatably disposed in the first mounting groove; a torsion spring is provided on the material clamping block; one end of the material clamping block protrudes from the inner wall of the machining hole; the straight-line distance from the rotation center of the material clamping block to its protruding end is greater than its distance to the upper inner wall of the first mounting groove, but less than its distance to the lower inner wall of the first mounting groove.

[0006] Furthermore, the stamping fixture includes a punch, a first driving device, and a second driving device. The first driving device is connected to the punch and drives it to move toward the machining hole. A pressure block is provided in the middle of the punch, and the second driving device is connected to the pressure block and drives it to move along the height direction of the punch.

[0007] Furthermore, it also includes a third driving device. The inner walls of both sides of the moving cavity are provided with second mounting grooves, and the third driving device is installed within the second mounting grooves. The clamping seat includes a clamping housing, a blanking plate, a first connecting rod, and a moving plate. Two blanking plates are provided on the upper side of the clamping housing, and the two blanking plates are respectively hinged to the two sides of the clamping housing. The blanking plates are rotatable towards the inner side of the clamping housing. The moving plate is located on the side of the clamping housing opposite to the inner walls of the moving cavity. The moving plate is movable towards the inner wall of the adjacent moving cavity, and the moving plate is hinged to the adjacent blanking plate via the first connecting rod. The side of the moving plate near the inner wall of the moving cavity is detachably connected to the driving end of the third driving device. The lower side of the clamping housing is provided with a hollowed-out portion for workpiece ejection.

[0008] Furthermore, the movable plate is provided with a first hook protruding from the side of the material housing, the first hook being bent downwards; the inner wall of the movable cavity is provided with a clearance groove along its height direction corresponding to the first hook; the driving end of the third driving device is provided with a second hook, the second hook being located in the clearance groove and bent upwards; the first hook and the second hook cooperate with each other.

[0009] Furthermore, it also includes a pressing device, which includes a movable base, a second connecting rod, and a drive gear; a third mounting groove is provided on the inner walls of both sides of the movable cavity, and the third mounting groove is located above the second mounting groove; the drive gear is rotatably provided in the third mounting groove; the clamping base also includes a rotating shaft, which is located at the upper edge of both sides of the clamping housing, the material dropping plate is connected to the rotating shaft, and the rotating shaft is hinged to the clamping housing; an incomplete gear is provided on the rotating shaft; the incomplete gear cooperates with the drive gear; one end of the second connecting rod is eccentrically connected to the drive gear, and the other end is connected to the movable base; the clamping block is provided on the movable base, and the movable base is movable along the height direction of the first mounting groove.

[0010] Furthermore, the clamping block is L-shaped, and its two ends abut against the upper end face and side face of the workpiece inside the machining hole, respectively.

[0011] Furthermore, the pressing device also includes a limiting fork, which is disposed in the third mounting groove. The fork head of the limiting fork is engaged with the part of the second connecting rod and the drive gear. The end of the limiting fork away from the fork head is connected to the inner wall of the third mounting groove by a spring. A transmission rod is provided on the lower side of the limiting fork. The second mounting groove is provided with a moving hole along its length direction. The moving block communicates with the third mounting groove. The transmission rod extends through the moving hole into the second mounting groove. The projection of the moving plate in the length direction of the second mounting groove coincides with the transmission rod.

[0012] The beneficial effects of this invention are as follows: by cooperating with multiple sets of stamping and riveting fixtures on the same machine, synchronous processing of multi-piece workpieces can be achieved; during equipment processing, the feeding device corresponding to the three stamping fixtures conveys the material strip towards the corresponding processing hole, and then the stamping fixture punches the single workpiece into the processing hole, and then the rotary table rotates; after the rotary table rotates through the circumference corresponding to the three processing holes, a specified number of workpieces are punched in the processing hole close to the riveting fixture along the rotation direction. The workpiece is then rotated by the rotary table to the underside of the riveting fixture, where it is riveted and squeezed out of the dropping hole of the fixed table; compared with the traditional process of collecting the workpieces after punching a single strip and then riveting them again, this design keeps the punched workpieces in the processing hole, and the stacked workpieces after multiple punchings will not shift under the limit of the processing hole, which facilitates subsequent riveting positioning. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an automatic rotary stamping and riveting die according to a specific embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the punch and pressure block of the automatic rotary stamping and riveting die according to a specific embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the fixed platform of the automatic rotary stamping and riveting die according to a specific embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the material clamping device for an automatic rotary stamping and riveting die according to a specific embodiment of the present invention;

[0017] Figure 5 This is a cross-sectional view of the automatic rotary stamping and riveting die when the clamping device and the machining hole and moving cavity are engaged, which is a structural schematic diagram of a specific embodiment of the present invention.

[0018] Label Explanation:

[0019] 1. Rotating machine table; 11. Rotating table; 111. Machining hole; 112. Moving cavity; 12. Fixed table; 121. Discharge hole;

[0020] 2. Stamping fixture; 21. Punch; 22. Press block;

[0021] 3. Riveting fixtures; 4. Feeding device;

[0022] 5. Material clamping device;

[0023] 51. Material clamping seat; 511. Material clamping housing; 512. Material dropping plate; 513. First connecting rod; 514. Moving plate; 5141. First hook; 515. Incomplete gear; 52. Material clamping block;

[0024] 6. Third drive unit; 61. Second latch;

[0025] 7. Pressing device; 71. Moving seat; 72. Second connecting rod; 73. Drive gear; 74. Limiting fork; 741. Transmission rod; 8. Workpiece. Detailed Implementation

[0026] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] Please refer to Figures 1 to 5 An automatic rotary stamping and riveting die includes a rotary table 1, a stamping fixture 2, a riveting fixture 3, and a feeding device 4. The rotary table 1 includes a rotating platform 11 and a fixed platform 12, with the rotating platform 11 rotatably mounted on the fixed platform 12. There are three stamping fixtures 2 and one riveting fixture 3. The stamping fixtures 2 and riveting fixtures 3 are spaced apart circumferentially along the rotating platform 11. The rotating platform 11 has machining holes 111 corresponding to the stamping fixtures 2 and riveting fixtures 3. The fixed platform 12 has blanking holes 121 corresponding to the riveting fixtures 3. The feeding device 4 is arranged corresponding to the stamping fixtures 2 and riveting fixtures 3.

[0028] As can be seen from the above description, the beneficial effects of the present invention are as follows: by cooperating with multiple sets of stamping fixtures 2 and riveting fixtures 3 on the same machine, synchronous processing of multi-piece workpieces 8 can be achieved; during equipment processing, the feeding device 4 corresponding to the three stamping fixtures 2 conveys the material strip towards the corresponding processing hole 111, and then the stamping fixtures 2 punch and cut to make the single workpiece 8 fall into the processing hole 111, and then the rotating table 11 rotates; after the rotating table 11 rotates through the circumference corresponding to the three processing holes 111, along the rotation direction A predetermined number of workpieces 8 are punched into the machining hole 111 near the riveting fixture 3. The workpieces 8 are then rotated by the rotating table 11 to the underside of the riveting fixture 3, where they are riveted and squeezed out of the discharge hole 121 of the fixed table 12. Compared with the traditional process of punching a single strip and collecting the workpieces 8 for re-riveting, this design keeps the punched workpieces 8 in the machining hole 111. The stacked workpieces 8 after multiple punchings will not shift under the limit of the machining hole 111, which facilitates the subsequent riveting positioning.

[0029] Furthermore, it also includes a clamping device 5, which includes a clamping seat 51 and a clamping block 52; the rotating table 11 has a moving cavity 112 communicating with the lower side of the machining hole 111, and the clamping seat 51 is movable along the height direction of the moving cavity 112; a spring is provided between the lower side of the clamping seat 51 and the moving cavity 112; a first mounting groove is provided on the inner walls of both sides of the machining hole 111, and the clamping block 52 is rotatably disposed in the first mounting groove; a torsion spring is provided on the clamping block 52; one end of the clamping block 52 protrudes from the inner wall of the machining hole 111; the straight-line distance from the rotation center of the clamping block 52 to its protruding end is greater than its distance to the upper inner wall of the first mounting groove, but less than its distance to the lower inner wall of the first mounting groove.

[0030] As described above, the design of the clamping seat 51 and the clamping block 52 enables the punched workpiece 8 to be fixed at a certain height within the machining hole 111. If the punched workpiece 8 cannot be stacked at a certain height, then when the depth of the machining hole 111 is constant, each punched workpiece 8 needs to fall to the bottom of the machining hole 111 to accurately stack with the previous workpiece 8. During the falling process, the workpiece 8 may get stuck in the machining hole 111 due to angle, edge roughness, etc., which will lead to the subsequent riveting process, where multiple workpieces 8 need to be stacked during riveting. However, using the punch 21 to accurately press the workpiece 8 down to the bottom of the machining hole 111 would result in an excessively long downward movement distance of the punch 21, and the downward movement distance of the punch 21 in each stamping fixture 2 would be different, making the design complex. In this design, since each punched workpiece 8 can be kept at a certain height in the machining hole 111 without falling to the bottom of the machining hole 111, the punch 21 can press the workpiece 8 to the height position of the machining hole 111 when it moves down. The downward movement distance of the punch 21 does not need to be too long and can be kept consistent.

[0031] Specifically, when the stamping fixture 2 punches the strip conveyed by the feeding device 4 toward the processing hole 111, the punched workpiece 8 is pressed into the processing hole 111 by the downward punch 21. It is rotated into the first mounting groove by the workpiece 8 and the punch 21 pressed by the clamping block 52. The workpiece 8 is then pressed down onto the clamping seat 51. Then the punch 21 rises, and the clamping seat 51 pushes the workpiece 8 upward under the action of the spring. The clamping block 52 returns to its original position and protrudes from the inner wall of the processing hole 111 under the action of the torsion spring. The upper end of the upward-moving workpiece 8 is held by the clamping block 52, while the lower end is continuously pressed by the clamping seat 51 and thus fixed at a certain height in the processing hole 111.

[0032] During the next stamping, the new workpiece 8 and the punch 21 move down together into the machining hole 111. The clamping block 52 is pressed by the workpiece 8 and the punch 21 and rotates into the first mounting slot. The new workpiece 8 moves down onto the previous workpiece 8, and is buffered by the spring of the clamping seat 51. Then the punch 21 rises, and the clamping seat 51 pushes the two workpieces 8 up under the action of the spring. The clamping block 52 returns to its original position and protrudes from the inner wall of the machining hole 111 under the action of the torsion spring. The uppermost part of the two workpieces 8 that move up will be pressed by the clamping block 52, and the lower part will be continuously pressed by the clamping seat 51 and thus fixed at a certain height in the machining hole 111.

[0033] In the two stamping processes mentioned above, the downward movement distance of the punch 21 of different stamping fixtures 2 can be consistent and no adjustment is required.

[0034] The setting of the straight-line distance between the rotation center and the protruding end of the clamping block 52, as well as the distance from the rotation center to the upper and lower inner walls of the first mounting groove, ensures that when the clamping block 52 rotates upward, its protruding end will abut against the upper inner wall of the first mounting groove and cannot rotate, thus preventing the workpiece 8 from being removed from the machining hole 111 from bottom to top.

[0035] Furthermore, the stamping fixture 2 includes a punch 21, a first driving device and a second driving device. The first driving device is connected to the punch 21 and drives it to move toward the machining hole 111. A pressure block 22 is provided in the middle of the punch 21. The second driving device is connected to the pressure block 22 and drives it to move along the height direction of the punch 21.

[0036] As described above, when the punch 21 is punching, the first driving device drives the punch 21 to move downward. When the punch 21 rises, the pressure block 22 in the middle of the punch 21 will move under the action of the second driving device and protrude from the lower end face of the punch 21, so that the punch 21 and the workpiece 8 maintain a certain distance. This distance allows the clamping block 52, which is no longer pressed by the punch 21 and rotates toward the first mounting groove, to return to the state of protruding from the machining hole 111 through the torsion spring. This then holds the upper end of the workpiece 8, which has moved upward by the spring of the clamping seat 51, and fixes the workpiece 8 at a certain height in the machining hole 111.

[0037] Furthermore, it also includes a third driving device 6. The inner walls on both sides of the moving cavity 112 are provided with second mounting grooves, and the third driving device 6 is installed within the second mounting grooves. The material clamping base 51 includes a material clamping housing 511, a material dropping plate 512, a first connecting rod 513, and a moving plate 514. Two material dropping plates 512 are provided on the upper side of the material clamping housing 511. The two material dropping plates 512 are respectively hinged to the two sides of the material clamping housing 511, and the material dropping plates 512 face inwards towards the inside of the material clamping housing 511. It is rotatable; the movable plate 514 is disposed on the side opposite to the inner wall of the two sides of the material clamping housing 511 and the moving cavity 112, the movable plate 514 is movable toward the inner wall of the adjacent moving cavity 112, the movable plate 514 and the adjacent dropping plate 512 are hinged by the first connecting rod 513; the side of the movable plate 514 near the inner wall of the moving cavity 112 is detachably connected to the driving end of the third driving device 6; the lower side of the material clamping housing 511 is provided with a hollow part for the workpiece 8 to fall out.

[0038] As described above, when the workpiece 8 is continuously stacked to three pieces or a fixed number of pieces and riveted by the riveting fixture 3, under the pressure of the clamping block 52 on the upper end of the stacked workpiece 8, the clamping seat 51 moves down a certain height in the moving cavity 112. The third driving device 6 set in the second mounting groove corresponds to this height, so that after the clamping seat 51 moves down, the moving plates 514 on both sides can be connected to the driving end of the adjacent third driving device 6. Then, under the horizontal movement of the driving end of the third driving device 6, the moving plates 514 move towards the second mounting groove. The moving plates 514 drive the first connecting rod 513 and the dropping plate 512 on the clamping seat 51 to move. The two dropping plates 512 rotate towards the inside of the clamping shell 511 of the clamping seat 51. After the rotation, a gap will be generated between the dropping plates 512. This gap allows the workpiece 8 to fall directly out without being blocked by the dropping plate 512. Finally, it falls into the dropping hole 121 of the fixed table 12 from the hollow of the clamping shell 511.

[0039] Then, the drive end of the third drive device 6 returns to its original position, the moving plate 514 returns to the side of the clamping housing 511, and the dropping plate 512 rotates to a horizontal position to receive the next workpiece 8 that falls in; and under the action of the spring, the clamping seat 51 moves upward, and the moving plate 514 is disconnected from the drive end of the third drive device 6. Then, under the rotation of the rotating table 11, the above-mentioned machining hole 111 and the corresponding device in the machining hole 111 can be rotated to the initial stamping fixture 2 to continue the next stamping and riveting process.

[0040] Furthermore, the movable plate 514 is provided with a first hook 5141 protruding from the side of the clamping housing 511, and the first hook 5141 is bent downwards; the inner wall of the movable cavity 112 is provided with a clearance groove along its height direction corresponding to the first hook 5141, and the driving end of the third driving device 6 is provided with a second hook 61, the second hook 61 is located in the clearance groove and the second hook 61 is bent upwards; the first hook 5141 and the second hook 61 cooperate with each other.

[0041] As described above, when the material holder 51 moves down, the first hook 5141 of the moving plate 514 moves along the relief groove. Due to the abutment between the relief groove and the first hook 5141, the moving plate 514 will not move toward the inner wall of the moving cavity 112, thereby fixing the first connecting rod 513 and the dropping plate 512. When the material holder 51 moves down a certain height, the first hook 5141 of the moving plate 514, due to its shape design, cooperates with the second hook 61 of the driving end of the third driving device 6. Subsequently, under the drive of the driving end of the third driving device 6, the moving plate 514 can move toward the inside of the second mounting groove.

[0042] Furthermore, it also includes a pressing device 7, which includes a movable base 71, a second connecting rod 72, and a drive gear 73; the inner walls on both sides of the movable cavity 112 are provided with a third mounting groove, which is located above the second mounting groove; the drive gear 73 is rotatably provided in the third mounting groove; the clamping seat 51 also includes a rotating shaft, which is located at the upper edges on both sides of the clamping housing 511; the dropping plate 512 is connected to the rotating shaft, and the rotating shaft is hinged to the clamping housing 511; an incomplete gear 515 is provided on the rotating shaft; the incomplete gear 515 cooperates with the drive gear 73; one end of the second connecting rod 72 is eccentrically connected to the drive gear 73, and the other end is connected to the movable base 71; the clamping block 52 is provided on the movable base 71, and the movable base 71 is movable along the height direction of the first mounting groove.

[0043] As can be seen from the above description, when the two blanking plates 512 rotate toward the inside of the clamping housing 511 so that the gap between them is sufficient for the workpiece 8 to fall, the workpiece 8 may not be able to be clamped in the processing hole 111 and cannot fall directly due to friction between the workpiece 8 and the wall of the processing hole 111. At this time, the pressing device 7 can be used to assist in pressing, so that the workpiece 8 leaves the clamping position and falls.

[0044] Specifically, when the moving plate 514 moves to the point where the gap between the two dropping plates 512 meets the requirements for the workpiece 8 to fall, the moving plate 514 continues to move, causing the rotating shaft connected to the dropping plate 512 to continue rotating. At this time, the incomplete gear 515 on the rotating shaft will cooperate with the drive gear 73 of the pressing device 7, driving the drive gear 73 to rotate. The second connecting rod 72 eccentrically set on the drive gear 73 will drive the moving seat 71 and the clamping block 52 to move downward under the rotation of the drive gear 73, so that the clamping block 52 presses down on the upper end of the workpiece 8, and the workpiece 8 is released from the clamping position and falls smoothly.

[0045] After the workpiece 8 falls out, the drive end of the third drive device 6 returns, the moving plate 514 returns to the side of the clamping housing 511, the dropping plate 512 rotates to a horizontal state, and during the rotation of the dropping plate 512, the incomplete gear 515 of the rotating shaft connected to it drives the drive gear 73 to rotate, thereby resetting the second connecting rod 72, the moving seat 71 and the clamping block 52.

[0046] Furthermore, the clamping block 52 is L-shaped, and its two ends abut against the upper end face and side face of the workpiece 8 in the machining hole 111, respectively.

[0047] As described above, by setting the L-shaped clamping block 52, when the workpiece 8 rises from the punch 21, one side of the workpiece 8 is clamped into the L-shaped clamping block 52. The two ends of the L-shaped clamping block 52 abut against the upper end and the side of the workpiece 8 respectively to fix the height position of the workpiece 8 in the machining hole 111. When the workpiece 8 is engaged with the clamping block 52, the workpiece 8 tends to move upward under the spring push of the lower clamping seat 51. When the workpiece 8 moves upward, the L-shaped clamping block 52 tends to rotate, but this rotation direction is blocked by the side of the workpiece 8 and the upper inner wall of the first mounting groove, thereby reliably fixing the workpiece 8.

[0048] Furthermore, the pressing device 7 also includes a limiting fork 74, which is disposed in the third mounting groove. The fork head of the limiting fork 74 is engaged with the part of the second connecting rod 72 and the drive gear 73. The end of the limiting fork 74 away from the fork head is connected to the inner wall of the third mounting groove by a spring. A transmission rod 741 is provided on the lower side of the limiting fork 74. The second mounting groove is provided with a moving hole along its length direction. The moving block communicates with the third mounting groove. The transmission rod 741 extends through the moving hole into the second mounting groove. The projection of the moving plate 514 in the length direction of the second mounting groove coincides with the transmission rod 741.

[0049] As described above, the design of the limiting fork 74 prevents the drive gear 73 from rotating freely when the rotating table 11 rotates, thus affecting the jamming of the clamping block 52. During the movement of the moving plate 514 to a position where the gap between the two dropping plates 512 is sufficient for the workpiece 8 to fall, it will abut against the transmission rod 741 of the limiting fork 74, thereby driving the transmission rod 741 and the limiting fork 74 to move. This releases the clamping of the fork head of the limiting fork 74 on the connection between the second connecting rod 72 and the drive gear 73, allowing the drive gear 73 to rotate. Then, the moving plate 514 moves to a position where the gap between the two dropping plates 512 is sufficient for the workpiece 8 to fall, and the incomplete gear 515 of the rotating shaft rotates to engage with the drive gear 73, thereby completing the subsequent pressing of the pressing device 7.

[0050] After the workpiece 8 falls out, the drive end of the third drive device 6 is reset. During the reset process, the moving plate 514 first drives the dropping plate 512 to rotate, causing the rotating shaft and the incomplete gear 515 to rotate, which in turn drives the drive gear 73 to reset. Then the moving plate 514 is reset to the side of the clamping housing 511, and the limiting fork 74 returns to the part that clamps the second connecting rod 72 and the drive gear 73 under the action of its spring.

[0051] Reference Figures 1 to 5 Embodiment 1 of the present invention is as follows:

[0052] Application scenario of the present invention: In the traditional stamping and riveting process of multi-piece workpiece 8, the processing time of stamping fixture 2 and riveting fixture 3 cannot be matched, resulting in discontinuous production; and workers need to transfer and stack workpiece 8 afterward, which takes a long time to process workpiece 8 before riveting; deviations are also easy to occur when stacking workpiece 8, affecting production quality.

[0053] like Figures 1 to 5 As shown, the automatic rotary stamping and riveting die of this embodiment includes a rotary table 1, a pressing device, a stamping fixture 2, a riveting fixture 3, a feeding device 4, a clamping device 5, a third driving device 6, and a pressing device 7.

[0054] The rotating platform 1 includes a rotating platform 11 and a fixed platform 12, with the rotating platform 11 rotatably mounted on the fixed platform 12. The pressing device is located above the rotating platform 1, and the pressing device is equipped with three stamping fixtures 2 and one riveting fixture 3. The stamping fixtures 2 and the riveting fixture 3 are arranged circumferentially along the rotating platform 11. The rotating platform 11 is provided with machining holes 111 corresponding to the stamping fixtures 2 and the riveting fixture 3. The fixed platform 12 is provided with a material discharge hole 121 corresponding to the riveting fixture 3. The feeding device 4 is arranged corresponding to the stamping fixtures 2 and the riveting fixture 3.

[0055] like Figure 2As shown, specifically, the stamping fixture 2 includes a punch 21, a first driving device and a second driving device. The first driving device is connected to the punch 21 and drives it to move toward the machining hole 111. A pressure block 22 is provided in the middle of the punch 21. The second driving device is connected to the pressure block 22 and drives it to move along the height direction of the punch 21.

[0056] like Figure 4 and Figure 5 As shown, the clamping device 5 includes a clamping seat 51 and a clamping block 52; a moving cavity 112 communicating with the lower side of the machining hole 111 is provided on the rotating table 11, and the clamping seat 51 is movable along the height direction of the moving cavity 112; a spring is provided between the lower side of the clamping seat 51 and the moving cavity 112; a first mounting groove is provided on the inner walls of both sides of the machining hole 111, and the clamping block 52 is rotatably disposed in the first mounting groove; the clamping block 52 is L-shaped, and its two ends abut against the upper end face and side face of the workpiece 8 in the machining hole 111, respectively. A torsion spring is provided on the clamping block 52; one end of the clamping block 52 protrudes from the inner wall of the machining hole 111; the straight-line distance from the rotation center of the clamping block 52 to its protruding end is greater than its distance to the upper inner wall of the first mounting groove, but less than its distance to the lower inner wall of the first mounting groove.

[0057] like Figure 5 As shown, the inner walls of both sides of the moving cavity 112 are provided with second mounting grooves, and the second mounting grooves are provided with third driving devices 6. The clamping base 51 includes a clamping housing 511, a blanking plate 512, a first connecting rod 513, and a moving plate 514. Two blanking plates 512 are provided on the upper side of the clamping housing 511. The two blanking plates 512 are respectively hinged to the two sides of the clamping housing 511. The blanking plates 512 are rotatable toward the inner side of the clamping housing 511. The moving plate 514 is provided on the side of the clamping housing 511 opposite to the inner walls of the moving cavity 112. The moving plate 514 is movable toward the inner wall of the adjacent moving cavity 112. The moving plate 514 and the adjacent blanking plate 512 are hinged through the first connecting rod 513. The side of the moving plate 514 near the inner wall of the moving cavity 112 is detachably connected to the driving end of the third driving device 6. The lower side of the clamping housing 511 is provided with a hollow part for the workpiece 8 to fall out.

[0058] The detachable connection between the movable plate 514 and the driving end of the third driving device 6 is specifically arranged as follows: the movable plate 514 is provided with a first hook 5141 protruding from the side of the clamping housing 511, and the first hook 5141 is bent downwards; the inner wall of the movable cavity 112 is provided with a clearance groove along its height direction corresponding to the first hook 5141; the driving end of the third driving device 6 is provided with a second hook 61, the second hook 61 is located in the clearance groove and the second hook 61 is bent upwards; the first hook 5141 and the second hook 61 cooperate with each other.

[0059] like Figure 4 and Figure 5 As shown, the pressing device 7 includes a movable base 71, a second connecting rod 72, a drive gear 73, and a limiting fork 74; the inner walls on both sides of the movable cavity 112 are provided with a third mounting groove, which is located above the second mounting groove; the drive gear 73 is rotatably disposed in the third mounting groove; the clamping seat 51 also includes a rotating shaft, which is located at the upper edges on both sides of the clamping housing 511, the dropping plate 512 is connected to the rotating shaft, and the rotating shaft is hinged to the clamping housing 511; an incomplete gear 515 is provided on the rotating shaft; the incomplete gear 515 cooperates with the drive gear 73; one end of the second connecting rod 72 is eccentrically connected to the drive gear 73, and the other end is connected to the movable base 71; specifically, the clamping block 52 is disposed on the movable base 71, and the movable base 71 is movable along the height direction of the first mounting groove.

[0060] The limiting fork 74 is disposed in the third mounting groove. The fork head of the limiting fork 74 is engaged with the part of the second connecting rod 72 and the drive gear 73. The end of the limiting fork 74 away from the fork head is connected to the inner wall of the third mounting groove by a spring. A transmission rod 741 is provided on the lower side of the limiting fork 74. A moving hole along its length direction is provided on the second mounting groove. The moving block communicates with the third mounting groove. The transmission rod 741 extends through the moving hole into the second mounting groove. The projection of the moving plate 514 in the length direction of the second mounting groove coincides with the transmission rod 741.

[0061] The working principle of this invention is as follows: Taking the processing of a machining hole 111 as an example, the machining hole 111 is initially located below the first stamping fixture 2. The pressing device moves down to put each fixture in a ready-to-work state. The feeding device 4 corresponding to the first stamping fixture 2 conveys the material strip to the area above the machining hole 111. The punch 21 of the first stamping fixture 2, driven by the first driving device, presses down toward the machining hole 111. The edge of the punch 21 forms a cutting edge with the edge of the machining hole 111, causing the material strip to be punched into the required workpiece 8. The workpiece 8 falls into the machining hole 111 under the pressure of the punch 21. During the pressing process of the punch 21, the punch 21 and the workpiece 8 will press against the clamping block 52, so that... The clamping block 52 rotates toward the first mounting groove to avoid it; then the workpiece 8 continues to move down and abuts against the upper end face of the clamping seat 51. After that, the punch 21 rises back. During the rise of the punch 21, the second drive device drives the pressure block 22 in the middle of the punch 21 to move and protrude from the lower end of the punch 21, so that a gap is formed between the workpiece 8 and the lower end face of the punch 21. When the punch 21 rises back above the clamping block 52, this gap causes the clamping block 52 to return to the state where one end protrudes from the inner wall of the machining hole 111 under the action of its torsion spring. The workpiece 8, which moves up under the action of the spring of the clamping seat 51, will be held by the clamping block 52 to be fixed at a certain height in the machining hole 111.

[0062] Afterwards, the rotating table 11 rotates, and the machining hole 111 is rotated to the next stamping fixture 2. The feeding device 4 corresponding to the next stamping fixture 2 conveys the material strip, and the stamping fixture 2 presses down to cut the material strip so that the workpiece 8 falls into the machining hole 111. In accordance with the description of the previous working mode, another workpiece 8 is stacked on the previous workpiece 8 and is pressed and fixed at a certain height position in the machining hole 111 by the clamping seat 51 and the clamping block 52.

[0063] The rotary table 11 then continues to rotate, and the machining hole 111 is rotated to the next stamping fixture 2. After the stamping operation, a specified number of three workpieces 8 are fixed in the machining hole 111. As the workpieces 8 continue to stack, since the clamping block 52 is currently fixed in the middle of the inner wall of the machining hole 111, the clamping seat 51 will continue to move downward.

[0064] When three workpieces 8 are fixed between the clamping seat 51 and the clamping block 52, the clamping seat 51 moves down to the second mounting slot. Due to the downward-curved design of the first hook 5141 of the moving plate 514 on both sides of the clamping seat 51, when it moves down to the second mounting slot, the first hook 5141 can engage with the upward-curved second hook 61 of the driving end of the third driving device 6 set in the third mounting slot. At this time, the clamping seat 51 is fixed with the third driving device 6 and the second mounting slot in the height direction.

[0065] Then the rotating table 11 continues to rotate, and the machining hole 111 is rotated to the riveting fixture 3, where the riveting fixture 3 rivets the three workpieces 8 together. After riveting is completed, the third drive device 6 in the second mounting slot drives the moving plate 514 to move toward the second mounting slot. During the movement, the moving plate 514 will press against the transmission rod 741 of the limiting fork 74 that extends into the second mounting slot and drive the transmission rod 741 and the limiting fork 74 to move toward the length direction of the second mounting slot, so that the fork head of the limiting fork 74 disengages from the part where the second connecting rod 72 is connected to the drive gear 73, so that the drive gear 73 is in a rotatable state. Subsequently, due to the continuous movement of the moving plate 514, the moving plate 514 drives the first connecting rod 513 and the blanking plate 512 to move, and the blanking plate 512 rotates toward the clamping housing 511 of the clamping seat 51. When the two blanking plates 512 rotate to the point where the gap between them meets the requirements for the workpiece 8 to fall, the workpiece 8 falls and passes through the hollow part on the lower side of the clamping housing 511 and falls into the blanking hole 121 of the fixed table 12. If the workpiece 8 gets stuck in the machining hole 111 due to surface roughness, the continuously moving moving plate 514 will drive the blanking plate 512 to continue rotating. The incomplete gear 515 on the rotating shaft connected to the blanking plate 512 will rotate to engage with the drive gear 73. The drive gear 73 will rotate and drive the second connecting rod 72, the moving seat 71 and the clamping block 52 to move. Since the moving seat 71 can only move along the height direction of the first mounting groove, the clamping block 52 will move down to press down the workpiece 8 stuck in the machining hole 111 to release it from the stuck state and allow it to fall smoothly into the blanking hole 121 of the fixed table 12.

[0066] The remaining machining holes 111 rotate synchronously and complete the stamping, riveting and blanking according to the above machining method.

[0067] In summary, the automatic rotary stamping and riveting die provided by this invention can achieve synchronous processing of multi-piece workpieces through the cooperation of multiple sets of stamping and riveting fixtures on the same machine. During processing, the feeding device corresponding to the three stamping fixtures conveys the material strip towards the corresponding processing hole, and then the stamping fixture punches the single workpiece into the processing hole, and then the rotary table rotates. After the rotary table rotates through the circumference corresponding to the three processing holes, a specified number of workpieces are punched in the processing hole close to the riveting fixture along the rotation direction. The workpiece is then rotated by the rotary table to the underside of the riveting fixture, where it is riveted and squeezed out of the dropping hole of the fixed table. Compared with the traditional process of punching a single strip and collecting the workpiece for re-riveting, this design keeps the punched workpiece in the processing hole, and the stacked workpieces after multiple punches will not shift under the limit of the processing hole, which facilitates the subsequent riveting positioning.

[0068] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An automatic rotary stamping and riveting die, characterized in that, The system includes a rotary table, stamping fixtures, riveting fixtures, and a feeding device. The rotary table comprises a rotating platform and a fixed platform, with the rotating platform rotatably mounted on the fixed platform. Three stamping fixtures and one riveting fixture are provided. The stamping and riveting fixtures are spaced apart circumferentially along the rotating platform. Processing holes are provided on the rotating platform corresponding to the stamping and riveting fixtures. A material discharge hole is provided on the fixed platform corresponding to the riveting fixture. The feeding device is arranged corresponding to the stamping and riveting fixtures. It also includes a material clamping device, which comprises a material clamping base and a material clamping block; a movable cavity communicating with the lower side of the machining hole is provided on the rotating platform, and the material clamping base is movable along the height direction of the movable cavity; a spring is provided between the lower side of the material clamping base and the movable cavity; a first mounting groove is provided on the inner walls of both sides of the machining hole, and the material clamping block is rotatably disposed in the first mounting groove; a torsion spring is provided on the material clamping block; one end of the material clamping block protrudes from the inner wall of the machining hole; the straight-line distance from the rotation center of the material clamping block to its protruding end is greater than its distance to the upper inner wall of the first mounting groove, but less than its distance to the lower inner wall of the first mounting groove; It also includes a third driving device. The inner walls of both sides of the moving cavity are provided with second mounting grooves, and the third driving device is installed in the second mounting grooves. The clamping seat includes a clamping housing, a blanking plate, a first connecting rod, and a moving plate. Two blanking plates are provided on the upper side of the clamping housing, and the two blanking plates are respectively hinged to the two sides of the clamping housing. The blanking plates are rotatable towards the inner side of the clamping housing. The moving plate is located on the side of the clamping housing opposite to the inner walls of the moving cavity. The moving plate is movable towards the inner wall of the adjacent moving cavity, and the moving plate is hinged to the adjacent blanking plate via the first connecting rod. The side of the moving plate near the inner wall of the moving cavity is detachably connected to the driving end of the third driving device. The lower side of the clamping housing has a hollowed-out portion for workpiece ejection.

2. The automatic rotary stamping and riveting die according to claim 1, characterized in that, The stamping fixture includes a punch, a first driving device, and a second driving device. The first driving device is connected to the punch and drives it to move toward the machining hole. A pressure block is provided in the middle of the punch, and the second driving device is connected to the pressure block and drives it to move along the height direction of the punch.

3. The automatic rotary stamping and riveting die according to claim 1, characterized in that, The movable plate is provided with a first hook protruding from the side of the material housing, and the first hook is bent downwards; the inner wall of the movable cavity is provided with a clearance groove along its height direction corresponding to the first hook; the driving end of the third driving device is provided with a second hook, the second hook is located in the clearance groove and the second hook is bent upwards; the first hook and the second hook cooperate.

4. The automatic rotary stamping and riveting die according to claim 1, characterized in that, It also includes a pressing device, which comprises a movable base, a second connecting rod, and a drive gear; a third mounting groove is provided on the inner walls of both sides of the movable cavity, the third mounting groove being located above the second mounting groove; the drive gear is rotatably mounted in the third mounting groove; the clamping base also includes a rotating shaft, the rotating shaft being located at the upper edges of both sides of the clamping housing, the material dropping plate being connected to the rotating shaft, and the rotating shaft being hinged to the clamping housing; an incomplete gear is provided on the rotating shaft; the incomplete gear cooperates with the drive gear; one end of the second connecting rod is eccentrically connected to the drive gear, and the other end is connected to the movable base; the clamping block is mounted on the movable base, and the movable base is movable along the height direction of the first mounting groove.

5. The automatic rotary stamping and riveting die according to claim 4, characterized in that, The clamping block is L-shaped, and its two ends abut against the upper end face and side face of the workpiece inside the machining hole, respectively.

6. The automatic rotary stamping and riveting die according to claim 4, characterized in that, The pressing device also includes a limiting fork, which is disposed in the third mounting groove. The fork head is engaged with the part of the second connecting rod and the drive gear. The end of the limiting fork away from the fork head is connected to the inner wall of the third mounting groove by a spring. A transmission rod is provided on the lower side of the limiting fork. The second mounting groove is provided with a moving hole along its length direction. The moving hole communicates with the third mounting groove. The transmission rod extends through the moving hole into the second mounting groove. The projection of the moving plate in the length direction of the second mounting groove coincides with the transmission rod.

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