CN115007746A

CN115007746A - Stamping die and stamping method for automobile connecting plate

Info

Publication number: CN115007746A
Application number: CN202210654060.XA
Authority: CN
Inventors: 陈星�
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-09-06

Abstract

The invention relates to a stamping die for an automobile connecting plate, which comprises a base, wherein a fixed plate is fixedly connected with the rear end of the top of the base, the front end of the fixed plate penetrates through and is rotatably connected with a connecting shaft, a stamping die is fixedly connected with the front end of the connecting shaft, stamping grooves are formed in the top and two sides of the stamping die, a gear ring is fixedly sleeved at the rear end of the connecting shaft, a stamping mechanism is arranged on the base, the stamping mechanism is connected with an adjusting plate, two symmetrically-distributed adjusting grooves are formed in the bottom of the adjusting plate, adjusting blocks are slidably connected in the adjusting grooves, first racks are fixedly connected with the bottom of each adjusting block, the two first racks are symmetrically distributed on two sides of the gear ring, an adjusting screw is rotatably connected between the two adjusting grooves, the adjusting screw is in threaded connection with the adjusting block, a motor is fixedly connected to one side of the adjusting plate, and an output shaft of the motor is fixedly connected with the adjusting screw; the invention realizes the switching of the stamping grooves by utilizing the rotation of the stamping die, thereby being capable of carrying out stamping processing of three different shapes.

Description

Stamping die and stamping method for automobile connecting plate

Technical Field

The invention relates to the technical field of stamping dies, in particular to a stamping die for an automobile connecting plate.

Background

The stamping die is a special process equipment for processing materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping processing, and is called a cold stamping die (commonly called a cold stamping die). Stamping is a press working method in which a die mounted on a press is used to apply pressure to a material at room temperature to cause separation or plastic deformation of the material, thereby obtaining a desired part.

When the automobile connecting plate is machined, stamping forming needs to be carried out through a stamping die, but when the existing stamping device works, the stamping forming processing of one shape can be carried out on the connecting plate generally, and for the stamping processing of different shapes, a plurality of stamping devices need to be equipped, so that the cost is increased, and the stamping die for the automobile connecting plate is provided to solve the problems.

In order to solve the problems, the invention provides a stamping die for an automobile connecting plate.

Disclosure of Invention

The invention aims to overcome the problem that the existing stamping die can only be used for stamping and forming one shape, and provides a stamping die for an automobile connecting plate to solve the technical problem.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

the utility model provides a stamping die for automobile connection board, the on-line screen storage device comprises a base, base top rear end fixedly connected with fixed plate, the fixed plate front end runs through and the swivelling joint has the connecting axle, connecting axle front end fixedly connected with die, the punching press groove has all been seted up to die top and both sides, three punching press groove shape is different, connecting axle rear end cover is established and is fixed with the ring gear, be provided with punching press mechanism on the base, punching press mechanism is connected with the regulating plate, two symmetric distribution's adjustment tank is seted up to the regulating plate bottom, sliding connection has the regulating block in the adjustment tank, the first rack of regulating block bottom fixedly connected with, two first rack symmetric distribution are in the both sides of ring gear, it is connected with same adjusting screw to rotate between two adjustment tanks, adjusting screw and regulating block threaded connection, regulating plate one side fixedly connected with motor, fixed connection between motor output shaft and the adjusting screw.

Preferably, punching press mechanism includes the roof, base rear end fixedly connected with support frame, roof fixed connection in the top of support frame, roof bottom fixedly connected with pneumatic cylinder, pneumatic cylinder output shaft has the mount pad, mount pad bottom fixedly connected with punching press head, mount pad rear end fixedly connected with link, fixed connection between link and the regulating plate.

Preferably, the top and two sides of the punching die are fixedly connected with first positioning plates, and the first positioning plates are positioned on the side edges of the punching groove.

Preferably, one side fixedly connected with backup pad of first locating plate is kept away from at the base top, and backup pad front end fixedly connected with deflector, the guide way has been seted up at the deflector top, and sliding connection has the guide block in the guide way, and guide block top fixedly connected with second locating plate, second locating plate cross-section set to L shape, and the guide way internal rotation is connected with first screw rod, first screw rod and guide block threaded connection, first screw rod are connected with drive mechanism.

Preferably, the transmission mechanism comprises a second rack, the second rack is fixedly connected to one side of the mounting base close to the guide plate, one side of the first screw close to the second rack extends to the outside of the guide plate and is fixedly connected with a gear, and the gear is meshed with the second rack.

Preferably, the front end of the fixing plate is fixedly connected with two guide plates which are symmetrically distributed on two sides, the guide plates incline downwards from the middle to one side, the stopping part is arranged on the outer side of the top of each guide plate, and the stopping part is perpendicular to the guide plates.

Preferably, base top front end fixedly connected with montant, montant top fixedly connected with feeding platform, feeding platform top both sides all are provided with the flange of a body structure, and two flanges are the splayed and distribute.

Preferably, base top fixedly connected with loop bar, loop bar bottom inner wall fixedly connected with reset spring, pole in the fixedly connected with of reset spring top, interior pole top fixedly connected with kicking block, kicking block top surface are the cambered surface, and the die bottom has been seted up and has been docked the groove, and the butt joint groove cross-section sets to the arc, and interior pole is connected with stop gear.

Preferably, stop gear includes the stopper, and the spacing groove has been seted up to loop bar rear end inner wall, stopper sliding connection in spacing inslot, fixed connection between stopper and the interior pole.

Has the advantages that:

1. the connecting plate is placed on a stamping die, a hydraulic cylinder is started, a hydraulic cylinder output shaft drives a mounting seat and a stamping head to move downwards to stamp the connecting plate in one shape, when different shapes need to be stamped, a motor is started firstly, the motor output shaft drives an adjusting screw rod to rotate, under the action of threads, an adjusting block is enabled to move along an adjusting groove, then a first rack is synchronously driven to move until a corresponding first rack and a corresponding gear ring form meshing, then the hydraulic cylinder is started, the hydraulic cylinder output shaft drives the mounting seat and the stamping head to move downwards, when the mounting seat moves downwards, the whole of a connecting frame and the first rack is synchronously driven to move downwards, the first rack meshes to drive the gear ring to rotate, then a connecting shaft and the stamping die are synchronously driven to rotate, after the stamping die rotates for 90 degrees, the first rack and the gear ring are disengaged, and at the moment, the switching of the stamping grooves in different shapes can be realized, then the connecting plate is placed on the punching die, the punching head continues to move downwards, and the connecting plate can be punched, so that punching processing of three different shapes can be performed through the device, and the cost is reduced.

2. Be provided with the second rack, when the mount pad lapse, the synchronous drive second rack lapse, second rack meshing drives the gear and rotates, then the synchronous drive first screw rod rotates, under the screw thread effect, make the guide block move left along the guide way, then the synchronous drive second locating plate moves left, can fix the connecting plate from both sides through first locating plate and second locating plate, when the connecting plate was fixed, second rack and gear just break away from the meshing, then the punching press head continues the lapse, carry out the punching press to the connecting plate.

3. Be provided with the stock guide, when the punching press groove that needs to use the die both sides carries out the punching press, first rack and ring gear are in the engaged state, and after the punching press finishes, the pneumatic cylinder output shaft drives the punching press head and resets, and first rack meshing can drive ring gear antiport, can make the die synchronous rotation, and when the die slope, the connecting plate can fall on the stock guide along the die to through hindering stopping the stopping of portion, realize the automatic discharging to the connecting plate.

4. Be provided with the kicking block, can be when the punching press groove at use die top carries out the punching press, under the reset spring effect, make the kicking block with dock the groove butt joint, the counterpunch mould supports, thereby effectively keep the die to be located the horizontality, prevent the die slope, because the kicking block top is the arc, can not hinder the rotation of die, when the punching press groove that uses the die both sides carries out the punching press, the kicking block can push up in the punching press groove that corresponds, it is located the horizontality to keep the die, thereby make the process of placeeing of connecting plate more stable convenient.

Drawings

FIG. 1 is a schematic overall structure diagram of a stamping die for an automobile connecting plate according to the present invention;

FIG. 2 is a schematic view of a first rack mounting structure of a stamping die for an automobile connecting plate according to the present invention;

FIG. 3 is a schematic view of a bottom structure of a stamping die of the stamping die for the automobile connecting plate according to the invention;

FIG. 4 is an enlarged schematic structural view of the stamping die for the automobile connecting plate at the position A of the invention;

FIG. 5 is a schematic structural view of a feeding table of a stamping die for an automobile connecting plate according to the present invention;

fig. 6 is a schematic diagram of an internal structure of a loop bar of a stamping die for an automobile connecting plate according to the invention.

The reference numbers are as follows:

1. a base; 2. a fixing plate; 3. a connecting shaft; 4. punching a die; 5. punching a groove; 6. a ring gear; 7. an adjusting plate; 8. an adjustment groove; 9. an adjusting block; 10. a first rack; 11. adjusting the screw rod; 12. a motor; 13. a top plate; 14. a hydraulic cylinder; 15. a mounting seat; 16. punching a head; 17. a connecting frame; 18. a first positioning plate; 19. a support plate; 20. a guide plate; 21. a guide groove; 22. a guide block; 23. a second positioning plate; 24. a first screw; 25. a gear; 26. a second rack; 27. a material guide plate; 28. a stopping part; 29. a vertical rod; 30. a feeding table; 31. blocking edges; 32. a loop bar; 33. an inner rod; 34. a top block; 35. a butt joint groove; 36. a return spring; 37. a limiting groove; 38. and a limiting block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The invention will be further illustrated with reference to the following figures 1-6 and examples:

in the embodiment, as shown in fig. 1-5, a stamping die for an automobile connecting plate comprises a base 1, a fixed plate 2 is fixedly connected to the rear end of the top of the base 1, a connecting shaft 3 is connected to the front end of the fixed plate 2 in a penetrating manner, a stamping die 4 is fixedly connected to the front end of the connecting shaft 3, stamping grooves 5 are formed in the top and two sides of the stamping die 4, the three stamping grooves 5 are different in shape, a gear ring 6 is fixedly sleeved on the rear end of the connecting shaft 3, a stamping mechanism is arranged on the base 1 and is connected with an adjusting plate 7, two symmetrically distributed adjusting grooves 8 are formed in the bottom of the adjusting plate 7, an adjusting block 9 is slidably connected in the adjusting grooves 8, first racks 10 are fixedly connected to the bottom of the adjusting block 9, the two first racks 10 are symmetrically distributed on two sides of the gear ring 6, the same adjusting screw 11 is rotatably connected between the two adjusting grooves 8, and the adjusting screw 11 is in threaded connection with the adjusting block 9, one side of the adjusting plate 7 is fixedly connected with a motor 12, and an output shaft of the motor 12 is fixedly connected with the adjusting screw rod 11.

Further, punching press mechanism includes

roof

13, and 1 rear end fixedly connected with support frame of base, roof 13 fixed connection in the top of support frame, 13 bottom fixedly connected with pneumatic cylinders 14 of roof, 14 output shaft of pneumatic cylinders have

mount pad

15, 15 bottom fixedly connected with punching press heads 16 of mount pad, 15 rear end fixedly connected with link 17 of mount pad, fixed connection between link 17 and the regulating plate 7, can carry out the punching press operation.

Further, the top and the both sides of the die 4 are fixedly connected with a first positioning plate 18, and the first positioning plate 18 is positioned on the side edge of the stamping groove 5, so that the connecting plate can be limited from the side edge.

Further, one side fixedly connected with backup pad 19 of first locating plate 18 is kept away from at base 1 top, 19 front end fixedly connected with deflector 20 of backup pad, guide way 21 has been seted up at deflector 20 top, sliding connection has guide block 22 in the guide way 21, guide block 22 top fixedly connected with second locating plate 23, the L shape is set to second locating plate 23 cross-section, 21 internal rotation of guide way are connected with first screw rod 24, first screw rod 24 and guide block 22 threaded connection, first screw rod 24 is connected with drive mechanism, can fix the connecting plate.

Further, the transmission mechanism includes a second rack 26, the second rack 26 is fixedly connected to one side of the mounting seat 15 close to the guide plate 20, one side of the first screw 24 close to the second rack 26 extends to the outside of the guide plate 20 and is fixedly connected with a gear 25, and the gear 25 is meshed with the second rack 26, that is, the gear 25 can be driven to rotate by the second rack 26.

Furthermore, two guide plates 27 symmetrically distributed on two sides are fixedly connected to the front end of the fixing plate 2, the guide plates 27 incline downwards from the middle to one side, a stopping part 28 is arranged on the outer side of the top of the guide plates 27, and the stopping part 28 and the guide plates 27 are perpendicular to each other, so that the connecting plate can be supported.

Further, base 1 top front end fixedly connected with montant 29, montant 29 top fixedly connected with feed table 30, feed table 30 top both sides all are provided with flange 31 of a body structure, and two flanges 31 are the splayed and distribute, can be convenient for realize the accurate feeding of connecting plate.

In this embodiment, referring to fig. 3 and 6, the top of the base 1 is fixedly connected with a loop bar 32, the inner wall of the bottom of the loop bar 32 is fixedly connected with a return spring 36, the top of the return spring 36 is fixedly connected with an inner rod 33, the top of the inner rod 33 is fixedly connected with a top block 34, the top surface of the top block 34 is an arc surface, the bottom of the stamping die 4 is provided with a butt joint groove 35, the cross section of the butt joint groove 35 is set to be arc-shaped, the inner rod 33 is connected with a limiting mechanism, and the balance of the stamping die 4 can be maintained.

Further, the limiting mechanism comprises a limiting block 38, a limiting groove 37 is formed in the inner wall of the rear end of the loop bar 32, the limiting block 38 is connected to the limiting groove 37 in a sliding mode, the limiting block 38 is fixedly connected with the inner rod 33, and the inner rod 33 can be limited and moved.

The connecting plate is placed on a die 4, a hydraulic cylinder 14 is started, an output shaft of the hydraulic cylinder 14 drives a mounting seat 15 and a stamping head 16 to move downwards to stamp one shape of the connecting plate, when different shapes need to be stamped, a motor 12 is started first, an output shaft of the motor 12 drives an adjusting screw rod 11 to rotate, under the action of threads, an adjusting block 9 moves along an adjusting groove 8, then a first rack 10 is synchronously driven to move until the corresponding first rack 10 and a gear ring 6 form meshing, then the hydraulic cylinder 14 is started, an output shaft of the hydraulic cylinder 14 drives the mounting seat 15 and the stamping head 16 to move downwards, when the mounting seat 15 moves downwards, the whole of a connecting frame 17 and the first rack 10 is synchronously driven to move downwards, the first rack 10 meshes to drive the gear ring 6 to rotate, then the connecting shaft 3 and the die 4 are synchronously driven to rotate, and the first rack 10 and the gear ring 6 are disengaged until the die 4 rotates 90 degrees, can realize the switching of different shapes stamping groove 5 this moment, put the connecting plate on die 4 then, the punching press head 16 continues to move down, can carry out the punching press to the connecting plate to the accessible device carries out the punching press processing of three kinds of different shapes, reduce cost.

Further, be provided with second rack 26, when mount pad 15 moves down, it moves down to drive second rack 26 in step, second rack 26 meshes and drives gear 25 and rotate, then drive first screw rod 24 in step and rotate, under the screw thread effect, make guide block 22 move left along guide way 21, then drive second locating plate 23 and move left in step, can fix the connecting plate from both sides through first locating plate 18 and second locating plate 23, when the connecting plate is fixed, second rack 26 and gear 25 just break away from the meshing, and back punching head 16 continues to move down, carry out the punching press to the connecting plate.

Further, a material guide plate 27 is arranged, when the stamping grooves 5 on two sides of the stamping die 4 are required to be used for stamping, the first rack 10 and the gear ring 6 are in a meshed state, after the stamping is finished, the output shaft of the hydraulic cylinder 14 drives the stamping head 16 to reset, the gear ring 6 is driven to rotate reversely by meshing of the first rack 10, the stamping die 4 can rotate synchronously, when the stamping die 4 inclines, the connecting plate can fall onto the material guide plate 27 along the stamping die 4, and the automatic discharging of the connecting plate is realized through blocking of the blocking part 28.

Further, be provided with kicking block 34, can be when using stamping groove 5 at die 4 top to punch, under reset spring 36 effect, make kicking block 34 and butt joint groove 35 butt joint, support stamping die 4, thereby effectively keep die 4 to be located the horizontality, prevent die 4 slope, because kicking block 34 top is the arc, can not hinder the rotation of die 4, when using stamping groove 5 of die 4 both sides to punch, kicking block 34 can push up in the stamping groove 5 that corresponds, it is located the horizontality to keep die 4, thereby make the process of putting of connecting plate more stable convenient.

The working principle is as follows: when the punching die is used, a connecting plate is placed on the punching die 4, the hydraulic cylinder 14 is started, the output shaft of the hydraulic cylinder 14 drives the mounting seat 15 and the punching head 16 to move downwards to punch a shape of the connecting plate, when different shapes need to be punched, the motor 12 is started first, the output shaft of the motor 12 drives the adjusting screw rod 11 to rotate, under the action of threads, the adjusting block 9 moves along the adjusting groove 8, then the first rack 10 is synchronously driven to move until the corresponding first rack 10 and the gear ring 6 are meshed, then the hydraulic cylinder 14 is started, the output shaft of the hydraulic cylinder 14 drives the mounting seat 15 and the punching head 16 to move downwards, when the mounting seat 15 moves downwards, the whole of the connecting frame 17 and the first rack 10 is synchronously driven to move downwards, the first rack 10 is meshed to drive the gear ring 6 to rotate, then the connecting shaft 3 and the punching die 4 are synchronously driven to rotate until the punching die 4 rotates by 90 degrees, the first rack 10 and the gear ring 6 are disengaged, at the moment, the switching of stamping grooves 5 in different shapes can be realized, then the connecting plate is placed on the stamping die 4, the stamping head 16 continues to move downwards, and the connecting plate can be stamped, so that the device can be used for stamping three different shapes, and the cost is reduced; further, a second rack 26 is arranged, when the mounting base 15 moves downwards, the second rack 26 is synchronously driven to move downwards, the second rack 26 is meshed with the driving gear 25 to rotate, then the first screw 24 is synchronously driven to rotate, under the action of threads, the guide block 22 moves leftwards along the guide groove 21, then the second positioning plate 23 is synchronously driven to move leftwards, the connecting plate can be fixed from two sides through the first positioning plate 18 and the second positioning plate 23, when the connecting plate is fixed, the second rack 26 and the gear 25 are just disengaged, and the rear punching head 16 continues to move downwards to punch the connecting plate; furthermore, a material guide plate 27 is arranged, when the stamping grooves 5 on the two sides of the stamping die 4 are required to be used for stamping, the first rack 10 and the gear ring 6 are in an engaged state, after the stamping is finished, the output shaft of the hydraulic cylinder 14 drives the stamping head 16 to reset, the gear ring 6 is driven to rotate in the reverse direction by the engagement of the first rack 10, so that the stamping die 4 can rotate synchronously, when the stamping die 4 inclines, the connecting plate can fall onto the material guide plate 27 along the stamping die 4, and the automatic discharging of the connecting plate is realized through the blocking of the blocking part 28; further, be provided with kicking block 34, can be when using stamping groove 5 at die 4 top to punch, under reset spring 36 effect, make kicking block 34 and butt joint groove 35 butt joint, support stamping die 4, thereby effectively keep die 4 to be located the horizontality, prevent die 4 slope, because kicking block 34 top is the arc, can not hinder the rotation of die 4, when using stamping groove 5 of die 4 both sides to punch, kicking block 34 can push up in the stamping groove 5 that corresponds, it is located the horizontality to keep die 4, thereby make the process of putting of connecting plate more stable convenient.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.

Claims

1. A stamping die for an automobile connecting plate comprises a base (1) and is characterized in that a fixing plate (2) is fixedly connected to the rear end of the top of the base (1), a connecting shaft (3) is connected to the front end of the fixing plate (2) in a penetrating and rotating mode, a stamping die (4) is fixedly connected to the front end of the connecting shaft (3), stamping grooves (5) are formed in the top and two sides of the stamping die (4), the three stamping grooves (5) are different in shape, a gear ring (6) is fixedly sleeved on the rear end of the connecting shaft (3), a stamping mechanism is arranged on the base (1), the stamping mechanism is connected with a regulating plate (7), two regulating grooves (8) which are symmetrically distributed are formed in the bottom of the regulating plate (7), regulating blocks (9) are connected in the regulating grooves (8) in a sliding mode, first racks (10) are fixedly connected to the bottoms of the regulating blocks (9), and the two first racks (10) are symmetrically distributed on two sides of the gear ring (6), the same adjusting screw (11) is rotatably connected between the two adjusting grooves (8), the adjusting screw (11) is in threaded connection with the adjusting block (9), a motor (12) is fixedly connected to one side of the adjusting plate (7), and an output shaft of the motor (12) is fixedly connected with the adjusting screw (11).

2. A press die for automotive connector plates, as claimed in claim 1, wherein: punching press mechanism includes roof (13), base (1) rear end fixedly connected with support frame, roof (13) fixed connection in the top of support frame, roof (13) bottom fixedly connected with pneumatic cylinder (14), pneumatic cylinder (14) output shaft has mount pad (15), mount pad (15) bottom fixedly connected with punching press head (16), mount pad (15) rear end fixedly connected with link (17), fixed connection between link (17) and regulating plate (7).

3. The stamping die for an automobile connecting plate as claimed in claim 1, wherein: the top and two sides of the stamping die (4) are fixedly connected with first positioning plates (18), and the first positioning plates (18) are located on the side edges of the stamping groove (5).

4. A press die for automotive connector plates, according to claim 3, characterized in that: one side fixedly connected with backup pad (19) of first locating plate (18) is kept away from at base (1) top, backup pad (19) front end fixedly connected with deflector (20), guide way (21) have been seted up at deflector (20) top, sliding connection has guide block (22) in guide way (21), guide block (22) top fixedly connected with second locating plate (23), second locating plate (23) cross-section sets up L shape, guide way (21) internal rotation is connected with first screw rod (24), first screw rod (24) and guide block (22) threaded connection, first screw rod (24) are connected with drive mechanism.

5. The stamping die for an automobile connecting plate as claimed in claim 4, wherein: the transmission mechanism comprises a second rack (26), the second rack (26) is fixedly connected to one side, close to the guide plate (20), of the mounting seat (15), one side, close to the second rack (26), of the first screw (24) extends to the outer portion of the guide plate (20) and is fixedly connected with a gear (25), and the gear (25) is meshed with the second rack (26).

6. The stamping die for an automobile connecting plate as claimed in claim 1, wherein: the front end of the fixing plate (2) is fixedly connected with two guide plates (27) which are symmetrically distributed on two sides, the guide plates (27) incline downwards from the middle to one side, the outer side of the top of each guide plate (27) is provided with a stopping part (28), and the stopping parts (28) are perpendicular to the guide plates (27).

7. The stamping die for an automobile connecting plate as claimed in claim 1, wherein: the base (1) top front end fixedly connected with montant (29), montant (29) top fixedly connected with feeding platform (30), feeding platform (30) top both sides all are provided with flange (31) of an organic whole structure, and two flange (31) are the splayed and distribute.

8. The stamping die for an automobile connecting plate as claimed in claim 1, wherein: base (1) top fixedly connected with loop bar (32), loop bar (32) bottom inner wall fixedly connected with reset spring (36), pole (33) in reset spring (36) top fixedly connected with, pole (33) top fixedly connected with kicking block (34), kicking block (34) top surface is the cambered surface, and butt joint groove (35) have been seted up to die (4) bottom, and butt joint groove (35) cross-section sets to the arc, and interior pole (33) are connected with stop gear.

9. The stamping die for an automobile connecting plate as claimed in claim 8, wherein: the limiting mechanism comprises a limiting block (38), a limiting groove (37) is formed in the inner wall of the rear end of the loop bar (32), the limiting block (38) is connected in the limiting groove (37) in a sliding mode, and the limiting block (38) is fixedly connected with the inner bar (33).

10. A working method of a press die for automobile connection plates according to any one of claims 1 to 9, characterized in that: the connecting plate is placed on a punching die (4), a hydraulic cylinder (14) is started, an output shaft of the hydraulic cylinder (14) drives a mounting seat (15) and a punching head (16) to move downwards to punch the connecting plate into a shape, when different shapes need to be punched, a motor (12) is started first, an output shaft of the motor (12) drives an adjusting screw rod (11) to rotate, under the action of threads, an adjusting block (9) moves along an adjusting groove (8), then a first rack (10) is synchronously driven to move until the corresponding first rack (10) and a gear ring (6) form meshing, then the hydraulic cylinder (14) is started, an output shaft of the hydraulic cylinder (14) drives the mounting seat (15) and the punching head (16) to move downwards, when the mounting seat (15) moves downwards, a connecting frame (17) and the first rack (10) are synchronously driven to integrally move downwards, the first rack (10) meshes to drive the gear ring (6) to rotate, then synchronously driving the connecting shaft (3) and the punching die (4) to rotate until the punching die (4) rotates for 90 degrees, the first rack (10) and the gear ring (6) are disengaged, at the moment, the switching of punching grooves (5) with different shapes can be realized, then the connecting plate is placed on the punching die (4), and the punching head (16) continues to move downwards, so that the connecting plate can be punched, and the device can be used for punching three different shapes, thereby reducing the cost; further, a second rack (26) is arranged, when the mounting base (15) moves downwards, the second rack (26) is synchronously driven to move downwards, the second rack (26) is meshed with the driving gear (25) to rotate, then the first screw (24) is synchronously driven to rotate, under the action of threads, the guide block (22) moves leftwards along the guide groove (21), then the second positioning plate (23) is synchronously driven to move leftwards, namely the connecting plate can be fixed from two sides through the first positioning plate (18) and the second positioning plate (23), when the connecting plate is fixed, the second rack (26) and the gear (25) are just disengaged, and the rear punching head (16) continues to move downwards to punch the connecting plate; furthermore, a material guide plate (27) is arranged, when stamping grooves (5) on two sides of the stamping die (4) are required to be used for stamping, the first rack (10) and the gear ring (6) are in an engaged state, after the stamping is finished, an output shaft of the hydraulic cylinder (14) drives the stamping head (16) to reset, the first rack (10) is engaged to drive the gear ring (6) to rotate reversely, the stamping die (4) can rotate synchronously, when the stamping die (4) inclines, the connecting plate can fall onto the material guide plate (27) along the stamping die (4), and the automatic discharging of the connecting plate is realized through the blocking of the blocking part (28); further, be provided with kicking block (34), can be when using stamping groove (5) at die (4) top to punch, under reset spring (36) effect, make kicking block (34) and butt joint groove (35) butt joint, support die (4), thereby effectively keep die (4) to be located the horizontality, prevent die (4) slope, because kicking block (34) top is the arc, can not hinder the rotation of die (4), when using stamping groove (5) of die (4) both sides to punch, kicking block (34) can push up in stamping groove (5) that correspond, keep die (4) to be located the horizontality, thereby make the process of placeeing of connecting plate more stable convenient.