CN110883211A

CN110883211A - Sheet metal stamping die

Info

Publication number: CN110883211A
Application number: CN201911305665.2A
Authority: CN
Inventors: 郑六军
Original assignee: 郑六军
Current assignee: Taicang Huamao metal products Co., Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-03-17
Anticipated expiration: 2039-12-18
Also published as: CN110883211B

Abstract

The invention discloses a sheet metal stamping die, which comprises a supporting plate, a movable die plate, a lower die and an upper die unit, and is characterized in that: be provided with first punching press jar and second punching press jar in the backup pad, it includes first last mould, mould and third on the second to go up the mould unit, first last mould sets up in the output of first punching press jar, the movable mould board sets up on the output of second punching press jar, mould and third on the second go up the mould and set up side by side in the below of movable mould board, first punching press groove has been seted up on first last mould, the second punching press groove has been seted up on the mould lateral wall on the second, set up transversely arranged's mounting groove and vertical arrangement's sliding tray on the lower mould, it is provided with horizontal slider to slide in the mounting groove, be provided with horizontal drift on the horizontal slider, it is provided with perpendicular slider to slide in the sliding tray, be provided with perpendicular drift on the perpendicular slider, it contacts through the inclined plane to. The invention provides a sheet metal stamping die which can simultaneously realize bending and multidirectional punching processing of a sheet metal in a one-time stamping process.

Description

Sheet metal stamping die

Technical Field

The invention relates to the field of stamping, in particular to a sheet metal stamping die.

Background

The metal plate has the characteristics of light weight, high strength, conductivity (capable of being used for electromagnetic shielding), low cost, good large-scale mass production performance and the like, and is widely applied to the fields of electronic appliances, communication, automobile industry, medical appliances and the like, for example, in computer cases, mobile phones and MP3, the metal plate is an essential component. The sheet metal is a comprehensive cold working process for sheet metal (generally below 6 mm), including shearing, punching/cutting/compounding, folding, riveting, splicing, forming (such as automobile bodies) and the like, and the sheet metal is characterized in that the thickness of the same part is consistent.

The existing sheet metal stamping die generally only aims at one stamping process of a workpiece by one die. For example, the present chinese utility model with publication number CN201524742U discloses "an anti-skip scrap metal plate stamping die", which is composed of a frame and an upper die set and a lower die set vertically separable from each other on the frame, the upper die set and the lower die set comprise a die holder, a backing plate and a die plate, a top fixing thimble is arranged in the upper die set, the thimble is composed of a needle head and a pressure spring, the needle head of the thimble extends out of the upper die set die plate, and the stroke of the pressure spring is smaller than the stroke of the vertical separation of the upper die set and the lower die set. The utility model discloses a panel beating stamping die to can only be to the vertical processing of once punching a hole that carries on of work piece.

For another example, chinese utility model publication No. CN209502733U discloses "a metal plate-working bending die", which includes a lower die holder, a first lower die assembly disposed on one side of an upper end surface of the lower die holder, a second lower die assembly disposed on the opposite end of the upper end surface of the lower die holder and corresponding to the first lower die assembly, a plurality of vertical bars vertically disposed on the lower die holder, an upper die holder movably connected to the vertical bars, and an upper die disposed on a bottom surface of the lower die holder; the first lower die assembly and the second lower die assembly are symmetrically arranged; the first lower die assembly and the second lower die assembly have the same structure and respectively comprise a supporting fixing piece arranged on the lower die holder, a connecting rod horizontally connected to the supporting fixing piece and a lower die detachably connected to the end part of the connecting rod; the connecting rod is arranged in parallel with the lower die holder; the lower die is provided with an inner concave part used for connecting the connecting rod, and the end part of the connecting rod is provided with a connecting block corresponding to the inner concave part. And the utility model discloses a panel beating stamping die to can only buckle processing to the work piece.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art, and provides a sheet metal stamping die which can simultaneously realize bending and multidirectional punching processing of a sheet metal in a one-time stamping process.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a panel beating stamping die, includes backup pad, movable mould board, lower mould and goes up the die unit, its characterized in that: the supporting plate is provided with a first stamping cylinder and a second stamping cylinder, the upper die unit comprises a first upper die, a second upper die and a third upper die, the first upper die is arranged at the output end of the first stamping cylinder, the movable die plate is arranged on the output end of the second stamping cylinder, the second upper die and the third upper die are arranged below the movable die plate in parallel, the lower die is arranged under the second upper die, the first upper die descends along the side wall of the lower die in the movement process, a first stamping groove is formed in the side wall of the first upper die opposite to the lower die, a first discharging hole communicated with the first stamping groove is formed in the first upper die, the first discharging hole is connected with a first material suction pump, a second stamping groove is formed in the side wall of the second upper die opposite to the lower die, a second discharging hole communicated with the second stamping groove is formed in the second upper die, and the second discharging hole is connected with a second material suction pump, a cutting cylinder is arranged on the movable template between the second upper die and the third upper die, the output end of the cutting cylinder is provided with a cutting knife, a cutting groove is arranged on the lower die corresponding to the cutting knife, the bottom of the lower die is provided with an installation groove, a transverse sliding block is transversely arranged in the installation groove in a sliding manner, a transverse punch head which penetrates through the side wall of the lower die and is matched with the first punching groove in shape is arranged on the transverse sliding block, a sliding groove which is vertically arranged and is communicated with the installation groove is arranged on the lower die, a vertical sliding block is arranged in the sliding groove in a sliding manner, a vertical punch head which penetrates through the upper surface of the lower die and is matched with the second punching groove in shape is arranged on the vertical sliding block, a compression spring which is abutted against the vertical sliding block is arranged at the bottom of the sliding groove, inclined planes are respectively formed on the opposite side surfaces of the vertical sliding block and the transverse sliding block, a connecting rod is hinged between the crank and the transverse sliding block, and the transverse sliding block pushes the vertical sliding block to slide in the sliding groove in the sliding process of the transverse sliding block in the mounting groove.

As the improvement, the outside of lower mould is located and is provided with a discharge cylinder with the relative department of horizontal slider, and discharge cylinder's output is provided with an electro-magnet, and after the panel beating punching press was accomplished, cut off between the sheet metal component after the completion and the sheet metal, at this moment, discharge cylinder piston rod stretches out, and the electro-magnet is electrified, and the sheet metal component after the completion is adsorbed on the electro-magnet, later, discharge cylinder resets, and the electro-magnet withdraws from the back and loses the electricity, and the sheet metal component after the completion drops to in the discharge box.

And the intermittent feeding mechanism comprises a toothed belt, a smooth belt wheel used for tensioning the toothed belt and a toothed surface belt wheel meshed with the toothed belt, a grooved wheel is arranged on a central shaft of the toothed surface belt wheel and is in transmission connection with a driving plate, a plurality of cambered surfaces are uniformly distributed in the circumferential direction of the grooved wheel, a strip-shaped groove is formed between every two adjacent cambered surfaces, the driving plate comprises a plate body matched with the cambered surfaces in radian, a driving lever is arranged on the plate body, a cylindrical pin used for being inserted into the strip-shaped groove is arranged on the driving lever, and a rotating shaft of the driving plate is connected with the output end of a feeding motor. In the feeding process of the intermittent feeding mechanism, the feeding motor rotates, the feeding motor drives the driving plate to rotate, when a cylindrical pin on the driving plate is inserted into a strip-shaped groove on the grooved wheel, the driving plate drives the grooved wheel to synchronously rotate, the tooth surface belt wheel rotates to drive the toothed belt to move, the toothed belt drives the plate to move forwards for a distance, and when the plate is in rest, the grooved wheel keeps static, the plate keeps static on the toothed belt, so that the plate at the front end can be conveniently subjected to sheet metal processing.

The first discharging hole is of a stepped hole structure, one end close to the first punching groove is a small hole end, and the other end close to the first sucking pump is a large hole end; the second discharge hole is of a stepped hole structure, one end close to the second stamping groove is a small hole end, and one end close to the second suction pump is a large hole end. The discharge opening adopts big small end structure, is convenient for in time get rid of the waste material that the punching press got off, avoids the waste material to lead to the fact the influence to next punching press.

And when the second upper die and the third upper die are close to the lower die, the elastic layer is firstly contacted with the plate on the lower die, and the elastic layer can well compress and fix the plate.

And the lower bottom surfaces of the second upper die and the third upper die are respectively provided with a pressing spring, and the lower end of the pressing spring is provided with a pressing plate. When the second upper die and the third upper die are close to the lower die, the pressing plate is pressed on the plate, and the plate is pressed by the elasticity of the pressing spring.

And the first upper die is internally provided with a limiting plate in a vertical sliding manner, the outer end of the limiting plate extends out of the bottom surface of the first upper die, a return spring which is abutted against the upper end of the limiting plate is arranged in the first upper die, and when the return spring is compressed, the lower end of the limiting plate is hidden in the first upper die. When the first mould of going up is opened, the limiting plate is under reset spring's effect, the lower extreme of limiting plate stretches out first last mould, when the sheet material carried a position forward, the front end and the limiting plate of sheet material offset, the accurate positioning of sheet material has been realized, in the course of the processing of buckling to the sheet material, first last mould is down, at the in-process of first last mould bottom surface and base contact, reset spring is compressed to the upper end of limiting plate, the limiting plate lower extreme retracts in first last mould, and when first last mould went upward again, the limiting plate will follow the first upward going of going up and stretch out again.

Compared with the prior art, the invention has the advantages that: when a sheet material is conveyed to the surface position of an upper die, a second stamping cylinder acts and drives a movable template to move downwards, a second upper die and a third upper die are simultaneously pressed on the upper surface of the sheet material to realize the positioning of the sheet material, then, a first stamping cylinder acts and a first upper die moves downwards along the side wall of a lower die, in the descending process of the first upper die, the side walls of the first upper die and the lower die realize the one-time bending processing of the outer end of the sheet material, then, the first upper die is kept still, a transverse sliding block in the lower die moves transversely, a transverse punching head on the transverse sliding block moves towards the direction of a first punching groove on the first upper die, a transverse punching head punches the sheet material on the side wall of the first upper die, synchronously, the transverse sliding block drives a vertical sliding block to move through a structure in inclined surface contact, a vertical punching head on the vertical sliding block moves towards the direction of a second punching groove on the second upper die, and the vertical punching head punches, after the primary bending and the secondary punching are finished, the cutting-off knife between the second upper die and the third upper die cuts off the sheet, so that the processed sheet metal part can be unloaded. In the sheet metal stamping die, in the process of one-time stamping, a bending processing structure for the sheet metal is formed between the side wall of the lower die and the bottom surface of the first upper die, a first punching processing structure for the sheet metal is formed between the side wall of the lower die and the side wall of the first upper die, and a second punching processing structure for the sheet metal is formed between the upper surface of the lower die and the lower surface of the second upper die.

Drawings

Fig. 1 is a schematic structural diagram of a sheet metal stamping die in an open state of the die in the embodiment of the invention;

FIG. 2 is a schematic structural diagram of a sheet metal stamping die in the stamping process in the embodiment of the invention;

FIG. 3 is a schematic structural view of a first upper mold upper limiting plate in the embodiment of the present invention;

FIG. 4 is a schematic structural view of a sheet metal part after the sheet metal part is stamped in the embodiment of the invention;

FIG. 5 is a schematic view of the sheet metal part of FIG. 4 in another orientation;

fig. 6 is a partially enlarged view of a portion a in fig. 1.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 6, the sheet metal stamping die in the present embodiment includes a support plate 33, a movable die plate 34, a lower die 2, an upper die unit, a first stamping cylinder 31, a second stamping cylinder 32, a cutting cylinder 44, a cutting blade 441, a discharging cylinder 61, an electromagnet 62, a blanking box, an intermittent feeding mechanism, a driving motor 51, a crank 52, a connecting rod 53, a horizontal slider 81, a horizontal punch 811, a vertical slider 82, a vertical punch 821, and a compression spring 83.

Wherein, the upper die unit comprises a first upper die 41, a second upper die 42 and a third upper die 43, the first stamping cylinder 31 and the second stamping cylinder 32 are arranged on the support plate 33 in parallel, the first upper die 41 is arranged at the output end of the first stamping cylinder 31, the movable die plate 34 is arranged on the output end of the second stamping cylinder 32, the second upper die 42 and the third upper die 43 are arranged below the movable die plate 34 in parallel, the lower die 2 is arranged right below the second upper die 42, the first upper die 41 descends along the side wall of the lower die 2 in the movement process, a first stamping groove 411 is arranged on the side wall of the first upper die 41 opposite to the lower die 2, a first discharging hole 412 communicated with the first stamping groove 411 is arranged on the first upper die 41, specifically, the first discharging hole 412 is a stepped hole structure, one end close to the first stamping groove 411 is a small hole end, one end close to the first suction pump is a large hole end, first discharge opening 412 is connected with first material pump of inhaling, the second punching press groove 421 has been seted up on the second mould 42 lateral wall relative with lower mould 2, set up on the second mould 42 with the communicating second discharge opening 422 of second punching press groove 421, concretely, second discharge opening 422 is the shoulder hole structure, the one end that is close to second punching press groove 421 is the aperture end, the one end that is close to the second material pump of inhaling is the aperture end, second discharge opening 422 is connected with the second material pump of inhaling, through adopting big end structure with the discharge opening, be convenient for in time get rid of the waste material 413 that the punching press got off, avoid waste material 413 to lead to the fact the influence to next punching press. Meanwhile, a limiting plate 401 is vertically and slidably arranged in the first upper die 41, the outer end of the limiting plate 401 extends out of the bottom surface of the first upper die 41, a return spring 402 which abuts against the upper end of the limiting plate 401 is arranged in the first upper die 41, and when the return spring 402 is compressed, the lower end of the limiting plate 401 is hidden in the first upper die 41. When the first upper die 41 is opened, the limiting plate 401 is under the action of the return spring 402, the lower end of the limiting plate 401 extends out of the first upper die 41, when the plate 1 is conveyed forwards to a certain position, the front end of the plate 1 abuts against the limiting plate 401, the accurate positioning of the plate 1 is realized, in the bending process of the plate 1, the first upper die 41 moves downwards, in the process that the bottom surface of the first upper die 41 is in contact with the base, the upper end of the limiting plate 401 compresses the return spring 402, the lower end of the limiting plate 401 retracts into the first upper die 41, and when the first upper die 41 moves upwards again, the limiting plate 401 will follow the upward movement of the first upper die 41 to extend out again.

The bottom of the lower die 2 is provided with a mounting groove 21, a transverse sliding block 81 is arranged in the mounting groove 21 in a transverse sliding manner, a transverse punch 811 which penetrates through the side wall of the lower die 2 and is matched with the first punching groove 411 in shape is arranged on the transverse sliding block 81, a sliding groove 22 which is vertically arranged and is communicated with the mounting groove 21 is arranged on the lower die 2, a vertical sliding block 82 is arranged in the sliding groove 22 in a sliding manner, a vertical punch 821 which penetrates through the upper surface of the lower die 2 and is matched with the second punching groove 421 in shape is arranged on the vertical sliding block 82, a compression spring 83 which is abutted against the vertical sliding block 82 is arranged at the bottom of the sliding groove 22, inclined planes are respectively formed on the opposite side surfaces of the vertical sliding block 82 and the transverse sliding block 81, the vertical sliding block 82 is contacted with the transverse sliding block 81 through the inclined planes, a driving motor 51 is arranged in the mounting groove 21, the output, during the sliding process of the horizontal sliding block 81 in the installation groove 21, the horizontal sliding block 81 pushes the vertical sliding block 82 to slide in the sliding groove 22.

In order to facilitate the classification of the stamped sheet metal part 10 and the sheet metal 1, a cutting cylinder 44 is arranged on the movable template 34 between the second upper die 42 and the third upper die 43, a cutting knife 441 is arranged at the output end of the cutting cylinder 44, and a cutting groove 23 is formed in the lower die 2 corresponding to the cutting knife 441.

Further, in order to achieve that the second upper die 42 and the third upper die 43 can be better pressed on the plate 1, elastic layers are respectively arranged on the lower bottom surfaces of the second upper die 42 and the third upper die 43, when the second upper die 42 and the third upper die 43 approach the lower die, the elastic layers are firstly contacted with the plate on the lower die 2, and the elastic layers can well press and fix the plate 1; or, the lower bottom surfaces of the second upper die 42 and the third upper die 43 are respectively provided with a pressing spring, the lower end of the pressing spring is provided with a pressing plate, when the second upper die 42 and the third upper die 43 approach the lower die, the pressing plate is pressed on the plate 1, and the plate 1 is pressed by the elasticity of the pressing spring.

In addition, in order to facilitate discharging, the outer side of the lower die 2 is located and is provided with a discharging cylinder 61 relative to the transverse sliding block 81, the output end of the discharging cylinder 61 is provided with an electromagnet 62, after the sheet metal stamping is completed, the completed sheet metal part 10 and the sheet metal 1 are cut off, at the moment, the piston rod of the discharging cylinder 61 extends out, the electromagnet 62 is electrified, the completed sheet metal part 10 is adsorbed on the electromagnet 62, then, the discharging cylinder 61 resets, the electromagnet 62 is powered off after quitting, and the completed sheet metal part 10 drops into the discharging box.

In addition, in order to realize automatic feeding, an intermittent feeding mechanism for conveying the plate 1 is arranged on the outer side of the lower die 2, as shown in fig. 1 and 6, the intermittent feeding mechanism comprises a toothed belt 71, a smooth belt pulley 72 for tensioning the toothed belt 71, and a tooth surface belt pulley 73 engaged with the toothed belt 71, a grooved pulley 75 is arranged on the central shaft of the tooth surface belt pulley 73, the grooved pulley 75 is in transmission connection with a dial 74, a plurality of arc surfaces 751 are uniformly distributed on the grooved pulley 75 in the circumferential direction, a strip-shaped groove 752 is formed between two adjacent arc surfaces 751, the dial 74 comprises a disc body 741 with an arc degree matched with the arc surface 751, a shift lever 742 is arranged on the disc body 741, a cylindrical pin 743 for inserting into the strip-shaped groove 752 is arranged on the shift lever 742, and a rotating shaft of the dial 74 is. In the feeding process of the intermittent feeding mechanism, the feeding motor rotates, the feeding motor drives the drive plate 74 to rotate, when the cylindrical pin 743 on the drive plate 74 is inserted into the strip-shaped groove 752 on the grooved pulley 75, the drive plate 74 drives the grooved pulley 75 to synchronously rotate, the toothed belt pulley 73 rotates to drive the toothed belt 71 to move, the toothed belt 71 drives the plate 1 to move forward for a distance, when the rest is needed, the grooved pulley 75 keeps still, the plate 1 keeps still on the toothed belt 71, the sheet metal processing is convenient to the plate at the front end, the length of the still time of the plate 1 can be realized by adjusting the rotating speed of the feeding motor, thus, the rotating speed of the feeding motor can be increased when the plate 1 is fed, the feeding speed of the plate 1 is accelerated, and in the process of stamping the front-end plate, the rotating speed of the feeding motor can be reduced, so that sufficient processing time is provided for stamping the plate 1.

In the sheet metal stamping process, firstly, a sheet material 1 is placed on a toothed belt 71, under the action of a dial 74 and a grooved pulley 75, the toothed belt 71 intermittently pushes the sheet material 1 towards a lower die 2, when the front end of the sheet material 1 reaches the surface position of the lower die 2, the front end part of the sheet material 1 is exposed outside the lower die 2, at this time, a second stamping cylinder 32 acts, the second stamping cylinder 32 drives a movable template 33 to move downwards, a second upper die 42 and a third upper die 43 are simultaneously pressed on the upper surface of the sheet material 1 to realize the positioning of the sheet material 1, then, a first stamping cylinder 31 acts, a first upper die 41 moves downwards along the side wall of the lower die 2, in the descending process of the first upper die 41, the side walls of the first upper die 41 and the lower die 2 realize one-time bending processing of the outer end of the sheet material 1, then, the first upper die 41 remains still, a transverse sliding block 81 in the lower die 2 moves transversely, a transverse punch 811 on the transverse sliding block 81 moves towards a first stamping groove 411 on, the transverse punch 811 punches a hole in the sheet metal 1 on the side wall of the first upper die 41, and meanwhile, because the transverse slide 81 and the vertical slide 82 are in inclined contact, the transverse motion of the transverse slide 81 synchronously drives the vertical slide 82 to move upwards, the vertical punch 821 on the vertical slide 82 moves towards the direction of the second punching groove 421 on the second upper die 42, the vertical punch 821 punches a hole in the sheet metal below the lower surface of the second upper die 42 for another time, and after one-time bending and two-time punching are completed, the sheet metal 1 is cut by the cutting knife 441 between the second upper die 42 and the third upper die 43, so that the processed sheet metal part 10 can be unloaded.

In summary, in the sheet metal stamping die of the present invention, in a primary stamping process, a bending processing structure for the sheet material 1 is formed between the side wall of the lower die 2 and the bottom surface of the first upper die 41, a first punching processing structure for the sheet material 1 is formed between the side wall of the lower die 2 and the side wall of the first upper die 41, and a second punching processing structure for the sheet material 1 is formed between the upper surface of the lower die 2 and the lower surface of the second upper die 42, so that after the sheet material 1 is positioned once, three different processing surfaces are formed between the upper die unit and the lower die 2, and thus, the primary bending and punching processing in two different directions on the sheet material 1 can be simultaneously achieved, and the efficiency of sheet metal stamping is improved.

Claims

1. The utility model provides a panel beating stamping die, includes backup pad (33), movable mould board (34), lower mould (2) and goes up the mould unit, its characterized in that: the device is characterized in that a first stamping cylinder (31) and a second stamping cylinder (32) are arranged on the supporting plate (33), the upper die unit comprises a first upper die (41), a second upper die (42) and a third upper die (43), the first upper die (41) is arranged at the output end of the first stamping cylinder (31), the movable die plate (34) is arranged on the output end of the second stamping cylinder (32), the second upper die (42) and the third upper die (43) are arranged below the movable die plate (34) in parallel, the lower die (2) is arranged right below the second upper die (42), the first upper die (41) descends along the side wall of the lower die (2) in the movement process, a first stamping groove (411) is formed in the side wall of the first upper die (41) opposite to the lower die (2), a first discharging hole (412) communicated with the first stamping groove (411) is formed in the first upper die (41), and the first discharging hole (412) is connected with a first material suction pump, a second punching groove (421) is arranged on the side wall of a second upper die (42) opposite to the lower die (2), a second discharging hole (422) communicated with the second punching groove (421) is arranged on the second upper die (42), the second discharging hole (422) is connected with a second material suction pump, a cutting cylinder (44) is arranged between the second upper die (42) and a third upper die (43) on the movable die plate (34), the output end of the cutting cylinder (44) is provided with a cutting knife (441), a cutting groove (23) is arranged on the lower die (2) corresponding to the cutting knife (441), an installation groove (21) is arranged at the bottom of the lower die (2), a transverse sliding block (81) is arranged in the installation groove (21) in a transverse sliding manner, a transverse punching head (811) which penetrates through the side wall of the lower die (2) and is matched with the first punching groove (411) in shape is arranged on the lower die (2), and a sliding groove (22) which is vertically arranged and communicated with the installation groove (21) is arranged on the lower die (2), a vertical sliding block (82) is arranged in the sliding groove (22) in a sliding mode, a vertical punching head (821) which penetrates through the upper surface of the lower die (2) and is matched with the second punching groove (421) in shape is arranged on the vertical sliding block (82), a compression spring (83) which is abutted against the vertical sliding block (82) is arranged at the bottom of the sliding groove (22), inclined planes are formed on the opposite side faces of the vertical sliding block (82) and the transverse sliding block (81) respectively, the vertical sliding block (82) is in contact with the transverse sliding block (81) through the inclined planes, a driving motor (51) is arranged in the mounting groove (21), the output end of the driving motor (51) is connected with a crank (52), a connecting rod (53) is hinged between the crank (52) and the transverse sliding block (81), the transverse sliding block (81) is arranged in the mounting groove (21), and the transverse sliding block (81) pushes the vertical sliding block (82) to.

2. The sheet metal stamping die of claim 1, wherein: the outer side of the lower die (2) is provided with a discharging cylinder (61) at a position opposite to the transverse sliding block (81), and the output end of the discharging cylinder (61) is provided with an electromagnet (62).

3. The sheet metal stamping die of claim 1, wherein: the intermittent feeding mechanism is characterized in that an intermittent feeding mechanism used for conveying a plate material (1) is arranged on the outer side of the lower die (2), the intermittent feeding mechanism comprises a toothed belt (71), a smooth surface belt wheel (72) used for tensioning the toothed belt (71) and a tooth surface belt wheel (73) meshed with the toothed belt (71), a grooved wheel (75) is arranged on a central shaft of the tooth surface belt wheel (73), the grooved wheel (75) is in transmission connection with a driving plate (74), a plurality of cambered surfaces (751) are uniformly distributed in the circumferential direction of the grooved wheel (75), a strip-shaped groove (752) is formed between every two adjacent cambered surfaces (751), the driving plate (74) comprises a plate body (741) with the radian matched with the cambered surfaces (751), a driving lever (742) is arranged on the plate body (741), a cylindrical pin (743) used for being inserted into the strip-shaped groove (752) is arranged on the driving lever (742), and.

4. The sheet metal stamping die of claim 1, wherein: the first discharge hole (412) is of a stepped hole structure, one end close to the first stamping groove (411) is a small hole end, and the other end close to the first suction pump is a large hole end.

5. The sheet metal stamping die of claim 1, wherein: the second discharge hole (422) is of a stepped hole structure, one end close to the second punching groove (421) is a small hole end, and the other end close to the second suction pump is a large hole end.

6. The sheet metal stamping die of claim 1, wherein: and elastic layers are respectively arranged on the lower bottom surfaces of the second upper die (42) and the third upper die (43).

7. The sheet metal stamping die of claim 1, wherein: and the lower bottom surfaces of the second upper die (42) and the third upper die (43) are respectively provided with a pressing spring, and the lower end of the pressing spring is provided with a pressing plate.

8. The sheet metal stamping die of claim 1, wherein: a limiting plate (401) is vertically arranged in the first upper die (41) in a sliding mode, the outer end of the limiting plate (401) extends out of the bottom surface of the first upper die (41), a return spring (402) which is abutted against the upper end of the limiting plate (401) is arranged in the first upper die (41), and when the return spring (402) is compressed, the lower end of the limiting plate (401) is hidden in the first upper die (41).