CN211276075U - Electromagnetic punching forming device - Google Patents

Abstract

The utility model provides an electromagnetism forming device that punches a hole, include: the upper die assembly comprises a coil box, a coil and an upper plate, wherein the coil is installed in the coil box, and the coil box is installed on the upper plate; the lower die assembly is detachably fixed on the upper die assembly and comprises a base, a large female die and a small female die, a mounting hole is formed in the base, the large female die is mounted in the mounting hole, a blanking hole is formed in the large female die, the small female die has multiple types, and the small female die of the multiple types can be selectively mounted at the end part of the large female die; a power supply device electrically connected with the coil. The utility model provides an electromagnetism forming device that punches a hole adopts the strong magnetic field of transient state to punch a hole the shaping to the appearance piece, and the steady quality, the shaping limit is high, can realize the processing of multiple hole shape, simple structure, and is efficient.

Description

Electromagnetic punching forming device

Technical Field

The utility model relates to a sheet metal plastic working takes shape technical field, particularly, relates to an electromagnetism forming device that punches a hole.

Background

At present, light weight gradually becomes a development trend in the fields of automobiles, aerospace and the like, and light alloys such as aluminum alloy and the like are difficult to meet forming requirements and applied to the advanced manufacturing field due to poor room temperature forming performance of the light alloys.

The traditional punching process is complex in structure installation, large in distance adjusting error of the punch and die, and easy to break at the edges of a drawing fillet and a flanging hole, in addition, the size precision of a workpiece is reduced due to the abrasion of a cutting edge, and the development of the traditional punching technology is greatly restricted by the problems of the service life of a die, the cost and the like.

However, the electromagnetic punching only needs a single die, and has the characteristics of high forming speed, high forming precision and the like, so that the defects of the traditional punching can be effectively overcome. At present, scholars at home and abroad begin to use an electromagnetic punching technology for plastic forming, for example, patent document CN104841761A proposes an electromagnetic punching and flanging forming method and device for an alloy plate, wherein pulsed electromagnetic force is adopted to drive the plate to deform, the plate is broken after contacting with a die, and the punching and forming process is completed, but the punching die is single and can not be replaced, and only a round hole can be punched; in patent document CN203994783, an electromagnetic punching machine is designed, in which a punching end is driven by a pulsed electromagnetic force to move downward to complete punching, but the punching end increases the manufacturing cost, easily scratches a workpiece, reduces the dimensional accuracy of the workpiece, and does not involve the problems of positioning the workpiece and multiple working conditions.

In summary, the conventional stamping process is difficult to meet the forming requirements of various light materials. Although the electromagnetic forming technology has been applied to punching forming with simple shape and structure by virtue of the advantages of high precision and high efficiency, the problems of low die changing efficiency, difficult positioning and the like in multiple processes are solved.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electromagnetic punching forming device, which can overcome the instability of forming quality in the conventional punching process, and can realize the formation of multiple types of holes.

In order to achieve the above object, the present invention provides an electromagnetic punching forming device, including: the upper die assembly comprises a coil box, a coil and an upper plate, wherein the coil is installed in the coil box, and the coil box is installed on the upper plate; the lower die assembly is detachably fixed on the upper die assembly and comprises a base, a large female die and a small female die, a mounting hole is formed in the base, the large female die is mounted in the mounting hole, a blanking hole is formed in the large female die, the small female die has multiple types, and the small female die of the multiple types can be selectively mounted at the end part of the large female die; a power supply device electrically connected with the coil.

Further, the mounting hole is the shoulder hole, big die is installed in the shoulder hole, just all install at the both ends of big die little die, just big die both ends the type of little die is different.

Furthermore, an annular pressing plate coaxial with the blanking hole is arranged in the blanking hole of the large female die, the annular pressing plate is fixed in the large female die, the small female die at the first end of the large female die is overlapped on the step surface of the stepped hole, and the small female die at the second end of the large female die is supported and connected to the bottom of the annular pressing plate.

Furthermore, the large female die, the small female die and the base are provided with positioning pin holes which are communicated with each other, and the large female die, the small female die and the base are fixedly connected through positioning pins which penetrate through the positioning pin holes.

Further, the large concave die and the small concave die are made of different materials.

Furthermore, the small female dies of various types have different hole shapes, and the small female dies comprise triangular small female dies or round small female dies or oval small female dies.

Furthermore, an installation groove is formed in the upper plate, and the coil box is installed in the installation groove; the coil is a flat spiral coil, two binding posts are arranged on the flat spiral coil, and the two binding posts penetrate out of the coil box and the upper plate.

Furthermore, the periphery of the coil is provided with a positioning column, a positioning hole matched with the positioning column is arranged in the coil box, and the periphery of the positioning column is sleeved with an insulating sleeve.

Further, a cushion pad is arranged at the bottom of the coil, and an insulating layer is arranged on one side, close to the lower die assembly, of the coil; and an insulating material is filled between the coil and the coil box.

Furthermore, the cross sections of the base and the upper plate are rectangular surfaces, the length and the width of the two rectangular surfaces are consistent, corresponding threaded holes are formed in the base and the upper plate, and the base and the upper plate are connected together through bolts penetrating through the threaded holes.

Use the technical scheme of the utility model, when needs carry out the multiple operation retooling and punch a hole and take shape, at first need carry out the equipment of electromagnetism forming device that punches a hole, assemble last mould subassembly and bed die subassembly, after the equipment is good, the appearance piece that will carry out stamping forming places between last mould subassembly and bed die subassembly, then will go up mould subassembly and bed die subassembly and carry out the box mould, recycle power supply unit and supply power to the coil, discharge to the coil, strong pulse current passes through the coil and produces the strong magnetic field of transient state, the strong magnetic field of transient state can make conductor on every side produce secondary magnetic field. The magnetic forces generated by the two magnetic fields repel each other, the sample piece moves upwards to act with the right-angle cutting edge of the small female die, and the punching process is completed instantly. The materials dropped by the punching are dropped out of the blanking hole. In the process of actual use, because the small female die has multiple models, in the actual use, the small female die with different models can be replaced, and then the sample pieces with different hole shapes are formed by punching. The utility model provides an electromagnetism forming device that punches a hole adopts the strong magnetic field of transient state to punch a hole the shaping to the appearance piece, and the steady quality, the shaping limit is high, can realize the processing of multiple hole shape, simple structure, and is efficient.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:

fig. 1 schematically shows a cross-sectional view of an electromagnetic punch forming apparatus of the present invention;

fig. 2 schematically shows a bottom view of a coil of the electromagnetic punch forming device of the present invention;

fig. 3 schematically shows a side view of a coil of the electromagnetic punch forming device of the present invention;

fig. 4 schematically shows a perspective view of a coil of the electromagnetic punch forming device of the present invention;

fig. 5 schematically shows a cross-sectional view of an insulating sleeve of the electromagnetic punch forming device of the present invention;

FIG. 6 schematically illustrates a top view of an upper plate of the electromagnetic punch forming device of the present invention;

FIG. 7 schematically illustrates a cross-sectional view A-A of the upper deck of FIG. 6;

fig. 8 schematically shows a front view of a large female die of the present invention;

fig. 9 schematically shows a top view of a coil box of the electromagnetic punch forming device of the present invention;

fig. 10 schematically shows a cross-sectional view of a coil box of an electromagnetic punch forming apparatus of the present invention;

fig. 11 schematically shows a front view of a first type of dimple die in an electromagnetic punch forming apparatus according to the present invention;

FIG. 12 schematically illustrates a front view of a second type of small female die in an electromagnetic punch forming apparatus of the present invention;

FIG. 13 is a front view schematically showing a third type of small female die in the electromagnetic punch forming apparatus of the present invention;

wherein the figures include the following reference numerals:

10. an upper die assembly; 11. a coil box; 12. a coil; 121. a binding post; 122. a positioning column; 13. an upper plate; 131. installing a groove; 132. a threaded hole; 14. an insulating sleeve; 15. a cushion pad; 16. an insulating layer; 17. an insulating material; 20. a lower die assembly; 21. a base; 211. mounting holes; 22. a large female die; 221. a blanking hole; 23. a small female die; 24. a positioning pin hole; 25. and an annular pressure plate.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As described in the background art, the structure of the electromagnetic punching and forming apparatus in the present embodiment is improved, because the punching and forming apparatus in the related art has problems that the efficiency is low, the quality is unstable, and it is difficult to form holes of various types in a multi-step die change.

Referring to fig. 1 to 13, according to an embodiment of the present invention, an electromagnetic punch forming apparatus is provided, which includes an upper mold assembly 10, a lower mold assembly 20, and a power supply device (not shown).

Wherein, the upper die assembly 10 comprises a coil box 11, a coil 12 and an upper plate 13, and when actually assembling, the coil 12 is installed in the coil box 11, and then the coil box 11 is installed on the upper plate 13; the lower die assembly 20 is detachably fixed on the upper die assembly 10, the lower die assembly 20 comprises a base 21, a large female die 22 and a small female die 23, a mounting hole 211 is formed in the base 21, the large female die 22 is mounted in the mounting hole 211, a blanking hole 221 is formed in the large female die 22, the small female die 23 has multiple types, and the small female dies 23 of the multiple types can be selectively mounted at the end part of the large female die 22; the power supply is electrically connected to the coil 12.

When multi-process die change and punching forming are required, firstly, an electromagnetic punching forming device is required to be assembled, an upper die assembly 10 and a lower die assembly 20 are assembled, after the assembly is completed, a sample piece required to be punched and formed is placed between the upper die assembly 10 and the lower die assembly 20, then the upper die assembly 10 and the lower die assembly 20 are subjected to box die, a power supply device is used for supplying power to a coil 12 to discharge electricity to the coil 12, strong pulse current passes through the coil 12 to generate a transient strong magnetic field, and the transient strong magnetic field can enable surrounding conductors to generate a secondary magnetic field. The magnetic forces generated by the two magnetic fields repel each other, the sample piece moves upwards to act with the right-angle cutting edge of the small female die 23, and the punching process is completed instantly. The punched-out material falls out of the blanking hole 221.

In the actual use process, because the small female die 23 has multiple types, in the actual use process, the small female die 23 with different types can be replaced, and then the sample pieces with different hole shapes are formed by punching.

The electromagnetic punching forming device in the embodiment adopts a transient strong magnetic field to punch and form the sample piece, has stable quality and high forming limit, can realize the processing of various hole shapes, and has simple structure and high efficiency.

In order to facilitate the installation of the large female die 22, the installation hole 211 in the embodiment is a stepped hole, during actual installation, the large female die 22 is installed in the stepped hole, the large female die 22 is limited through the stepped hole, the two ends of the large female die 22 are provided with the small female dies 23, the types of the small female dies 23 at the two ends of the large female die 22 are different, in the actual die closing process, an operator can select to use the small female die 23 at the first end of the large female die 22 to punch a hole according to different punching requirements of a sample piece, or use the small female die 23 at the second end of the large female die 22 to punch a hole, the application range is wide, the operation is simple and fast, during actual die closing, only the first end of the large female die 22 needs to be selected to be close to the upper die assembly 10 to close the die or the second end of the large female die 22 needs to be.

In order to support and limit the small concave die 23, an annular pressing plate 25 coaxial with the blanking hole 221 is arranged in the blanking hole 221 of the large concave die 22 in the embodiment, the annular pressing plate 25 is fixed in the large concave die 22, the small concave die 23 at the first end of the large concave die 22 is erected on the step surface of the stepped hole, and the small concave die 23 at the second end of the large concave die 22 is connected to the bottom of the annular pressing plate 25 in a supporting manner.

Of course, in other embodiments of the present invention, the ring-shaped pressing plate 25 can be set to have a structure such as a limiting rib, and other deformation modes under the concept of the present invention are all within the protection scope of the present invention.

In order to facilitate the fixed connection of the large concave die 22, the small concave die 23 and the base 21, in this embodiment, the large concave die 22, the small concave die 23 and the base 21 are provided with positioning pin holes 24 which are communicated with each other, and during actual assembly, the large concave die 22, the small concave die 23 and the base 21 are all connected and fixed through positioning pins which are inserted into the positioning pin holes 24.

When the small female die 23 needs to be replaced, the small female die 23 only needs to be replaced from the positioning pin, and the small female dies 23 of other models can be replaced.

During actual assembly, can also be in the same place through structure fixed connection such as bolt or buckle or screw between big die 22, little die 23 and the base 21, as long as be in the utility model discloses a other deformation mode under the design are all within the utility model discloses a within the protection scope.

In actual processing, the large concave die 22 and the small concave die 23 in this embodiment are made of different materials, wherein the structural strength of the small concave die 23 is higher than that of the large concave die 22, and the small concave die 23 is made of an alloy material, so that the service life of the small concave die 23 is prolonged. In this embodiment, the punching forming mold is divided into the large female mold 22 and the small female mold 23, and then the small female mold 23 with a longer service life requirement is manufactured by using a material with higher strength, so that the production and processing requirements of the large female mold 22 can be reduced, and the production cost of the electromagnetic punching forming device in this embodiment can be effectively reduced.

Specifically, the small concave molds 23 of different types in this embodiment have different hole shapes, as shown in fig. 11 to 13, the small concave molds 23 in this embodiment include triangular small concave molds, circular small concave molds, or elliptical small concave molds, and when different samples need to be processed, only the small concave molds 23 of different types need to be replaced. It should be noted that the triangular small concave die in the present embodiment refers to a small concave die having a triangular through hole, correspondingly, the circular small concave die refers to a small concave die having a circular through hole, and the elliptical small concave die refers to a small concave die having an elliptical through hole.

In practical design, the small concave die 23 in this embodiment may also be a small concave die with multi-deformation through holes or a small concave die with other special-shaped structures.

It can be seen that the base 21 in this embodiment has a stepped mounting hole 211 in the center for placing the large die 22. The large female die 22 is cylindrical, a stepped blanking hole 221 is formed in the large female die 22, blanking is facilitated, the large female die 22 and the small female die 23 are made of dissimilar materials, the small female die 23 is thin cylindrical, and a hole (circular, oval or triangular) with a special shape is formed in the middle of the small female die 23 and is made of special alloy. The small concave die 23 is in a thin cylindrical shape, a positioning pin hole 24 is formed in the edge of the small concave die 23, and the small concave die 23 is accurately assembled in the large concave die 22 through the positioning pin hole 24. The same structure is also present on the large female die 22, and the large female die 22 is assembled with the base 21. To ensure efficiency of assembly, the registration pin holes 24 on the lower mold assembly 20 are all of uniform size.

The core of the electromagnetic punching forming device is provided with small concave dies 23 with different models, including a triangular small concave die for punching a triangular hole, an elliptical small concave die for forming an elliptical hole, a most conventional round hole die and the like. The shape of the triangular small female die through hole is similar to a triangle, a fillet exists at the triangle, and the sizes of the fillets of the two triangular dies are different. The oval small concave die through hole is oval. The small female dies 23 are relatively simple in structure and strong in replaceability, and can be assembled and disassembled within a few minutes. The preformed holes formed by the electromagnetic punching forming device are various in types, are not limited to triangular, elliptical and circular, and can be formed by other types of holes. In addition to the diversity of the holes and the requirements for the size of the holes, the small female die 23 can be adjusted quickly, which ensures the fast changing requirements of the actual industrial production.

In order to facilitate the installation of the coil box 11, the upper plate 13 in this embodiment is provided with an installation groove 131, and during actual installation, the coil box 11 is installed in the installation groove 131; correspondingly, the coil 12 is a flat spiral coil, two terminals 121 are arranged on the flat spiral coil, and the two terminals 121 penetrate through the coil box 11 and the upper plate 13, so as to be electrically connected with a power supply device. There are two fastening round through holes per side of the post 121. The coil box 11 is provided with four circular through holes and two rectangular holes, the size and the position of the circular hole on the coil box 11 are consistent with those of the circular hole on the upper plate 13, a rectangular boss exists on the rectangular hole on the coil box 11, the outer size of the boss is consistent with that of the rectangular hole on the upper plate 13, and the rectangular hole on the coil box 11 is designed by taking the rectangular wiring terminal 121 on the coil 12 as a reference.

In this embodiment, the positioning post 122 is disposed on the outer periphery of the coil 12, the positioning hole matched with the positioning post 122 is disposed in the coil box 11, and the insulating sleeve 14 is sleeved on the outer periphery of the positioning post 122, so as to improve the safety of the electromagnetic punching forming apparatus in this embodiment.

Preferably, the bottom of the coil 12 in this embodiment is provided with a cushion pad 15, and the side of the coil 12 adjacent to the lower mold assembly 20 is provided with an insulating layer 16. An insulating material 17 is filled between the coil 12 and the coil box 11, the insulating material 17 is Hashunast 985FR epoxy resin and is prepared by mixing glue A and glue B, and the mass ratio of the glue A to the glue B is 5: 1.

In order to facilitate die assembly, the cross sections of the base 21 and the upper plate 13 in the embodiment are rectangular surfaces, the length and the width of the two rectangular surfaces are consistent, the base 21 and the upper plate 13 are both provided with corresponding threaded holes 132, and the base 21 and the upper plate 13 are connected together through bolts penetrating through the threaded holes 132.

The specific punching process of the electromagnetic punching forming device in the embodiment is as follows:

step 1: assembling a lower die assembly 20 part of the electromagnetic punching forming device, wherein the assembling sequence is respectively a base 21, a large female die 22, a small female die 23 and an annular pressing plate 25, the assembling sequence is that the large female die 22 is connected and positioned on the base 21 through a stepped hole and a positioning pin, the small female die 23 is arranged on the large female die 22, and the position relation between the large female die 22 and the small female die 23 is determined through the positioning pin;

step 2: the upper die assembly 10 of the electromagnetic punching forming device is partially assembled in sequence of the coil 12, the coil box 11 and the upper plate 13, a certain flow exists in the assembly, and the assembly process needs to be carried out according to the assembly flow. The first step of assembly is the assembly of the coil 12 and the coil box 11, and the second step is the assembly of the upper plate 13, the upper plate 13 can ensure the rigidity of the upper die assembly 10, and the upper plate 13 is fastened on the coil box 11 through the threaded holes 132.

And step 3: the sample piece and the lower die assembly 20 are partially fixed, the sample piece is pressed on the lower die assembly 20 through two pressing plates, and the pressing plates are fastened on the lower die assembly 20 through threaded holes. The test sample pieces are all plates with the same specification.

And 4, step 4: the upper and lower mold assemblies 10 and 20 are partially closed and the upper and lower mold assemblies 10 and 20 are bolted together.

And 5: and connecting a power supply device, and performing charging and discharging after the power supply device is checked to be intact. The discharge circuit operates so that when the voltage in the charged capacitor bank reaches a threshold, a strong current can pass through the auxiliary discharge gap and the coil 12.

Step 6: and (6) taking the workpiece. After the punching process is finished, bolts for fastening the parts of the upper die assembly 10 and the lower die assembly 20 are loosened, the part of the upper die assembly 10 is moved away, the fastening screws on the pressing plate are taken out, and the punched plate is taken out.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

(1) the utility model discloses an electromagnetism forming device that punches a hole's electromagnetism section of punching a hole is compared with the tradition and is had no obvious bright area, almost no burr.

(2) The utility model discloses an electromagnetism forming device that punches a hole's electromagnetism forming process that punches a hole is with the deformation of punching a hole of electromagnetic force drive panel, can accomplish in the very short time, and its whole processingequipment is simple, the process time is short, production efficiency is high is fit for mass production more.

(3) The test mold is simple to disassemble and strong in replaceability. When different types of holes are required, only the small concave dies of the holes of different types need to be replaced.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electromagnetic punch forming apparatus, comprising:

the coil forming die comprises an upper die assembly (10), wherein the upper die assembly (10) comprises a coil box (11), a coil (12) and an upper plate (13), the coil (12) is installed in the coil box (11), and the coil box (11) is installed on the upper plate (13);

the lower die assembly (20) is detachably fixed on the upper die assembly (10), the lower die assembly (20) comprises a base (21), a large female die (22) and a small female die (23), a mounting hole (211) is formed in the base (21), the large female die (22) is mounted in the mounting hole (211), a blanking hole (221) is formed in the large female die (22), the small female die (23) has multiple types, and the small female dies (23) of the multiple types can be selectively mounted at the end of the large female die (22);

a power supply device electrically connected to the coil (12).

2. An electromagnetic punch forming device according to claim 1, characterized in that the mounting hole (211) is a stepped hole, the large female die (22) is mounted in the stepped hole, the small female die (23) is mounted at both ends of the large female die (22), and the types of the small female dies (23) at both ends of the large female die (22) are different.

3. An electromagnetic punching forming device according to claim 2, characterized in that an annular pressing plate (25) coaxial with the blanking hole (221) is arranged in the blanking hole (221) of the large female die (22), the annular pressing plate (25) is fixed in the large female die (22), the small female die (23) at the first end of the large female die (22) is erected on the step surface of the stepped hole, and the small female die (23) at the second end of the large female die (22) is in supporting connection with the bottom of the annular pressing plate (25).

4. An electromagnetic punching forming device according to claim 1, characterized in that the large female die (22), the small female die (23) and the base (21) are provided with mutually communicated positioning pin holes (24), and the large female die (22), the small female die (23) and the base (21) are connected and fixed through positioning pins arranged in the positioning pin holes (24).

5. An electromagnetic punch forming apparatus according to claim 1, characterised in that the large female die (22) and the small female die (23) are made of dissimilar materials.

6. An electromagnetic punch forming device according to claim 1, characterized in that the hole shape of each type of said small female die (23) is different, said small female die (23) comprising a triangular small female die or a circular small female die or an elliptical small female die.

7. An electromagnetic punch forming apparatus according to claim 1, wherein the upper plate (13) is provided with a mounting recess (131), and the coil box (11) is mounted in the mounting recess (131);

the coil (12) is a flat spiral coil, two binding posts (121) are arranged on the flat spiral coil, and the two binding posts (121) penetrate out of the coil box (11) and the upper plate (13).

8. An electromagnetic punching forming device according to claim 7, characterized in that the periphery of the coil (12) is provided with a positioning column (122), the coil box (11) is provided with a positioning hole matched with the positioning column (122), and the periphery of the positioning column (122) is sleeved with an insulating sleeve (14).

9. An electromagnetic punch forming apparatus according to claim 1, wherein a cushion pad (15) is provided at a bottom of the coil (12), and an insulating layer (16) is provided at a side of the coil (12) adjacent to the lower die assembly (20);

an insulating material (17) is filled between the coil (12) and the coil box (11).

10. An electromagnetic punching forming device according to claim 1, characterized in that the cross section of the base (21) and the cross section of the upper plate (13) are rectangular surfaces, the length and the width of the two rectangular surfaces are consistent, corresponding threaded holes (132) are arranged on the base (21) and the upper plate (13), and the base (21) and the upper plate (13) are connected together through bolts inserted in the threaded holes (132).

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