Stamping back-extrusion device

Abstract

The invention provides a stamping and back-extruding device, relates to the technical field of stamping, and aims to improve the production efficiency of a shell and reduce the device cost. The stamping back-extrusion device comprises a lower die supporting structure, a male die assembly and a back-extrusion assembly, the male die assembly is located on one side of the lower die supporting structure, the male die assembly comprises a male die base plate and a male die body which are arranged in the first direction, and the male die body is located on the side, away from the lower die supporting structure, of the male die base plate; the back-extrusion assembly is arranged on the lower die supporting structure and comprises a back-extrusion main body part, the back-extrusion main body part surrounds the periphery of the male die assembly, and the back-extrusion main body part and the male die assembly can move relatively in the first direction; wherein the male die assembly has a first working state and a second working state, in the first working state, the male die assembly and the lower die supporting structure are relatively fixed in the first direction, and in the second working state, the male die assembly can move relative to the lower die supporting structure in the first direction.

Description

Technical Field

[0001] The present application relates to the field of stamping technology, and in particular to a stamping back-extrusion device. Background Art

[0002] To give electronic devices like consumer electronics (3C products) a metallic appearance, their housings are typically made of metal. These housings are typically formed using a combination of stamping and extrusion processes to minimize the rounded corners (R) between the side panels and the base. However, during the manufacturing process, the stamping and extrusion processes must be performed on separate machines, resulting in a complex manufacturing process, low production efficiency, and high equipment costs. Summary of the Invention

[0003] The embodiment of the present application provides a stamping and back-extrusion device for improving the production efficiency of the housing and reducing the cost of the device.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] The present application provides a stamping and back-extrusion device, which includes a lower die support structure, a punch assembly, and a back-extrusion assembly. The punch assembly is located on one side of the lower die support structure. The punch assembly includes a punch pad and a punch body arranged in a first direction. The punch body is located on the side of the punch pad away from the lower die support structure; the back-extrusion assembly is arranged on the lower die support structure, and the back-extrusion assembly includes a back-extrusion main body. The back-extrusion main body surrounds the outer periphery of the punch assembly, and the back-extrusion main body and the punch assembly can move relative to each other along the first direction; wherein the punch assembly has a first working state and a second working state. In the first working state, the punch assembly and the lower die support structure are relatively fixed in the first direction. In the second working state, the punch assembly can move relative to the lower die support structure along the first direction.

[0006] The punching and back-extrusion device in the present application has a punch assembly with a first working state and a second working state, and can switch between the first working state and the second working state, so that the punching and back-extrusion device has a punching function and a back-extrusion function. In this way, after the workpiece to be processed is punched by the punching and back-extrusion device, the workpiece after the punching process can continue to be back-extruded by the punching and back-extrusion device to obtain products such as shells. In other words, the stamping process and the back-extrusion process can be carried out on the same device. Therefore, after the workpiece to be processed is punched, there is no need to transfer the workpiece between different devices. On the one hand, it can simplify the processing process of the shell, improve production efficiency, and reduce device cost and production cost. On the other hand, it can also avoid scratches, bumps and other damages caused by the workpiece when it is transferred between different devices, which can effectively improve the production yield of the shell.

[0007] In a possible implementation, the punch back extrusion device comprises a locking assembly, the locking assembly comprises a first locking piece and a second locking piece, and the first locking piece and the second locking piece have a first cooperation state and a second cooperation state. In the first cooperation state, the first locking piece abuts against the punch pad plate to limit the movement of the punch pad plate towards the lower die support structure. In the second cooperation state, the first locking piece can move in a second direction relative to the punch assembly to enable the punch assembly to move in a first direction relative to the lower die support structure. The second direction is perpendicular to the first direction.

[0008] In this way, the working state of the punch assembly can be adjusted by adjusting the cooperation state of the first locking piece and the second locking piece, so that the punch assembly can be switched between the first working state and the second working state, thereby enabling the punch back extrusion device to have a punching function and a back extrusion function.

[0009] In a possible implementation, the second locking piece can move in the first direction relative to the lower die support structure to switch the first locking piece and the second locking piece between the first cooperation state and the second cooperation state. In this way, the switching of the first locking piece and the second locking piece between different cooperation states can be realized by driving the second locking piece to move in the first direction relative to the first locking piece, which is beneficial to simplify the structure of the punch back extrusion device.

[0010] In a possible implementation, the punch back extrusion device comprises a die assembly, the die assembly comprises a die body and a die inner stripping piece, the die body is movable relative to the punch assembly in a first direction, and the die body is provided with an assembly hole. The die inner stripping piece is arranged in the assembly hole and is movable relative to the die body in the first direction. The second locking piece is fixed relative to the die body.

[0011] In this way, when the die body moves in the first direction relative to the lower die support structure, the second locking piece can move synchronously with the die body to switch the first locking piece and the second locking piece between the first cooperation state and the second cooperation state, without the need for an additional driving piece to drive the movement of the second locking piece, thereby simplifying the structure of the punch back extrusion device and reducing the cost of the punch back extrusion device.

[0012] In a possible implementation, the first locking piece has a first locking surface parallel to the first direction. In the first cooperation state, the second locking piece is located on a side of the first locking piece away from the central axis of the punch pad plate, and the second locking piece abuts against the first locking surface. In the second cooperation state, the second locking piece is disengaged from the first locking surface.

[0013] In this way, by setting the first abutment surface, when the stamping back-extrusion device performs the stamping process, on the one hand, the first locking surface can be prevented from interfering with the movement of the second locking part toward the lower die support structure, thereby preventing the first locking surface from interfering with the movement of the die body toward the lower die support structure; on the other hand, it can also ensure that the second locking part and the first locking surface can always maintain abutment during the entire stamping process, so that the first locking part and the second locking part can maintain the first matching state during the entire stamping process, and then the punch assembly can be limited by the cooperation of the first locking part and the punch pad during the stamping process, so that the punch pad and the lower die support structure remain relatively fixed; on the other hand, it can also ensure that the first locking part and the second locking part can switch smoothly between the first matching state and the second matching state, with a simple structure and ingenious design.

[0014] In one possible implementation, the second locking member has a second locking surface. In a first engaged state, the first locking surface abuts the second locking surface; in a second engaged state, the first locking surface and the second locking surface disengage. Thus, in the first engaged state, the second locking surface abuts the first locking surface, increasing the contact area between the first and second locking members during the stamping process, reducing the extrusion force between the first and second locking members, and thereby improving the structural strength of the first and second locking members.

[0015] In one possible implementation, the second locking member includes a connecting rod and a raised portion. The connecting rod includes a first surface that faces the punch plate in a first mating state. The raised portion is fixedly connected to the first surface, and the second locking surface is located on an end surface of the raised portion facing away from the connecting rod. A specific structure of the second locking member is provided.

[0016] In one possible implementation, the second locking member includes a fixing portion fixedly connected to one end of the connecting rod and protruding from the outer circumference of the connecting rod to form a fixing ear. In this way, the second locking member can be secured to the die body or the upper die support structure via the fixing portion. This provides a simple structure and facilitates processing.

[0017] In one possible implementation, the first locking member includes a first mating surface, and the second locking member also includes a second mating surface. In the second mating state, the second locking member abuts against the first mating surface; wherein, in the direction from the punch body to the punch pad, the first mating surface extends obliquely toward the center axis of the punch pad.

[0018] In this way, in the second mating state, the first locking member and the second locking member can cooperate through the first mating surface and the second mating surface. On the one hand, it is beneficial to improve the stability of the first locking member moving along the second direction. On the other hand, when the second locking member moves upward relative to the lower mold support structure, it can also push the first locking member to move along the second direction toward the punch pad through the cooperation of the first mating surface and the second mating surface, which is beneficial to realize the resetting of the first locking member and ensure that the stamping and back-extrusion device can be smoothly switched under different processes.

[0019] In one possible implementation, the first mating surface is connected to the first locking surface. Thus, after the second locking member is disengaged from the first locking surface, the first mating surface can be mated with the second mating surface, enabling seamless switching between the first and second mating states of the first and second locking members. This enables seamless switching between the stamping process and the re-extrusion process of the stamping and re-extrusion device, thereby improving the working efficiency of the stamping and re-extrusion device.

[0020] In one possible implementation, the stamping and re-extrusion device further includes a reset elastic member, which is located on a side of the first locking member facing away from the central axis of the punch pad, and in the first mating state, the reset elastic member is in a naturally extended state. Thus, on the one hand, the reset elastic member can be used to position the first locking member in the first mating state, ensuring that the first locking member and the second locking member can smoothly switch to the first mating state; on the other hand, after the first locking member moves relative to the lower die support structure in a direction away from the punch pad, the reset elastic member can be compressed by the first locking member, causing the reset elastic member to be in a compressed energy storage state. At this time, the reset elastic member can apply a force from the first locking member to the punch pad on the first locking member, thereby driving the first locking member to reset via the reset elastic member.

[0021] In one possible implementation, the first locking member is provided with a first guide hole that extends through the surface of the first locking member facing away from the punch backing plate. A portion of the resetting elastic member is accommodated within the first guide hole. This not only helps increase the length of the resetting elastic member, thereby increasing its elastic force, but also allows the first guide hole to define the direction of retraction and expansion of the resetting elastic member, preventing deviation in the direction of the force applied by the resetting elastic member to the first locking member and ensuring smooth resetting of the first locking member.

[0022] In one possible implementation, a second guide hole is provided on the lower plate, and a portion of the resetting elastic member is located within the second guide hole. The second guide hole extends through the inner wall of the avoidance space and the outer wall of the lower plate, and a blocking member is provided within the second guide hole. The two ends of the resetting elastic member are respectively connected to the blocking member and the first locking member.

[0023] In this way, on the one hand, it is beneficial to increase the length of the reset elastic member, thereby increasing the elastic force of the reset elastic member; on the other hand, the extension and contraction direction of the reset elastic member can be further limited by the second guide hole, which can further avoid the deviation of the direction of the force applied by the reset elastic member to the first locking member, thereby ensuring that the first locking member can be smoothly reset; on the other hand, it can also reduce the assembly difficulty of the reset elastic member, and reduce the processing difficulty of the second guide hole, which can improve the processing efficiency of the stamping and back-extrusion device.

[0024] In one possible implementation, the second locking member is provided with a first avoidance hole, which penetrates two opposing surfaces of the second locking member in the second direction and the surface of the second locking member facing the lower die support structure. In both the first and second mating states, the return spring is inserted into the first avoidance hole. This prevents the return spring from interfering with the movement of the second locking member, ensuring the normal operation of the stamping and back-extrusion processes.

[0025] In one possible implementation, the punch pad includes a first abutment surface, and in a first mating state, the first locking member abuts against the first abutment surface; wherein, in a direction from the punch body to the punch pad, the first abutment surface extends obliquely toward the center axis of the punch pad.

[0026] In this way, through the cooperation between the first locking member and the first abutting surface, there is not only a component of force extending along the first direction, but also a component of force extending along the second direction between the punch pad and the first locking member. Therefore, in the first cooperation state, the first locking member can not only limit the punch pad in the first direction, but also limit the first locking member in the second direction by the punch pad, so that the first locking member can remain relatively fixed with the lower die support structure in the first cooperation state, which can ensure the positional stability of the first locking member in the first cooperation state, thereby ensuring the positional stability of the punch assembly in the stamping process, and further ensuring the stamping effect of the stamping back-extrusion device. In addition, in the second cooperation state, the first abutting surface can also cooperate with the first locking member to push the first locking member to move along the second direction away from the punch assembly, so that the movement of the punch assembly in the back-extrusion process is more stable, which is conducive to improving the back-extrusion effect of the stamping back-extrusion device.

[0027] In one possible implementation, a punch backing plate includes a backing plate body and an abutment block. The backing plate body includes a first top surface and a first bottom surface that face each other, with the first top surface facing the punch body. The abutment block is disposed on the first bottom surface and includes a first outer wall surface facing away from the central axis of the punch backing plate, with at least a portion of the first outer wall surface constituting a first abutment surface. A specific structure of the punch backing plate is provided.

[0028] In one possible implementation, the backing plate body and the abutment block are an integrated structure. That is, the punch backing plate is an integrally formed part. This simplifies the processing of the punch backing plate.

[0029] In a possible implementation, the first abutting surface is formed between the first outer peripheral surface and the first bottom surface of the backing plate body. Another specific structure of a punch backing plate is provided.

[0030] In one possible implementation, the first locking member includes a second abutting surface configured to abut against the first abutting surface. The second abutting surface extends obliquely toward the central axis of the punch backing plate in a direction from the punch body toward the punch backing plate. This increases the contact area between the punch backing plate and the first locking member and reduces the compressive force between the first locking member and the punch backing plate.

[0031] In one possible implementation, the lower die support structure includes a stacked lower die base and a lower backing plate, with the lower backing plate positioned on a side of the lower die base proximal to the punch assembly. A clearance space is defined on the lower backing plate, extending through a surface of the lower backing plate facing away from the lower die base, with at least a portion of the first locking member positioned within the clearance space. This facilitates engagement between the first locking member and the punch backing plate, and reduces the overlapped dimension of the first locking member and the lower backing plate in a first direction, thereby facilitating a reduction in the volume of the punching and extrusion device and the space occupied by the punching and extrusion device.

[0032] In one possible implementation, the avoidance space includes a first inner wall surface and a second inner wall surface that are opposite to each other in a third direction, the third direction being perpendicular to the first direction and the second direction. The first locking member includes a first side wall surface and a second side wall surface that are opposite to each other in the third direction, the first side wall surface being configured to slide with the first inner wall surface, and the second side wall surface being configured to slide with the second inner wall surface. In this way, the first locking member can be limited in the third direction, reducing the shaking of the first locking member during the sliding process, thereby improving the smoothness of the sliding process of the first locking member.

[0033] In one possible implementation, a first step groove is provided on the first side wall, which is recessed toward the second side wall. The first step groove extends through the surface of the first locking member facing away from the lower die base. The lower plate is also provided with a second step groove, which extends through the surface of the lower plate facing away from the lower die base and through the first inner wall. The stamping and back-extrusion device further includes a first pressure block, which is fixed within the second step groove, with a portion of the first pressure block located within the first step groove. In this way, the first pressure block can limit the first locking member in the first direction, preventing the first locking member from slipping out of the avoidance space, thereby improving the positional stability of the first locking member.

[0034] In one possible implementation, the lower mold support structure includes a lower support plate, a support pad and a lower mold base, the lower support plate and the lower mold base are spaced apart along a first direction, and the support pad is fixedly connected between the lower mold base and the lower support plate; the stamping back-extrusion device also includes an elastic connection component, the elastic connection component includes a second elastic member, a connecting plate and a first push rod, the connecting plate is located between the lower support plate and the lower mold base, and the connecting plate is spaced apart from the lower support plate, and the second elastic member is connected between the lower support plate and the connecting plate.

[0035] This allows the elastic connection assembly to provide elastic support for the male mold assembly, improving its smooth movement. Furthermore, when the female mold assembly and the male mold assembly are disengaged, the elastic connection assembly can apply force to the male mold assembly, causing it to move away from the lower mold support structure for reset. Furthermore, the provision of the connecting plate facilitates increasing the number of second elastic members, thereby increasing the elastic force provided by the elastic connection assembly.

[0036] In one possible implementation, the stamping and back-extrusion device includes a flexible support mechanism, which is connected to the punch pad and is used to provide a force for the punch assembly directed from the punch pad to the punch body. The flexible support mechanism can switch between a first support state and a second support state. In the first support state, the flexible support mechanism provides a first force to the punch assembly so that the punch assembly is in a first working state; in the second support state, the flexible support mechanism provides a second force to the punch assembly so that the punch assembly is in a second working state; the component of the second force in the first direction is smaller than the component of the first force in the first direction.

[0037] In this way, by adjusting the support state of the flexible support mechanism, the force applied by the flexible support mechanism to the punch assembly can be adjusted so that the support force can meet the support force required by the punch assembly in the stamping process (e.g., 90-degree forming) and the support force required by the punch assembly in the back-extrusion process, thereby adjusting the working state of the punch assembly so that the punch assembly can switch between the first working state and the second working state. Therefore, the stamping and back-extrusion device in this embodiment also has stamping and back-extrusion functions.

[0038] In one possible implementation, the flexible support mechanism includes a drive mechanism, which is an oil pressure system or a hydraulic system. Thus, the force applied by the flexible support mechanism to the male mold assembly can be varied by changing the pressure of the oil pressure system or the hydraulic system. This results in a simple structure and ease of implementation.

[0039] In a possible implementation, the flexible supporting mechanism comprises a push plate and a third ejector rod. The push plate is located between the lower supporting plate and the lower die seat and is spaced apart from the lower supporting plate. The driving mechanism is connected between the lower supporting plate and the push plate. The two ends of the third ejector rod are connected to the connecting plate and the punch pad plate respectively. In this way, the number of the driving mechanism can be increased, so that the supporting force provided by the flexible supporting mechanism can be increased.

[0040] In a possible implementation, the stamping and back extruding device further comprises a driving device connected to the back extruding assembly and configured to drive the back extruding body to move in the first direction. In this way, the operation of the back extruding body can be ensured to be reasonable. On the one hand, in the stamping process, the driving device can be used to drive the back extruding pad to move downward relative to the punch assembly, so that a gap is formed between the back extruding body and the side plate of the workpiece to be processed, and the back extruding body can avoid interfering with the workpiece to be processed in the stamping process. On the other hand, after the concave die assembly and the punch assembly are separated, the driving device can be used to drive the back extruding pad to move upward relative to the punch assembly, so that the back extruding body can act on the side plate of the workpiece to be processed, and the workpiece to be processed can be ejected from the punch assembly, so that the back extruding body not only has the back extruding function, but also has the function of ejecting the workpiece from the punch assembly. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A structural schematic diagram of an electronic device shell is provided for some embodiments of the present application;

[0042] Figure 2 A partial perspective view of another view of the shell is shown; Figure 1

[0043] Figure 3 An enlarged view of the shell in the A region is shown; Figure 1

[0044] Figure 4 A schematic diagram of a forming process of the shell is shown; Figure 1

[0045] Figure 5 A structural schematic diagram of a stamping device is provided for some embodiments of the present application;

[0046] Figure 6 A structural schematic diagram of a back extruding device is provided for some embodiments of the present application;

[0047] Figure 7 A structural schematic diagram of a stamping and back extruding device is provided for some embodiments of the present application;

[0048] Figure 8 A sectional view of the stamping and back extruding device at the A-A line is shown; Figure 7

[0049] ​​​​ Figure 9 for Figure 7 An exploded view of the upper die support structure and the female die assembly in the punching and extrusion device shown;

[0050] Figure 10 for Figure 7 The assembly diagram of the lower die support structure, the punch assembly and the back-extrusion assembly in the punching and back-extrusion device shown;

[0051] Figure 11 for Figure 7 An exploded view of the lower die support structure, the punch assembly and the back-extrusion assembly in the punch back-extrusion device shown;

[0052] Figure 12 for Figure 7 A schematic diagram of the connection between the punch assembly and the elastic connection assembly in the punching and back-extrusion device shown;

[0053] Figure 13 for Figure 8 An enlarged view of the area B in the cross-sectional view shown;

[0054] Figure 14 for Figure 7 A cross-sectional view of the first locking member and the second locking member in the punching and back-extrusion device in a second engaged state;

[0055] Figure 15 for Figure 14 An enlarged view of the C region in the cross-sectional view shown;

[0056] Figure 16 for Figure 7 Another cross-sectional view of the punching and back-extrusion device shown;

[0057] Figure 17 for Figure 16 The cross-sectional view shown is an enlarged view of the D area;

[0058] Figure 18 for Figure 7 A schematic diagram of the cooperation between the first locking member, the second locking member and the punch backing plate in the punching and back-extrusion device shown;

[0059] Figure 19 for Figure 18 A perspective view of the punch backing plate in the illustrated matching diagram;

[0060] Figure 20 for Figure 7 A perspective view of the second locking member in the punch-back device;

[0061] Figure 21 for Figure 7 An assembly perspective view of the second locking member, the die assembly, and the upper die support structure in the punching and extrusion device shown;

[0062] Figure 22 for Figure 7 A perspective view of the first locking member in the punch-back device;

[0063] Figure 23 for Figure 7 A schematic diagram of the assembly of the first locking member and the lower die support structure in the punching and back-extrusion device shown;

[0064] Figure 24 for Figure 23 A partial exploded view of the assembly schematic shown;

[0065] Figure 25 for Figure 7 A cross-sectional view of the punching and extrusion device at line BB is shown;

[0066] Figure 26 for Figure 7 Schematic diagram of the assembly of the driving device and the back-extrusion component in the punching and back-extrusion device shown;

[0067] Figure 27 for Figure 7 A cross-sectional view of the driving device, the punch assembly, and the back-extrusion assembly in the punch back-extrusion device shown;

[0068] Figure 28 Schematic diagram of the working process of the punching and back-extrusion device in some embodiments of the present application;

[0069] Figure 29 A schematic structural diagram of a punching and back-extrusion device provided in some other embodiments of the present application;

[0070] Figure 30 Schematic diagram of the shell forming process provided for other embodiments of the present application.

[0071] Reference numerals:

[0072] Housing 100; bottom plate 101; side plate 102; R angle 103;

[0073] Plate 100a; first blank 100b; second blank 100c;

[0074] Workpiece to be stamped C1; Workpiece to be re-extruded C2;

[0075] Punching device 200;

[0076] First supporting mechanism 201; first male mold 202; first female mold 203;

[0077] Back-extrusion device 300;

[0078] Second supporting mechanism 301; second male die 302; second female die 303; back-extrusion mechanism 304; elastic structural member 305;

[0079] Punching and re-extrusion device 400;

[0080] Upper die support structure 10; upper die base 11; upper pad 12;

[0081] Concave mold assembly 20; Concave mold body 21; Assembly hole 211; Concave mold inner stripper 22;

[0082] Lower mold support structure 30; lower supporting plate 31; supporting foot 32; lower mold base 33; lower pad 34; avoidance space 342; first inner wall surface 3421; second inner wall surface 3422; second step groove 343; fourth step groove 344; second guide hole 345;

[0083] Punch assembly 40; punch body 41; punch pad 42; first abutting surface 42a; pad body 421; first top surface 4211; first bottom surface 4212; first outer peripheral surface 4213; abutment block 422; first outer wall surface 4221;

[0084] Back-extrusion assembly 50; back-extrusion pad 51; receiving hole 511; back-extrusion main body 52; second positioning structure 521; positioning bracket 53; first inner surface 53a; first outer surface 53b; first positioning structure 531; back-extrusion splint 54;

[0085] First elastic member 61; Reset elastic member 62;

[0086] Elastic connecting assembly 70; second elastic member 71; connecting plate 72; first push rod 73;

[0087] Locking assembly 80; first locking member 81; first locking surface 81a; first mating surface 81b; second abutting surface 81c; first side wall surface 811; second side wall surface 812; first step groove 814; third step groove 815; first guide hole 816;

[0088] Second locking member 82; second locking surface 82a; second mating surface 82b; fixing portion 821; fixing ear 8211; connecting rod 822; first surface 8221; protrusion 823; first connecting surface 8231; first avoidance hole 824;

[0089] First pressing block Y1; second pressing block Y2;

[0090] Driving device 401; second push rod 402; positioning column 403;

[0091] Flexible support mechanism 90; driving mechanism 91; push plate 92; third push rod 93. DETAILED DESCRIPTION

[0092] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0093] In the embodiments of the present application, the term "exemplary" or "for example" is used to indicate an example, illustration or description. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. Rather, the term "exemplary" or "for example" is used to present the relevant concept in a specific manner.

[0094] In the embodiments of the present application, the terms "first", "second" are used only for descriptive purposes, and should not be interpreted or implied to indicate or imply relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0095] In the description of the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects are in an "or" relationship.

[0096] In the embodiments of the present application, it should be understood that the mentioned positional phrases, such as "top", "bottom", "inner", "outer", "upper", "lower", etc., are only the direction of the accompanying drawings, therefore, the positional phrases used are for better, clearer illustration and understanding of the embodiments of the present application, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation to the embodiments of the present application.

[0097] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected and the relative position relationship remains unchanged after the connection. "Rotational connection" means that the two are connected and can rotate relative to each other after the connection. "Sliding connection" means that the two are connected and can slide relative to each other after the connection. "Transmission connection" means that the movement of one component can be transmitted to the other component, and the connection method between the two components includes but is not limited to at least one of the connection methods such as rotation connection, sliding connection, gear meshing transmission connection, sprocket transmission connection, and cam mechanism transmission connection. "Heat conduction connection" refers to a connection with heat transfer between two components.

[0098] In the description of the embodiments of the present application, the terms "parallel" and "perpendicular" include the described situations and situations similar to the described situations, and the range of the similar situations is within an acceptable deviation range. For example, "parallel" includes absolutely parallel and approximately parallel, and "perpendicular" includes absolutely perpendicular and approximately perpendicular, where the acceptable deviation range of approximately parallel and approximately perpendicular can be, for example, within 5°, 8°, or 10°.

[0099] In order to reduce the R angle of the housing of an electronic device while simplifying the processing steps of the housing, an embodiment of the present application provides a stamping and extrusion device. The punch assembly in the stamping and extrusion device has a first working state and a second working state, and can switch between the first working state and the second working state, so that the stamping and extrusion device has both stamping and extrusion functions. In this way, the workpiece to be processed can be stamped and extruded in the same device, which can achieve the purpose of reducing the processing steps of the housing, improving production efficiency, and reducing the cost of the device.

[0100] To facilitate understanding, before giving a detailed introduction to the stamping and back-extrusion device in the embodiment of the present application, the relevant terms involved in the embodiment of the present application are first explained.

[0101] Stamping: Stamping is a forming method that uses a press and a die to apply external force to plates, strips, pipes and profiles to cause them to undergo plastic deformation or separation, thereby obtaining a workpiece (stamping part) of the desired shape and size.

[0102] Back-squeeze: Also known as back-squeeze or punch back-squeeze, back-squeeze occurs when the edge of a workpiece experiences significant pressure and shear during the stamping process, causing plastic flow and retraction into the mold cavity. This retraction is known as back-squeeze.

[0103] Closing the mold: refers to closing the punch and die in the mold with a certain closing force.

[0104] Mold opening: refers to separating the punch and die in the mold.

[0105] Round corners: Also known as rounded corners, rounded corners are created by replacing the original corner with an arc tangent to both sides. The size of the rounded corner is expressed by the radius of the arc. For example, a 0.5mm rounded corner indicates a 0.5mm radius.

[0106] Chamfering: refers to the process of cutting the edges and corners of a workpiece into a certain slope.

[0107] 3C products: A general term for computer, communication, and consumer electronic devices, also known as "information appliances." Examples of 3C products include, but are not limited to, laptops, tablets, mobile phones, and digital audio players.

[0108] To give electronic devices like consumer electronics (3C products) a metallic appearance, they often use metal casings. Metal casing materials include, but are not limited to, aluminum alloys, magnesium alloys, and magnesium-aluminum alloys. The thickness of the metal casing can range from 0.6mm to 1.5mm. For example, the thickness of the metal casing can be 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.3mm, or 1.5mm.

[0109] See also Figure 1-Figure 2 , Figure 1 This is a schematic structural diagram of a housing 100 of an electronic device provided in some embodiments of the present application. Figure 2 for Figure 1 A partial perspective view of the housing 100 from another perspective is shown. The housing 100 includes a bottom plate 101 and side plates 102, with the side plates 102 surrounding the periphery of the bottom plate 101. The side plates 102 can be arranged perpendicular to the bottom plate 101. That is, the angle between the side plates 102 and the bottom plate 101 is 90 degrees.

[0110] See also Figure 3 , Figure 3 for Figure 1 An enlarged view of area A of housing 100 is shown. An R-angle 103 is formed between side panel 102 and bottom panel 101. To enhance the sophistication of the electronic device, R-angle 103 is preferably as small as possible. In some embodiments, R-angle 103 is less than or equal to 0.5 mm.

[0111] See also Figure 4 , Figure 4 for Figure 1 A schematic diagram of a forming process of the housing 100 is shown. Figure 4As shown in (a) of FIG. 1 , the housing 100 can be formed by processing a sheet material 100a. In order to reduce the R angle 103, the housing 100 is usually formed by a stamping process combined with a back-extrusion process. Specifically, as shown in FIG. Figure 4 As shown in (b), the processing method of the housing 100 includes:

[0112] Step S1a: providing a sheet-shaped plate 100a;

[0113] The plate 100a is a metal member. For example, the material of the plate 100a includes but is not limited to aluminum alloy, magnesium alloy, magnesium-aluminum alloy, etc.

[0114] Step S2a: performing a first stamping process on the plate 100a, bending the edge areas of the plate 100a to form side panels 102, and the middle area of ​​the plate 100a to form the bottom panel 101, and making the angle α between the side panels 102 and the bottom panel 101 a first angle, thereby obtaining a first blank 100b; wherein the first angle is less than 90°;

[0115] For example, the first angle may be 60°, 70°, 75°, etc.

[0116] Step S3a: performing a second stamping process on the first blank 100b so that the angle α between the side plate 102 and the bottom plate 101 is 90°, thereby obtaining a second blank 100c.

[0117] See also Figure 5 , Figure 5 A schematic structural diagram of a stamping device 200 provided for some embodiments of the present application. Step S2a or step S3a can be processed using the stamping device 200. Specifically, the stamping device 200 includes a first supporting mechanism 201, a first punch 202 and a first die 203. The first punch 202 is relatively fixed to the first supporting mechanism 201. That is, the first supporting mechanism 201 forms a rigid support for the first punch 202. The first die 203 can move relative to the first supporting mechanism 201 along the first direction e1 (that is, the up and down direction). During the stamping process, the workpiece C1 to be stamped (such as a plate 100a, a first blank 100b, etc.) can be placed on the first punch 202 first, and then the first die 203 can be moved downward to perform a stamping process (also referred to as a bending process) on the workpiece C1 to be stamped.

[0118] In the first blank 100b and the second blank 100c, the R angle 103 between the side plate 102 and the bottom plate 101 is a natural R angle 103 formed by bending. The natural R angle 103 is greater than or equal to the thickness of the plate 100a. However, in order to ensure the structural strength of the housing 100, the thickness of the plate 100a cannot be set to be smaller. Therefore, the natural R angle 103 is usually larger, which greatly damages the appearance of the housing 100 and thus affects the appearance of the entire electronic device, failing to meet market demand. On this basis, in order to reduce the R angle 103, please continue to refer to Figure 4 In (b), the processing method of the housing 100 further includes:

[0119] Step S4a: performing back-extrusion processing on the second blank 100c.

[0120] Specifically, the side panel 102 can be squeezed back along the direction of the arrow shown by the dotted line, and the squeezing dimension is H.

[0121] See also Figure 6 , Figure 6 Schematic diagram of the structure of the back-extrusion device 300 provided in some embodiments of the present application. Step S4a can be processed using the back-extrusion device 300. Specifically, the back-extrusion device 300 includes a second support mechanism 301, a second punch 302, a second die 303, and a back-extrusion mechanism 304. The second punch 302 is elastically connected to the second support mechanism 301 through an elastic structural member 305, and the second die 303 and the second punch 302 can both move in the up and down directions relative to the first support mechanism 201. The back-extrusion mechanism 304 surrounds the outer periphery of the second punch 302 and is fixed relative to the second support mechanism 301.

[0122] During the back-extrusion process, the workpiece C2 to be back-extruded (e.g., the second blank 100c) is first placed on the second punch 302, and then the second die 303 is moved downward until the die is closed. The second die 303 and the second punch 302 are then moved downward as a whole, and the back-extrusion mechanism 304 squeezes the side panel 102 of the workpiece C2 to be back-extruded, so that the material in the side panel 102 fills the corner R 103, thereby reducing the corner R 103.

[0123] In this way, the R angle 103 between the side plate 102 and the bottom plate 101 can be reduced to less than or equal to 0.5 mm, which can improve the appearance of the housing 100 and the electronic device and ensure the overall structural strength of the housing 100 and the electronic device.

[0124] However, to ensure the force between the first die 203 and the first punch 202 during the stamping process (i.e., steps S2a and S3a), the first punch 202 and the first support mechanism 201 in the stamping device 200 must be rigidly fixed. In other words, there is no relative movement between the first punch 202 and the first support mechanism 201. To ensure the force between the back-extrusion mechanism 304 and the side panel 102 and the relative movement between the side panel 102 and the back-extrusion mechanism 304 during the back-extrusion process (step S4a), the second punch 302 in the back-extrusion device 300 must be elastically connected to the second support mechanism 301.

[0125] Specifically, because the movement stroke of the first die 203 during the stamping process differs from the movement stroke of the second die 303 during the back-extrusion process, the connection relationship between the first punch 202 and the first support mechanism 201 and the connection relationship between the second punch 302 and the second support mechanism 301 cannot be unified. Therefore, the stamping process and the back-extrusion process must be performed on different devices. In addition, because the bending angles of the first and second stamping processes are different, they must also be performed on different stamping devices. As a result, the processing of the housing 100 needs to be carried out on three different devices.

[0126] While this machining method can reduce the radius (R) angle 103 of housing 100, due to the limitations of the apparatus structure, it requires three sets of apparatus and four steps to complete the machining of housing 100. This results in multiple steps, low production efficiency, and high equipment costs. Furthermore, during the machining process, the workpiece to be machined must be transferred between different apparatuses, which can easily cause scratches or bumps on the workpiece during transfer, significantly reducing the production yield of housing 100.

[0127] To solve the above technical problems, please refer to Figure 7-Figure 8 , Figure 7 This is a schematic structural diagram of a punching and back-extrusion device 400 provided in some embodiments of the present application. Figure 8 for Figure 7 The punching and extrusion device 400 is shown in a cross-sectional view along line AA. The punching and extrusion device 400 includes an upper die support structure 10 , a female die assembly 20 , a lower die support structure 30 , a male die assembly 40 and an extrusion assembly 50 .

[0128] It should be noted that Figure 7 and Figure 8 Only some components of the punching and back-extrusion device 400 are schematically shown, and the actual shape, actual size, actual position and actual structure of these components are not affected by the present invention. Figure 7 and Figure 8 limitation.

[0129] The upper die support structure 10 is used to provide a mounting base for the die assembly 20 and other components. Figure 9, Figure 9 for Figure 7 An exploded view of the upper die support structure 10 and the die assembly 20 in the punching and back-extrusion device 400 is shown. The upper die support structure 10 includes an upper die base 11 and an upper pad 12. Both the upper die base 11 and the upper pad 12 can be plate-shaped. Exemplarily, the upper die base 11 and the upper pad 12 can be rectangular plates. The upper die base 11 and the upper pad 12 are stacked in a first direction e1. The first direction e1 can be parallel to the thickness direction of the upper pad 12. For example, the upper pad 12 can be fixedly connected to the bottom of the upper die base 11.

[0130] In some embodiments, the upper die base 11 and the upper plate 12 can be fixed together by fasteners, welding, clamping, etc. The fasteners include but are not limited to screws, pins, bolts, etc. Alternatively, the upper die base 11 and the upper plate 12 can be integrally formed.

[0131] See also Figure 8 Combined with Figure 9 The die assembly 20 includes a die body 21 and a die inner stripper 22. The die body 21 is plate-shaped and has an assembly hole 211. The assembly hole 211 penetrates the two opposite surfaces of the die body 21 in the first direction e1 to form a through hole. Figure 8 The die body 21 is fixedly connected to the upper plate 12 and is located on the side of the upper plate 12 facing away from the upper die holder 11. In other words, the die body 21 is located on the lower side of the upper plate 12. For example, the die body 21 and the upper plate 12 can be fixed by fasteners, welding, etc.

[0132] In some embodiments, in order to improve the assembly efficiency of the stamping and back-extrusion device 400, fasteners can be passed through the upper die base 11, the upper pad 12 and the die body 21 in sequence to fix the upper die base 11, the upper pad 12 and the die body 21 into a whole.

[0133] The inner stripper 22 of the die is arranged in the assembly hole 211. The inner stripper 22 of the die is used to cooperate with the punch assembly 40 to form a mold cavity to clamp the workpiece to be processed. The inner stripper 22 of the die and the die body 21 can move relative to each other along the first direction e1. Exemplarily, the stamping and back-extrusion device 400 also includes a first elastic member 61, and the first elastic member 61 is connected between the upper die base 11 and the inner stripper 22 of the die. The first elastic member 61 includes but is not limited to a nitrogen spring, a coil spring, a rubber, etc. That is, the inner stripper 22 of the die is elastically connected to the upper die base 11 through the first elastic member 61.

[0134] The lower die support structure 30 provides a mounting base for the punch assembly 40, the back-extrusion assembly 50, and the like. The lower die support structure 30 is spaced apart from the upper die support structure 10 in a first direction e1, and the lower die support structure 30 and the upper die support structure 10 are relatively movable in the first direction e1. Specifically, the lower die support structure 30 is located below the upper die support structure 10.

[0135] See also Figure 10-11 , Figure 10 for Figure 7 The assembly diagram of the lower die support structure 30, the punch assembly 40 and the back-extrusion assembly 50 in the punching and back-extrusion device 400 is shown. Figure 11 for Figure 7 An exploded view of the lower die support structure 30 , the punch assembly 40 and the back-extrusion assembly 50 in the punching and back-extrusion device 400 is shown.

[0136] The lower mold support structure 30 includes a lower support plate 31, support feet 32, a lower mold base 33, and a lower pad 34. The lower support plate 31 and the lower mold base 33 are both plate-shaped. Exemplarily, the lower support plate 31 and the lower mold base 33 are both rectangular plates. The lower support plate 31 and the lower mold base 33 are spaced apart along the first direction e1, and the support feet 32 ​​are fixedly connected between the lower mold base 33 and the lower support plate 31. Exemplarily, the lower mold base 33 is located above the lower support plate 31. There may be multiple support feet 32, and the multiple support feet 32 ​​are spaced apart.

[0137] The support legs 32 and the lower support plate 31 can be connected by fasteners, welding, bonding, or other methods. Alternatively, the support legs 32 and the lower support plate 31 can be integrally formed. The connection between the support legs 32 and the lower die base 33 can be designed with reference to the connection between the support legs 32 and the lower support plate 31.

[0138] The lower pad 34 is stacked with the lower die base 33, and the lower pad 34 is located on the side of the lower die base 33 away from the lower supporting plate 31. For example, the lower pad 34 can be located above the lower die base 33. The lower pad 34 and the lower die base 33 can be connected by fasteners.

[0139] The male mold assembly 40 is disposed on the lower mold support structure 30. For details, please refer to Figure 11 The punch assembly 40 includes a punch body 41 and a punch backing plate 42 stacked in a first direction e1. The punch body 41 is located on a side of the punch backing plate 42 facing away from the lower die holder 33. For example, the punch body 41 is located on the upper side of the punch backing plate 42. The punch body 41 and the punch backing plate 42 can be connected by fasteners.

[0140] Specifically, the male mold assembly 40 is elastically connected to the lower mold support structure 30. Figure 8, the stamping and back-extrusion device 400 also includes an elastic connecting component 70. The elastic connecting component 70 includes a second elastic member 71, a connecting plate 72 and a first push rod 73. The connecting plate 72 is located between the lower support plate 31 and the lower die base 33, and the connecting plate 72 is spaced apart from the lower support plate 31. The second elastic member 71 is connected between the lower support plate 31 and the connecting plate 72. Exemplarily, one end of the second elastic member 71 can be fixedly connected to the lower support plate 31, and the other end of the second elastic member 71 is connected to the connecting plate 72. The second elastic member 71 includes but is not limited to a nitrogen spring, a coil spring, and a rubber.

[0141] In order to ensure the movement of the male mold assembly 40 relative to the lower mold support structure 30 in the first direction e1, please refer to Figure 8 When the connecting plate 72 abuts the lower die base 33, the punch pad 42 and the lower plate 34 are spaced apart in the first direction e1. That is, when the connecting plate 72 abuts the lower die base 33, a gap exists between the punch pad 42 and the lower plate 34 in the first direction e1. In this case, the second elastic member 71 can be in a naturally extended or compressed state. This allows for a certain amount of movement between the punch pad 42 and the lower plate 34 for the punch assembly 40, ensuring that the punch assembly 40 can move along the first direction e1 toward the lower die support structure 30.

[0142] See also Figure 12 , Figure 12 for Figure 7 The diagram shows the connection between the punch assembly 40 and the elastic connection assembly 70 in the punching and back-extrusion device 400. The two ends of the first push rod 73 are fixedly connected to the connecting plate 72 and the punch pad 42 respectively. In order to achieve the connection between the first push rod 73 and the punch pad 42, a first through hole can be provided on the lower die base 33, and a second through hole can be provided on the lower pad 34, and the second through hole is opposite to and connected to the first through hole. The first push rod 73 is inserted into the first through hole and the second through hole. On this basis, in order to improve the force uniformity of the punch assembly 40, a plurality of first push rods 73 can be provided.

[0143] In this way, the elastic force of the second elastic member 71 can be transmitted to the punch assembly 40 through the connecting plate 72 and the first top rod 73. When the punch assembly 40 moves towards the lower die support structure 30 along the first direction e1, the second elastic member 71 is compressed, and the second elastic member 71 can exert a force on the connecting plate 72 directed towards the punch assembly 40. On the one hand, the punch assembly 40 can be provided with elastic support, which can improve the movement stability of the punch assembly 40. On the other hand, when the concave die assembly 20 and the punch assembly 40 are disengaged, the elastic connecting assembly 70 can exert a force on the punch assembly 40 to move the punch assembly 40 away from the lower die support structure 30 to reset. In addition, the arrangement of the connecting plate 72 is also conducive to increasing the number of second elastic members 71, thereby increasing the elastic force that can be provided by the elastic connecting assembly 70.

[0144] In some embodiments, in order to facilitate positioning of the workpiece to be processed and improve the positioning accuracy of the workpiece, please refer to Figure 12 The stamping back extrusion device 400 further comprises a positioning column 403 protruding from the surface of the punch body 41 away from the punch backing plate 42.

[0145] The back extrusion assembly 50 is used for back extrusion forming processing of the workpiece to be processed. Please refer to Figure 10-11 The back extrusion assembly 50 comprises a back extrusion backing plate 51, a back extrusion main body 52, a positioning bracket 53 and a back extrusion clamping plate 54. The back extrusion backing plate 51 is arranged on the side of the lower backing plate 34 away from the lower die seat 33. Specifically, the back extrusion backing plate 51 can be arranged on the upper side of the lower backing plate 34.

[0146] Please refer to Figure 11 The back extrusion backing plate 51 is provided with a receiving hole 511. The receiving hole 511 is a through hole. That is, the receiving hole 511 penetrates through the two side surfaces of the back extrusion backing plate 51 in the first direction e1. The orthographic projection of the punch assembly 40 on the first reference plane is located within the orthographic projection of the receiving hole 511 on the first reference plane. In this way, interference between the back extrusion backing plate 51 and the punch assembly 40 can be avoided, and the relative movement between the punch assembly 40 and the lower die support structure 30 can be ensured.

[0147] Please refer to Figure 10 and in combination with Figure 11 The back extrusion main body 52 is annular and surrounds the outer periphery of the punch assembly 40. For example, the inner peripheral surface of the back extrusion main body 52 can be attached to the outer peripheral surface of the punch assembly 40. The back extrusion main body 52 is supported on the back extrusion backing plate 51. The back extrusion main body 52 can be a whole structure or can be formed by splicing a plurality of back extrusion segments.

[0148] The positioning bracket 53 is used to position the installation position of the back-extrusion main body 52. ​​The positioning bracket 53 is fixedly connected to the back-extrusion pad 51 and is located on the circumferential outer side of the back-extrusion main body 52. ​​For details, please refer to Figure 11 The positioning bracket 53 includes a first inner surface 53a and a first outer surface 53b that are opposite to each other. The first inner surface 53a faces the back-extrusion main body 52.

[0149] In some embodiments, the positioning bracket 53 is detachably connected to the back-extrusion pad 51. For example, the positioning bracket 53 and the back-extrusion pad 51 can be secured by fasteners. The positioning bracket 53 can be a single integral structural member or comprise multiple sub-brackets. Adjacent sub-brackets within the multiple sub-brackets can be spaced apart circumferentially around the back-extrusion main member 52 or spliced ​​together.

[0150] See also Figure 11 The positioning bracket 53 is provided with a first positioning structure 531, and the back-extrusion main body 52 is provided with a second positioning structure 521 for cooperating with the first positioning structure 531. For example, please refer to Figure 11 , the first positioning structure 531 includes a positioning groove. The positioning groove is formed by the first inner surface 53a being recessed toward the first outer surface 53b. The second positioning structure 521 includes a positioning protrusion, and the positioning protrusion protrudes from the outer wall surface of the back-extrusion main body 52. ​​It can be understood that in other embodiments, the first positioning structure 531 can also include positioning holes, positioning notches, positioning protrusions, etc. In this way, through the cooperation of the first positioning structure 531 and the second positioning structure 521, the installation position of the back-extrusion main body 52 can be positioned, which can improve the assembly position accuracy of the back-extrusion main body 52 and reduce the assembly difficulty of the back-extrusion main body 52.

[0151] The back-squeezing clamping plate 54 is annular. The back-squeezing clamping plate 54 is fixedly connected to the back-squeezing pad 51 and is sleeved on the outside of the positioning bracket 53. The back-squeezing clamping plate 54 and the back-squeezing pad 51 can be connected by fasteners.

[0152] In some embodiments, to guide the relative movement between the lower die support structure 30 and the upper die support structure 10, the stamping and back-extrusion device 400 may further include a guide assembly to limit the relative movement direction between the lower die support structure 30 and the upper die support structure 10. For example, the guide assembly may include a guide post and a guide sleeve. The guide post may be disposed on the back-extrusion clamping plate 54, and the guide sleeve may be disposed on the die body 21.

[0153] In order to enable the punch-back extrusion device 400 to perform the punching and back extrusion on the workpiece, the punch assembly 40 has a first working state and a second working state, and can switch between the first working state and the second working state. In the first working state, the punch assembly 40 is relatively fixed with the lower die support structure 30 in the first direction e1, and at this time, the punch assembly 40 can cooperate with the concave die assembly 20 to perform the punching on the workpiece. In the second working state, the punch assembly 40 can move relative to the lower die support structure 30 along the first direction e1. For example, the punch assembly 40 can move towards the lower die support structure 30, and at this time, the back extrusion assembly 50 can extrude the side plate 102 of the workpiece to perform the back extrusion on the workpiece.

[0154] The punch-back extrusion device 400 in the embodiments of the present application has the punching function and the back extrusion function due to the fact that the punch assembly 40 has the first working state and the second working state and can switch between the first working state and the second working state. In this way, after the workpiece is punched by the punch-back extrusion device 400, the punch-back extrusion device 400 can continue to perform the back extrusion on the punched workpiece to obtain the product such as the shell 100. That is, the punching process and the back extrusion process can be performed on the same device, and therefore, after the workpiece is punched, it is not necessary to transfer the workpiece between different devices, which on the one hand can simplify the machining process of the shell 100, improve the production efficiency, and reduce the cost of the device and the production cost, and on the other hand, can also avoid the damage such as scratching and bumping caused by the transfer of the workpiece between different devices, and can effectively improve the production yield of the shell 100.

[0155] Specifically, in some embodiments, please refer to Figure 13 , Figure 13 for Figure 8 the enlarged view of the area B in the sectional view. The punch-back extrusion device 400 further comprises a locking assembly 80, and the locking assembly 80 comprises a first locking member 81 and a second locking member 82, and the first locking member 81 and the second locking member 82 have a first cooperation state and a second cooperation state. Figure 13 The locking assembly 80 in the first cooperation state.

[0156] As shown in Figure 13 , in the first cooperation state, the first locking member 81 abuts against the punch backing plate 42 to limit the movement of the punch backing plate 42 towards the lower die support structure 30. In this state, the punch assembly 40 and the lower die support structure 30 can be relatively fixed in the first direction e1, that is, the punch assembly 40 is in the first working state, and the lower die support structure 30 can rigidly support the punch assembly 40, so that the punch assembly 40 can cooperate with the concave die assembly 20 to perform the punching on the workpiece.

[0157] See also Figure 14-15 , Figure 14 for Figure 7 The cross-sectional view of the first locking member 81 and the second locking member 82 in the punching and squeezing device 400 is in the second mating state, Figure 15 for Figure 14 An enlarged view of the section C in the cross-sectional view is shown. In the second engaged state, the first locking member 81 can move relative to the punch assembly 40 in the second direction e2, allowing the punch assembly 40 to move relative to the lower die support structure 30 in the first direction e1; the second direction e2 is perpendicular to the first direction e1. In other words, in the second engaged state, the first locking member 81 releases the restraint on the punch backing plate 42, and the punch assembly 40 enters the second operating state. Therefore, in this state, the punch assembly 40 can move toward the lower die support structure 30 along with the die assembly 20, allowing the back-extrusion body 52 to engage the workpiece to be processed, achieving back-extrusion processing of the workpiece.

[0158] In this way, the working state of the punch assembly 40 can be adjusted by adjusting the matching state of the first locking member 81 and the second locking member 82, so that the punch assembly 40 can switch between the first working state and the second working state, thereby enabling the stamping and back-extrusion device 400 to have stamping function and back-extrusion function.

[0159] In some embodiments, there may be multiple first locking members 81. Multiple first locking members 81 are spaced apart circumferentially around the punch backing plate 42. For example, there may be two, three, four, five, or more first locking members 81. The number of second locking members 82 is the same as the number of first locking members 81. This helps improve the uniformity of force applied to the punch backing plate 42. Of course, the number of first locking members 81 is not limited to this. In other embodiments, there may also be one first locking member 81.

[0160] In some embodiments, the second locking member 82 is movable relative to the lower mold support structure 30 in a first direction e1, so that the first locking member 81 and the second locking member 82 can switch between a first mating state and a second mating state. For example, in some embodiments, when the second locking member 82 moves toward the lower mold support structure 30 in the first direction e1, the first locking member 81 and the second locking member 82 can switch from the first mating state to the second mating state, and when the second locking member 82 moves away from the lower mold support structure 30 in the first direction e1, the first locking member 81 and the second locking member 82 can switch from the second mating state to the first mating state. For another example, in other embodiments, when the second locking member 82 moves away from the lower mold support structure 30 in the first direction e1, the first locking member 81 and the second locking member 82 can switch from the first mating state to the second mating state, and when the second locking member 82 moves toward the lower mold support structure 30 in the first direction e1, the first locking member 81 and the second locking member 82 can switch from the second mating state to the first mating state.

[0161] In this way, the second locking member 82 can be driven to move relative to the first locking member 81 along the first direction e1 to achieve switching between different matching states of the first locking member 81 and the second locking member 82, which is beneficial to simplifying the structure of the stamping and back-extrusion device 400.

[0162] It can be understood that in other embodiments, the first locking member 81 and the second locking member 82 can also be switched between different mating states by moving the second locking member 82 relative to the lower mold support structure 30 along other directions (such as the second direction e2 and the third direction e3 mentioned below).

[0163] In order to further simplify the structure of the punching and squeezing device 400, please refer to Figure 13-15 , the second locking member 82 is relatively fixed to the die body 21. The second locking member 82 can be located on the circumferential outside of the stripper 22 in the die. Exemplarily, the second locking member 82 can be fixedly connected to at least one of the die body 21, the upper pad 12 and the upper die base 11 by fasteners or the like. In this way, when the die body 21 moves relative to the lower die support structure 30 along the first direction e1, the second locking member 82 can move synchronously with the die body 21, thereby realizing the switching of the first locking member 81 and the second locking member 82 between the first mating state and the second mating state, and there is no need to additionally set up a driving member for driving the second locking member 82 to move, which can simplify the structure of the stamping and extrusion device 400 and reduce the cost of the stamping and extrusion device 400.

[0164] See also Figure 13The first locking member 81 includes a first locking surface 81a. In the first mating state, the second locking member 82 is located on a side of the first locking member 81 away from the central axis of the punch pad 42. The first locking surface 81a can face away from the punch assembly 40. In this state, the second locking member 82 abuts against the first locking surface 81a. Figure 15 In the second engagement state, the second locking member 82 is disengaged from the first locking surface 81a. The first locking surface 81a is a plane and parallel to the first direction e1. Furthermore, the first locking surface 81a may be perpendicular to the second direction e2.

[0165] In this way, by setting the first locking surface 81a, when the stamping back-extrusion device 400 performs the stamping process, on the one hand, the first locking surface 81a can be prevented from interfering with the movement of the second locking member 82 toward the lower die support structure 30, thereby preventing the first locking surface 81a from interfering with the movement of the die body 21 toward the lower die support structure 30; on the other hand, it can also ensure that the second locking member 82 and the first locking surface 81a can always remain in contact with each other during the entire stamping process, so that the first locking member 81 and the second locking member 82 can maintain the first matching state during the entire stamping process, and then the punch assembly 40 can be limited by the cooperation of the first locking member 81 and the punch pad 42 during the stamping process, so that the punch pad 42 and the lower die support structure 30 remain relatively fixed; on the other hand, it can also ensure that the first locking member 81 and the second locking member 82 can switch smoothly between the first matching state and the second matching state, with a simple structure and ingenious design.

[0166] For further information, please refer to Figure 13 and Figure 15 The second locking member 82 includes a second locking surface 82a, and the second locking surface 82a is a plane. The second locking surface 82a is parallel to the first locking surface 81a. Specifically, the second locking surface 82a can face the punch assembly 40. In the first mating state, the first locking surface 81a and the second locking surface 82a are in abutment with each other. In this way, in the first mating state, the second locking surface 82a can be in abutment with the first locking surface 81a, which can increase the contact area between the first locking member 81 and the second locking member 82 in the stamping process, reduce the extrusion force between the first locking member 81 and the second locking member 82, and thus improve the structural strength of the first locking member 81 and the second locking member 82.

[0167] It is understood that in other embodiments, the second locking surface 82a may be provided only on the second locking member 82, without providing the first locking surface 81a on the first locking member 81. In this case, in the first engaged state, other structures of the first locking member 81 may abut against the second locking surface 82a. Alternatively, in still other embodiments, the first locking surface 81a may be provided only on the first locking member 81, without providing the second locking surface 82a on the second locking member 82.

[0168] Based on any of the above examples, please continue to refer to Figure 13 and Figure 15 The first locking member 81 includes a first mating surface 81b, and the second locking member 82 includes a second mating surface 82b. In the second mating state, the first mating surface 81b abuts the second mating surface 82b. The first mating surface 81b extends obliquely toward the central axis of the punch backing plate 42 in the direction from the punch body 41 to the punch backing plate 72. The shape of the second mating surface 82b can be adapted to that of the first mating surface 81b.

[0169] Specifically, in some embodiments, in the first direction e1, the first mating surface 81b is located on the side of the first locking surface 81a close to the lower mold support structure 30, and in the second direction e2, the first mating surface 81b is located on the side of the first locking surface 81a close to the punch assembly 40.

[0170] See also Figure 16-17 , Figure 16 for Figure 7 Another cross-sectional view of the punching and back-extrusion device 400 is shown, Figure 17 for Figure 16 The cross-sectional view shown is an enlarged view of the D area. Figure 17 In the schematic diagram shown, the first locking member 81 and the second locking member 82 are in a critical state where the second locking member 82 has just disengaged from the first locking surface 81a. In this state, when the male mold assembly 40 moves toward the lower mold support structure 30 in the first direction e1 under the action of the female mold assembly 20, the first mating surface 81b can mate with the second mating surface 82b.

[0171] In this way, in the second mating state, the first locking member 81 and the second locking member 82 can cooperate through the first mating surface 81b and the second mating surface 82b. On the one hand, it is beneficial to improve the smoothness of the movement of the first locking member 81 along the second direction e2. On the other hand, when the second locking member 82 moves upward relative to the lower mold support structure 30, it can also push the first locking member 81 to move along the second direction e2 toward the punch pad 42 through the cooperation of the first mating surface 81b and the second mating surface 82b, which is beneficial to the reset of the first locking member 81 and ensure that the stamping and back-extrusion device 400 can be smoothly switched under different processes.

[0172] In some embodiments, see Figure 17 The first mating surface 81b is connected to the first locking surface 81a. The second mating surface 82b is connected to the second locking surface 82a. In this way, after the second locking member 82 is disengaged from the first locking surface 81a, the first mating surface 81b can be mated with the second mating surface 82b, enabling seamless switching between the first mating state and the second mating state of the first locking member 81 and the second locking member 82. This enables seamless switching between the stamping process and the re-extrusion process of the stamping and re-extrusion device 400, which is conducive to improving the working efficiency of the stamping and re-extrusion device 400.

[0173] Please return to Figure 13 The punch backing plate 42 includes a first abutting surface 42a, which is configured to abut and engage with the first locking member 81. In a first engaged state, the first locking member 81 abuts the first abutting surface 42a. The first abutting surface 42a extends obliquely toward the central axis of the punch backing plate 42 in a direction from the punch body 41 to the punch backing plate 42. In other words, the first abutting surface 42a is an inclined surface.

[0174] In this way, through the cooperation between the first locking member 81 and the first abutting surface 42a, there is not only a component of force extending along the first direction e1 but also a component of force extending along the second direction e2 between the punch pad 42 and the first locking member 81. Therefore, not only can the punch pad 42 be limited in the first direction e1 by the first locking member 81 in the first cooperation state, but the first locking member 81 can also be limited in the second direction e2 by the punch pad 42, so that the first locking member 81 can remain relatively fixed in the mold support structure 30 in the first cooperation state, thereby ensuring the position stability of the first locking member 81 in the first cooperation state, thereby ensuring the position stability of the punch assembly 40 in the stamping process, and further ensuring the stamping effect of the stamping back-extrusion device 400.

[0175] In addition, by setting the first abutting surface 42a, in the second mating state, the first abutting surface 42a can cooperate with the first locking member 81 to push the first locking member 81 to move along the second direction e2 toward the direction away from the punch assembly 40, so that the movement of the punch assembly 40 in the back-extrusion process is more stable, which is beneficial to improving the back-extrusion effect of the stamping back-extrusion device 400.

[0176] On the basis of any of the above embodiments, in order to increase the contact area between the punch plate 42 and the first locking member 81 and reduce the extrusion force between the first locking member 81 and the punch plate 42, please refer to Figure 13 and Figure 15The first locking member 81 further includes a second abutting surface 81c, which is configured to abut and cooperate with the first abutting surface 42a. Specifically, the second abutting surface 81c is an inclined surface, and extends obliquely toward the central axis of the punch backing plate 42 in the direction from the punch body 41 to the punch backing plate 42.

[0177] For further information, see Figure 13 、 Figure 15 and Figure 17 The stamping and re-extrusion device 400 further includes a reset elastic member 62, which is located on the side of the first locking member 81 facing away from the central axis of the punch pad 42. In the first mating state, the reset elastic member 62 is in a naturally extended state. In this way, on the one hand, the reset elastic member 62 can be used to position the first locking member 81 in the first mating state, ensuring that the first locking member 81 and the second locking member 82 can smoothly switch to the first mating state; on the other hand, after the first locking member 81 moves relative to the lower die support structure 30 in a direction away from the punch pad 42, the reset elastic member 62 can be compressed by the first locking member 81, so that the reset elastic member 62 is in a compressed energy storage state. At this time, the reset elastic member 62 can apply a force from the first locking member 81 to the punch pad 42 on the first locking member 81, thereby driving the first locking member 81 to reset through the reset elastic member 62.

[0178] The specific structures of the punch pad 42 and the locking assembly 80 in the embodiment of the present application are described below.

[0179] See also Figure 18-19 , Figure 18 for Figure 7 The diagram of the cooperation between the first locking member 81, the second locking member 82 and the punch pad 42 in the punching and back-extrusion device 400 is shown. Figure 19 for Figure 18 The three-dimensional diagram of the punch pad 42 in the matching schematic diagram is shown. The punch pad 42 includes a pad body 421 and abutment blocks 422. The number of abutment blocks 422 can be the same as the number of first locking members 81.

[0180] For details, please refer to Figure 19 The backing plate body 421 can be plate-shaped. The backing plate body 421 includes a first top surface 4211 and a first bottom surface 4212 that face each other, and a first outer peripheral surface 4213 connected between the first top surface 4211 and the first bottom surface 4212. The first top surface 4211 can face the male mold body 41. The abutment block 422 is disposed on the first bottom surface 4212. For example, the abutment block 422 can protrude from the first bottom surface 4212.

[0181] The abutment block 422 includes a first outer wall surface 4221 facing away from the central axis O of the punch backing plate 42. The first abutment surface 42a is formed on the first outer wall surface 4221. That is, at least a portion of the first outer wall surface 4221 can constitute the first abutment surface 42a. Specifically, the first abutment surface 42a can be formed entirely or only in part by the first outer wall surface 4221.

[0182] In some embodiments, the abutment block 422 and the pad body 421 are integrally formed. This simplifies the processing of the punch pad 42 and helps improve the connection reliability between the abutment block 422 and the pad body 421. Of course, the embodiments of the present application are not limited thereto. In other embodiments, the abutment block 422 and the pad body 421 may be separate components. In this case, the abutment block 422 and the pad body 421 may be secured together by welding, bonding, fasteners, or the like.

[0183] It is understood that, in other embodiments, the first abutting surface 42a may also be formed between the first outer peripheral surface 4213 and the first bottom surface 4212 of the backing plate body 421. In this case, the punch backing plate 42 may not include the abutting block 422.

[0184] See also Figure 20-21 , Figure 20 for Figure 7 A perspective view of the second locking member 82 in the punching and squeezing device 400 is shown, Figure 21 for Figure 7 The illustrated assembly perspective view of the second locking member 82, the die assembly 20, and the upper die support structure 10 in the punching and extrusion device 400. The second locking member 82 includes a fixing portion 821, a connecting rod 822, and a protruding portion 823. The fixing portion 821 is used to connect to the die body 21. The fixing portion 821 is fixedly connected to one end of the connecting rod 822, and the fixing portion 821 protrudes from the outer circumference of the connecting rod 822 to form a fixing ear 8211. The fixing ear 8211 can be used to fix the second locking member 82 to the upper die support structure 10 or the die body 21.

[0185] The connecting rod 822 includes a first surface 8221. When the first locking member 81 and the second locking member 82 are in the first and second mating states, the first surface 8221 faces the punch plate 42. The raised portion 823 is connected to and protrudes from the first surface 8221. The second locking surface 82a is located on the end surface of the raised portion 823 facing away from the connecting rod 822.

[0186] In order to facilitate the cooperation between the second locking member 82 and the first locking member 81, please refer to Figure 21 , the protrusion 823 is exposed outside the die body 21.

[0187] For further information, please refer to Figure 20 The raised portion 823 includes a first connecting surface 8231, which is connected between the end surface of the raised portion 823 facing away from the connecting rod 822 and the first surface 8221. The second mating surface 82b is located on the first connecting surface 8231. Specifically, the first connecting surface 8231 is located on the side of the second locking surface 82a that is closer to the fixing portion 821. In both the first and second mating states, the first connecting surface 8231 faces away from the lower mold support structure 30.

[0188] See also Figure 22 , Figure 22 for Figure 7 A three-dimensional view of the first locking member 81 in the punching and back-extrusion device 400 is shown. The first locking member 81 can be generally block-shaped. The second abutment surface 81c can be formed between two adjacent side surfaces of the first locking member 81. For example, the second abutment surface 81c can be formed by chamfering the corners of the first locking member 81. The structure is simple and easy to manufacture.

[0189] In some embodiments, see Figure 23-24 , Figure 23 for Figure 7 The schematic diagram of the assembly of the first locking member 81 and the lower die support structure 30 in the punching and back-extrusion device 400 is shown. Figure 24 for Figure 23 The assembly diagram is partially exploded. A clearance space 342 is defined on the lower plate 34. The clearance space 342 extends through the surface of the lower plate 34 facing away from the lower die base 33. At least a portion of the first locking member 81 is disposed within the clearance space 342. Specifically, a portion of the first locking member 81 may be disposed within the clearance space 342, or the entire first locking member 81 may be disposed within the clearance space 342.

[0190] The escape space 342 can extend through two opposing surfaces of the lower plate 34 in the first direction e1. In other words, the escape space 342 is a through-hole. This facilitates the fit between the first locking member 81 and the punch plate 42 and reduces the overlap between the first locking member 81 and the lower plate 34 in the first direction e1, thereby reducing the volume of the punching and extrusion device 400 and the space it occupies.

[0191] It is understood that in other embodiments, the avoidance space 342 may also only extend through the surface of the lower plate 34 facing away from the lower die holder 33. This also facilitates the engagement between the first locking member 81 and the punch backing plate 42 and reduces the overlapped dimension between the first locking member 81 and the lower plate 34 in the first direction e1.

[0192] On the basis of any of the above embodiments, in order to prevent the back-squeezing pad 51 and the back-squeezing clamping plate 54 from interfering with the movement stroke of the second locking member 82 , the back-squeezing pad 51 and the back-squeezing clamping plate 54 are both provided with through holes for avoiding the second locking member 82 .

[0193] In some embodiments, in order to limit the sliding direction of the first locking member 81, please refer to Figure 24 The avoidance space 342 includes a first inner wall surface 3421 and a second inner wall surface 3422 that oppose each other in a third direction e3. The third direction e3 is perpendicular to the first direction e1 and the second direction e2. The first locking member 81 includes a first side wall surface 811 and a second side wall surface 812 that oppose each other in the third direction e3. The first side wall surface 811 slidably engages with the first inner wall surface 3421, and the second side wall surface 812 slidably engages with the second inner wall surface 3422. This allows the first locking member 81 to be positioned in the third direction e3, reducing the shaking of the first locking member 81 during sliding, thereby improving the smoothness of the sliding process.

[0194] In order to limit the first locking member 81 in the first direction e1, please refer to Figure 24 A first step groove 814 is provided on the first side wall surface 811 and is recessed toward the second side wall surface 812 . The first step groove 814 penetrates the surface of the first locking member 81 facing away from the lower mold base 33 .

[0195] Please continue reading Figure 24 , a second step groove 343 is also provided on the lower pad 34, and the second step groove 343 passes through the surface of the lower pad 34 facing away from the lower die base 33, and passes through the first inner wall surface 3421. Furthermore, the stamping and back-extrusion device 400 also includes a first pressure block Y1, and the first pressure block Y1 is fixed in the second step groove 343, and a part of the first pressure block Y1 is located in the first step groove 814. Exemplarily, the first pressure block Y1 can be fixedly connected to the second step groove 343 by screws, pins, and bolt fasteners. In this way, the first locking member 81 can be limited in the first direction e1 by the first pressure block Y1 to prevent the first locking member 81 from slipping out of the avoidance space 342, thereby improving the position stability of the first locking member 81.

[0196] In some embodiments, in order to further improve the position stability of the first locking member 81, please refer to Figure 24The second sidewall surface 812 is provided with a third stepped groove 815 that is recessed toward the first sidewall surface 811. The third stepped groove 815 extends through the surface of the first locking member 81 facing away from the lower die base 33. The lower pad 34 is provided with a fourth stepped groove 344 that extends through the surface of the lower pad 34 facing away from the lower die base 33 and through the second inner wall surface 3422. The stamping and back-extrusion device 400 also includes a second pressing block Y2. The second pressing block Y2 is fixed within the fourth stepped groove 344, and a portion of the second pressing block Y2 is located within the third stepped groove 815.

[0197] See also Figure 22 In some embodiments, the first locking member 81 is provided with a first guide hole 816 that extends through the surface of the first locking member 81 facing away from the punch backing plate 42. A portion of the reset elastic member 62 is accommodated within the first guide hole 816. This not only helps increase the length of the reset elastic member 62, thereby increasing its elastic force, but also limits the direction of its expansion and contraction, preventing the force applied by the reset elastic member 62 to the first locking member 81 from deviating from its intended direction, thereby ensuring smooth reset of the first locking member 81.

[0198] For further information, see Figure 24 A second guide hole 345 is provided on the lower pad 34, and a portion of the reset elastic member 62 is located in the second guide hole 345. In some embodiments, the second guide hole 345 passes through the inner wall surface of the avoidance space 342 and the outer wall surface of the lower pad 34. In this case, a blocking member is provided in the second guide hole 345, and the two ends of the reset elastic member 62 are respectively connected to the blocking member and the first locking member 81. Exemplarily, the blocking member can be a nut. In this way, on the one hand, it is beneficial to increase the length of the reset elastic member 62, thereby increasing the elastic force of the reset elastic member 62. On the other hand, the second guide hole 345 can further limit the expansion and contraction direction of the reset elastic member 62, further preventing the direction of the force applied by the reset elastic member 62 to the first locking member 81 from deviating, thereby ensuring that the first locking member 81 can be smoothly reset. On the other hand, it can also reduce the difficulty of assembling the reset elastic member 62, and reduce the difficulty of processing the second guide hole 345, which can improve the processing efficiency of the stamping and extrusion device 400.

[0199] It is understandable that in other embodiments, the second guide hole 345 may also be a blind hole.

[0200] Based on any of the above examples, please refer back to Figure 18 Combined with Figure 20The second locking member 82 is provided with a first avoidance hole 824. The first avoidance hole 824 extends through the two opposing surfaces of the second locking member 82 in the second direction e2, and through the surface of the second locking member 82 facing the lower mold support structure 30. In both the first and second mating states, the return spring 62 extends through the first avoidance hole 824. The dimension of the first avoidance hole 824 in the first direction e1 is greater than the dimension of the protrusion 823 in the first direction e1. This prevents the return spring 62 from interfering with the movement of the second locking member 82, ensuring the normal operation of the stamping and back-extrusion processes.

[0201] In some embodiments, see Figure 25 , Figure 25 for Figure 7 The punching and re-extrusion device 400 is shown in a cross-sectional view taken along line BB. The punching and re-extrusion device 400 further includes a driving device 401 connected to the re-extrusion pad 51 to drive the re-extrusion pad 51 to move in the first direction e1, thereby driving the re-extrusion main body 52 to move in the first direction e1 through the re-extrusion pad 51. In this way, the reasonable movement of the back-extrusion main body 52 can be ensured. On the one hand, during the stamping process, the back-extrusion pad 51 can be driven by the driving device 401 to move downward relative to the punch assembly 40 to ensure that there is a gap between the back-extrusion main body 52 and the side plate 102 of the workpiece to be processed, thereby avoiding the back-extrusion main body 52 from interfering with the workpiece to be processed during the stamping process; on the other hand, after the die assembly 20 is separated from the punch assembly 40, the back-extrusion pad 51 can be driven by the driving device 401 to move upward relative to the punch assembly 40, so that the back-extrusion main body 52 can act on the side plate 102 of the workpiece to be processed, and eject the workpiece to be processed from the punch assembly 40, so that the back-extrusion main body 52 not only has the back-extrusion function, but also has the function of removing the workpiece from the punch assembly 40.

[0202] For details, please refer to Figure 25 The driving device 401 can be fixedly connected to the lower support plate 31. The driving device 401 includes but is not limited to a cylinder, a hydraulic system, an oil pressure system, etc. In order to facilitate the connection between the driving device 401 and the back squeeze pad 51, please refer to Figure 26 and Figure 27 , Figure 26 for Figure 7 The schematic diagram of the assembly of the driving device 401 and the back-extrusion component 50 in the punching and back-extrusion device 400 is shown. Figure 27 for Figure 7The figure shows a cross-sectional view of the drive unit 401, punch assembly 40, and back-extrusion assembly 50 in a punching and back-extrusion device 400. A second ejector pin 402 is disposed between the drive unit 401 and the back-extrusion pad 51. In this embodiment, the lower pad 34 and the lower die holder 33 are provided with third and fourth through-holes, respectively, through which the second ejector pin 402 is inserted.

[0203] In some embodiments, to improve the uniformity of force applied to the back-extrusion pad 51 and ensure smooth movement of the back-extrusion assembly 50, multiple drive devices 401 are provided. For example, the number of drive devices 401 may be two, three, four, five, or more. The specific number and placement of the drive devices 401 can be appropriately designed based on actual needs and are not specifically limited herein.

[0204] Refer to the following Figure 28 The working process of the punching and back-extrusion device 400 in the embodiment of the present application is described. Figure 28 Schematic diagram of the working process of the punching and back-extrusion device 400 in some embodiments of the present application.

[0205] See also Figure 28 In step (a), when the housing 100 is processed by the punching and extrusion device 400, the workpiece C3 to be processed can be placed on the punch body 41 and positioned by the positioning posts 403. The bottom plate and the side plate of the workpiece C3 to be processed can form a first angle between 60 degrees and 75 degrees.

[0206] Then, the driving device 401 drives the back-extrusion pad 51 to move downward, driving the back-extrusion main body 52 to move downward to a low position, thereby avoiding interference between the back-extrusion main body 52 and the side plate of the workpiece C3.

[0207] Then, the upper die support structure 10 and the die assembly 20 move downward as a whole. During this process, the inner stripper 22 of the die cooperates with the punch body 41 to press the workpiece C3 to be processed. Figure 28 As shown in (a) of FIG. 1 , the second locking member 82 is engaged with the first locking member 81 and is in a first engaged state. The first locking surface 81a of the first locking member 81 is engaged with the second locking surface 82a of the second locking member 82. The first abutting surface 42a of the punch pad 42 is abutted with the second abutting surface 81c of the first locking member 81, thereby maintaining relative fixation between the punch assembly 40 and the lower die support structure 30, thereby achieving rigid support of the lower die support structure 30 for the punch assembly 40. At this point, the inner stripper 22 of the die is spaced apart from the upper pad 12.

[0208] The upper die support structure 10 and the die body 21 continue to move downward, and the die body 21 contacts the side plate of the workpiece C3 to be processed, and begins to perform a 90° bending forming process on the workpiece to be processed.

[0209] See also Figure 28 In (b), as the upper die support structure 10 and the die body 21 move further downward, the 90° bending is completed and the stamping process is completed.

[0210] After the stamping process is completed, please refer to Figure 28 In (c), the upper die support structure 10 and the die body 21 continue to move downward, the die inner stripper 22 contacts and cooperates with the upper pad 12, driving the punch assembly 40 to move downward relative to the lower die support structure 30, and the first locking surface 81a of the first locking member 81 is disengaged from the second locking surface 82a of the second locking member 82, and the first mating surface 81b of the first locking member 81 is mated with the second mating surface 82b of the second locking member 82, the second locking member 82 releases the limit on the first locking member 81 in the second direction e2, and at the same time, the first locking member 81 releases the limit on the punch pad 42 in the first direction e1, and the rigid support of the lower die support structure 30 on the punch pad 42 disappears.

[0211] At this point, as the punch assembly 40 moves further downward, the back-extrusion main member 52 contacts the side panel of the workpiece C3 to be processed, completing the back-extrusion process on the workpiece C3. Simultaneously, under the pressure of the punch backing plate 42, the first locking member 81 moves in the second direction e2, away from the punch backing plate 42, and compresses the return spring member 62, compressing it into an energy-storing state. Furthermore, as the punch assembly 40 moves downward, the second elastic member 71 is compressed into an energy-storing state.

[0212] After the stamping and back-extrusion processes are completed, the upper die support structure 10 and the female die assembly 20 are moved upward as a whole, and the inner stripper 22 of the female die is separated from the male die body 41 (that is, after the die is opened), and the product obtained after the processing (such as the shell 100) is retained on the male die body 41. At this time, the back-extrusion pad 51 and the back-extrusion clamping plate 54 are pushed upward by the driving device 401, and the back-extrusion main body 52 is driven to push the product such as the shell 100 out of the male die body 41, as shown in FIG. Figure 28 As shown in (d) in .

[0213] After the product is ejected, the driving device 401 drives the return extrusion pad 51 and the return extrusion clamping plate 54 to move downward, and drives the return extrusion main body 52 to move downward and reset.

[0214] In other embodiments, see Figure 29 , Figure 29 The schematic diagram of the structure of the punching and extrusion device 400 provided in some other embodiments of the present application. Figure 7 The difference of the stamping and back-extrusion device 400 shown is that, in addition to the upper mold support structure 10, the die assembly 20, the lower mold support structure 30, the punch assembly 40, the back-extrusion assembly 50 and other structures, the stamping and back-extrusion device 400 in this embodiment also includes a flexible support mechanism 90, and the flexible support mechanism 90 provides different support forces for the punch assembly 40 to realize the switching of the punch assembly 40 in different working states.

[0215] In some embodiments, see Figure 29 The flexible support mechanism 90 is connected to the punch backing plate 42 and is located on the side of the punch backing plate 42 facing away from the punch body 41. The flexible support mechanism 90 is used to provide a force to the punch assembly 40 directed from the punch backing plate 42 to the punch body 41. The flexible support mechanism 90 can be switched between a first support state and a second support state. In the first support state, the flexible support mechanism 90 provides a first force to the punch assembly 40, thereby placing the punch assembly 40 in a first working state.

[0216] Specifically, the component of the force between the die assembly 20 and the punch assembly 40 in the first direction e1 is the third force. In the first support state, the third force is less than the component of the first force in the first direction e1, and the punch assembly 40 and the lower die support structure 30 can be relatively fixed. The flexible support mechanism can rigidly support the punch assembly 40, allowing the punch assembly 40 to cooperate with the die assembly 20 to perform stamping on the workpiece.

[0217] In the second support state, the flexible support mechanism 90 applies a second force to the punch assembly 40, placing the punch assembly 40 in the second operating state. The component of the second force in the first direction e1 is less than the component of the first force in the first direction e1. In this state, the third force is greater than the component of the second force in the first direction e1, allowing the punch assembly 40 to move toward the lower die support structure 30 along with the die assembly 20, allowing the back-extrusion body 52 to engage the workpiece to be processed, achieving back-extrusion processing of the workpiece.

[0218] For example, during the stamping process, the force applied by the flexible support mechanism 90 to the male mold assembly 40 may be increased. During the back-extrusion process, the force applied by the flexible support mechanism 90 to the male mold assembly 40 may be reduced.

[0219] In this way, the supporting state of the flexible support mechanism 90 can be adjusted, and the magnitude of the force provided by the flexible support mechanism 90 to the punch assembly 40 can be adjusted so that the supporting force can meet the supporting force required by the punch assembly 40 in the stamping process (such as 90-degree forming) and the supporting force required by the punch assembly 40 in the back-extrusion process. This can adjust the working state of the punch assembly 40 so that the punch assembly 40 can switch between the first working state and the second working state, thereby also enabling the stamping and back-extrusion device 400 to have stamping and back-extrusion functions.

[0220] In some embodiments, the flexible support mechanism 90 includes a drive mechanism 91, which is an oil pressure system or a hydraulic system. The operating principles of hydraulic systems and oil pressure systems are well known to those skilled in the art and will not be further described here. Thus, the force exerted by the flexible support mechanism 90 on the male mold assembly 40 can be varied by varying the pressure in the oil pressure system or the hydraulic system. This results in a simple structure and ease of implementation.

[0221] For further information, see Figure 29 The flexible support mechanism 90 includes a push plate 92 and a third push rod 93. The push plate 92 is located between the lower support plate 31 and the lower die base 33, and the push plate 92 is spaced apart from the lower support plate 31. The driving mechanism 91 is connected between the lower support plate 31 and the push plate 92. The two ends of the third push rod 93 are respectively connected to the connecting plate 72 and the punch pad 42. In order to achieve the connection between the third push rod 93 and the punch pad 42, a fifth through hole is respectively provided on the lower die base 33 and the lower pad 34, and the third push rod 93 is passed through the fifth through hole. On this basis, in order to improve the force uniformity of the punch assembly 40, a plurality of third push rods 93 can be provided. In this way, it is beneficial to increase the number of driving mechanisms 91, thereby increasing the supporting force that the flexible support mechanism 90 can provide.

[0222] The structures of the upper die support structure 10, the die assembly 20, the lower die support structure 30, the punch assembly 40, the back-extrusion assembly 50 of the punching and back-extrusion device 400 in this embodiment can all be referred to Figure 7 The design of the punching and back-extrusion device 400 in the illustrated embodiment is omitted for brevity.

[0223] See also Figure 30 , Figure 30 Schematic diagram of the process of forming the housing 100 provided in some other embodiments of the present application. The processing method of the housing 100 includes:

[0224] Step S1b: providing a sheet-shaped plate 100a;

[0225] Step S2b: performing a first stamping process on the plate 100a, bending the edge areas of the plate 100a to form side panels 102, and the middle area of ​​the plate 100a to form the bottom panel 101, and making the angle α between the side panels 102 and the bottom panel 101 a first angle, thereby obtaining a first blank 100b; wherein the first angle is less than 90 degrees (°);

[0226] For example, the first angle may be 60°, 70°, 75°, etc.

[0227] Step S3b: performing a second stamping process on the first blank 100b to make the angle α between the side plate 102 and the bottom plate 101 be 90°, thereby obtaining a second blank 100c; performing a back-extrusion process on the second blank 100c to obtain the housing 100.

[0228] Specifically, after step S3b, the R-angle 103 of the housing 100 can be reduced to less than 0.5 mm. The back-extrusion dimension is H. For example, the R-angle 103 of the housing 100 can be reduced from 0.8 mm to 0.3 mm.

[0229] Among them, step S3b can be adopted Figure 7 or Figure 29 The punching and extrusion device 400 shown in FIG.

[0230] Specifically, the processing method of the housing 100 in this embodiment can be achieved through three steps: providing a plate 100a, a first stamping process, a second stamping process, and back-extrusion integral forming.

[0231] In the embodiment of the present application, the stamping and re-extrusion device 400, by providing a locking assembly 80 or a flexible support mechanism 90, can not only meet the forming force required by the punch assembly 40 for 90-degree bending, but also meet the supporting force required by the punch assembly 40 in the re-extrusion process, and can realize the switching of the punch assembly 40 between the first working state and the second working state, so that the stamping and re-extrusion device 400 has a stamping function and a re-extrusion function, thereby realizing 90-degree bending and re-extrusion integrated forming.

[0232] Therefore, the stamping and back-extrusion device 400 in the embodiment of the present application can meet the requirement that the R angle 103 of the shell 100 such as aluminum alloy with a thickness of 0.6mm to 1.5mm is less than or equal to 0.5mm, while reducing the forming steps of the shell 100, simplifying the processing steps of the shell 100, improving production efficiency, reducing device cost and production cost, and avoiding scratches, bumps and other damages caused by the workpiece when transferring between different devices, which can effectively improve the production yield of the shell 100.

[0233] In the description of the specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0234] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A punching and back-extrusion device, characterized in that: include: Lower mold support structure; a punch assembly, the punch assembly being located on one side of the lower die support structure, the punch assembly comprising a punch backing plate and a punch body arranged in a first direction, the punch body being located on a side of the punch backing plate facing away from the lower die support structure; a back-extrusion assembly, the back-extrusion assembly being disposed on the lower die support structure, the back-extrusion assembly comprising a back-extrusion main body, the back-extrusion main body surrounding the outer periphery of the male die assembly, and the back-extrusion main body and the male die assembly being capable of relative movement along the first direction; In which, the punch assembly has a first working state and a second working state. In the first working state, the punch assembly and the lower mold support structure are relatively fixed in the first direction. In the second working state, the punch assembly can move relative to the lower mold support structure along the first direction.

2. The punching and extrusion device according to claim 1, characterized in that: include: a locking assembly comprising a first locking member and a second locking member, wherein the first locking member and the second locking member have a first engaged state and a second engaged state, wherein in the first engaged state, the first locking member abuts against the punch backing plate to restrict the punch backing plate from moving toward the lower die support structure; In the second mating state, the first locking member can move relative to the punch assembly along a second direction, so that the punch assembly can move relative to the lower mold support structure along a first direction; wherein, the second direction is perpendicular to the first direction.

3. The punching and extrusion device according to claim 2, characterized in that: The second locking member can move relative to the lower mold supporting structure along the first direction, so that the first locking member and the second locking member can switch between the first mating state and the second mating state.

4. The punching and extrusion device according to claim 3, characterized in that: The invention comprises a female mold assembly, wherein the female mold assembly comprises: A die body, wherein the die body and the punch assembly are movable relative to each other in the first direction, and an assembly hole is provided on the die body; a die inner stripper, the die inner stripper being disposed in the assembly hole, and the die inner stripper and the die body being capable of relative movement along the first direction; Wherein, the second locking member is relatively fixed to the die body.

5. The punching and extrusion device according to claim 3 or 4, characterized in that: The first locking member has a first locking surface, and the first locking surface is parallel to the first direction; In the first mating state, the second locking member is located on the side of the first locking member away from the central axis of the punch pad, and the second locking member abuts against the first locking surface; in the second mating state, the second locking member is disengaged from the first locking surface.

6. The punching and extrusion device according to claim 5, characterized in that: The second locking member has a second locking surface. In the first mating state, the first locking surface abuts against the second locking surface; in the second mating state, the first locking surface is disengaged from the second locking surface.

7. The punching and extrusion device according to claim 6, characterized in that: The second locking member comprises: a connecting rod, the connecting rod comprising a first surface, wherein in the first mating state, the first surface faces the punch backing plate; The protrusion is fixedly connected to the first surface, and the second locking surface is located on the end surface of the protrusion facing away from the connecting rod.

8. The punching and back-extrusion device according to any one of claims 5 to 7, characterized in that: The first locking member includes a first mating surface, and the second locking member also includes a second mating surface. In the second mating state, the second locking member abuts against the first mating surface; wherein, in the direction from the punch body to the punch pad, the first mating surface extends obliquely toward the central axis of the punch pad.

9. The punching and extrusion device according to claim 8, characterized in that: The first matching surface is connected to the first locking surface.

10. The punching and back-extrusion device according to any one of claims 2 to 8, characterized in that: It also includes a reset elastic member, which is located on the side of the first locking member facing away from the central axis of the punch pad, and in the first mating state, the reset elastic member is in a naturally extended state.

11. The punching and extrusion device according to claim 10, characterized in that: The second locking member is provided with a first avoidance hole, the first avoidance hole passing through two opposite surfaces of the second locking member in the second direction, and passing through a surface of the second locking member facing the lower mold support structure; In both the first mating state and the second mating state, the resetting elastic member is inserted into the first avoidance hole.

12. The punching and back-extrusion device according to any one of claims 2 to 11, characterized in that: The punch pad includes a first abutment surface, and in the first mating state, the first locking member abuts against the first abutment surface; wherein, in the direction from the punch body to the punch pad, the first abutment surface extends obliquely toward the central axis of the punch pad.

13. The punching and extrusion device according to claim 12, characterized in that: The punch pad comprises: a backing plate body, the backing plate body comprising a first top surface and a first bottom surface facing each other, the first top surface facing the male mold body; The abutment block is arranged on the first bottom surface, and the abutment block includes a first outer wall surface facing away from the central axis of the punch pad, and at least a portion of the first outer wall surface constitutes the first abutment surface.

14. The punching and extrusion device according to claim 12 or 13, characterized in that: The first locking member includes a second abutment surface, which is used to abut and cooperate with the first abutment surface. In the direction from the punch body to the punch pad, the second abutment surface extends obliquely toward the central axis of the punch pad.

15. The punching and back-extrusion device according to any one of claims 2 to 14, characterized in that: The lower die support structure includes a lower die base and a lower pad that are stacked, and the lower pad is located on a side of the lower die base close to the punch assembly; An escape space is provided on the lower pad, and the escape space passes through the surface of the lower pad facing away from the lower die base, and at least a portion of the first locking member is located in the escape space.

16. The punching and extrusion device according to claim 15, characterized in that: The avoidance space includes a first inner wall surface and a second inner wall surface opposite to each other in a third direction, wherein the third direction is perpendicular to the first direction and the third direction is perpendicular to the second direction; The first locking member includes a first side wall surface and a second side wall surface facing each other in the third direction, the first side wall surface is used for sliding cooperation with the first inner wall surface, and the second side wall surface is used for sliding cooperation with the second inner wall surface.

17. The punching and extrusion device according to claim 16, characterized in that: A first step groove is provided on the first side wall surface, which is recessed toward the second side wall surface. The first step groove passes through the surface of the first locking member facing away from the lower die base. A second step groove is also provided on the lower pad. The second step groove passes through the surface of the lower pad facing away from the lower die base and passes through the first inner wall surface. The punching and back-extrusion device further includes a first pressing block, which is fixed in the second step groove, and a portion of the first pressing block is located in the first step groove.

18. The punching and extrusion device according to claim 1, characterized in that: The flexible support mechanism includes a flexible support mechanism connected to the punch backing plate, and configured to provide a force directed from the punch backing plate to the punch body for the punch assembly, wherein the flexible support mechanism can be switched between a first support state and a second support state. In the first support state, the flexible support mechanism provides a first force to the punch assembly, so that the punch assembly is in the first working state. In the second supporting state, the flexible supporting mechanism provides a second force on the punch assembly to place the punch assembly in the second working state; the component of the second force in the first direction is smaller than the component of the first force in the first direction.

19. The punching and extrusion device according to claim 18, characterized in that: The flexible support mechanism includes a driving mechanism, and the driving mechanism is an oil pressure system or a hydraulic system.

20. The punching and back-extrusion device according to any one of claims 1 to 19, characterized in that: It also includes a driving device, which is connected to the back-extrusion component and is used to drive the back-extrusion main body to move along the first direction.

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