A punch press draw reducing die

Abstract

The stamping and extruding thin die provided by the utility model, comprising an upper die assembly and a lower die assembly, the upper die assembly comprises an upper die base and an upper die plate, and the lower die assembly comprises a lower die plate and a lower die base; the upper die assembly further comprises a bending and pressing punch for bending the aluminum plate and an extruding punch for extruding the bent aluminum plate, the bending and pressing punch and the extruding punch are both installed on the upper die plate, and the lower die assembly further comprises an extruding fixing block fixed in the lower die plate and used for corresponding cooperation with the extruding punch. Through the integration of the bending and pressing punch, the extruding punch and the extruding fixing block, the composite processing of "pre-bending + local extruding" on the aluminum plate is realized, the processing flow is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a stamping extrusion die. Background Technology

[0002] Currently, the mainstream method for thinning aluminum plates is chemical etching. Its core is to remove metal by using chemical etching solution to react with aluminum. The complete process requires four major steps: pretreatment, mask making, etching, and post-treatment. The area that does not need to be thinned is defined by the mask, and then the etching solution is applied to the unprotected area to finally achieve the thinning of the target area of ​​the aluminum plate.

[0003] However, traditional chemical etching methods have significant drawbacks: not only are the processing costs high and the production efficiency low, but they also generate a large amount of waste liquid and residue, putting great pressure on the environment; moreover, the etching process is uncontrollable and is prone to problems such as side etching and mask peeling, resulting in insufficient product precision.

[0004] Therefore, there is an urgent need for a stamping and extrusion die that can replace the traditional chemical etching process, achieve precise and efficient thinning of aluminum plates, simplify the production process, and reduce processing costs, so as to solve the above-mentioned defects. Summary of the Invention

[0005] The purpose of this invention is to provide a stamping and extrusion die that pre-bends the aluminum plate using a bending punch, stabilizing the aluminum plate before extrusion and preventing forming defects caused by force displacement during the subsequent extrusion process. The extrusion gap formed by the extrusion punch and the extrusion fixing block is smaller than the thickness of the aluminum plate, which can control the directional plastic flow of the material and achieve precise and efficient extrusion of the aluminum plate, thereby replacing the traditional chemical etching process.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: This utility model provides a stamping and extrusion die, including an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base and an upper template, and the lower die assembly includes a lower template and a lower die base. The upper die assembly also includes a bending punch for bending an aluminum plate and an extrusion punch for extruding the bent aluminum plate. Both the bending punch and the extrusion punch are installed on the upper template. The lower die assembly also includes an extrusion fixing block fixed inside the lower template and used to cooperate with the extrusion punch. When the upper mold assembly and the lower mold assembly are closed, the aluminum plate is bent by the interaction between the bending punch and the thinning fixing block. The thinning punch and the thinning fixing block cooperate to form a thinning gap smaller than the thickness of the aluminum plate. When the thinning punch moves relative to the thinning fixing block, it thins the bent aluminum plate within the thinning gap.

[0007] Furthermore, the upper die assembly also includes a first elastic element installed within the upper die base and a bending press rod disposed between the first elastic element and the bending press punch for transmitting pressure to the bending press punch.

[0008] Furthermore, the upper die assembly also includes a pressure back plate disposed below the upper die plate and a pressure plate located below the pressure back plate and fixedly connected to the pressure back plate. An movable gap is formed between the pressure back plate and the upper die plate for the upper die plate to move relative to the pressure plate. Both the pressure back plate and the pressure plate are provided with clearance through holes for the extrusion punch and the bending pressure punch to pass through.

[0009] Furthermore, the lower mold plate has a cavity, and the lower mold assembly also includes a stripping limit block that is movably disposed within the cavity.

[0010] Furthermore, the lower mold assembly also includes a second elastic element installed in the lower mold base and a stripping push rod disposed between the second elastic element and the stripping limit block for providing stripping force when the stripping limit block floats up.

[0011] Furthermore, the thinning fixing block and the stripping limiting block are arranged adjacent to each other in the lower die assembly, the thinning punch and the bending pressing punch are arranged adjacent to each other in the upper die assembly, the bending pressing punch and the thinning fixing block are arranged vertically correspondingly, and the thinning punch and the stripping limiting block are arranged vertically correspondingly.

[0012] Furthermore, the extrusion fixing block has a notch on the side near the stripping limiting block, and the lower end face of the bending pressing punch has an inclined surface that matches the notch. When the upper die assembly and the lower die assembly are closed, the aluminum plate is bent by the interaction between the inclined surface of the lower end face of the bending pressing punch and the notch on the extrusion fixing block.

[0013] Furthermore, the upper mold assembly also includes an upper pad disposed between the upper mold base and the upper template, and the lower mold assembly also includes a lower pad disposed between the lower mold base and the lower template.

[0014] Furthermore, the upper die assembly also includes a punch plate disposed on the upper die plate, and the bending punch and the extrusion punch are mounted on the upper die plate through the punch plate.

[0015] Furthermore, the upper die assembly also includes a pressure plate fixing member for fixing the punch pressure plate on the upper die plate, wherein the bending punch and the extrusion punch have steps formed on them, and the steps abut against the punch pressure plate.

[0016] The stamping and extrusion die provided by this utility model integrates a bending and pressing punch, an extrusion punch, and an extrusion fixing block, realizing a composite processing of "pre-bending + partial extrusion" of aluminum plates. This eliminates the need for multiple sets of dies or multiple processes, significantly shortening the processing flow and improving production efficiency. Specifically, the pre-bending of the aluminum plate by the bending and pressing punch stabilizes the plate before extrusion, preventing forming defects caused by force displacement during subsequent extrusion. The extrusion gap formed by the extrusion punch and the extrusion fixing block is smaller than the thickness of the aluminum plate, allowing for precise control of the directional plastic flow of the material. This ensures the uniformity of thickness and dimensional accuracy of the thinned area of ​​the aluminum plate, solving the problem of difficulty in controlling the thinning amount in traditional processing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the open state of a stamping and extrusion die provided in an embodiment of the present invention.

[0019] Figure 2 This is a structural schematic diagram of the pressing state of a stamping and extrusion die provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the closed state of a stamping and extrusion die provided in an embodiment of the present invention.

[0021] Figure 4 This is a diagram illustrating the aluminum plate thinning process according to an embodiment of the present invention.

[0022] In the diagram: 100, Upper die assembly; 200, Lower die assembly; 1, Upper die base; 2, Upper backing plate; 3, Bending pressure pin; 4, Extrusion punch; 5, Bending pressure punch; 6, Punch pressure plate; 7, Upper die plate; 8, Pressure plate fixing component; 9, Pressure back plate; 10, Pressure plate; 11, Extrusion fixing block; 12, Stripping limit block; 13, Lower die plate; 14, Lower backing plate; 15, Lower die base; 16, Stripping pin; 17, First elastic element; 18, Second elastic element; 19, Aluminum plate; 20, Cavity; 21, Clearance through hole; 22, Step; 23, Inclined surface; 24, Notched corner. Detailed Implementation

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model. In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when this utility model is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0026] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0027] like Figures 1 to 4 As shown, the preferred embodiment of the present invention provides a stamping and extrusion die, including an upper die assembly 100 and a lower die assembly 200. The upper die assembly 100 includes an upper die base 1, an upper backing plate 2, a bending pressure rod 3, an extrusion punch 4, a bending pressure punch 5, a punch pressure plate 6, an upper template 7, a pressure plate fixing member 8, a pressure back plate 9, a pressure plate 10, and a first elastic member 17. The lower die assembly 200 includes an extrusion fixing block 11, a stripping limiting block 12, a lower template 13, a lower backing plate 14, a lower die base 15, a stripping pressure rod 16, and a second elastic member 18.

[0028] Specifically, the upper mold base 1 serves as the supporting base for all parts of the upper mold assembly 100, and an upper pad 2 is connected below it. The upper surface of the upper pad 2 is in close contact with the lower surface of the upper mold base 1, and the lower surface of the upper pad 2 is in close contact with the upper surface of the upper template 7. This is used to evenly distribute the pressure transmitted by the upper mold base 1 onto the upper template 7, avoiding direct contact between the upper template 7 and the upper mold base 1, which could lead to localized wear, while also enhancing the overall rigidity of the upper mold assembly 100.

[0029] Specifically, the upper template 7 is located below the upper pad 2, and it has pre-drilled holes specifically for installing the extrusion punch 4 and the bending press punch 5. The extrusion punch 4 is a mold part used for metal plastic forming. Its core function is to apply axial extrusion force to the bent aluminum plate 19, forcing the material to undergo directional plastic flow within the mold cavity, thereby achieving thickness reduction in a specific area. The bending press punch 5 is a mold part used in the stamping process. During the bending process, it directly contacts and applies pressure to the raw material aluminum plate 19, ensuring that the material does not slip or shift during the bending process.

[0030] Specifically, a punch pressure plate 6 is provided on the lower surface of the upper template 7. The punch pressure plate 6 is a plate-shaped part used in the stamping and extrusion die to fix the extrusion punch 4 and the bending punch 5. The punch pressure plate 6 is fixed to the upper template 7 by a pressure plate fixing member 8. Specifically, the pressure plate fixing member 8 can be a pressure plate screw, which passes through the punch pressure plate 6 from below and is screwed into a pre-reserved connection hole (not shown in the figure) on the lower surface of the upper template 7. When the pressure plate screw is tightened, the punch pressure plate 6 will fit tightly against the lower surface of the upper template 7. The bending punch 5 and the extrusion punch 4 have radially protruding steps 22. The bending punch 5 and the extrusion punch 4 abut against the punch pressure plate 6 through the steps 22, thereby restricting the bending punch 5 and the extrusion punch 4 from disengaging in the first direction D1.

[0031] Specifically, the bending pressure ejector 3 is used to apply pressure to the bending pressure punch 5 during the bending process. The bending pressure ejector 3 is installed inside the upper die holder 1 and the upper backing plate 2, corresponding vertically to the bending pressure punch 5, ensuring precise contact between the bending pressure ejector 3 and the bending pressure punch 5. The bending pressure ejector 3 is columnar, with its lower end abutting against the upper end face of the bending pressure punch 5. When the die is closed, the upper die holder 1 moves downward, transmitting pressure to the bending pressure punch 5 through the bending pressure ejector 3, enabling the bending pressure punch 5 to apply stable pressure to the aluminum plate 19 and complete the bending action. When the die is opened, the bending pressure ejector 3 moves upward with the upper die holder 1, maintaining contact with the bending pressure punch 5 to ensure accurate pressure transmission during the next die closing.

[0032] In this embodiment, the first elastic element 17 is installed inside the upper die base 1, and the bending pressure ejector 3 is disposed between the first elastic element 17 and the bending pressure ejector 3. The lower end of the first elastic element 17 is in contact with the top of the bending pressure ejector 3, and the upper end is fixed inside the upper die base 1. When the first elastic element 17 is in its naturally extended state, it can generate a downward thrust on the bending pressure ejector 3, so that the lower end of the bending pressure ejector 3 always maintains close contact with the upper end face of the bending pressure punch 5, providing continuous pre-pressure for the bending pressure punch 5.

[0033] Specifically, such as Figure 2 and Figure 3 As shown, during the mold closing process, the upper mold assembly 100 moves towards the lower mold assembly 200 along the first direction D1. As the upper mold base 1 moves downward, the bending pressure punch 5 is subjected to the reaction force of the aluminum plate 19, which pushes the bending pressure ejector rod 3 upward, causing the first elastic element 17 to be gradually compressed and storing elastic potential energy. At this time, the elastic force generated by the first elastic element 17 is transmitted to the bending pressure punch 5 through the bending pressure ejector rod 3, ensuring that the pressing force of the bending pressure punch 5 on the aluminum plate 19 remains stable and preventing the aluminum plate 19 from shifting during the bending process. When the mold opens, the first elastic element 17 releases its potential energy, pushing the bending pressure ejector rod 3 and the bending pressure punch 5 to reset, preparing for the next stamping.

[0034] A pressure plate 9 is positioned below the upper template 7, and a pressure plate 10 is fixedly connected to the pressure plate 9. The shape of the pressure plate 9 is adapted to the upper template 7, and a certain clearance is reserved between the upper surface of the pressure plate 9 and the lower surface of the upper template 7. When the upper mold base 1 moves the upper pad 2 and the upper template 7 downward together, this clearance provides space for the upper template 7 to move relative to the pressure plate 9. The pressure plate 10 is attached to the lower surface of the pressure plate 9. The pressure plate 10 and the pressure plate 9 have through holes 21 on their respective positions corresponding to the thinning punch 4 and the bending pressure punch 5, allowing the thinning punch 4 and the bending pressure punch 5 to extend out of the pressure plate 10 during mold closing to process the aluminum plate 19. The pressure plate 10 and the pressure plate 9 are used for pressing material during the stamping process, and also serve to guide and protect the thinning punch 4 and the bending pressure punch 5 in the mold.

[0035] Specifically, the clearance remains at its maximum value in the open mold state. During the mold closing process, the upper mold assembly 100 descends, and the pressure plate 10 first contacts and presses against the aluminum plate 19. Subsequently, the upper template 7 overcomes the supporting force of the floating connector and moves downward relative to the stationary pressure back plate 9, causing the clearance to gradually decrease. When the upper template 7 is fully in contact with the pressure back plate 9, the pressure of the upper mold assembly 100 is rigidly transmitted through the closed clearance, driving the bending pressure punch 5 and the thinning punch 4 to complete the bending and thinning processes.

[0036] In this embodiment, the lower die base 15 serves as the base of the lower die assembly 200, and a lower pad 14 is provided on its upper surface. The lower surface of the lower pad 14 is in close contact with the upper surface of the lower die base 15, and the upper surface is in close contact with the lower surface of the lower template 13. This is used to evenly transfer the stamping pressure borne by the lower template 13 to the lower die base 15, disperse the stamping pressure of the extrusion punch 4 and the bending pressing punch 5, avoid the lower template 13 directly contacting the lower die base 15 and causing wear, and at the same time enhance the overall rigidity of the lower die assembly 200.

[0037] Specifically, the lower template 13 is located above the lower pad 14, and an installation position for the extrusion fixing block 11 is reserved on it. The extrusion fixing block 11 is fixed inside the lower template 13 to ensure that the extrusion fixing block 11 can accurately cooperate with the upper extrusion punch 4 to form an extrusion gap for extruding the aluminum plate 19. On one hand, the thinning fixing block 11 is used to support and position the aluminum plate 19, ensuring that the material maintains a stable position during bending. On the other hand, the thinning fixing block 11 works in conjunction with the bending pressure punch 5, and the aluminum plate 19 is bent through the interaction between the bending pressure punch 5 and the thinning fixing block 11. Furthermore, the thinning fixing block 11 also works in conjunction with the thinning punch 4. When the mold is closed, the thinning punch 4 and the thinning fixing block 11 cooperate with each other, forming a thinning gap between them in a second direction D2 perpendicular to the first direction D1. This thinning gap is smaller than the thickness of the aluminum plate 19. When the thinning punch 4 moves relative to the thinning fixing block 11, it squeezes the bent aluminum plate 19 within this thinning gap, causing the aluminum plate 19 material to flow in a directional manner under pressure to achieve thinning. Specifically, the first direction D1 is the up-down direction in the figure, and the second direction D2 is the left-right direction in the figure.

[0038] The lower mold plate 13 has a cavity 20. The stripper block 12 has an inverted L-shaped structure and is movably disposed within the cavity 20. In the open mold state, the upper part of the stripper block 12 extends out of the cavity 20, higher than the upper surface of the lower mold plate 13. At this time, there is a gap between its upper end face and the lower surface of the pressure plate 10, leaving space for the placement of the aluminum plate 19. The stripper block 12 is used to limit the downward movement of the extrusion punch 4 and the bending pressure punch 5 when the mold is closed, preventing the punches from colliding with the lower mold components due to excessive downward movement or causing over-processing of the aluminum plate 19, thereby ensuring the stamping accuracy and mold safety.

[0039] Specifically, such as Figure 2 As shown, during the mold closing process, the pressure plate 10 moves downward with the upper mold assembly 100, and its lower surface first contacts the upper end of the stripper block 12 protruding from the lower mold plate 13. Then, it pushes the stripper block 12 into the cavity 20, so that the stripper block 12 is completely retracted into the cavity 20. When the upper end surface of the stripper block 12 is pressed to be flush with the upper surface of the lower mold plate 13, the lower surface of the pressure plate 10 contacts the aluminum plate 19 and presses it firmly onto the lower mold plate 13.

[0040] The second elastic element 18 is installed inside the lower mold base 15. One end of the stripper rod 16 is connected to the second elastic element 18, and the other end of the stripper rod 16 abuts against the stripper limiting block 12. In the mold-open state, the second elastic element 18 is in a naturally extended state, generating an upward thrust on the stripper rod 16, causing the stripper rod 16 to push the stripper limiting block 12 upward and maintain it in the position supporting the aluminum plate 19. The second elastic element 18 and the stripper rod 16 provide stripping force when the stripper limiting block 12 floats upward.

[0041] Specifically, the thinning fixing block 11 and the stripping limiting block 12 are arranged adjacent to each other in the lower die assembly 200, the thinning punch 4 and the bending pressing punch 5 are arranged adjacent to each other in the upper die assembly 100, the bending pressing punch 5 and the thinning fixing block 11 are arranged vertically correspondingly, the thinning punch 4 and the stripping limiting block 12 are arranged vertically correspondingly, the thinning fixing block 11 has a notch 24 at the upper right corner near the stripping limiting block 12, and the lower end face of the bending pressing punch 5 has a slope 23 that matches the notch 24. When the upper die assembly 100 descends relative to the lower die assembly 200 and closes the die, the lower end face of the bending punch 5 contacts the aluminum plate 19. The bending of the aluminum plate 19 is completed through the interaction of the inclined surface 23 of the lower end face of the bending punch 5 and the notch 24 on the thinning fixing block 11. The inclined surface 23 and the notch 24 allow the aluminum plate 19 to be bent smoothly, preventing it from breaking due to stress concentration. Then, as the thinning punch 4 continues to descend, because the thinning gap formed between the thinning punch 4 and the thinning fixing block 11 is smaller than the thickness of the aluminum plate 19, the right end of the bent aluminum plate 19 will be thinned within this thinning gap as the punch 4 descends. Figure 3 As shown.

[0042] In this embodiment, from a functional mechanism perspective, the stamping and extrusion die can be divided into a bending and pressing mechanism, an extrusion mechanism, and a stripping mechanism. These mechanisms work together to achieve composite processing of the aluminum plate 19. The bending and pressing mechanism mainly includes a bending and pressing punch 5, a bending and pressing ejector rod 3, and a first elastic element 17. Its function is to bend the aluminum plate 19 and stabilize it before extrusion, preventing forming defects caused by force displacement during subsequent extrusion. The extrusion mechanism mainly includes an extrusion punch 4 and an extrusion fixing block 11. Its function is to apply axial compressive force to the bent aluminum plate 19 to achieve precise thinning. The stripping mechanism mainly includes a stripping limit block 12, a stripping ejector rod 16, and a second elastic element 18. Its function is to separate the aluminum plate 19 from the bending and pressing punch 5 and the extrusion punch 4 after stamping (including bending and thinning the aluminum plate 19) through the coordinated movement of these components, preventing the aluminum plate 19 from sticking together. The pressure plate 10 and the pressure back plate 9 are independent pressure components, responsible for pressing the aluminum plate 19 during the stamping process, and providing guidance and protection for the bending pressure punch 5 and the extrusion punch 4.

[0043] Specifically, the process sequence of bending before extrusion is key to achieving precise and controllable thinning. If a flat aluminum plate 19 is directly extruded, the material will flow freely to both sides under pressure, leading to severe material accumulation, workpiece warping, and dimensional instability, making it impossible to achieve precise "directional plastic flow." Bending first effectively restricts the material flow, forcing it to extend along the long side of the aluminum plate 19, thereby ensuring the accuracy and consistency of thickness reduction. The aluminum plate 19 processed by this invention is mainly used in applications requiring lightweight, structural strength, and space utilization, especially in the consumer electronics field, such as the metal frames and shells of smartphones and laptops.

[0044] This invention achieves precise and controllable thinning of the 19mm long side region of an aluminum plate through mechanical stamping by coordinating a bending and pressing mechanism, a thinning mechanism, and a stripping mechanism. This completely replaces the traditional chemical etching process, avoiding the use of chemical solutions and wastewater treatment issues, thus achieving clean production. The precise matching of the mold directly controls the thinning gap, eliminating quality defects such as side etching and over-etching, significantly improving product consistency and dimensional accuracy. Bending and thinning can be completed in a single stamping cycle, increasing production efficiency by orders of magnitude. Simultaneously, manufacturing costs are significantly reduced.

[0045] The specific operating steps of this utility model are as follows: 1. Mold preparation: The operator or a robot feeds the aluminum plate 19 into the mold and places it on the surface of the lower template 13, with the area to be processed aligned with the working position of the extrusion mechanism to complete the feeding.

[0046] 2. The upper mold assembly 100 moves downward. The lower surface of the pressure plate 10 first contacts the upper end face of the stripper block 12, which protrudes from the surface of the lower mold plate 13. As the upper mold assembly 100 continues to descend, the pressure plate 10 pushes the stripper block 12, overcoming the resistance of the second elastic element 18 below it, causing it to move downward and fully retract into the cavity 20 of the lower mold plate 13. When the upper surface of the stripper block 12 is pressed flush with the upper surface of the lower mold plate 13, the lower surface of the pressure plate 10 then contacts the aluminum plate 19 and firmly presses it onto the surface of the lower mold plate 13, as shown. Figure 2 As shown.

[0047] 3. After the pressing action is completed, the upper die assembly 100 continues to descend. At this time, the upper die plate 7 begins to move downward relative to the already compacted pressure plate 10, and the preset floating gap between the two begins to gradually close. With this relative movement, the bending pressure punch 5 and the thinning punch 4 installed on the upper die plate 7 extend downward from the corresponding clearance through holes 21 on the pressure plate 10.

[0048] 4. The bending punch 5 first contacts the aluminum plate 19 and completes a pre-bend at a predetermined angle. Immediately afterwards, the extrusion punch 4 applies pressure perpendicular to the bent edge surface of the aluminum plate 19. Because the extrusion gap between the extrusion punch 4 and the fixed extrusion block 11 below is smaller than the original thickness of the aluminum plate 19, the material of the aluminum plate 19 is forced to undergo directional plastic flow within this confined space, and its thickness is precisely reduced, such as... Figure 3 As shown.

[0049] 5. After the stamping action is completed, the upper die assembly 100 moves upward. The upper die plate 7 first moves upward, causing the extrusion punch 4 and bending pressure punch 5 to exit from the formed product. Subsequently, the floating gap between the upper die plate 7 and the pressure plate 9 reappears and returns to its original state. Next, under the action of the second elastic element 18 below the stripper limit block 12, the stripper ejector rod 16 pushes the stripper limit block 12 upward, and the stripper limit block 12 then pushes the pressure plate 10 upward, thereby separating the product from the die.

[0050] Specifically, taking the reduction of a 0.25mm thick aluminum plate to 0.20mm as an example, to avoid necking caused by insufficient material elongation due to a single reduction of 0.05mm, this invention adopts a progressive die structure. The plate is thinned in two steps through two extrusion stations set along the feeding direction, controlling the single-step deformation rate within 15%. The first station thins the plate from 0.25mm to 0.23mm, and the second station further thins it to the target thickness of 0.20mm.

[0051] like Figures 1 to 3As shown, the stamping and extrusion die structure consists of an upper die assembly 100 and a lower die assembly 200. The upper die assembly 100 is fixed to the upper table of the press; the lower die assembly 200 is locked to the lower table of the press by bolts and pressure plates. During the stamping process, the lower die assembly 200 remains stationary, and the slide block on the press, driven by the press crank, moves the upper die assembly 100 downward. When the slide block moves to the point where the pressure plate 10 contacts the stripping limit block 12 protruding from the lower die plate 13, the slide block continues to press down. The pressure plate 10 pushes the stripping limit block 12 downward against the resistance of the second elastic element 18 until the stripping limit block 12 is completely retracted into the cavity 20, and its upper surface is flush with the upper surface of the lower die plate 13. At this time, the pressure plate 10 presses the aluminum plate 19 tightly against the surface of the lower die plate 13. Subsequently, the upper template 7, upper pad 2, and upper die base 1 continue to move downward. At this time, the upper template 7 moves downward relative to the pressure plate 10, causing the bending pressure punch 5 to contact the aluminum plate 19 to complete the bending. After the bending is completed, the thinning punch 4 applies axial pressure to the aluminum plate 19 in the vertical direction. Specifically, the upper template 7 will move towards the pressure back plate 9 until the two are in contact. The pressure back plate 9 is provided with a receiving groove (not shown in the figure) to receive the punch pressure plate 6 and the pressure plate fixing member 8. The upper die base 1 and upper pad 2 move downward and drive the thinning punch 4 to move downward, completing the thinning of the aluminum plate 19. Meanwhile, the bending pressure punch 5 remains in the bending position. That is, during the downward movement of the upper die base 1, upper pad 2, and upper template 7, the bending pressure punch 5 will move inside the upper template 7 and compress the first elastic member 17 through the bending pressure push rod 3. Because the extrusion gap between the extrusion punch 4 and the extrusion fixing block 11 is smaller than the thickness of the aluminum plate 19, the aluminum plate 19 is squeezed and undergoes elastic deformation. When the pressure exceeds the yield strength (e.g., the yield strength of 5052-H32 aluminum plate 19 is about 190 MPa), the aluminum plate 19 undergoes plastic deformation under the action of radial compressive stress (from the extrusion of the extrusion punch 4) and axial tensile stress (from the flow of the material), and the thickness of the aluminum plate 19 is reduced from 0.25 mm to 0.23 mm. Until the aluminum plate 19 cools and solidifies, the extrusion punch 4 and the bending pressing punch 5 rise back to their initial positions, completing the first step of extrusion. The strip is then sent to the second extrusion station, where the above-mentioned stamping action is repeated. The extrusion gap between the extrusion punch 4 and the extrusion fixing block 11 at the second station is preset to 0.20 mm, so the aluminum plate 19 is further extruded at the second station, and the thickness is reduced from 0.23 mm to 0.20 mm.

[0052] The stamping and extrusion die provided by this utility model integrates a bending and pressing mechanism with an extrusion mechanism, realizing a composite processing of "pre-bending + partial extrusion" for aluminum plate 19. This eliminates the need for multiple sets of dies or multiple processes, significantly shortening the processing flow and improving production efficiency. Specifically, the bending and pressing mechanism pre-bends the aluminum plate 19 using the bending and pressing punch 5, stabilizing the aluminum plate 19's posture before extrusion and preventing forming defects caused by force displacement during subsequent extrusion. In the extrusion mechanism, the extrusion gap formed by the extrusion punch 4 and the extrusion fixing block 11 is smaller than the thickness of the aluminum plate 19, allowing for precise control of the directional plastic flow of the material. This ensures the uniformity of thickness and dimensional accuracy of the thinned area of ​​the aluminum plate 19, solving the problem of difficulty in controlling the thinning amount in traditional processing.

[0053] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A stamping and extrusion die, comprising an upper die assembly (100) and a lower die assembly (200), wherein the upper die assembly (100) includes an upper die base (1) and an upper template (7), and the lower die assembly (200) includes a lower template (13) and a lower die base (15); characterized in that, The upper die assembly (100) further includes a bending punch (5) for bending the aluminum plate (19) and a thinning punch (4) for thinning the bent aluminum plate (19). The bending punch (5) and the thinning punch (4) are both installed on the upper die plate (7). The lower die assembly (200) further includes a thinning fixing block (11) fixed in the lower die plate (13) and used to cooperate with the thinning punch (4). When the upper mold assembly (100) and the lower mold assembly (200) are closed, the aluminum plate (19) is bent by the interaction between the bending punch (5) and the thinning fixing block (11). The thinning punch (4) and the thinning fixing block (11) cooperate to form a thinning gap smaller than the thickness of the aluminum plate (19). When the thinning punch (4) moves relative to the thinning fixing block (11), it thins the bent aluminum plate (19) in the thinning gap.

2. The stamping and extrusion die according to claim 1, characterized in that, The upper die assembly (100) further includes a first elastic element (17) installed in the upper die base (1) and a bending press rod (3) disposed between the first elastic element (17) and the bending press punch (5) for transmitting pressure to the bending press punch (5).

3. The stamping and extrusion die according to claim 1, characterized in that, The upper die assembly (100) further includes a pressure back plate (9) disposed below the upper die plate (7) and a pressure plate (10) located below the pressure back plate (9) and fixedly connected to the pressure back plate (9). An movable gap is formed between the pressure back plate (9) and the upper die plate (7) for the upper die plate (7) to move relative to the pressure plate (10). Both the pressure back plate (9) and the pressure plate (10) are provided with clearance through holes (21) for the extrusion punch (4) and the bending pressure punch (5) to pass through.

4. The stamping and extrusion die according to claim 1, characterized in that, The lower mold plate (13) has a cavity (20), and the lower mold assembly (200) also includes a stripping limit block (12) that is movably disposed in the cavity (20).

5. The stamping and extrusion die according to claim 4, characterized in that, The lower mold assembly (200) also includes a second elastic element (18) installed in the lower mold base (15) and a stripping push rod (16) disposed between the second elastic element (18) and the stripping limit block (12) for providing stripping force when the stripping limit block (12) floats up.

6. The stamping and extrusion die according to claim 4, characterized in that, The extrusion fixing block (11) and the stripping limiting block (12) are arranged adjacent to each other in the lower die assembly (200). The extrusion punch (4) and the bending pressing punch (5) are arranged adjacent to each other in the upper die assembly (100). The bending pressing punch (5) and the extrusion fixing block (11) are arranged vertically and vertically respectively. The extrusion punch (4) and the stripping limiting block (12) are arranged vertically and vertically respectively.

7. The stamping and extrusion die according to claim 4, characterized in that, The extrusion fixing block (11) has a notch (24) on the side near the stripping limiting block (12), and the lower end face of the bending pressing punch (5) has a slope (23) that matches the notch (24). When the upper die assembly (100) and the lower die assembly (200) are closed, the aluminum plate (19) is bent by the interaction between the slope (23) on the lower end face of the bending pressing punch (5) and the notch (24) on the extrusion fixing block (11).

8. The stamping and extrusion die according to any one of claims 1-7, characterized in that, The upper mold assembly (100) further includes an upper pad (2) disposed between the upper mold base (1) and the upper template (7), and the lower mold assembly (200) further includes a lower pad (14) disposed between the lower mold base (15) and the lower template (13).

9. The stamping and extrusion die according to any one of claims 1-7, characterized in that, The upper die assembly (100) also includes a punch plate (6) disposed on the upper template (7), and the bending punch (5) and the extrusion punch (4) are mounted on the upper template (7) through the punch plate (6).

10. The stamping and extrusion die according to claim 9, characterized in that, The upper die assembly (100) further includes a pressure plate fixing member (8) for fixing the punch pressure plate (6) on the upper template (7). The bending pressing punch (5) and the extrusion punch (4) have steps (22) formed on them and abut against the punch pressure plate (6) through the steps (22).

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