Hard workpiece local heating punch forming device

Abstract

The utility model discloses a device for locally heating, stamping and forming a hard workpiece, and relates to the technical field of stamping dies. The mold comprises a lower mold assembly, an upper mold assembly and a heating assembly. A male die is arranged on the top side of the lower die assembly, and a workpiece is placed on the upper surface of the male die. The upper die assembly is arranged above the lower die assembly in the vertical direction. A concave mold matched with the convex mold is arranged on one side, facing the lower mold assembly, of the upper mold assembly; the heating assembly is arranged on the lower die assembly and located on the peripheral side of the male die. When a workpiece is placed on the upper surface of the male die, the heating assembly heats the edge of the workpiece so as to soften the edge of the workpiece, and the upper die assembly moves downwards so that the female die and the male die can be closed to conduct punch forming on the workpiece. By the adoption of the technical scheme, the method has the advantages that workpiece breakage is avoided, workpiece shaping is easy, and the hardness of a workpiece body is kept.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically to a device for locally heating and stamping hard workpieces. Background Technology

[0002] Traditional stamping technology often uses soft metal materials, such as soft aluminum, when processing the housings of various electronic devices to achieve ease of machining. However, using soft metal materials for electronic device housings often presents challenges, such as the inability to achieve thinner and lighter designs due to the need for sufficient support, and the materials being prone to deformation and impact damage. Replacing the soft metal with a high-hardness metal offers improved impact resistance and less deformation, but it suffers from poor plasticity, a higher risk of breakage during processing, and the inability to meet the requirements for edge upsetting during assembly. Utility Model Content

[0003] The purpose of this invention is to address the deficiencies and shortcomings of the existing technology by providing a device for local heating and stamping of hard workpieces, which solves at least one of the aforementioned technical problems and has the advantages of avoiding workpiece breakage, facilitating workpiece shaping, and maintaining the hardness of the workpiece body.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a device for local heating and stamping of hard workpieces, comprising:

[0005] The lower mold assembly has a punch on its top side, and the upper surface of the punch is used to place the workpiece.

[0006] An upper mold assembly, which is vertically oriented and positioned above the lower mold assembly; the upper mold assembly has a concave mold on its side facing the lower mold assembly, which mates with the convex mold; and

[0007] A heating component is disposed on the lower mold assembly and located on the periphery of the punch mold;

[0008] When the workpiece is placed on the upper surface of the punch, the heating assembly heats the edge of the workpiece to soften the edge, and the upper die assembly moves downward to make the concave die and the punch die close together to stamp the workpiece.

[0009] The present invention is further provided that the heating components are provided in four parts.

[0010] The present invention further comprises: a fixing member disposed on the side wall of the lower mold assembly and extending away from the lower mold assembly; a pushing member disposed on the side of the fixing member away from the lower mold assembly and with its telescopic end facing the punch; a movable member disposed on the telescopic end of the pushing member; and a heating element disposed on the movable member; under the pushing or pulling action of the telescopic end of the pushing member, the movable member drives the heating element to move or retract towards the punch.

[0011] The present invention further includes, in the device for local heating and stamping of hard workpiece, a guide and limiting component located between the upper die component and the lower die component.

[0012] The present invention further includes: a guide limiting hole formed on the side of the upper mold assembly facing the lower mold assembly, and a guide limiting post formed on the side of the lower mold assembly facing the upper mold assembly and extending upward; the guide limiting hole and the guide limiting post cooperate to prevent the upper mold assembly from being excessively pressed down.

[0013] The present invention further includes, in that, the upper mold assembly comprises, from top to bottom, an upper mold base, an upper pad, and an upper clamping plate acting on the top surface of the workpiece; the upper clamping plate is provided with the concave mold on the side facing the lower mold assembly.

[0014] The present invention further includes the following: the lower mold assembly includes a lower mold base, a lower base plate, a lower pad plate, and a lower template arranged sequentially from bottom to top; the lower template has the punch mold on the side facing the upper mold assembly; the lower template cooperates with the upper clamping plate to clamp the workpiece.

[0015] The present invention further includes, in the device for local heating and stamping of hard workpiece, a driving component disposed at the bottom of the lower template and located between the lower base plate and the lower pad plate; the output end of the driving component abuts against the bottom surface of the lower template to make the lower template move upward or downward in the vertical direction.

[0016] In a further embodiment of this invention, two drive components are provided and are placed symmetrically.

[0017] The present invention further includes, in that, the lower mold assembly further includes, a lower pad disposed on the bottom surface of the lower mold base; the lower pad is provided in one or more manner.

[0018] The beneficial effects of this utility model after adopting the above technical solution are as follows: In this utility model, the heating component is set on the lower die assembly and located on the periphery of the punch, so as to heat the workpiece edge where it does not contact the upper surface of the punch, thus preventing the workpiece edge from breaking due to excessive hardness during the stamping process. In addition, the workpiece edge also corresponds to the bending part of the workpiece when the punch and die are closed. Heating this part by the heating component facilitates the shaping of the workpiece during the subsequent stamping and die closing process, while maintaining the hardness of the workpiece body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a structural diagram of the present invention when the movable part is detached from the top surface of the lower template;

[0022] Figure 3 This is a top-view structural schematic diagram of the present invention;

[0023] Figure 4 It corresponds Figure 3 A sectional view along the AA direction;

[0024] Figure 5 This is an exploded view of the structure of this utility model;

[0025] Figure 6 This is a structural schematic diagram of the upper mold assembly;

[0026] Figure 7 This is a structural schematic diagram of the lower mold assembly;

[0027] Figure 8 This is a structural diagram of the lower mold assembly when the movable part is detached from the top surface of the lower mold plate.

[0028] Explanation of reference numerals in the attached drawings: 100, Upper mold assembly; 110, Upper mold base; 120, Upper backing plate; 130, Upper clamping plate; 200, Lower mold assembly; 210, Lower template; 220, Lower backing plate; 230, Lower base plate; 240, Lower mold base; 250, Lower support foot; 310, Cavity mold; 320, Punch mold; 400, Heating assembly; 410, Fixing component; 420, Pushing component; 430, Moving component; 440, Heating element; 510, Guide limiting hole; 520, Guide limiting post; 600, Drive assembly. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0031] This embodiment relates to an apparatus for locally heating and stamping hard workpieces, referring to... Figures 1-3 The system includes a lower die assembly 200, an upper die assembly 100, and a heating assembly 400. The lower die assembly 200 has a punch 320 on its top side, the upper surface of which is used to place the workpiece. The upper die assembly 100 is vertically positioned above the lower die assembly 200. The upper die assembly 100 has a concave die 310 on its side facing the lower die assembly 200, which mates with the punch 320. The heating assembly 400 is located on the lower die assembly 200 and around the punch 320. When the workpiece is placed on the upper surface of the punch 320, the heating assembly 400 heats the edges of the workpiece to soften them. The upper die assembly 100 moves downwards to allow the concave die 310 and punch 320 to close and stamp the workpiece. Conventional hard workpieces, due to their high hardness, are prone to problems such as difficulty in shaping and breakage during stamping, resulting in low yield, reduced processing progress, and increased production costs. In this apparatus for localized heating and stamping of hard workpieces, a heating component 400 is used to locally heat the edges of the workpiece (i.e., the bent portion of the workpiece when the die 310 and punch 320 are closed) to soften the edges. This prevents the edges from becoming too hard to shape during the stamping process, which could even cause the workpiece to break. The heating and softening treatment of the workpiece edges by the heating component 400 not only facilitates shaping the workpiece according to production requirements during processing but also ensures the hardness of the main body of the workpiece and its impact resistance and resistance to deformation.

[0032] It should be noted that in this embodiment, the workpiece is a hard material, specifically high-hardness aluminum, which softens when heated to 380 degrees Celsius; the specific grade is 5H59. In other embodiments, the workpiece can also be a hard aluminum alloy. In this embodiment, the upper mold assembly, lower mold assembly, punch, and die are all made of high-temperature resistant material, specifically chromium alloy steel, which maintains its hardness at 600 degrees Celsius; the specific grade is H13 hot work die steel. In some embodiments, the upper mold assembly, lower mold assembly, punch, and die can also be made of other high-temperature resistant materials.

[0033] Furthermore, referring to Figures 1-2 as well as Figures 5-6 The upper mold assembly 100 includes an upper mold base 110, an upper pad 120, and an upper clamping plate 130; the upper mold base 110, upper pad 120, and upper clamping plate 130 are arranged sequentially from top to bottom; the upper clamping plate 130 acts on the top surface of the workpiece; a concave mold 310 is provided on the side of the upper clamping plate 130 facing the lower mold assembly 200. Additionally, the lower mold assembly 200 includes a lower mold base 240, a lower base plate 230, a lower pad 220, and a lower template 210; the lower mold base 240, lower base plate 230, lower pad 220, and lower template 210 are arranged sequentially from bottom to top; a convex mold 320 is provided on the side of the lower template 210 facing the upper mold assembly 100; the lower template 210 cooperates with the upper clamping plate 130 to clamp the workpiece. In this embodiment, the upper die holder 110 is connected to an external stamping power mechanism to drive the upper die holder 110 to press down, thereby driving the upper pad 120 and the upper clamping plate 130 to press down, so that the concave die 310 in the upper clamping plate 130 and the convex die 320 in the lower template 210 cooperate to complete the stamping and forming of the workpiece.

[0034] In this embodiment, refer to Figure 3 There are four heating components 400, which are symmetrically arranged front-to-back and left-to-right around the punch 320. The symmetrical distribution of the four heating components 400 ensures more uniform heating of the workpiece edges, avoiding workpiece deformation or quality instability caused by uneven heating.

[0035] Furthermore, referring to Figures 1-2 as well as Figures 7-8The heating assembly 400 includes a fixing member 410, a pushing member 420, a movable member 430, and a heating element 440. The fixing member 410 is disposed on the side wall of the lower mold assembly 200 and extends away from the lower mold assembly 200; the pushing member 420 is disposed on the side of the fixing member 410 away from the lower mold assembly 200, with its telescopic end facing the punch 320; the movable member 430 is disposed on the telescopic end of the pushing member 420; and the heating element 440 is disposed on the movable member 430, specifically on the top surface of the movable member 430. Under the pushing or pulling action of the telescopic end of the pushing member 420, the movable member 430 causes the heating element 440 to move or retract towards the punch 320. Specifically, the fixing member 410 is fixedly installed on the side wall of the lower template 210, and the bottom surface of the fixing member 410 is at the same horizontal plane as the bottom surface of the lower template 210. The height of the fixing member 410 is lower than the height of the lower template 210, and the width of the fixing member 410 is greater than the sum of the width of the movable member 430 and the initial length of the telescopic end of the push member 420. Thus, when the telescopic end of the push member 420 retracts to pull the movable member 430 and the heating member 440 to move away from the punch 320 until it retracts and resets (its initial state is that the bottom surface of the movable member 430 is completely separated from the top surface of the lower template 210, and the telescopic end of the push member 420 is in a retracted state), it ensures that the movable member 430, the heating member 440 and the telescopic end of the push member 420 are completely separated from the top surface of the lower template 210, preventing unnecessary interference with the upper die assembly 100 or other components during the stamping process, which would affect the normal stamping process. In this embodiment, the heating element 440 is mounted on the movable element 430. The movable element 430 serves as insulation and heat insulation, preventing the heating element 440 from damaging the top surface of the lower mold plate 210 during movement and heating, thus ensuring the integrity of the lower mold plate 210 and affecting the subsequent mold closing accuracy. In other embodiments, the movable element 430 is detachably mounted on the telescopic end of the pusher 420; the heating element 440 is detachably mounted on the movable element 430, facilitating the replacement of the movable element 430 and the heating element 440 by production personnel according to the different heating and softening temperatures required for different workpiece materials.

[0036] In this embodiment, the pusher 420 is a reset cylinder. In other embodiments, the pusher 420 may also be a hydraulic cylinder. In this embodiment, the heating element 440 is a heating copper tube. In other embodiments, the heating element 440 may also be other heating elements. In some embodiments, a groove for the heating element 400 to be embedded may be provided on the lower mold assembly 200 around the punch 320. An insulating and heat-insulating layer is provided on the side and bottom surfaces of the groove to avoid damage to other parts of the lower mold assembly 200. When the workpiece is placed on the top surface of the punch 320, the opening of the groove (corresponding to the heating surface of the heating element 400) corresponds to the edge of the workpiece, ensuring that the edge of the workpiece can be locally heated and avoiding damage to other parts of the lower mold assembly 200.

[0037] In this embodiment, refer to Figure 5 The apparatus for local heating and stamping of hard workpieces further includes a guide and limiting component. This guide and limiting component is located between the upper die assembly 100 and the lower die assembly 200 to ensure the accuracy of the upper die assembly 100 when moving upwards to open the mold and downwards to close the mold relative to the lower die assembly 200, and to prevent excessive downward pressure that could damage the lower die assembly 200. Specifically, the guide and limiting component includes a guide limiting hole 510 and a guide limiting post 520. The guide limiting hole 510 is located on the side of the upper die assembly 100 facing the lower die assembly 200, and the guide limiting post 520 is located on the side of the lower die assembly 200 facing the upper die assembly 100 and extends upwards. The guide limiting hole 510 and the guide limiting post 520 cooperate to prevent excessive downward pressure on the upper die assembly 100 and to ensure the accuracy of the cooperation between the upper die assembly 100 and the lower die assembly 200. Specifically, the guide limiting hole 510 is opened on the upper clamping plate 130, and the guide limiting post 520 is disposed through the lower template 210 and the lower pad 220, protruding from the surface of the lower template 210 and extending towards the upper mold assembly 100.

[0038] In this embodiment, refer to Figures 4-5 The apparatus for local heating and stamping of rigid workpieces further includes a drive assembly 600, which is disposed at the bottom of the lower template 210 and located between the lower base plate 230 and the lower pad plate 220. The output end of the drive assembly 600 abuts against the bottom surface of the lower template 210 to move the lower template 210 vertically upward or downward. Specifically, the lower template 210 is embedded with a plunger that corresponds to and cooperates with the drive assembly 600. When the upper mold assembly 100 moves downward and closes with the lower mold assembly 200, the drive assembly 600 is activated. The output end of the drive assembly 600 cooperates with the plunger to drive the lower template 210 to move vertically upward, so that the lower template 210 further extrudes the workpiece, gradually increasing the thickness of the side wall of the workpiece to complete the upsetting treatment at the edge of the workpiece. Furthermore, there are two drive assemblies 600, which are symmetrically placed to ensure that both sides of the lower template 210 maintain the same rising height or the same falling height, thereby ensuring that the extrusion force on the workpiece is consistent and thus ensuring that the thickness of the workpiece edge is consistent. In this embodiment, the drive assembly 600 is a nitrogen spring. In some embodiments, the drive assembly 600 may also be a hydraulic cylinder.

[0039] In this embodiment, refer to Figures 7-8 The lower mold assembly 200 further includes: lower support feet 250 disposed on the bottom surface of the lower mold base 240; one or more lower support feet 250 are provided. The lower support feet 250 serve to increase the overall height of the mold and prevent the mold from being installed skewed. In this embodiment, multiple lower support feet 250 are provided, specifically three, which are equidistantly distributed on the bottom surface of the lower mold base 240. In some embodiments, only one lower support foot 250 may be provided.

[0040] The general workflow of this utility model is as follows: (Refer to...) Figures 1-4 as well as Figures 7-8 The workpiece blank is placed on the top surface of the punch 320. The pusher 420 is activated. Under the pushing action of the telescopic end of the pusher 420, the movable part 430 drives the heating element 440 to move towards the punch 320 until the side wall of the movable part 430 abuts against the side wall of the punch 320. The pusher 420 is then paused. At this time, the heating element 440 heats the edge of the workpiece until it softens. After the edge of the workpiece softens, the pusher 420 is activated again. The telescopic end of the pusher 420 retracts to pull the movable part 430, thereby retracting and resetting the movable part 430 and the heating element 440 to their original positions, ensuring that the movable part 430, the heating element 440, and the pusher 420 are properly aligned. The telescopic end completely disengages from the top surface of the lower mold plate 210, and the pusher 420 is closed. Then, the upper mold assembly 100 is closed vertically downwards. When the top of the guide limiting post 520 passes through the guide limiting hole 510 and abuts against the bottom surface of the upper pad 120, the movement of the upper mold assembly 100 stops. At this point, the upper mold assembly 100 and the lower mold assembly 200 are closed to complete the stamping. Subsequently, the drive assembly 600 is activated, and its output end abuts against the bottom surface of the lower mold plate 210, causing it to move vertically upwards along the guide limiting post 520. The lower mold plate 210 further extrudes the workpiece, gradually increasing the thickness of the workpiece's sidewalls to complete the upsetting process at the workpiece edges. This device for localized heating and stamping of hard workpieces not only effectively avoids workpiece breakage caused by cold stamping but also makes the workpiece easy to shape and maintains the hardness of the main body. Furthermore, this device can also perform upsetting on the sidewalls of the workpiece for further processing and assembly.

[0041] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An apparatus for locally heating and stamping hard workpieces, characterized in that, include: The lower mold assembly (200) has a punch (320) on its top side, and the upper surface of the punch (320) is used for placing the workpiece. An upper mold assembly (100) is arranged vertically above the lower mold assembly (200); the upper mold assembly (100) has a concave mold (310) on its side facing the lower mold assembly (200) to mate with the convex mold (320); and A heating assembly (400) is disposed on the lower mold assembly (200) and located on the periphery of the punch (320); When the workpiece is placed on the upper surface of the punch (320), the heating component (400) heats the edge of the workpiece to soften the edge of the workpiece, and the upper die component (100) moves downward to make the concave die (310) and the punch (320) close together to stamp the workpiece.

2. The apparatus for local heating and stamping of hard workpieces according to claim 1, characterized in that, The heating components (400) are provided in four parts.

3. The apparatus for local heating and stamping of hard workpieces according to claim 2, characterized in that, The heating assembly (400) includes: a fixing member (410) disposed on the side wall of the lower mold assembly (200) and extending away from the lower mold assembly (200); a pushing member (420) disposed on the side of the fixing member (410) away from the lower mold assembly (200) and with its telescopic end facing the punch (320); a movable member (430) disposed on the telescopic end of the pushing member (420); and a heating element (440) disposed on the movable member (430); under the pushing or pulling action of the telescopic end of the pushing member (420), the movable member (430) drives the heating element (440) to move or retract toward the punch (320).

4. The apparatus for local heating and stamping of hard workpieces according to claim 1, characterized in that, The apparatus for local heating and stamping of hard workpieces further includes a guide and limiting component, which is located between the upper die assembly (100) and the lower die assembly (200).

5. The apparatus for local heating and stamping of hard workpieces according to claim 4, characterized in that, The guide limiting component includes: a guide limiting hole (510) formed on the side of the upper mold assembly (100) facing the lower mold assembly (200) and a guide limiting post (520) disposed on the side of the lower mold assembly (200) facing the upper mold assembly (100) and extending upward; the guide limiting hole (510) and the guide limiting post (520) cooperate to avoid the upper mold assembly (100) being pressed down excessively.

6. The apparatus for locally heating and stamping hard workpieces according to any one of claims 1-5, characterized in that, The upper mold assembly (100) includes: an upper mold base (110), an upper pad (120), and an upper clamping plate (130) acting on the top surface of the workpiece, arranged sequentially from top to bottom; the upper clamping plate (130) has the concave mold (310) arranged on the side facing the lower mold assembly (200).

7. The apparatus for local heating and stamping of hard workpieces according to claim 6, characterized in that, The lower mold assembly (200) includes: a lower mold base (240), a lower base plate (230), a lower pad plate (220), and a lower template (210) arranged sequentially from bottom to top; the lower template (210) has the punch (320) arranged on the side facing the upper mold assembly (100); the lower template (210) cooperates with the upper clamping plate (130) to clamp the workpiece.

8. The apparatus for local heating and stamping of hard workpieces according to claim 7, characterized in that, The apparatus for local heating and stamping of hard workpieces further includes: a drive assembly (600) disposed at the bottom of the lower template (210) and located between the lower base plate (230) and the lower pad plate (220); the output end of the drive assembly (600) abuts against the bottom surface of the lower template (210) to make the lower template (210) move upward or downward in the vertical direction.

9. The apparatus for local heating and stamping of hard workpieces according to claim 8, characterized in that, There are two drive components (600), which are placed symmetrically.

10. The apparatus for local heating and stamping of hard workpieces according to claim 7, characterized in that, The lower mold assembly (200) further includes: a lower pad (250) disposed on the bottom surface of the lower mold base (240); the lower pad (250) is provided with one or more.

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