A notebook computer shell composite reverse-docking aluminum plate stamping device

Abstract

The application discloses a notebook computer shell composite reverse clamping aluminum plate stamping device, which comprises a die base plate, a top plate, an outer guide rod, a movable die assembly, a fixed die assembly and a hydraulic cylinder, the fixed die assembly comprises a die outer sleeve base, a fixed die inner sleeve base, an outer turning assembly and a fixed die middle bearing, the fixed die middle bearing is matched and sleeved in the fixed die inner sleeve base, the fixed die inner sleeve base is matched and sleeved in the die outer sleeve base, the outer turning assembly comprises a guide square sleeve, a fixed plate and a linkage assembly, the movable die assembly comprises a movable die base, a movable die sleeve, wedge-shaped sliding blocks and an inner turning assembly, the movable die base comprises a rectangular disc body, the center upper part of the rectangular disc body is fixed with a push rod of the hydraulic cylinder, the center lower part of the rectangular disc body is fixed with a four-pyramid pressure head, four wedge-shaped sliding blocks are arranged below the bottom plate of the movable die sleeve, and the horizontal guide columns of the wedge-shaped sliding blocks are matched and inserted into corresponding horizontal guide holes.

Description

Technical Field

[0001] This invention belongs to the technical field of notebook shell stamping mold equipment, specifically relating to an aluminum plate stamping processing device for composite undercut notebook shells. Background Technology

[0002] Laptop internal supports are mostly made of plastic, or a composite of plastic and metal. The internal support clips are typically plastic clips, integrally molded with the internal support. Existing technologies largely focus on improving mold solutions for the molding and demolding of the internal support and plastic clips. While the structure of these molds can vary greatly due to differences in plastic type and properties, the shape and structure of the plastic product, and the type of injection molding machine, the basic structure remains consistent. Molds mainly consist of a gating system, a temperature control system, molding parts, and structural parts. The gating system and molding parts are the parts in direct contact with the plastic and vary depending on the plastic and the product; they are the most complex, variable, and require the highest surface finish and precision in the mold. Injection molds consist of a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and cavity; during mold opening, the moving and fixed molds separate to remove the plastic product.

[0003] During injection molding and demolding of many plastic parts, the issue of undercuts often arises. Some plastic parts have numerous flanges and undercuts for assembly purposes, with these undercut structures located on the front and sides of the product. Therefore, the corresponding molds typically have multiple undercut release structures corresponding to different undercut release directions. A commonly used mold structure is the external parting line, usually featuring large straight ejectors and large angled ejectors, along with a slider to disengage the product from the undercuts. A disadvantage of this type of structure is exposed seams, affecting the appearance.

[0004] Existing technologies lack a composite undercut solution for metal and plastic inverted joints formed by combining a metal plate with an inner frame. In one existing notebook brand product structure, the shell includes a plate-shaped metal component and two strip-shaped plastic components, bonded together with AB glue. A notebook computer shell negative angle undercut fixture, disclosed in CN 213108272 U, includes an upper hot-pressing plate and a lower positioning mechanism. The positioning mechanism includes a base, a support platform located in the middle of the base, two inward-pushing cylinders symmetrically arranged on both sides of the middle of the support platform, and two outward-pushing cylinders symmetrically arranged on both sides of the support platform. The inward-pushing cylinders drive the inner clamping plate outward, and the outward-pushing cylinders drive the outer clamping plate inward. The inner and outer clamping plates are horizontally opposite each other. A positioning platform is provided on the outer edge of the inner clamping plate, and the support platform is located within the downward projection range of the hot-pressing plate. Research has found that this solution uses an internal thrust cylinder to drive an internal clamping plate so that the plastic part is snapped onto the edge of the metal part from a negative angle, forming a composite negative snap structure with both plastic and metal parts. Summary of the Invention

[0005] To address the issue of low strength in plastic undercuts for laptop inner frames and the lack of composite undercut solutions combining metal plates and inner frames in existing technologies, this invention provides an aluminum plate stamping device for composite undercuts on laptop shells. The objectives are: first, to stamp the various stamping blanks around the annular aluminum plate in the composite undercut of the laptop shell, and to ensure smooth stamping and demolding of the moving and fixed mold components; second, to provide precise positioning for the assembly of the annular aluminum plate, enabling rapid and accurate assembly and disassembly, thus improving production efficiency; and third, to ensure a delayed detachment of the annular aluminum plate from the fixed mold component, ensuring that the annular aluminum plate detaches from the moving mold component first before detaching from the fixed mold component, thereby preventing additional damage caused by the moving mold component lifting the annular aluminum plate.

[0006] The solution adopted by this invention to solve its technical problem is: a stamping processing device for composite undercut aluminum plates of a notebook shell, comprising a mold base plate, a top plate, an outer guide rod, a moving mold assembly, a fixed mold assembly, and a hydraulic cylinder. The fixed mold assembly includes an outer mold base, an inner mold base, an outward-turning assembly, and a middle mold support. The middle mold support is fitted into the inner mold base, and the inner mold base is fitted into the outer mold base. The outer mold base is a rectangular frame structure, including four side walls and an annular base plate at the bottom of the four side walls. The area inside the annular base plate is the central square hole of the outer mold base. The inner surfaces of the four side walls are respectively provided with inwardly recessed relief grooves, and the bottom of each relief groove has a slope. The inner mold base is a rectangular frame structure, and the inner mold base is fitted into the outer mold base. Each side wall of the base is provided with a through hole and equipped with an outward-turning assembly. The outward-turning assembly includes a guide sleeve, a fixing plate, and a linkage assembly. The outer surface of the guide sleeve is cylindrical, and a rectangular central through hole is provided in the axial position. The linkage assembly can be fitted into the rectangular central through hole and can slide. The linkage assembly includes a push-pull rod, an outward-turning mold rod, and a wedge-shaped push head. The front end of the push-pull rod is hinged to the outward-turning mold rod through a rotating shaft, and the rear end of the push-pull rod is fixedly connected to the wedge-shaped push head. The lower rear side of the wedge-shaped push head has an outer inclined surface. The fixed mold support includes a rectangular support plate, and a central guide rod is vertically fixed at the center of its bottom. A central guide hole is provided in the center of the fixed mold base plate, and the central guide rod is fitted into the central guide hole. The moving mold assembly includes a moving mold base, a moving mold sleeve, wedge-shaped sliders, and an inward-turning assembly. The moving mold base consists of a rectangular disc, with its upper center fixed to the push rod of the hydraulic cylinder and its lower center fixed to a four-sided pyramidal pressure head. Through holes are provided around the disc, and inner guide rods are installed through each hole. The moving mold sleeve is a rectangular structure, including four side walls and a base plate. The base plate has a central square hole, and each side wall of the central square hole has a recessed transverse guide hole. Vertical guide holes are provided along the edges of the base plate. Spiral grooves are provided at the outer corners where the base plate intersects with the side walls. Four triangular wedge-shaped sliders are sequentially joined to form a rectangular shape. The assembly, a rectangular assembly, is fitted within the central square hole area. Each wedge-shaped slider includes an outer base plate portion and an inner wedge-shaped body portion, the wedge-shaped body portion being higher than the base plate portion. The base plate has a transverse sliding hole in its center, which matches and fits with the inner guide rod, allowing the inner guide rod to slide outwards or inwards within the transverse sliding hole. An inclined surface is provided at the upper inner end of the wedge-shaped body portion, which matches and engages with an inclined surface of the square pyramid indenter. The inward-flipping assembly includes an outwardly extending inward-flipping support at the outer edge of the base plate portion. Each inward-flipping support has multiple slots, each slot containing a shaft hole and mounting a pin. An inward-flipping mold rod is hinged to each pin. The moving mold base is fitted within the inner cavity of the moving mold sleeve.The wedge-shaped sliders are fitted into the central square hole of the moving mold sleeve, and the four wedge-shaped sliders are respectively located below the bottom plate of the moving mold sleeve. Simultaneously, the transverse guide posts of each wedge-shaped slider are inserted into their corresponding transverse guide holes.

[0007] The fixed mold inner sleeve is a rectangular frame structure. Vertical inner sleeve guide strips are spaced apart on the inner surface of each side wall around it, and an inner sleeve bottom stop is located at the bottom of each inner sleeve guide strip. At the same time, a series of outer guide grooves are spaced apart on each of the four side walls of the bearing plate. An outer stop is located on the upper side of each outer guide groove. When the fixed mold middle support is fitted into the inner side of the fixed mold inner sleeve, the inner sleeve guide strips and outer guide grooves are fitted together. The fixed mold middle support and the fixed mold inner sleeve slide through the corresponding guide grooves and guide strips. When the sliding reaches the limit position, the inner sleeve bottom stop and the outer stop contact to restrict further sliding.

[0008] There is a clearance groove on the lower front side of the central through hole of the guide sleeve, and an inner retaining ring on the rear side of the central through hole. An inner spring is installed in the inner retaining ring. There is an outer stop on the rear side of the guide sleeve, and an outer spring is installed on the front side of the outer stop. The guide sleeve is fitted into the through hole on the side wall of the fixed mold inner sleeve seat and is fixed by a fixing plate. The center of the fixing plate is also provided with a central hole, and the linkage component is also fitted into the central hole.

[0009] Each inner guide rod has a guide block fixed at its bottom. The width of the guide block is greater than the width of the inner guide rod. Each wedge-shaped slider has a horizontal sliding hole and a horizontal sliding groove in the middle of its base plate. The horizontal sliding hole is fitted with the inner guide rod, and the horizontal sliding groove is fitted with the guide block, so that the inner guide rod and the guide block can slide outward or inward in the horizontal sliding hole and the horizontal sliding groove, respectively.

[0010] On the vertical surface of the wedge-shaped part of the wedge slider, there are horizontal guide posts fixed vertically. Each horizontal guide post is matched and fitted into the corresponding horizontal guide hole. At the same time, a thrust spring is fitted on the outside of each horizontal guide post to drive the wedge slider to move inward.

[0011] Each inward turning mold rod in the inward turning assembly is a rectangular strip with a sloping surface that is wider at the top and narrower at the bottom at its outer end, and a shaft hole at its inner end.

[0012] When the moving mold base is driven downward by the hydraulic cylinder, the positions of each part of the moving mold assembly remain unchanged before the four wedge sliders contact the fixed mold assembly. When the moving mold base continues to move downward and the four wedge sliders contact the fixed mold assembly, the four-sided pyramidal pressure head moves downward, thereby driving the four wedge sliders to move outward, that is, the four wedge sliders expand outward.

[0013] A thrust spring is fitted on the outside of the inner guide rod; or, a pad is fitted on the outside of the inner guide rod, the pad being able to change the degree of descent of the four-sided pyramid indenter, thereby changing the degree of outward movement of the four wedge-shaped sliders.

[0014] Guide sleeves are provided at the four top corners of the outer side of the fixed mold outer sleeve of the fixed mold assembly, and are respectively fitted and fixed to the outer guide pillars of the mold body. The bottom of each outer guide pillar is fixed to the four top corners of the fixed mold base plate, and the fixed mold outer sleeve is fixed to the upper side of the fixed mold base plate.

[0015] After the fixed mold inner sleeve is fitted inside the fixed mold outer sleeve, the wedge-shaped pusher at the outer end of the outward-turning component pops outward and extends into the clearance groove of the fixed mold outer sleeve; after the fixed mold middle support is fitted inside the fixed mold inner sleeve, the inner sleeve guide strip and the outer guide groove are fitted together; when the fixed mold middle support moves downward, the fixed mold inner sleeve and the fixed mold middle support can slide relative to each other; when the inner sleeve bottom stop and the outer stop contact each other, the two no longer slide relative to each other, but move downward synchronously; the downward movement of the fixed mold inner sleeve drives the outward-turning component to move downward together, so that the wedge-shaped pusher at the outer end of the outward-turning component moves downward, thereby causing the outer inclined surface to slide on the inclined surface of the fixed mold outer sleeve, thereby driving the outward-turning component to move inward laterally.

[0016] The moving mold assembly works in conjunction with the fixed mold assembly to stamp the various undercut stamping blanks around the annular aluminum plate.

[0017] Initially, the moving mold assembly is positioned on the upper side, with a gap between it and the fixed mold assembly. An annular aluminum plate is placed at the center of the upper side of the fixed mold assembly. Preferably, the annular aluminum plate has multiple positioning holes, and a series of slightly protruding positioning posts are located on the upper side of the fixed mold bearing of the fixed mold assembly, ensuring that the positioning holes and positioning posts fit together and that the annular aluminum plate is accurately centered.

[0018] The moving mold assembly and the fixed mold assembly are in initial contact; the moving mold assembly is in its state before deformation.

[0019] The moving mold assembly and the fixed mold assembly continue to move downwards. At this point, only the four-sided pyramidal pressure head moves downwards, driving the four wedge-shaped sliders to move slightly outwards a distance to ensure that the outer edge of each wedge-shaped slider is close to the edge of the fixed mold support in the fixed mold assembly (the distance difference is the thickness of the annular aluminum plate). At this time, the transverse sliding hole and transverse sliding groove respectively play a positioning role for the inner guide rod and guide block to ensure that each wedge-shaped slider extends outwards to the appropriate position.

[0020] The hydraulic cylinder further drives the moving mold base to move. At this time, the moving mold assembly remains unchanged, while the fixed mold assembly begins to move.

[0021] The moving mold assembly presses against the annular aluminum plate, which in turn presses against the fixed mold assembly's fixed mold support, causing it to move downwards. At this time, the fixed mold inner sleeve does not move downwards (because the outward-turning assembly cannot move inwards, and its outer end is locked to the fixed mold outer sleeve, the fixed mold inner sleeve will not move downwards). Supported by the inner wall of the fixed mold inner sleeve, the surrounding undercut stamping blanks flip upwards as shown in the diagram. At this point, the inner-turning die rods hinged to the outer edge of the wedge-shaped slider are driven by their corresponding undercut stamping blanks, naturally flipping upwards. However, the inner-turning support is equipped with inclined stop plates that constrain the inner-turning die rods from continuing to flip upwards.

[0022] The hydraulic cylinder continues to drive the above components to move downwards, causing the fixed mold middle support to continue to move downwards. After the outer stop of the fixed mold middle support contacts the inner bottom stop of the fixed mold inner sleeve, the two can no longer slide relative to each other. At this time, the fixed mold middle support and the fixed mold inner sleeve are connected and move downwards together, as shown in the figure. The fixed mold middle support and the fixed mold inner sleeve move downwards to the position of the outward-turning component.

[0023] Furthermore, when the fixed mold support and the fixed mold inner sleeve move downwards beyond the position of the outward-turning component, the outward-turning component slides in the clearance groove of the fixed mold outer sleeve because the fixed mold inner sleeve moves downwards while the fixed mold outer sleeve remains stationary. That is, the outer inclined surface of the outward-turning component slides between the inclined surface of the fixed mold outer sleeve and the outer inclined surface of the fixed mold outer sleeve. This sliding causes the outward-turning component to move inwards as a whole.

[0024] When the outward-turning assembly moves outward, the guide sleeve first applies pressure to the upper end of the undercut stamping blank, causing it to bend, as shown in the middle of the figure. Then, the outward-turning die rod is supported by the spiral groove and becomes bent. The bent outward-turning die rod presses down from the top to the end of the undercut stamping blank, causing it to be bent on the upper side of the inward-turning die rod, forming an undercut.

[0025] Return process: The hydraulic cylinder lifts upwards, and under the action of the return spring, the fixed mold assembly and the moving mold assembly move upwards together. First, the inner sleeve of the fixed mold begins to slide upwards relative to the outer sleeve of the fixed mold. Under the action of the outer and inner springs, the outward-folding assembly pops outwards, that is, the outer end of the outward-folding assembly enters the clearance groove, and the inner end of the outward-folding assembly retracts into the through hole.

[0026] Then the bearing in the fixed mold begins to slide upward relative to the inner sleeve of the fixed mold until it stops after the return spring reaches its limit.

[0027] Under the action of the hydraulic cylinder, only the moving mold assembly continues to move upward. At this time, the moving mold base drives the four-sided pyramidal pressure head to move upward, contacting the top pressure on the four wedge-shaped sliders. Under the action of their return springs (there are return springs on the outside of the horizontal guide post), each wedge-shaped slider retracts inward. The inward movement of each wedge-shaped slider pulls each inner mold rod inward. At this time, the annular aluminum plate disengages from the moving mold assembly.

[0028] The hydraulic cylinder continues to move upward, causing the moving mold assembly to separate from the fixed mold assembly, and the annular aluminum plate with peripheral undercuts is removed.

[0029] This invention provides a design for stamping barbs around the annular aluminum plate in a composite buckle for a laptop shell to form barbs, as well as a special design required for the moving mold assembly and the fixed mold assembly to perform stamping and demolding.

[0030] The fixed mold assembly is a set of interconnected lower mold bodies. Only the outer mold sleeve and the mold base plate are fixed within the fixed mold assembly, making them stationary components. The inner mold sleeve and the middle mold support are linked mold components. The movement of the linked mold assembly drives the outward-turning assembly to stamp the undercut blanks from the outside. The moving mold assembly is entirely linked. When the moving mold base is driven downward by the hydraulic cylinder, the positions of each part of the moving mold assembly remain unchanged before the four wedge-shaped sliders contact the fixed mold assembly. As it continues to move downward until the four wedge-shaped sliders contact the fixed mold assembly, the four-sided pyramidal pressure head moves downward, thereby driving the four wedge-shaped sliders to move outward, i.e., the four wedge-shaped sliders expand outward, stamping the undercut blanks from the inside. This allows for simultaneous stamping of multiple undercut blanks on the four outer edges of the annular aluminum plate from both the inside and outside using both the outward-turning and inward-turning assemblies, as well as smooth demolding in the reverse direction.

[0031] Another method provides a combination of square protrusions with adjustable width added to the center area of ​​the top of the bearing in the fixed mold. When the stamping process is under pressure from the pyramidal indenter, the combination of square protrusions expands outward and supports the four sides of the hollow part of the annular aluminum plate to ensure that the annular aluminum plate is supported and fixed in the standard position.

[0032] In another embodiment, when the center rod and wedge head are in the rising phase, the annular aluminum plate is always in a constrained state within this time difference range, that is, it is supported by multiple sliders and cannot be released. This ensures that the annular aluminum plate will not be hung up with the moving mold assembly, thereby solving the problem that when the moving mold assembly moves upward, the annular aluminum plate is in an unconstrained free state and may be hung up by an inner flip mold rod on one side, causing the annular aluminum plate to rise with the moving mold assembly and easily fall and collide. Attached Figure Description

[0033] Figure 1 This is an external view of the aluminum plate stamping processing device of the present invention.

[0034] Figure 2 yes Figure 1 Appearance diagram of the stamping state.

[0035] Figure 3 yes Figure 1 Diagram showing the fit and connection between the moving mold assembly and the fixed mold assembly in the device.

[0036] Figure 4 This is a diagram showing the arrangement of the annular aluminum plates before stamping.

[0037] Figure 5 yes Figure 1 Middle HH cross section (internal structure of moving mold assembly and fixed mold assembly) diagram.

[0038] Figure 6 yes Figure 5 Enlarged structural diagram of section A in the middle.

[0039] Figure 7 yes Figure 5 Diagram showing the combined state of the moving mold assembly and the fixed mold assembly.

[0040] Figure 8 yes Figure 7 Enlarged structural diagram of section B in the middle.

[0041] Figure 9 This is a schematic diagram of the initial state of the moving mold assembly and the fixed mold assembly.

[0042] Figure 10 This is a schematic diagram of the initial contact state between the moving mold assembly and the fixed mold assembly.

[0043] Figure 11 This is a schematic diagram of the deformation of the moving mold assembly under pressure.

[0044] Figure 12 This is a schematic diagram of the pressure movement of the bearing in the fixed mold assembly.

[0045] Figure 13 This is a schematic diagram of the pressure movement of the inner sleeve of the fixed mold assembly.

[0046] Figure 14 This is a schematic diagram of the outward-folding component under pressure in the fixed mold assembly.

[0047] Figure 15 yes Figure 10 Enlarged structural diagram of section C.

[0048] Figure 16 yes Figure 11 Enlarged structural diagram of section D in the middle.

[0049] Figure 17 yes Figure 12 Enlarged structural diagram of section E in the middle.

[0050] Figure 18 yes Figure 13 Enlarged structural diagram of the middle F section.

[0051] Figure 19 yes Figure 14 Enlarged structural diagram of the middle G section.

[0052] Figure 20This is a schematic diagram of the characteristic movement process of the outward folding component.

[0053] Figure 21 This is a side view of the moving mold base.

[0054] Figure 22 These are the sectional and top views of the moving mold sleeve.

[0055] Figure 23 This is a wedge slider view in all directions.

[0056] Figure 24 These are the sectional and top views of the bearing seat in the fixed mold.

[0057] Figure 25 This is a sectional view of the inner sleeve of the fixed mold.

[0058] Figure 26 This is an assembly structure diagram of the outward-folding component.

[0059] Figure 27 These are sectional and top views of the mold outer sleeve.

[0060] Figure 28 This is a cross-sectional and top view of another type of mold outer sleeve.

[0061] Figure 29 This is another type of sectional and top view of a mold outer sleeve.

[0062] Figure 30 yes Figure 29 A schematic diagram of the cyclic motion of the central rod and wedge head.

[0063] Numbering in the diagram: 1. Fixed mold base plate; 2. Top plate; 3. Outer guide rod; 4. Moving mold assembly; 5. Fixed mold assembly; 6. Hydraulic cylinder; 7. Moving mold base; 8. Four-sided pyramidal pressure head; 9. Inner guide rod; 10. Guide block; 11. Moving mold sleeve; 12. Sleeve inner cavity; 13. Vertical guide hole; 14. Horizontal guide hole; 15. Central square hole; 16. Spiral groove; 17. Wedge-shaped slider; 18. Horizontal sliding hole; 19. Horizontal sliding groove; 20. Horizontal guide post; 21. Inclined surface; 22. Inward turning support; 23. Inward turning mold rod; 24. Pin; 25. Fixed mold outer sleeve; 26. Outer sleeve inner cavity; 27. Outer sleeve central square hole; 28. Relief groove; 29. ​​Inclined surface; 30. Fixed mold inner sleeve. The following components are included: inner sleeve cavity 31, inner sleeve guide strip 32, inner sleeve bottom stop 33, outward turning assembly 34, guide square sleeve 35, outer stop ring 36, outer spring 37, inner stop ring 38, inner spring 39, center through hole 40, clearance groove 41, fixing plate 42, center hole 43, push-pull rod 44, outward turning mold rod 45, wedge-shaped push head 46, outer inclined surface 47, rotating shaft 48, fixed mold middle support 49, four-sided positioning groove 50, outer guide groove 51, outer stop 52, center guide rod 53, center guide hole 54, reset spring 55, annular aluminum plate 56, undercut stamped blank 57, pad plate 58. Detailed Implementation

[0064] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0065] To achieve a composite undercut design for a laptop casing, the first step is to stamp an aluminum sheet to create multiple metal undercuts around the perimeter of the annular aluminum sheet. These undercuts are then injection molded and either combined with the internal support frame, or separately fixed to the perimeter of the internal support frame, interlocking with the plastic undercuts to form a composite undercut, thus increasing the undercut strength. The main processes include stamping an aluminum sheet to form a rectangular ring frame with a 45-degree bevel at the bottom edge, stamping the ring frame to form the undercuts, and injection molding to form the composite undercut.

[0066] To achieve such Figure 4 The undercut stamping blanks 57 around the central annular aluminum plate 56 are stamped to form undercuts. This requires all the undercut stamping blanks 57 to simultaneously change from horizontal to vertical, and then to form undercuts. Since all the undercuts converge inward after being formed, the stamping and demolding of the moving mold assembly 4 and the fixed mold assembly 5 require special design. Example

[0067] Adopt a method such as Figure 1 The aluminum plate stamping processing device shown mainly includes a mold base plate 1, a top plate 2, an outer guide rod 3, a moving mold assembly 4, a fixed mold assembly 5, and a hydraulic cylinder 6.

[0068] The moving mold assembly includes a moving mold base 7, a moving mold sleeve 11, a wedge-shaped slider 17, and an inward-turning component, etc. The fixed mold assembly 5 includes a mold outer sleeve 25, a fixed mold inner sleeve 30, an outward-turning component 34, and a fixed mold middle support 49.

[0069] Specifically, the mold outer seat 25, such as Figure 24 As shown, it has a rectangular frame structure, including four side walls and an annular base plate at the bottom of the four side walls. The area inside the four side walls is the inner cavity 26 of the outer sleeve, and the area inside the annular base plate is the central square hole 27 of the outer sleeve.

[0070] Figure 24 As can be seen in the figure, recessed relief grooves 28 are provided on the inner surfaces of the four side walls, and each relief groove 28 has a slope 29 at its bottom. A series of relief grooves 28 are shown in the figure on the inner surfaces of the four side walls.

[0071] Fixed mold inner sleeve 30 Figure 25 As shown, the overall structure is a rectangular frame, including four side walls. Vertical inner guide strips 32 are provided at intervals on the inner surface of each side wall, and an inner bottom stop 33 is provided at the bottom of each inner guide strip 32.

[0072] Figure 25As can be seen, each side wall of the fixed mold inner sleeve 30 is provided with a through hole and is equipped with an outward-turning component 34.

[0073] Outward-folding component 34, etc. Figure 26 As shown, it includes a guide sleeve 35, a fixing plate 42, and a linkage assembly. Among them,

[0074] The outer surface of the guide sleeve 35 is cylindrical, and a central through hole 40 is provided in the axial position. The central through hole is rectangular, and the linkage component can be fitted into the rectangular central through hole and can slide.

[0075] Specifically, there is a clearance groove 41 on the lower part of the front side of the central through hole of the guide sleeve 35, an inner retaining ring 38 on the rear side of the central through hole, an inner spring 39 is fitted in the inner retaining ring 38, and an outer stop 36 is on the rear part of the outer side of the guide sleeve 35, an outer spring 37 is fitted in front of the outer stop 36.

[0076] The guide sleeve 35 is fitted into the through hole on the side wall of the fixed mold inner sleeve 30 and is fixed by the fixing plate 42. The fixing plate 42 also has a center hole 43, and the linkage component is also fitted into the center hole 43.

[0077] The aforementioned linkage component, from Figure 26 As can be seen, it mainly includes a push-pull rod 44, an outward-turning mold rod 45, and a wedge-shaped push head 46. The front end of the push-pull rod 44 is hinged to the outward-turning mold rod 45 via a pivot 48, and the rear end of the push-pull rod 44 is fixedly connected to the wedge-shaped push head 46, which has an outer inclined surface 47 on its lower rear side.

[0078] Fixed mold middle bearing 49,

[0079] like Figure 27 As shown, the device includes a rectangular support plate with a central guide rod 53 vertically fixed at its bottom center. As can be seen in the figure, a series of outer guide grooves 51 are spaced apart on each of the four side walls of the support plate, and an outer baffle 52 is located on the upper side of each outer guide groove 51.

[0080] Assembly relationship of fixed mold component 5:

[0081] The fixed mold middle support 49 is fitted into the fixed mold inner sleeve 30, and the fixed mold inner sleeve 30 is fitted into the fixed mold outer sleeve 25.

[0082] Specifically, such as Figure 5 As shown, after the inner mold sleeve 30 is fitted into the inner side of the outer mold sleeve 25, the wedge-shaped push head 46 at the outer end of the outward-turning component 34 pops outward and extends into the relief groove 28 of the outer mold sleeve 25.

[0083] After the fixed mold middle support 49 is fitted inside the fixed mold inner sleeve 30, the inner sleeve guide strip 32 is fitted with the outer guide groove 51.

[0084] The fixed mold outer sleeve 25, the fixed mold inner sleeve 30, and the fixed mold middle support 49 are assembled in sequence and can slide relative to each other.

[0085] Sliding fit relationship:

[0086] When the fixed mold middle support 49 moves downward, the fixed mold inner sleeve 30 and the fixed mold middle support 49 can slide relative to each other. When the inner sleeve bottom stop 33 contacts the outer stop 52, the two no longer slide relative to each other, but move downward synchronously.

[0087] When the fixed mold inner sleeve 30 moves downward, it drives the outward-turning assembly 34 to move downward as well. This causes the wedge-shaped pusher 46 at the outer end of the outward-turning assembly 34 to move downward, which in turn causes the outer inclined surface 47 to slide on the inclined surface 29 of the fixed mold outer sleeve 25, thereby driving the outward-turning assembly 34 to move inward laterally. Since several movable outward-turning assemblies 34 are distributed on each side wall of the fixed mold inner sleeve 30, when the fixed mold inner sleeve 30 moves downward, it can simultaneously drive all the outward-turning assemblies 34 to move inward together.

[0088] It should be noted that when all the outward-folding components 34 move inward, the fixed mold support 49 has already slid downward to the bottom of the fixed mold inner sleeve 30. At this time, it does not prevent each outward-folding component 34 from extending inward; that is, after each outward-folding component extends inward, it is located above the fixed mold support 49. However, when the fixed mold support 49 is located at the upper part of the fixed mold inner sleeve 30, the inner ends of all the outward-folding components 34 are supported by the outer wall of the fixed mold support 49 and cannot pop out. Figure 6 The image shows the outer guide groove 51 located on the outer wall of the bearing 49 in the fixed mold. All the outer guide grooves 51 are staggered with the outward-turning components 34, so that the inner end of the outward-turning components cannot enter the outer guide groove 51 or even partially. Alternatively, the width of the outer guide groove 51 can be set to be significantly smaller than the width of the outward-turning components, so that the outward-turning components 34 and the outer guide groove 51 do not interfere with each other.

[0089] Assembly of fixed mold component 5, such as Figure 3 As shown, guide sleeves are provided at the four top corners of the outer side of the fixed mold outer sleeve seat 25 of the fixed mold assembly 5, and are respectively fitted and fixed to the outer guide pillars 3 of the mold body.

[0090] Figure 3 In this design, the bottom of each outer guide post 3 is fixed to the four top corners of the fixed mold base plate 1, and the fixed mold outer sleeve 25 is fixed to the upper side of the fixed mold base plate 1. A central guide hole 54 is provided in the center of the fixed mold base plate 1, and the central guide rod 53 is fitted into the central guide hole 54. A return spring 55 is fitted on the outside of the central guide rod 53.

[0091] Based on the above structure, it can be seen that the fixed mold assembly 5 is a linked lower mold body that is nested together. Only the fixed mold outer sleeve 25 is fixed to the fixed mold base plate 1 in the fixed mold assembly, which is a fixed part. The fixed mold inner sleeve 30 and the fixed mold middle support 49 are linked mold assemblies.

[0092] Dynamic module component 4, such as Figure 5 As shown, it includes a moving mold base 7, a moving mold sleeve 11, and a wedge-shaped slider 17.

[0093] like Figure 21 The moving mold base 7 shown includes a rectangular disc, the upper part of which is fixed to the push rod of the hydraulic cylinder 6, and the lower part of which is fixed to a four-sided pyramidal pressure head 8. Through holes are provided around the disc, and inner guide rods 9 are installed through them. A guide block 10 is fixed to the bottom of each inner guide rod 9, and the width of the guide block 10 is greater than the width of the inner guide rod 9.

[0094] Moving mold base 11 Figure 22 As shown, it has a rectangular structure, including four side walls and a bottom plate. The inner side of each side wall is a sleeve cavity 12. The bottom plate has a central square hole 15. Each side wall of the central square hole has a recessed horizontal guide hole 14. The four edges of the bottom plate are provided with vertically penetrating vertical guide holes 13.

[0095] Figure 22 It can also be seen that spiral grooves 16 are provided at the outer top corners where the base plate meets the surrounding side walls.

[0096] wedge slider 17 Figure 23 As shown, four wedge-shaped sliders 17 are sequentially connected to form a rectangular assembly, which is fitted into the area of ​​the central square hole 15. The structure of each wedge-shaped slider 17 is shown in the figure, including a base plate and a wedge-shaped body. The height of the wedge-shaped body is higher than that of the base plate. The base plate has a horizontal sliding hole 18 and a horizontal sliding groove 19 in the middle. The horizontal sliding hole 18 is fitted with the inner guide rod 9, and the horizontal sliding groove 19 is fitted with the guide block 10, so that the inner guide rod 9 and the guide block 10 can slide outward or inward in the horizontal sliding hole 18 and the horizontal sliding groove 19, respectively.

[0097] On the vertical surface of the wedge-shaped part, there are horizontal guide posts 20 fixed vertically, and each horizontal guide post 20 is matched and fitted into the corresponding horizontal guide hole 14.

[0098] An inclined surface 21 is provided at the upper inner end of the wedge-shaped part, which matches and connects with an inclined surface of the square pyramid indenter 8.

[0099] The outer edge of the base plate has outwardly extending inwardly folding supports 22. Each inwardly folding support 22 has multiple slots, each slot containing a shaft hole and mounting a pin 24. Each pin is hinged to an inwardly folding mold rod 23. For example... Figure 23 The inner mold rod 23 is a rectangular strip with a sloping surface that is wider at the top and narrower at the bottom at the outer end, and a shaft hole at the inner end.

[0100] Assembly relationship of moving mold component 4:

[0101] like Figure 5 As shown, the moving mold base 7 is fitted into the inner cavity 12 of the moving mold sleeve 11, and the wedge-shaped slider 17 is fitted into the central square hole 15 of the moving mold sleeve 11. At the same time, the transverse guide post 20 of each wedge-shaped slider 17 is inserted into the corresponding transverse guide hole 14.

[0102] The inner guide rod 9 and the guide block 10 are respectively fitted into the corresponding horizontal sliding hole 18 and horizontal sliding groove 19, so that they can slide outward or inward.

[0103] The four inclined surfaces of the quadrangular pyramid indenter 8 are respectively supported on the inclined surfaces 21 of the wedge-shaped slider 17.

[0104] from Figure 5 As can be seen, the four wedge-shaped sliders 17 are located below the base plate of the moving mold sleeve 11.

[0105] Therefore, when the moving mold base 7 is driven downward by the hydraulic cylinder, the positions of each part of the moving mold assembly 4 remain unchanged before the four wedge-shaped sliders 17 contact the fixed mold assembly 5. When the downward movement continues and the four wedge-shaped sliders 17 contact the fixed mold assembly 5, the four-sided pyramidal pressure head 8 moves downward, thereby driving the four wedge-shaped sliders 17 to move outward, that is, the four wedge-shaped sliders 17 expand outward.

[0106] Based on the above, it is possible that a thrust spring is fitted on the outer side of the inner guide rod 9. It is also possible that a pad 58 is fitted on the outer side of the inner guide rod 9. The function of the pad is to change the degree of descent of the four-sided pyramidal pressure head 8, thereby changing the degree of outward movement of the four wedge-shaped sliders 17. By replacing the appropriate pad, the device can be adjusted to be in the optimal operating state.

[0107] The aforementioned moving mold assembly 4 and fixed mold assembly 5 work together to achieve the following: Figure 4 The undercut stamped blanks 57 around the central annular aluminum plate 56 are stamped to form hooks. This causes the undercut stamped blanks 57 to simultaneously change from horizontal to vertical, and then into hooks. Because the hooks converge inward, the stamping and demolding of the moving die assembly 4 and the fixed die assembly 5 require special design. The above structure and its cooperation effectively solve this technical problem.

[0108] The steps for the moving mold assembly 4 and the fixed mold assembly 5 to stamp the undercut stamping blanks 57 around the annular aluminum plate 56 can be found in [reference needed]. Figures 9-19 As shown.

[0109] Figure 9 In the initial state, the moving mold assembly 4 is in the upper position, with a gap between it and the fixed mold assembly 5. An annular aluminum plate 56 is placed at the upper center of the fixed mold assembly 5. Preferably, the annular aluminum plate 56 has multiple positioning holes, and a series of slightly protruding positioning posts are located on the upper side of the fixed mold bearing 49 of the fixed mold assembly 5, so that the positioning holes and positioning posts fit together to ensure that the annular aluminum plate 56 is in an accurate centered position.

[0110] Figure 10 Combination Figure 15 As shown, the moving mold assembly 4 and the fixed mold assembly 5 are initially in contact, and this is the state of the moving mold assembly 4 before deformation.

[0111] Figure 11 Combination Figure 16 As shown, the moving mold assembly 4 and the fixed mold assembly 5 continue to move downwards after being laid together. At this time, only the four-sided pyramidal pressure head 8 moves downwards, driving the four wedge-shaped sliders 17 to move slightly outwards a distance to ensure that the outer edge of each wedge-shaped slider 17 is close to the edge of the fixed mold support 49 of the fixed mold assembly 5 (the distance difference is the thickness of the annular aluminum plate 56). At this time, the transverse sliding hole 18 and the transverse sliding groove 19 respectively play a positioning role for the inner guide rod 9 and the guide block 10 to ensure that each wedge-shaped slider 17 extends outwards to the appropriate position.

[0112] like Figure 12 Combination Figure 17 As shown, the hydraulic cylinder further drives the moving mold base 7 to move. At this time, the moving mold assembly 4 remains unchanged, while the fixed mold assembly 5 begins to move.

[0113] Figure 17 As can be seen, the moving mold assembly 4 presses the annular aluminum plate 56, which in turn presses the fixed mold bearing 49 of the fixed mold assembly 5, causing it to move downwards. At this time, the fixed mold inner sleeve 30 does not move downwards (because the outward-turning assembly 34 cannot move inwards, and the outer end of the outward-turning assembly 34 is locked to the fixed mold outer sleeve 25, the fixed mold inner sleeve 30 will not move downwards). Under the support of the inner wall of the fixed mold inner sleeve 30, the surrounding undercut stamping blanks 57 are turned upwards as if... Figure 17 In this state, each inner turning die rod 23, hinged to the outer edge of the wedge-shaped slider 17, is driven by the corresponding undercut stamping blank 57 and naturally turns upward. However, the inner turning support 22 is provided with an inclined stop to constrain each inner turning die rod 23 from continuing to turn upward.

[0114] The hydraulic cylinder continues to drive the aforementioned components downwards, causing the fixed mold bearing 49 to continue moving downwards. After the outer stop 52 of the fixed mold bearing 49 contacts the inner bottom stop 33 of the fixed mold inner sleeve 30, the two can no longer slide relative to each other. At this time, the fixed mold bearing 49 and the fixed mold inner sleeve 30 are connected and move downwards together, as... Figure 13 Combination Figure 18 As shown, the fixed mold middle support 49 and the fixed mold inner sleeve 30 move downward to the position of the outward-turning component 34.

[0115] Furthermore, such as Figure 14 Combination Figure 19 As shown, when the fixed mold support 49 and the fixed mold inner sleeve 30 move downwards beyond the position of the outward-turning component 34, the outward-turning component 34 slides within the clearance groove of the fixed mold outer sleeve 25 because the fixed mold inner sleeve 30 moves downwards while the fixed mold outer sleeve 25 remains stationary. That is, sliding occurs between the outer inclined surface 47 of the outward-turning component 34 and the inclined surface 29 of the fixed mold outer sleeve 25. This sliding causes the outward-turning component 34 to move inwards as a whole. Figure 19 As shown.

[0116] When the outward-folding assembly 34 moves outward, the guide sleeve 35 first applies pressure to the upper end of the stamped blank 57, causing it to bend, as shown. Figure 20 As shown in the middle figure, the outward turning die rod 45 is supported by the spiral groove 16 and becomes bent. The bent outward turning die rod 45 presses down from the top to the end of the undercut stamping blank 57, causing it to be bent on the upper side of the inward turning die rod 23, forming an undercut.

[0117] Return process: The hydraulic cylinder lifts upward, and under the action of the return spring 55, the fixed mold assembly 5 and the moving mold assembly 4 move upward together. First, the inner sleeve of the fixed mold 30 begins to slide upward relative to the outer sleeve of the fixed mold 25. Under the action of the outer spring 37 and the inner spring 39, the outward-folding assembly 34 pops outward, that is, the outer end of the outward-folding assembly 34 enters the relief groove 28, and the inner end of the outward-folding assembly 34 retracts into the through hole.

[0118] Then the fixed mold bearing 49 begins to slide upward relative to the fixed mold inner sleeve 30 until it stops after the return spring 55 reaches its limit.

[0119] Under the action of the hydraulic cylinder, only the moving mold assembly continues to move upward. At this time, the moving mold base 7 drives the four-sided pyramidal pressure head 8 to move upward, contacting the top pressure on the four wedge-shaped sliders 17. Under the action of their return springs (there are return springs on the outside of the horizontal guide post 20), each wedge-shaped slider 17 retracts inward. The inward movement of each wedge-shaped slider 17 pulls each inner mold-turning rod 23 inward. At this time, the annular aluminum plate 56 disengages from the moving mold assembly.

[0120] The hydraulic cylinder continues to move upward, causing the moving mold assembly to separate from the fixed mold assembly, and the annular aluminum plate 56 with peripheral undercuts is removed. Example

[0121] Improvements were made based on the embodiments. For example... Figure 4 As shown in the top view of the annular aluminum plate 56, multiple undercut stamped blanks 57 located around the perimeter of the annular aluminum plate 56 need to be stamped to form undercuts. This requires strict precision in the assembly position of the annular aluminum plate 56, ensuring that each undercut stamped blank 57 corresponds to the inner and outer flip-up component areas of the fixed and moving mold components. Therefore, assembling the annular aluminum plate 56 and ensuring its precise placement presents challenges such as labor-intensive operations and a tendency for accuracy deviations.

[0122] In response to the above situation, it can be done by, for example Figure 27 The upper center of the fixed mold bearing 49 is provided with a square protrusion 59 with a height equal to the thickness of the annular aluminum plate 56. This protrusion is used to position the square area in the middle of the annular aluminum plate 56. After positioning, it can ensure that the annular aluminum plate 56 is in the standard position.

[0123] In fact, the higher the degree of matching between the square protrusion 59 and the annular aluminum plate 56, the higher the assembly precision of the annular aluminum plate 56. However, when the degree of matching between the two is improved, the annular aluminum plate 56 is not easy to assemble on the outside of the square protrusion 59 or to remove from the square protrusion 59, which will result in a high degree of manual intervention and reduced production efficiency.

[0124] To address this issue, this implementation adopts the following approach: Figure 28 The structural form shown is specifically that a combined square protrusion with adjustable width is added to the top center area of ​​the support 49 in the fixed mold.

[0125] As shown in the figure, the combined square protrusion includes four or two sliders 60. Each slider 60 has an inclined surface 61 on its inner end, which can cooperate with the conical surface of the square pyramidal pressure head 8 for pressing and sliding. Each slider 60 has an extended sliding rod 63 at its outer end. At the same time, a groove 62 is provided on the inner side of the bearing 49 in the fixed mold. The sliding rod 63 is fitted with the groove 62 and can slide naturally. A spring 64 is fitted on the outside of the sliding rod 63. The spring 64 can make the slider 60 slide inward in its natural state, so that two or four sliders 60 are in an inward contracted state in their natural state. At this time, the width of the combined square protrusion is smaller, which facilitates the fitting of the annular aluminum plate 56.

[0126] Based on the above structure, when the device is in the stamping production state, the combined square protrusion expands outward only when it is pressed by the four-sided pyramidal pressure head 8 (it is best to constrain the extreme position after expansion, for example, to add a stop at the extreme position of expansion to constrain the maximum stroke of each slider), and is supported on the four sides of the hollow part of the annular aluminum plate to ensure that the annular aluminum plate is supported and fixed in the standard position. Example

[0127] An improvement is made based on Example 2. During operation, the above solution ensures that the annular aluminum plate 56 is firmly locked in the standard processing position and unlocks naturally after stamping, facilitating the assembly or removal of the annular aluminum plate 56 from the mold assembly and improving work efficiency. However, during this process, because the annular aluminum plate 56 is in a free, unconstrained state as the moving mold assembly moves upward, it may be caught by an inner mold rod 23 on one side, causing the annular aluminum plate 56 to rise with the moving mold assembly, potentially leading to a fall and collision. To address this issue, this embodiment employs the following... Figure 29 The supplementary solution shown.

[0128] Specifically, such as Figure 29 As shown, a mold release delay mechanism is added. Specifically, a central groove 69 is set in the center of the bearing 49 in the fixed mold, and a central rod 66 is fitted inside it. The upper end of the central rod 66 is a wedge head 67. When the central rod and its wedge head are driven to move downward by the pyramidal pressure head 8, the wedge head can drive the surrounding sliders 60 to slide outward. This process is equivalent to the case where the pyramidal pressure head 8 directly drives the sliders to move outward.

[0129] A return spring 70 is also installed in the central groove 69. The return spring 70 enables the central rod 66 to be in the upper position in its natural state, that is, in a position where it does not support the sliders.

[0130] As shown in the figure, the inner end of each slider includes a vertical surface 68 located below the inclined surface 61. Thus, when the central rod moves downward, the wedge head 67 initially supports the inclined surface 61 of each slider, causing each slider to move outward to its limit position. Then, the central rod continues to move downward, at which point the wedge head 67 supports the vertical surface 68 of each slider, and the sliding no longer causes the sliders to move outward.

[0131] like Figure 30 This embodiment illustrates the sliding cycle of the central rod and its wedge head. Pay particular attention to the process from (d) to (e) in the figure, which is the return phase. During the return phase, the pyramidal pressure head 8 moves upward, releasing its pressure on the wedge head. At this point, the moving mold assembly has moved upward, disengaging from the barbs of the annular aluminum plate 56. However, since the central rod and wedge head are still in the rising phase Δh from (d) to (e), which takes a certain amount of time, the annular aluminum plate 56 remains constrained within this time difference, i.e., supported by multiple sliders and unable to be released. This ensures that the annular aluminum plate 56 will not be suspended along with the moving mold assembly.

[0132] Thus, this embodiment solves the problem that during the upward movement of the above-mentioned moving mold assembly, the annular aluminum plate 56 is in an unrestrained free state and may be caught by the inner flipping rod 23 on one side, causing the annular aluminum plate 56 to rise with the moving mold assembly and easily fall and collide.

[0133] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, or improvements made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. For example, based on the above, it is not excluded that a thrust spring is fitted onto the outer side of the inner guide rod 9. It is also not excluded that a pad 58 is fitted onto the outer side of the inner guide rod 9. The function of the pad is to change the degree of descent of the pyramidal indenter 8, thereby changing the degree of outward movement of the four wedge-shaped sliders 17. Thus, by replacing the appropriate pad, the device can be adjusted to its optimal operating state.

Claims

1. A stamping device for composite undercut aluminum sheet for notebook casings, comprising a fixed mold base plate (1), a top plate (2), an outer guide rod (3), a moving mold assembly (4), a fixed mold assembly (5), and a hydraulic cylinder (6), characterized in that, The fixed mold assembly (5) includes a fixed mold outer sleeve (25), a fixed mold inner sleeve (30), an outward-turning assembly (34), and a fixed mold middle support (49). The fixed mold middle support (49) is fitted into the fixed mold inner sleeve (30), and the fixed mold inner sleeve (30) is fitted into the fixed mold outer sleeve (25). The fixed mold outer sleeve (25) is a rectangular frame structure, including four side walls and an annular base plate located at the bottom of the four side walls. The area located inside the annular base plate is the central square hole (27) of the outer sleeve. The inner surfaces of the four side walls are respectively provided with inwardly recessed relief grooves (28), and the bottom of each relief groove (28) has a slope (29). The fixed mold inner sleeve (30) is a rectangular frame structure. Each side wall is provided with a through hole and equipped with an outward-turning component (34). The outward-turning component (34) includes a guide sleeve (35), a fixing plate (42), and a linkage component. The outer surface of the guide sleeve (35) is cylindrical, and a rectangular central through hole (40) is provided in the axial position. The linkage component can be fitted into the rectangular central through hole and can slide. The linkage component includes a push-pull rod (44), an outward-turning mold rod (45), and a wedge-shaped push head (46). The front end of the push-pull rod (44) is hinged to the outward-turning mold rod (45) through a rotating shaft (48). The rear end of the push-pull rod (44) is fixedly connected to the wedge-shaped push head (46). The wedge-shaped push head (46) has an outer inclined surface (47) on the lower rear side. The fixed mold bearing ( 49) Includes a rectangular support plate with a central guide rod (53) vertically fixed at the bottom center. A central guide hole (54) is provided at the center of the fixed mold base plate (1). The central guide rod (53) is fitted into the central guide hole (54), and a return spring (55) is fitted on the outside of the central guide rod (53). The moving mold assembly (4) includes a moving mold base (7), a moving mold sleeve (11), a wedge slider (17), and an inward flipping assembly. The moving mold base (7) includes a rectangular plate, the upper part of which is fixed to the push rod of the hydraulic cylinder (6), and the lower part of which is fixed with a four-sided pyramidal pressure head (8). Through holes are provided around it, and inner guide rods (9) are installed through them respectively. The moving mold sleeve (11) is a rectangular structure. The assembly includes four side walls and a base plate. The base plate has a central square hole (15) at its center. Each side wall of the central square hole (15) has a recessed horizontal guide hole (14) facing inward. The four edges of the base plate have vertically penetrating guide holes (13). A spiral groove (16) is provided at the outer corner where the base plate meets the four side walls. Four triangular wedge-shaped sliders (17) are connected in sequence to form a rectangular assembly. The rectangular assembly is fitted into the area of ​​the central square hole (15). Each wedge-shaped slider (17) includes an outer base plate part and an inner wedge-shaped part. The height of the wedge-shaped part is higher than that of the base plate part. The center of the base plate has a horizontal sliding hole (18). The horizontal sliding hole (18) matches and fits with the inner guide rod (9).The inner guide rod (9) can slide outward or inward in the transverse sliding hole (18). An inclined surface (21) is provided on the upper part of the inner end of the wedge-shaped part. The inclined surface (21) matches and connects with an inclined surface of the square pyramid indenter (8). The inward turning assembly includes an inward turning support (22) extending outward at the outer edge of the base plate part. The inward turning support (22) is provided with a plurality of slots. Each slot is provided with a shaft hole and a pin (24) is installed. Each pin is hinged with an inner mold rod (23). The moving mold base (7) is fitted into the inner cavity (12) of the moving mold sleeve (11). The wedge-shaped sliders (17) are fitted into the central square hole (15) of the moving mold sleeve (11), and the four wedge-shaped sliders (17) are located below the bottom plate of the moving mold sleeve (11). At the same time, the transverse guide post (20) of each wedge-shaped slider (17) is inserted into the corresponding transverse guide hole (14).

2. The stamping apparatus according to claim 1, characterized in that, The fixed mold inner sleeve (30) is a rectangular frame structure. Vertical inner sleeve guide strips (32) are provided at intervals on the inner surface of each side wall around it, and an inner sleeve bottom stop (33) is provided at the bottom of each inner sleeve guide strip (32). At the same time, a series of outer guide grooves (51) are provided at intervals on each of the four side walls of the bearing plate. An outer stop (52) is provided on the upper side of each outer guide groove (51). When the fixed mold middle support (49) is fitted into the inner side of the fixed mold inner sleeve (30), the inner sleeve guide strips (32) and the outer guide grooves (51) are fitted together. The fixed mold middle support (49) and the fixed mold inner sleeve (30) slide through the corresponding guide grooves and guide strips. When the sliding reaches the limit position, the inner sleeve bottom stop (33) contacts the outer stop (52) to restrict further sliding.

3. The stamping apparatus according to claim 1, characterized in that, There is a clearance groove (41) on the lower front side of the central through hole of the guide sleeve (35), and an inner retaining ring (38) on the rear side of the central through hole. An inner spring (39) is fitted in the inner retaining ring (38). There is an outer stop (36) on the rear side of the outer side of the guide sleeve (35). An outer spring (37) is fitted in front of the outer stop (36). The guide sleeve (35) is fitted into the through hole provided on the side wall of the fixed mold inner sleeve base (30) and is fixed by a fixing plate (42). A central hole (43) is also provided in the center of the fixing plate (42). The linkage component is also fitted in the central hole (43).

4. The stamping apparatus according to claim 1, characterized in that, Each inner guide rod (9) has a guide block (10) fixed at its bottom. The width of the guide block (10) is greater than the width of the inner guide rod (9). Each wedge slider (17) has a horizontal sliding hole (18) and a horizontal sliding groove (19) in the middle of its base plate. The horizontal sliding hole (18) is fitted with the inner guide rod (9), and the horizontal sliding groove (19) is fitted with the guide block (10), so that the inner guide rod (9) and the guide block (10) can slide outward or inward in the horizontal sliding hole (18) and the horizontal sliding groove (19), respectively.

5. The stamping apparatus according to claim 1, characterized in that, On the vertical surface of the wedge-shaped part of the wedge slider (17), there are horizontal guide posts (20) fixed vertically. Each horizontal guide post (20) is matched and fitted into the corresponding horizontal guide hole (14). At the same time, a thrust spring that drives the wedge slider (17) to move inward is fitted on the outside of each horizontal guide post (20).

6. The stamping apparatus according to claim 1, characterized in that, A thrust spring is fitted on the outside of the inner guide rod (9); or, a pad (58) is fitted on the outside of the inner guide rod (9), the pad being able to change the degree of descent of the pyramidal indenter (8), thereby changing the degree of outward movement of the four wedge-shaped sliders (17).

7. The stamping apparatus according to claim 1, characterized in that, At the four top corners of the outer mold outer sleeve seat (25) of the fixed mold assembly (5), guide sleeves are respectively provided and respectively fitted and fixed on each outer guide rod (3) of the mold body. The bottom of each outer guide rod (3) is fixed at the four top corners of the fixed mold base plate (1), and the fixed mold outer sleeve seat (25) is fixed on the upper side of the fixed mold base plate (1).

8. The stamping apparatus according to claim 2, characterized in that, After the fixed mold inner sleeve (30) is fitted inside the fixed mold outer sleeve (25), the wedge-shaped pusher (46) at the outer end of the outward-turning component (34) pops out and extends into the relief groove (28) of the fixed mold outer sleeve (25); after the fixed mold middle support (49) is fitted inside the fixed mold inner sleeve (30), the inner sleeve guide strip (32) and the outer guide groove (51) are fitted together; when the fixed mold middle support (49) moves downward, the fixed mold inner sleeve (30) and the fixed mold middle support... The seats (49) can slide relative to each other. When the inner bottom stop (33) and the outer stop (52) come into contact, they no longer slide relative to each other, but move downwards synchronously. The downward movement of the fixed mold inner sleeve seat (30) drives the outward turning component (34) to move downwards together, so that the wedge-shaped push head (46) at the outer end of the outward turning component (34) moves downwards, thereby causing the outer inclined surface (47) to slide on the inclined surface (29) of the fixed mold outer sleeve seat (25), thereby driving the outward turning component (34) to move inwards laterally.

9. The stamping apparatus according to claim 1, characterized in that, A square protrusion (59) with a height equal to the thickness of the annular aluminum plate (56) is provided at the upper center of the fixed mold bearing (49) to position the square area in the middle of the annular aluminum plate (56).

10. The stamping apparatus according to claim 1, characterized in that, A combined square protrusion with adjustable width is added to the top center area of ​​the fixed mold support (49), or a mold release delay mechanism is installed inside the combined square protrusion.

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