A negative angle trimming and delayed pressure maintaining composite structure for stamping thin-wall metal parts of electronic products

Abstract

The application relates to the field of metal piece stamping, and discloses a negative angle shaping and delay pressure maintaining composite structure for electronic product thin-wall metal piece stamping, which comprises a stamping machine base, the top of the stamping machine base is fixedly connected with a bottom die support plate. The hinged points of the curved lever, the second connecting rod and the third connecting rod are in the same straight line through the transmission mechanism for driving the movement of the curved lever, the mechanism reaches the dead point position, at this time, the dead point mechanical self-locking characteristic is utilized, the punch can keep stable pressing pressure on the workpiece without the need of continuous external power input, delay pressure maintaining is realized, material springback is effectively inhibited, the shape and size stability of the product is ensured, and the pure mechanical self-locking structure avoids the pressure fluctuation problem caused by system leakage in the traditional hydraulic or pneumatic pressure maintaining mode, and the safety and reliability of the equipment are improved.

Description

Technical Field

[0001] This application relates to the field of metal stamping technology, and in particular to a composite structure for negative angle shaping and delayed pressure holding during the stamping of thin-walled metal parts for electronic products. Background Technology

[0002] Stamping is a common forming process in the production of thin-walled metal parts for electronic products. It involves applying pressure to a metal sheet using a die to cause plastic deformation and obtain parts of the required shape and size. As electronic products become thinner and more precise, the structure of thin-walled metal parts is becoming increasingly complex, and the requirements for their forming accuracy and surface quality are constantly increasing, which places higher demands on stamping processes and die structures.

[0003] In existing stamping processes, for thin-walled metal parts with multiple stamping positions, residual stress remains inside the material after stamping. During demolding, elastic recovery, or springback, occurs, causing the workpiece dimensions to deviate from the design values. Therefore, it is often necessary to maintain pressure on the workpiece after stamping to achieve pressure holding and suppress springback. Existing pressure holding methods mostly rely on hydraulic systems, pneumatic systems, or additional locking devices to maintain the punch pressure. This is not only complex and costly, but hydraulic or pneumatic systems are also prone to pressure fluctuations due to leakage, affecting the stability and consistency of the pressure holding effect. At the same time, the additional locking devices require independent control, increasing the control difficulty and failure rate of the equipment. In addition, existing technologies usually use multiple punches to press down simultaneously for stamping. However, due to the poor rigidity of thin-walled metal parts, the impact force and stress generated between the stamping areas when multiple punches are loaded simultaneously can easily lead to overall deformation or local instability of the workpiece, affecting the forming accuracy. Furthermore, when multiple punches press down and hold pressure simultaneously, the springback of the material in each area affects each other during the pressure holding process, which can easily lead to stress concentration inside the workpiece and affect the consistency of product dimensions. Summary of the Invention

[0004] This application proposes a composite structure for negative angle shaping and delayed pressure holding during the stamping of thin-walled metal parts for electronic products. It has the advantage of mechanical self-locking pressure holding and solves the problem of complex pressure holding methods.

[0005] To achieve the above objectives, this application adopts the following technical solution: a composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products, including a stamping machine base, a bottom die support plate fixedly connected to the top of the stamping machine base, a bottom die body fixedly connected to the middle of the top of the bottom die support plate, an mounting block fixedly connected to the top of the bottom die support plate, an upper support plate provided on the top of the bottom die body, the upper support plate being fixedly connected to the mounting block, and an ordered stamping assembly provided inside the mounting block;

[0006] A pressure plate is provided at the bottom of the upper support plate, and a shaping component is provided inside the pressure plate;

[0007] The pressure plate has multiple sets of shaping plates slidably connected inside, and one set of shaping plates has a moving component on one side.

[0008] Preferably, the ordered stamping assembly includes an active crankshaft rotatably connected to the interior of the stamping press base. Multiple sets of cranks are fixedly connected to the shaft of the active crankshaft. A connecting block is movably sleeved on the outer side of each crank. A driving block is hinged to the bottom of the connecting block. A first guide post is movably sleeved on the outer side of the driving block. The first guide post is fixedly connected to a mounting block. A connecting rod is fixedly connected to one side of the driving block. A first connecting rod is hinged to one side of the connecting rod. A second connecting rod is hinged to the other side of the first connecting rod. The second connecting rod is movably hinged to the upper support plate via a connecting post. The middle of the first connecting rod is movably hinged to one end of a third connecting rod. A sliding post is hinged to the other end of the third connecting rod. A limit block is fixedly connected to the outer side of the sliding post. A punch is fixedly connected to the bottom of the sliding post. The punch is correspondingly positioned to the bottom die body. A third spring is fixedly connected to one side of the limit block. The other end of the third spring is fixedly connected to the upper support plate.

[0009] Preferably, the shaping component includes a fixed wedge plate, which is slidably connected to the inside of the pressure plate and fixedly connected to the upper support plate. The pressure plate is fixedly connected to the outermost symmetrical sliding column. A guide ring groove is provided in the middle of the pressure plate. A shaping plate is slidably connected inside the guide ring groove. A second guide column is slidably connected to the bottom of the shaping plate. A guide wedge block is fixedly connected to one side of the shaping plate.

[0010] Preferably, the shaping component further includes a T-shaped block, which is fixedly connected to the top of the second guide post. The shaping plate has a moving groove inside. One side of the T-shaped block is fixedly connected to one end of a first spring, and the other end of the first spring is fixedly connected to the shaping plate.

[0011] Preferably, the moving component includes a second wedge block, which is fixedly connected to one side of one of the shaping plates. A first wedge block is fixedly connected inside the pressure plate. The inclined surfaces of the first wedge block and the second wedge block are arranged on the same axis, and the positions of the first wedge block and the second wedge block correspond to each other.

[0012] Preferably, the moving component further includes a fixing plate, which is fixedly connected to the inside of the guide ring groove. One end of a second spring is fixedly connected to one side of the fixing plate, and the other end of the second spring is fixedly connected to the second guide post.

[0013] Preferably, the first wedge and the second wedge are mutually cooperating components, and only one set is provided on the same side. The multiple sets of shaping plates are multi-segment structures that are hinged to each other. Adjacent shaping plates can be deflected relative to each other, so that the multiple sets of shaping plates can be sequentially unfolded along the arc contour of the guide ring groove and move outward synchronously under the push of the inclined surface of the fixed wedge plate. The first wedge, the second wedge, the fixed plate and the second spring are on the same side, which facilitates the reset of the shaping plates after they are pushed out.

[0014] Preferably, the multiple sets of cranks are arranged symmetrically at the center, the tilt angles of the symmetrical cranks are equal, and there is a sequential angle deviation between the multiple sets of symmetrical cranks.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This invention uses a transmission mechanism to drive its movement, ensuring that the hinge points of the crank and the second and third connecting rods are aligned on the same straight line. When the mechanism reaches its dead point position, the mechanical self-locking characteristic of the dead point is utilized to allow the punch to maintain stable pressing pressure on the workpiece without continuous external power input, achieving delayed pressure holding, effectively suppressing material springback, ensuring the stability of product shape and dimensions, and the pure mechanical self-locking structure avoids the pressure fluctuation problem caused by system leakage in traditional hydraulic or pneumatic pressure holding methods, thus improving the safety and reliability of the equipment.

[0017] 2. In this invention, by setting a sequential angular deviation between each set of cranks, each punch sequentially reaches the bottom dead center from the center to both sides during the rotation of the active crankshaft to complete the stamping. This avoids the impact deformation caused by multiple punches loading simultaneously on thin-walled metal parts, ensuring that each stamping area is formed sequentially and orderly, thus improving stamping accuracy. At the same time, after each punch reaches its respective bottom dead center, it maintains a brief pressure on different areas of the workpiece to achieve sequential pressure holding. This allows the material springback in each area to be gradually released during the pressure holding process, further suppressing springback and avoiding stress concentration inside the workpiece caused by multiple punches holding pressure simultaneously, thereby improving the consistency of product dimensions.

[0018] 3. In this invention, when the outermost sliding column is pressed down, it simultaneously drives the pressure plate to move downward, and the fixed wedge plate slides upward relative to the pressure plate. When it moves to a certain distance, the inclined surface of the bottom surface of the fixed wedge plate cooperates with the inclined surface of the guide wedge block to push the shaping plate outward. This process is used to shape the negative angle part generated after the plate is stamped outward, eliminating demolding interference and reducing the impact of burrs on subsequent processing.

[0019] 4. In this invention, when the shaping plate is pushed to its limit position, the first wedge and the second wedge engage to generate lateral displacement. Since the multiple shaping plates are a multi-segment structure with hinges, the movement of any shaping plate can drive the other shaping plates to move outward synchronously, ensuring the uniformity of shaping. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0021] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the mounting block of the present invention;

[0024] Figure 3 For the present invention Figure 3 Enlarged view of the structure at point A in the middle;

[0025] Figure 4 This is a structural diagram of the ordered stamping assembly of the present invention;

[0026] Figure 5 This is a schematic diagram of the crank mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the connecting rod of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the bottom mold body of the present invention;

[0029] Figure 8 This is a schematic diagram of the shaping component structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the mobile component of the present invention;

[0031] Figure 10 This is a schematic diagram of the internal structure of the shaping plate of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the second spring of the present invention.

[0033] The components include: 1. Press base; 2. Bottom mold support plate; 3. Bottom mold body; 4. Mounting block; 5. Upper support plate; 6. Orderly stamping assembly; 61. Active crankshaft; 62. Crankshaft; 63. Connecting block; 64. Drive block; 65. First guide post; 66. Connecting rod; 67. First connecting rod; 68. Second connecting rod; 69. Third connecting rod; 610. Sliding post; 611. Limiting block; 612. Punch; 613. Third spring; 7. Shaping assembly; 71. Pressure plate; 72. Fixed wedge plate; 73. Guide ring groove; 74. Shaping plate; 75. Second guide post; 76. T-block; 77. Moving groove; 78. First spring; 79. Guide wedge block; 8. Moving assembly; 81. First wedge block; 82. Second wedge block; 83. Fixed plate; 84. Second spring. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] Please see Figure 1-11 A composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products includes a stamping machine base 1, a bottom mold support plate 2 fixedly connected to the top of the stamping machine base 1, a bottom mold body 3 fixedly connected to the middle of the top of the bottom mold support plate 2, an mounting block 4 fixedly connected to the top of the bottom mold support plate 2, an upper support plate 5 provided on the top of the bottom mold body 3, the upper support plate 5 and the mounting block 4 fixedly connected, and an ordered stamping assembly 6 provided inside the mounting block 4;

[0036] A pressure plate 71 is provided at the bottom of the upper support plate 5, and a shaping component 7 is provided inside the pressure plate 71;

[0037] The pressure plate 71 has multiple sets of shaping plates 74 internally slidably connected, and one side of one set of shaping plates 74 is provided with a moving component 8.

[0038] Specifically, the active crankshaft 61 rotates, driving the crank 62 to rotate. The crank 62 pushes the drive block 64 to slide along the first guide post 65 through the connecting block 63. The drive block 64 drives the first connecting rod 67 to swing through the connecting rod 66. The first connecting rod 67 drives the third connecting rod 69 to move. The third connecting rod 69 pushes the sliding post 610 and the punch 612 to press downwards. During this process, there is a sequential angle deviation between multiple sets of cranks 62, realizing sequential pressing from the middle to both sides, avoiding deformation of thin-walled parts caused by multiple punches 612 pressing down at the same time. Each punch 612 reaches the bottom dead point in sequence. At this time, the crank 62 and the connecting rod hinge point are on the same straight line. The mechanism is in the dead point position, generating mechanical force amplification and self-locking, realizing delayed pressure holding, and effectively suppressing springback. At the same time, when the orderly stamping assembly 6 works, it will drive the pressure plate 71 to move down, and the fixed wedge plate 72 will move up relative to the pressure plate 71. At this time, the guide wedge block 79 will provide kinetic energy to drive the shaping assembly 7 and the moving assembly 8 to realize the negative angle shaping of the thin-walled metal parts.

[0039] like Figures 2 to 6As shown, the ordered stamping assembly 6 includes a drive crankshaft 61, which is rotatably connected to the inside of the stamping machine base 1. Multiple sets of cranks 62 are fixedly connected to the shaft of the drive crankshaft 61. A connecting block 63 is movably sleeved on the outer side of each crank 62. A drive block 64 is hinged to the bottom of the connecting block 63. A first guide post 65 is movably sleeved on the outer side of the drive block 64. The first guide post 65 is fixedly connected to the mounting block 4. A connecting rod 66 is fixedly connected to one side of the drive block 64. A first connecting rod 67 is hinged to one side of the connecting rod 66. The other side of the first connecting rod 67... A second connecting rod 68 is hinged to the upper support plate 5 via a connecting column. The middle part of the first connecting rod 67 is hinged to one end of the third connecting rod 69. The other end of the third connecting rod 69 is hinged to a sliding column 610. A limit block 611 is fixedly connected to the outside of the sliding column 610. A punch 612 is fixedly connected to the bottom of the sliding column 610. The punch 612 is correspondingly set to the bottom mold body 3. One end of a third spring 613 is fixedly connected to one side of the limit block 611. The other end of the third spring 613 is fixedly connected to the upper support plate 5.

[0040] Specifically, the sliding column 610 is slidably connected to the guide hole of the upper support plate 5, so that when the third connecting rod 69 pushes the sliding column 610, it can only slide back and forth in the vertical direction; multiple sets of cranks 62 are distributed at intervals along the axial direction of the active crankshaft 61, and there is a sequential angle deviation between each set of cranks 62, so that each punch 612 reaches the bottom dead center position in sequence during the rotation of the active crankshaft 61, realizing sequential punching from the middle to both sides; one end of the second connecting rod 68 is movably hinged to the upper support plate 5 through the connecting column, the other end of the second connecting rod 68 is hinged to the first connecting rod 67, and the middle part of the second connecting rod 68 is fixedly connected to the mounting block 4, so that the second connecting rod 68 and the mounting block 4 are fixedly connected. The connection point is a fixed hinge point. When the first link 67 swings, the displacement of the third link 69 is converted into a vertical downward thrust on the sliding column 610 through the fixed fulcrum of the second link 68. The third spring 613 is sleeved on the outside of the sliding column 610, with one end abutting against the limiting block 611 and the other end abutting against the upper support plate 5. It is used to push the limiting block 611 and the sliding column 610 to return to the upper position after the stamping is completed. When the crank 62 rotates to the point where its rotation center is on the same straight line as the hinge point of the second link 68 and the third link 69, the mechanism reaches the dead point position, generating mechanical force amplification and self-locking, so that the punch 612 is kept in the pressing state, realizing delayed pressure holding.

[0041] like Figure 8As shown, the shaping component 7 includes a fixed wedge plate 72, which is slidably connected to the inside of the pressure plate 71. The fixed wedge plate 72 is fixedly connected to the upper support plate 5. The pressure plate 71 is fixedly connected to the outermost symmetrical sliding column 610. A guide ring groove 73 is provided in the middle of the pressure plate 71. A shaping plate 74 is slidably connected inside the guide ring groove 73. A second guide column 75 is slidably connected to the bottom of the shaping plate 74. A guide wedge block 79 is fixedly connected to one side of the shaping plate 74.

[0042] Specifically, the bottom of the fixed wedge plate 72 has a continuous inclined surface. When the pressure plate 71 moves downward, the fixed wedge plate 72 slides upward relative to the pressure plate 71. The inclined surface of the guide wedge block 79 cooperates with the inclined surface at the bottom of the fixed wedge plate 72, thereby pushing multiple sets of shaping plates 74 outward along the guide ring groove 73 when the pressure plate 71 moves downward. The multiple sets of shaping plates 74 are a multi-segment structure that is hinged to each other. Through the hinge, each shaping plate 74 can unfold sequentially along the continuous inclined surface of the fixed wedge plate 72 and move outward synchronously. The second guide post 75 slides through the inside of the shaping plate 74 to guide the pushing direction of the shaping plate 74. The inside of the shaping plate 74 is provided with a moving groove 77. The top of the second guide post 75 is fixedly connected to a T-shaped block 76. The T-shaped block 76 is slidably connected in the moving groove 77, and a first spring 78 is connected between the T-shaped block 76 and the shaping plate 74 for resetting the second guide post 75 after shaping.

[0043] like Figure 10 As shown, the shaping component 7 also includes a T-shaped block 76, which is fixedly connected to the top of the second guide post 75. The shaping plate 74 has a moving groove 77 inside. One end of the first spring 78 is fixedly connected to one side of the T-shaped block 76, and the other end of the first spring 78 is fixedly connected to the shaping plate 74.

[0044] Specifically, the T-shaped block 76 is fixedly connected to the top of the second guide post 75 and slidably connected to the moving groove 77. The moving groove 77 is opened inside the shaping plate 74 and extends along the axial direction of the second guide post 75. One end of the first spring 78 is fixedly connected to one side of the T-shaped block 76, and the other end of the first spring 78 is fixedly connected to the shaping plate 74. The movement of the second guide post 75 is limited and guided by the sliding cooperation between the T-shaped block 76 and the moving groove 77, and the elastic force of the first spring 78 drives the second guide post 75 to reset after the shaping is completed.

[0045] like Figures 9 to 10 As shown, the moving component 8 includes a second wedge 82, which is fixedly connected to one side of one of the shaping plates 74. A first wedge 81 is fixedly connected inside the pressure plate 71. The inclined surfaces of the first wedge 81 and the second wedge 82 are arranged on the same axis, and the positions of the first wedge 81 and the second wedge 82 correspond to each other.

[0046] Specifically, the first wedge 81 is fixedly connected to the inside of the pressure plate 71, and the second wedge 82 is fixedly connected to one side of one of the shaping plates 74. The inclined surfaces of the first wedge 81 and the second wedge 82 are set on the same axis and correspond to each other. When the shaping plate 74 is pushed to the limit position, the second wedge 82 moves with the shaping plate 74 to abut against the inclined surface of the first wedge 81. Through the inclined surface cooperation, the second guide post 75 is pushed to generate lateral displacement. Then, through multiple sets of hinged shaping plates 74, all shaping plates 74 are driven to move outward synchronously to the final shaping position. When resetting, the second spring 84 pulls the second guide post 75 and the second wedge 82 to move in the opposite direction, so that the second wedge 82 disengages from the first wedge 81 and releases the limitation on the shaping plate 74.

[0047] like Figure 11 As shown, the moving component 8 also includes a fixing plate 83, which is fixedly connected to the inside of the guide ring groove 73. One end of the second spring 84 is fixedly connected to one side of the fixing plate 83, and the other end of the second spring 84 is fixedly connected to the second guide post 75.

[0048] Specifically, the fixing plate 83 is fixedly connected to the inside of the guide ring groove 73. One end of the second spring 84 is fixedly connected to the fixing plate 83, and the other end is fixedly connected to the second guide post 75. After the shaping is completed, the elastic force of the second spring 84 pulls the second guide post 75 and the second wedge 82 to return to their lateral position, so that the second wedge 82 disengages from the first wedge 81 and releases the restriction on the shaping plate 74.

[0049] like Figure 8 and Figure 9 As shown, the first wedge 81 and the second wedge 82 are mutually cooperating components, and only one set is provided on the same side. The multiple sets of shaping plates 74 are multi-segment structures that are hinged to each other. Adjacent shaping plates 74 can be deflected relative to each other, so that the multiple sets of shaping plates 74 can be pushed along the arc contour of the guide ring groove 73 in sequence and move outward synchronously under the push of the inclined surface of the fixed wedge plate 72. The first wedge 81, the second wedge 82, the fixed plate 83 and the second spring 84 are on the same side, which facilitates the reset of the shaping plate 74 after it is pushed out.

[0050] Specifically, the first wedge 81 and the second wedge 82 are wedge-shaped components that cooperate with each other, and only one set of such components is provided on the same side; the first wedge 81, the second wedge 82, the fixing plate 83 and the second spring 84 are all provided on the same side of the pressure plate 71 so that each component can work together in the same direction during reset, ensuring the reliability of reset.

[0051] like Figure 4 and Figure 5 As shown, multiple sets of cranks 62 are centrally symmetrically arranged, and the tilt angles of the symmetrical cranks 62 are equal. There is a sequential angle deviation between the multiple sets of symmetrical cranks 62.

[0052] Specifically, the sequential angular deviation between multiple sets of cranks 62 causes each punch 612 to reach the bottom dead center position in sequence during the rotation of the active crankshaft 61, thereby achieving sequential stamping from the center to both sides.

[0053] The active crankshaft 61 is driven by an external motor, which is existing technology and commonly used in practice, but is not shown in detail in the figure.

[0054] Working principle:

[0055] During operation, the rotation of the active crankshaft 61 drives the crank 62 and connecting block 63 to rotate. The rotation of the crank 62 causes the connecting block 63 to move downwards. The movement of the connecting block 63 pushes the drive block 64 to move along the first guide post 65, thereby changing the angle of the inclined first connecting rod 67. The displacement generated by this change in angle of the first connecting rod 67 drives the third connecting rod 69 to move. Simultaneously, because one end of the second connecting rod 68 is fixed to the mounting block 4, one point of it becomes a fixed end, thus transferring the displacement of the third connecting rod 69... The force is converted into a downward thrust in the vertical direction, which in turn pushes the sliding column 610 and the punch 612 to move, thereby performing stamping work on the thin-walled metal part. During this process, since the multiple sets of cranks 62 are symmetrically arranged and there is a sequential angle deviation between each set of cranks 62, the working process is to first drive the corresponding punch 612 to complete the stamping by the middle crank 62, and then drive the punch 612 to complete the stamping by the cranks on both sides in sequence, so as to achieve sequential stamping and avoid workpiece deformation caused by multiple punches 612 pressing down at the same time. After the stamping is completed, the drive crankshaft 61 remains stationary. The current position remains unchanged, allowing the punch 612 to maintain pressure on the sheet metal for a period of time, achieving delayed pressure holding. During the stamping process, to ensure the thin-walled metal part is fully formed and to reduce springback, each punch 612, driven by the crank 62, sequentially reaches the bottom dead center position. At this point, the hinge points of each crank 62 and its corresponding second connecting rod 68 and third connecting rod 69 are almost on the same straight line, meaning the mechanism has reached the dead center position. Simultaneously, as the mechanism moves to the dead center, the transmission angle approaches zero, and the driving force of the drive crankshaft 61 is amplified several times, transforming into a huge stamping force to ensure... Thin-walled metal parts are fully stamped and formed. At the same time, the mechanism forms a mechanical self-lock at the dead point, which allows the punch 612 to maintain a stable pressure on the workpiece for a period of time without continuous power input, thus achieving delayed pressure holding. On the one hand, the pressure holding effectively suppresses the springback of the material and ensures the stability of the product shape. On the other hand, it also avoids pressure instability caused by fluctuations in the hydraulic or pneumatic system, improving the safety and reliability of the equipment. After the pressure holding is completed, the active crankshaft 61 reverses, the mechanism leaves the dead point position, the self-lock is released, and each component begins to reset.

[0056] During the stamping process of punch 612, since the outer punch 612 is fixedly connected to the pressure plate 71, the outermost sliding column 610 will push down and drive the pressure plate 71 to move downward. At this time, as the pressure plate 71 moves downward, the fixed wedge plate 72, which is fixed to the upper support plate 5, will move upward relative to the pressure plate 71. When it moves to a certain distance, the inclined surface of the bottom surface of the fixed wedge plate 72 will cooperate with the inclined surface of the guide wedge block 79, thereby pushing out the forming plate 74. At this time, the stamped plate will deform due to the stamping of punch 612, and its outer edge will bend inward, thus creating a negative angle. At the same time, the pushing out of the forming plate 74 will contact the negative angle part of the plate and push it outward, realizing the negative angle shaping. When the forming plate 74 is pushed to the limit position, the first wedge block 81 set on one side of one of the forming plates 74 will cooperate with the second wedge block 82 to abut against it. The plate moves to one side, and because multiple shaping plates 74 are hinged, and their inclined surfaces cooperate with the inclined surfaces of the fixed wedge plate 72, the movement of one shaping plate 74 will drive the other shaping plates 74 to move outward synchronously, thereby completely pushing out the negative corner of the plate and completing the negative corner shaping work. This reduces the impact of burrs generated at the edge of the negative corner during the shaping process on subsequent processing. After stamping, the active crankshaft 61 reverses after stamping to drive each component to reset, thereby retracting the shaping plate 74 from the outside into the pressure plate 71. During its reset process, the lateral displacement caused by the first wedge block 81 and the second wedge block 82 will be reset by the pull of the second spring 84, and its longitudinal displacement will be reset by the pull of the first spring 78, thereby achieving the synchronous reset of the delayed pressure holding and the shaping structure, ensuring the stability of the next stamping cycle.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products, comprising a stamping machine base (1), characterized in that, The bottom mold support plate (2) is fixedly connected to the top of the stamping machine base (1), the bottom mold body (3) is fixedly connected to the middle of the top of the bottom mold support plate (2), the mounting block (4) is fixedly connected to the top of the bottom mold support plate (2), the top of the bottom mold body (3) is provided with an upper support plate (5), the upper support plate (5) is fixedly connected to the mounting block (4), and the inside of the mounting block (4) is provided with an ordered stamping assembly (6). The bottom of the upper support plate (5) is provided with a pressure plate (71), and the inside of the pressure plate (71) is provided with a shaping component (7). The pressure plate (71) has multiple sets of shaping plates (74) internally slidably connected, and a moving component (8) is provided on one side of one set of shaping plates (74).

2. The composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 1, characterized in that, The ordered stamping assembly (6) includes an active crankshaft (61), which is rotatably connected to the inside of the stamping machine base (1). Multiple sets of cranks (62) are fixedly connected to the shaft of the active crankshaft (61). A connecting block (63) is movably sleeved on the outer side of each crank (62). A driving block (64) is hinged to the bottom of the connecting block (63). A first guide post (65) is movably sleeved on the outer side of the driving block (64). The first guide post (65) is fixedly connected to the mounting block (4). A connecting rod (66) is fixedly connected to one side of the driving block (64). A first connecting rod (67) is hinged to one side of the connecting rod (66). On the other side, a second connecting rod (68) is hinged. The second connecting rod (68) is movably hinged to the upper support plate (5) through a connecting column. The middle part of the first connecting rod (67) is movably hinged to one end of the third connecting rod (69). The other end of the third connecting rod (69) is hinged to a sliding column (610). A limit block (611) is fixedly connected to the outside of the sliding column (610). A punch (612) is fixedly connected to the bottom of the sliding column (610). The punch (612) is correspondingly set to the bottom mold body (3). One side of the limit block (611) is fixedly connected to one end of a third spring (613). The other end of the third spring (613) is fixedly connected to the upper support plate (5).

3. The composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 1, characterized in that, The shaping component (7) includes a fixed wedge plate (72), which is slidably connected to the inside of the pressure plate (71). The fixed wedge plate (72) is fixedly connected to the upper support plate (5). The pressure plate (71) is fixedly connected to the outermost symmetrical sliding column (610). A guide ring groove (73) is provided in the middle of the pressure plate (71). A shaping plate (74) is slidably connected inside the guide ring groove (73). A second guide column (75) is slidably connected to the bottom of the shaping plate (74). A guide wedge block (79) is fixedly connected to one side of the shaping plate (74).

4. The composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 3, characterized in that, The shaping component (7) also includes a T-shaped block (76), which is fixedly connected to the top of the second guide post (75). The shaping plate (74) has a moving groove (77) inside. One side of the T-shaped block (76) is fixedly connected to one end of a first spring (78), and the other end of the first spring (78) is fixedly connected to the shaping plate (74).

5. The composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 1, characterized in that, The moving component (8) includes a second wedge (82), which is fixedly connected to one side of one of the shaping plates (74). A first wedge (81) is fixedly connected inside the pressure plate (71). The inclined surfaces of the first wedge (81) and the second wedge (82) are arranged on the same axis, and the positions of the first wedge (81) and the second wedge (82) correspond to each other.

6. The composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 3, characterized in that, The moving component (8) also includes a fixing plate (83), which is fixedly connected to the inside of the guide ring groove (73). One end of the second spring (84) is fixedly connected to one side of the fixing plate (83), and the other end of the second spring (84) is fixedly connected to the second guide post (75).

7. A composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products, as described in claim 5, is characterized in that... The first wedge (81) and the second wedge (82) are mutually cooperating components, and only one set is provided on the same side. The multiple sets of shaping plates (74) are multi-segment structures that are hinged to each other. The adjacent shaping plates (74) can be deflected relative to each other, so that the multiple sets of shaping plates (74) can be pushed along the arc contour of the guide ring groove (73) and move outward synchronously under the push of the inclined surface of the fixed wedge plate (72). The first wedge (81), the second wedge (82), the fixed plate (83) and the second spring (84) are on the same side, which facilitates the reset of the shaping plate (74) after it is pushed out.

8. A composite structure for negative angle shaping and delayed pressure holding during stamping of thin-walled metal parts for electronic products according to claim 2, characterized in that, The multiple sets of cranks (62) are centrally symmetrically arranged, and the tilt angles of the symmetrical cranks (62) are equal. There is a sequential angle deviation between the multiple sets of symmetrical cranks (62).

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