A stamping device

Abstract

The utility model relates to punch forming technical field provides a punch device for folding and negative angle bending to work piece, and the punch device includes: fixed die assembly is provided with support seat on it, and support seat has support surface and profiling surface, and support surface provides stable support for work piece main part, and profiling surface is regarded as the datum contour of negative angle forming, movable die assembly can reciprocate along vertical direction relative to fixed die assembly, and the folding piece is provided on movable die assembly and is used for folding operation to work piece along vertical direction, and the bending piece moves and sets up in the side of support seat, is used for exerting bending force to the folded position of work piece along horizontal direction to form negative angle structure. Through the design of folding piece and bending piece, the whole forming process is continuously completed by single stamping stroke under the once clamping of work piece, avoids the positioning error accumulation, the low production efficiency and the multiple equipment occupation etc. caused by multiple clamping, forming in multiple processes.

Description

Technical Field

[0001] This utility model belongs to the field of stamping forming technology, and specifically relates to a stamping device. Background Technology

[0002] In the existing manufacturing process of sheet metal or metal structural parts, for workpieces with complex geometric features (such as those that need to form a concave negative angle after folding), multiple stamping processes are usually required to complete the folding and negative angle bending operations separately. For example, the workpiece is first folded at a 90° or other angle using a set of dies, and then the workpiece is transferred to another set of dedicated bending dies with a negative angle of less than 90° for secondary forming.

[0003] However, this step-by-step processing method has the following significant problems: it requires multiple clamping, mold changing and workpiece transfer, which prolongs the overall processing cycle; multiple positioning can easily lead to misalignment between the folding position and the negative angle area, affecting the product's dimensional accuracy; inconsistent forming force and springback control between different processes can easily cause instability in the shape of the negative angle structure, or even cracking or excessive springback; and it requires multiple sets of molds and corresponding stamping equipment, occupying more production line resources. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, the technical problem this utility model aims to solve is to propose a stamping device that, through the coordinated design of the folding and bending parts in terms of structural layout and motion sequence, allows the entire forming process, including the two key steps of folding and negative angle bending, to be completed continuously in a single stamping stroke while the workpiece is clamped once. This avoids the problems of accumulated positioning errors, low production efficiency, and multiple equipment occupation caused by the need for multiple clamping and multiple processes to complete folding and negative angle forming in traditional processes.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a stamping device for folding and negative angle bending of workpieces, wherein the stamping device includes:

[0006] A fixed mold assembly is provided with a support base, the support base having a support surface and a contoured surface that matches the target negative angle structure. The support surface is used to provide support for the workpiece, and the part of the workpiece to be folded is located outside the edge of the support surface.

[0007] The moving mold assembly can reciprocate relative to the fixed mold assembly in the vertical direction;

[0008] A folding component, which is disposed on the moving mold assembly, is used to fold the workpiece in the vertical direction;

[0009] A bending component is movably disposed on the side of the support base to apply a bending force to the folded position of the workpiece in the horizontal direction to form a negative angle structure, and the inner wall of the formed negative angle structure is in contact with the contour surface.

[0010] In the above-mentioned stamping device, the moving die assembly is provided with a first moving plate and a second moving plate arranged at intervals along the vertical direction. One end of the folding member is connected to the first moving plate, and the other end moves through the second moving plate and extends toward the fixed die assembly. The first moving plate is used to drive the folding member to move, and the second moving plate abuts against the workpiece placed on the support base to provide vertical fixation for the workpiece.

[0011] In the above-mentioned stamping device, the moving die assembly is provided with a moving die plate and a first elastic member and a second elastic member provided on the moving die plate. One end of the first elastic member is connected to the moving die plate and the other end is connected to the first moving plate. One end of the second elastic member is connected to the moving die plate and the other end moves through the first moving plate and is connected to the second moving plate.

[0012] In the above-mentioned stamping device, a first movable seat is provided on the fixed die assembly, and the bending member is fixedly connected to the first movable seat. The first movable seat is used to drive the bending member to move closer to or away from the workpiece in the horizontal direction.

[0013] In the above-mentioned stamping device, a first drive rod is provided on the moving template, the first drive rod has a first inclined surface, and a second inclined surface corresponding to the first inclined surface is provided on the first moving seat. The first inclined surface and the second inclined surface slide in cooperation to drive the first moving seat to approach the workpiece in the horizontal direction.

[0014] In the above-mentioned stamping device, a third elastic element is provided on the fixed die assembly, one end of which is connected to the first movable seat. When the first movable seat moves closer to the workpiece in the horizontal direction, the third elastic element is stretched and undergoes elastic deformation.

[0015] In the above-mentioned stamping device, the support base is provided with a plurality of mounting slots along the length of the workpiece, and each mounting slot is embedded with a magnetic adsorption component. When the workpiece is placed on the support base, the magnetic adsorption component adsorbs the inner sidewall of the workpiece to perform preliminary positioning of the workpiece.

[0016] In the above-mentioned stamping device, the fixed die assembly is provided with a second movable seat and a clamping block provided on the second movable seat. The clamping block abuts against the side wall of the workpiece in the horizontal direction to fix the workpiece in the horizontal direction. The second movable seat is used to drive the clamping block to move closer to or away from the workpiece in the horizontal direction.

[0017] In the above-mentioned stamping device, a second drive rod is provided on the moving template, a third inclined surface is provided on the second drive rod, and a corresponding fourth inclined surface is provided on the second moving seat. The third inclined surface and the fourth inclined surface are slidably engaged to drive the second moving seat to approach the workpiece in the horizontal direction.

[0018] In the above-mentioned stamping device, a fourth elastic element is further provided between the support base and the second movable base. One end of the fourth elastic element is connected to the support base, and the other end is connected to the second movable base. When the second movable base approaches the workpiece in the horizontal direction, the fourth elastic element is compressed and undergoes elastic deformation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) Through the coordinated design of the structural layout and motion sequence of the folding and bending parts, the entire forming process, including the two key steps of folding and negative angle bending, is completed continuously by a single stamping stroke in the workpiece clamping state. This avoids the problems of positioning error accumulation, low production efficiency and multiple equipment occupation caused by the need for multiple clamping and multiple processes to complete folding and negative angle forming in the traditional process.

[0021] (2) The support base integrates a support surface and a contour surface: the support surface provides stable support for the main body of the workpiece, while the contour surface serves as the reference contour for negative angle forming; during the bending process, the workpiece is pushed by the bending part and gradually fits the contour surface, and the inner curved surface of the final negative angle structure closely matches the contour surface, which not only achieves precise forming limit and effectively suppresses material springback, but also ensures high precision consistency between the forming angle and the geometric shape.

[0022] (3) By the phased relative movement of the first moving plate and the second moving plate in the stamping stroke, and with the buffering, clamping force adaptive adjustment and automatic reset functions provided by the first elastic element and the second elastic element, this utility model realizes the precise timing control of "first clamping and positioning - then independent folding - then collaborative support for negative angle forming", ensuring that the actions of each process do not interfere with each other and are connected in an orderly manner, significantly improving the forming stability and repeatability accuracy. Attached Figure Description

[0023] Figure 1 This is a 3D view of the workpiece in this design.

[0024] Figure 2 This is a 3D view of the proposed solution.

[0025] Figure 3 This is a 3D view of the moving model component in this solution.

[0026] Figure 4 This is a plan view of the moving module component in this solution.

[0027] Figure 5 yes Figure 4 Sectional view of AA.

[0028] Figure 6 This is a 3D view of the fixed mold component in this solution.

[0029] Figure 7 yes Figure 6 A 3D view of the hidden part of the structure.

[0030] Figure 8 This is a three-dimensional view of the support base in this design.

[0031] Figure 9 yes Figure 8 A three-dimensional view of another orientation.

[0032] In the diagram, 100 is the workpiece; 110 is the folding structure; 120 is the negative angle structure; 200 is the fixed mold assembly; 210 is the support base; 211 is the support surface; 212 is the contour surface; 213 is the mounting groove; 220 is the bent part; 230 is the first moving base; 231 is the second inclined surface; 240 is the third elastic element; 250 is the second moving base; 251 is the fourth inclined surface; 260 is the clamping block; 270 is the fourth elastic element; 300 is the moving mold assembly; 310 is the folding part; 320 is the first moving plate; 330 is the second moving plate; 340 is the moving template; 350 is the first elastic element; 360 is the second elastic element; 370 is the first drive rod; 371 is the first inclined surface; 380 is the second drive rod; and 381 is the third inclined surface. Detailed Implementation

[0033] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] like Figures 1 to 9As shown, this solution provides a stamping device for folding and negative angle bending of a workpiece 100. The stamping device includes: a fixed die assembly 200, on which a support base 210 is provided. The support base 210 has a support surface 211 and a contoured surface 212 that matches the target negative angle structure 120. The support surface 211 provides support for the workpiece 100, and the part of the workpiece 100 to be folded is located outside the edge of the support surface 211; a moving die assembly 300, which can reciprocate in the vertical direction relative to the fixed die assembly 200; a folding component 310, which is disposed on the moving die assembly 300 and is used to fold the workpiece 100 in the vertical direction; and a bending component 220, which is movably disposed to the side of the support base 210 and is used to apply a bending force to the folded position of the workpiece 100 in the horizontal direction to form a negative angle structure 120, and the inner wall of the formed negative angle structure 120 is in contact with the contoured surface 212.

[0036] During operation, the workpiece 100 to be processed is first placed stably on the support base 210 on the fixed mold assembly 200. The support surface 211 of the support base 210 provides stable and reliable support for the workpiece 100; the part of the workpiece 100 to be folded extends beyond the edge of the support surface 211, and its root is located exactly at the edge of the support surface 211, so as to obtain the necessary reaction force support during the folding process.

[0037] Subsequently, the moving mold assembly 300 moves downward in the vertical direction under the action of the external driving device. In the initial stage, the folding member 310 set on the moving mold assembly 300 first contacts the part of the workpiece 100 to be folded, and continues to apply a downward force, causing the part to undergo plastic deformation around the edge of the support surface 211, completing the initial folding action and forming the folding structure 110.

[0038] As the moving mold assembly 300 continues to descend, the bending component 220 moves horizontally toward the folded portion of the workpiece 100. Once the bending component 220 reaches the predetermined position, a horizontal bending force is applied to a specific area of ​​the folded structure 110, forcing that area to bend further toward the contour surface 212, ultimately forming a negative angle structure 120 that closely fits the contour of the contour surface 212. During this process, the pre-designed contour surface 212 on the support 210 precisely matches the inner wall contour of the formed negative angle structure 120; the two fit tightly together, not only serving as forming limits but also ensuring the forming angle and shape accuracy.

[0039] Through the coordinated design of the folding component 310 and the bending component 220 in terms of structural layout and motion sequence, the entire forming process, including the two key steps of flanging and negative angle bending, is completed continuously by the same stamping stroke in a single clamping state of the workpiece 100. The inner contour of the negative angle structure 120 fits against the contoured surface 212 on the support 210, which not only ensures that the final geometry is consistent with the design target, but also disperses local stress through surface contact, reducing the risk of material cracking or wrinkling. It is especially suitable for negative angle forming of high-strength thin plates or precision sheet metal parts.

[0040] This design avoids the problems of accumulated positioning errors, low production efficiency, and high equipment occupancy caused by the need for multiple clamping and separate processes to complete the flanging and negative angle bending in traditional processes. At the same time, because the forming process is controlled and the components are precisely matched, the dimensional consistency, surface quality, and overall forming accuracy of the product are significantly improved. It is especially suitable for mass production scenarios of precision stamping parts with high requirements for structural complexity and manufacturing precision.

[0041] To achieve the folding operation of the workpiece 100, the moving mold assembly 300 is provided with a first moving plate 320 and a second moving plate 330 arranged at intervals in the vertical direction. One end of the folding member 310 is connected to the first moving plate 320, and the other end moves through the second moving plate 330 and extends into the fixed mold assembly 200. The first moving plate 320 is used to drive the folding member 310 to move, and the second moving plate 330 abuts against the workpiece 100 placed on the support base 210 to provide vertical fixation for the workpiece 100.

[0042] Furthermore, the moving mold assembly 300 is provided with a moving template 340 and a first elastic element 350 and a second elastic element 360 disposed on the moving template 340. One end of the first elastic element 350 is connected to the moving template 340, and the other end is connected to the first moving plate 320. One end of the second elastic element 360 is connected to the moving template 340, and the other end movably passes through the first moving plate 320 and is connected to the second moving plate 330. Preferably, the first elastic element 350 and the second elastic element 360 are nitrogen springs.

[0043] During operation, the moving template 340 descends vertically towards the fixed template assembly 200 under external drive. In the initial stage, the first moving plate 320 and the second moving plate 330 descend together with the moving template 340. Since the second moving plate 330 is located below, it first contacts the upper surface of the workpiece 100 and presses the workpiece 100 against the support base 210, thus achieving vertical fixation.

[0044] Subsequently, the moving template 340 continues to descend, but the second moving plate 330 stops moving due to the obstruction of the workpiece 100. The relative displacement between the moving template 340 and the second moving plate 330 causes the second elastic element 360 to be compressed and store energy. At the same time, the first moving plate 320 continues to descend under the action of the moving template 340, causing the folding element 310 to contact the part of the workpiece 100 to be folded and apply a downward force to it, completing the folding and forming.

[0045] When the first moving plate 320 descends to contact the second moving plate 330, the two form a rigid linkage, and the folding component 310 reaches the end of its downward stroke, completing the folding action. Afterward, the moving template 340 continues to descend, and the bending component 220 applies a horizontal bending force to the folded part, causing it to conform to the contour surface 212 on the support base 210, ultimately forming a negative angle structure 120. During this process, the first moving plate 320 and the second moving plate 330 jointly press the workpiece 100, and the first elastic component 350 and the second elastic component 360 are further compressed, providing a stable reverse support force to prevent the workpiece 100 from warping, slipping, or springing back under the action of the horizontal bending force. Since the folding component 310 has stopped moving through mechanical limit, its position is fixed and will not interfere with the horizontal movement of the bending component 220.

[0046] After the stamping process is completed, the moving die plate 340 begins to move in the opposite direction, moving away from the fixed die assembly 200 in the vertical direction. At this time, the compressed first elastic element 350 and second elastic element 360 release their elastic potential energy, and the first moving plate 320 and second moving plate 330 return to their original positions. The folded part 310 retracts with the first moving plate 320, the second moving plate 330 detaches from the surface of the workpiece 100, and the entire moving die assembly 300 returns to its initial position, ready for the next stamping cycle.

[0047] Through the phased relative movement of the first moving plate 320 and the second moving plate 330 during the stamping stroke, combined with the controllable buffering, clamping force adjustment and automatic reset functions provided by the first elastic element 350 and the second elastic element 360, the stamping device in this solution achieves highly coordinated and time-precise multi-process integrated control.

[0048] In order to move the bending part 220, a first movable seat 230 is provided on the fixed mold assembly 200. The bending part 220 is fixedly connected to the first movable seat 230. The first movable seat 230 is used to move the bending part 220 closer to or further away from the workpiece 100 in the horizontal direction.

[0049] Furthermore, the moving template 340 is provided with a first drive rod 370, the first drive rod 370 has a first inclined surface 371, and the first moving seat 230 is provided with a second inclined surface 231 corresponding to the first inclined surface 371. The first inclined surface 371 and the second inclined surface 231 are slidably engaged to drive the first moving seat 230 to approach the workpiece 100 in the horizontal direction.

[0050] More preferably, the fixed mold assembly 200 is provided with a third elastic element 240, one end of which is connected to the side of the first movable seat 230 away from the workpiece 100. When the first movable seat 230 moves toward the workpiece 100, the third elastic element 240 is stretched and stores elastic potential energy; the third elastic element 240 can be a nitrogen spring or a helical spring.

[0051] After the folding operation is completed, the first moving plate 320 and the second moving plate 330 form a rigid contact and stop descending due to the obstruction of the workpiece 100; the moving template 340 continues to descend under external drive, and achieves relative displacement between itself and the first moving plate 320 and the second moving plate 330 by compressing the first elastic element 350 and the second elastic element 360, and drives the first drive rod 370 to continue descending; at this time, the first inclined surface 371 of the first drive rod 370 contacts and slides with the second inclined surface 231 of the first moving seat 230, pushing the first moving seat 230 to drive the bending element 220 to apply a horizontal bending force to the folded part of the workpiece 100, forming a negative angle structure 120, and the inner contour of the negative angle structure 120 fits with the contoured surface 212 on the support seat 210.

[0052] As the first movable seat 230 approaches the workpiece 100, the third elastic element 240 connected to the side of the first movable seat 230 away from the workpiece 100 is stretched and stores elastic potential energy. After forming is completed, the moving template 340 returns upward, and the first drive rod 370 moves upward accordingly. Its first inclined surface 371 slides relative to the second inclined surface 231 of the first movable seat 230 and gradually disengages from contact. The third elastic element 240 releases the stored elastic potential energy, pushing the first movable seat 230 away from the workpiece 100 in the horizontal direction and automatically resetting to the initial position.

[0053] After folding, the folded part 310 is mechanically limited and fixed in position through the rigid contact of the first moving plate 320 and the second moving plate 330. The bent part 220, on the other hand, is triggered to move horizontally in subsequent strokes by the downward movement of the moving die plate 340 through the cooperation of the first inclined surface 371 and the second inclined surface 231. The folded part 310 and the bent part 220 are completely decoupled in space and time, completely avoiding the risk of motion interference. The downward movement of the moving die plate 340 automatically converts the vertical main stroke into the horizontal movement required for bending through the inclined surface cooperation, eliminating the need for an additional horizontal drive source. This results in a compact structure, synchronous response, easy maintenance, and high reliability as the action sequence is naturally controlled by the die stroke. The third elastic element 240 stores energy during the forming process and reliably resets the first moving seat 230 when the moving die assembly 300 returns, ensuring that the bent part 220 is in its initial position before each stamping cycle without manual intervention, which is beneficial for achieving high-speed, continuous, and automated stamping operations.

[0054] In order to achieve the initial positioning of the workpiece 100, the support base 210 is provided with a number of mounting slots 213 along the length of the workpiece 100. Each mounting slot 213 is embedded with a magnetic adsorption component. When the workpiece 100 is placed on the support base 210, the magnetic adsorption component adsorbs the inner wall of the workpiece 100 to prevent the workpiece 100 from moving or shifting before stamping.

[0055] By integrating a magnetic adsorption component onto the support base 210, the workpiece 100 can be instantly adsorbed and fixed after placement, significantly improving loading efficiency. The number and position of the mounting slots 213 can be flexibly adjusted according to the size of the workpiece 100, adapting to various product models and improving mold versatility. The magnetic adsorption component can effectively adsorb workpieces 100 made of magnetizable materials; for non-magnetic materials, a vacuum adsorption unit or elastic positioning pin can be used to achieve a similar positioning function.

[0056] Furthermore, the fixed mold assembly 200 is provided with a second movable seat 250 and a clamping block 260 provided on the second movable seat 250. The clamping block 260 abuts against the side wall of the workpiece 100 in the horizontal direction and is used to fix the workpiece 100 in the horizontal direction. The second movable seat 250 is used to drive the clamping block 260 to move closer to or away from the workpiece 100 in the horizontal direction.

[0057] Furthermore, a second drive rod 380 is provided on the moving template 340, a third inclined surface 381 is provided on the second drive rod 380, and a corresponding fourth inclined surface 251 is provided on the second moving seat 250. The third inclined surface 381 and the fourth inclined surface 251 are slidably engaged to drive the second moving seat 250 to approach the workpiece 100 in the horizontal direction.

[0058] Furthermore, a fourth elastic element 270 is provided between the support base 210 and the second movable base 250. One end of the fourth elastic element 270 is connected to the support base 210, and the other end is connected to the second movable base 250. When the second movable base 250 approaches the workpiece 100 in the horizontal direction, the fourth elastic element 270 is compressed and undergoes elastic deformation. The fourth elastic element 270 can be a nitrogen spring or a helical spring.

[0059] The length of the second drive rod 380 is greater than the length of the first drive rod 370. When the moving template 340 is driven by the external drive device to approach the fixed mold assembly 200, the second drive rod 380 first acts on the second moving seat 250. After the workpiece 100 is placed on the support seat 210 and attracted by the magnetic adsorption component, the moving template 340 moves downward, and the third inclined surface 381 on the second drive rod 380 contacts and slides relative to the fourth inclined surface 251 on the second moving seat 250, thereby pushing the second moving seat 250 and the clamping block 260 to approach the side wall of the workpiece 100 away from the folding area in the horizontal direction until the clamping block 260 abuts against the side wall of the workpiece 100; at this time, the workpiece 100 is clamped between the support seat 210 and the clamping block 260 in the horizontal direction, achieving reliable fixation and providing stable support for the subsequent folding and negative angle forming.

[0060] As the second movable seat 250 approaches the workpiece 100, the fourth elastic element 270, located between the support seat 210 and the second movable seat 250, is compressed, undergoes elastic deformation, and stores elastic potential energy. After the stamping operation is completed, the moving template 340 returns upward, and the second drive rod 380 moves upward accordingly. Its third inclined surface 381 slides relative to the fourth inclined surface 251 of the second movable seat 250 and gradually disengages from contact. The fourth elastic element 270 recovers its elastic deformation, pushes the second movable seat 250 to reset, and drives the clamping block 260 away from the processed workpiece 100, releasing the clamping of the workpiece 100.

[0061] The combination of the magnetic adsorption of the support base 210 and the horizontal clamping of the clamping block 260 forms a composite positioning mode, which effectively restricts the workpiece's 100 degrees of freedom and significantly improves the clamping stability.

[0062] By setting the second drive rod 380 to be longer than the first drive rod 370, it is ensured that the workpiece 100 is firmly fixed in the horizontal direction before the folding action is started, thereby avoiding the slippage, deflection or twisting of the workpiece 100 due to lateral bending force during the forming process, and ensuring the geometric accuracy of the folding angle and negative angle.

[0063] The entire clamping mechanism is highly integrated, requiring no additional external drive components such as cylinders, motors, or hydraulic systems. It fully utilizes the main stroke of the moving platen 340 to automatically trigger the horizontal clamping and resetting actions through the inclined plane mechanism. This not only simplifies the mold structure and reduces the failure rate, but also ensures that the clamping sequence is strictly synchronized with the main stroke, resulting in reliable response.

[0064] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0066] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A stamping device for folding and negative angle bending of workpieces, characterized in that, The stamping device includes: A fixed mold assembly is provided with a support base, the support base having a support surface and a contoured surface that matches the target negative angle structure. The support surface is used to provide support for the workpiece, and the part of the workpiece to be folded is located outside the edge of the support surface. The moving mold assembly can reciprocate relative to the fixed mold assembly in the vertical direction; A folding component, which is disposed on the moving mold assembly, is used to fold the workpiece in the vertical direction; A bending component is movably disposed on the side of the support base to apply a bending force to the folded position of the workpiece in the horizontal direction to form a negative angle structure, and the inner wall of the formed negative angle structure is in contact with the contour surface.

2. The stamping device as described in claim 1, characterized in that, The moving mold assembly is provided with a first moving plate and a second moving plate arranged at intervals along the vertical direction. One end of the folding member is connected to the first moving plate, and the other end moves through the second moving plate and extends toward the fixed mold assembly. The first moving plate is used to drive the folding member to move, and the second moving plate abuts against the workpiece placed on the support base to provide vertical fixation for the workpiece.

3. The stamping device as described in claim 2, characterized in that, The moving mold assembly is provided with a moving template and a first elastic member and a second elastic member disposed on the moving template. One end of the first elastic member is connected to the moving template and the other end is connected to the first moving plate. One end of the second elastic member is connected to the moving template and the other end moves through the first moving plate and is connected to the second moving plate.

4. The stamping device as described in claim 3, characterized in that, The fixed mold assembly is provided with a first movable seat, and the bending component is fixedly connected to the first movable seat. The first movable seat is used to drive the bending component to move closer to or away from the workpiece in the horizontal direction.

5. The stamping device as described in claim 4, characterized in that, The moving template is provided with a first driving rod, which has a first inclined surface. The first moving seat is provided with a second inclined surface corresponding to the first inclined surface. The first inclined surface and the second inclined surface slide together to drive the first moving seat to approach the workpiece in the horizontal direction.

6. The stamping device as described in claim 4, characterized in that, The fixed mold assembly is provided with a third elastic element, one end of which is connected to the first movable seat. When the first movable seat moves closer to the workpiece in the horizontal direction, the third elastic element is stretched and undergoes elastic deformation.

7. The stamping device as described in claim 1, characterized in that, The support base has several mounting slots along the length of the workpiece, and each mounting slot is embedded with a magnetic adsorption component. When the workpiece is placed on the support base, the magnetic adsorption component adsorbs the inner wall of the workpiece to perform preliminary positioning of the workpiece.

8. The stamping device as described in claim 3, characterized in that, The fixed mold assembly is provided with a second movable seat and a clamping block provided on the second movable seat. The clamping block abuts against the side wall of the workpiece in the horizontal direction to fix the workpiece in the horizontal direction. The second movable seat is used to drive the clamping block to move closer to or away from the workpiece in the horizontal direction.

9. The stamping device as described in claim 8, characterized in that, The moving template is provided with a second driving rod, the second driving rod is provided with a third inclined surface, and the second moving seat is provided with a corresponding fourth inclined surface. The third inclined surface and the fourth inclined surface slide in cooperation to drive the second moving seat to approach the workpiece in the horizontal direction.

10. The stamping device as described in claim 8, characterized in that, A fourth elastic element is also provided between the support base and the second movable base. One end of the fourth elastic element is connected to the support base, and the other end is connected to the second movable base. When the second movable base approaches the workpiece in the horizontal direction, the fourth elastic element is compressed and undergoes elastic deformation.

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