A punching device for door frame outer plate

Abstract

The present application relates to the technical field of workpiece manufacturing, and provides a stamping device for a door frame outer plate, which is used for boss forming and square hole punching of the door frame outer plate. The stamping device comprises an upper die assembly and a lower die assembly, and the door frame outer plate is placed on the lower die assembly. The upper die assembly is sequentially provided with a fixed plate, an adjusting plate and a pressure plate from top to bottom. One end of a stamping part is fixed to the adjusting plate, and the other end is slidably arranged through the pressure plate. One end of a punching part is fixed to the fixed plate, and the other end sequentially passes through the adjusting plate and the pressure plate. In the open mold state, the lower end surface of the stamping part is lower than the lower end surface of the punching part. When the mold is closed, the pressure plate first contacts the door frame, then the adjusting plate moves relative to the pressure plate to drive the stamping part to complete the boss forming, and then the fixed plate moves relative to the adjusting plate and the pressure plate to drive the punching part to punch the square hole. The three-stage action of pressure, forming and punching is integrated in a single mold closing stroke, and the quality of boss forming and square hole punching is ensured through process timing control.

Description

Technical Field

[0001] This invention belongs to the field of workpiece manufacturing technology, and specifically relates to a stamping device for door frame outer panels. Background Technology

[0002] As a key covering component in the structure, the outer panel of the door frame usually needs to have bosses on its surface to enhance local rigidity or for assembly connections. At the same time, square holes need to be opened to meet functional requirements such as wire harness passage, drainage, or installation of accessories.

[0003] In existing manufacturing processes, boss forming and square hole punching are usually treated as two separate stamping processes, requiring the use of two sets of dedicated dies, and sometimes even needing to be completed sequentially on different stamping equipment. Specifically, the traditional process usually involves first completing the square hole punching with a punching die, and then transferring the workpiece to the next station (which may be after changing dies on the same equipment or on another piece of equipment), where the boss is pressed using a forming die.

[0004] This step-by-step processing method not only increases the investment in molds and equipment and the space occupied, but also causes cumulative positioning errors due to multiple clamping, affecting the dimensional accuracy and consistency of the products; at the same time, the transfer between processes also reduces production efficiency and increases manufacturing costs.

[0005] To address these issues, the industry has attempted to develop composite molds to integrate forming and punching. However, boss forming involves localized deep drawing or upsetting plastic deformation, requiring controlled material flow under effective blanking conditions to prevent wrinkling or cracking; while punching is a shearing and separation process, relying on precise blanking clearance and timely unloading. The two differ significantly in blanking force requirements, action sequence, and mold stress characteristics.

[0006] If the forming punch and the punching punch are simply rigidly integrated into the same mold frame without setting the action timing control, the following problems are likely to occur due to the lack of coordination between the two movements: (1) The punching action occurs before the boss forming is completed, prematurely cutting off the continuity of the material or weakening the support around the forming area, causing the boss to collapse or be not fully formed due to insufficient material supply; (2) During the boss forming process, local sheet metal bulges or stress concentration occurs, which leads to a decrease in the support stiffness of the punching area, which in turn causes defects such as increased punching burrs, collapsed hole corners or positional deviations. Summary of the Invention

[0007] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a stamping device for door frame outer panels. This device comprises a fixed plate, an adjusting plate, and a pressure plate arranged sequentially from top to bottom in an upper die assembly, all of which are movable relative to each other. In the open die state, the lower end face of the stamped part is lower than the lower end face of the punched part. During die closing, the pressure plate first contacts the door frame, then the adjusting plate moves relative to the pressure plate, driving the stamped part to complete the boss formation. Next, the fixed plate moves relative to the adjusting plate and the pressure plate, driving the punched part to perform square hole punching. This integrates the three stages of pressure, forming, and punching within a single die closing stroke, and through process timing control, ensures the quality of boss formation and square hole punching.

[0008] The technical solution adopted by this invention to solve its technical problem is to propose a stamping device for door frame outer panels, used for forming bosses and punching square holes in the door frame outer panels, the stamping device comprising:

[0009] The upper mold assembly is provided with a fixed plate, an adjusting plate and a pressure plate arranged at intervals along the vertical direction;

[0010] The lower mold assembly is arranged vertically opposite to the upper mold assembly, and the upper mold assembly is movable relative to the lower mold assembly. The outer panel of the door frame is placed on the lower mold assembly.

[0011] A stamping part, one end of which is disposed on the adjusting plate and the other end of which is slidably passed through the pressure plate. The adjusting plate can move relative to the pressure plate to drive the stamping part to form a boss on the outer panel of the door frame.

[0012] A punching component, one end of which is disposed on the fixed plate, and the other end passes through the adjusting plate and slides through the pressure plate. The fixed plate can move relative to the adjusting plate and the pressure plate to drive the punching component to punch square holes in the outer panel of the door frame.

[0013] The upper mold assembly and the lower mold assembly have a mold-closed state and a mold-open state. When in the mold-open state, the lower end face of the stamping part is located below the lower end face of the punching part, so that the stamping part acts on the outer panel of the door frame before the punching part.

[0014] When in the mold-closed state, the upper mold assembly drives the fixing plate, the adjusting plate and the pressure plate to move towards the lower mold assembly. The pressure plate abuts against the outer panel of the door frame to fix the outer panel of the door frame in the vertical direction.

[0015] In the above-mentioned stamping device for door frame outer panel, the upper die assembly is provided with a first elastic element. One end of the first elastic element is connected to the fixed plate, and the other end passes through the through hole on the adjusting plate and is connected to the pressure plate. A gap is left between the through hole and the first elastic element to allow relative movement between the adjusting plate and the first elastic element.

[0016] In the above-mentioned stamping device for the outer panel of a door frame, the upper die assembly is further provided with a second elastic element, one end of which is connected to the fixed plate and the other end is connected to the adjusting plate.

[0017] In the above-mentioned stamping device for door frame outer panel, a support block is also provided on the lower die assembly. The support block is located below the area to be formed of the door frame outer panel and is used to provide support for the area to be formed of the door frame outer panel during the forming process.

[0018] In the above-mentioned stamping device for door frame outer panel, the support block is provided with a support groove and a through guide groove, and the profile of the support groove matches the back contour of the formed boss. The inlet end of the guide groove is located directly below the punching part, and is used to receive the waste generated by punching and discharge it.

[0019] In the above-mentioned stamping device for door frame outer panel, the lower end face of the pressure plate is provided with an abutment portion, which abuts against the door frame outer panel.

[0020] In the above-mentioned stamping device for door frame outer panel, the lower die assembly is further provided with a support base, and the door frame outer panel is placed on the support base.

[0021] In the aforementioned stamping device for a door frame outer panel, the lower die assembly is further provided with:

[0022] The first positioning block is fixedly mounted on the support base and abuts against one side of the outer panel of the door frame in the horizontal direction;

[0023] The second positioning block is disposed opposite to the first positioning block and can move horizontally to abut against the other side of the outer panel of the door frame.

[0024] In the above-mentioned stamping device for door frame outer panel, the lower die assembly is further provided with a driving member, and the second positioning block is connected to the output end of the driving member. The driving member is used to drive the second positioning block to move closer to or away from the door frame outer panel.

[0025] In the above-mentioned stamping device for door frame outer panel, the lower die assembly is further provided with a contour block, the contour block having a contour part that matches the bottom contour of the door frame outer panel, for supporting and assisting in positioning the door frame outer panel.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The upper mold assembly consists of a fixed plate, an adjusting plate, and a pressure plate arranged sequentially from top to bottom, and the three can move relative to each other. When the mold is closed, the pressure plate first contacts the outer panel of the door frame and applies a continuous clamping force; then, the adjusting plate continues to move relative to the pressure plate, and drives the stamping part to complete the boss forming first. After the forming is completed and the adjusting plate moves down to the end of the stroke, the fixed plate continues to move down relative to the adjusting plate and the pressure plate, driving the punching part to perform square hole punching. This structure integrates the three-stage actions of pressure, forming and punching within a single mold closing stroke, eliminating the need for multiple clamping or transfer, ensuring consistent positioning reference, and significantly improving product dimensional accuracy and production efficiency; at the same time, through process timing control, it effectively avoids defects such as boss collapse and shape distortion caused by premature material cutting during punching, as well as punching burrs caused by forming interference.

[0028] (2) The first elastic element connects the fixed plate and the pressure plate. It is compressed during the pressing stage to provide stable clamping force, preventing warping, slippage, or wrinkling of the outer panel of the door frame during forming, and saving upper die space. The second elastic element connects the fixed plate and the adjusting plate. It is compressed after stamping to provide pre-pressure and buffer for punching, reducing impact, vibration, and noise, and extending die life. The two work together to realize the three-level sequential action of "pressing, stamping, and punching". The process sequence can be accurately controlled by the stiffness and pre-compression amount of the first and second elastic elements. No additional control system is required. Multi-process integrated processing is completed in a single mold closing, which significantly improves efficiency, accuracy, and product consistency.

[0029] (3) Vertical clamping and fixing are achieved through the contact part on the support base and the pressure plate; the fixed first positioning block and the driven second positioning block achieve automatic clamping and repeated positioning in the horizontal direction; the contour block fits the bottom contour of the door frame outer panel, providing auxiliary support and initial limit; through the above design, the door frame outer panel is effectively constrained in multiple directions, which greatly improves the clamping and repeated positioning accuracy; automatic clamping ensures the consistency of clamping force; local contour pressing not only prevents wrinkling and warping, but also avoids surface indentation. Attached Figure Description

[0030] Figure 1 This is a 3D view of the outer panel of the door frame in this design.

[0031] Figure 2 This is a 3D view of the proposed solution.

[0032] Figure 3This is a 3D view of the upper mold component in this solution.

[0033] Figure 4 yes Figure 3 A floor plan showing the hidden structural elements.

[0034] Figure 5 yes Figure 4 Sectional view of AA.

[0035] Figure 6 yes Figure 4 A cross-sectional view of BB.

[0036] Figure 7 yes Figure 1 A 3D view of the hidden part of the structure.

[0037] Figure 8 yes Figure 7 A 3D view of the hidden part of the structure.

[0038] In the figure, 100 is the outer panel of the door frame; 110 is the boss; 120 is the square hole; 200 is the upper mold assembly; 210 is the fixing plate; 220 is the adjusting plate; 230 is the pressure plate; 231 is the abutment part; 240 is the first elastic element; 250 is the second elastic element; 300 is the lower mold assembly; 310 is the support block; 311 is the support groove; 312 is the guide groove; 320 is the support seat; 321 is the first positioning block; 330 is the second positioning block; 340 is the driving element; 350 is the contour block; 351 is the contour part; 400 is the stamping part; and 500 is the punching part. Detailed Implementation

[0039] 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.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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 indication will also change accordingly.

[0041] like Figures 1 to 8As shown, this solution provides a stamping device for a door frame outer panel, used to form bosses 110 and punch square holes 120 on the door frame outer panel 100. The stamping device includes: an upper die assembly 200, on which a fixed plate 210, an adjusting plate 220, and a pressure plate 230 are arranged sequentially and spaced apart along the vertical direction; a lower die assembly 300, which is arranged opposite to the upper die assembly 200 along the vertical direction, and the upper die assembly 200 is movable relative to the lower die assembly 300, with the door frame outer panel 100 placed on the lower die assembly 300; and a stamped part 40. 0, one end of which is set on the adjusting plate 220 and the other end is slidably passed through the pressure plate 230. The adjusting plate 220 can move relative to the pressure plate 230 to drive the stamping part 400 to form the boss 110 on the outer panel 100 of the door frame; the punching part 500, one end of which is set on the fixing plate 210 and the other end passes through the adjusting plate 220 and slidably passes through the pressure plate 230. The fixing plate 210 can move relative to the adjusting plate 220 and the pressure plate 230 to drive the punching part 500 to punch the square hole 120 on the outer panel 100 of the door frame.

[0042] The upper mold assembly 200 and the lower mold assembly 300 have a closed mold state and an open mold state. When in the open mold state, the lower end face of the stamping part 400 is located below the lower end face of the punching part 500, so that the stamping part 400 acts on the door frame outer panel 100 before the punching part 500. When in the closed mold state, the upper mold assembly 200 drives the fixing plate 210, the adjusting plate 220 and the pressure plate 230 to move towards the lower mold assembly 300. The pressure plate 230 abuts against the door frame outer panel 100 to fix the door frame outer panel 100 in the vertical direction.

[0043] The upper die assembly 200 is mounted on the press platen. During operation, the upper die assembly 200 and the lower die assembly 300 are in the open state, at which time the lower end face of the stamped part 400 is located below the lower end face of the punched part 500. After the door frame outer panel 100 is placed on the lower die assembly 300, the press platen drives the upper die assembly 200 to move towards the lower die assembly 300, and the fixed plate 210, adjusting plate 220 and pressure plate 230 move downward synchronously in the initial stage.

[0044] During the downward movement, the pressure plate 230 first contacts the outer panel 100 of the door frame and continuously applies a clamping force to it, reliably clamping the outer panel 100 between the pressure plate 230 and the lower die assembly 300 to prevent displacement or wrinkling during the forming process. Subsequently, the pressure plate 230 stops moving downward due to the obstruction of the outer panel 100, while the adjusting plate 220 and the fixing plate 210, driven by the continued operation of the press, respectively drive the stamping part 400 and the cutting part 500 to continue moving downward relative to the pressure plate 230. Since the lower end face of the stamping part 400 is lower than the lower end face of the cutting part 500, the stamping action precedes the cutting action, forming the boss 110 on the outer panel 100 of the door frame.

[0045] Once the boss 110 is formed, the adjusting plate 220 contacts the pressure plate 230 and reaches the preset stroke endpoint, then stops relative movement. Afterward, the fixing plate 210 continues to descend, driving the punching part 500 to punch the square hole 120 in the area to be punched on the outer panel 100 of the door frame, completing all processing.

[0046] This device can continuously complete the forming of the boss 110 and the punching of the square hole 120 within a single mold closing stroke, eliminating the need for multiple clamping or inter-process transfer of the door frame outer panel 100. This effectively ensures the consistency of the positioning reference and improves product dimensional accuracy and production efficiency. Simultaneously, by controlling the stamping and punching actions in stages, it ensures that the boss 110 is fully formed before punching, effectively avoiding defects such as boss 110 collapse and shape distortion caused by premature material cutting during punching, as well as punching burrs caused by forming interference.

[0047] More preferably, the upper mold assembly 200 is provided with a first elastic member 240, one end of the first elastic member 240 is connected to the fixed plate 210, and the other end passes through the through hole on the adjusting plate 220 and is connected to the pressure plate 230. A gap is left between the through hole and the first elastic member 240 to allow relative movement between the adjusting plate 220 and the first elastic member 240.

[0048] More preferably, the upper mold assembly 200 is further provided with a second elastic element 250, one end of which is connected to the fixed plate 210 and the other end is connected to the adjusting plate 220.

[0049] During the mold closing process, the pressure plate 230 first contacts the outer door frame panel 100 placed on the lower mold assembly 300. Subsequently, the upper mold assembly 200 continues to descend under the drive of the press block, causing the fixed plate 210 and the adjusting plate 220 to move downwards. At this time, the pressure plate 230 stops descending due to the obstruction of the outer door frame panel 100, while the fixed plate 210 continues to descend, causing the first elastic element 240 to be compressed and undergo elastic deformation, thereby applying a continuous downward clamping force to the pressure plate 230. This clamping force effectively prevents the outer door frame panel 100 from warping, horizontal displacement, or local wrinkling during the forming process, and also helps to control the flow of material around the forming area of ​​the boss 110, improving forming accuracy and surface quality.

[0050] As the upper mold assembly 200 continues to descend, the adjusting plate 220 drives the stamping part 400 to move downward, forming the boss 110 on the outer panel 100 of the door frame; while the punching part 500 descends together with the fixing plate 210, since the lower end face of the stamping part 400 is lower than the lower end face of the punching part 500, the punching part 500 has not yet contacted the outer panel 100 of the door frame at this stage and does not participate in the forming process.

[0051] When the protrusion 110 is formed, the adjusting plate 220 just descends to contact the pressure plate 230 and reaches the preset end of the stroke. Its movement relative to the pressure plate 230 is restricted and it stops descending. At this time, the fixed plate 210 continues to move downward relative to the adjusting plate 220 under the continuous drive of the punch press, thereby compressing the second elastic member 250 located between the two, causing it to undergo elastic deformation and store energy.

[0052] Subsequently, the fixed plate 210 drives the punching part 500 to continue descending, punching the square hole 120 into the door frame outer panel 100, which has already had the boss 110 formed. The second elastic element 250 not only provides stable preload and buffering for the punching action, but also effectively absorbs the impact load during punching, reduces mold vibration and noise, and extends mold life.

[0053] The elastic pressing mechanism formed by the first elastic element 240 and the punching action controlled by the second elastic element 250 form an orderly synergy: the three stages of pressing, punching, and punching are triggered sequentially without interference. This not only ensures that multiple processes are completed with high precision within a single mold closing stroke, but also significantly improves production cycle time and equipment utilization, while avoiding positioning errors caused by process separation, thus improving product consistency and yield. Preferably, both the first elastic element 240 and the second elastic element 250 are springs.

[0054] To provide effective support for the area to be formed of the outer panel 100 of the door frame, a support block 310 is provided on the lower die assembly 300. The support block 310 is provided with a support groove 311 and a guide groove 312 arranged in parallel. The profile of the support groove 311 is adapted to the back contour of the protrusion 110 area of ​​the outer panel 100 of the door frame, so as to provide uniform reaction force support during the stamping process. The guide groove 312 penetrates through the body of the support block 310, and its inlet end is located directly below the punching part 500, so as to promptly discharge the waste generated by punching out of the die.

[0055] The support groove 311 precisely matches the back contour of the boss 110, providing local rigid support during the forming process of the boss 110, effectively suppressing excessive material stretching or local collapse, and significantly improving forming accuracy and geometric stability. The guide groove 312 is directly opposite the punching position and passes through the support block 310, ensuring that punching waste is quickly discharged under gravity or auxiliary airflow, avoiding mold jamming, secondary stamping, or damage to the surface of the door frame outer panel 100 caused by waste retention. In addition, the support and waste discharge functions are integrated into the same support block 310, which not only saves the lower mold space, but also ensures the positional consistency between the forming support area and the punching waste discharge area, improving the reliability of multi-process collaborative processing.

[0056] More preferably, the lower end face of the pressure plate 230 is provided with an abutment portion 231, which abuts against the outer panel 100 of the door frame. The abutment portion 231 may be a partially raised, polished wear-resistant insert or a contoured contact surface that matches the outline of the outer panel 100 of the door frame. Its contact area is optimized to ensure effective transmission of the clamping force while avoiding indentations or scratches on the surface of the outer panel 100 of the door frame due to hard contact or stress concentration.

[0057] Since the contact part 231 acts precisely around the critical forming area of ​​the outer panel 100 of the door frame, it can significantly improve the local pressing rigidity and positioning accuracy, and effectively suppress wrinkling, warping or displacement caused by uneven material flow during the stamping process.

[0058] Furthermore, by limiting the pressure application area to the contact portion 231, rather than the entire bottom surface of the pressure plate 230, the risks of ineffective clamping and surface dragging caused by large-area contact can be avoided, which helps to optimize the distribution of pressure force and reduce unnecessary energy loss. In multi-process integrated stamping, this structure can also form a precise upper and lower die fit relationship with the lower die support block 310, further ensuring the positional consistency of the boss 110 forming and the square hole 120 punching, and improving the product's dimensional stability and assembly adaptability.

[0059] More preferably, the lower mold assembly 300 is further provided with a support base 320, the support base 320 having an installation groove, and the support block 310 being embedded in the installation groove. The outer panel 100 of the door frame is placed on the support block 310, with its processing area facing the support surface of the support block 310.

[0060] More preferably, the lower mold assembly 300 is further provided with: a first positioning block 321, which is fixedly mounted on the support base 320 and abuts against one side of the door frame outer panel 100 in the horizontal direction; a second positioning block 330, which is disposed opposite to the first positioning block 321 and can move in the horizontal direction to abut against the other side of the door frame outer panel 100; the first positioning block 321 and the second positioning block 330 work together to limit and clamp the door frame outer panel 100 in the horizontal direction.

[0061] In order to drive the second positioning block 330 to move, a driving component 340 is also provided on the lower mold assembly 300. The second positioning block 330 is connected to the output end of the driving component 340. The driving component 340 is used to drive the second positioning block 330 to move closer to or away from the door frame outer panel 100.

[0062] More preferably, the lower mold assembly 300 is further provided with a contour block 350, which has a contour part 351 that matches the bottom contour of the door frame outer panel 100, for supporting and assisting in positioning the door frame outer panel 100.

[0063] When the upper mold assembly 200 and the lower mold assembly 300 are in the open mold state, the outer door frame panel 100 is placed on the lower mold assembly 300, with one end supported on the support base 320 and the other end placed on the contour block 350. The contour part 351 on the contour block 350 fits into the contour of the bottom surface of the outer door frame panel 100, achieving support and initial positioning of the outer door frame panel 100. At the same time, one edge of the outer door frame panel 100 abuts against the first positioning block 321, completing the initial positioning. Subsequently, the drive unit 340 is activated, driving the second positioning block 330 to move towards the other edge of the outer door frame panel 100 until it is pressed tightly, thereby completing stable clamping in the horizontal direction. The drive unit 340 can be a motor or a cylinder.

[0064] Through the coordinated operation of the first positioning block 321, the second positioning block 330, and the contour block 350, the door frame outer panel 100 is effectively constrained in multiple degrees of freedom, improving the clamping repeatability and positioning accuracy. The second positioning block 330 is automatically clamped by the drive component 340, ensuring the consistency of clamping force and reducing deviations caused by manual intervention. The precise fit between the contour block 350 and the contour of the door frame outer panel 100 helps to ensure the relative positional accuracy between the forming of the boss 110 and the punching of the square hole 120, making it suitable for automated mass production of automotive body panels with high requirements for dimensional stability.

[0065] It should be noted that in this invention, 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 that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. 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 specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If 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 the present invention.

[0067] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention 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 the invention or exceeding the scope defined by the appended claims.

Claims

1. A stamping device for a door frame outer panel, used for forming bosses and punching square holes in the door frame outer panel, characterized in that, The stamping device includes: The upper mold assembly is provided with a fixed plate, an adjusting plate and a pressure plate arranged at intervals along the vertical direction; The lower mold assembly is arranged vertically opposite to the upper mold assembly, and the upper mold assembly is movable relative to the lower mold assembly. The outer panel of the door frame is placed on the lower mold assembly. A stamping part, one end of which is disposed on the adjusting plate and the other end of which is slidably passed through the pressure plate. The adjusting plate can move relative to the pressure plate to drive the stamping part to form a boss on the outer panel of the door frame. A punching component, one end of which is disposed on the fixed plate, and the other end passes through the adjusting plate and slides through the pressure plate. The fixed plate can move relative to the adjusting plate and the pressure plate to drive the punching component to punch square holes in the outer panel of the door frame. The upper mold assembly and the lower mold assembly have a mold-closed state and a mold-open state. When in the mold-open state, the lower end face of the stamping part is located below the lower end face of the punching part, so that the stamping part acts on the outer panel of the door frame before the punching part. When in the mold-closed state, the upper mold assembly drives the fixed plate, the adjusting plate and the pressure plate to move towards the lower mold assembly, and the pressure plate abuts against the outer panel of the door frame to fix the outer panel of the door frame in the vertical direction; The upper mold assembly is provided with a first elastic element. One end of the first elastic element is connected to the fixed plate, and the other end passes through the through hole on the adjusting plate and is connected to the pressure plate. A gap is left between the through hole and the first elastic element to allow relative movement between the adjusting plate and the first elastic element. The upper mold assembly is also provided with a second elastic element, one end of which is connected to the fixed plate and the other end is connected to the adjusting plate.

2. The stamping device for the outer panel of a door frame as described in claim 1, characterized in that, The lower mold assembly is also provided with a support block, which is located below the area to be formed of the outer panel of the door frame, and is used to provide support for the area to be formed of the outer panel of the door frame during the forming process.

3. The stamping device for the outer panel of a door frame as described in claim 2, characterized in that, The support block is provided with a support groove and a through guide groove, and the profile of the support groove matches the back contour of the formed boss. The inlet end of the guide groove is located directly below the punching part, and is used to receive the waste generated by punching and discharge it.

4. The stamping device for the outer panel of a door frame as described in claim 1, characterized in that, The lower end face of the pressure plate is provided with an abutment portion, which abuts against the outer panel of the door frame.

5. The stamping device for the outer panel of a door frame as described in claim 1, characterized in that, The lower mold assembly is also provided with a support base, and the outer panel of the door frame is placed on the support base.

6. The stamping device for the outer panel of a door frame as described in claim 5, characterized in that, The lower mold assembly is also provided with: The first positioning block is fixedly mounted on the support base and abuts against one side of the outer panel of the door frame in the horizontal direction; The second positioning block is disposed opposite to the first positioning block and can move horizontally to abut against the other side of the outer panel of the door frame.

7. The stamping device for a door frame outer panel as described in claim 6, characterized in that, The lower mold assembly is also provided with a driving component, and the second positioning block is connected to the output end of the driving component. The driving component is used to drive the second positioning block to move closer to or away from the outer panel of the door frame.

8. The stamping device for the outer panel of a door frame as described in claim 1, characterized in that, The lower mold assembly is also provided with a contour block, which has a contour part that matches the bottom contour of the outer panel of the door frame, and is used to support and assist in positioning the outer panel of the door frame.

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