An automobile covering piece stamping die, forming system and automobile covering piece

Abstract

The application provides an automobile covering stamping die, a forming system and an automobile covering, relates to the field of forming systems, and aims to solve the problem of low production line efficiency caused by liner wear or replacement specification in the prior art. The application achieves the separation of the liner plate and the die body by arranging a quick replacement mechanism. Two groups of sliding bases are synchronously driven in the first direction by a synchronous driving mechanism. The tapered part automatically pushes the liner plate in the second direction for centering and positioning during the process of inserting the limiting groove by using the tapered surface. The vertical compression of the lower part of the liner plate by the lower pressing block forms the synergistic effect of horizontal constraint and vertical constraint, realizes the quick installation, accurate positioning and reliable fixation of the liner plate, and when it is necessary to replace the liner plate of different specifications, the whole die does not need to be disassembled, and only the sliding base needs to be controlled to exit and release the lower pressing block by the synchronous driving mechanism, so that the old liner plate can be quickly taken out and the new liner plate can be installed, thereby saving downtime compared with the overall die replacement mode.

Description

Technical Field

[0001] This invention relates to the field of forming systems, specifically to a stamping die for automotive body panels, a forming system, and an automotive body panel. Background Technology

[0002] Stamping dies are the core tools for stamping automotive body panels. When different specifications or models of automotive body panels need to be stamped, if the inner liner is integrally formed with the die body, and the inner liner is worn or needs to be replaced, the inner liner cannot be replaced separately. The entire die must be replaced, resulting in the discard of a large number of auxiliary structures, serious material waste, and extremely high replacement costs.

[0003] For stamping dies with detachable inner linings, in the production scenario of multiple varieties and small batches of automotive body panels, frequent replacement of the entire inner lining requires positioning and fixing. The positioning calibration accuracy is low and the efficiency is low, resulting in long time consumption and long downtime each time. This leads to a significant decrease in production line utilization, reduces production efficiency, and fails to meet the needs of flexible production. Summary of the Invention

[0004] In view of this, the present invention provides a stamping die for automotive body panels, a forming system, and an automotive body panel, which solves the problems of long downtime and low production efficiency caused by wear of the inner lining or replacement of specifications in the prior art.

[0005] The first objective of this invention is to provide a stamping die for automotive body panels, which adopts the following solution: The system includes a pair of mating mold bodies, each with a support plate on its opposite side. The support plates are movably connected to an inner liner plate via a quick-change mechanism, which includes: Two sets of sliding bases move closer or further apart in a first direction via a synchronous drive mechanism. The sliding bases are provided with tapered parts. During the synchronous approach, the tapered parts abut against and clamp the limiting groove on the side of the inner liner plate. The pressure block is set on the sliding base. The pressure block and the support plate cooperate to form an openable clamping part to clamp or release the corresponding inner lining plate. The mounting groove is located between two sets of sliding bases, with one end of the mounting groove open to accommodate the mounting limit block at the bottom of the inner lining plate.

[0006] Furthermore, the synchronous drive mechanism includes a limiting gear rotatably mounted on the support plate, with limiting moving blocks connected to both sides of the limiting gear via limiting racks, and the bottom of the sliding base passing through a pre-set sliding groove on the support plate and connected to the limiting moving block, the sliding groove being distributed along the first direction.

[0007] Furthermore, each set of sliding bases includes at least two sliding bases, which are spaced apart along a second direction perpendicular to the first direction and are connected to a limiting moving block. The two ends of the limiting moving block are respectively slidably engaged with the pre-set strip grooves on the support plate. Each sliding base has a tapered part at one end facing the inner liner plate, and the limiting grooves on the side of the inner liner plate are distributed in a one-to-one correspondence with the tapered parts.

[0008] Furthermore, the tapered part is a tapered, gradually tapered structure. During the insertion of the tapered part into the limiting groove along the first direction, the tapered part pushes the inner liner plate to be positioned and centered in the second direction through the tapered surface.

[0009] Furthermore, the pressing block is mounted on the top surface of the sliding base via a rotating support to form a lever structure. One end of the pressing block protrudes beyond the top surface of the sliding base to form a clamping part, and the other end abuts against a telescopic rod that drives the clamping part to open and close.

[0010] Furthermore, the limiting groove is provided on the inner substrate of the inner liner plate, and the position of the lower pressing block abutting the inner substrate plate is on the line connecting the two limiting grooves, so that the horizontal constraint of the tapered part on the inner substrate plate and the vertical pressing constraint of the lower pressing block on the inner substrate plate form a synergy in terms of force.

[0011] Furthermore, the pair of mold bodies are an upper mold and a lower mold, both of which are composed of an mounting plate, a support plate and a bracing plate. The support plate is fixed to the mounting plate, and the side of the support plate and the mounting plate are connected by the bracing plate.

[0012] Furthermore, a first-level guide structure is provided between the upper mold and the lower mold, which includes a positioning rod and a positioning hole that are inserted into each other. The positioning rod is installed at the corner position of the support plate of the upper mold through an upper positioning block, and the positioning hole is distributed on the lower positioning block installed at the corner position of the support plate of the lower mold. The upper mold is connected to the upper inner liner plate, and the lower mold is connected to the lower inner liner plate. A second-level guide structure is provided between the upper inner liner plate and the lower inner liner plate. The second-level guide structure includes positioning posts distributed at the corner position of the upper inner liner plate and positioning holes distributed at the corner position of the lower inner liner plate. The positioning posts and positioning holes are inserted and matched to realize the alignment of the upper inner liner plate and the lower inner liner plate.

[0013] A second objective of the present invention is to provide a forming system comprising an automotive body panel stamping die as described in the first objective, and further comprising a stamping drive device and a support plate arranged vertically at intervals, wherein the stamping drive device is connected to the upper die body and the support plate is connected to the lower die body.

[0014] A third object of the present invention is to provide an automotive body panel that is processed by a molding system as described in the second object.

[0015] Compared with the prior art, the advantages and positive effects of this invention are: To address the issue of low production line efficiency caused by liner wear or specification changes in existing technologies, a quick-change mechanism is implemented. This mechanism enables the separation of the liner plate from the mold body. Two sets of sliding bases move synchronously and symmetrically in the first direction via a synchronous drive mechanism. During insertion into the limiting groove, the tapered part automatically pushes the liner plate for centering and positioning in the second direction using its gradually tapered surface. This, combined with the vertical pressing of the bottom of the liner plate by the lower pressure block, creates a synergistic effect of horizontal and vertical constraints, achieving rapid installation, precise positioning, and reliable fixation of the liner plate. When it is necessary to change to a different specification of liner plate, there is no need to disassemble the entire mold. Simply control the sliding base to exit and release the lower pressure block via the synchronous drive mechanism to quickly remove the old liner plate and install the new one. Compared to the overall mold change method, this saves downtime and improves production efficiency in multi-variety, small-batch production scenarios. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of a stamping die for an automotive body panel in one or more embodiments of the present invention; Figure 2 This is a schematic diagram showing the opening of the upper and lower molds in one or more embodiments of the present invention; Figure 3 This is a schematic diagram of the lower mold structure in one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the support plate being fixed to the mounting plate in one or more embodiments of the present invention; Figure 5 This is a schematic diagram of the inner lining plate in one or more embodiments of the present invention; Figure 6 This is a schematic diagram of a synchronous drive mechanism in one or more embodiments of the present invention; Figure 7 This is a schematic diagram of the sliding base connecting to the synchronous drive mechanism in one or more embodiments of the present invention; Figure 8 This is a schematic diagram of a sliding base in one or more embodiments of the present invention.

[0018] In the diagram, 1. Upper mold; 2. Upper positioning block; 3. Lower positioning block; 4. Lower mold; 5. Positioning rod; 6. Upper inner liner plate; 7. Lower inner liner plate; 8. Positioning insertion hole; 9. Limiting gear; 10. Limiting rack; 11. Limiting moving block; 12. Connecting slider; 13. First telescopic rod; 14. Connecting slide rod; 15. Sliding base; 16. Rotating support; 17. Lower pressure block; 18. Second telescopic rod; 19. Return spring; 20. Sliding groove; 21. Positioning column; 22. Mounting limit block; 23. Stamping mounting plate; 24. Support plate; 25. Diagonal brace plate; 26. Inner liner plate; 27. Inner liner block. Detailed Implementation

[0019] Example 1 In a typical embodiment of the present invention, such as Figure 1 - Figure 8 As shown, a stamping die for automotive body panels is presented.

[0020] In existing automotive body panel stamping dies, the inner liner is fixedly connected to the die body and integrally formed. When the inner liner wears or needs to be changed in size, it is impossible to replace the inner liner plate separately; the entire die must be replaced, resulting in serious material waste, extremely high replacement costs, and long downtime and low production efficiency due to frequent overall die replacements in multi-variety, small-batch production scenarios. This embodiment provides an automotive body panel stamping die suitable for multi-variety, small-batch stamping production scenarios of automotive body panels. By setting a quick-change mechanism between the die body and the inner liner plate, the inner liner plate can be quickly installed, accurately positioned, and reliably fixed. The inner liner plate can be switched without replacing the entire die, thereby solving the problem of low efficiency in overall die replacement in the prior art.

[0021] like Figures 1-8 As shown, the automotive body panel stamping die of this embodiment includes a pair of mating die bodies, each with a support plate 24 on its opposite side. The support plate 24 is movably connected to an inner liner plate via a quick-change mechanism. By introducing a detachable quick-change mechanism between the die body and the inner liner plate, the originally integral die structure is decoupled into two parts: a separable die body and a replaceable inner liner plate. Figure 1 As shown, the main body of the mold serves as the load-bearing foundation, and its structure remains unchanged during the stamping of different specifications of cover parts. Only the inner liner plate that is in direct contact with the shape of the cover part needs to be replaced. Thus, while ensuring stamping accuracy, the mold changing operation is simplified from a complete replacement to a partial replacement, solving the problems of material waste and long downtime caused by a complete mold change.

[0022] The quick-change mechanism consists of three core components, which respectively provide centering constraint, vertical constraint and installation guidance functions for the inner lining plate.

[0023] like Figure 2 , Figure 3 and Figure 4 As shown, the first part consists of two sets of sliding bases 15, which move closer or further apart synchronously in a first direction via a synchronous drive mechanism. Each sliding base 15 has a tapered portion; during synchronous approach, the tapered portion abuts against and clamps the limiting groove on the side of the inner lining plate, thus achieving centering constraint on the inner lining plate.

[0024] like Figure 7 and Figure 8 As shown, the second part is the lower pressure block 17, which is disposed on the sliding base 15. The lower pressure block 17 and the support plate 24 cooperate to form an openable clamping part, which clamps or releases the corresponding inner lining plate to achieve vertical constraint on the inner lining plate.

[0025] like Figure 3 As shown, the third part is the installation slide, which is located between the two sets of sliding bases 15. One end of the installation slide is open to accommodate the installation limit block 22 at the bottom of the inner lining plate, thereby guiding the installation of the inner lining plate.

[0026] like Figure 4 and Figure 5 As shown, when the inner lining plate needs to be installed, the installation limiting block 22 at the bottom of the inner lining plate is first inserted into the installation groove. The open end and the internal space of the installation groove provide initial guidance and support for the installation limiting block 22, so that the inner lining plate corresponding to the lower mold body naturally falls onto the support plate 24 under the action of gravity, and the inner lining plate corresponding to the upper mold body is constrained in position by the installation groove and will not fall off.

[0027] At this point, the inner liner is in a coarse positioning state, and it may deviate in both the first and second directions. Then, the synchronous drive mechanism is activated, driving the two sets of sliding bases 15 to synchronously approach each other along the first direction. The conical portion on the sliding base 15 moves with the sliding base 15, gradually inserting into the limiting groove on the side of the inner liner along the first direction. The conical portion has a gradient structure, with its conical surface forming an angle with the first direction. As the conical portion inserts into the limiting groove, the conical surface contacts the inner wall of the limiting groove, and the inclined component of the conical surface pushes the inner liner to move in the second direction until the inner liner is aligned in the second direction and the conical portion is fully inserted into the limiting groove. At this point, the conical portion forms a bidirectional constraint on the inner liner in the horizontal direction, preventing displacement of the inner liner in the second direction. It also utilizes the two sets of sliding bases 15 on both sides to form a clamping effect, preventing displacement of the inner liner in the first direction.

[0028] Simultaneously, the lower pressure block 17 rotates around the rotating axis under the drive of the telescopic rod. One end of the lower pressure block 17 presses downward against the inner lining plate 26 at the bottom of the inner lining plate, forming a vertical clamping force to prevent the inner lining plate from shifting vertically. The horizontal constraint of the tapered part on the inner lining plate and the vertical clamping constraint of the lower pressure block 17 on the inner lining plate work together to firmly fix the inner lining plate to the mold body. When disassembling the inner lining plate, the operation process is reversed. First, the lower pressure block 17 is driven to release the clamping force on the inner lining plate 26, and then the two sets of sliding bases 15 are driven away. The tapered part exits the limiting groove, releasing the horizontal constraint on the inner lining plate, and the inner lining plate can then be removed from the mounting groove in the first direction.

[0029] Through the coordinated operation of the three components described above, the quick-change mechanism enables rapid installation, precise positioning, and reliable fixation of the inner liner plate. Compared to the traditional method of replacing the entire mold, which requires complex operations such as disassembling the entire mold, re-hoisting, tightening bolts, and alignment adjustments, the quick-change mechanism in this embodiment only requires three simple steps: insertion, driving the sliding base to approach, and driving the lower pressure block to press down. The entire process can be completed within minutes, reducing downtime from several hours to just minutes, thus improving production efficiency. Furthermore, the mold body, serving as the load-bearing foundation, is reusable; only the inner liner plate needs to be replaced according to different specifications of the cover parts, avoiding material waste caused by replacing the entire mold and reducing replacement costs.

[0030] like Figure 6 and Figure 7 The synchronous drive mechanism includes a limiting gear 9 rotatably mounted on the support plate 24. Limiting gear 9 has limiting moving blocks 11 connected to both sides via limiting racks 10. The limiting gear 9 is rotatably connected to the bottom inner wall of the support plate 24 via a rotating shaft, with its axis perpendicular to the first direction. Limiting racks 10 are meshed on both sides of the limiting gear 9, and the two limiting racks 10 are distributed along the first direction on both sides of the limiting gear 9. Limiting moving blocks 11 are fixedly connected to the bottom of each of the two limiting racks 10. The bottom of the limiting moving blocks 11 is slidably connected to the top of the stamping mounting plate 23, and the limiting moving blocks 11 can slide along the first direction on the top of the stamping mounting plate 23. The bottom of the sliding base 15 is fixedly connected to the limiting moving blocks 11 after passing through a pre-set sliding groove 20 on the support plate 24 via a connecting slide rod 14. The sliding groove 20 is distributed along the first direction. The movable end of the first telescopic rod 13 is fixedly connected to one side of one of the limiting moving blocks 11, and the first telescopic rod 13 drives the limiting moving block 11 to move along the first direction.

[0031] When the synchronous drive mechanism is working, the movable end of the first telescopic rod 13 extends, pushing the connected limiting moving block 11 to move along the first direction. The limiting moving block 11 drives the limiting rack 10 fixedly connected to its top to move linearly along the first direction. The limiting rack 10 meshes with the limiting gear 9, and the linear movement of the limiting rack 10 drives the limiting gear 9 to rotate around its axis. The rotation of the limiting gear 9 drives the limiting rack 10 meshing on its other side to move linearly in the opposite direction to the first limiting rack 10. This limiting rack 10 drives the limiting moving block 11 fixedly connected to its bottom to move in the opposite direction. The two limiting moving blocks 11 drive the two sets of sliding bases 15 to move synchronously towards each other along the first direction through the connecting slide rod 14, and the two sets of sliding bases 15 move closer to each other synchronously. When the movable end of the first telescopic rod 13 retracts, the two limiting racks 10 move in opposite directions through the meshing transmission of the limiting gear 9, driving the two sets of sliding bases 15 to move away synchronously. Through the meshing transmission between the limiting gear 9 and the limiting racks 10 on both sides, the unidirectional drive of the first telescopic rod 13 to the limiting rack 10 on one side is converted into the relative movement of the limiting racks 10 on both sides, thereby realizing the synchronous and symmetrical movement of the two sets of sliding bases 15. This ensures the synchronicity and symmetry of the movement of the two sets of sliding bases 15, allowing the conical part to be synchronously and symmetrically inserted into or withdrawn from the limiting grooves on both sides of the inner liner plate, ensuring that the inner liner plate is subjected to uniform force and has high alignment accuracy during the alignment process.

[0032] like Figure 6 As shown, to improve the stability of the movement of the limiting moving block 11, a connecting slider 12 is fixedly connected to one side of the limiting moving block 11, and one end of the connecting slider 12 is slidably connected to the inside of the strip groove opened in the support plate 24. The strip groove is distributed along the first direction, and the connecting slider 12 slides in the strip groove, providing lateral guidance and limiting for the linear movement of the limiting moving block 11. When the limiting moving block 11 moves along the first direction, its bottom slides on the top of the stamping mounting plate 23, while the connecting slider 12 on its side slides in the strip groove of the support plate 24, forming a double limiting of bottom sliding and side sliding, ensuring the stability and straightness of the movement of the limiting moving block 11, avoiding lateral deviation or jamming of the limiting moving block 11 during movement, and thus ensuring the stability and reliability of the entire quick change mechanism during operation.

[0033] like Figure 3 and Figure 7As shown, each set of sliding bases 15 includes at least two sliding bases 15, which are spaced apart along a second direction perpendicular to the first direction and are connected to the limiting moving block 11. Specifically, each set of sliding bases 15 includes two sliding bases 15, which are spaced apart on both sides of the support plate 24 along the second direction. The bottom of each sliding base 15 is fixedly connected to the top of the limiting moving block 11 after passing through a pre-set sliding groove 20 on the support plate 24 via a connecting slide rod 14. The two sliding bases 15 in the same set are connected to the same limiting moving block 11. The two ends of the limiting moving block 11 slide in cooperation with the pre-set strip grooves on the support plate 24. The strip grooves are distributed along the first direction to provide guidance for the limiting moving block 11 and to provide reaction force support for the clamping action between the pressing block 17 and the support plate 24.

[0034] Each sliding base 15 has a tapered portion at one end facing the inner liner plate, and the limiting grooves on the side of the inner liner plate are distributed in a one-to-one correspondence with the tapered portion. The inner lining plate 26 of the inner liner plate has a set of limiting grooves at each end, and each set of limiting grooves includes two limiting grooves. The two limiting grooves are distributed at intervals along the second direction and correspond to the positions of the two tapered portions on the same set of sliding bases 15.

[0035] Each set of sliding bases 15 includes two sliding bases 15, forming two support points in the second direction. The two conical portions simultaneously insert into the two limiting grooves on the same side of the inner liner, creating a two-point constraint on the inner liner. The two sets of sliding bases 15 form a total of four support points, located near the four corners of the inner liner. This four-point constraint ensures that the inner liner is subjected to a uniformly distributed centering constraint force in the second direction, improving the accuracy and stability of centering and positioning. Compared to single-point or two-point constraints, four-point constraints can withstand greater stamping force, preventing deformation or displacement of the inner liner during stamping due to uneven force. Simultaneously, the two sliding bases 15 are connected to the same limiting moving block 11, ensuring the synchronicity of the movement of the two sliding bases 15 in the same set. The two conical portions insert or retract from the limiting grooves synchronously, avoiding the problem of uneven force on the inner liner caused by one side inserting first.

[0036] like Figure 5 and Figure 8As shown, the conical part has a tapered, gradually tapered structure. During insertion into the limiting groove along the first direction, the tapered part gradually pushes the inner liner plate to position and center in the second direction. Similarly, the limiting groove matching the conical part is also a conical groove. The conical surface of the conical part forms an angle with the first direction. This angle is determined based on the weight of the inner liner plate and the size of the limiting groove, typically between 5 and 15 degrees. When the conical part is inserted into the limiting groove along the first direction, the conical surface first contacts the inner wall of the limiting groove. The normal force at the contact point can be decomposed into a component force along the first direction and a component force along the second direction. The component force along the first direction hinders further insertion of the conical part, while the component force along the second direction pushes the inner liner plate to move in the second direction. As the conical part continues to be inserted, the contact area between the conical surface and the inner wall of the limiting groove gradually increases, and the component force along the second direction gradually increases, pushing the inner liner plate to move continuously in the second direction until the inner liner plate is centered in the second direction, and the conical part is fully inserted into the limiting groove. At this time, the conical surface is in close contact with the inner wall of the limiting groove, and the conical part forms a two-way constraint on the inner liner plate, preventing the inner liner plate from displacing in the second direction.

[0037] The tapered section's gradual transition structure increases the centering force applied to the inner liner plate during insertion, preventing damage to the inner liner plate or the limiting groove from sudden impacts. Simultaneously, the included angle design of the tapered surface provides a self-locking effect after insertion. When the inner liner plate is subjected to an external force along the second direction during stamping, this force acts on the tapered surface and can be decomposed into a tangential force along the tapered surface and a normal force perpendicular to the tapered surface. Due to the small included angle of the tapered surface, the tangential force is less than the product of the normal force and the coefficient of friction of the tapered surface, preventing the tapered section from slipping out of the limiting groove, thus achieving self-locking and ensuring the positional stability of the inner liner plate during stamping.

[0038] like Figure 7 and Figure 8 The lower pressure block 17 is mounted on the top surface of the sliding base 15 via a rotating support 16, forming a lever-type structure. The rotating support 16 is fixedly connected to the top of the sliding base 15, and a rotating shaft is provided on the rotating support 16. The lower pressure block 17 is rotatably connected to the rotating support 16 via the rotating shaft. One end of the lower pressure block 17 protrudes beyond the top surface of the sliding base 15 to form a clamping part, and the other end abuts against a telescopic rod that drives the clamping part to open and close.

[0039] Specifically, the lower pressure block 17 is an irregularly shaped lever structure, with its rotation axis located inwardly at the center of the lower pressure block 17, dividing the lower pressure block 17 into a long end and a short end. The long end of the lower pressure block 17 protrudes beyond the top surface of the sliding base 15, forming a clamping part for abutting against the inner lining plate 26 at the bottom of the inner lining plate. The short end of the lower pressure block 17 is located inside the top surface of the sliding base 15, and the second telescopic rod 18 is fixedly connected inside the sliding base 15. The movable end of the second telescopic rod 18 passes through the sliding base 15 and is movably connected to the bottom of the short end of the lower pressure block 17.

[0040] like Figure 8 As shown, a return spring 19 is fixedly connected between the sliding base 15 and the lower pressure block 17. One end of the return spring 19 is fixed to the sliding base 15, and the other end is fixed to the top of the long end of the lower pressure block 17. The return spring 19 is in a compressed state and applies an upward elastic force to the long end of the lower pressure block 17.

[0041] The lever structure of the lower pressure block 17 utilizes the torque amplification principle to reliably press the inner lining plate.

[0042] like Figure 8 As described above, when it is necessary to press the inner lining plate, the movable end of the second telescopic rod 18 extends and pushes the short end of the lower pressure block 17 upward. The lower pressure block 17 rotates around the rotation axis, and the long end of the lower pressure block 17 moves downward to press the inner lining plate 26. Since the lever arm of the long end of the lower pressure block 17 is greater than that of the short end, according to the lever principle, the smaller driving force applied by the second telescopic rod 18 at the short end is converted into a larger pressing force at the long end, realizing force amplification and ensuring reliable pressing of the inner lining plate.

[0043] When the inner liner needs to be loosened, the movable end of the second telescopic rod 18 retracts, and the elastic force of the return spring 19 pushes the long end of the lower pressure block 17 upward. The lower pressure block 17 rotates in the opposite direction around the rotation axis, and the long end of the lower pressure block 17 separates from the inner liner 26, releasing the pressure on the inner liner. The setting of the return spring 19 ensures that the lower pressure block 17 can automatically return to its original position after the second telescopic rod 18 retracts, eliminating the need for an additional reset mechanism and simplifying the structure.

[0044] like Figure 3 As shown, the lower pressure block 17 and the support plate 24 cooperate to form an openable and closable clamping part. When the long end of the lower pressure block 17 presses down on the inner lining plate 26, the inner lining plate 26 is clamped between the long end of the lower pressure block 17 and the support plate 24, forming a clamping state. The support plate 24 provides support for the inner lining plate, and the lower pressure block 17 applies a downward pressing force to the inner lining plate, and the two cooperate to form a vertical clamping of the inner lining plate. When the long end of the lower pressure block 17 moves upward, the inner lining plate 26 separates from the lower pressure block 17, the clamping part opens, and the inner lining plate can move freely. The lower pressure block 17 is driven to rotate around the rotation axis by the second telescopic rod 18 to realize the opening and closing of the clamping part and control the clamping or releasing of the inner lining plate.

[0045] like Figure 5As shown, the limiting groove is disposed on the inner substrate plate 26 of the inner liner plate. The position of the lower pressing block 17 abutting against the inner substrate plate 26 is located on the line connecting the two limiting grooves, so that the horizontal constraint of the tapered part on the inner substrate plate 26 and the vertical pressing constraint of the lower pressing block 17 on the inner substrate plate 26 form a synergistic force. Each end of the inner substrate plate 26 has a set of limiting grooves, each set of limiting grooves including two limiting grooves, which are distributed at intervals along the second direction. The position of the lower pressing block 17 abutting against the inner substrate plate 26 is located on the line connecting the two limiting grooves at the two ends of the inner substrate plate 26, that is, the pressing point of the lower pressing block 17 coincides with or nearly coincides with the center line connecting the two limiting grooves.

[0046] The horizontal constraint force of the tapered portion on the inner substrate 26 and the vertical clamping force of the lower pressing block 17 on the inner substrate 26 work synergistically. After the tapered portion is inserted into the limiting groove, it forms a bidirectional constraint force on the inner substrate 26 along the second direction. This constraint force acts at the position of the limiting groove, that is, at both ends of the inner substrate 26. The clamping force of the lower pressing block 17 on the inner substrate 26 acts on the line connecting the limiting grooves at both ends of the inner substrate 26. The line of action of the clamping force and the horizontal constraint force forms a stable constraint system in space. When the inner substrate is subjected to external force during the stamping process, the horizontal constraint force prevents the inner substrate from displacing in the horizontal direction, and the vertical clamping force prevents the inner substrate from displacing in the vertical direction. The two work together to keep the inner substrate stable in three-dimensional space.

[0047] If only the horizontal constraint of the tapered section is relied upon, the inner liner may experience slight vertical displacement, leading to a decrease in stamping accuracy. If only the vertical clamping of the lower pressure block 17 is relied upon, the inner liner may shift horizontally, also affecting stamping accuracy. By combining horizontal constraint and vertical clamping, a stable three-dimensional constraint system is formed, preventing displacement of the inner liner in any direction and ensuring positional accuracy during the stamping process.

[0048] Meanwhile, due to the reasonable distribution of the application points of the horizontal constraint force and the vertical clamping force, the inner liner plate is subjected to uniform stress, avoiding deformation or damage caused by local stress concentration. Furthermore, this synergistic constraint design has anti-vibration advantages during the stamping process. Vibrations generated during stamping may cause relative movement between the inner liner plate and the die body; the synergy of horizontal constraint and vertical clamping can absorb vibration energy, reduce the vibration amplitude of the inner liner plate, and improve the stability of the stamping process.

[0049] like Figure 1 , Figure 2 and Figure 4To facilitate a detailed explanation of the structure, the two main mold bodies are an upper mold 1 and a lower mold 4, both composed of a stamping mounting plate 23, a support plate 24, and diagonal bracing plates 25. The upper mold 1 and the lower mold 4 are symmetrical in structure; the lower mold 4 will be used as an example. The stamping mounting plate 23 of the lower mold 4 is a rectangular plate structure, with the support plate 24 fixedly connected to the top of the stamping mounting plate 23. The support plate 24 is U-shaped, with the U-shaped opening facing downwards. The bottom of the U-shape is fixedly connected to the stamping mounting plate 23, and the two arms of the U-shape extend upwards. The support plate 24 and the stamping mounting plate 23 are connected by multiple diagonal bracing plates 25. One end of each diagonal bracing plate 25 is fixed to the stamping mounting plate 23, and the other end is fixed to the side of the support plate 24. The diagonal bracing plates 25, the stamping mounting plate 23, and the support plate 24 form a triangular support structure.

[0050] The U-shaped structure of the support plate 24 provides installation space for the quick-change mechanism. Two sets of sliding grooves 20 are formed at the bottom of the U-shape of the support plate 24, distributed along a first direction. A connecting rod 14 passes through the sliding grooves 20 to connect the sliding base 15 and the limiting moving block 11. An installation groove is formed between the two sets of sliding grooves 20 at the bottom of the U-shape of the support plate 24. This installation groove is distributed along the first direction, with one end open and the other closed, to accommodate the installation limiting block 22 at the bottom of the inner lining plate. Strip-shaped grooves are formed on both inner walls of the support plate 24, distributed along the first direction. A connecting slider 12 is slidably connected inside the strip-shaped grooves, providing lateral guidance for the linear movement of the limiting moving block 11.

[0051] The triangular support structure of the inclined brace 25 improves the overall rigidity of the mold body. During the stamping process, the stamping force is transmitted to the support plate 24 through the inner liner plate, and the support plate 24 bears the downward pressure. If the support plate 24 and the stamping mounting plate 23 are only connected at the bottom, the support plate 24 may bend and deform under pressure, affecting the stamping accuracy. By setting the inclined brace 25 between the side of the support plate 24 and the stamping mounting plate 23, a triangular support structure is formed, which decomposes the pressure borne by the support plate 24 into the pressure along the inclined brace 25 and the pressure along the stamping mounting plate 23. The inclined brace 25 and the stamping mounting plate 23 share the stamping force, reducing the bending deformation of the support plate 24. The triangular structure has stability and can withstand large external forces without deformation, ensuring the rigidity and stability of the mold body during the stamping process.

[0052] The symmetrical structure of the upper die 1 and the lower die 4 ensures uniform stress distribution during the stamping process. Both the upper die 1 and the lower die 4 consist of a stamping mounting plate 23, a support plate 24, and a diagonal brace 25, with identical structures and comparable rigidity. They can withstand the same stamping force without relative deformation, ensuring stamping accuracy. Furthermore, both the upper die 1 and the lower die 4 are equipped with quick-change mechanisms, allowing for rapid replacement of the upper inner liner plate 6 and the lower inner liner plate 7, thus improving the versatility and flexibility of the dies.

[0053] like Figure 1 and Figure 2 A first-stage guide structure is provided between the upper mold 1 and the lower mold 4. The first-stage guide structure includes interlocking positioning rods 5 and positioning holes. The positioning rods 5 are installed at the corner positions of the support plate 24 of the upper mold 1 via upper positioning blocks 2. The positioning holes are positioning holes 8, distributed on the lower positioning blocks 3 installed at the corner positions of the support plate 24 of the lower mold 4. Four upper positioning blocks 2 are fixedly connected to the bottom of the upper mold 1, and the four upper positioning blocks 2 are distributed at the four corner positions of the support plate 24. The bottom of each upper positioning block 2 is fixedly connected to a positioning rod 5, which is a cylindrical structure extending vertically.

[0054] Four lower positioning blocks 3 are fixedly connected to the top of the lower mold 4. The four lower positioning blocks 3 are distributed at the four corners of the support plate 24, corresponding to the positions of the four upper positioning blocks 2 of the upper mold 1. Each lower positioning block 3 has a positioning insertion hole 8 at its top. The diameter of the positioning insertion hole 8 is slightly larger than the diameter of the positioning insertion rod 5, forming a clearance fit.

[0055] As the upper mold 1 moves downward, the bottom ends of the four positioning rods 5 simultaneously approach the four positioning holes 8. Since the diameter of the positioning holes 8 is slightly larger than the diameter of the positioning rods 5, the positioning rods 5 can be smoothly inserted into the positioning holes 8. During insertion, the positioning rods 5 contact the inner wall of the positioning holes 8, and the positioning holes 8 form a radial constraint on the positioning rods 5, guiding them to insert vertically and simultaneously correcting the horizontal deviation between the upper mold 1 and the lower mold 4. After the four positioning rods 5 are fully inserted into the four positioning holes 8, the cooperation between the positioning rods 5 and the positioning holes 8 aligns the upper mold 1 and the lower mold 4 horizontally, ensuring their relative positional accuracy. The first-stage guide structure, through the insertion and cooperation of the positioning rods 5 and the positioning holes 8, achieves coarse positioning of the upper mold 1 and the lower mold 4, providing a foundation for the subsequent precise alignment of the upper inner liner plate 6 and the lower inner liner plate 7.

[0056] like Figure 2 and Figure 5 The upper mold 1 is connected to the upper inner liner plate 6, and the lower mold 4 is connected to the lower inner liner plate 7. A second-level guide structure is provided between the upper inner liner plate 6 and the lower inner liner plate 7. The second-level guide structure includes positioning posts 21 distributed at the corners of the upper inner liner plate 6 and positioning holes distributed at the corners of the lower inner liner plate 7. The positioning posts 21 are inserted into the positioning holes to achieve alignment between the upper inner liner plate 6 and the lower inner liner plate 7. Positioning posts 21 are fixedly connected to the four bottom corners of the upper inner liner plate 6. The positioning posts 21 are cylindrical structures that extend downwards in the vertical direction. Positioning holes are opened at the four top corners of the lower inner liner plate 7. The diameter of the positioning holes is slightly larger than the diameter of the positioning posts 21, forming a clearance fit. The positions of the four positioning posts 21 correspond to the positions of the four positioning holes.

[0057] As the upper die 1 moves the upper inner liner 6 downwards, the upper die 1 and lower die 4 have completed rough positioning under the guidance of the first-stage guide structure. As the upper inner liner 6 continues to move downwards, the bottom ends of the four positioning pins 21 simultaneously approach the four positioning holes. During the insertion of the positioning pins 21 into the positioning holes, the positioning holes form a radial constraint on the positioning pins 21, guiding them to insert vertically and simultaneously correcting the horizontal deviation between the upper inner liner 6 and the lower inner liner 7. After the four positioning pins 21 are fully inserted into the four positioning holes, the cooperation between the positioning pins 21 and the positioning holes ensures that the upper inner liner 6 and the lower inner liner 7 are precisely aligned horizontally, guaranteeing their relative positional accuracy. The second-stage guide structure, through the insertion and cooperation of the positioning pins 21 and the positioning holes, achieves precise positioning of the upper inner liner 6 and the lower inner liner 7, ensuring accurate alignment of the upper and lower inner liner plates during the stamping process.

[0058] The first-stage and second-stage guiding structures form a two-stage guiding system, achieving a combination of coarse and fine positioning. The first-stage guiding structure, through the cooperation of the positioning pin 5 and the positioning hole 8, ensures the alignment of the upper mold 1 and the lower mold 4, providing a foundation for the alignment of the upper inner liner plate 6 and the lower inner liner plate 7. The second-stage guiding structure, through the cooperation of the positioning pin 21 and the positioning hole, further ensures the precise alignment of the upper inner liner plate 6 and the lower inner liner plate 7 based on the first-stage guiding structure. The two-stage guiding system progressively improves the alignment accuracy, ultimately ensuring the precise alignment of the upper and lower inner liner plates during the stamping process, thereby guaranteeing the stamping accuracy and quality of the automotive body panels.

[0059] like Figure 5 As shown, both the upper inner liner plate 6 and the lower inner liner plate 7 are composed of an inner liner plate 26 and an inner liner block 27. The inner liner plate 26 is a rectangular plate structure, and the inner liner block 27 is fixedly connected to one side of the inner liner plate 26. The inner liner block 27 is a forming block that matches the shape of the automotive body panel. The surface shape of the inner liner block 27 is complementary to the shape of the automotive body panel and is used to form the automotive body panel during the stamping process. The bottom of the inner liner plate 26 is fixedly connected to an installation limiting block 22, which is a rectangular block structure that extends along the first direction and is used to insert into the installation groove of the mold body. Both ends of the inner liner plate 26 are provided with a set of limiting grooves. Each set of limiting grooves includes two limiting grooves, which are spaced apart along the second direction and are used to cooperate with the tapered part on the sliding base 15.

[0060] The entire inner liner panel can be replaced according to the shape of different automotive body panels. The inner liner panel 26 serves as a load-bearing base, acting as a standard base in the stamping of body panels of different specifications. Different inner liner panels have different inner liner blocks 27 that match the shape of the body panel. The inner liner blocks 27 are fixed to the inner liner panel 26 by bolts or other detachable methods, or they can be integrated into one piece. When a detachable design is adopted, replacing the inner liner block 27 only requires removing the fixing bolts, removing the old inner liner block 27, installing the new inner liner block 27, and then tightening the bolts. Compared to replacing the entire inner liner panel, replacing only the inner liner block 27 further reduces replacement costs.

[0061] When the lower inner liner 7 needs to be replaced, the second telescopic rod 18 is first activated via the external controller, causing its movable end to retract. After the movable end of the second telescopic rod 18 retracts, it no longer pushes the short end of the lower pressure block 17 upwards. The elastic force of the return spring 19 pushes the long end of the lower pressure block 17 upwards, causing the lower pressure block 17 to rotate in the opposite direction around its rotation axis. The long end of the lower pressure block 17 separates from the inner liner 26, releasing the pressure on the inner liner 26. At this time, the clamping part formed by the lower pressure block 17 and the support plate 24 opens, and the inner liner is no longer constrained vertically.

[0062] Subsequently, the first telescopic rod 13 is activated via an external controller, causing its movable end to retract. The retraction of the movable end of the first telescopic rod 13 pulls the connected limiting moving block 11 to move in a first direction away from the inner lining plate. This limiting moving block 11 drives the limiting rack 10, fixedly connected to its top, to move linearly in the first direction away from the inner lining plate. The limiting rack 10 meshes with the limiting gear 9, and the linear movement of the limiting rack 10 drives the limiting gear 9 to rotate around its axis. The rotation of the limiting gear 9 drives the limiting rack 10 meshing on its other side to move linearly towards the inner lining plate, but because the movement directions of the two limiting racks 10 are opposite, the two sets of sliding bases 15 move away synchronously. The connecting slider 12 slides within the strip groove of the support plate 24, and the limiting moving block 11 slides on the top of the stamped mounting plate 23, ensuring the stability of the movement of the limiting moving block 11. The two sets of sliding bases 15 are connected to the limiting moving block 11 via connecting slide rods 14, and move away synchronously with the movement of the limiting moving block 11.

[0063] As the two sets of sliding bases 15 move away from each other, the conical portion on the sliding base 15 gradually exits from the limiting groove of the inner liner plate 26. After the conical portion exits the limiting groove, the horizontal constraint of the conical portion on the inner liner plate is released, and the inner liner plate is no longer constrained in the horizontal direction. At this time, the inner liner plate is held on the mold body only by the cooperation between the mounting limit block 22 and the mounting slide, but the mounting limit block 22 and the mounting slide are in a sliding fit, and the inner liner plate can move along the first direction. The operator can push the lower inner liner plate 7, so that the lower inner liner plate 7 drives the mounting limit block 22 fixedly connected to its bottom to slide out of the mounting slide along the first direction, completing the disassembly of the lower inner liner plate 7.

[0064] When installing the new lower inner liner 7, the operation procedure is reversed. First, align the installation limiting block 22 of the new lower inner liner 7 with the open end of the installation groove, and push the lower inner liner 7 in the first direction so that the installation limiting block 22 is inserted into the installation groove. The installation groove provides a guide for the installation limiting block 22, guiding the installation limiting block 22 into the first direction until the installation limiting block 22 is inserted to the bottom of the installation groove, and the lower inner liner 7 rests on the support plate 24, completing the coarse positioning.

[0065] Subsequently, the first telescopic rod 13 is activated via an external controller, causing its movable end to extend. The extended movable end of the first telescopic rod 13 pushes the connected limiting moving block 11 to move towards the inner liner plate along the first direction. Through the meshing transmission between the limiting gear 9 and the limiting rack 10, the two sets of sliding bases 15 move towards each other synchronously. The tapered portion on the sliding base 15 moves with the sliding base 15, gradually inserting into the limiting groove of the inner liner plate 26 along the first direction. The tapered surface of the tapered portion contacts the inner wall of the limiting groove, and the inclined component of the tapered surface pushes the inner liner plate to move in the second direction until the inner liner plate is centered in the second direction, and the tapered portion is fully inserted into the limiting groove. At this time, the tapered portion forms a bidirectional constraint on the inner liner plate in the horizontal direction, and the inner liner plate is firmly fixed in the horizontal direction.

[0066] Finally, the second telescopic rod 18 is activated by the external controller, causing its movable end to extend. The extended movable end of the second telescopic rod 18 pushes upwards against the short end of the lower pressure block 17, causing the lower pressure block 17 to rotate around its axis. The long end of the lower pressure block 17 moves downwards, pressing against the inner lining plate 26. The clamping portion formed by the lower pressure block 17 and the support plate 24 closes, clamping the inner lining plate 26 between the lower pressure block 17 and the support plate 24, thus firmly fixing the inner lining plate vertically. At this point, the installation of the lower inner lining plate 7 is complete. The inner lining plate is firmly fixed to the mold body by the horizontal constraint of the tapered portion and the vertical pressing of the lower pressure block 17.

[0067] The replacement procedure for the upper inner liner 6 is the same as that for the lower inner liner 7. The structure of the upper mold 1 is symmetrical to that of the lower mold 4, and the upper inner liner 6 is installed on the upper mold 1 through the same quick-change mechanism. When replacing the upper inner liner 6, the lower pressure block 17 is released by activating the second telescopic rod 18, and the first telescopic rod 13 is activated to drive the sliding base 15 away so that the conical part exits the limiting groove. The upper inner liner 6 is then pushed so that the installation limiting block 22 slides out of the installation slide groove, completing the disassembly. When installing the new upper inner liner 6, the installation limiting block 22 is inserted into the installation slide groove, the first telescopic rod 13 is activated to drive the sliding base 15 closer so that the conical part inserts into the limiting groove, and the second telescopic rod 18 is activated to drive the lower pressure block 17 to press the inner liner 26, completing the installation.

[0068] The replacement process described above is simple and quick, requiring no complex tools or operations. The entire process includes six steps: loosening the lower pressure block, moving the sliding base away, removing the old inner liner, inserting the new inner liner, moving the sliding base closer, and tightening the lower pressure block. Each step involves simple electric drive or manual push-pull operation, with short operation time, typically completed within minutes. Compared to traditional whole-mold replacement methods that require disassembling the entire mold, hoisting, bolt tightening, and alignment adjustments, the quick-change mechanism in this embodiment significantly reduces mold replacement time and improves production efficiency.

[0069] Example 2 In another typical embodiment of the present invention, such as Figure 1 - Figure 8 As shown, a forming system is provided that utilizes an automotive body panel stamping die as in Example 1.

[0070] It also includes vertically spaced stamping drive units and support plates. The stamping drive units are connected to the upper die 1 located above, and the support plates are connected to the lower die 4 located below.

[0071] like Figure 1 As shown, the stamping drive device is a hydraulic press or a mechanical press, positioned above the upper die 1. The stamping drive device includes a drive source and a transmission mechanism. The drive source is a hydraulic cylinder or a motor, and the transmission mechanism is a hydraulic system or a mechanical transmission system. The output end of the stamping drive device is fixedly connected to the stamping mounting plate 23 of the upper die 1, driving the upper die 1 to move vertically up and down. The support plate is a rectangular plate structure, positioned below the lower die 4. The support plate is fixed to the ground or frame by support columns, and its top is fixedly connected to the stamping mounting plate 23 of the lower die 4, providing stable support for the lower die 4.

[0072] The overall workflow of the forming system is as follows. First, the operator places the automotive body panel blank to be stamped onto the lower inner liner plate 7. The surface shape of the inner liner block 27 of the lower inner liner plate 7 is complementary to the shape of the automotive body panel, and the blank is placed on the inner liner block 27 in a predetermined position. Subsequently, the operator starts the stamping drive device, which drives the upper die 1 to move downwards in the vertical direction.

[0073] As the upper mold 1 moves downward, the first-stage guide structure begins to function. The four positioning pins 5 at the bottom of the upper mold 1 gradually approach the four positioning holes 8 at the top of the lower mold 4. During the insertion of the positioning pins 5 into the positioning holes 8, the positioning holes 8 provide radial constraints to the positioning pins 5, guiding them to insert vertically and simultaneously correcting the horizontal deviation between the upper mold 1 and the lower mold 4. Once the four positioning pins 5 are fully inserted into the four positioning holes 8, the upper mold 1 and the lower mold 4 achieve rough positioning in the horizontal direction, and their relative positions are initially aligned.

[0074] As the upper mold 1 continues to move downwards, the second-stage guide structure begins to function. The four positioning pins 21 at the bottom of the upper inner liner plate 6 gradually approach the four positioning holes at the top of the lower inner liner plate 7. During the insertion of the positioning pins 21 into the positioning holes, the positioning holes provide radial constraints to the positioning pins 21, guiding them to insert vertically and simultaneously correcting the horizontal deviation between the upper inner liner plate 6 and the lower inner liner plate 7. Once the four positioning pins 21 are fully inserted into the four positioning holes, the upper inner liner plate 6 and the lower inner liner plate 7 are precisely positioned horizontally, and their relative positions are accurately aligned.

[0075] Guided by the first and second guiding structures, the upper mold 1 and lower mold 4, and the upper inner liner plate 6 and lower inner liner plate 7 are aligned. At this time, the inner liner block 27 of the upper inner liner plate 6 and the inner liner block 27 of the lower inner liner plate 7 are precisely aligned, and the gap between them matches the thickness of the automotive body panel blank. The stamping drive device continues to drive the upper mold 1 to move downward, and the inner liner blocks 27 of the upper inner liner plate 6 and the lower inner liner plate 7 apply stamping pressure to the blank. Under the action of stamping pressure, the blank undergoes plastic deformation and gradually forms an automotive body panel that matches the shape of the inner liner block 27.

[0076] During the stamping process, the stamping force is transmitted through the upper inner liner plate 6 and the lower inner liner plate 7 to the upper die 1 and the lower die 4, and then to the stamping drive device and the support plate. The support plate provides stable support for the lower die 4, withstands the downward stamping reaction force, and prevents the lower die 4 from shifting or deforming during the stamping process. The stamping drive device provides a downward driving force to the upper die 1, while simultaneously withstanding the upward stamping reaction force, ensuring the stable movement of the upper die 1 during the stamping process.

[0077] When the upper die 1 reaches its lower stop, the blank is stamped and formed into an automotive body panel. The stamping drive device drives the upper die 1 to move in the opposite direction, returning vertically upwards. During the return stroke, the positioning pin 21 retracts from the positioning hole, the positioning rod 5 retracts from the positioning hole 8, the upper inner liner 6 separates from the lower inner liner 7, and the upper die 1 separates from the lower die 4. The operator removes the formed automotive body panel, completing one stamping cycle.

[0078] The forming system, through the cooperation of a stamping drive unit, upper die 1, lower die 4, and support plate, achieves automated stamping forming of automotive body panels. The first-stage and second-stage guiding structures ensure precise alignment of the upper and lower dies and inner liners during the stamping process, thereby guaranteeing the stamping accuracy and quality of the automotive body panels. The stamping drive unit provides stable and controllable stamping force, while the support plate provides stable support; their combined operation ensures the stability and reliability of the stamping process.

[0079] The forming system in this embodiment, combined with the automotive body panel stamping die from Embodiment 1, enables rapid replacement of the inner liner plate. When stamping automotive body panels of different specifications is required, it is not necessary to replace the entire stamping die set; only the upper inner liner plate 6 and the lower inner liner plate 7 need to be replaced. The operation of replacing the inner liner plate is simple and quick, and can be completed within minutes, significantly reducing downtime compared to the traditional whole-die replacement method. In multi-variety, small-batch production scenarios, the forming system can quickly switch between inner liner plates of different specifications to adapt to the stamping requirements of automotive body panels for different models, thereby improving the flexible production capacity of the production line.

[0080] In actual production, automobile manufacturers typically need to produce body panels for various car models, with differences in shape and size between the panels. Traditional stamping dies employ a one-piece molding design, requiring a dedicated die for each car model. This necessitates companies stocking a large number of dies, occupying significant storage space, and incurring high procurement and maintenance costs. Using the molding system described in this embodiment, companies only need to stock one die body and multiple sets of inner liners of different specifications. When producing body panels for different car models, only the inner liners need to be replaced. The volume and weight of the inner liners are far smaller than the entire die set, resulting in lower storage and transportation costs. Furthermore, the manufacturing cost of the inner liners is also lower than that of the entire die set, reducing the company's die investment costs.

[0081] Furthermore, the forming system of this embodiment also demonstrates the advantage of low maintenance costs when the inner liner plate wears or is damaged. During the stamping process, the inner liner plate is in direct contact with the blank and bears significant friction and impact forces. After long-term use, the surface of the inner liner plate will wear down, affecting stamping accuracy and surface quality. Traditional stamping dies adopt a one-piece molding design, and after the inner liner wears down, the entire die needs to be replaced or the die needs to be repaired, resulting in high replacement costs and long repair cycles. With the forming system of this embodiment, only the inner liner plate needs to be replaced after wear, resulting in low replacement costs and short replacement time, reducing production line downtime and lowering maintenance costs.

[0082] Example 3 In another embodiment of this example, an automotive body panel is provided, which utilizes the molding system as described in Example 2.

[0083] Automotive body panels refer to sheet metal parts that cover the outer surface of a car body, including door panels, hood, fenders, roof, and trunk lid. Automotive body panels not only protect the internal structure of the car body but also directly affect the car's appearance and aerodynamic performance; therefore, high requirements are placed on the dimensional accuracy and surface quality of automotive body panels.

[0084] The automotive body panel in this embodiment is formed by stamping using the forming system of Embodiment 2. The forming system employs the automotive body panel stamping die of Embodiment 1, which achieves rapid installation, precise positioning, and reliable fixing of the inner liner plate through a quick-change mechanism. During the stamping process, the upper inner liner plate 6 and the lower inner liner plate 7 are precisely aligned via a second-stage guide structure, and the gap between them precisely matches the thickness of the automotive body panel blank, ensuring uniform stress and consistent deformation of the blank during stamping. Simultaneously, the inner liner plate is firmly fixed to the die body by the horizontal constraint of the tapered portion and the vertical clamping of the lower pressure block 17, preventing displacement or loosening during stamping and ensuring the stability of the stamping process.

[0085] Due to the precise alignment and reliable fixing of the inner lining panel, the automotive body panel in this embodiment has excellent dimensional accuracy. The dimensions of each part of the automotive body panel deviate little from the design dimensions, meeting the assembly requirements of automobile manufacturing. The fit clearance between the automotive body panel and other parts of the vehicle body is uniform and consistent, preventing misalignment, excessively large or small gaps after assembly, thus ensuring the overall assembly quality of the automobile.

[0086] Meanwhile, the automotive body panel of this embodiment has excellent surface quality. The surface of the inner lining block 27 of the inner lining plate is precision machined, resulting in low surface roughness, which allows its surface quality to be replicated onto the automotive body panel during the stamping process. The surface of the automotive body panel is smooth and flat, without obvious scratches, dents, wrinkles, or other defects, meeting the aesthetic requirements of the vehicle's appearance. The good surface quality of the automotive body panel ensures strong coating adhesion in subsequent painting processes, resulting in a smooth and even coating surface, thus improving the overall appearance quality of the vehicle.

[0087] The automotive body panel in this embodiment is formed by stamping using the molding system of Embodiment Two. This molding system features a quick-change inner liner function, enabling flexible production to meet the diverse needs of automotive body panels. Automotive manufacturers can quickly switch between different specifications of inner liner panels according to their production plans to produce automotive body panels for different car models, improving the flexibility and adaptability of the production line. In a multi-variety, small-batch production mode, the quick mold change function of the molding system significantly shortens mold change time, reduces production line downtime, improves production efficiency, and lowers production costs.

[0088] For example, a car manufacturer needs to produce door outer panels for three car models: A, B, and C. These three door outer panels have different shapes and sizes, requiring different specifications of inner lining panels. Using traditional stamping dies, the company needs to equip each model with a dedicated die. Die A is used to produce the door outer panel for model A, while the entire die needs to be replaced with die B to produce the door outer panel for model B. This die changeover takes several hours, resulting in significant production line downtime. Using the molding system described in this embodiment, the company only needs one die body and three specifications of inner lining panels (A, B, and C). Inner lining panel A is used to produce the door outer panel for model A, and only inner lining panel B needs to be replaced to produce the door outer panel for model B. The inner lining panel replacement takes only a few minutes, minimizing production line downtime and increasing production efficiency.

[0089] Because the inner liner is precisely positioned and reliably fixed through a quick-change mechanism, the positional accuracy of the inner liner is consistent after each installation, ensuring consistent dimensional accuracy of automotive body panels stamped from different batches. Simultaneously, the inner liner will not shift or loosen during the stamping process, ensuring consistent stability in each stamping process, thereby guaranteeing the quality consistency of automotive body panels across different batches. Automotive body panels with good quality consistency have good interchangeability during assembly, reducing assembly difficulties caused by part dimensional deviations and improving assembly efficiency and quality.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stamping die for automotive body panels, characterized in that, The system includes a pair of mating mold bodies, each with a support plate on its opposite side. The support plates are movably connected to an inner liner plate via a quick-change mechanism, which includes: Two sets of sliding bases move closer or further apart in a first direction via a synchronous drive mechanism. The sliding bases are provided with tapered parts. During the synchronous approach, the tapered parts abut against and clamp the limiting groove on the side of the inner liner plate. The pressure block is set on the sliding base. The pressure block and the support plate cooperate to form an openable clamping part to clamp or release the corresponding inner lining plate. The mounting groove is located between two sets of sliding bases, with one end of the mounting groove open to accommodate the mounting limit block at the bottom of the inner lining plate.

2. The automotive body panel stamping die as described in claim 1, characterized in that, The synchronous drive mechanism includes a limiting gear rotatably mounted on the support plate. Limiting moving blocks are connected to both sides of the limiting gear via limiting racks. The bottom of the sliding base passes through a pre-set sliding groove on the support plate and is connected to the limiting moving block. The sliding groove is distributed along the first direction.

3. The automotive body panel stamping die as described in claim 2, characterized in that, Each set of sliding bases includes at least two sliding bases. The two sliding bases are distributed at intervals along a second direction perpendicular to the first direction and are connected to a limiting moving block. The two ends of the limiting moving block are respectively slidably engaged with the pre-set strip grooves on the support plate. Each sliding base has a tapered part at one end facing the inner lining plate. The limiting grooves on the side of the inner lining plate are distributed in a one-to-one correspondence with the tapered parts.

4. The automotive body panel stamping die as described in claim 1, 2, or 3, characterized in that, The tapered part has a tapered, gradually changing structure. During the process of inserting the tapered part into the limiting groove along the first direction, the tapered part pushes the inner liner plate to be positioned and centered in the second direction through the tapered surface.

5. The automotive body panel stamping die as described in claim 1, characterized in that, The pressing block is mounted on the top surface of the sliding base via a rotating support, forming a lever structure. One end of the pressing block protrudes beyond the top surface of the sliding base to form a clamping part, and the other end abuts against a telescopic rod that drives the clamping part to open and close.

6. The automotive body panel stamping die as described in claim 5, characterized in that, The limiting groove is set on the inner substrate of the inner liner plate, and the position of the lower pressing block abutting the inner substrate plate is on the line connecting the two limiting grooves, so that the horizontal constraint of the tapered part on the inner substrate plate and the vertical pressing constraint of the lower pressing block on the inner substrate plate form a synergy in terms of force.

7. The automotive body panel stamping die as described in claim 1, characterized in that, The pair of mold bodies are an upper mold and a lower mold, both of which are composed of an mounting plate, a support plate and a diagonal brace. The support plate is fixed to the mounting plate, and the side of the support plate and the mounting plate are connected by the diagonal brace.

8. The automotive body panel stamping die as described in claim 7, characterized in that, A first-level guide structure is provided between the upper mold and the lower mold, which includes a positioning rod and a positioning hole that are inserted into each other. The positioning rod is installed at the corner position of the support plate of the upper mold through an upper positioning block, and the positioning hole is distributed on the lower positioning block installed at the corner position of the support plate of the lower mold. The upper mold is connected to the upper inner liner plate, and the lower mold is connected to the lower inner liner plate. A second-level guide structure is provided between the upper inner liner plate and the lower inner liner plate. The second-level guide structure includes positioning posts distributed at the corner position of the upper inner liner plate and positioning holes distributed at the corner position of the lower inner liner plate. The positioning posts and positioning holes are inserted and matched to realize the alignment of the upper inner liner plate and the lower inner liner plate.

9. A molding system, characterized in that, The automotive body panel stamping die as described in any one of claims 1-8 further includes a stamping drive device and a support plate that are vertically spaced apart, wherein the stamping drive device is connected to the upper die body and the support plate is connected to the lower die body.

10. A car body panel, characterized in that, It is obtained by processing using the molding system as described in claim 9.

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