Composite overrun stamping die for limiting pressure press

Abstract

The invention discloses a composite overrun stamping die for limiting a pressure press, and belongs to the technical field of design and manufacturing of automobile stamping dies. The composite over-limit stamping die for limiting the pressure press can effectively reduce the pressure required by the press, and can perform up-down flanging during trimming and punching. The composite over-limit stamping die comprises a material pressing module set, a punching module set and a trimming module set which are arranged on an upper die base and a lower die base, and further comprises an upper flanging module set and a lower flanging driving module set, the upper flanging module group and the lower flanging driving module group are arranged on the upper die holder and the lower die holder in a manner that the positions of the upper flanging module group, the lower flanging driving module group and the material pressing module group, the punching module group and the trimming module group are mutually adaptive; after a part blank is stably pressed by the material pressing module set, trimming and punching are conducted on the part blank through the punching module set and the trimming module set, and meanwhile upward flanging and downward flanging are conducted on the corresponding position through the upper flanging module set and the lower flanging driving module set.

Description

Technical Field

[0001] The invention relates to a composite over-limit stamping die, in particular to a composite over-limit stamping die for a limited pressure press, and belongs to the technical field of automobile stamping die design and manufacturing. Background Art

[0002] When designing automotive stamping dies, stamping processes that require both upward and downward flanging are often encountered. The current conventional practice in the industry is to design an upper die flanging insert, a lower die flanging insert, an upper press, and a lower press, a total of four components working together to achieve upper and lower flanging. Depending on the size of the pressing force of the upper press and the lower press, the upper or lower flanging can be achieved first. The existing typical conventional die design structure is as follows: Figure 1 As shown, the working forces for both the upward and downward flanging of this type of mold structure need to be provided by the upper slide of the press.

[0003] A company undertook a project where the fourth process required simultaneous upward and downward flanging, along with punching, side trimming, and side punching. The customer's existing press had a rated pressure of only 400 tonnes, with an 80% pressure safety factor, allowing for an operating pressure of 320 tonnes. The required working force for this product included 125 tonnes for trimming and punching, 155 tonnes for upward flanging, and 100 tonnes for downward flanging, totaling 380 tonnes. This exceeded the press's safe operating pressure, and conventional mold designs were unable to meet the pressure requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a composite over-limit stamping die for a limited pressure press which can effectively reduce the required pressure of the press and perform upper and lower flanging while trimming and punching.

[0005] The technical solution adopted to solve the above technical problems is: a composite over-limit stamping die for a limited pressure press, including a pressing module group, a punching module group and a trimming module group, the pressing module group, the punching module group and the trimming module group are arranged on the upper die base and the lower die base in a position-adaptive manner, and the upper die base and the lower die base are arranged on the press in a position-adaptive manner, and the composite over-limit stamping die also includes an upper flanging module group and a lower flanging drive module group, the upper flanging module group and the lower flanging drive module group are arranged on the upper die base and the lower die base in a position-adaptive manner relative to each other and between the pressing module group, the punching module group and the trimming module group; after the stamped part blank is stabilized by the pressing module group, the punching module group and the trimming module group are used to perform trimming and punching, while the upper flanging module group and the lower flanging drive module group are used to perform upper and lower flanging on the corresponding positions of the part blank.

[0006] Furthermore, the pressing module group includes a profile supporting punch and a pressing plate. The profile supporting punch is arranged on the lower die base, and the pressing plate is arranged on the upper die base in a manner corresponding to the position of the profile supporting punch. The part blank placed on the profile supporting punch is stabilized by the pressing plate under the cooperation of the pressure input by the press on the upper die base.

[0007] The preferred embodiment of the above scheme is that the composite over-limit stamping die also includes an inclined wedge block, the punching module group includes at least a side punching punch, and the trimming module group includes at least a side trimming knife block, and the side punching punch and the side trimming knife block are arranged on the upper die seat in a manner that is adapted to the position of the inclined wedge block; the part blank pressed firmly on the profile support punch drives the inclined wedge block to drive the side punching punch and the side trimming knife block to perform trimming and punching during the downward movement of the upper die seat.

[0008] Furthermore, the upper flanging module group includes at least an upper flanging insert, and the composite over-limit stamping die also includes a pulley and a driving guide plate. The pulley is arranged on the lower die base, and the driving guide plate is arranged on the upper die base and the pulley in a mutually adaptive manner. The upper flanging insert is movably arranged in the profile support punch; the part blank pressed and stabilized on the profile support punch passes through the upper die base running downward, and the corresponding position is flanging upward in the process of the upper flanging insert being driven by the pulley to run upward in cooperation with the driving guide plate.

[0009] The preferred embodiment of the above scheme is that the driving guide plate includes an upper guide plate and a lower guide plate, and the upper guide plate and the lower guide plate are respectively provided with mutually adapted 45° inclined guide surfaces, the upper guide plate is arranged on the upper die base, and the lower guide plate is arranged on the pulley in a manner adapted to the position of the upper guide plate; in the process of the upper guide plate moving downward, the lower guide plate is driven to move horizontally by the cooperation of the 45° inclined guide surface, and the pulley is driven to move inwardly in the horizontal direction, and the inwardly moving pulley drives the upper flanging insert to move upward to perform upward flanging on the corresponding position of the part blank.

[0010] Furthermore, the lower flanging drive module group includes a lower flanging assembly and a lower flanging drive mechanism. The lower flanging drive mechanism is arranged on the upper die base, and the lower flanging assembly is arranged on the upper die base in accordance with the position of the drive guide plate. While the upper die base moves downward to perform upward flanging on the corresponding position of the part blank, the lower flanging drive mechanism drives the lower flanging insert of the lower flanging assembly to move in the horizontal direction to perform downward flanging on the corresponding position of the part blank.

[0011] The preferred embodiment of the above scheme is that the lower flanging drive mechanism includes a control component and multiple sets of driving cylinders whose number is equivalent to the flanging drive requirements of the lower flanging component, and each set of driving cylinders is arranged on the upper die base in accordance with the position of the lower flanging component; during the lower flanging process, each set of driving cylinders outputs driving force under the control of the control component to drive the lower flanging insert of the lower flanging assembly, and during the horizontal operation, the corresponding position of the part blank is flanging downward.

[0012] Furthermore, the lower flanging assembly also includes a limiting guide group and a power transmission group. The lower flanging insert is arranged on the power output end of the power transmission group with the cooperation of the driving guide plate. The power transmission group and the lower flanging insert are respectively arranged on the upper mold base through the limiting guide group at the corresponding position. The power input end of the power transmission group is connected to the power output end of the corresponding driving cylinder.

[0013] The preferred embodiment of the above scheme is that the power transmission component group includes multiple sets of transmission blocks whose number is equivalent to the flanging drive requirements of the lower flanging component, and the limiting guide component group includes side guide plates, bottom guide plates and cover plates. Each set of transmission blocks is movably arranged on the upper die base through the corresponding side guide plates, bottom guide plates and cover plates, and the lower flanging inserts are arranged on the upper die base through another set of side guide plates and another set of bottom guide plates to adapt to the position of the driving guide plates. The transmission block is connected to the power output end of the corresponding driving cylinder, and the lower flanging insert is slidingly connected to the corresponding transmission block through the driving guide plate; during the lower flanging process, the driving cylinder drives the transmission block under the control of the control component, and the transmission block drives the lower flanging insert to run horizontally in cooperation with the driving guide plate to perform downward flanging on the corresponding position of the part blank.

[0014] Furthermore, the driving cylinder includes a flanging driving cylinder and a return driving cylinder, and the control component includes a sensing system and a driving gas delivery and control system. The data lines of the sensing system and the driving gas delivery and control system are connected to the PLC module of the press, and at least the flanging driving cylinder is connected to an external high-pressure gas source through the driving gas delivery and control system. The induction system at least includes sensors, cables, quick-connect connectors, distribution boards and electrical boxes; the driving gas delivery and control system at least includes inlet pipes, outlet pipes, pressure gauges, speed control valves, three-way connectors and inlet and outlet gas line connectors. An R-angle flanging structure is provided at the corresponding flanging position of the lower flanging insert. The lower flanging insert running horizontally under the drive of the flanging drive cylinder first contacts the stamped part blank in the horizontal direction through the R-angle flanging structure, and restricts the part blank from flanging in the opposite direction. Then, the entire R angle of the R-angle flanging structure and the vertical flanging surface contact the part blank to complete the downward flanging of the product.

[0015] The beneficial effects of the present invention are as follows: the technical solution provided in the present application is based on the existing stamping die including a pressing module group, a punching module group and a trimming module group, and is combined with the structural characteristics that the pressing module group, the punching module group and the trimming module group are arranged on the upper die base and the lower die base in a position-adaptive manner, and the upper die base and the lower die base are arranged on the press in a position-adaptive manner. By adding an upper flanging module group and a lower flanging drive module group, the composite over-limit stamping die of the present application is formed, and the upper flanging module group and the lower flanging drive module group are arranged on the upper die base and the lower die base in a position-adaptive manner relative to each other and between the pressing module group, the punching module group and the trimming module group; then, after the stamped part blank is stabilized by the pressing module group, it is trimmed and punched by the punching module group and the trimming module group, and at the same time, the corresponding positions of the part blank are respectively flanged upward and downward by the upper flanging module group and the lower flanging drive module group. Since the composite over-limit stamping die of the present application adds a lower flanging drive module on the basis of the newly added upper flanging module group, the composite over-limit stamping provided by the present application can complete the trimming, punching, upper flanging and lower flanging work at one time with the help of the increased downward flanging driving force of the lower flanging drive module during trimming, punching and upward flanging, thereby effectively reducing the required pressure of the press and achieving the purpose of upper and lower flanging at one time while trimming and punching, thereby achieving the purpose of using a smaller pressure press to perform multiple processes simultaneously beyond the pressure limit of the press, which not only saves production costs but also effectively reduces the investment in equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an existing die involved in the composite over-limit stamping die for a limited pressure press of the present invention; Figure 2 Schematic diagram of the main cross-sectional structure of the composite over-limit stamping die for a limited pressure press according to the present invention; Figure 3 for Figure 2 A magnified view of part A; Figure 4 Schematic side cross-sectional structure of a composite over-limit stamping die for a limited pressure press according to the present invention; Figure 5 for Figure 4 B-section enlarged view; Figure 6 It is a schematic structural diagram of the upwardly flanging of the lower die of the composite over-limit stamping die for a limited pressure press according to the present invention; Figure 7 This is a layout diagram of the main structure of the upper die involved in the composite over-limit stamping die for a limited pressure press of the present invention; Figure 8 A bottom view of the downward flange structure involved in the composite over-limit stamping die for a limited pressure press of the present invention; Figure 9 for Figure 8 Front side view.

[0017] Marked in the figure are: upper die base 1, lower die base 2, part blank 3, profile supporting punch 4, pressing plate 5, inclined wedge block 6, side punching punch 7, side trimming knife block 8, upper flanging insert 9, pulley 10, upper guide plate 11, lower guide plate 12, 45° inclined guide surface 13, lower flanging insert 14, flanging drive cylinder 15, transmission block 16, side guide plate 17, bottom guide plate 18, cover plate 19, return drive cylinder 20, R-angle flanging structure 21, sensor 22, cable 23, quick plug connector 24, distribution board 25, electrical box 26, air inlet pipe 27, air outlet pipe 28, air pressure gauge 29, speed control valve 30, three-way connector 31, inlet and outlet air connector 32. DETAILED DESCRIPTION

[0018] like Figures 1 to 9The present invention shows a composite over-limit stamping die for a limited pressure press that can effectively reduce the required pressure of the press and perform upper and lower flanging while trimming and punching. The composite over-limit stamping die includes a pressing module group, a punching module group and a trimming module group. The pressing module group, the punching module group and the trimming module group are arranged on the upper die base 1 and the lower die base 2 in a manner that is adapted to each other. The upper die base 1 and the lower die base 2 are arranged on the press in a manner that is adapted to each other. The composite over-limit stamping die also includes an upper flanging module group and a lower flanging drive module group. The upper flanging module group and the lower flanging drive module group are arranged on the upper die base 1 and the lower die base 2 in a manner that is adapted to each other and to the pressing module group, the punching module group and the trimming module group. After the stamped part blank 3 is stabilized by the pressing module group, the punching module group and the trimming module group perform trimming and punching, while the upper flanging module group and the lower flanging drive module group perform upper and lower flanging on the corresponding positions of the part blank 3. The technical solution provided by the present application is based on the existing stamping die including a pressing module group, a punching module group and a trimming module group, and is combined with the structural characteristics that the pressing module group, the punching module group and the trimming module group are arranged on the upper die base and the lower die base in a position-adaptive manner, and the upper die base and the lower die base are arranged on the press in a position-adaptive manner. By adding an upper flanging module group and a lower flanging drive module group, the composite over-limit stamping die of the present application is formed, and the upper flanging module group and the lower flanging drive module group are arranged on the upper die base and the lower die base in a position-adaptive manner relative to each other and between the pressing module group, the punching module group and the trimming module group; then, after the stamped part blank is stabilized by the pressing module group, it is trimmed and punched by the punching module group and the trimming module group, and the corresponding positions of the part blank are respectively flanged up and down by the upper flanging module group and the lower flanging drive module group. Since the composite over-limit stamping die of the present application adds a lower flanging drive module on the basis of the newly added upper flanging module group, the composite over-limit stamping provided by the present application can complete the trimming, punching, upper flanging and lower flanging work at one time with the help of the increased downward flanging driving force of the lower flanging drive module during trimming, punching and upward flanging, thereby effectively reducing the required pressure of the press and achieving the purpose of upper and lower flanging at one time while trimming and punching, thereby achieving the purpose of using a smaller pressure press to perform multiple processes simultaneously beyond the pressure limit of the press, which not only saves production costs but also effectively reduces the investment in equipment.

[0019] Accordingly, in combination with the existing technology, in order to reduce the workload of modifying the composite over-limit stamping die of this application, so as to save improvement costs, and at the same time well achieve the above-mentioned invention purpose of this application, the pressing module group of this application includes a profile supporting punch 4 and a pressing plate 5, the profile supporting punch 4 is arranged on the lower die base 2, and the pressing plate 5 is arranged on the upper die base 1 in accordance with the position of the profile supporting punch 4; the part blank 3 placed on the profile supporting punch 4 is stabilized by the pressing plate 5 on the upper die base 1 through the cooperation of the press input pressure. The composite over-limit stamping die described in the present application also includes an inclined wedge block 6. At this time, the punching module group includes at least a side punching punch 7, and the trimming module group includes at least a side trimming knife block 8. The side punching punch 7 and the side trimming knife block 8 are arranged on the upper die base 1 in a position-adaptive manner through the inclined wedge block 6; the part blank 3 pressed firmly on the profile support punch 4 drives the inclined wedge block 6 to drive the side punching punch 7 and the side trimming knife block 8 to perform trimming and punching during the downward movement of the upper die base 1.

[0020] Furthermore, as the main structure improved in the present application, similarly, in order to simplify the structure of each improved part to the maximum extent while achieving the purpose of the invention of the present application, the upper flanging module group of the present application at least includes an upper flanging insert 9, and combined with the composite over-limit stamping die, it also includes a pulley 10 and a driving guide plate. The pulley 10 is arranged on the lower die base 2, and the driving guide plate is arranged on the upper die base 1 and the pulley 10 in a mutually adaptive manner. The upper flanging insert 9 described in the present application is movably arranged in the profile support punch 4; the part blank 3 pressed firmly on the profile support punch 4 passes through the upper die base 1 running downward, and the pulley 10 drives the upper flanging insert 9 to run upward in cooperation with the driving guide plate to perform upward flanging on the corresponding position. Correspondingly, the driving guide plate described in the present application includes an upper guide plate 11 and a lower guide plate 12, and the upper guide plate 11 and the lower guide plate 12 are respectively provided with a 45° inclined guide surface 13 that adapts to each other. The upper guide plate 11 is arranged on the upper die base 1, and the lower guide plate 12 is arranged on the pulley 10 in a position adapted to the upper guide plate 11; in the process of the upper guide plate 11 moving downward, the lower guide plate 12 is driven to move horizontally by the lower guide plate 12 in cooperation with the 45° inclined guide surface 13, and the pulley 10 is driven to move inward in the horizontal direction. The inward moving pulley 10 drives the upper flanging insert 9 to move upward to flanging the corresponding position of the part blank 3 upward. More specifically, the lower flanging drive module group of the present application includes a lower flanging assembly and a lower flanging drive mechanism. The lower flanging drive mechanism is arranged on the upper die base 1, and the lower flanging assembly is arranged on the upper die base 1 in a manner adapted to the position of the drive guide plate. When the upper die base 1 moves downward to perform an upward flanging on the corresponding position of the part blank 3, the lower flanging drive mechanism drives the lower flanging insert 14 of the lower flanging assembly to perform a downward flanging on the corresponding position of the part blank 3 during the process of running in the horizontal direction. At this time, the lower flanging drive mechanism includes a control assembly and a plurality of drive cylinders whose number is equivalent to the flanging drive requirements of the lower flanging assembly. Each set of drive cylinders is arranged on the upper die base 1 in a manner adapted to the position of the lower flanging assembly. During the lower flanging process, each set of drive cylinders outputs a driving force under the control of the control assembly to drive the lower flanging insert 14 of the lower flanging assembly, and performs a downward flanging on the corresponding position of the part blank 3 during the process of running in the horizontal direction. The lower flanging assembly also includes a limiting guide group and a power transmission group. The lower flanging insert 14 is arranged on the power output end of the power transmission group with the cooperation of the driving guide plate. The power transmission group and the lower flanging insert 14 are respectively arranged on the upper mold base 1 through the limiting guide group at the corresponding position. The power input end of the power transmission group is connected to the power output end of the corresponding driving cylinder.The power transmission component group includes a number of transmission blocks 16 that are equivalent to the flanging drive requirements of the lower flanging component, and the limiting guide component group includes side guide plates 17, bottom guide plates 18 and cover plates 19. Each set of transmission blocks 16 is movably arranged on the upper die base (1) through the corresponding side guide plates 17, bottom guide plates 18 and cover plates 19. The lower flanging insert 14 is arranged on the upper die base (1) through another set of side guide plates 17 and another set of bottom guide plates 18 to adapt to the position of the driving guide plates. The transmission block 16 is connected to the power output end of the corresponding driving cylinder, and the lower flanging insert 14 is connected to the corresponding transmission block sliding 16 through the driving guide plate. During the lower flanging process, the driving cylinder drives the transmission block 16 under the control of the control component, and the transmission block 16 drives the lower flanging insert 14 to run in the horizontal direction with the cooperation of the driving guide plate to perform downward flanging on the corresponding position of the part blank 3.

[0021] At the same time, combined with the existing technology, the driving cylinder of the present application includes a flanging driving cylinder 15 and a return driving cylinder 20, and the control component includes a sensing system and a driving gas delivery and control system. The data lines of the sensing system and the driving gas delivery and control system are connected to the PLC module of the press. At least the flanging driving cylinder 15 is connected to the external high-pressure gas source through the driving gas delivery and control system. The induction system includes at least a sensor 22, a cable 23, a quick-connect connector 24, a distribution board 25 and an electrical box 26; the driving gas delivery and control system includes at least an inlet pipe 27, an outlet pipe 28, a pressure gauge 29, a speed regulating valve 30, a three-way connector 31 and an inlet and outlet gas connection 32. The layout of the induction system and the driving gas delivery and control system is as follows: Figure 8 As shown, An R-angle flanging structure 21 is provided at the corresponding flanging position of the lower flanging insert 14. The lower flanging insert 14 running in the horizontal direction under the drive of the flanging drive cylinder 15 first contacts the stamped part blank 3 in the horizontal direction through the R-angle flanging structure 21, and limits the part blank 3 from flanging in the opposite direction. Then, the entire R angle of the R-angle flanging structure 21 and the vertical flanging surface contact the part blank 3 to complete the downward flanging of the product.

[0022] Example 1 In view of the above situation of the prior art, in order to fully utilize the smaller limited pressure press, the present application has newly designed a mold structure that can reduce the pressure requirement of the press and simultaneously achieve upper and lower flanging.

[0023] 1 The overall structure and movement relationship of the mold Figures 2 to 5 : The product is first placed on the punch, with two identical parts placed on either side of the mold in the Y direction. The punch is fixed to the lower die base. The blank holder and upper die base press downward, with the blank holder first contacting the product, firmly pressing it between the punch and the blank holder. The upper die base continues to move downward, using the drive guide to drive the pulley in the X direction; the pulley drives the upper flanging insert upward, achieving the upward flanging. Simultaneously with the upward flanging, the press activates the drive cylinder assembly, which moves in the Y direction and drives the lower flanging insert, which moves in the X direction, utilizing the rounded corners on the insert to achieve the downward flanging.

[0024] While realizing the upper and lower flanging, when the upper die seat moves downward, it will drive the inclined wedge to move laterally, and the side trimming knife block and the side punching punch are fixed on the inclined wedge, so the side trimming knife block and the side punching punch ultimately realize the trimming and punching of the product laterally.

[0025] 2 The overall structure and motion relationship of the lower die are as follows Figure 6 : The lower punch is fixed to the lower die base. The upper flanging insert is concealed within the lower punch and is moved up and down in the Z direction by pulleys A and B, using a 45° drive guide. During operation, pulleys A and B drive the upper flanging insert in the Z direction, achieving upward flanging. During the press's return stroke, pulleys A and B retract, causing the upper flanging insert to move in the -Z direction and retract into the lower punch.

[0026] 3 The overall structure and motion relationship of the upper die are as follows Figure 7 : The drive cylinder is fixed to the upper die base. Its activation and retraction are controlled by the press's PLC program. During operation, the drive cylinder pushes the transmission block in the Y direction, which, with the aid of a 45-degree drive guide, pushes the lower flanging insert in the X direction. This mold set contains four sets of these flanging components.

[0027] The structural principle and motion relationship of the new bottom flanging die are as follows Figure 8 and Figure 9 As shown: The drive cylinder is mounted on the upper die base via a cylinder mounting flange. The drive cylinder is connected to the press control system via an air system and to the factory air supply via air pipes and other accessories. When the drive cylinder receives a work command, the cylinder rod extends, pushing the transmission block in the -Y direction. The transmission block has side guides on either side of the X direction and a bottom guide and cover plate on either side of the Z direction, limiting its extension and retraction movement to the Y direction. The transmission block, via two drive guides, pushes the lower flange insert in the X direction. Side and bottom guides, as well as a cover plate, guide the lower flange insert in the Y and Z directions, limiting its reciprocating movement to the X direction. A position sensor detects the flange's position. The sensing system consists of a sensor, cable, quick-connect connector, distribution board, and electrical box. The cylinder's extension and retraction movement is connected via an air inlet and outlet pipe, a pressure gauge, a speed control valve, and a T-joint. This connection is then connected to the factory air supply via an air line connector.

[0028] The flanging insert moves in the X direction, directly contacting the edge of the product. The concave R angle on the flanging insert is then used to flanging the product in the -Z direction. This new structure utilizes the telescopic motion of the cylinder to push the transmission block in the Y direction, further pushing the flanging insert in the X direction. Finally, the concave R angle of the flanging insert is cleverly used to flanging the product in the Z direction.

[0029] Ultimately, the downward flanging force is entirely handled by the four sets of drive cylinders, adding no pressure to the press slide, thus reducing the pressure required by the press. Ultimately, this mold requires a trimming and punching force of 125 tons and an upward flanging force of 155 tons, for a total of 280 tons, while the press can only provide 320 tons of pressure.

Claims

1. A composite over-limit stamping die for a limited pressure press, comprising a pressing module group, a punching module group and a trimming module group, wherein the pressing module group, the punching module group and the trimming module group are arranged on an upper die base (1) and a lower die base (2) in a manner that is adapted to each other, and wherein the upper die base (1) and the lower die base (2) are arranged on the press in a manner that is adapted to each other, and wherein: The composite over-limit stamping die further comprises an upper flanging module group and a lower flanging drive module group, and the upper flanging module group and the lower flanging drive module group are arranged on the upper die base (1) and the lower die base (2) in a manner that their positions are adapted to each other and to the positions of the pressing module group, the punching module group and the trimming module group; after the stamped part blank (3) is stabilized by the pressing module group, the punching module group and the trimming module group are used for trimming and punching, and at the same time, the upper flanging module group and the lower flanging drive module group are used for upper flanging and lower flanging of the corresponding positions of the part blank (3).

2. The composite over-limit stamping die for a limited pressure press according to claim 1, characterized in that: The pressing module group includes a profile supporting punch (4) and a pressing plate (5), wherein the profile supporting punch (4) is arranged on the lower die base (2), and the pressing plate (5) is arranged on the upper die base (1) in a position adapted to the profile supporting punch (4); the part blank (3) placed on the profile supporting punch (4) is pressed and stabilized by the pressing plate (5) on the upper die base (1) in cooperation with the input pressure of the press.

3. The composite over-limit stamping die for a limited pressure press according to claim 2, characterized in that: The composite over-limit stamping die further comprises an inclined wedge block (6), a punching module group comprises at least a side punching punch (7), and a trimming module group comprises at least a side trimming knife block (8), the side punching punch (7) and the side trimming knife block (8) are arranged on the upper die seat (1) in a manner adapted to the position of the inclined wedge block (6); the part blank (3) pressed firmly on the profile support punch (4) drives the inclined wedge block (6) to drive the side punching punch (7) and the side trimming knife block (8) to perform trimming and punching during the downward movement of the upper die seat (1).

4. The composite over-limit stamping die for a limited pressure press according to claim 2 or 3, characterized in that: The upper flanging module group includes at least an upper flanging insert (9), and the composite over-limit stamping die also includes a pulley (10) and a driving guide plate, the pulley (10) is arranged on the lower die base (2), and the driving guide plate is arranged on the upper die base (1) and the pulley (10) in a mutually adaptive manner, and the upper flanging insert (9) is movably arranged in the profile support punch (4); the part blank (3) pressed and stabilized on the profile support punch (4) passes through the upper die base (1) running downward, and in the process of the upper flanging insert (9) running upward by driving the pulley (10) in cooperation with the driving guide plate, the corresponding position is flanging upward.

5. The composite over-limit stamping die for a limited pressure press according to claim 4, characterized in that: The driving guide plate comprises an upper guide plate (11) and a lower guide plate (12), and the upper guide plate (11) and the lower guide plate (12) are respectively provided with 45° inclined guide surfaces (13) adapted to each other. The upper guide plate (11) is arranged on the upper die base (1), and the lower guide plate (12) is arranged on the pulley (10) in a position adapted to the upper guide plate (11); in the process of the upper guide plate (11) moving downward, the lower guide plate (12) is driven to move horizontally by the cooperation of the 45° inclined guide surface (13), and the pulley (10) is driven to move inwardly in the horizontal direction; the pulley (10) moving inwardly drives the upper flanging insert (9) to move upward to perform upward flanging on the corresponding position of the part blank (3).

6. The composite over-limit stamping die for a limited pressure press according to claim 5, characterized in that: The lower flanging drive module group includes a lower flanging component and a lower flanging drive mechanism, wherein the lower flanging drive mechanism is arranged on the upper die base (1), and the lower flanging component is arranged on the upper die base (1) in a manner adapted to the position of the drive guide plate; while the upper die base (1) moves downward to perform upward flanging on the corresponding position of the part blank (3), the lower flanging drive mechanism drives the lower flanging insert (14) of the lower flanging component to move in the horizontal direction to perform downward flanging on the corresponding position of the part blank (3).

7. The composite over-limit stamping die for a limited pressure press according to claim 6, characterized in that: The lower flanging drive mechanism includes a control component and a plurality of drive cylinders whose number is equivalent to the flanging drive requirements of the lower flanging component, and each set of drive cylinders is arranged on the upper die base (1) in accordance with the position of the lower flanging component; during the lower flanging process, each set of drive cylinders outputs a driving force under the control of the control component to drive the lower flanging insert (14) of the lower flanging component, and during the process of running in the horizontal direction, the corresponding position of the part blank (3) is flanging downward.

8. The composite over-limit stamping die for a limited pressure press according to claim 7, characterized in that: The lower flanging assembly also includes a limiting guide group and a power transmission group. The lower flanging insert (14) is arranged on the power output end of the power transmission group in cooperation with the driving guide plate. The power transmission group and the lower flanging insert (14) are movably arranged on the upper mold base (1) through the limiting guide group at the corresponding position. The power input end of the power transmission group is connected to the power output end of the corresponding driving cylinder.

9. The composite over-limit stamping die for a limited pressure press according to claim 8, characterized in that: The power transmission component group includes a plurality of transmission blocks (16) whose number is equivalent to the flanging drive requirements of the lower flanging component, and the limiting guide component group includes a side guide plate (17), a bottom guide plate (18) and a cover plate (19). Each set of transmission blocks (16) is movably arranged on the upper die base (1) through the corresponding side guide plate (17), the bottom guide plate (18) and the cover plate (19). The lower flanging insert (14) is arranged on the upper die base (1) through another set of side guide plates (17) and another set of bottom guide plates (18) in accordance with the position of the driving guide plate. The transmission block (16) is connected to the power output end of the corresponding driving cylinder, and the lower flanging insert (14) is slidably connected to the corresponding transmission block (16) through the driving guide plate. During the lower flanging process, the driving cylinder drives the transmission block (16) under the control of the control component, and the transmission block (16) drives the lower flanging insert (14) in cooperation with the driving guide plate to perform downward flanging on the corresponding position of the part blank (3) during the process of running in the horizontal direction.

10. The composite over-limit stamping die for a limited pressure press according to claim 9, characterized in that: The driving cylinder includes a flanging driving cylinder (15) and a return driving cylinder (20), and the control component includes a sensing system and a driving gas delivery and control system. The data lines of the sensing system and the driving gas delivery and control system are connected to the PLC module of the press. At least the flanging driving cylinder (15) is connected to an external high-pressure gas source through the driving gas delivery and control system. The sensing system at least includes a sensor (22), a cable (23), a quick-connect connector (24), a distribution board (25) and an electrical box (26); the driving gas delivery and control system at least includes an air inlet pipe (27), an air outlet pipe (28), a pressure gauge (29), a speed regulating valve (30), a three-way connector (31) and an air inlet and outlet gas path connector (32). An R-angle flanging structure (21) is provided at a corresponding flanging position of the lower flanging insert (14). The lower flanging insert (14) running in a horizontal direction under the drive of the flanging driving cylinder (15) first contacts the stamped part blank (3) in a horizontal direction through the R-angle flanging structure (21) and restricts the part blank (3) from flanging in the opposite direction. Then, the entire R angle and the vertical flanging surface of the R-angle flanging structure (21) contact the part blank (3) to complete the downward flanging of the product.

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