Automobile outer panel press die

Abstract

The application discloses a kind of automobile outer plate stamping die, it is related to automobile sheet metal processing technical field, including upper die, lower die mechanism and support mechanism, the bottom surface center position of the upper die is connected with upper die core, the lower die mechanism includes first template and second template, the support mechanism includes bottom plate.The application is driven by hydraulic cylinder when upper die returns, and the second piston is driven upward by double-end bent rod, the effect that the air pressure above second sealing cylinder increases is realized, and the inside of first sealing cylinder is filled with excess gas through three-way pipeline, and the first piston is lifted upward by air pressure, and the die bottom is moved upward by the first piston through the first sliding rod, so that the processed automobile outer plate is displaced in vertical direction, so that the inner side wall of automobile outer plate and die core are no longer connected, the difficulty of subsequent demolding is reduced, the overall demolding of subsequent automobile outer plate is facilitated, and the rate of production line batch stamping is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile sheet metal processing, in particular to an automobile outer plate stamping die. BACKGROUND

[0002] The automobile plate refers to the steel plate for automobiles, and the main raw material of the automobile plate is cold-rolled plate and hot-rolled plate formed into a coil steel. The coil steel is formed into a steel strip by using the unwinding setting of the production line to move directionally, and then the steel strip is periodically stamped downward by using the stamping die to form the automobile outer plate required by the automobile and realize batch production.

[0003] In the prior art, such as the "automobile outer plate stamping die" with Chinese patent number CN212121414U, the punch and the die are matched up and down, and the die is installed at the top end of the base. The die includes an inner die and a square frame, and the inner die is located inside the square frame. A plurality of hydraulic buffers are arranged between the square frame and the base. The front conveying frame and the rear conveying frame are respectively installed at the front end and the rear end of the square frame. A plurality of conveying wheels are arranged on the outer side of the rotating shaft. The top end of the square frame is provided with a plurality of positioning columns for positioning the sheet metal.

[0004] However, in the prior art, the production raw material of the automobile outer plate is a steel strip. When batch production is carried out, the steel strip needs to be moved directionally downward. During the downward stamping process, the steel strip will be closely attached to the inner wall of the die core, which affects the improvement of the demolding efficiency of the subsequent automobile outer plate. When the automobile outer plate is not completely demolded, the steel strip cannot be moved directionally in the horizontal direction, which affects the subsequent processing efficiency. SUMMARY

[0005] The purpose of the present application is to provide an automobile outer plate stamping die to solve the problem that the steel strip will be closely attached to the inner wall of the die core during the downward stamping process, which affects the improvement of the demolding efficiency of the subsequent automobile outer plate. When the automobile outer plate is not completely demolded, the steel strip cannot be moved directionally in the horizontal direction, which affects the subsequent processing efficiency.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an automobile outer plate stamping die, comprising an upper die, a lower die mechanism and a supporting mechanism, the bottom surface center position of the upper die is connected with an upper die core, the lower die mechanism comprises a first die plate and a second die plate, the supporting mechanism comprises a bottom plate, the top end of the bottom plate is fixedly connected with the second die plate, and the top end of the second die plate is fixedly connected with the first die plate. The processing die for the automobile outer plate mainly comprises the upper die and the first die plate. The bottom surface of the upper die is provided with the upper die core, the top surface of the first die plate is provided with a matching lower die groove, the lower die groove and the die bottom jointly form a lower die core, and the upper die core and the lower die core realize the stamping function of the sheet metal.

[0007] The lower mold groove is fixedly connected with a limiting ring at the bottom end, the outer side wall of the limiting ring is slidably connected with a mold bottom, the outer side wall of the mold bottom is fixedly connected with a supporting plate, the mold bottom is movably connected with the second mold plate, the top end of the second mold plate is fixedly connected with two top supporting assemblies, the mold bottom is a shell structure with an open top end, a supporting plate is arranged on the outer side of the top end of the mold bottom, the supporting plate is a flange structure extending outward from the top end of the mold bottom, and the bottom end of the supporting plate is subjected to the action force of the top supporting assembly, so that the mold bottom pushes out the work material in the lower mold groove outward.

[0008] The top end of the first sealing cylinder is fixedly connected with a guide ring, the inner side wall of the first sealing cylinder is slidably connected with a first piston, the top end of the first piston is fixedly connected with a first sliding rod, the top end of the first sliding rod is fixedly connected with a supporting plate, and the outer side wall of the first sliding rod is slidably connected with the inner side wall of the guide ring.

[0009] Preferably, the top surface of the bottom plate is fixedly connected with a connecting column at four corner positions, and the top end of the connecting column is fixedly connected with a top plate.

[0010] Preferably, the top surface of the top plate is fixedly connected with a hydraulic cylinder, and the output end of the hydraulic cylinder penetrates the bottom wall of the top plate and is fixedly connected with the top surface of the upper mold.

[0011] Preferably, the bottom surface of the bottom plate is fixedly connected with a brake wheel at four corner positions, and the bottom plate and the top plate are fixedly connected with a limiting column, and the outer side wall of the limiting column is slidably connected with a sliding seat.

[0012] Preferably, the bottom plate and the top plate are fixedly connected with a limiting column, and the outer side wall of the limiting column is slidably connected with a sliding seat.

[0013] Preferably, the top end of the mold bottom and the first mold plate are provided with magnets with opposite magnetic properties.

[0014] Preferably, the two ends of the double-head bent rod are fixedly connected with a limiting frame, and the inner side wall of the limiting frame is rotatably connected with a pulley.

[0015] Preferably, the bottom end of the limiting frame is fixedly connected with a second sliding rod, and the bottom end of the second sliding rod is fixedly connected with a second piston.

[0016] Preferably, the outer side wall of the second piston is slidably connected with the inner side wall of the second sealing cylinder, and a three-way pipeline is arranged between the two second sealing cylinders.

[0017] Preferably, two ends of the three-way pipeline are fixedly connected with top ends of the second sealing barrels respectively, a sealing ring is arranged between the second sealing barrel and the second sliding rod, and the other end of the three-way pipeline is fixedly connected with the air inlet of the first sealing barrel.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1、In the present application, when the upper die is returned by the hydraulic cylinder, the upper die is driven by the double-head bent rod to move the second piston upward, achieving the effect of increasing the air pressure above the second sealing barrel. The excess gas fills the inside of the first sealing barrel through the three-way pipeline, and the air pressure pushes the first piston upward, which drives the die bottom to move upward through the first sliding rod, so that the processed automobile outer plate is displaced in the vertical direction, so that the automobile outer plate is no longer connected to the inner side wall of the die core, reducing the difficulty of subsequent demolding, facilitating the overall demolding of the subsequent automobile outer plate, and improving the rate of batch stamping of the production line.

[0020] 2、In the present application, two sliding seats are arranged on the outside of the upper die, and the sliding seats move vertically under the limitation of the connecting column. The sliding seats are limited on the outside of the connecting column, so that the upper die slides in the vertical direction, so that when the upper die moves above the first die plate, the upper die core is precisely connected to the lower die groove, thereby improving the forming quality of the automobile outer plate.

[0021] 3、In the present application, when the upper die is moved by the hydraulic cylinder, the upper die drives the limiting frame to move through the double-head bent rod. When stamping downward, the limiting frame drives the second sliding rod to move downward, and the second sliding rod is completely accommodated in the inside of the second sealing barrel. The limiting frame does not contact the automobile outer plate above, so that the automobile outer plate is directly stamped by the action of the upper die and the first die plate. During the upward return process, the second sliding rod in the second sealing barrel extends upward, the limiting frame supports the automobile outer plate outside the die core upward, and drives the automobile outer plate in the die core to be completely demolded. Rollable pulleys are arranged in the inside of the limiting frame, so as to facilitate the horizontal movement of the steel coil, and the effect of completely demolding the automobile outer plate in the die core is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the automobile outer plate stamping die of the present application;

[0023] Figure 2 It is a schematic diagram of the bottom end structure of the automobile outer plate stamping die of the present application;

[0024] Figure 3 It is a schematic diagram of the structure of the lower die mechanism of the automobile outer plate stamping die of the present application;

[0025] Figure 4It is a side sectional view of a side face of a middle supporting and top mechanism of a stamping die for an automobile outer plate according to the present application;

[0026] Figure 5 It is a side sectional view of a lower die mechanism of a stamping die for an automobile outer plate according to the present application;

[0027] Figure 6 It is an explosion effect diagram of a lower die mechanism of a stamping die for an automobile outer plate according to the present application;

[0028] Figure 7 It is a partial structure schematic diagram of a second die plate of a stamping die for an automobile outer plate according to the present application;

[0029] Figure 8 It is a middle A place local structure enlarged effect diagram according to the present application. Figure 5

[0030] In the figure: 1, upper die; 11, upper die core; 2, lower die mechanism; 21, first die plate; 22, second die plate; 23, lower die groove; 24, limiting ring; 25, supporting and top assembly; 251, first sealing cylinder; 252, first piston; 253, first sliding rod; 254, supporting plate; 255, guide ring; 26, die bottom; 27, supporting plate; 3, hydraulic cylinder; 4, supporting and top mechanism; 41, second sealing cylinder; 42, second sliding rod; 43, limiting frame; 44, pulley; 45, double-head bent rod; 46, connecting rod; 47, three-way pipeline; 48, second piston; 5, supporting mechanism; 51, bottom plate; 52, top plate; 53, brake wheel; 54, connecting column; 55, limiting column; 56, sliding seat. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Embodiment one

[0032] According to Figures 1-8 It is a stamping die for an automobile outer plate, which comprises an upper die 1, a lower die mechanism 2 and a supporting mechanism 5, the bottom surface center position of the upper die 1 is connected with an upper die core 11, the lower die mechanism 2 comprises a first die plate 21 and a second die plate 22, the supporting mechanism 5 comprises a bottom plate 51, the top end of the bottom plate 51 is fixedly connected with the second die plate 22, and the top end of the second die plate 22 is fixedly connected with the first die plate 21;

[0033] ​The first template 21 is provided with a lower die groove 23 at the center of the top surface, the bottom end of the lower die groove 23 is fixedly connected with a limiting ring 24, the outer side wall of the limiting ring 24 is slidably connected with a die bottom 26, the outer side wall of the die bottom 26 is fixedly connected with a supporting plate 27, the die bottom 26 is movably connected with the second template 22, and the top end of the second template 22 is fixedly connected with two top supporting assemblies 25.

[0034] The top supporting assembly 25 comprises a first sealing cylinder 251, the top and bottom ends of the first sealing cylinder 251 are provided with air inlets, the top end of the first sealing cylinder 251 is fixedly connected with a guide ring 255, the inner side wall of the first sealing cylinder 251 is slidably connected with a first piston 252, the top end of the first piston 252 is fixedly connected with a first sliding rod 253, the top end of the first sliding rod 253 is fixedly connected with a supporting plate 254, and the outer side wall of the first sliding rod 253 is slidably connected with the inner side wall of the guide ring 255.

[0035] In the embodiment, the machining die for the automobile outer plate mainly comprises an upper die 1 and a first template 21, the bottom surface of the upper die 1 is provided with an upper die core 11, the top surface of the first template 21 is provided with a lower die groove 23 matched with the upper die core 11, the lower die groove 23 and a die bottom 26 jointly form a lower die core, the upper die core 11 and the lower die core realize the stamping function of the sheet metal, the lower side of the first template 21 is provided with a second template 22, the bottom end of the upper die 1 is provided with a pin for positioning between the dies, the surface of the second template 22 is provided with a pin hole matched with the pin, and the second template 22 plays a role of secondary buffering for the downward stamping of the first template 21.

[0036] The outer side of the lower die groove 23 is a solid body, the bottom end of the lower die groove 23 is provided with a limiting ring 24, the outer side of the limiting ring 24 is a hollow body, and the outer side of the limiting ring 24 is sleeved with the die bottom 26, wherein the die bottom 26 is a shell structure with an open top end, the outer side of the top end of the die bottom 26 is provided with a supporting plate 27, the supporting plate 27 is a flange structure extending outward from the top end of the die bottom 26, so that the bottom end top supporting assembly 25 can exert force on the supporting plate 27, and the die bottom 26 can push the workpiece in the lower die groove 23 outward;

[0037] The top supporting assembly 25 is arranged in the second template 22, the first sealing cylinder 251 is fixedly embedded in the second template 22, the bottom end of the first sealing cylinder 251 is provided with an air inlet for air charging, air is charged into the first sealing cylinder 251 through the air inlet, the air pressure pushes the first piston 252 to lift upward, so that the first piston 252 drives the first sliding rod 253 above to slide upward, so that the first sliding rod 253 drives the connected supporting plate 254 to move upward, the supporting plate 254 is arranged between the first sliding rod 253 and the supporting plate 27, the contact area of the first sliding rod 253 and the supporting plate 27 is increased by the supporting plate 254, and the first sliding rod 253 is more stable when lifting the supporting plate 27 upward.

[0038] The guide ring 255 is arranged at the top end of the first sealing cylinder 251, the outer side wall of the first sliding rod 253 is further guided to slide by the guide ring 255, the first sliding rod 253 is limited by the double-layer limiting action of the first piston 252 at the bottom end and the guide ring 255 at the middle part, the first sliding rod 253 always moves in the track of the axis of the first sealing cylinder 251, the vertical upward movement of the first sliding rod 253 is guaranteed, finally the mold base 26 is stably upwardly supported, the mold base 26 drives the upward movement of the automobile outer plate processed inside, so that the automobile outer plate processed has a small displacement in the vertical direction, the automobile outer plate is demolded from the inner side wall of the mold core, the demolding auxiliary effect of the workpiece in the mold core is realized, and the overall demolding of the automobile outer plate is facilitated. Embodiment two

[0039] According to Figure 1 , Figure 2 , Figure 3 and Figure 6 , the top surface of the bottom plate 51 is fixedly connected with the connecting column 54 at four corner positions, and the top end of the connecting column 54 is fixedly connected with the top plate 52. The top surface of the top plate 52 is fixedly connected with the hydraulic cylinder 3, and the output end of the hydraulic cylinder 3 penetrates through the bottom wall of the top plate 52 and is fixedly connected with the top surface of the upper mold 1. The bottom surface of the bottom plate 51 is fixedly connected with the brake wheel 53 at four corner positions, and the bottom plate 51 is fixedly connected with the limiting column 55 between the top plate 52, and the outer side wall of the limiting column 55 is slidingly connected with the sliding seat 56.

[0040] In the embodiment, the brake wheel 53 is arranged below the bottom plate 51, the upper mold 1 and the lower mold mechanism 2 can be moved at any time, the moving portability of the mold as a whole is improved, the lower mold mechanism 2 is overlapped above the bottom plate 51, the brake wheel 53 is arranged outside the bottom plate 51 and connected with the top plate 52, the top plate 52 is located above the upper mold 1, the upper mold 1 moves in the space between the bottom plate 51 and the top plate 52, the lower mold mechanism 2 is stably overlapped above the bottom plate 51, the hydraulic cylinder 3 is connected above the top plate 52, the output end of the hydraulic cylinder 3 drives the movement of the upper mold 1, the hydraulic cylinder 3 realizes the downward stamping action of the upper mold 1, after the stamping of the automobile outer plate is completed, the output end of the hydraulic cylinder 3 returns, the hydraulic cylinder 3 drives the upper mold core 11 of the upper mold 1 to separate from the lower mold core of the lower mold mechanism 2, the processed automobile outer plate is conveniently taken out, and new sheet metal raw materials are placed in the direction of the upper mold core 11 for stamping and processing;

[0041] The two sliding seats 56 are arranged outside the upper mold 1, the upper mold 1 slides in the vertical direction by the hydraulic cylinder 3, and also vertically moves under the limiting of the connecting column 54 by the sliding seat 56, the limiting of the sliding seat 56 to the connecting column 54 enables the stable sliding of the upper mold 1 in the vertical direction, the butt joint of the upper mold 1 and the first mold plate 21 is more accurate, the accuracy of the alignment of the upper mold core 11 and the lower mold core is improved, and the forming quality of the automobile outer plate is improved. Embodiment three

[0042] According to Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 , the lower part of the sliding seat 56 is provided with a top supporting mechanism 4, which comprises a connecting rod 46 and two second sealing cylinders 41. The top end of the connecting rod 46 is fixedly connected with the sliding seat 56, and the bottom end of the connecting rod 46 is fixedly connected with a double-head bent rod 45. The top end of the mold base 26 and the first mold plate 21 are provided with magnets with opposite magnetic properties. The two ends of the double-head bent rod 45 are fixedly connected with limiting frames 43, and the inner side wall of the limiting frame 43 is rotatably connected with pulleys 44.

[0043] In this embodiment, the connecting rod 46 is connected with the horizontally arranged double-head bent rod 45, and the two ends of the double-head bent rod 45 are respectively connected with the limiting frames 43. When the hydraulic cylinder 3 drives the upper die 1 to move up and down, the upper die 1 drives the two limiting frames 43 on one side to move up and down through the sliding seat 56.

[0044] When stamping downward, the hydraulic cylinder 3 drives the upper die 1 to move downward, so that the upper die 1 drives the two limiting frames 43 to move downward, and the limiting frames 43 drive the second sliding rods 42 at the bottom to move downward, so that the second sliding rods 42 are completely accommodated in the second sealing cylinders 41, the height of the limiting frames 43 is reduced, the limiting frames 43 do not contact the automobile outer plate above, and the automobile outer plate is directly stamped through the action of the upper die 1 and the first mold plate 21.

[0045] During the upward return process, the hydraulic cylinder 3 drives the upper die 1 to move upward, so that the second sliding rods 42 accommodated in the second sealing cylinders 41 are extended upward, the limiting frames 43 support the automobile outer plate located outside the mold core upward, and drive the automobile outer plate in the mold core to be completely demolded. The limiting frames 43 are provided with rotatable pulleys 44 inside, so as to facilitate the horizontal movement of the steel coil, so that the outer plate processed in the mold core position is shifted, and the unprocessed outer plate is located in the mold core, so as to facilitate the subsequent rapid processing of the automobile mold plate. Embodiment four

[0046] According to Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, the bottom end of the limiting frame 43 is fixedly connected with a second sliding rod 42, and the bottom end of the second sliding rod 42 is fixedly connected with a second piston 48. The outer side wall of the second piston 48 is in sliding connection with the inner side wall of the second sealing cylinder 41, and a three-way pipeline 47 is arranged between the two second sealing cylinders 41. The two ends of the three-way pipeline 47 are fixedly connected with the top end of the second sealing cylinder 41 respectively, and a sealing ring is arranged between the second sealing cylinder 41 and the second sliding rod 42. The other end of the three-way pipeline 47 is fixedly connected with the air inlet of the first sealing cylinder 251.

[0047] In this embodiment, the second sealing cylinder 41 is a shell with an open bottom end, and the inner cavity of the second sealing cylinder 41 is slidingly provided with the second piston 48. When the hydraulic cylinder 3 drives the upper die 1 to move up and down, the double-headed bent rod 45 drives the two limiting frames 43 to move, so that the limiting frame 43 drives the second piston 48 to move through the second sliding rod 42;

[0048] When stamping, the second piston 48 slides downward, so that the air pressure above the second piston 48 decreases, and the excess gas is sucked into the first sealing cylinder 251 through the three-way pipeline 47, so that the internal air pressure of the first sealing cylinder 251 is extracted, and the die bottom 26 and the supporting plate 27 are reset to the lowest end by the magnetic repulsive force, so that the outer plate is completely placed in the mold core for processing. When the hydraulic cylinder 3 returns, the second piston 48 moves upward, so that the air pressure above the second piston 48 increases, so that the excess gas fills the inside of the first sealing cylinder 251 through the three-way pipeline 47, and the first piston 252 supports the die bottom 26 upward, so as to achieve the effect of partial demolding in the mold core.

[0049] The working principle and method of using the device are as follows: when producing and processing, the coiled steel is placed on the unwinding station, and the steel belt is overlapped above the four pulleys 44. One side of the steel belt is processed by the upper die 1 and the lower die mechanism 2, and the other side is moved directionally;

[0050] When stamping, the hydraulic cylinder 3 is started, and the output end of the hydraulic cylinder 3 drives the upper die 1 to move downward. The upper die 1 drives the double-headed bent rod 45 to move downward through the sliding seat 56, the double-headed bent rod 45 drives the limiting frame 43 to move downward, and the limiting frame 43 drives the second sliding rod 42 to be stored in the second sealing cylinder 41, so that the pulley 44 is no longer overlapped with the steel belt, and the steel belt is above the first die plate 21. The upper die core 11 of the upper die 1 exerts a stamping action on the steel belt, so that the steel belt is placed in the lower die groove 23 and shaped into an automobile outer plate;

[0051] Then, the hydraulic cylinder 3 reversely moves to drive the upper die 1 to return. The upper die 1 drives the limiting frame 43 to move upward, and the limiting frame 43 and the pulley 44 lift the outer side of the steel belt;

[0052] At the same time, the second piston 48 moves upward, so that the air pressure above the second piston 48 increases, so that the excess gas fills the inside of the first sealing cylinder 251 through the three-way pipeline 47, and the first sealing cylinder 251 is inflated and pressurized, the air pressure pushes the first piston 252 to lift upward, the first piston 252 drives the first sliding rod 253 to slide upward, so that the first sliding rod 253 drives the connected supporting plate 254 to move upward, so that the mold base 26 drives the internally processed automobile plate to move upward, the processed automobile outer plate produces a small displacement in the vertical direction, so that the automobile outer plate is demolded from the inner side wall of the mold core;

[0053] Finally, through the double supporting effect of the pulley 44 and the supporting plate 254, the automobile outer plate is placed again between the upper die 1 and the first mold plate 21 together with the steel belt, the movement of the steel belt is guided by the pulley 44, so that the outer plate processed in the position of the mold core is displaced, and the unprocessed outer plate is placed in the mold core, so as to facilitate the subsequent rapid processing of the automobile mold plate.

[0054] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An automobile outer panel press die comprising an upper die (1), a lower die mechanism (2), and a support mechanism (5), characterized by: The upper mold (1) is connected with an upper mold core (11) at the center position of the bottom surface, the lower mold mechanism (2) comprises a first mold plate (21) and a second mold plate (22), the supporting mechanism (5) comprises a bottom plate (51), the top end of the bottom plate (51) is fixedly connected with the second mold plate (22), and the top end of the second mold plate (22) is fixedly connected with the first mold plate (21); A lower mold groove (23) is formed at the center position of the top surface of the first mold plate (21), the bottom end of the lower mold groove (23) is fixedly connected with a limiting ring (24), the outer side wall of the limiting ring (24) is slidably connected with a mold base (26), the outer side wall of the mold base (26) is fixedly connected with a supporting plate (27), the mold base (26) is movably connected with the second mold plate (22), and the top end of the second mold plate (22) is fixedly connected with two top supporting assemblies (25); The top supporting assembly (25) comprises a first sealing cylinder (251), the bottom end of the first sealing cylinder (251) is provided with an air inlet, the top end of the first sealing cylinder (251) is fixedly connected with a guide ring (255), the inner side wall of the first sealing cylinder (251) is slidably connected with a first piston (252), the top end of the first piston (252) is fixedly connected with a first sliding rod (253), the top end of the first sliding rod (253) is fixedly connected with a supporting plate (254), and the outer side wall of the first sliding rod (253) is slidably connected with the inner side wall of the guide ring (255); The top surface of the bottom plate (51) is fixedly connected with a connecting column (54) at four corner positions, the top end of the connecting column (54) is fixedly connected with a top plate (52), and the bottom plate (51) and the top plate (52) are fixedly connected with a limiting column (55); A top supporting mechanism (4) is arranged below the sliding seat (56), the top supporting mechanism (4) comprises a connecting rod (46) and two second sealing cylinders (41), the top end of the connecting rod (46) is fixedly connected with the sliding seat (56), and the bottom end of the connecting rod (46) is fixedly connected with a double-head bent rod (45); The two ends of the double-head bent rod (45) are fixedly connected with limiting frames (43), and the inner side wall of the limiting frame (43) is rotatably connected with a pulley (44); The bottom end of the limiting frame (43) is fixedly connected with a second sliding rod (42), and the bottom end of the second sliding rod (42) is fixedly connected with a second piston (48); The outer side wall of the second piston (48) is slidably connected with the inner side wall of the second sealing cylinder (41), and a three-way pipeline (47) is arranged between the two second sealing cylinders (41); The two ends of the three-way pipeline (47) are fixedly connected with the top end of the second sealing cylinder (41), respectively, a sealing ring is arranged between the second sealing cylinder (41) and the second sliding rod (42), and the other end of the three-way pipeline (47) is fixedly connected with the air inlet of the first sealing cylinder (251).

2. The stamping die for an automobile outer panel according to claim 1, characterized by: The top surface of the top plate (52) is fixedly connected with a hydraulic cylinder (3), and the output end of the hydraulic cylinder (3) penetrates the bottom wall of the top plate (52) and is fixedly connected with the top surface of the upper die (1).

3. The stamping die for an automobile outer panel according to claim 2, characterized by: The bottom surface of the bottom plate (51) is fixedly connected with brake wheels (53) at four corner positions.

4. The stamping die for an automobile outer panel according to claim 1, characterized by: The top end of the die base (26) and the first die plate (21) are provided with magnets with opposite magnetism.

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