A stamping die for a back door outer panel

Abstract

The application relates to a stamping die for a back door outer plate and belongs to the technical field of stamping dies. The stamping die comprises an upper die and a lower die, the top of the lower die is provided with a sliding seat capable of sliding to the bottom of the center of a pressing cavity, the top surface of the sliding seat is connected with the edge corner of a convex die core and the top surface of the adjacent side, an angle wedge slides obliquely downward to the edge corner of the top of the sliding seat, a negative edge corner flange wrapped on the outer wall of the edge corner of the top of the sliding seat is formed on a plate, and a side wedge slides obliquely downward to one side of the pressing cavity, a negative corner side flange wrapped on the outer wall of one side of the top of the sliding seat is formed on the plate. In the scheme, the corner pressing block and the side pressing block can simultaneously stamp one side of the pressing cavity, so that the negative edge corner flange and the negative corner side flange are formed at the edge of the plate, the linkage stamping of the corner pressing block and the side pressing block improves the production efficiency of the stamping die, the side shaping of the edge of the plate can be completed in one set of die, the plate can be taken out without influence under the cooperation of the sliding seat, and the use cost of the die is reduced.

Description

Technical Field

[0001] This invention belongs to the field of stamping die technology, and relates to a stamping die for a back door outer panel. Background Technology

[0002] Stamping dies typically consist of an upper die and a lower die. The connection between the upper and lower dies has a pressure cavity for stamping sheet metal. Using the power of conventional or specialized stamping equipment, the stamping die directly subjects the sheet metal to deformation forces within the pressure cavity of the die, thereby obtaining parts with specific shapes, dimensions, and properties. Therefore, it can be used to produce metal parts for automobiles. The tailgate outer panel and tailgate inner panel are used together and installed at the rear of the car as the tailgate of the trunk.

[0003] However, the existing back panel stamping dies still have some shortcomings. During the stamping and shaping process, the bottom corners and side edges of the back panel need to be stamped with inwardly bent flanges. The formed flanges are connected to the surface of the back panel at a negative angle, and cannot be directly removed along the opening and closing direction of the die. Therefore, the existing technology usually uses a distributed stamping method, first stamping the negative angle flanges at the corners, and then stamping the negative angle flanges on the left and right sides through another die. However, this method reduces production efficiency and increases the cost of using the die. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the current technology by proposing a stamping die for the outer panel of the back door. The technical problem to be solved by this invention is to simultaneously complete the integrated stamping of the corner and side negative angle flanges of the outer panel of the back door in a single set of dies, thereby simplifying the process, improving production efficiency, and reducing the cost of the die.

[0005] The objective of this invention can be achieved through the following technical solution: A stamping die for a back door outer panel, comprising an upper die and a lower die. The lower die has a fixedly connected punch at its top, and a sheet metal for stamping is placed on top of the punch. The upper die has a longitudinally slidably connected die at its bottom, and a pressure cavity is provided at the connection between the punch and the die. The lower die has a sliding block at its top that can slide towards the bottom center of the pressure cavity. The top surface of the sliding block is connected to the corner of the punch and the top surface of an adjacent side. The upper die has a slidably connected corner wedge and side wedge at its bottom, and the corner wedge is positioned on the pressure cavity... At the top corner of the cavity, the bottom of the angle wedge is provided with an arc-shaped corner pressure block. The angle wedge slides obliquely downward toward the top corner of the slide block, so that the corner pressure block presses the corner of the plate obliquely downward, forming a negative corner flange on the plate that wraps around the outer wall of the top corner of the slide block. The side wedge is located on the top outside of the pressure cavity. The bottom of the side wedge is provided with a side pressure block that is inclined toward one side of the pressure cavity. The side wedge slides obliquely downward toward one side of the pressure cavity, so that the side pressure block presses the edge of the plate obliquely downward near the corner, forming a negative angle side flange on the plate that wraps around the outer wall of one side of the top of the slide block.

[0006] In this design, the metal sheet used for stamping the outer panel of the back door is placed on the upper surface of the punch. When the upper die moves and closes with the lower die, the punch and die press the surface of the sheet into shape. During the downward movement of the upper die, the angle wedge moves obliquely downward toward the side closer to the pressure cavity. Through the arc-shaped corner pressure block at the bottom, the part of the sheet exposed at the pressure cavity is pressed obliquely downward, forming an inwardly bent negative corner flange at the corner. At the same time, the side wedge also moves obliquely downward toward the side closer to the pressure cavity. Through the oblique downward pressing of the side pressure block at the bottom, an inwardly bent negative angle side flange is formed on the edge of the sheet exposed at the pressure cavity. Due to the top surface of the slide block and the corner of the punch and the top surface of the adjacent side, Connected, the formed negative corner flange and negative angle side flange hook onto the top outer wall of the slide block, pushing the slide block towards the bottom center of the pressure chamber. The top surface and outer wall of the slide block can simultaneously separate from the negative corner flange and negative angle side flange, providing space for the sheet metal to be picked up vertically without affecting the sheet metal picking. In this way, the corner pressure block and the side pressure block can simultaneously press towards one side of the pressure chamber, forming a negative corner flange and a negative angle side flange at the edge of the sheet metal. The linkage of the corner pressure block and the side pressure block improves the production efficiency of the stamping die, and the side shaping of the sheet metal edge can be completed within a single die. With the cooperation of the slide block, it can also avoid affecting the sheet metal picking, reducing the use cost of the die.

[0007] In the stamping die for the outer panel of the rear door, the top of the lower die is provided with a first inclined guide plate and a second inclined guide plate fixedly connected to each other. The first inclined guide plate is located directly below the corner wedge, and its bottom is inclined towards the pressure cavity. The second inclined guide plate is located directly below the side wedge, and its bottom is also inclined towards the pressure cavity. The first and second inclined guide plates serve as guides and pushers. During the downward movement of the upper die, the first and second inclined guide plates can respectively push the corner wedge and the side wedge towards the pressure cavity, thereby achieving the downward oblique stamping of the corner wedge and the side wedge.

[0008] In the stamping die for the outer panel of the rear door, a first connecting plate is fixedly connected to the side wall of the corner wedge. The first connecting plate is perpendicular to the first inclined guide plate. The bottom of the first connecting plate is provided with an integrally connected first hook portion, which is slidably connected to the bottom of the first inclined guide plate. A second connecting plate is fixedly connected to the side wall of the side wedge. The second connecting plate is perpendicular to the second inclined guide plate. The bottom of the second connecting plate is provided with an integrally connected second hook portion, which is slidably connected to the bottom of the second inclined guide plate. After the stamping is completed inside the die, the upper die moves upward. The first hook portion can slide to hook the bottom of the first guide plate, causing the corner wedge to move obliquely upward, thus separating the corner pressure block from the negative corner flange obliquely. The second hook portion can slide to hook the bottom of the second guide plate, causing the side wedge to move obliquely upward, thus separating the side pressure block from the negative corner flange obliquely, preventing scratches on the sheet metal.

[0009] In the stamping die for the outer panel of the rear door, a cylinder is fixedly connected inside the lower die. A retractable piston rod is provided on the side of the cylinder near the pressure chamber. The piston rod is fixedly connected to the slide block. The cylinder and the piston rod are inclined downward at the end near the pressure chamber. A limiting block is fixedly connected inside the lower die. A control switch for controlling the piston rod to stop retracting is provided on the end of the limiting block near the slide block. After the piston rod pushes the slide block to move to the bottom of the pressure chamber, one side of the slide block will abut against the limiting block and trigger the control switch. The cylinder acts as a pusher, controlling the piston rod to push the slide towards the bottom center of the pressure chamber. Once the top surface and outer wall of the slide can separate from the negative corner flange and the negative corner side flange, one side of the slide will abut against the limit block, triggering the control switch to stop the cylinder from pushing the piston rod out. By setting the limit block and the control switch, the slide can be moved to a fixed position each time. The control switch can also be used to detect whether the slide has moved to the designated position, preventing the flange at the bottom of the plate from hooking onto the top of the slide and causing the problem of not being able to pick up the material.

[0010] In the stamping die for the outer panel of the aforementioned back door, the top of the slide block is provided with a locking block, and the top of the locking block is provided with an inclined guide slope. The bottom of the guide slope is inclined towards the center of the pressure cavity. The top of the upper die is provided with a fixed push block, which is located directly above the locking block. The bottom of the push block is provided with an inclined abutment slope, and the bottom of the abutment slope is inclined towards the center of the pressure cavity. During the process of the upper and lower dies closing, the push block moves vertically downward, and through the abutment slope and the guide slope, pushes the locking block away from the center of the pressure cavity, causing the slide block to move and reset. Furthermore, during the stamping process, the push block can abut against the locking block on the inside, preventing the slide block from shifting towards the pressure cavity side under pressure.

[0011] In the stamping die for the outer panel of the aforementioned back door, a fixed positive pressure block is provided at the top of the upper die. The positive pressure block is located on the side near the side pressure block. The positive pressure block can move vertically downward and stamp the edge of the sheet metal, forming a vertical positive angle side flange on the sheet metal. The positive angle side flange is connected to the negative angle side flange. The positive pressure block and the side pressure block are arranged adjacent to each other, allowing the negative angle side flange to transition into a positive angle side flange for connecting and installing the sheet metal.

[0012] In the aforementioned stamping die for the outer panel of the back door, the bottom of the upper die is provided with a slidingly connected punching wedge, and the bottom of the punching wedge is provided with several fixed drill bits. The top of the lower die is provided with a fixed third inclined guide plate, the bottom of which is inclined towards the pressure cavity. The third inclined guide plate is located directly below the punching wedge. The drill bits move obliquely downward and insert into the pressure cavity, forming mounting holes on the sheet metal. Under the push of the third sheet metal, the punching wedge moves obliquely downward, punching holes in the sheet metal through the drill bits at the bottom, forming oblique mounting holes on the sheet metal.

[0013] In the stamping die for the outer panel of the rear door, the bottom of the punch is provided with a blanking channel, which is located below the mounting hole. The lower die has several inclined blanking hoppers inside, with one end of each hopper located below the blanking channel and the other end extending to the outside of the lower die. Scrap material after punching falls into the blanking channel and then slides down through the hoppers, where it is collected and reused externally.

[0014] In the stamping die for the outer panel of the rear door, the upper die is equipped with several nitrogen springs fixedly connected inside, and the bottom of the nitrogen springs is fixedly connected to the top of the die core. The nitrogen springs can provide stable pressing, ejection, and rebound forces, preventing uneven material flow, wrinkling of the panel surface, and tearing; the force fluctuation is small, and the consistency of the finished product is far superior to that of ordinary springs.

[0015] Compared with the prior art, the present invention has the following advantages: In this solution, the corner pressure block and the side pressure block can simultaneously press towards one side of the pressure chamber, forming a negative corner flange and a negative side flange at the edge of the sheet metal. The coordinated pressing of the corner pressure block and the side pressure block improves the production efficiency of the stamping die, and the side shaping of the sheet metal edge can be completed within a single die. With the cooperation of the slide block, the sheet metal can be picked up without affecting the material, thus reducing the cost of using the die. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the upper mold of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the side wedge of the present invention; Figure 4 This is a front view cross-sectional structural diagram of the cylinder section of the present invention; Figure 5 This is a schematic diagram of the left-side cross-sectional structure of the punched wedge of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the sheet metal after stamping according to the present invention.

[0017] In the diagram, 1. Upper mold; 1a. Die core; 1b. Positive pressure block; 1c. Push block; 1c1. Abutting inclined surface; 1d. Nitrogen spring; 2. Lower mold; 2a. Punch core; 2a1. Blanking channel; 2b. First inclined guide plate; 2c. Second inclined guide plate; 2d. Third inclined guide plate; 2e. Blanking hopper; 2f. Limiting block; 2f1. Control switch; 3. Angle wedge; 3a. Angle pressure block; 3b. First connecting... 3b1, First hook part; 4, Side wedge; 4a, Side pressure block; 4b, Second connecting plate; 4b1, Second hook part; 5, Slide; 5a, Locking block; 5a1, Guide slope; 6, Pressure chamber; 7, Cylinder; 7a, Piston rod; 8, Punching wedge; 8a, Drill bit; 9, Plate; 9a, Negative angle flange; 9b, Negative angle side flange; 9c, Positive angle side flange; 9d, Mounting hole. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments. Example

[0019] like Figure 1 As shown, the stamping die for the outer panel of the back door includes an upper die 1 and a lower die 2. The upper die 1 is provided with several nitrogen springs 1d fixed inside, and the lower die 2 is provided with several obliquely arranged hoppers 2e inside, one end of which extends to the outside of the lower die 2.

[0020] like Figure 2 Combination Figure 3As shown, the lower mold 2 has a fixed punch 2a at its top, and the upper mold 1 has a longitudinally sliding die 1a at its bottom. A pressure cavity 6 is provided at the connection between the punch 2a and the die 1a. The lower mold 2 has two symmetrically arranged corner wedges 3 inside, each located at one corner of the pressure cavity 6. The corner wedges 3 are slidably connected to the upper mold 1. An arc-shaped corner pressure block 3a is provided at the bottom of each corner wedge 3. The lower mold 2 also has two symmetrically arranged side wedges 4 inside, which are connected to the upper mold 1. The mold 2 is slidably connected to the left and right sides of the pressure cavity 6. The bottom of the side wedge 4 is provided with a side pressure block 4a inclined towards one side of the pressure cavity 6. The top of the lower mold 2 is provided with a slide block 5 that can slide towards the bottom center of the pressure cavity 6. The top surface of the slide block 5 is connected to the corner of the punch 2a and the top surface of the adjacent side. The top of the lower mold 2 is provided with a first inclined guide plate 2b and a second inclined guide plate 2c fixedly connected. The first inclined guide plate 2b is located directly below the corner wedge 3, and the bottom of the first inclined guide plate 2b is inclined towards the side closer to the pressure cavity 6. The second... The inclined guide plate 2c is located directly below the side inclined wedge 4. The bottom of the second inclined guide plate 2c is inclined towards the pressure cavity 6. A first connecting plate 3b is fixedly connected to the side wall of the angled wedge 3. The first connecting plate 3b is perpendicular to the first inclined guide plate 2b. The bottom of the first connecting plate 3b is integrally connected to the first hook portion 3b1, which is slidably connected to the bottom of the first inclined guide plate 2b. A second connecting plate 4b is fixedly connected to the side wall of the side inclined wedge 4. The second connecting plate 4b is connected to the second inclined wedge 6. The guide plate 2c is perpendicular to each other. The bottom of the second connecting plate 4b is provided with an integrally connected second hook part 4b1. The second hook part 4b1 is slidably connected to the bottom of the second inclined guide plate 2c. The top two sides of the slide block 5 are provided with locking blocks 5a. The top surface of the locking block 5a near the center of the pressure cavity 6 is provided with a guide slope 5a1. The bottom of the guide slope 5a1 is inclined towards the side near the center of the pressure cavity 6. The top of the upper mold 1 is provided with a fixed positive pressure block 1b. The positive pressure block 1b is located on the side near the side pressure block 4a.

[0021] like Figure 3 As shown, the top of the upper mold 1 is provided with a fixed push block 1c, which is located directly above the locking block 5a. The bottom of the push block 1c is provided with an inclined abutment surface 1c1, which is inclined towards the center of the pressure cavity 6. The lower mold 2 is provided with a fixed limiting block 2f. The end of the limiting block 2f near the slide 5 is provided with a control switch 2f1 for controlling the piston rod 7a to stop extending and retracting. After the piston rod 7a pushes the slide 5 to move towards the bottom of the pressure cavity 6, one side of the slide 5 will abut against the limiting block 2f and trigger the control switch 2f1. The bottom of the nitrogen spring 1d is fixedly connected to the top of the die core 1a.

[0022] like Figure 4As shown, the lower mold 2 is equipped with a cylinder 7 fixed inside. The cylinder 7 is equipped with a retractable piston rod 7a on the side near the pressure chamber 6. The piston rod 7a is fixed to the slide block 5. The cylinder 7 and the piston rod 7a are inclined downward at the end near the pressure chamber 6.

[0023] like Figure 5 As shown, the bottom of the upper die 1 is provided with a slidingly connected punching wedge 8, and the bottom of the punching wedge 8 is provided with several fixed drill bits 8a. The top of the lower die 2 is provided with a fixed third inclined guide plate 2d. The bottom of the third inclined guide plate 2d is inclined towards the side close to the pressure cavity 6. The third inclined guide plate 2d is located directly below the punching wedge 8. The drill bits 8a move obliquely downward and are inserted into the pressure cavity 6. The bottom of the punch core 2a is provided with a material discharge channel 2a1, and one end of the material discharge hopper 2e is located below the material discharge channel 2a1.

[0024] like Figure 6 As shown, plate 9 is stamped inside pressure cavity 6. The corner pressure block 3a presses the corner of plate 9 at an angle downward, forming a negative corner flange 9a on plate 9 that wraps around the outer wall of the top corner of slide 5. The side pressure block 4a presses one side edge of plate 9 at an angle downward, forming a negative angle side flange 9b on plate 9 that wraps around the outer wall of the top side of slide 5. The positive pressure block 1b can move vertically downward and press the edge of plate 9, forming a vertical positive angle side flange 9c on plate 9. The positive angle side flange 9c is connected to the negative angle side flange 9b. The top of plate 9 is provided with mounting hole 9d.

[0025] The working principle of this solution is as follows: Figure 1-6 As shown, the metal sheet 9 to be stamped is placed above the punch 2a. When the upper die 1 moves and closes with the lower die 2, the punch 2a and the die 1a stamp the surface of the sheet 9. During the downward movement of the upper die 1, the angle wedge 3, under the pushing action of the first inclined guide plate 2b, will move obliquely downward towards the side closer to the pressure cavity 6. Through the arc-shaped corner pressure block 3a at the bottom, the part of the sheet 9 exposed in the pressure cavity 6 is pressed obliquely downward, so that an inwardly bent negative corner flange 9a is formed on the corner. At the same time, the side wedge 4, under the pushing action of the second inclined guide plate 2c, The plate 9 also moves obliquely downward towards the side of the pressure chamber 6, and is punched obliquely downward by the side pressure block 4a at the bottom, so that the negative angle side flange 9b is formed on the edge of the plate 9 exposed in the pressure chamber 6. The positive pressure block 1b at the bottom of the lower die 2 punches the edge of the plate 9, so that the vertical positive angle side flange 9c is formed on the plate 9. The positive angle side flange 9c is connected to the negative angle side flange 9b. Under the push of the third plate 9, the punching wedge 8 moves obliquely downward, and punches the plate 9 through the bottom drill bit 8a, forming an oblique mounting hole 9d on the plate 9.

[0026] After stamping, the upper die 1 moves upward, and the first hook part 3b1 can slide to hook the bottom of the first guide plate, causing the corner wedge 3 to move obliquely upward, so that the corner pressure block 3a separates obliquely from the negative corner flange 9a. The second hook part 4b1 can slide to hook the bottom of the second guide plate, so that the side wedge 4 moves obliquely upward, so that the side pressure block 4a separates obliquely from the negative corner side flange 9b, avoiding scratches on the sheet metal 9. Since the top surface of the slide block 5 is connected to the corner of the punch 2a and the top surface of the adjacent side, the formed negative corner flange 9a and negative corner side flange 9b are hooked on the top outer wall of the slide block 5. The cylinder 7 controls the piston rod 7a to push out, which can push the slide block 5 closer to the center bottom of the pressure chamber 6. The top surface and outer wall of the slide block 5 can be separated from the negative corner flange 9a and negative corner side flange 9b at the same time, providing space for the sheet metal 9 to be picked up vertically, without affecting the picking up of the sheet metal 9.

[0027] The corner pressure block 3a and the side pressure block 4a can simultaneously press towards one side of the pressure chamber 6, forming a negative corner flange 9a and a negative corner side flange 9b at the edge of the sheet metal 9. The coordinated pressing of the corner pressure block 3a and the side pressure block 4a improves the production efficiency of the stamping die, and the side shaping of the edge of the sheet metal 9 can be completed inside a single die. With the cooperation of the slide block 5, the material taking out of the sheet metal 9 can be unaffected, reducing the cost of using the die.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0029] Although this article uses many terms, such as 1. upper mold; 1a. die core; 1b. positive pressure block; 1c. push block; 1c1. abutting inclined surface; 1d. nitrogen spring; 2. lower mold; 2a. punch core; 2a1. blanking channel; 2b. first inclined guide plate; 2c. second inclined guide plate; 2d. third inclined guide plate; 2e. blanking hopper; 2f. limit block; 2f1. control switch; 3. angle wedge; 3a. angle pressure block; 3b. first connecting plate; 3b1. The terms used include: 1. First hook portion; 4. Side wedge; 4a. Side pressure block; 4b. Second connecting plate; 4b1. Second hook portion; 5. Slide seat; 5a. Locking block; 5a1. Guide slope; 6. Pressure chamber; 7. Cylinder; 7a. Piston rod; 8. Punching wedge; 8a. Drill bit; 9. Plate; 9a. Negative angle flange; 9b. Negative angle side flange; 9c. Positive angle side flange; 9d. Mounting hole, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. A stamping die for a back door outer panel, comprising an upper die (1) and a lower die (2), wherein the lower die (2) has a fixedly connected punch (2a) at its top, and a sheet metal (9) for stamping is placed on the top of the punch (2a); the upper die (1) has a longitudinally slidingly connected die (1a) at its bottom, and a pressure cavity (6) is provided at the connection between the punch (2a) and the die (1a); characterized in that, The lower die (2) is provided with a slide block (5) at the top that can slide toward the bottom center of the pressure cavity (6). The top surface of the slide block (5) is connected to the corner of the punch (2a) and the top surface of the adjacent side. The upper die (1) is provided with a slidingly connected corner wedge (3) and a side wedge (4) at the bottom. The corner wedge (3) is located at the top corner of the pressure cavity (6). The bottom of the corner wedge (3) is provided with an arc-shaped corner pressure block (3a). The corner wedge (3) slides obliquely downward toward the top corner of the slide block (5), so that the corner pressure block (3a) presses obliquely downward. The corner of the plate (9) forms a negative corner flange (9a) on the plate (9) that wraps around the outer wall of the top corner of the slide (5). The side wedge (4) is located on the top outer side of the pressure cavity (6). The bottom of the side wedge (4) is provided with a side pressure block (4a) that is inclined towards the side of the pressure cavity (6). The side wedge (4) slides obliquely downward towards the side of the pressure cavity (6), so that the side pressure block (4a) presses obliquely downward against one side edge of the plate (9) near the corner, forming a negative corner side flange (9b) on the plate (9) that wraps around the outer wall of the top side of the slide (5).

2. The stamping die for the outer panel of a back door according to claim 1, characterized in that, The lower mold (2) is provided with a first inclined guide plate (2b) and a second inclined guide plate (2c) fixedly connected to the top. The first inclined guide plate (2b) is located directly below the corner wedge (3), and the bottom of the first inclined guide plate (2b) is inclined towards the side closer to the pressure cavity (6). The second inclined guide plate (2c) is located directly below the side wedge (4), and the bottom of the second inclined guide plate (2c) is inclined towards the side closer to the pressure cavity (6).

3. The stamping die for the outer panel of a back door according to claim 2, characterized in that, The side wall of the angled wedge (3) is provided with a first connecting plate (3b) fixedly connected to the first inclined guide plate (2b). The first connecting plate (3b) is perpendicular to the first inclined guide plate (2b). The bottom of the first connecting plate (3b) is provided with an integrally connected first hook part (3b1). The first hook part (3b1) is slidably connected to the bottom of the first inclined guide plate (2b). The side wall of the side wedge (4) is provided with a second connecting plate (4b) fixedly connected to the second inclined guide plate (2c). The second connecting plate (4b) is perpendicular to the second inclined guide plate (2c). The bottom of the second connecting plate (4b) is provided with an integrally connected second hook part (4b1). The second hook part (4b1) is slidably connected to the bottom of the second inclined guide plate (2c).

4. The stamping die for the outer panel of a back door according to claim 1, characterized in that, The lower mold (2) is equipped with a cylinder (7) fixed inside. The cylinder (7) is equipped with a retractable piston rod (7a) on the side near the pressure chamber (6). The piston rod (7a) is fixed to the slide (5). The cylinder (7) and the piston rod (7a) are inclined downward at the end near the pressure chamber (6). The lower mold (2) is equipped with a limiting block (2f) fixed inside. The limiting block (2f) is equipped with a control switch (2f1) for controlling the piston rod (7a) to stop retracting. After the piston rod (7a) pushes the slide (5) to move to the bottom of the pressure chamber (6), one side of the slide (5) will abut against the limiting block (2f) and trigger the control switch (2f1).

5. The stamping die for a rear door outer panel according to claim 4, characterized in that, The top of the slide block (5) is provided with a locking block (5a), the top of the locking block (5a) is provided with an inclined guide slope (5a1), the bottom of the guide slope (5a1) is inclined towards the center of the pressure cavity (6), the top of the upper mold (1) is provided with a fixed push block (1c), the push block (1c) is located directly above the locking block (5a), the bottom of the push block (1c) is provided with an inclined abutment slope (1c1), the bottom of the abutment slope (1c1) is inclined towards the center of the pressure cavity (6).

6. The stamping die for a back door outer panel according to claim 1, characterized in that, The upper mold (1) is provided with a fixed positive pressure block (1b) at the top. The positive pressure block (1b) is located on the side close to the side pressure block (4a). The positive pressure block (1b) can move vertically downward and press the edge of the plate (9) to form a vertical positive angle side flange (9c) on the plate (9). The positive angle side flange (9c) is connected to the negative angle side flange (9b).

7. The stamping die for a rear door outer panel according to claim 1, characterized in that, The upper mold (1) has a slidingly connected punching wedge (8) at its bottom. The bottom of the punching wedge (8) has several fixed drill bits (8a). The top of the lower mold (2) has a fixed third inclined guide plate (2d). The bottom of the third inclined guide plate (2d) is inclined towards the side close to the pressure cavity (6). The third inclined guide plate (2d) is located directly below the punching wedge (8). The drill bits (8a) move obliquely downward and insert into the pressure cavity (6), so that mounting holes (9d) are formed on the plate (9).

8. The stamping die for a rear door outer panel according to claim 7, characterized in that, The bottom of the punch (2a) is provided with a material discharge channel (2a1), which is located below the mounting hole (9d). The lower die (2) is provided with several obliquely arranged material discharge hoppers (2e). One end of the material discharge hopper (2e) is located below the material discharge channel (2a1), and the other end extends to the outside of the lower die (2).

9. The stamping die for a rear door outer panel according to claim 1, characterized in that, The upper mold (1) is provided with several nitrogen springs (1d) fixed inside, and the bottom of the nitrogen springs (1d) is fixed to the top of the die core (1a).

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