A 90-degree upturned edge springback control structure for an automobile rear floor

Abstract

The utility model belongs to mould technical field, especially point to a kind of automobile rear floor 90 ° upper edge springback control structure, including upper die holder and lower die holder, upper die holder is installed with upper pressing core, lower die holder is installed with lower pressing plate, the driving force of upper pressing core downward movement is greater than the driving force of lower pressing plate upward movement, lower die holder is installed with cutter block seat, cutter block seat is equipped with cutter block in the side close to lower pressing plate, the side surface of cutter block close to lower pressing plate is pressing inclined plane one, the side surface of upper pressing core close to cutter block is pressing inclined plane two, cutter block seat is equipped with thrust inclined plane one in the side away from lower pressing plate, upper die holder is equipped with thrust inclined plane two, when lower pressing plate is down to position, workpiece side edge is formed after upper edge side edge is turned up, upper die holder continues to move down, cutter block seat moves to lower pressing plate side under the action of thrust inclined plane one and thrust inclined plane two. The utility model adopts a set of mould, one procedure, and the mould cost is low, the product inventory is low, occupies less warehousing space, and production efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically referring to a 90° upward-flipping and springback control structure for the rear floor of an automobile. Background Technology

[0002] Rear floor of a car, such as Figure 1 As shown, one side of the sheet metal is flipped up 90° to form an upturned side edge. Because the sheet metal will spring back after being flipped up, two sets of molds are typically used: one set of molds completes the side edge flipping, and the other set pushes the springbacked edge inward into place. Using two sets of molds and two processes results in high mold costs, high work-in-process inventory, large storage space requirements, and low production efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a 90° upward-flipping and spring-back control structure for the rear floor of an automobile. It adopts a set of molds and one process, resulting in low mold costs, low work-in-process inventory, less storage space, and high production efficiency.

[0004] This utility model is implemented as follows: A 90° upward-flanged springback control structure for a car rear floor includes an upper mold base and a lower mold base. An upper pressure core is mounted on the upper mold base, and a lower pressure plate, which cooperates with the upper pressure core to clamp the workpiece, is mounted on the lower mold base. An elastic element (first type) is provided between the upper mold base and the upper pressure core, causing the upper pressure core to move downwards. An elastic element (second type) is provided between the lower mold base and the lower pressure plate, causing the lower pressure plate to move upwards. During the downward movement of the upper mold base, the driving force for the downward movement of the upper pressure core is greater than the driving force for the upward movement of the lower pressure plate. A lateral sliding cutter block seat is mounted on the lower mold base. A cutter block is located on the side of the cutter block seat near the lower pressure plate, and the side of the cutter block near the lower pressure plate is formed by… The upper pressure plate has a pressure slope that gradually slopes downwards towards the lower pressure plate. The side of the upper pressure core near the blade block is a pressure slope that matches the pressure slope. The side of the blade block seat away from the lower pressure plate has a thrust slope that gradually slopes upwards towards the blade block. The upper die seat has a thrust slope that matches the thrust slope. When the lower pressure plate moves down to its position and the workpiece side flips up to form an upturned side, the upper die seat continues to move down. The thrust slope and the thrust slope come into contact. Under the action of the thrust slope and the thrust slope, the blade block seat moves towards the lower pressure plate until the pressure slopes of the lower pressure plate and the pressure slopes of the lower pressure plate press together the upturned side.

[0005] In the aforementioned 90° upward-flipping spring-back control structure for the rear floor of a car, the blade block is fixedly mounted on the blade block seat by screws.

[0006] In the above-mentioned 90° upward flipping and rebound control structure for the rear floor of an automobile, an inclined plate is installed on the side of the cutter block seat away from the lower pressure plate, and the thrust inclined surface is the upper surface of the inclined plate.

[0007] In the aforementioned 90° upward-flipping spring-back control structure for the rear floor of a car, the inclined plate is fixedly mounted on the blade block seat by screws.

[0008] In the above-mentioned 90° upward flipping and rebound control structure of the rear floor of a car, an elastic element three is provided between the lower mold base and the cutter block base, which causes the cutter block base to move away from the lower pressure plate. A limiting block one is provided on the side of the cutter block base away from the lower pressure plate, and a limiting block two is provided on the upper mold base to abut against the limiting block one and limit it.

[0009] In the above-mentioned 90° upward-flipping rebound control structure of the rear floor of a car, the elastic element three is a nitrogen cylinder or a metal coil spring.

[0010] In the above-mentioned control structure for the 90° upward flange rebound of the rear floor of an automobile, the first limiting block is fixedly installed on the cutter block seat by screws, and the second limiting block is fixedly installed on the upper mold seat by screws.

[0011] In the aforementioned 90° upward-flipping and springback control structure for a car rear floor, the side of the limiting block one away from the cutting block includes a pushing inclined surface one and a vertically arranged plane one. The pushing inclined surface one is an inclined surface that gradually slopes towards the cutting block from bottom to top, and the pushing inclined surface one is located above the plane one. The side of the limiting block two near the limiting block one includes a pushing inclined surface two that matches the pushing inclined surface one and a plane two that matches the plane one. During the downward movement of the upper mold base, when the pushing inclined surface two contacts the pushing inclined surface one, the limiting block two pushes the limiting block one to move towards the side closer to the lower pressure plate; when the plane two contacts the plane one, the limiting block two restricts the limiting block one from moving away from the lower pressure plate.

[0012] In the above-mentioned 90° upward flange rebound control structure for the rear floor of an automobile, the lower mold base is provided with a pressure plate for pressing against the side of the cutter block base.

[0013] In the above-mentioned 90° upward-flipping spring-back control structure for the rear floor of a car, four pressure plates are provided, two of which are located on the front side of the cutter block seat and two of which are located on the rear side of the cutter block seat.

[0014] In the above-mentioned 90° upward flange rebound control structure for the rear floor of an automobile, the upper mold base is provided with a limiting post, and the upper pressing core is provided with a limiting groove. When the limiting post abuts against the upper wall of the limiting groove, the upper pressing core is limited to move downward away from the upper mold base.

[0015] In the aforementioned 90° upward-flipping and springback control structure for a car rear floor, a connecting screw is installed on the lower mold base. A sleeve is fitted over the shank of the connecting screw. A limiting flange is provided at the upper end of the sleeve. An installation hole is provided on the lower pressure plate. The sleeve is slidably disposed in the installation hole. The installation hole includes a large hole and a small hole arranged coaxially, with the large hole located above the small hole. The lower end of the connecting screw passes through the installation hole and is screwed to the lower mold base. The sleeve is limited between the head of the connecting screw and the lower mold base. When the limiting flange abuts against the lower end face of the large hole, the limiting lower pressure plate moves away from the lower mold base.

[0016] In the above-mentioned 90° upward-flipping rebound control structure for the rear floor of a car, the first elastic element and the second elastic element can be nitrogen cylinders, and the initial force of the first elastic element is greater than the final force of the second elastic element.

[0017] In the above-mentioned 90° upward-flipping rebound control structure of the rear floor of a car, the first elastic element and the second elastic element can also be metal helical springs, and the spring stiffness of the first elastic element is greater than that of the second elastic element.

[0018] The outstanding advantages of this utility model compared to the prior art are: This invention features an elastic element between the upper die base and the upper pressure core, allowing the upper pressure core to move downwards. This ensures that even after the upper pressure core and lower pressure plate have moved into position, the upper die base can still move downwards. Simultaneously, a cutting block holder is slidably mounted laterally on the lower die base. On the side of the cutting block holder away from the lower pressure plate, a first thrusting slope gradually inclines from bottom to top towards the cutting block. The upper die base has a second thrusting slope adapted to the first thrusting slope. Furthermore, the side of the cutting block closest to the lower pressure plate is designed as a pressure slope gradually inclines from bottom to top towards the lower pressure plate. First, the side of the upper pressure core near the cutter is designed as a second pressure slope that matches the first pressure slope. After the lower pressure plate moves down into place and the side of the workpiece flips up to form an upward-flipped side, the upper mold base continues to move down. Under the action of the first and second pressure slopes, the cutter block moves to the side of the lower pressure plate, so that the angle between the upward-flipped side and the workpiece is less than 90°. That is, after the upward-flipped side is formed on the workpiece, the cutter block then pushes sideways. Using one set of molds and one process, the mold cost is low, the work-in-process inventory is low, the storage space occupied is small, and the production efficiency is high. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the rear floor of a car after the edge of the model has been flipped up.

[0020] Figure 2 This is a perspective view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the blade block of this utility model when it is pushed into place.

[0022] Figure 4This is a cross-sectional view of the blade block of this utility model when it is not pushed to the side.

[0023] Figure 5 This is a cross-sectional view of the lower pressure plate of this utility model when it has not moved down.

[0024] Figure 6 This is a perspective view of the upper mold base of this utility model.

[0025] Figure 7 This is a perspective view of the utility model without an upper mold base.

[0026] Figure 8 This is a cross-sectional view of the lower mold base, lower pressure plate, connecting screws, and sleeve of this utility model.

[0027] Reference numerals in the attached diagram: 1. Upper mold base; 2. Lower mold base; 3. Upper pressure core; 4. Lower pressure plate; 5. Cutter block holder; 6. Cutter block; 7. Pressure inclined surface one; 8. Pressure inclined surface two; 9. Thrust inclined surface one; 10. Thrust inclined surface two; 11. Inclined plate; 12. Limiting block one; 13. Limiting block two; 14. Pushing inclined surface one; 15. Plane one; 16. Pushing inclined surface two; 17. Plane two; 18. Pressure plate; 19. Limiting post; 20. Limiting groove; 21. Connecting screw; 22. Sleeve; 23. Limiting flange; 24. Mounting hole; 25. Workpiece; 26. Upward-facing side. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —8: A 90° upward-flipping springback control structure for a car rear floor includes an upper mold base 1 and a lower mold base 2. An upper pressure core 3 is mounted on the upper mold base 1, and a lower pressure plate 4, which cooperates with the upper pressure core 3 to clamp a workpiece 25, is mounted on the lower mold base 2. An elastic element 1, which causes the upper pressure core 3 to move downwards, is provided between the upper mold base 1 and the upper pressure core 3. An elastic element 2, which causes the lower pressure plate 4 to move upwards, is provided between the lower mold base 2 and the lower pressure plate 4. During the downward movement of the upper mold base 1, the driving force for the downward movement of the upper pressure core 3 is greater than the driving force for the upward movement of the lower pressure plate 4. A blade block seat 5, which slides laterally, is mounted on the lower mold base 2. A blade block 6 is provided on the side of the blade block seat 5 near the lower pressure plate 4, and the side of the blade block 6 near the lower pressure plate 4 is arranged from bottom to top... A pressure slope 7 gradually tilts towards the lower pressure plate 4. The side of the upper pressure core 3 near the blade block 6 is a pressure slope 8 that matches the pressure slope 7. The side of the blade block seat 5 away from the lower pressure plate 4 is provided with a thrust slope 9 that gradually tilts towards the blade block 6 from bottom to top. The upper mold base 1 is provided with a thrust slope 10 that matches the thrust slope 9. When the lower pressure plate 4 moves down to its position and the side of the workpiece 25 flips up to form the flipped side 26, the upper mold base 1 continues to move down. The thrust slope 9 and the thrust slope 10 come into contact. Under the action of the thrust slope 9 and the thrust slope 10, the blade block seat 5 moves towards the lower pressure plate 4 until the pressure slope 7 and the pressure slope 8 of the lower pressure plate 4 press together to press the flipped side 26.

[0029] During the downward movement of the upper mold base 1, the driving force for the downward movement of the upper pressure core 3 is the sum of the thrust from the elastic element 1 and the gravity of the upper pressure core 3; the driving force for the upward movement of the lower pressure plate 4 is the difference between the thrust from the elastic element 2 and the gravity of the lower pressure plate 4.

[0030] The working principle of this utility model is as follows: Figure 1-8 As shown, the workpiece 25 to be flipped is placed on the lower pressure plate 4. The upper mold base 1 moves downward, causing the upper pressure core 3 to move downward until the upper pressure core 3 presses onto the workpiece 25. Figure 5 As shown; Continuing to move the upper mold base 1 downwards, since the driving force of the upper pressure core 3 moving downwards is greater than the driving force of the lower pressure plate 4 moving upwards, the upper pressure core 3 pushes the lower pressure plate 4 downwards, and the elastic element 2 undergoes elastic deformation until the lower pressure plate 4 moves into place, and the side of the workpiece 25 flips up to form the flipped side 26, as shown. Figure 4As shown, during this process, the second thrust ramp 10 is located above the first thrust ramp 9, and the second thrust ramp 10 does not contact the first thrust ramp 9; the upper die holder 1 continues to move downward, the upper pressure core 3 remains stationary, the elastic element 1 undergoes elastic deformation, the first thrust ramp 9 contacts the second thrust ramp 10, and the cutter block holder 5 moves to the side of the lower pressure plate 4 under the action of the first thrust ramp 9 and the second thrust ramp 10, until the pressure ramp 7 and the pressure ramp 8 of the lower pressure plate 4 jointly press the upward-turned side 26. Since the first pressure ramp is a ramp that gradually slopes downward to the side of the lower pressure plate 4 from bottom to top, the angle between the upward-turned side 26 and the workpiece 25 is less than 90°. Figure 3 As shown, after the tool block 6 retracts, the upper flange side 26 will spring back outward, making the angle between the upper flange side 26 and the workpiece 25 90°.

[0031] This invention features an elastic element between the upper die base 1 and the upper pressure core 3, which allows the upper pressure core 3 to move downwards. This ensures that even after the upper pressure core 3 and the lower pressure plate 4 have moved to their positions, the upper die base 1 can still move downwards. Simultaneously, a cutting block seat 5 is slidably mounted laterally on the lower die base 2. On the side of the cutting block seat 5 away from the lower pressure plate 4, a thrusting inclined surface 9 is provided, gradually tilting upwards towards the cutting block 6. The upper die base 1 has a second thrusting inclined surface 10 adapted to the thrusting inclined surface 9. Furthermore, the side of the cutting block 6 closest to the lower pressure plate 4 is designed as a pressure inclined surface 7, gradually tilting downwards towards the lower pressure plate 4. The upper pressure core 3 is designed with a pressure slope 2 8 that matches the pressure slope 1 7. After the lower pressure plate 4 moves down into place and the side of the workpiece 25 flips up to form the flipped side 26, the upper mold base 1 continues to move down. The cutter block base 5 moves to the side of the lower pressure plate 4 under the action of the thrust slope 1 9 and the thrust slope 2 10, so that the angle between the flipped side 26 and the workpiece 25 is less than 90°. That is, after the flipped side 26 is formed on the workpiece 25, the cutter block 6 then pushes to the side. One set of molds and one process are used, the mold cost is low, the work-in-process inventory is low, the storage space occupied is small, and the production efficiency is high.

[0032] Installation structure of blade block 6: Blade block 6 is fixedly installed on blade block seat 5 by screws.

[0033] To improve the service life of the mold, an inclined plate 11 is installed on the side of the cutter block 5 away from the lower pressure plate 4, and the thrust inclined surface 9 is the upper surface of the inclined plate 11. When the thrust inclined surface 9 wears out, a new inclined plate 11 can be replaced.

[0034] Installation structure of inclined plate 11: The inclined plate 11 is fixedly installed on the blade block seat 5 by screws.

[0035] To facilitate the outward reset of the cutting block 6 and to prevent it from moving away from the lower pressure plate 4 during the downward movement of the upper die holder 1, thus affecting the formation of the upward-turned side 26, an elastic element three is provided between the lower die holder 2 and the cutting block holder 5. This elasticity allows the cutting block holder 5 to move away from the lower pressure plate 4. A limiting block one 12 is provided on the side of the cutting block holder 5 away from the lower pressure plate 4, and a limiting block two 13 is provided on the upper die holder 1 to abut against and limit the limiting block one 12. During the upward movement of the upper die holder 1, the cutting block holder 5 moves away from the lower pressure plate 4 under the action of the elastic element three.

[0036] Preferably, the third elastic element is a nitrogen cylinder or a metal coil spring. In this embodiment, the third elastic element is a nitrogen cylinder.

[0037] Installation structure of limit block 12 and limit block 23: Limit block 12 is fixedly installed on the cutter block seat 5 by screws, and limit block 23 is fixedly installed on the upper mold seat 1 by screws.

[0038] Furthermore, the side of the limiting block 12 away from the cutting block 6 includes a pushing inclined surface 14 and a vertically arranged plane 15. The pushing inclined surface 14 is an inclined surface that gradually slopes towards the cutting block 6 from bottom to top, and the pushing inclined surface 14 is located above the plane 15. The side of the limiting block 13 near the limiting block 12 includes a pushing inclined surface 16 adapted to the pushing inclined surface 14 and a plane 17 adapted to the plane 15. During the downward movement of the upper mold base 1, when the pushing inclined surface 16 contacts the pushing inclined surface 14, the limiting block 13 pushes the limiting block 12 to move towards the side closer to the lower pressure plate 4; when the plane 17 contacts the plane 15, the limiting block 13 restricts the limiting block 12 from moving away from the lower pressure plate 4.

[0039] After the upper die holder 1 moves up a certain distance, the second pushing inclined surface 16 contacts the first pushing inclined surface 14. At this time, the upper die holder 1 continues to move up, and the cutter block holder 5 moves away from the lower pressure plate 4 under the action of the elastic element 3.

[0040] During the downward movement of the upper mold base 1, when the second pushing inclined surface 16 contacts the first pushing inclined surface 14, the second limiting block 13 pushes the first limiting block 12 to move closer to the lower pressure plate 4. Then, as the upper mold base 1 continues to move downward, the second plane 17 contacts the first plane 15, and the second limiting block 13 restricts the first limiting block 12 from moving away from the lower pressure plate 4. Figure 5 As shown, until the upper pressure core 3 and the lower pressure plate 4 move into place (as shown). Figure 4 (As shown) After that, the cutter block holder 5 moves to the side of the downward pressure plate 4 under the action of the first thrust inclined plane 9 and the second thrust inclined plane 10. At this time, there is a gap between the second plane 17 and the first plane 15, as shown. Figure 3 As shown.

[0041] In order to restrict the vertical movement of the cutter block holder 5, the lower mold base 2 is provided with a pressure plate 18 for pressing on the side of the cutter block holder 5.

[0042] Furthermore, four pressure plates 18 are provided, two of which are located on the front side of the blade block holder 5 and two of which are located on the rear side of the blade block holder 5.

[0043] In order to guide the lateral movement of the cutter block holder 5, the lower mold base 2 is provided with a lateral guide rail, and the cutter block holder 5 slides on the lateral guide rail.

[0044] To prevent the upper pressure core 3 from moving downwards and detaching from the upper mold base 1, such as Figure 1 , 7 As shown, the upper mold base 1 is provided with a limiting post 19, and the upper pressing core 3 is provided with a limiting groove 20. When the limiting post 19 abuts against the upper wall of the limiting groove 20, the upper pressing core 3 is limited to move down away from the upper mold base 1.

[0045] To prevent the lower pressure plate 4 from moving upwards and detaching from the lower die holder 2, such as Figure 8 As shown, a connecting screw 21 is installed on the lower mold base 2. A sleeve 22 is fitted over the shank of the connecting screw 21. A limiting flange 23 is provided at the upper end of the sleeve 22. An installation hole 24 is provided on the lower pressure plate 4. The sleeve 22 is slidably disposed in the installation hole 24. The installation hole 24 includes a large hole and a small hole arranged coaxially, with the large hole located above the small hole. The lower end of the connecting screw 21 passes through the installation hole 24 and is screwed to the lower mold base 2. The sleeve 22 is limited between the head of the connecting screw 21 and the lower mold base 2. When the limiting flange 23 abuts against the lower end face of the large hole, the lower pressure plate 4 is limited to move upward away from the lower mold base 2.

[0046] Furthermore, both the first elastic element and the second elastic element are nitrogen cylinders, and the initial force of the first elastic element is greater than the final force of the second elastic element.

[0047] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A 90° upward-flipping rebound control structure for the rear floor of an automobile, characterized in that: The assembly includes an upper die base (1) and a lower die base (2). An upper pressure core (3) is mounted on the upper die base (1), and a lower pressure plate (4) is mounted on the lower die base (2) to clamp the workpiece (25) in cooperation with the upper pressure core (3). An elastic element 1 is provided between the upper die base (1) and the upper pressure core (3) to cause the upper pressure core (3) to move downward. An elastic element 2 is provided between the lower die base (2) and the lower pressure plate (4) to cause the lower pressure plate (4) to move upward. During the downward movement of the upper die base (1), the driving force for the downward movement of the upper pressure core (3) is greater than the driving force for the upward movement of the lower pressure plate (4). A tool block seat (5) that slides laterally is mounted on the lower die base (2). A tool block (6) is provided on the side of the tool block seat (5) near the lower pressure plate (4). The side of the tool block (6) near the lower pressure plate (4) is inclined from bottom to top towards the lower pressure plate (4). The pressure slope one (7), the side of the upper pressure core (3) near the blade block (6) is the pressure slope two (8) adapted to the pressure slope one (7), the side of the blade block seat (5) away from the lower pressure plate (4) is provided with a thrust slope one (9) that gradually slopes from bottom to top toward the blade block (6), the upper mold seat (1) is provided with a thrust slope two (10) adapted to the thrust slope one (9), the lower pressure plate (4) After the workpiece (25) moves down to the position and the side of the workpiece (25) flips up to form the flipped side (26), the upper mold base (1) continues to move down. The first thrust slope (9) contacts the second thrust slope (10), and the cutter block base (5) moves to the side of the lower pressure plate (4) under the action of the first thrust slope (9) and the second thrust slope (10) until the first pressure slope (7) and the second pressure slope (8) of the lower pressure plate (4) press together to press the flipped side (26).

2. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: The blade block seat (5) is inclined with a sloping plate (11) on the side away from the lower pressure plate (4), and the thrust inclined surface (9) is the upper surface of the sloping plate (11).

3. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: The lower die holder (2) and the cutter block holder (5) are provided with an elastic element three that allows the cutter block holder (5) to move away from the lower pressure plate (4). The cutter block holder (5) is provided with a limiting block one (12) on the side away from the lower pressure plate (4). The upper die holder (1) is provided with a limiting block two (13) that abuts against the limiting block one (12) for limiting.

4. The 90° upward-flipping rebound control structure for the rear floor of an automobile according to claim 3, characterized in that: The side of the limiting block one (12) away from the blade block (6) includes a pushing inclined surface one (14) and a vertically arranged plane one (15). The pushing inclined surface one (14) is an inclined surface that gradually slopes towards the blade block (6) from bottom to top, and the pushing inclined surface one (14) is located above the plane one (15). The side of the limiting block two (13) near the limiting block one (12) includes a pushing inclined surface two that is adapted to the pushing inclined surface one (14). 16) and plane 2 (17) which is compatible with plane 1 (15), when the upper mold base (1) moves down, when the pushing inclined plane 2 (16) contacts the pushing inclined plane 1 (14), the limiting block 2 (13) pushes the limiting block 1 (12) to move closer to the lower pressure plate (4); when plane 2 (17) contacts plane 1 (15), the limiting block 2 (13) restricts the limiting block 1 (12) from moving away from the lower pressure plate (4).

5. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: The lower die holder (2) is provided with a pressure plate (18) for pressing on the side of the cutter block holder (5).

6. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: The upper mold base (1) is provided with a limiting post (19), and the upper pressing core (3) is provided with a limiting groove (20). When the limiting post (19) abuts against the upper wall of the limiting groove (20), the upper pressing core (3) is limited to move down away from the upper mold base (1).

7. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: A connecting screw (21) is installed on the lower mold base (2). A sleeve (22) is fitted on the shank of the connecting screw (21). A limiting flange (23) is provided on the upper end of the sleeve (22). An installation hole (24) is provided on the lower pressure plate (4). The sleeve (22) is slidably disposed in the installation hole (24). The installation hole (24) includes a large hole and a small hole arranged coaxially, with the large hole located above the small hole. The lower end of the connecting screw (21) passes through the installation hole (24) and is screwed to the lower mold base (2). The sleeve (22) is limited between the head of the connecting screw (21) and the lower mold base (2). When the limiting flange (23) abuts against the lower end face of the large hole, the lower pressure plate (4) is limited to move upward away from the lower mold base (2).

8. The 90° upward-flipping spring-back control structure for the rear floor of an automobile according to claim 1, characterized in that: Both the first elastic element and the second elastic element are nitrogen cylinders, and the initial force of the first elastic element is greater than the final force of the second elastic element.

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