An automotive interior trim panel forming device

Abstract

The present invention belongs to the technical field of hot pressing forming, and in particular relates to a forming device for automobile interior trim panels, which includes an upper mold and a lower mold. A fixed-edge middle mold that moves up and down is arranged between the upper mold and the lower mold. Two rows of spring top cloth rods are arranged in the non-forming area of the lower mold. The spring top cloth rods and the fixed-edge middle mold clamp the edge material. A top feeding cloth clamping mechanism is slidably connected to the bottom of the fixed-edge middle mold. The top feeding cloth clamping mechanism performs a cloth clamping action and a cloth feeding action according to the movement position of the fixed-edge middle mold. Taking the edge material as the jacking point, the cloth clamping and lifting are realized during the mold opening process, simplifying the mold structure and eliminating the need to consider the damage of the ejector to the material. It integrates the existing fabric positioning function and at the same time solves the problem that the edge material clamping structure hinders the feeding of the material during the continuous production and processing after the insertion cloth rod is set. The processing and discharging action is smooth, meeting the requirements of continuous processing.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot pressing forming, and particularly relates to a forming device for automobile interior trim panels. Background Art

[0002] The decorative surface of the automobile interior trim panel is prepared by hot pressing forming. The hot pressing forming die is divided into an upper die and a lower die. The surface layer is attached between the dies. The heating of the die and the attaching effect of the cavity cause the surface layer to adhere to the surface of the interior trim panel.

[0003] During the hot pressing forming process of the surface layer, the surface layer adheres to the interior trim panel and protrudes the shape of the interior trim panel. The surrounding material is the waste material. The positioning holes opened on the waste material cooperate with the positioning pins of the die to achieve fixation.

[0004] After processing, demolding is required. The waste material is useless, so it is not necessary to consider the marks left by the ejector rod on the material during the ejection process. However, the waste material is prone to deformation, so the waste material cannot be used as the ejection point for ejection. An ejection structure is arranged in the forming area of the die to eject the formed part. The shapes of the cavity and the convex die are complex. There are many factors to be considered when arranging the ejection structure in the cavity and the convex die, which increases the design difficulty and complicates the ejection structure. At the same time, the influence of the ejection structure on the surface of the plate needs to be considered. Summary of the Invention

[0005] The purpose of the present invention is to provide a forming device for automobile interior trim panels. On the basis of the existing positioning of the fabric die, the method of lifting the clamping edge is used to replace the ejection structure, and the problem that the edge material clamping structure hinders the feeding of materials during continuous production and processing after the insertion cloth rod is set is solved. The processing and discharging actions are smooth, meeting the requirements of continuous processing.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A forming device for automobile interior trim panels: including an upper die and a lower die, a fixed-edge middle die moving up and down is arranged between the upper die and the lower die. Two rows of spring cloth ejector rods are arranged in the non-forming area of the lower die. The spring cloth ejector rods and the fixed-edge middle die clamp the waste material. A top-feeding cloth clamping mechanism is slidably connected to the bottom of the fixed-edge middle die. The top-feeding cloth clamping mechanism performs the edge clamping action and the edge feeding action according to the movement position of the fixed-edge middle die.

[0007] As a further solution of the present invention: A pressing cloth rod is fixedly connected to the top surface of the spring cloth ejector rod close to the side of the top-feeding cloth clamping mechanism, and the pressing cloth rod is flush with the top surface of the spring cloth ejector rod.

[0008] As a further solution of the present invention: In the retracted state, the spring cloth ejector rod is flush with the top surface of the lower die.

[0009] As a further solution of the present invention: a cloth inserting rod is fixedly connected to the top of the spring pressing cloth rod, and a plugging hole matching with the cloth inserting rod is opened on the bottom surface of the middle die of the fixed edge.

[0010] As a further solution of the present invention: the shape of the middle die of the fixed edge is a C shape, and a groove body fitting with the middle die of the fixed edge is opened on the circumferential side of the bottom surface of the upper die.

[0011] As a further solution of the present invention: the top feeding and cloth clamping mechanism includes a horizontal sliding plate and a direction-changing roller. The horizontal sliding plate is slidably connected to the middle die of the fixed edge. The direction-changing roller is driven to rotate by a direction-changing driver. The direction-changing roller is rotatably connected to the horizontal sliding plate, and the rotation angle of the direction-changing roller is 90 degrees.

[0012] As a further solution of the present invention: there are multiple direction-changing rollers, and the multiple direction-changing rollers are linearly distributed on the top of the horizontal sliding plate.

[0013] As a further solution of the present invention: an adjustable groove body is opened on the side surface of the lower die. The adjustable groove body is composed of a groove body and a sliding block. The sliding block slides in the groove body. The sliding block is driven and controlled by any one of a cylinder, an oil cylinder, and an electric push rod. When the sliding block is in a contracted state, a sunken groove body is formed. When the sliding block is ejected, the sunken surface of the groove body is filled. A contact rod wheel is fixedly connected to the bottom surface of the horizontal sliding plate, and the contact rod wheel slides on the side wall of the lower die and the inner wall of the adjustable groove body.

[0014] As a further solution of the present invention: the horizontal sliding plate is slidably connected to the middle die of the fixed edge through a sliding mechanism, and a return spring is arranged in the sliding mechanism.

[0015] As a further solution of the present invention: the middle die of the fixed edge is elastically connected to the lower die through an attaching spring, and an open end is opened at one end of the middle die of the fixed edge.

[0016] The beneficial effects of the present invention are as follows: taking the edge material as the jacking point, the edge clamping is lifted during the mold opening process, the mold structure is simplified, and there is no need to consider the damage of the ejector pin to the material; the existing fabric positioning function is integrated, and at the same time, the problem that the edge material clamping structure hinders the feeding of the material during the continuous production and processing process after the cloth inserting rod is set is solved. The processing and discharging actions are smooth, meeting the requirements of continuous processing.

[0017] Parts not involved in the device are the same as the prior art or can be implemented by using the prior art. Description of the Drawings

[0018] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0019] Figure 2A perspective three-dimensional schematic diagram of another perspective of the present invention.

[0020] Figure 3 It is Figure 2 A perspective three-dimensional schematic diagram after the upper mold is jacked up.

[0021] Figure 4 It is Figure 3 A perspective three-dimensional schematic diagram of another perspective of

[0022] Figure 5 A schematic diagram of the mold closing process of the present invention.

[0023] Figure 6 A schematic diagram of the mold opening process of the present invention.

[0024] Figure 7 A schematic diagram of discharging materials of the present invention.

[0025] Figure 8 A schematic diagram of the spring cloth pressing rod in the present invention.

[0026] Figure 9 A schematic diagram of the position of the deflecting roller in the slider ejection and slider contraction states of the adjustable trough in the present invention.

[0027] In the figure: 1. Upper mold; 2. Fixed-side middle mold; 21. Attaching spring; 22. Open end; 23. Insertion hole; 24. Sliding mechanism; 3. Lower mold; 31. Adjustable trough; 32. Spring cloth pressing rod; 321. Cloth inserting rod; 322. Cloth pressing rod; 4. Top feeding and cloth clamping mechanism; 41. Horizontal slide plate; 42. Deflecting roller; 43. Deflecting driver; 44. Contact rod wheel. Specific embodiments

[0028] Please refer to Figures 1-9 , Embodiment 1: In this embodiment: It includes an upper mold 1 and a lower mold 3. A fixed-side middle mold 2 that moves up and down is arranged between the upper mold 1 and the lower mold 3. Two rows of spring cloth pressing rods 32 are arranged in the non-forming area of the lower mold 3, and the spring cloth pressing rods 32 and the fixed-side middle mold 2 clamp the edge materials.

[0029] The improvement point of this embodiment is that: A fixed-side middle mold 2 is added between the upper mold 1 and the lower mold 3, and the fixed-side middle mold 2 moves along with the movement of the upper mold 1.

[0030] The problem solved by the improvement point of this embodiment is: Using the edge material as the jacking point to solve the problem that the edge material is too soft to bear force and reduce the complexity of the mold caused by the top material in the forming area.

[0031] Improvement principle: The lower mold 3 is fixed at the bottom, and the fixed-side middle mold 2 moves along with the movement of the upper mold 1. Please refer to Figure 5, in the static state, the middle edge - fixing mold 2 does not contact the lower mold 3, and the surface layer is laid flat on the top of the lower mold 3. During the descending stage of the upper mold 1, the upper mold 1 contacts the middle edge - fixing mold 2, the middle edge - fixing mold 2 contacts the spring - topped cloth rod 32, and the edge material of the surface layer is then clamped by the middle edge - fixing mold 2 and the spring - topped cloth rod 32. As the upper mold 1 continues to descend, the middle edge - fixing mold 2 continues to descend, and the spring - topped cloth rod 32 enters the interior of the lower mold 3 under the influence of the middle edge - fixing mold 2.

[0032] Please refer to Figure 6 , after the upper mold 1 is opened, the spring (not shown) below the spring - topped cloth rod 32 undergoes elastic deformation and resets, and the middle edge - fixing mold 2 rises with the upper mold 1. The spring - topped cloth rod 32 always contacts the middle edge - fixing mold 2, and the edge layer is always clamped by the spring - topped cloth rod 32 and the middle edge - fixing mold 2.

[0033] In summary, the problem of the edge material deformation and inability to eject is solved, and the technical effects brought are as follows: during the mold - opening process, the edge clamping is realized, the mold structure is simplified, and there is no need to consider the damage to the material caused by the ejector.

[0034] The further improvement point of this embodiment is that: a cloth - inserting rod 321 is fixedly connected to the top of the spring - topped cloth rod 32, and a plug - in hole 23 matching the cloth - inserting rod 321 is opened on the bottom surface of the middle edge - fixing mold 2.

[0035] The problem solved by the improvement point of this embodiment is that: the clamping between the middle edge - fixing mold 2 and the spring - topped cloth rod 32 relies on friction, and it is difficult to clamp and eject due to the small surface friction of the fabric.

[0036] Improvement principle: Keeping the existing surface - layer positioning hole structure, a cloth - inserting rod 321 is arranged at the top of the spring - topped cloth rod 32, and the cloth - inserting rod 321 is positioned with the surface - layer positioning hole. The diameter of the cloth - inserting rod 321 is smaller than that of the spring - topped cloth rod 32, and the stepped surface formed by the spring - topped cloth rod 32 and the cloth - inserting rod 321 can lift the surface - layer positioning hole. After the cloth - inserting rod 321 is inserted and matched with the plug - in hole 23, the edge material is ensured to be stable under the dual actions of hole - limiting and clamping - limiting.

[0037] In this embodiment, the shape of the middle edge - fixing mold 2 is a U - shape, a groove body for fitting with the middle edge - fixing mold 2 is opened on the circumferential side of the bottom surface of the upper mold 1, the middle edge - fixing mold 2 and the lower mold 3 are elastically connected by an attaching spring 21, and an open end 22 is opened at one end of the middle edge - fixing mold 2.

[0038] In this embodiment, the formed workpiece will bulge upward. The advantage of the middle edge - fixing mold 2 having an open end 22 is that the clamping and conveying action of the deflecting roller 42 on the edge material enables the workpiece to be removed through the open end 22. The attaching spring 21 can ensure that the middle edge - fixing mold 2 fits tightly when contacting the upper mold 1.

[0039] Embodiment 2: Based on Embodiment 1, the following improvements are made: In this embodiment, a top feeding and cloth clamping mechanism 4 is slidably connected to the bottom of the middle die 2 for fixing the edge. The top feeding and cloth clamping mechanism 4 performs edge clamping and edge feeding actions according to the movement position of the middle die 2 for fixing the edge.

[0040] Problem to be solved: After the edge material is clamped, the material needs to be sent out of the die, and the clamping structure is not conducive to the sending out of the material, so the applicability of continuous production and processing is not good.

[0041] Improvement principle: Please refer to Figure 5 , after the upper die 1 continues to rise, the middle die 2 for fixing the edge will be separated from the spring cloth pressing rod 32. If the middle die 2 for fixing the edge is not separated from the spring cloth pressing rod 32, the edge material will always be in the clamped state of the spring cloth pressing rod 32 and the middle die 2 for fixing the edge, which is not conducive to separating from the workpiece.

[0042] Please refer to Figure 6 , after the middle die 2 for fixing the edge and the spring cloth pressing rod 32 are lifted to the critical separation state, the top feeding and cloth clamping mechanism 4 moves inward to clamp the plate. Please refer to Figure 7 , the middle die 2 for fixing the edge continues to be lifted, the middle die 2 for fixing the edge is separated from the spring cloth pressing rod 32, the top feeding and cloth clamping mechanism 4 clamps the edge material at the middle die 2 for fixing the edge, and the clamping method of the spring cloth pressing rod 32 and the middle die 2 for fixing the edge to the edge material is converted to the clamping method of the top feeding and cloth clamping mechanism 4 and the middle die 2 for fixing the edge. The top feeding and cloth clamping mechanism 4 can drive the material to be sent out by using the clamping effect of the edge material.

[0043] Technical effect: Solved the problem that the edge material clamping structure hinders the sending out of the material during continuous production and processing after the cloth pressing rod 321 is set.

[0044] In this embodiment, the implementation method of the top feeding and cloth clamping mechanism 4 is as follows: The top feeding and cloth clamping mechanism 4 includes a horizontal sliding plate 41 and a direction-changing roller 42. The horizontal sliding plate 41 is slidably connected to the middle die 2 for fixing the edge. The direction-changing roller 42 is driven to rotate by a direction-changing driver 43. The direction-changing roller 42 is rotatably connected to the horizontal sliding plate 41. The rotation angle of the direction-changing roller 42 is 90 degrees. There are multiple direction-changing rollers 42, and the multiple direction-changing rollers 42 are linearly distributed on the top of the horizontal sliding plate 41. An adjustable groove 31 is provided on the side surface of the lower die 3. The adjustable groove 31 is composed of a groove body and a slider. The slider slides in the groove body, and the slider is driven and controlled by any one of a cylinder, an oil cylinder, and an electric push rod. When the slider is in the contracted state, a concave groove body is formed. When the slider is ejected, the concave surface of the groove body is filled. A contact rod wheel 44 is fixedly connected to the bottom surface of the horizontal sliding plate 41. The contact rod wheel 44 slides on the side wall of the lower die 3 and the inner wall of the adjustable groove 31. The horizontal sliding plate 41 and the middle die 2 for fixing the edge are slidably connected through a sliding mechanism 24, and a return spring is arranged in the sliding mechanism 24.

[0045] The principle of the above implementation method is as follows: Please refer to Figure 9, the upper mold 1 is at the original starting point, the fixed edge middle mold 2 is lifted to the highest point, the fixed edge middle mold 2 is separated from the spring top cloth rod 32, and the slider of the adjustable trough 31 is in the ejected state, the concave surface of the trough is filled, the horizontal slide 41 is located away from the spring top cloth rod 32, and the spring in the sliding mechanism 24 is in an elastic deformation state. When installing the fabric, the fabric is positioned by the cloth insertion rod 321, and the top feeding and clamping mechanism 4 will not interfere with the installation of the fabric. In the pressed state, the fixed edge middle mold 2 descends, and the fabric is clamped by the fixed edge middle mold 2 and the spring top cloth rod 32; the reversing roller 42 moves to the side of the lower mold 3, and the fixed edge middle mold 2 continues to descend; in the closed mold state, the fixed edge middle mold 2, the spring top cloth rod 32, and the lower mold 3 clamp the edge material of the facing layer.

[0046] In the mold open state, please refer to Figure 6 , the slider of the adjustable trough body 31 is retracted to form a concave trough body. After the fixed edge middle mold 2 is lifted, during the period of the spring top cloth rod 32 and the fixed edge middle mold 2 clamping the edge material, the contact rod wheel 44 moves to the concave part of the adjustable trough body 31, and the contact rod wheel 44 carries the horizontal slide plate 41 to move toward the forming area. When the change-direction roller 42 moves toward the forming area, it rolls the edge material and provides vertical support force for the edge material. After the change-direction roller 42 clamps the edge material, when the fixed edge middle mold 2 and the spring top cloth rod 32 are not separated, the change-direction driver 43 drives the change-direction roller 42 to rotate 90 degrees, and the rotation axis of the change-direction roller 42 changes 90 degrees. The fixed edge middle mold 2 continues to rise, the fixed edge middle mold 2 is separated from the spring top cloth rod 32, the top feeding and clamping mechanism 4 and the fixed edge middle mold 2 continue to rise with the edge material, the cloth insertion rod 321 is separated from the edge material hole and the plug hole 23, and the change-direction roller 42 drives the edge material and the workpiece to move toward the open end 22.

[0047] Design advantages: Combined with the existing movement direction of the upper mold 1, the top feeding and clamping mechanism 4 is added to solve the separation problem of the edge material and the spring top cloth rod 32. After solving this problem, the processing and discharging action of the device is smooth, meeting the continuous processing requirements.

[0048] Further improvement of this embodiment: a cloth pressing rod 322 is fixedly connected to the top surface of the spring cloth pushing rod 32 near the cloth pushing clamping mechanism 4, and the cloth pressing rod 322 is flush with the top surface of the spring cloth pushing rod 32. The spring cloth pushing rod 32 is flush with the top surface of the lower mold 3 in the stored state.

[0049] Problem to be solved: The edge of the edge material away from the spring top cloth rod 32 is a soft edge. After the spring top cloth rod 32 lifts the edge material of the fabric, the edge material will bend downward due to the influence of gravity, and the changing roller 42 cannot press the edge material.

[0050] Solution: A cloth pressing rod 322 is fixed on the side of the top of the spring top cloth rod 32 away from the cavity. The cloth pressing rod 322 supports the edge of the fabric, and the edge of the fabric cannot bend downward. The contact rod wheel 44 moves toward the cavity to press the edge of the fabric.

[0051] Supplementary description of this embodiment: The contact rod wheel 44 is located between two adjacent fabric pressing rods 322. This distribution method enables the contact rod wheel 44 to press a larger area of the fabric edge. The deflector roller 42 at the end is a power wheel, and the power wheel can control the rotation of the wheel body in the form of external power supply with a motor.

[0052] Usage method: Step one, please refer to Figure 5 a in Figure 5 a in is the starting stage. The slider of the adjustable groove body 31 is in the ejected state, and the concave surface of the adjustable groove body 31 is closed. Affected by the ejection of the slider of the adjustable groove body 31, the contact rod wheel 44 drives the horizontal slide plate 41 to move away from the cavity, and the sliding mechanism 24 undergoes elastic deformation and contracts to store energy. There is a spacing between the fixed-edge middle mold 2 and the spring fabric pressing rod 32, and the spacing is used to install the surface layer. The hole body of the surface layer is inserted into the cloth inserting rod 321 to complete the surface installation step.

[0053] Step two, please refer to Figure 5 b in

[0054] In b, the upper mold 1 descends. The upper mold 1 contacts the fixed-edge middle mold 2, and the upper mold 1 drives the fixed-edge middle mold 2 to descend, and the attachment spring 21 undergoes elastic deformation. The fixed-edge middle mold 2 descends until it contacts the spring fabric pressing rod 32, and the cloth inserting rod 321 is inserted into the insertion hole 23. The hole body of the surface layer is cooperated with the cloth inserting rod 321 and the insertion hole 23 to achieve two functions of perforation positioning and clamping fixation. Figure 5

[0055] Step three, please refer to Figure 6 c in Figure 6 Figure 6In c: During the mold opening stage, the slider of the adjustable groove body 31 is in a contracted state, and the concave surface of the adjustable groove body 31 is formed. The upper mold 1 rises, the attaching spring 21 elastically resets and pushes the middle mold 2 with a fixed edge into contact with the upper mold 1. The spring inside the spring cloth pushing rod 32 elastically resets, the spring cloth pushing rod 32 rises, the spring cloth pushing rod 32 is relatively stationary with the middle mold 2 with a fixed edge, and the spring cloth pushing rod 32 and the attaching spring 21 keep in contact with each other and clamp and lift the edge material. The edge material is lifted and applies a force to the formed part, and the formed part is separated from the cavity or the punch. The contact rod wheel 44 enters the groove body of the adjustable groove body 31, the spring inside the sliding mechanism 24 elastically deforms, the contact rod wheel 44 carries the horizontal slide plate 41 to displace towards the cavity area, and the deflecting roller 42 rolls over the edge material below the middle mold 2 with a fixed edge, and the deflecting roller 42 and the middle mold 2 with a fixed edge form a clamping force on the edge material.

[0056] Step Five, please refer to Figure 7 in a- Figure 7 In c: The upper mold 1 continues to rise. Before the moving stroke of the spring cloth pushing rod 32 reaches the limit, the deflecting driver 43 drives the deflecting roller 42 to rotate 90 degrees, and the rotating direction of the deflecting roller 42 changes from facing the cavity direction to facing the open end 22 direction. The middle mold 2 with a fixed edge continues to rise, and the cloth inserting rod 321 separates from the inserting hole 23. The supporting force applied by the deflecting roller 42 to the edge material causes the edge material to rise, the hole body of the edge material separates from the cloth inserting rod 321, the deflecting roller 42 rotates towards the open end 22, and the deflecting roller 42 drives the edge material to move from the open end 22, and the formed part carrying the edge material is discharged through the open end 22.

[0057] Step Six: After discharging, the rotating direction of the deflecting roller 42 resets, the slider of the adjustable groove body 31 is in the ejecting state, and repeat Step One.

[0058] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A molding device for an automobile interior trim panel, comprising an upper mold (1) and a lower mold (3), characterized in that: A fixed-edge middle mold (2) that moves up and down is arranged between the upper mold (1) and the lower mold (3). Two rows of spring top cloth rods (32) are arranged in the non-forming area of the lower mold (3), and the spring top cloth rods (32) and the fixed-edge middle mold (2) clamp the edge material. A top-feed cloth clamping mechanism (4) is slidably connected to the bottom of the fixed-edge middle mold (2), and the top-feed cloth clamping mechanism (4) performs a clamping edge action and a feeding edge action according to the movement position of the fixed-edge middle mold (2). The top-feed cloth clamping mechanism (4) includes a horizontal slide plate (41) and a direction-changing roller (42). The horizontal slide plate (41) is slidably connected to the fixed-edge middle mold (2). The direction-changing roller (42) is driven to rotate by a direction-changing driver (43). The direction-changing roller (42) is rotatably connected to the horizontal slide plate (41), and the rotation angle of the direction-changing roller (42) is 90 degrees. An adjustable groove body (31) is opened on the side surface of the lower mold (3). The adjustable groove body (31) is composed of a groove body and a slider. The slider slides in the groove body, and the slider is driven and controlled by any one of a cylinder, an oil cylinder, and an electric push rod. When the slider is in a contracted state, a sunken groove body is formed. When the slider is ejected, the sunken surface of the groove body is filled. A contact rod wheel (44) is fixedly connected to the bottom surface of the horizontal slide plate (41), and the contact rod wheel (44) slides on the side wall of the lower mold (3) and the inner wall of the adjustable groove body (31).

2. The automobile interior trim panel forming device according to claim 1, characterized in that: A cloth pressing rod (322) is fixedly connected to the top surface of the spring top cloth rod (32) close to the side of the top-feed cloth clamping mechanism (4), and the cloth pressing rod (322) is flush with the top surface of the spring top cloth rod (32).

3. The automobile interior trim panel forming device according to claim 1, characterized in that: When the spring top cloth rod (32) is in a retracted state, it is flush with the top surface of the lower mold (3).

4. The automobile interior trim panel forming device according to claim 1, characterized in that: An inserting cloth rod (321) is fixedly connected to the top of the spring top cloth rod (32), and a plugging hole (23) matching the inserting cloth rod (321) is opened on the bottom surface of the fixed-edge middle mold (2).

5. The automobile interior trim panel forming device according to claim 1, characterized in that: The shape of the fixed-edge middle mold (2) is a C shape, and a groove body for fitting with the fixed-edge middle mold (2) is opened on the circumferential side of the bottom surface of the upper mold (1).

6. The automobile interior trim panel forming device according to claim 1, characterized in that: There are multiple direction-changing rollers (42), and the multiple direction-changing rollers (42) are linearly distributed on the top of the horizontal slide plate (41).

7. The automobile interior trim panel forming device according to claim 1, characterized in that: The horizontal slide plate (41) is slidably connected to the fixed-edge middle mold (2) through a sliding mechanism (24), and a return spring is arranged in the sliding mechanism (24).

8. The automobile interior trim panel forming device according to claim 1, characterized in that: The fixed-edge middle mold (2) is elastically connected to the lower mold (3) through an attaching spring (21), and an open end (22) is opened at one end of the fixed-edge middle mold (2).

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