Automobile trunk cover plate edge hemming forming die

Abstract

The utility model discloses a kind of automobile luggage compartment front cover plate edge edge covering forming die, it is related to the production and processing technical field of luggage compartment front cover plate, lower template top surface is provided with the cavity of accommodating luggage compartment front cover plate, and the junction of cavity bottom and cavity wall of the cavity is provided with the transition forming surface of forming chamfer, upper template bottom surface is provided with the material pressing protrusion for being pressed into the forming cavity of luggage compartment front cover plate, heating pipe is arranged in material pressing protrusion, and heating pipe is sequentially arranged along the periphery contour of material pressing protrusion, the bottom surface outside edge of material pressing protrusion is pressed on the edge of the cavity mouth edge when upper template and lower template close die;While forming edge edge covering structure can also remove excess felt cloth on cover plate.

Description

Technical Field

[0001] This utility model relates to the field of production and processing technology of trunk front cover, specifically a molding die for edge wrapping of a car trunk front cover. Background Technology

[0002] The document titled "A PP Honeycomb Panel Material Luggage Front Baffle Part and Its Manufacturing and Use Method" (Document No. CN114043792A) discloses a PP honeycomb panel luggage front baffle. It uses a PP honeycomb panel 4 as the base material, with a pile carpet 5 laminated to the surface and a non-woven fabric 6 laminated to the back. The pile carpet 5 covers the outer edge of the PP honeycomb panel 4, forming an edge trim 2, and a pressing edge 3 is also provided on the back of the part. However, the aforementioned document only discloses the general process of manufacturing and does not involve the specific mold design scheme for forming the edge trim structure. Since the molding quality of the edge trim structure directly affects the overall performance of the luggage front baffle, how to design a molding mold that matches the edge trim structure to achieve precise and efficient edge trim molding has become an urgent technical problem to be solved. Utility Model Content

[0003] The purpose of this utility model is to provide a molding die for forming the edge of the front cover of a car trunk, which can remove excess felt on the cover while forming the edge binding structure.

[0004] This utility model can be achieved through the following technical solution: a molding die for forming the edge of a car trunk front cover, wherein the top surface of the lower mold plate is provided with a cavity for accommodating the trunk front cover, the bottom edge of the arc-shaped transition forming surface is flush with the bottom of the cavity and extends smoothly, the top edge of the transition forming surface is flush with the cavity wall and extends smoothly, forming the edge forming surface of the trunk front cover, the bottom surface of the upper mold plate is provided with a pressing protrusion for pressing the trunk front cover into the cavity, a heating tube is arranged inside the pressing protrusion, and the heating tube is arranged along the periphery of the pressing protrusion, and when the upper mold plate and the lower mold plate are closed, the outer edge of the bottom surface of the pressing protrusion is pressed on the edge of the cavity opening.

[0005] Compared with the prior art, the present invention has the following beneficial effects:

[0006] Because the edge of the pressing protrusion is at a high temperature, the edge of the PP honeycomb panel A1 softens and forms a chamfer. At the same time, the felt cloth is wrapped around the edge of the luggage compartment lid. Since the outer edge of the bottom surface of the pressing protrusion is pressed against the edge of the cavity opening, the pressing protrusion at a high temperature can also melt off the excess felt cloth, thus obtaining a complete edge binding structure. In subsequent processing, there is no need to remove the excess felt cloth through a cutting process. Attached Figure Description

[0007] Figure 1A schematic diagram of the structure of the front cover of a car trunk.

[0008] Figure 2 This is a cross-sectional structural diagram of the front cover of a car trunk;

[0009] Figure 3 This is a schematic diagram of the blank before edge banding and forming;

[0010] Figure 4 This is a three-dimensional schematic diagram of the molding die;

[0011] Figure 5 This is a structural diagram of the lower template;

[0012] Figure 6 This is a structural diagram of the template above;

[0013] Figure 7 This is a schematic diagram of the cross-sectional structure of the upper and lower templates in the mold-closed state;

[0014] Figure 8 middle Figure 7 Enlarged view of a portion of region B in the middle;

[0015] Figure 9 This is a schematic diagram of the PP honeycomb panel in the preheated state;

[0016] Figure 10 for Figure 7 Enlarged view of a portion of region C;

[0017] Figure 11 for Figure 6 Enlarged view of a portion of region D. Detailed Implementation

[0018] like Figure 1 , 2 As shown, the front cover A of the luggage compartment in this application is made of PP honeycomb board A1, felt cloth A2, and non-woven fabric A3. A chamfer A4 is provided at the edge of the front cover A of the luggage compartment, and felt cloth A2 is laminated at this position to form an edge binding structure. A recess A5 is provided on the side of the front cover A of the luggage compartment where the non-woven fabric A3 is provided.

[0019] Please see Figure 3-11As shown, a molding die for forming the edge of a car trunk front cover is provided. The top surface of the lower mold plate 10 is provided with a cavity 11 for accommodating the trunk front cover A. The bottom edge of the arc-shaped transition forming surface 113 is flush with and extends along the bottom of the cavity 111, and the top edge of the transition forming surface 113 is flush with and extends along the cavity wall 112, forming the edge forming surface of the trunk front cover A. The bottom surface of the upper mold plate 20 is provided with a pressing protrusion 21 for pressing the trunk front cover A into the cavity 11. A heating tube 22 is arranged inside the pressing protrusion 21, and the heating tube 22 is arranged along the periphery of the pressing protrusion 21. When the upper mold plate 20 and the lower mold plate 10 are closed, the outer edge of the bottom surface of the pressing protrusion 21 is pressed onto the edge of the cavity opening of the cavity 11.

[0020] like Figure 3 As shown, one side of the front cover plate A of the suitcase placed in cavity 11 is laminated with non-woven fabric A3, and the other side is laminated with felt fabric A2. The edge of the felt fabric A2 extends beyond the edge of the PP honeycomb plate A1. The excess felt fabric A2 on the surface of the PP honeycomb plate A1 is the part that needs to be removed. The edges of the PP honeycomb plate A1 are all right angles. In specific operation, first place the front cover plate A of the suitcase in cavity 11 with the non-woven fabric A3 side facing upwards. Then, the heating tube 22 heats the pressing protrusion 21 to 185℃-205℃. Figure 9 As shown, the upper mold 20 moves down until the pressing protrusion 21 contacts the front cover plate A of the luggage compartment, then pauses for 10-15 seconds to soften the edge of the PP honeycomb panel A1. After that, the upper mold 20 continues to move downward until the front cover plate A of the luggage compartment is completely pressed into the cavity 11, so that the edge of the front cover plate A of the luggage compartment forms a chamfer A4. At the same time, the felt cloth A2 is wrapped around the edge of the luggage compartment cover plate A. Since the outer edge of the bottom surface of the pressing protrusion 21 is pressed against the edge of the cavity opening of the cavity 11, the pressing protrusion 21 under high temperature melts the excess felt cloth A2, thus obtaining a complete edge binding structure. In subsequent processing, it is not necessary to remove the excess felt cloth A2 through a cutting process.

[0021] The pressing protrusion 21 extends in a ring shape that conforms to the contour of the front cover A of the luggage compartment. The pressing protrusion 21 includes a bottom surface 211, an inner vertical surface 212, and an outer inclined surface 213. The angle between the bottom surface 211 and the inner vertical surface 212 is a right angle, and the angle between the bottom surface 211 and the outer inclined surface 213 is an obtuse angle. The area covered by the bottom surface 211 is used to heat the edge of the luggage compartment cover A and to press the luggage compartment cover A into the cavity 11. The obtuse angle between the bottom surface 211 and the outer inclined surface 213 increases the cross-section of the upper part of the pressing protrusion 21, which facilitates the installation of the heating tube 22. On the other hand, it reduces the cross-section of the lower part of the pressing protrusion 21, which facilitates the accommodation of the cut-off felt fabric A2 at the outer edge of the pressing protrusion 21. When the edge of the bottom surface 211 on the side away from the pressure plate 23 is in contact with the edge of the cavity opening of the cavity 11, the upper template 20 and the lower template 10 are in a closed mold state. This contact surface is also the parting surface of the mold in this application.

[0022] An annular protrusion 2111 for forming the recess A5 is provided on the bottom surface 211 near the outer inclined surface 213. The annular protrusion 2111 is located in the cavity of the cavity 11 and near the upper edge of the cavity. After the edge of the luggage compartment front cover A is formed, the material shrinks at the edge of the luggage compartment front cover A after cooling by the lower mold 10. If the shrinkage is severe, the felt cloth A2 may detach from the edge of the luggage compartment front cover A. To this end, this application forms a recess A5 on the surface of the luggage compartment front cover A by setting the annular protrusion 2111, which forms a continuous constraint and pressure on the edge joint of the PP honeycomb panel A1 and the felt cloth A2, enhances the tightness of the two, and makes it less likely for the felt cloth A2 to detach from its edge due to the shrinkage of the PP honeycomb panel A1, thereby effectively preventing the edge wrapping from bursting.

[0023] The cross-section of the annular protrusion 2111 is a V-shape or U-shape with an arc-shaped bottom; the arc-shaped bottom design can adapt to the stress changes caused by shrinkage and avoid stress concentration at the interface of the edge.

[0024] A pressure plate 23 is provided within the area enclosed by the pressure protrusion 21. The outer side of the pressure plate 23 is spaced apart from the inner side 212 of the pressure protrusion 21. A compression spring 24 is provided between the pressure plate 23 and the upper template 20. The compression spring 24 provides elastic force to drive the pressure plate 23 away from the upper template 20. The upper template 20 is provided with a through hole 25 along its thickness direction. A cover plate 26 is fixed at the top edge of the through hole 25. A guide rod 27 is slidably connected through the middle of the cover plate 26. The bottom end of the guide rod 27 is fixedly connected to the top surface of the pressure plate 23. The compression spring 24 is sleeved on the outer periphery of the guide rod 27, and one end of the compression spring 24 is... The guide rod 27 is connected to the bottom surface of the cover plate 26 and the top surface of the pressure plate 23. The upper end of the guide rod 27 has a rod head 271 forming a T-shape with the guide rod 27. The diameter of the rod head 271 is larger than the diameter of the through hole on the cover plate 26 through which the guide rod 27 passes. The pressure plate 23 continuously applies elastic pressure to the front cover plate A of the luggage compartment, thereby positioning and pressing the front cover plate A of the luggage compartment located in the cavity 11. The outer side of the pressure plate 23 and the inner side surface 212 of the pressure protrusion 21 are spaced apart to prevent heat from being directly transferred from the pressure protrusion 21 to the edge of the pressure plate 23, thus having a certain heat insulation effect.

[0025] The pressure plate 23 is equipped with a first cooling pipe 28 for cooling the front cover plate A of the luggage compartment. The first cooling pipe 28 is arranged along the outline edge of the pressure plate 23. The first cooling pipe 28 is used to cool the pressure protrusion 21 and the front cover plate A of the luggage compartment at the corresponding position, so as to prevent a large amount of heat around the pressure protrusion 21 from being transferred to the pressure plate 23, so that the heating area of ​​the PP honeycomb panel A1 is concentrated at the edge of the PP honeycomb panel A1.

[0026] The lower mold 10 is equipped with a second cooling pipe 12 for cooling the front cover plate A of the luggage compartment. The second cooling pipe 12 is used to cool the entire lower mold 10, so that the edge of the front cover plate A of the luggage compartment can continue to be cooled in the mold after the edge is formed, without the need to change the cooling tool. At the same time, in the actual production process, the second cooling pipe 12 is always in a cooling state, that is, the bottom of the PP honeycomb panel A1 is cooled while the top of the PP honeycomb panel A1 is heated. The purpose of this is to achieve rapid cooling of the formed PP honeycomb panel A1 and avoid shrinkage at the edge of the product after it is formed.

[0027] A vertically arranged ejector pin 13 is provided at the bottom of the cavity 11 on the lower template 10; when the front cover plate A of the luggage compartment cools to the specified temperature, the ejector pin 13 moves upward to push the front cover plate A of the luggage compartment out of the cavity 11.

Claims

1. A molding die for edge banding of a car trunk front cover, characterized in that: The top surface of the lower template (10) is provided with a cavity (11) for accommodating the front cover plate (A) of the luggage compartment. The bottom edge of the arc-shaped transition forming surface (113) is flush with the bottom of the cavity (111) and extends smoothly. The top edge of the transition forming surface (113) is flush with the cavity wall (112) and extends smoothly, forming the edge forming surface of the front cover plate (A) of the luggage compartment. The bottom surface of the upper template (20) is provided with a pressing protrusion (21) for pressing the front cover plate (A) of the luggage compartment into the cavity (11). A heating tube (22) is arranged inside the pressing protrusion (21), and the heating tube (22) extends smoothly along the periphery of the pressing protrusion (21). When the upper template (20) and the lower template (10) are closed, the outer edge of the bottom surface of the pressing protrusion (21) is pressed onto the edge of the cavity opening of the cavity (11).

2. The edge-sealing mold for the front cover of a car trunk according to claim 1, characterized in that: The extension direction of the pressure protrusion (21) is an annular shape that conforms to the contour of the front cover (A) of the luggage compartment. The pressure protrusion (21) includes a bottom surface (211), an inner side surface (212) and an outer side slope (213). The angle between the bottom surface (211) and the inner side surface (212) is a right angle, and the angle between the bottom surface (211) and the outer side slope (213) is an obtuse angle.

3. The edge-sealing mold for the front cover of a car trunk according to claim 2, characterized in that: An annular protrusion (2111) for forming a recess (A5) is provided on the bottom surface (211) near the outer slope (213). The annular protrusion (2111) is located in the cavity (11) and near the upper edge of the cavity.

4. The edge-sealing forming mold for the front cover of a car trunk according to claim 3, characterized in that: The cross-section of the annular protrusion (2111) is a V-shape or U-shape with an arc-shaped bottom.

5. The edge-sealing mold for the front cover of a car trunk according to claim 2, characterized in that: A pressure plate (23) is provided in the area enclosed by the pressure protrusion (21). The outer side of the pressure plate (23) and the inner side (212) of the pressure protrusion (21) are arranged at a distance. A compression spring (24) is provided between the pressure plate (23) and the upper template (20). The compression spring (24) provides elastic force to drive the pressure plate (23) away from the upper template (20).

6. The edge-sealing forming mold for the front cover of a car trunk according to claim 5, characterized in that: The upper template (20) is provided with a through hole (25) along its thickness direction. A cover plate (26) is fixed at the top edge of the through hole (25). A guide rod (27) is slidably connected through the middle of the cover plate (26). The bottom end of the guide rod (27) is fixedly connected to the top surface of the pressure plate (23). A compression spring (24) is sleeved on the outer periphery of the guide rod (27). One end of the compression spring (24) is connected to the bottom surface of the cover plate (26) and the other end is connected to the top surface of the pressure plate (23). The upper end of the guide rod (27) has a rod head (271) that forms a T-shape with the guide rod (27). The diameter of the rod head (271) is larger than the diameter of the through hole on the cover plate (26) through which the guide rod (27) passes.

7. The edge-sealing mold for the front cover of a car trunk according to claim 5, characterized in that: The pressure plate (23) has a first cooling pipe (28) arranged inside for cooling the front cover (A) of the luggage compartment. The first cooling pipe (28) is arranged along the outline edge of the pressure plate (23).

8. The edge-sealing mold for the front cover of a car trunk according to claim 1, characterized in that: The lower template (10) is provided with a second cooling pipe (12) for cooling the front cover (A) of the luggage compartment.

9. The edge-sealing forming mold for the front cover of a car trunk according to claim 1, characterized in that: Vertical ejector pins (13) are provided at the bottom of the cavity (11) on the lower template (10).

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