Small angle punching method for automobile trunk trim panel

Abstract

The application provides a small-angle die cutting method for automobile trunk trim panel, which adjusts the thickness of the cutting edge product cutting position and the edge position in advance, changes the parting line during die cutting and the shape of the die cutting die cutter, ensures that the cutting edge position of the lower end surface of the trunk trim panel and the vertical surface of the second step are located on the same straight line during die cutting, and ensures that the product fabric layer has a shrinkage allowance after die cutting, so that the complete cutting edge part is obtained. The application discloses a small-angle die cutting method for automobile trunk trim panel, which realizes the reduction of die cutting cost by adjusting the thickness of the product die cutting and the edge position, and ensures the quality state of the product die cutting edge on this basis.

Description

Technical Field

[0001] This invention relates to the field of automotive trunk trim processing technology, and more specifically, to a method for small-angle punching of automotive trunk trim. Background Technology

[0002] The trim panel in a car trunk serves to cover the items inside. Its structure generally includes a fabric layer and a bottom layer. The fabric layer is usually bonded to the bottom layer in a composite manner, and the bottom layer material is generally fiberglass or molded felt.

[0003] As the structure of car trunk trim panels becomes more complex, the design of parts often aims to enhance the three-dimensional effect, resulting in excessively small cutting angles at the edges. This makes it difficult for the mold to effectively punch through the edges. When conventional cutting processes are used for direct die cutting, it is easy to cause shrinkage of the bottom layer and non-shrinkage of the top layer, resulting in delamination at the cutting edges. This leads to substandard cutting of parts, increased scrap rate, and thus increased production costs for the parts. Summary of the Invention

[0004] This application aims to provide a method for forming and punching automotive trunk trim panels, which reduces die-cutting costs by changing the thickness of the die-cutting and edge-pressing positions, while ensuring the quality of the die-cutting edges.

[0005] To solve the above problems, the present invention provides a method for small-angle punching of automotive trunk trim panels, comprising the following steps:

[0006] S1: Draw a model drawing according to the actual dimensions of the suitcase trim panels to be die-cut as required;

[0007] S2: Denote the upper face of the model as face B and the lower face as face A;

[0008] S3: Using surface B as a reference, a sunken first step is set near the outer edge of the model drawing, ensuring that the horizontal plane of the first step is 2.5-3mm away from surface A, and the vertical plane of the first step is 10-12mm away from the outer wall of the model drawing.

[0009] S4: Using the horizontal plane of the first step as a reference, continue to set a sunken second step on the outer edge of the model diagram, ensuring that the vertical plane of the second step is 0.3 to 0.5 mm away from the outer wall of the model diagram, and the horizontal plane of the second step is 1.2 to 1.5 mm away from the horizontal plane of the first step;

[0010] S5: Adjust the molding die according to steps S3 and S4, and place the luggage trim panel into the molding die with the fabric layer facing up and the fiberglass layer facing down for molding operation, so that a first and second recessed step are formed on the fabric layer side of the luggage trim panel respectively.

[0011] S6: Place the molded luggage trim panel into the punching die with the fiberglass layer on the bottom and the material layer on the top, and adjust the parting line of the punching die with the horizontal plane of the second step as a reference.

[0012] S7: Adjust the shape of the punching die blade to ensure that the cut edge of the lower end face of the luggage compartment panel is aligned with the vertical surface of the second step during punching, so as to obtain a complete cut edge part.

[0013] The advantages of this invention compared to the prior art are:

[0014] Because the cutting edge position of the product is simulated and adjusted before die-cutting in this invention, that is, a first step is pre-set as the pressing part on the fabric layer to ensure that the fabric layer and the fiberglass layer are pressed evenly, and the second step is used as the actual cutting edge part; in addition, by improving the design of the blade shape, it is ensured that the cutting edge position of the lower end face of the luggage trim panel is on the same straight line as the vertical surface of the second step during punching, so as to obtain a complete cutting edge part, making it difficult for the fabric layer to separate from the fiberglass layer after punching, that is, the edge of the luggage trim panel is flat and does not separate.

[0015] Furthermore, the molding die includes a punch and a die, and the outer edge of the punch is detachably provided with a first protrusion for forming a first step and a second protrusion for forming a second step.

[0016] Furthermore, in step S2, the horizontal plane of the first step is 3mm away from surface A, and the vertical plane of the first step is 10mm away from the outer wall of the model diagram.

[0017] Furthermore, in step S4, the vertical plane of the second step is 0.5 mm away from the outer wall of the model diagram, and the horizontal plane of the second step is 1.5 mm away from the horizontal plane of the first step.

[0018] Furthermore, the cross-section of the blade is trapezoidal, and the upper end face of the blade near the trunk trim panel is opposite to the outer end of the horizontal plane of the first step, while the lower end face of the blade near the trunk trim panel is on the same straight line as the vertical plane of the first step.

[0019] Furthermore, other improvements and advantages of the invention will be set forth in the following detailed description and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0020] Figure 1 A schematic diagram illustrating the structure for adjusting the thickness of the trim edge of a suitcase panel.

[0021] Figure 2 A schematic diagram of the parting surface of a luggage trim mold;

[0022] Figure 3 This is a schematic diagram of the cutting edge structure of a luggage trim mold.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First step; 2. Second step; 3. Parting line; 4. Cutting edge. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] This invention provides a method for small-angle punching of automotive trunk trim panels, comprising the following steps:

[0027] S1: Draw a structural model of the luggage trim panel to be die-cut according to the actual size at a 1:1 scale.

[0028] S2: Place the model diagram horizontally, and designate its top face as face B and its bottom face as face A;

[0029] S3: First, using surface B as the reference surface, set a recessed first step 1 near the outer edge of the model drawing. Ensure that the horizontal distance of the first step 1 from surface A is H1, which is 2.5-3mm, and the vertical distance of the first step 1 from the outer wall of the model drawing is W1, which is 10-12mm. Here, H1 actually represents the edge pressing thickness of the product, which is the thickness dimension of the fabric layer and the fiberglass layer after they are pressed together.

[0030] S4: Next, using the horizontal plane of the first step 1 as a reference, continue to set a sunken second step 2 on the outer edge of the model diagram, ensuring that the vertical plane of the second step 2 is 0.3 to 0.5 mm away from the outer wall of the model diagram, and that the horizontal plane of the second step 2 is 1.2 to 1.5 mm away from the horizontal plane of the first step 1.

[0031] S5: Adjust the molding die according to the design scheme in steps S3 and S4. Place the luggage trim panel with the fabric layer facing up and the fiberglass layer facing down into the dedicated molding die at the set angle and position. Close the molding die according to the set parameters to form a recessed first step 1 and a second step 2 on the fabric layer side of the luggage trim panel. In this structure, the fabric layer corresponds to side B of the model drawing, and the fiberglass layer corresponds to side A of the model drawing. See Appendix. Figure 1 ;

[0032] S6: Place the molded luggage trim panel into the dedicated punching die according to the set angle and position. Specifically, place the punching die with the fiberglass layer below and the material layer above, and adjust the parting line 3 of the punching die based on the horizontal plane of the second step 2. See Appendix Figure 2 ;

[0033] S7: Adjust the cutting edge shape of the punching die to ensure that the cut edge of the lower end face of the trunk trim panel is aligned with the vertical surface of the second step 2 during punching, in order to obtain a complete cut edge part. See Appendix. Figure 3 .

[0034] Specifically, the dedicated molding die involved in this embodiment includes a punch and a die, and the outer edge of the punch is detachably provided with a first protrusion for forming the first step 1 and a second protrusion for forming the second step 2. In this structure, the first protrusion, the second protrusion and the punch are detachably connected, which facilitates subsequent maintenance and replacement, and allows for quick replacement of the corresponding protrusions for different product specifications. On the other hand, this setting also allows for the reuse of some of the original molding dies, improving equipment reuse rate and reducing processing costs.

[0035] More specifically, in the above punching method, in order to ensure that the product has a flatter and more beautiful shape after die cutting, the distance between the horizontal plane of the first step 1 and surface A in step S2 is preferably 3mm, and the distance between the vertical plane of the first step 1 and the outer wall of the model is preferably W1=10.5mm. Specifically, in this structure, the distance W1 is actually the value of W2 plus the horizontal distance S1 between the vertical plane of the first step 1 and the vertical plane of the second step 2. Here, it is necessary to ensure that S1 is about 10mm.

[0036] Similarly, in step S4, the distance between the vertical surface of the second step 2 and the outer wall of the model diagram is preferably W2=0.5mm, and the distance between the horizontal surface of the second step 2 and the horizontal surface of the first step 1 is preferably H2=1.5mm.

[0037] For others, see Appendix Figure 3 In this embodiment, the cross-section of the blade 4 is trapezoidal, and the upper end face of the blade 4 near the trunk trim panel is aligned with the outer end of the horizontal plane of the second step 2. The lower end face of the blade 4 near the trunk trim panel is aligned with the vertical plane of the second step 2.

[0038] In this embodiment, the cutting edge position of the product is pre-adjusted, that is, a first step 1 is pre-set as the pressing edge part in the fabric layer to ensure that the fabric layer and the fiberglass layer are pressed evenly, and the second step 2 is used as the actual cutting edge part; in addition, the shape of the blade 4 is improved so that when the fiberglass layer is cut, the cut of the fiberglass layer corresponds to the vertical surface of the second step 2, and the blade 4 is beveled on the side near the product, and the cut is not a vertical flat cut. The fabric layer has a corresponding shrinkage allowance, so that the fabric layer is not easy to separate from the fiberglass layer after punching, that is, the edge of the luggage panel is flat and does not separate.

[0039] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for small-angle punching of automotive trunk trim panels, characterized in that, Includes the following steps: S1: The luggage trim panel is die-cut as needed. The luggage trim panel is a composite material structure, including a fabric layer and a fiberglass layer. A model drawing is made according to the actual size. S2: Denote the upper face of the model as face B and the lower face as face A; S3: Based on surface B, a sunken first step (1) is set near the outer edge of the model diagram, ensuring that the horizontal plane of the first step (1) is 2.5-3 mm away from surface A, and the vertical plane of the first step (1) is 10-12 mm away from the outer wall of the model diagram. S4: Based on the horizontal plane of the first step (1), continue to set a sunken second step (2) on the outer edge of the model diagram, ensuring that the vertical plane of the second step (2) is 0.3 to 0.5 mm away from the outer wall of the model diagram, and the horizontal plane of the second step (2) is 1.2 to 1.5 mm away from the horizontal plane of the first step (1); S5: Adjust the molding die according to steps S3 and S4, and place the luggage trim panel into the molding die with the fabric layer facing up and the fiberglass layer facing down for molding operation, so that a first step (1) and a second step (2) are formed on the fabric layer side of the luggage trim panel respectively; the molding die includes a punch and a die, and the outer edge of the punch is respectively provided with a first protrusion for forming the first step (1) and a second protrusion for forming the second step (2); S5: Place the molded luggage trim panel into the punching die with the glass fiber layer facing upwards, and adjust the parting line (3) of the punching die based on the horizontal plane of the second step (2); S6: Adjust the shape of the cutting edge (4) of the punching die to ensure that the cutting edge position of the lower end face of the luggage trim panel is on the same straight line as the vertical surface of the second step (2) during punching, so as to obtain a complete cutting edge part; the cross-section of the cutting edge (4) is a trapezoidal structure, and the upper end face of the cutting edge (4) near the luggage trim panel is aligned with the outer end of the horizontal plane of the second step (2), and the lower end face of the cutting edge (4) near the luggage trim panel is on the same straight line as the vertical surface of the second step (2).

2. The method for small-angle punching of automotive trunk trim panels according to claim 1, characterized in that: In step S2, the horizontal plane of the first step (1) is 3mm away from surface A, and the vertical plane of the first step (1) is 10.5mm away from the outer wall of the model diagram.

3. The method for small-angle punching of automotive trunk trim panels according to claim 1, characterized in that: In step S4, the vertical plane of the second step (2) is 0.5 mm away from the outer wall of the model diagram, and the horizontal plane of the second step (2) is 1.5 mm away from the horizontal plane of the first step (1).

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