Automobile interior trimming panel mold facilitating installation of sound-absorbing cotton and demolding method

Abstract

The invention provides an automotive trim panel mold convenient for mounting sound-absorbing cotton, which comprises a fixed mold and a movable mold, the fixed mold is provided with a first substrate, the substrate is provided with a first convex part and a second convex part which are symmetrically arranged, the movable mold is provided with a second substrate, and the second substrate is provided with a concave part; and the side wall of the concave part is in transition fit with the side wall of the first convex part and the side wall of the second convex part respectively. The invention further provides a demolding method of the automobile interior trimming panel mold facilitating installation of the sound-absorbing cotton. The demolding method comprises the steps that the straight ejection mechanism is arranged on the parting surface of the movable mold body and the fixed mold body, and the ejection direction of the straight ejection mechanism is the same as the extending direction of an interior trimming panel buckle forming gap; and the movable mold linearly retreats along the symmetric center line direction of the first convex part and the second convex part, and meanwhile, the straight ejection mechanism synchronously ejects out along the same direction. Through the transition fit design of the first convex part, the second convex part and the movable mold concave part which are symmetrically arranged, and in combination with a straight ejection synchronous demolding method, a traditional inclined sliding block structure is not needed, and the mold manufacturing complexity and the production cost are remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and particularly relates to a mold and a demolding method for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton. Background Art

[0002] Currently, there are three ways to fix the sound-absorbing cotton to the automotive interior trim panel: the sound-absorbing cotton is bonded to the interior trim panel with tape, which requires tape materials, release paper and a compounding process, resulting in a relatively high part cost, and the tape odor and VOC are not friendly; the sound-absorbing cotton is welded to the interior trim panel by ultrasonic welding, which requires welding equipment and process man-hours, and the material at the welding point is prone to high-temperature degradation and has an unfriendly odor; the sound-absorbing cotton is fixed to the interior trim panel by a buckle growing on the interior trim panel. Compared with the above two methods, it does not generate odor and is the most friendly to passengers and manufacturers.

[0003] However, when the sound-absorbing cotton is fixed to the interior trim panel by a buckle growing on the interior trim panel, there is an undercut between the buckle and the main demolding direction of the interior trim panel injection mold. In the mold, an inclined slider structure needs to be adopted to smoothly demold, which increases the manufacturing cost and complexity of the injection mold. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and provide a mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton, including a fixed mold and a movable mold, further including:

[0005] The fixed mold is provided with a first base, and symmetrically arranged first convex part and second convex part are provided on the base. The movable mold is provided with a second base, and a concave part is provided on the second base. An interior trim panel base forming gap is formed by the cooperation between the first base and the second base. The concave part is arranged opposite to the first convex part and the second convex part. An interior trim panel buckle forming gap is formed by the cooperation between the bottom ends of the first convex part, the second convex part and the concave part. The side walls of the concave part are in transitional fit with the side walls of the first convex part and the second convex part respectively.

[0006] Further, the bottom end of the concave part is composed of two symmetrically inclined wall surfaces, and an included angle is formed by the intersection of the two wall surfaces. Further still, the included angle α of the inclined wall surfaces is 120° ± 5°. Even further, the top wall surfaces of the first convex part and the second convex part are inclined and matched with the symmetrically inclined wall surfaces at the bottom end of the concave part, and the top wall surfaces of the first convex part and the second convex part and the symmetrically inclined wall surfaces at the bottom end of the concave part are in clearance fit.

[0007] Further, the height of the first convex part and the second convex part is 0.8 - 0.95 times the depth of the concave part.

[0008] A demolding method for a mold of an automotive interior trim panel facilitating the installation of a sound-absorbing cotton includes the following steps:

[0009] A direct ejection mechanism is provided at the parting surface between the moving mold and the fixed mold, and the ejection direction of the direct ejection mechanism is the same as the extension direction of the forming gap of the interior trim panel buckle.

[0010] The moving mold retreats linearly along the symmetric center line direction of the first convex part and the second convex part, and at the same time, the direct ejection mechanism ejects synchronously in the same direction.

[0011] Furthermore, the ejection stroke of the direct ejection mechanism is 1.2 - 1.8 times the depth of the concave part.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. Through the transitional fit design of the symmetrically arranged first convex part, second convex part and the concave part of the moving mold, combined with the direct ejection synchronous demolding method, the traditional inclined slider structure is not required, significantly reducing the mold manufacturing complexity and production cost.

[0014] 2. The matching clearance fit between the symmetrically inclined wall surfaces at the bottom end of the concave part and the top ends of the first convex part and the second convex part ensures the one - time forming of the buckle structure.

[0015] 3. The synchronous linear motion of the direct ejection mechanism and the moving mold along the extension direction (L - direction) of the buckle avoids the stress cracking at the root of the buckle caused by the traditional inclined ejector.

[0016] 4. By adjusting the ratio of the heights of the first convex part and the second convex part to the depth of the concave part, the length of the buckle support can be flexibly controlled to meet the NVH performance requirements of different vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic structural diagram of a mold for an automotive interior trim panel facilitating the installation of a sound - absorbing cotton;

[0018] Figure 2 Cross - sectional view of an interior trim panel manufactured by a mold for an automotive interior trim panel facilitating the installation of a sound - absorbing cotton;

[0019] Figure 3 Three - dimensional view of an interior trim panel manufactured by a mold for an automotive interior trim panel facilitating the installation of a sound - absorbing cotton;

[0020] Figure 4 General structure diagram of an automotive interior trim panel manufactured by a mold;

[0021] Figure 5 Sound - absorbing cotton.

[0022] Reference numerals: Reference numerals: 1 - fixed mold; 2 - moving mold; 3 - forming gap of interior trim panel buckle; 4 - forming gap of interior trim panel base; 5 - ejector rod; 6 - base body; 7 - buckle; 8 - sound - absorbing cotton; 11 - first base; 12 - first convex part; 13 - second convex part; 21 - concave part; 22 - second base; 61 - through - hole; 71 - support; 72 - positioning part; 81 - mounting hole. Detailed implementation manners

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] Embodiment 1

[0025] As Figure 1 shown, a mold for an automobile interior trim panel facilitating the installation of sound-absorbing cotton includes a fixed mold 1 and a movable mold 2. The fixed mold 1 is provided with a first base 11, and symmetrically arranged first convex portions 12 and second convex portions 13 are provided on the base 11. The movable mold 2 is provided with a second base 22, and a concave portion 21 is provided on the second base 22. An interior trim panel base forming gap 4 is formed by the cooperation between the first base 11 and the second base 22. The concave portion 21 is arranged opposite to the first convex portion 12 and the second convex portion 13. An interior trim panel buckle forming gap 3 is formed by the cooperation between the bottoms of the first convex portion 12, the second convex portion 13 and the concave portion 21. The side walls of the concave portion 21 are in transitional fit with the side walls of the first convex portion 12 and the side walls of the second convex portion 13 respectively. The transitional fit refers to a positioning structure formed by the side wall of the convex portion and the side wall of the concave portion with an H7 / h6 fit tolerance.

[0026] Wherein, the bottom end of the concave portion 21 is composed of two symmetrically inclined wall surfaces, and an included angle is formed by the intersection of the two wall surfaces. The included angle α of the inclined wall surfaces is 120° ± 5°. Correspondingly, the top wall surfaces of the first convex portion 12 and the second convex portion 13 are inclined to match the symmetrically inclined wall surfaces at the bottom end of the concave portion 21. The above settings are for forming the arrow shape of the clamping member 72 as Figure 2 shown, which is convenient for fixing the sound-absorbing cotton 8. The heights of the first convex portion 12 and the second convex portion 13 are 0.8 - 0.95 times the depth of the concave portion 21. In this way, a gap can be formed between the tops of the first convex portion 12 and the second convex portion 13 and the bottom end of the concave portion 21 during mold closing, forming the arrow shape of the clamping member 72.

[0027] The product obtained by the mold in this embodiment is as Figure 2 and Figure 3 shown, which is an automobile interior trim panel, including a base body 6 and a buckle 7 fixed on the base body 6. The sound-absorbing cotton 8 is installed on the base body 6 through the buckle 7. The base body 6 corresponds to the interior trim panel base forming gap 4 in the mold, and the buckle 7 corresponds to the interior trim panel buckle forming gap 3, and both are formed through the corresponding gaps.

[0028] The matrix 6 is provided with at least one snap 7. The snap 7 includes a support member 71 and a clamping member 72. One end of the support member 71 is fixedly connected to the surface of the matrix 6, and the other end of the support member 71 is fixedly connected to two clamping members 72. The sides of the clamping member 72 are fixedly connected at an angle and form a pointed structure at the end of the support member 71; the clamping member 72 and the support member 71 are plate-like structures. The support member 71 is formed by the gap between the first convex portion 12 and the second convex portion 13, while the clamping member 72 is formed by the gap between the tops of the first convex portion 12 and the second convex portion 13 and the bottom end of the concave portion 21. In this embodiment, the two clamping members 72 form an arrow structure at the end of the support member 71.

[0029] The matrix 6 is provided with two through holes 61 at the connection with the support member 71. The through holes 61 are used to integrally form the matrix 6, the support member 71 and the clamping member 72 in the corresponding mold. At the same time, the side walls of the concave portion 21 are in transitional fit with the side walls of the first convex portion 12 and the second convex portion 13 respectively, and there is also a gap between the tops of the first convex portion 12 and the second convex portion 13 and the bottom end of the concave portion 21. In this way, the demolding line is at the end of the clamping member 72 and no reverse buckling structure is formed, enabling demolding by the direct ejection method; the through holes 61 are formed due to the first convex portion 12 and the second convex portion 13 passing through the matrix 6.

[0030] Correspondingly, the surface of the sound-absorbing cotton 8 is provided with mounting holes 81. The mounting holes 81 are used to pass the support member 71 through the mounting holes 81 and then clamp the clamping member 72 with the sound-absorbing cotton 8. As Figure 4 and Figure 5 shown, Figure 4 is the overall structure of the interior trim panel before installation, Figure 5 is the sound-absorbing cotton.

[0031] Embodiment 2

[0032] A demolding method for a mold of an automobile interior trim panel facilitating the installation of a sound-absorbing cotton, comprising the following steps:

[0033] A direct ejection mechanism is arranged on the parting surface of the moving mold 2 and the fixed mold 1. The ejection direction of the direct ejection mechanism is the same as the extending direction of the forming gap 3 of the interior trim panel snap. The ejector rod 5 of the direct ejection mechanism is as Figure 1 shown in

[0034] The moving mold 2 linearly retreats along the direction L which is the same direction as the symmetry center line of the first convex portion 12 and the second convex portion 13. The direction L is as Figure 1 shown, and at the same time the direct ejection mechanism ejects synchronously along the same direction;

[0035] Among them, the ejection stroke of the direct ejection mechanism is 1.2 - 1.8 times the depth of the concave portion 21, which is convenient for demolding.

[0036] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A mold for an automobile interior trim panel facilitating the installation of sound-absorbing cotton, comprising a fixed mold (1) and a movable mold (2), characterized in that, Further included are: The fixed mold (1) is provided with a first base (11), on which a symmetrically arranged first convex part (12) and a second convex part (13) are provided. The moving mold (2) is provided with a second base (22), on which a concave part (21) is provided. An interior trim panel base forming gap (4) is formed by the cooperation between the first base (11) and the second base (22). The concave part (21) is arranged opposite to the first convex part (12) and the second convex part (13). An interior trim panel buckle forming gap (3) is formed by the cooperation between the bottoms of the first convex part (12), the second convex part (13) and the concave part (21). The side walls of the concave part (21) are in transitional fit with the side walls of the first convex part (12) and the side walls of the second convex part (13) respectively.

2. The mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 1, characterized in that: The bottom end of the concave part (21) is composed of two symmetrically inclined wall surfaces, and the two wall surfaces intersect to form an included angle.

3. The mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 2, characterized in that: The included angle α of the inclined wall surfaces is 120° ± 5°.

4. The mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 3, characterized in that: The top wall surfaces of the first convex part (12) and the second convex part (13) are inclined to match the symmetrically inclined wall surfaces at the bottom end of the concave part (21).

5. The mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 4, characterized in that: The top wall surfaces of the first convex part (12) and the second convex part (13) and the symmetrically inclined wall surfaces at the bottom end of the concave part (21) are in clearance fit.

6. The mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 1, characterized in that: The heights of the first convex part (12) and the second convex part (13) are 0.8 - 0.95 times the depth of the concave part (21).

7. The demoulding method of the mould for the automobile interior trim panel facilitating the installation of sound-absorbing cotton according to any one of claims 1-6, characterized in that, It includes the following steps: A direct ejection mechanism is arranged on the parting surface between the moving mold (2) and the fixed mold (1), and the ejection direction of the direct ejection mechanism is the same as the extending direction of the interior trim panel buckle forming gap (3); The moving mold (2) linearly retreats along the symmetric center line direction (L) of the first convex part (12) and the second convex part (13), and at the same time, the direct ejection mechanism ejects synchronously in the same direction.

8. The demolding method of the mold for an automotive interior trim panel facilitating the installation of a sound-absorbing cotton according to claim 7, characterized in that: The ejection stroke of the direct ejection mechanism is 1.2 - 1.8 times the depth of the concave part (21).

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