Injection molding method for soft surface and stitch lines of automotive door interior trimming panel

Abstract

The invention discloses an injection molding method for a soft surface and stitch lines of an automotive door interior trimming panel. The method comprises the following three steps: 1 surface premolding; 2 finishing adding of real stitch lines to complicated shapes of curved surfaces and the like through 3D stitching on the surface; and 3 carrying out injection molding through a low-pressure injection molding mold to finish the injected automotive interior with the surface with target grains and the stitch lines. Products produced by the injection molding method are uniform in size, can be seamlessly lapped with matched parts, and are high in size stability, relatively small in internal stress, and not easy to deform; the stitch lines can be added to the curved surfaces and complicated surfaces; and the model of the automotive door interior trimming panel is beautified.

Description

technical field [0001] The invention relates to a processing method of a car door trim panel, in particular to an assembly molding process for producing a skin and a base material of a car interior trim. Background technique [0002] In order to achieve comfort and aesthetic effect, automotive interior parts usually add soft skin with specific texture and stitching on the surface. At present, this process is divided into the following two methods: [0003] 1. High-pressure injection molding + bonding: Injection molded plates and purchased skin, and then bonded (the skin has lines, but it is flat). The process is to high-pressure injection mold plastic products first, and then attach the skin to the surface of the product by means of vacuum forming machine or manual lamination. This method is difficult to achieve the effect of curved surface sewing. [0004] 2. Low-pressure integrated injection molding: Lay the purchased skin in the mold in advance (the skin has lines, but i...

AI Technical Summary

Problems solved by technology

The process is to high-pressure injection mold plastic products first, and then attach the skin to the surface of the product by means of vacuum forming machine or manual lamination. This method is difficult to achieve the effect of curved surface sewing

[0004] 2. Low-pressure integrated injection molding: Lay the purchased skin in the mold in advance (the skin has lines, but it is flat) and use low-pressure injection molding to make the plastic fit with the skin at the same time, and the actual sewing effect of the curved surface cannot be completed.

[0005] The disadvantages of the above two methods are: the process is too long, the operation is complicated, the defect rate is high, the dimensional stability is poor, the internal stress of the product is large, and deformation such as warping is easy to occur, and the cost of labor and equipment is high.

[0006] At the same time, the traditional sewing method has the following disadvantages: the sewing thread can only be added to the flat part after cutting, and cannot be sewn on the three-dimensional shape (curved surface, sharp corner part) after the single skin is formed, and the visual effect of simulation plus actual sewing

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