Gas-assisted injection molding process for automobile interior trim

Abstract

The invention discloses a gas-assisted injection molding process for an automobile interior trim. The gas-assisted injection molding process comprises injection molding pressure maintaining, product air passage formation by high-pressure air blowing, pressure maintaining for high-pressure gases in an air passage and pressure maintaining for normal-pressure gases in the air passage; during injection molding pressure maintaining, a die at one side of a product appearance surface is internally provided with a plurality of heating pipes at equal intervals along the axis of the air passage of a product, the axes of the heating pipes are arranged along the normal direction of the product appearance surface, and the distance from the end surface of each of the heating pipes to the product appearance surface is 20-25mm; and before rubber injection molding, the preheating temperature of each of the heating pipes is 1 / 2 of a rubber melting temperature, and the preheating temperature of the die is 30-35 DEG C. By using the injection molding process, the defect that whity bright marks are generated on a surface corresponding to the position of the air passage can be eliminated.

Description

technical field [0001] The invention relates to a gas-assisted injection molding process, in particular to a gas-assisted injection molding process suitable for automobile interior trim parts with large air passage cross-sectional area and long air passage length. Background technique [0002] The cross-sectional area of ​​the air passage of traditional automotive interior injection molding products is elliptical or circular, and the cross-sectional area is relatively small, and it is basically the same or similar to the outer wall and inner wall of the air passage. However, in order to increase the aesthetic feeling of some models, the cross-sectional area of ​​the air passage is designed to be large. Using traditional injection molds and processes will produce a whitish phenomenon along with the air passage, which affects the appearance of the product and the product qualification rate is low. Contents of the invention [0003] In view of the deficiencies of the above-me...

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Problems solved by technology

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a gas-assisted injection molding process for automotive interior parts, which can solve the problem of whitish bright marks on the corresponding surface of the product at the position of the air passage.

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