Free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts

Abstract

The invention discloses a free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts. The free-spraying metallic-luster injection molding process comprises the following steps: adding metal powder into a raw material which is a plastic base material, and arranging a random water path close to a mould cavity of an injection mould with the high surface quality and the small thermal deformation to enable the surface temperature of the mould to be uniform; pouring the mould by adopting a hooked pouring gate, a pin-point gate and a side pouring gate; controlling the temperature of the surface of the mould in an injection-molding process; and pouring by adopting one or more pouring gates by adopting a high-pressure low-speed injection molding technique, a low-pressure high-speed injection molding technique or a normal-pressure normal-speed injection molding technique, and a sequential injection molding process, wherein the pouring gates adopt a needle valve type pouring gates. The parts produced by adopting the free-spraying metallic-luster injection molding process have no flow marks and solution marks on surfaces, have the good metallic luster and can be used for car interior trim parts and exterior parts.

Description

Technical field [0001] The invention relates to the field of automobile parts manufacturing, in particular to a spray-free metallic luster injection molding process used for automobile interior and exterior parts. technical background [0002] "Low carbon, environmental protection, energy saving and emission reduction" is one of the important issues of the Twelfth Five-Year Plan. For automakers, considering the use of green materials and processes in the product design and manufacturing phases is important for improving the environmental protection of final products. Sex has a positive meaning. At the same time, due to the increasingly fierce competition of automotive products, the prices of products are gradually decreasing, but the requirements of customers are gradually increasing, so the cost pressure of automobile manufacturers and component suppliers is very high. In response to this situation, automobile manufacturers and component suppliers are actively introducing new s...

AI Technical Summary

Problems solved by technology

However, the painting process has the following problems. First, the process is complicated. After the blank is injected, it is necessary to increase the basic links such as transportation, pretreatment, painting, and transportation. Part of the painting process requires multiple production processes such as primer, topcoat, and UV curing paint.

Secondly, the defects produced by the production of each part cannot be recycled and reused due to the sprayed paint, causing environmental pollution; again, there are a large amount of organic solvents in the paint, and most of the solvents are benzene or toluene aromatic solvents. Physical or harmful, but also environmental problems

The painted parts have the following problems: if the painted parts are scratched by sharp objects during use, the surface paint layer will fall off, exposing the underlying plastic substrate and affecting the aesthetics; the painted parts have non-recyclable thermosetting paint on the surface, As a result, it is difficult for the product to meet the requirements of the national automotive product mandatory recycling regulations; the final use of paint doubles or even triples the cost of the product

[0005] These current studies mainly focus on the development and preparation of raw materials for spray-free metallic luster, and seldom involve the development of preparation process conditions for spray-free metallic luster parts and the development of molds

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