Large automobile part soft and hard plastic double color injection molding method and mould device

Abstract

The invention discloses a large automobile part soft and hard plastic double color injection molding method, which is characterized by comprising the steps of: 1) disposing a middle rotary die, a left die and a right die, with the left side and right side of the middle rotary die both being provided with a cavity, cooperating the middle rotary die with the left die to form a primary molding die, and cooperating the middle rotary die with the right die to form a secondary molding die; 2) locking the primary molding product of a monochromatic material on a moving die or fixed die, or setting an inclined plane on the moving die or fixed die at the soft and hard plastic horizontal interjunction and carrying out gentle transition plastic reduction to prevent material spillover and excessive flash; 3) assembling the middle rotary die with the left die, and injecting a first color material into the cavity to form a monochromatic hard plastic part; and 4) splitting the middle rotary die and the left die, then conducting 180-degree rotation, and conducting assembly with the right die, and injecting a second color material into the cavity to form a double color soft and hard plastic product. The invention also discloses a large automobile part soft and hard plastic double color injection molding for implementation of the method.

Description

technical field [0001] The invention relates to injection mold technology, in particular to a soft and hard rubber two-color injection molding method and a mold device for large-scale automobile parts. Background technique [0002] Injection molding technology has experienced about 125 years of development. Due to the introduction, improvement and improvement of various processes and technologies, it shows the economy of injection molding technology. Multi-component injection molding is a special plastic injection molding method developed in recent years to adapt to this trend. It can form products composed of a variety of different colors or different plastics. It is actually an in-mold assembly or in-mold welding. "Insert molding" process method. Since multi-component injection molding technology requires injection molding equipment with special structure, the design and manufacture of molds are complicated, the cost is high, and there must be an automatic control device ...

AI Technical Summary

Problems solved by technology

[0009] 1. Under the change from high temperature to normal temperature environment, the cooling shrinkage of the product will produce a tight force, which will cause the product to be loosened. This situation will cause the monochrome hard rubber part formed by the injection molding of the first color material to be loosened, which will be used for the subsequent second. Two-color soft and hard rubber products are injection molded with two-color materials, leaving hidden dangers of critique;

[0010] 2. Product shrinkage and cumulative processing errors will lead to shrinkage of the hard rubber part at the intersection of soft and hard rubber levels, forming gaps, which will leave a hidden danger of cracking when the subsequent two-color soft and hard rubber products are injection molded with the second color material

[0011] 3. Under the environment of strong injection pressure of the injection molding machine, the hard rubber part at the vertical intersection of soft and hard rubber will be punched and deformed, forming a gap, which will leave a gap for the subsequent two-color soft and hard rubber product injection molding of the second color material Hidden dangers of criticism

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