Injection molding process for eliminating shrinkage marks and shrinkage cavities of thick-wall light guide piece during manufacturing of automobile lamps

Abstract

The invention discloses an injection molding process for eliminating shrinkage marks and shrinkage cavities of a thick-wall light guide piece during manufacturing of automobile lamps. In the injection molding process, the mold temperature is 125 to 135 DEG C, the material temperature is 255 to 265 DEG C, the pressure retaining time is 20 to 30 seconds and the retained pressure is 140 to 150 MPa. By the injection molding process, the shrinkage marks and the shrinkage cavities can be eliminated, and formation and appearance quality can be improved; the injection molding process is simple and efficient in operation.

Description

technical field [0001] The invention relates to the field of automobile lamp manufacturing, in particular to a process method for eliminating sink marks and shrinkage cavities of thick-walled (thickness between 10 mm and 15 mm) light guides during injection molding. Background technique [0002] The automotive lighting industry is a new industry that has developed rapidly with the rapid development of the automotive industry in the past century, and has maintained a rapid growth trend in recent years. In the baptism of history, car lights have undergone changes from generation to generation. From the most primitive incandescent lamps, tungsten halogen lamps, and HID and LED lights that have appeared in recent years, they have experienced more than 100 years of development, and related technologies are becoming more and more mature. . [0003] Light guides used in automotive lighting systems not only have a long service life and better lighting effects, but also have the adv...

AI Technical Summary

Problems solved by technology

However, too low mold temperature will lead to poor molding quality and flow marks on the pattern surface, and too long cooling time will lead to long molding cycle and low productivity

[0009] Therefore, an effective process method is urgently needed to solve the phenomenon of sink marks and shrinkage holes caused by large shrinkage of thick-walled light guides when they are out of the mold.

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