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

A technology for automotive lamps and light guides is applied in the field of making thick-walled light guides eliminate their shrinkage marks and shrinkage holes during the injection molding process. The effect of reducing production cycle and improving production efficiency

Inactive Publication Date: 2017-05-10
H A AUTOMOTIVE SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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Embodiment Construction

[0030] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0031] The invention aims to provide an injection molding process scheme for a light distribution mirror in a thick-walled light guide, which solves the phenomenon of sink marks and shrinkage cavities caused by too much shrinkage during injection molding of the thick-walled light guide.

[0032] With the help of MOLDFLOW software, the PC thick-walled light guide with a thickness between 10mm and 15mm was analyzed and simulated multiple times, and the optimal injection molding process was found by continuously optimizing the process parameters. When the product is opened, the internal volume shrinkage rate does not exceed 5% (that is, the volume shrinkage rate at the 1 / 4 wall thickness does not exceed 5%), and the adjacent shrinkage rate does not exceed 2%. Good solidification to avoid sink marks and shrinkage cavities. Then it solves the p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/76B29C45/78B29C45/77B29L31/30B29L11/00
CPCB29C45/0025B29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76561B29L2011/0075B29L2031/30B29L2031/747
Inventor 王昌威
Owner H A AUTOMOTIVE SYST INC
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