Injection molding method of injection molding part for automobile lamp

A technology for automobile lights and injection parts, applied in the coating and other directions, can solve the problems of high cost and long cycle, and achieve the effect of cost saving, wide application range and accurate flow control

Inactive Publication Date: 2017-06-20
HASCO VISION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is used to solve the problems of high cost and long cycle due to the need...

Method used

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  • Injection molding method of injection molding part for automobile lamp
  • Injection molding method of injection molding part for automobile lamp
  • Injection molding method of injection molding part for automobile lamp

Examples

Experimental program
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Effect test

Embodiment

[0037] The method of the present invention is described below by taking the injection molding of a two-color light distribution mirror as an example:

[0038] This embodiment is to solve the defect of gas trapping in the second shot product of the two-color light distribution mirror. The structure of the product is shown in Figure (1). When the second color is injected, the primary product already exists and completely covers the secondary model. Therefore, the place where the primary and secondary models are combined forms a closed cavity with the mold and cannot be discharged. gas.

[0039] The original wall thickness distribution of the product is thin on the upper edge, thicker in the middle, and thinner on the lower side, so the converging angle of the flow fronts is shown in Figure (2), which will form trapped air. Then, by adjusting the wall thickness distribution of the product, as shown in Figure (3), the runway effect of plastic melt flow is used to control the flow...

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PUM

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Abstract

The invention relates to an injection molding method of an injection molding part for an automobile lamp. The injection molding method comprises: firstly performing analogue simulation analysis on a part to be subjected to injection molding, and continuously adjusting distribution of a local wall thickness of the part to be subjected to injection molding till a welding line of the part to be subjected to injection molding is adjusted to an invisible region; and then adjusting the flow of a material flow in the set region of an injection mold according to the part to be subjected to injection molding of which the wall thickness distribution is well adjusted, such that the position and shape of a flowing leading edge of a charging flow on a section of the set region are adjusted and controlled, the flowing leading edges of more than two charging flows are converged in a designated region, and air trapping is eliminated. According to the injection molding method, the wall thickness distribution of a product can be defined in a pre-design phase of the product, the cost of subsequent mold repair is greatly saved, and a mold trial period is shortened. The problems of the existing injection molding manner that the cost is higher and the period is longer caused by request of subsequent mold repair and mold trial are solved.

Description

technical field [0001] The invention relates to the field of injection molding of plastic parts for automobile lamps, in particular to an injection molding method for injection molded parts for automobile lamps. Background technique [0002] With the development trend of lightweight automobiles, the wall thickness of injection molded parts for lamps also tends to be thinner, which leads to the need for two or more gates to ensure that the parts are molded with relatively large dimensions. molding quality. [0003] However, most of the lamp parts are exterior parts, and defects such as weld lines and air traps inevitably appear in multiple gates. Trapped air will cause air marks on the surface of the product, manifested as pits or even burnt, and the defects are very obvious. The formation of trapped air in injection molded parts is nothing more than the following two situations: 1. Two or more material flow fronts surround and trap gas; 2. Material flow and closed cavity (...

Claims

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Application Information

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IPC IPC(8): B29C45/00B29C45/76
CPCB29C45/0025B29C45/0046B29C45/7613B29C45/7693B29C2045/0049B29C2945/76595B29C2945/76732B29C2945/76832
Inventor 魏佳
Owner HASCO VISION TECHNOLOGY CO LTD
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