Steam type highlight and traceless injection-molding and forming process for complex precise product

An injection molding process, high-gloss and non-marking technology, applied in coating and other directions, can solve the problems of affecting product surface quality, difficult to obtain quality effect, low molding yield rate, etc., to save energy and materials, seam lines and layering The effect of reducing phenomena and improving yield

Active Publication Date: 2014-03-26
海门市创豪工业设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some products with complex structures, it is difficult to obtain satisfactory quality results by the general high-gloss seamless injection molding process
Because the heating and cooling of the mold rely on water channels to quickly heat and cool the cavity and core of the entire mold. For complex and precise molds, the heating and cooling solidification rates of various points on the surface of plastic products are not consistent, and thick walls have The position of the rib is slow, and the speed is fast at the place where the wall is thin. The uneven heating and cooling of each point of the plastic product in the cavity will cause internal stress of the plastic product and seriously affect the surface quality of the product.
These will cause adverse effects such as decreased production efficiency, low molding yield, and high process costs.

Method used

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  • Steam type highlight and traceless injection-molding and forming process for complex precise product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Select PMMA material as injection material;

[0033] 2) Place the injection material in a vacuum drying oven at 90°C for 2 hours to make the humidity less than 0.04%;

[0034] 3) Before starting injection, fix the mold to the injection molding machine, and preheat the mold before closing the mold, the preheating temperature is 80℃;

[0035] 4) When closing the mold, pass the high temperature steam with a temperature of 160°C and a pressure of 0.2MPa through the optimized irregular water channel to instantly heat the mold to 110°C;

[0036] 5) After the mold clamping is completed, the injection machine injects the mold. During injection, the injection pressure is divided into three injection pressure controls, that is, 75% of the maximum injection pressure, maximum injection pressure and 50% of the maximum injection pressure. The injection stroke of the screw is divided into 3 stages. When the plastic first passes through the gate, the injection speed is 80% of the highest in...

Embodiment 2

[0040] 1) Choose PC / ABS material as injection material;

[0041] 2) Place the injection material in a vacuum drying oven at 110°C for 4 hours to make the humidity less than 0.04%;

[0042] 3) Before starting injection, fix the mold in the injection molding machine, and preheat the mold before closing the mold, the preheating temperature is 90℃;

[0043] 4) When closing the mold, pass high-temperature steam with a temperature of 170°C and a pressure of 0.3MPa through the optimized irregular water channel to instantly heat the mold to 120°C;

[0044] 5) After the mold clamping is completed, the injection machine injects the mold. During injection, the injection pressure is divided into three injection pressure controls, that is, 85% of the maximum injection pressure, maximum injection pressure and 60% of the maximum injection pressure. The injection stroke of the screw is divided into 3 stages. When the plastic first passes through the gate, the injection speed is 90% of the highest inj...

Embodiment 3

[0048] 1) Choose high-gloss ABS material as injection material;

[0049] 2) Place the injection material in a vacuum drying oven at 100°C for 3 hours to make the humidity less than 0.04%;

[0050] 3) Before starting injection, fix the mold to the injection molding machine, and preheat the mold before closing the mold, the preheating temperature is 85℃;

[0051] 4) When closing the mold, pass high-temperature steam with a temperature of 150°C and a pressure of 0.25MPa through the optimized irregular water channel to instantly heat the mold to 115°C;

[0052] 5) After the mold clamping is completed, the injection machine injects the mold. During injection, the injection pressure is divided into three injection pressure controls, that is, 80% of the maximum injection pressure, maximum injection pressure and 55% of the maximum injection pressure. The injection stroke of the screw is divided into three stages. When the plastic first passes through the gate, the injection speed is 85% of th...

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Abstract

The invention discloses a steam type highlight and traceless injection-molding and forming process for a complex precise product. The process sequentially comprises the following steps of: selecting raw materials, baking, pre-heating, combining a die, then quickly heating, adjusting speed and pressure, injecting in sections, maintaining the pressure, cooling quickly, blowing out cold air, opening the die and cleaning the die. An advanced pressure-regulation and speed-regulation staging injection process and an automatic blowing and impurity-removing technology are adopted in the invention. A special heating and cooling technology is that the shapes, the widths and the arrangement density of water passages are designed according to nonuniform heat and cold of the complex precise product in the injection-molding and forming course and the overall shape variation of the product. The steam type highlight and traceless injection-molding and forming process for the complex precise product has the advantages that the residual stress of the product is effectively decreased, various defects generated in the course of producing the plastic product are greatly reduced, the surface quality and the precision of the product are remarkably improved, and the life of the product is remarkably prolonged at the same time because the special process ensures heating and cooling rates of each part of the complex product in the injection-molding and forming course tend to be consistent.

Description

Technical field [0001] The invention relates to a plastic processing technology, in particular to a steam-type high-gloss seamless injection molding technology for complex precision products. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, the quality requirements of complex-shaped injection molded parts in communications, automobiles, medical devices, home appliances and other industries are getting higher and higher, such as product finish and precision. In order to improve the surface quality of injection molded products, a spraying process is usually used in the existing technology. Spraying is the most basic, most extensive and most effective means used in surface protection. The spraying process mainly plays the role of ensuring the anti-corrosion function and beautifying the appearance of the plastic parts. The spraying quality is directly related to the competitiveness of the product and the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/00B29C45/77B29B13/06
Inventor 景伟德翁国冲曹开元王松陈勇杨浩黄俊戎孙丽云万岳飞周明星范能王冬华贺常文
Owner 海门市创豪工业设计有限公司
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