注塑模具设计外文文献和翻译 Abstract
Gas-assisted injection molding (GAIM) process, that can be used to provide a hollow shape in a molding, is a variant of the conventional
injection molding process. GAIM has many advantages such as reduction of material, sink mark, warpage, and lower injection pressure.
Thus, GAIM has been widely applied in the industry to make moldings with a hollow channel such as handles, TV frames and so on. On
the other hand, GAIM has some disadvantages such as slow cooling time and flow marks. In the disadvantages, hot gas core causes slow
cooling of a molding and post-warpage.
To solve these problems, we devised a new GAIM process that has been called the reverse gas injection molding (RGIM). The RGIM
has two special units; one is the overflow buffer, which is used for reduction of a material, and the other the air unit, which is used for faster
cooling of a molding. Through experiments verifying the efficiency of the cooling in the RGIM process, it was found that the efficiency of
the RGIM process was approximately 50% better than the conventional GAIM process. Also, this experimental result was confirmed in
the numerical calculations and CAE simulations.
© 2004 Elsevier B.V. All rights reserved.
Keywords: Gas-assisted injection molding (GAIM); Reverse gas injection molding (RGIM); Air unit; Overflow buffer
1. Background on gas-assisted injection molding
Injection molding represents the most important process
for manufacturing plastic parts. It is suitable for mass pro-
ducing articles, since raw material can be converted into a
molding by a single procedure [1]. According to Rosato [2],
1986, approximately 32% by weight of all plastic parts are
manufactured by the injection molding process. Injection
molding is widely used in the manufacture of a variety of
plastic components in consumer and commercial products.
Recently, an innovative injection molding process, called
gas-assisted injection molding (GAIM) 本文来自辣%文~论!文\网，毕业论文 www.751com.cn 加7位QQ324~9114找原文[3,4], was developed
for producing parts with hollow shapes. The GAIM pro-
cess has been known for more than 25 years. The original
idea of GAIM came from the so-called “injection blowing”
method, which is widely used, particularly for the fabrica-
tion of bottles and other relatively small hollow bodies. The
use of pressurized gas for a conventional plastic injection3447
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