注塑件加工工藝方面應注意的問題有很多，(包括注射機的要求)為了減少內(nèi)應力和表面質(zhì)量缺陷,在注塑工藝方面應注意以下幾方面的問題:

There are a lot of problems that should be paid attention to in the processing of injection molding parts, including the requirements of the injection machine. In order to reduce the internal stress and surface quality defects, the following problems should be paid attention to in the injection molding process.

(1)注塑件加工應選用專用螺桿、帶單獨溫控噴嘴的注射機。

 Injection molding parts should be selected with special screw and injection machine with separate temperature control nozzle.

(2)注塑件加工注射溫度在塑料樹脂不分解的前提下,一般都會采用較高的注射溫度。

Injection molding temperature is usually higher when injection temperature of plastic parts is not decomposed.

(3)注射壓力一般較高,以克服熔料黏度大的缺陷,但壓力太高會產(chǎn)生內(nèi)應力造成脫模困難和變形。

The injection pressure is generally high to overcome the defect of high viscosity of the melted material, but too high pressure will cause internal stress to cause the difficulty and deformation of mold release.

(4)注射速度在滿足充模的情況下,一般宜低,最好能采用慢一快一慢多級注射。

The injection speed is generally lower than that of mold filling. It is best to use slow, fast, slow, multi stage injection.

(5)保壓時間和成型周期在滿足產(chǎn)品充模,不產(chǎn)生凹陷、氣泡的情況下,宜盡量短,以盡量減低熔料在機筒停留時間。

The holding time and molding cycle should be as short as possible to minimize the residence time of the melt in the cylinder when the mold is filled, and no dents or bubbles are formed.

(6)螺桿轉(zhuǎn)速和背壓在滿足塑化質(zhì)量的前提下,應盡量低,防止產(chǎn)生降解的可能。

The screw speed and back pressure should be as low as possible to meet the possibility of degradation under the premise of satisfying plasticizing quality.

(7)注塑件加工制品的冷卻好壞,對質(zhì)量影響極大,所以模具溫度一定要能精確控制其過程,有可能的話,模溫宜高一些好。

The cooling of the processed products of the injection molded parts has a great influence on the quality, so the mold temperature must be able to control the process accurately. If possible, the mold temperature is better.