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注塑件加工工艺方面应注意的问题有哪些?
文章出处:http://wxxykhb.com人气:324发布日期:2019-12-16
注塑件加工工艺方面应注意的问题有很多,(包括注射机的要求)为了减少内应力和表面质量缺陷,在注塑工艺方面应注意以下几方面的问题:
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)注塑件加工应选用专用螺杆、带单独温控喷嘴的注射机。
 Injection molding parts should be selected with special screw and injection machine with separate temperature control nozzle.
(2)注塑件加工注射温度在塑料树脂不分解的前提下,一般都会采用较高的注射温度。
Injection molding temperature is usually higher when injection temperature of plastic parts is not decomposed.
(3)注射压力一般较高,以克服熔料黏度大的缺陷,但压力太高会产生内应力造成脱模困难和变形。
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)注射速度在满足充模的情况下,一般宜低,最好能采用慢一快一慢多级注射。
The injection speed is generally lower than that of mold filling. It is best to use slow, fast, slow, multi stage injection.
(5)保压时间和成型周期在满足产品充模,不产生凹陷、气泡的情况下,宜尽量短,以尽量减低熔料在机筒停留时间。
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)螺杆转速和背压在满足塑化质量的前提下,应尽量低,防止产生降解的可能。
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却好坏,对质量影响极大,所以模具温度一定要能精确控制其过程,有可能的话,模温宜高一些好。
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.
   

   


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