塑料注射成型工艺基础

1、l注射工艺过程注射工艺过程 l注射压力注射压力l填充模式填充模式 l浇注系统与流道平衡浇注系统与流道平衡 l冷却系统冷却系统 l应力、收缩与翘曲应力、收缩与翘曲 l常见的注塑缺陷常见的注塑缺陷 lCAE软件应用指南软件应用指南 Generic NameMelt Temperature (C/F) Mold Temperature (C/F) Min. Rec. Max. Min. Rec. Max. ABS200/392230/446280/53625/7750/12280/176PA6230/446255/491300/57270/15885/185110/230PC260/500305/5

2、81340/64470/15895/203120/248PET265/509270/518290/55480/176100/212120/248PMMA240/464250/482280/53635/9060/14080/176POM180/356225/437235/45550/12270/158105/221PP200/392230/446280/53620/6850/12280/176PS180/356230/446280/53620/6850/12270/158PVC160/320190/374220/42820/6840/10470/158SAN200/392230/446270/5

3、1840/10460/14080/176 Variable Higher injection p r e s s u r e required Lower injection p r e s s u r erequired PART DESIGNPart thickness Part surface area Variable Higher injection p r e s s u r e required Lower injection p r e s s u r erequired GATE DESIGN Gate size Flow length Variable Higher inj

4、ection p r e s s u r e required Lower injection p r e s s u r erequired PROCESSING CONDITIONS Melt temperature Part surface areaRam speed Variable Higher injection p r e s s u r e required Lower injection p r e s s u r erequired MATERIAL SELECTION Melt flow index FIGURE 1. Gate size terminologyDirect (sprue) gate Tab gate Edge (standard) gate Overlap gate Fan gate Disk