文档介绍：工艺注塑手册
Injection process handbook
基本理念：
Basic opinion:
什么是最佳的流动状态：
What is the best flow state:
流体流动状态应该是喷泉状的，最佳的流动状态是流体前端的流动速度在型腔内处处相等。由于流动方向上截面积的不同，在其变化的位置应进行注射速度的调节
（注意：机床上所能设定的注射速度是指螺杆的前进速度）。
The flow state should be like fountain, and the best is that the speed of the front melt is the same everywhere in the cavities For different areas in the direction that is vertical with the flow way, we must adjust the injection speed
(Attention: The injection speed, which we can set on the machine, is the screw forward speed)
什么是最佳的压力,温度分布状态：
What is the best pressure and temperature state:
最佳的压力和温度分布状态是压力和温度分布在型腔内部处处相等，并且随着熔体地逐步冷却而下降并使最终产品的内应力为零。
The best pressure and temperature state should be like this that the pressure and temperature everywhere in cavities are the same, and make the force of the part inside be zero finally as the melt solidified
实际压力分布状况是浇口附近最大并随着距离的增加而降低。
（记住：螺杆头处的熔体和流动着的熔体前端存在压力差是使熔体发生流动的根本原因）
The actual pressure around the gate is the highest and as the distance goes it’s getting lower and lower。
(Remember: It’s the pressure in front of the flowing melt is lower than in cylinder that makes the melt flow)
所以,综合来讲,参数设定的一般准则:
尽量选用高的注射速度(螺杆前进速度)
尽量选用高的料筒温度
尽量选用高的模具温度
So the general principles when setting parameters are:
As fast injection speed as possible (Screw forward speed)
As high cylinder temperature as possible
As high mold temperature as possible
基本概念：
Basic conception:
收缩：
Shrinkage:
（1）收缩的原因：a热胀冷缩；
b熔体结晶；(结晶度越高，熔体收缩越严重)
c分子取向；（一般来说，分子总是沿着流动方向取向的。对于未增强型材料，其熔体在流动方向上的收缩总是大于垂直方向；对于增强型材料，正好相反）
d状态变化
The reasons of shrinkage: a Chang from hot to cold;
b Crystallization ;( The more crystallization, the more shrinkage)
c Molecule orientation;
(For non-strengthen material, the shrinkage in the flowing direction is more than that, which is vertical with the flowing direction; and for the strengthen material, the result is just reverse,)