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how to solution injection molding parts 凹陷?
has 时候经 processing injection molding product 会出现 shrinkage 凹陷情况, this is how 一回事? formed this 情况 都 has which 呢? 
1. machine 台方面 射嘴孔太 large formed melt material 回流而出现 shrinkage, small retardant force large material amount 不足出现 shrinkage. clamping force 不足造 formed flash 也会出现 shrinkage, 应检查锁模 system is has issues. 塑化 amount 不足应 selection amount large machine 台, screw and material is abrasion loss.
2. mold 方面
made parts design need make thick uniform, ensure shrinkage 一致.
mold cooling, add temperature system need ensure separation temperature degree 一致.
浇注 system need ensure 通畅, retardant force can large, runner, separation runner, gate dimensions need 适当, light degree need 足够, need 圆弧 渡.
for thin parts improve/increase temperature degree, ensure material 流畅顺, for thick made parts reduce mold temperature.
gate need for 称开设, amount in made parts thick 壁部位, increase cold material 井容积.
3. plastics 方面
crystallization property plastics ratio non crystallization property plastics shrinkage 厉害, processing need increase material amount, or in plastics in add nucleating agent, add fast crystallization, decrease/reduce shrinkage 凹陷.
4. processing 方面
material temperature degree high, 容积变化 large, especially is front temperature degree, for flow property plastics 应适当 improve/increase temperature degree, ensure 畅顺.
injection pressure, speed degree, back pressure low, injection time short, make material amount or density 不足而 shrinkage pressure, speed degree, back pressure large, time long formed flash 而出现 shrinkage.
add material amount 即缓冲垫 large consumption injection pressure, small 时, material amount 不足.
for/regarding requirements degree made parts, in injection holding pressure 完毕, outer basic cold hard 化而夹心部份尚 soft/flexible also can ejection made parts, and 早出模, let its in gas or hot water in slow cooling, can make shrinkage 凹陷平缓而不 that 么显眼 also effect/influence use.
