太经典了：模具设计｜注塑成型不良的原因及改善对策你知道吗？
作为模具设计工程师，在跟模及试模时经常会看到产品注塑成型不良现象，虽然注塑不良是由调机人员来改善，但做为一名有经验的结构设计工程师，还是得了解一些常见的注塑成型不良问题及其改善对策的!模塑缺点和反常现象最终集中在注塑制品的质量上反映出来。注塑制品的缺点可分成下列几点:https://p3-sign.toutiaoimg.com/pgc-image/5d28804c96c94d11a257f54590a29dc2~tplv-tt-large.image?x-expires=1978636808&x-signature=2ben1GQnUk9Bt3gG4mcyilH7JFo%3D
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(1)产品注射不足:
(2)产品溢边;
(3)产品凹痕和气泡:(4)产品有接痕;(5)产品发脆;(6）塑料变色:
(7)产品有银丝、斑纹和流痕:;(8)产品浇口处混浊:
(9)产品翘曲和收缩;(10)产品尺寸不准确;(11）产品粘贴模内;(12）物料粘贴流道;(13）喷嘴流涎。
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下面一一叙述其产生的原因及克服的办法。
1.怎样克服产品注射不足?产品注料不足往往由于物料在未充满型腔之前即己固化,当然还有其他多种的原因。
(l设备原因:
①料斗中断料;
②料斗缩颈部分或全部堵塞:③加料量不够;
④加料控制系统操作不正常:注压机塑化容量太小:设备造成的注射周期反常。⑵注塑条件原因:
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1注射压力太低:
在注射周期中注射压力损失太大:③注射时间太短;
④注射全压时间太短:注射速率太慢;模腔内料流中断;⑦充模速率不等:
⑧操作条件造成的注射周期反常。
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