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注塑模具出现的问题及原因分析!
(1)顶出要平衡,如顶杆数量、截面积要足够,脱模斜度要足够,型腔面要有足够光滑,这样才防止由于外力导致顶出残余应力集中而开裂。   (2)制件结构不能太薄,过渡部份应尽量采用圆弧过渡,避免尖角、倒角造成应力集中。   (3)尽量少用金属嵌件,以防止嵌件与制件收缩率不同造成内应力加大。   (4)对深底制件应设置适当的脱模进气孔道,防止形成真空负压。   (5)主流道足够大使浇口料未来得及固化时脱模,这样易于脱模。   (6)主流道衬套与喷嘴接合应当防止冷硬料的拖拉而使制件粘在定模上。   3.材料方面:   (1)再生料含量太高,造成制件强度过低。   (2)湿度过大,造成一些塑料与水汽发生化学反应,降低强度而出现顶出开裂。   (3)材料本身不适宜正在加工的环境或质量欠佳,受到污染都会造成开裂。   4.机台方面:   注塑机塑化容量要适当,过小塑化不充分未能完全混合而变脆,过大时会降解。 (1) the ejection must be balanced, for example, the number and area of the ejector must be enough, the inclination of the ejection must be enough, the cavity surface must be smooth enough, so as to prevent the cracking due to the external force leading to the residual stress concentration. The structure of (2) can not be too thin, and the transition part should be used as a circular arc to avoid the stress concentration caused by the sharp angle and the chamfering. (3) can not use metal inserts as much as possible in order to prevent the increase of internal stress caused by the different shrinkage ratio of the embedded parts and the parts. (4) should set appropriate demoulding intake channels for deep bottom parts to prevent the formation of vacuum negative pressure. (5) main channel is enough for the ambassador's gate to die when it has not been cured, so it is easy to die. The joint of the (6) main channel bushing and the nozzle should prevent the drag of the cold hard material to make the parts stick to the fixed mold. 3. material aspect: the content of (1) regenerated material is too high, which causes the strength of the parts to be too low. The humidity of (2) is too large, which causes chemical reaction of some plastic and water vapor, reducing the strength and cracking at the top. (3) material itself is not suitable for the processing environment or poor quality, and the contamination will cause cracking. 4. platform: the plasticizing capacity of injection molding machine should be appropriate, too small plasticizing is not fully mixed and brittle, and will degrade when it is too large.

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  1. 名称:保定市检查井模具厂
  2. 电话:xxx
  3. 手机:13313028229
  4. 邮箱:xxx
  5. 地址:xxx

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