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注塑加工强行脱模产生的危害

来源:http://www.jnhjgs.cn/news/19.html发布时间:2017-03-01

在整个注塑加工的成型周期中,主要是以注射时间和冷却时间最重要,它们对制品的质量均是有决定性的影响。注射时间中的充模时间直接反比于充模速率、生产中充模时间一般约为3-5秒。
In the injection molding cycle, injection time and cooling time are the most important factors, which have a decisive influence on the quality of the products. The injection time is directly proportional to the filling rate and the filling time is about 3-5 seconds.
注射时间中的保压时间就是对型腔内塑料的压力时间、在整个注射时间内所占的比例较大的、一般约为20-120秒(特厚制件可高达5~10分钟)。而在浇口处熔料封冻之前,保压时间的多少、这对制品尺寸准确性有影响,若是在以后、则是无影响的。保压时间也是有最惠值的,已知它依赖于料温,模温以及主流道和浇口的大小。如果主流道和浇口的尺寸以及工艺条件都是正常的,通常即以得出制品收缩率波动范围最小的压力值为准的。

山东模具Injection time in the pressure holding time is the plastic cavity pressure time, the proportion of the entire injection time, the general is about 20-120 seconds (special thick parts can be as high as 5~10 minutes). In the frozen melt the gate before the holding time of how much, the product size accuracy, if in the future, it is no influence. Holding time is also the most favorable value, it is known that it depends on the material temperature, mold temperature, as well as the main channel and gate size. If the size of the sprue and gate and the process conditions are normal, it is usually based on the minimum pressure value of the product shrinkage range.
冷却时间主要决定于制品的厚度,塑料的热性能和结晶性能、以及模具温等。冷却时间的终点,应以保证制品脱模时不引起变动为原则,冷却时间性一般约在30~120秒钟之间,冷却时间过长的话是没有必要、不仅降低生产效率、还会对复杂制件还将造成脱模困难,强行脱模时甚至害会产生脱模应力。
The cooling time is mainly determined by the thickness of the product, the thermal and crystalline properties of the plastic, and the temperature of the mold. The cooling time of the end point, should be to ensure that the products do not cause changes in ejection principle, the cooling time of about 30~120 seconds in between, the cooling time is too long it is not necessary, not only reduces the production efficiency, but also on the complex parts are caused by the difficulty of stripping, stripping even harm would have forced demolding stress.
本文文章来源:山东模具更多的内容请进入:http://www.jnhjgs.cn我们的官方网站
This article source: Shandong mold more content please enter: http://www.jnhjgs.cn our official website

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