注塑模The Injection Molding

中文译文
注塑模The Injection Molding(中文2800字,英文1800字)
1. 注塑模
尽管成型某些热固性材料的方法取得了一定的进步,但注塑模主要用来生产热塑性塑件。热固性塑料熔体在很短的时间内就固化和硬化,在从料斗箱模具型腔注入热固性塑料熔体的过程中,也会出现这种情况,这个问题一直非常难解决,注塑成型原理和铸造十分相似。注塑成型的工艺包括:首先把料斗中的粉状、粒状的塑料混合物依次输送发哦计量区和融化区,然后再注射到模具的型腔中,经过一段时间的冷却后,开模,退出成型塑件,注塑件分为手动,半自动及全自动操作。注塑模具有以下优点：(1)较高的成型速度使大批量生产成为可能；(2)为成型具有不同使用性能的热塑性材料提供了较宽的选择；(3)可以成型带有螺纹的塑件、侧向凹陷的塑件、带有侧孔的塑件以及较大的薄壁件。

英文原文
The Injection Molding
1. The injection molding
Injection molding is principally used for the production of the thermoplastic parts,although some progress has been made in developing a method for injection molding some thermosetting materials.The problem of injection a method plastic into a mold cavity from a reservoir injection molding is quite similar to that of die-casting.The process consists of feeding a plastic compound in powered or granular form from a hopper through metering and melting stages and then injection it into a mold.After a brief cooling period ,the mold is opened and the solidified part ejected.Injection-molding machine operation.The advantage of injection molding are:(i)a high molding speed adapter for mass production is possible;(ii)there is a wide choice of thermoplastic materials providing a variety of useful properties;(iii)it is possible to mold threads,undercuts,side holes,and large thin section.