关于锁模力的一份文件

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【华为网盘】关于锁模力的一份文件.rar(7.16K)

几年前，在一份月刊的文章里，我的导师Bill Tobin 为一份杂志写了一篇文章，是关于锁模力的重要性，里面谈到了许多注塑员在日常工作中，经常会使用过大的锁模力。
We all know that if you don’t have enough clamp force for the projected area of the parts, flash will result. Enough clamp force is essential, but too much can be detrimental and counter productive.
我们都知道对于相应的产品投影面，如果没有足够的锁模力的话，可能会有飞边产生。足够的锁模力是必不可少的，但如果合模力太大的话，也是有害的，而且经常是事与愿违。
Too much clamp tonnage, whether it is being applied trying to correct a flash condition (Again, fix the mold!), or being applied out of a (poor) habit has its consequences. Excess clamp puts more abuse than is necessary on the press. Toggles, tie bars and platens are subjected to more mechanical abuse than is necessary. If the molding question is too small in area, platen damage can be accelerated. The platens can actually “wrap around” the tool, or hob in the center areas. Minimum mold areas for platen size should always be observed, even in minimum clamp situations. Too much clamp puts a bigger than needed load (burden) on the pumps of hydraulic machines, especially a direct-clamp hydraulic press, and even too much of a burden on the servos, and of course mechanical links of an electric press.

较大的锁模力，有的时候可以改善产品的飞边（备注：也可以通过修模改善），但同时也是一个不好的习惯。过量的锁模力，对设备是一种“虐待”。注塑机的肘杆，拉杆以及模板承受了超出额定的机械力。如果模具的尺寸相对较小的话，模板的破坏将会增加。模板可能四周变形或在中心位置产生压迫。我们经常看到的是安装尺寸较小的模具（接近最小的模具安装尺寸），然后用最小的合模力。较大的锁模力设置，需要液压泵提供较高的压力值，特别是对于直压式模板来说，或者引起伺服马达过载，和电动机的机械连接破坏。。。。。

gulinling

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