大型注塑机的合模机构分析

Analysis on Clamping Mechanism of Large Injection Molding Machines

对大型注塑机负后角合模肘杆机构进行运动分析,对前、后及动模板进行结构造型及应力分析。结果表明注塑机的移模速度与油缸速度的速比与合模机构的参数有关,负后角在开模过程中无自锁角,在合模过程的移模速度具有明显的慢快慢特征,在高压锁模区移动模板的速度下降得很快,具有良好的开闭模速度特性。通过有限元分析,机构的3个模板结构得到优化。将此技术应用到公司生产的大型注塑机上,取得了较好的实际效果。

Motion analysis of negative-rear angle clamping toggle mechanism was carried out, and the stationary, rear, and moving plate structure were modeled and analyzed. The speed ratio of moving plate to clamping cylinder of the injection molding machine was related with the clamping mechanism parameters. There was no self-locking of negative-rear angle in the opening mold process, and the clamping process followed a slow-fast-slow mode. In the high-pressure clamping area,the speed of moving plate dropped very quickly. The structure of three plates was optimized through limited element analysis.