声发射在精冲模具崩刃在线检测中的应用

The Application of the Acoustic Emission in the Online Detection of Fine Blanking Mold Chipping

经过对精冲企业的详细调研发现,在精冲过程中模具冲头主要失效形式为断裂和崩刃,其中模具冲头崩刃难以检测,造成成品率下降并且阻碍了高速精冲生产线的全自动化。通过多次试验,探索性地提出利用声发射信号检测技术在精冲模具生产线上实施在线检测的方法。介绍了声发射信号产生的基本原理、常见的分析方法以及模具冲头崩刃的发生机理,深入分析了金属板材冲压过程的声发信号。通过识别冲压过程中的声发射信号,探究了基于声发射系统在模具崩刃在线检测中的可行性。

Tremendous researches on the fine molding process in certain enterprises indicate that mold chipping is one of the most common forms of mold failures and this kind of mold failure is especially difficult to detect which will result in yield decline and hindering fully automated process in high-speed production line. Here we explored the applicability of the acoustic emission based detection technology in fine mold production line. ＂][＇he basic theories of the generation of acoustic emission in sheet metal were introduced and the method of how to analyze the signal and the mold chipping mechanism was presented. Finally, an in-depth analysis of acoustic emission in the metal sheet stamping process was proposed, trying to validate the feasibility of the acoustic emission based detecting technology in the online mold chipping.