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Acoustic emission technique for online monitoring during cold forging of steel components: a promising approach for online crack detection in metal forming processes

机译：用于钢构件冷锻过程中在线监测的声发射技术：一种用于金属成型过程中在线裂纹检测的有前途的方法

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摘要

The acoustic emission technique is a very promising non-destructive and online capable approach for the detection of damage events in metal forming processes. The feasibility of using this testing method for online monitoring of cold forging processes of the case hardening steel 1.7321 (20MoCr4) was experimentally proven. In this paper, exemplary upsetting tests under varying test conditions were continuously monitored to analyze the relationship between cracking and resulting AE as well as to determine ideal AE measuring parameters. Finally, the critical forming stage of an industrial cold forging process for manufacturing of drive bevel gears is examined by applying acoustic emission technique. Cracking and tool wear were detected by analyzing the distribution of the AE parameters energy, hits and amplitude over the forming process.
机译：声发射技术是一种非常有前途的无损在线功能，可用于检测金属成型过程中的损坏事件。实验证明了使用该测试方法在线监测表面硬化钢1.7321（20MoCr4）的冷锻过程的可行性。在本文中，在各种测试条件下对示例性的setting锻测试进行了连续监控，以分析开裂和最终AE之间的关系，并确定理想的AE测量参数。最后，通过应用声发射技术研究了用于制造主动锥齿轮的工业冷锻工艺的关键成形阶段。通过分析整个成形过程中AE参数的能量，冲击和振幅分布，可以检测出裂纹和工具磨损。

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