This paper analyzes the property of several punch machine materials, determines the material selection according to their advantages and shortcomings.

分析介绍了几家冲压机床机身材质的性能，并通过分析其优缺点，论述了如何确定机床机身的选材。

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The paper mainly introduces the purpose, the significance, the hardware components and software designs of the dynamic testing system design of the punch machine.

介绍了冲压机动态测试系统研究的目的、意义及系统硬件组成和软件设计。

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This paper brings up the research on the punch machine protecting technology based on computer image processing from a different point of view from other research methods.

本文提出了与之不同的方法对操作人员进行保护，即基于计算机图像处理的冲压床安全保护技术研究。

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The lady who ran the key punch machine was a highly qualified technician.

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