分析了冷挤压毛坯质量对模具的工作部分（上、下凸模和凹模）的损坏形式和寿命的影响，指出了保证毛坯质量应采取的措施。
The effect of blank quality in cold extrusion on the damage way and service life of working parts (mould and die)is analysed, and some countermeasures presented.
下螺母凸顶的滑动零件上有一条小弧线充当楔块。
A small curve in the sliding part of the convex top of the lower nut acts as the wedge.
再按压一下印刷器对着签购单的色带，就可以得到凸印有相关信息的交易记录。
The record of the transaction included an impression of the embossed information, made by the imprinter pressing an inked ribbon against the charge slip.[3]
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