It is pointed that application and dissemination's key factor of piston pin's cold extruding technique in China is that working life of piston pin's cold extruding punch is too low.
明确指出妨碍活塞销冷挤压技术在国内推广应用的关键因素是其冷挤压凸模的寿命太短。
In this paper, we study the technique of cold extruding forming, and produced all kinds of the long conical pipe in that way.
采用冷挤压成形工艺方法，能生产出各种尺寸、规格的深圆锥形管件。
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