Tests are made with three different piercing plug cone shapes to identify shell gauge changes during secondary piercing process.
采用三种不同穿轧锥形状的顶头，通过二次穿孔试验研究了毛管壁厚变化。
According to the characteristics of the part, proposed piercing process with concave die. Introduced die structure and working process.
根据该零件特点，提出了采用有凹模冲孔加工，并介绍了模具结构及工作过程。
The piercing process of seamless steel tube is a hot working process, the distribution of plug temperature is very important to its service life.
无缝钢管的穿孔过程是一个热加工过程，顶头的温度分布对于其寿命至关重要。
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