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。
This new roll shape is very effective for improving pierced quality of low plastic steel and intensifying piercing process with larger cross angle.
这种新辊型对低塑性钢穿孔质量的改善和实现大前进角强化穿孔过程都有很大意义。
Based on UBEM, the analysis Inodel for press piercing process has been established in this paper and its analytical expressions have been obtained.
采用上限元法建立了压力穿孔过程中穿孔力的分析模型并给出了解析表达式。
Two years' practice shows that the upgraded drum locking device of a piercer can fully meet the requirements of a twice piercing process and is worth wide application.
经两年多的实际使用证明，改进的穿孔机转鼓器完全能满足二次穿孔工艺要求，具有一定的推广价值。
In the cross piercing process, as the piercing precession power can not overcome the resistance force, it will lead to rear-jamming when rolling thick-wall tubes or high alloy tubes.
在斜轧穿孔过程中，由于轧件旋进力克服不了顶头的阻力，因此轧制厚壁管或高合金钢管时在穿孔后期造成后轧卡。
In the cross piercing process, as the piercing precession power can not overcome the resistance force, it will lead to rear-jamming when rolling thick-wall tubes or high alloy tubes.
在斜轧穿孔过程中，由于轧件旋进力克服不了顶头的阻力，因此轧制厚壁管或高合金钢管时在穿孔后期造成后轧卡。
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