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无扭穿轧时，轧坯材料处于三向受压应力状态。
In non-twist piercing the rolled billet is in compression stressed condition in trip-direction.
本文论述了斜轧工具设计所应遵循的原则与三辊联合穿轧的孔型设计。
In this paper, the principles which should be adhered to when designing skew rolling tool and the pass design for three-roller combining piercing and rolling are discussed.
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。
Tests are made with three different piercing plug cone shapes to identify shell gauge changes during secondary piercing process.
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