1.前言众所周知,顶头是斜轧穿孔工序的关键工具。顶头材质与形状设计是否合理,直接影响着穿孔机的能耗、小时产量、成材率等。目前,国内Φ76机组、ΦC0机组穿孔机使用顶头均为球面形,材质多为3Cr2W8V合金工具钢。使用该顶头穿碳素管坯、低合金结构钢管坯时,寿命问题还不十分突出,但 1. Preface As we all know, the head is the key tool for cross-rolling process. Head material and shape design is reasonable, a direct impact on the piercing machine energy consumption, hourly yield, yield and so on. At present, the domestic Φ76 units, ΦC0 unit piercing head are spherical, the material is mostly 3Cr2W8V alloy tool steel. The use of the head through the carbon tube, low alloy structural steel tube, the life of the problem is not very prominent, but