一、概述穿孔机顶头是生产无缝钢管的重要工具。顶头在穿孔时与1200～1260℃的管坯相接触,其表面温度可达1000℃左右,受热的同时还承受交变的复杂力荷负。当它穿完一根管子后,顶头表面经受骤冷,温度从1000℃降到330～440℃,然后投入水槽冷却,因此还存在热疲劳问题。顶头经过多次穿孔,一般出现的损坏情况如图1所示。从 First, an overview Piercer head is an important tool for the production of seamless steel tubes. When piercing, the head contacts with the tube of 1200-1260 ℃, the surface temperature of which can reach about 1000 ℃, and also bear the alternating complex load negative while heating. After it was put through a pipe, the head surface was quenched, the temperature was dropped from 1000 ° C to 330 ° C to 440 ° C, and then put into a sink to cool, there was also a thermal fatigue problem. The head after repeated perforation, the general situation of damage shown in Figure 1. From