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1.前言二辊斜轧穿孔中,穿孔顶头是重要内变形工具,顶头质量好坏直接影响到毛管的质量、产量和各种消耗。就穿孔顶头参与变形的作用看,由实心管坯变成空心毛管时,内径由零扩展到要求值,这种变形主要靠顶头来完成。高温、高压、强烈摩擦和急冷、急热反复交变等极为恶劣的作用条件,使顶头很快熔化磨损而报废,其比例占70～80％。其中有的顶头鼻部熔化时由于受到挤压,向内孔方向挤出一条长长的金属尾巴;有的鼻
1. Introduction Two roll oblique piercing perforation, piercing the head is important within the deformation tool, the quality of the head directly affects the quality of the capillary, yield and various consumption. The role of perforation to participate in the deformation of the head look, from solid tube into a hollow tube, the diameter expansion from zero to the required value, this deformation mainly by the head to complete. High temperature, high pressure, strong friction and rapid cooling, rapid repeated alternating hot and other extremely adverse conditions, the head quickly melted wear and scrap, the proportion of 70 to 80%. Some of the top nose melted due to being squeezed, the extrusion of a long metal tail hole direction; some nose