冷轧管机的生产率和轧出管材的质量,在很大程度上决定于工作工具,因此,正确制作轧管孔型模、轧管芯头是很重要的。轧管孔型模的工作状态为一对带有型槽的孔型模装在二辊式冷轧机上,背靠背做往复直线运动和摆动运动,见图1所示。因此,孔型模应具有良好的耐磨性、足够的硬度和强度、良好的抗弯性和高的弹性、韧性,并且要具有精确的几何尺寸和高的表面光洁度。 The productivity of cold rolling mills and the quality of rolled pipe are largely determined by the working tools. Therefore, it is very important to make the rolling mills and rolling mills correctly. The working condition of the rolling pipe die is a pair of die with slotted die mounted on a two-roll cold rolling mill, reciprocating rectilinear motion and swinging motion back to back, as shown in FIG. 1. Therefore, the hole die should have good wear resistance, adequate hardness and strength, good bending resistance and high elasticity, toughness, and to have a precise geometry and high surface finish.