本文用密栅云纹法测量了拉拨过程中金属在变形区内的流动情况,将变形区划分为三个区域,发现金属在入口模具接触面附近有一个三向受压状态的“负位移区”。在相同减面率情况下,用圆坯“一次成型”冷拔六角钢其等效应变较拉拔圆棒时要均匀得多,这有利于提高六角钢的产品质量。 In this paper, the flow of metal in the drawing zone is measured by using the dense grille moiré method. The deformation zone is divided into three zones. It is found that there is a “negative displacement Area”. In the same reduction rate, using round billet “once forming” cold drawn hexagonal equivalent strain is much more uniform than drawing the round bar, which is conducive to improving the quality of the hexagonal steel.