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众所周知,拔管时的变形区形状对拔制过程的应力、应力分布、摩擦条件、金属流动条件、拔制应力和拔制力等参数都有显著的影响。冷拔钢管时的变形区形状主要取决于拔模入口锥角和变形程度的大小。小的拔模入口锥角和大的变形程度对应着长而低的变形区;相反,大的拔模入口锥角和小的变形程度对应着短而高的变形区。基于上述原因,在设计拔模入口锥角时,必须同时考虑变形程度的大小。按Roger,N.Wrght的数据,将变形区高度和变形区长度的比值视为“形状
It is well-known that the shape of the deformed zone during extubation has a significant effect on the parameters of stress, stress distribution, frictional conditions, metal flow conditions, pull-out stress and pull-out force during the drawing process. Cold-drawn steel deformation of the shape of the district depends mainly on tapping angle and degree of deformation of the draft. A small draft angle and a large degree of deformation correspond to a long, low deformation zone; on the contrary, a large draft angle and a small degree of deformation correspond to a short, high deformation zone. Based on the above reasons, in the design of tapping entrance taper angle, we must also consider the size of the degree of deformation. According to Roger, N. Light, the ratio of the height of the deformation zone to the length of the deformation zone is taken as "shape