在对冷拔钢管进行生产处理过程中，一般也要进行一定的变形处理，才能在后续的应用过程中进行更好的使用，那么在对冷拔钢管是如何进行变形处理的呢?当凸模下降与冷拔无缝钢管接触时，冷拔钢管起首弯曲，在凸模圆角部位材料发生胀形变形并发生硬化。凸模继续下降，此时，冷拔无缝钢管有两种变形的可能，一是凸模底部坯料在两向拉应力感化下发生伸长变形，概况积增添，厚度减薄，即胀形变形;二是法兰部门坯料在切向压应力、径向拉应力感化下，经由过程凹模圆角向直壁的流动，概况积削减，厚度增添，即拉深变形。
In the production process of cold-drawn steel pipe, it is generally necessary to do some deformation treatment in order to make better use in the subsequent application process. Then how to do deformation treatment for cold-drawn steel pipe? When the punch drops and contacts with cold-drawn seamless steel pipe, the cold-drawn steel pipe bends at the beginning and at the rounded corner of the punch. Expansion and hardening occur in the site material. There are two kinds of deformation possibilities for cold-drawn seamless steel pipe when the punch continues to drop. One is that the blank at the bottom of the punch will elongate under two-way tension stress, the general product will increase and the thickness will decrease, i.e. the bulging deformation; the other is that the blank at the flange sector will straighten through the round corner of the concave die under tangential compressive stress and radial tension stress. The wall flow, general area reduction, thickness increase, that is, deep drawing deformation.
当冷拔钢管拉深变形阻力与胀形变形阻力相那时，底部的胀形将与法兰处的拉深同时进行。若拉深变形阻力小于胀形变形阻力，底部和壁部的坯料将不再发生变形，法兰处的坯料向直壁转移形成筒壁，拉深变形得以顺遂进行，直至变形竣事。若拉深变形阻力年夜于底部或缝部胀形变形阻力，则将发生胀形变形。
When the deformation resistance of cold-drawn steel pipe is equal to that of bulging deformation, the bulging at the bottom will proceed simultaneously with the drawing at the flange. If the drawing deformation resistance is less than the bulging deformation resistance, the blank at the bottom and the wall will not deform. The blank at the flange will transfer to the straight wall to form the cylinder wall, and the drawing deformation will proceed smoothly until the deformation is completed. If the deformation resistance in deep drawing is greater than that in bottom or joint, the bulging deformation will occur.
因为冷拔钢管胀形变形水平有限，是以这种变形体例的改变意味着分裂的起头。是以，正常的拉深过程是弯曲、胀形、拉深的变形过程。不然，则为弯曲、胀形、拉深、胀形、分裂的过程。弯曲变形在拉深过程中始终存在。胀形变形或是存在于变形初期，或是存在于加工的全过程，或是与拉深变形瓜代进行直至变形竣事或零件开裂。
Because the expansion deformation level of cold-drawn steel tube is limited, the change of deformation means the beginning of splitting. Therefore, the normal drawing process is the deformation process of bending, bulging and deep drawing. Otherwise, it is a process of bending, bulging, drawing, bulging and splitting. Bending deformation always exists in the process of deep drawing. Bulging deformation exists either in the initial stage of deformation, or in the whole process of processing, or in the process of substitution with deep drawing deformation melon until the end of deformation or cracking of parts.
在对冷拔钢管进行加工处理的过程中也是比较容易出现一些弊端的，所以这就要求我们在冷拔钢管进行生产的过程中需要注意了，尽量较少一些缺陷的发生。
In the process of processing cold-drawn steel pipe, there are also some drawbacks, so it requires us to pay attention to the production process of cold-drawn steel pipe and try to reduce the occurrence of some defects.
