Experiment study on the variation of wall thickness during dieless drawing of stainless steel tube

The variation of wall thickness during tube dieless drawing for stainless steel tube has been studied by experiment. It has been put forward that the variation of wall thickness is directly proportional to the external diameter, the internal diameter, and (1−RS)1/2, where RS is the cross-sectional reduction ratio of the tube. It has been found that for thin wall tube dieless drawing, there exists the relation: tf/t0=Dif/Di=D0f/D0=(1−RS)1/2; whilst for thick wall tube dieless drawing, there exists the relation: tf/t0=k1Dif/Di=k2D0f/D0=k3(1−RS)1/2. With the increasing width of deformation, the value of the variation in wall thickness and the derivative of wall thickness variation (tf/t0) to width of deformation reduces.