材料期刊网

The variation of wall thickness during tube dieless drawing for stainless steel tube has been Studied by experiment. It has been put 1 2 forward that the variation of wall thickness is directly Proportional to the external diameter. the internal diameter, and ( 1 - R-s)(1/2) where R-s is the cross-sectional reduction ratio of the tube. It has been found that for thin wall tube dieless drawing, there exists the relation. t(f) /t(0) = D-if/D-i = D-Of/D-0 = (1 - R-s)(1/2); whilst for thick wall tube dieless drawing, there exists the relation: t(f)/t(0) = k(1)D(if)/D-i = k(2)D(0f) /D-0 =k(3)(1-R-s)(1/2). With the increasing width of deformation, the value of the variation in wall thickness and the derivative of wall thickness variation (t(f)/t(0)) to width of deformation reduces. (C) 2002 Elsevier Science B.V All rights reserved.