Sheet Bending Deformation in Production of Thin-Walled Pipes

Tatjana V Brovman

doi:10.4236/wjm.2014.412035

Abstract

Nowadays, thin-walled super-diameter pipes are produced by the method of plastic bending of sheets. After a sheet is bent into a pipe and its ends are welded, a pipe billet is subjected to expansion deformation. The technology of forming end areas of a sheet is developed and formulaes forming forces equations are deduced. Experimental investigations of deformation are undertaken.

Highlights

Nowadays thin-walled pipes are made of metal sheets by the method of plastic bending in terms of the required diameter with the following welding of edges by a longitudinal seam [1] [2]
Sometimes two half-cylinder billets are bent with the following welding by two longitudinal seams
Elastoplastic bending is used for production of high-strength steel pipes of super-diameter (1020 - 1420 mm and more), with the length being up to 18 metres and wall thickness to 40 - 55 mm

Summary

Introduction

Nowadays thin-walled pipes are made of metal sheets by the method of plastic bending in terms of the required diameter with the following welding of edges by a longitudinal seam [1] [2]. Near the ends of the sheets to be bent there are sections l1 (Figure 1) where plastic deformation is not possible. Since a limiting value of non-dimensional load parameter m = 1 , minimum length 4 In consideration of large pipe length (up to 10 - 12 m and more) the energy consumption will be two-three times higher due to losses The above mentioned process is used in practice which is, difficult because of the lack of experimental data on the intensity of stress for deformation in forming sheet stock end areas

Force Determination in Stock End Area Die Forming

Findings

Conclusions