Application of Irregular Roller Burnishing in the Shaft Straightening Process - Experimental and Numerical Study

摘要

This article presents the technology used for straightening large-dimension shafts through irregular burnishing. Irregular burnishing is performed on part of the cylindrical surface while the opposite surface is not burnished. The aim of straightening technology is to introduce squeezing stresses on the shaft surface, which cause the straightening and the increase in fatigue durability of this area. The significant parameters in the process of shaft straightening include: the depth δ of the plastically deformed surface, which determines the size of the squeezing stresses introduced in the surface layer and the length h of the burnished surface. This article presents the calculation method for the depth δ of a surface that is plastically deformed in the process of burnishing, as well as its experimental verification. The numerical modelling of roller burnishing has been carried out using the finite element-based MSC.Marc program. The method for the identification of the length of the burnished surface for straightening a shaft with a curvature f is described. The methodology is used to straighten a large-dimension shaft with a diameter of 292 mm and length of 3700 mm.