Optimum working conditions in the cross rolling of stepped shaft

摘要: Abstract The conditions resulting in the formation of a central cavity during cross rolling stepped shaft are investigated by calculating tensile stress arising at mid-point rod cross-section. Considering forming to be limited relative slipping between roller and rod, necessity avoid defects rolled products, optimum reduction cross-sectional area R op effective range angle α spreading β tool wedge for practical use proposed as follows: = (0.15 + 0.0038 α)β 0.325 1.93 −0.925 ⩾ 0.15 Mβ −0.325 where M is constant 0.35–0.40 , expressed degrees. If recent application cross-rolling process producing counter-gear — which one parts transmission gear automobiles considered, results analysis determining limits suggest points considered when designing shape selecting appropriate working conditions.