Effect of Tensile Flow Properties of Titanium Sheets on Web-buckling Behavior in Cold Roll-forming of Wide Profile

抄録

Web-buckling, sometimes called pocket wave or oil canning, is one of the typical defects which take place in a cold roll-forming process of wide profiles. The relations between web-buckling appearance and several properties of commercially pure titanium sheets were experimentally investigated. Results showed that the grain size is most correlative to web-buckling, and that the magnitude of pocket wave tends to decrease with decreases in the grain size. The mechanism of inhibiting web-bucking in fine-grained titanium sheets is considered to be the fact that deformation must be localized at bend corners of formed profiles, as those titanium sheets reveal clear yield drop at the start of plastic flow.