The article presents an innovative method of forming hollow rail axles by cross rolling (CR) in a 3-roll mill. Assessing the correctness concept was conducted with numerical simulations Forge® NxT v.3.0. In order to investigate whether limitation form material cracking would occur analysed process critical values damage function for 42CrMo4 grade steel were determined. A new calibrating test, b...

In the cold rolling mill, coil breakage that generated in rolling process makes the various types of troubles such as the degradation of productivity and the damage of equipment. Recent researches were done by the mechanical analysis such as the analysis of roll chattering or strip inclining and the prevention of breakage that detects the crack of coil. But they could cover some kind of breakag...