When steel blanks are formed from a forging or hot-rolling process, they generally have surface imperfections like microcracks or discontinuous "skins" that are formed during the cooling process. Metal oxide layers can also build up over time. These imperfections have to be removed before the blank can be formed into a sufficient raw material for further processing.
The raw stock can be later machined into finished pieces such as axles, piston rods, or extrusion blanks for manufacturing plastic tube. In all of these cases, it's important to have a completely smooth, defect-free continuous surface with precise dimensions. That's where the bar peeling process comes into play. It produces the smooth surfaces and critical dimensions for downstream parts processing.
High-speed centerless turning machines remove scale, cracks, seams, deformations, decarborized layers, and other imperfections resulting from hot rolling or other processes used for producing bar or tube.