Evaluation of Coating and Wear Characteristics of Roll Surface Coated with TiC by Electrical Discharge Coating

Abstract

The surface texture of a steel sheet exerts a considerable effect on sheet press formability and image clarity after coating. Temper rolling is one of the key processes for determining the surface texture, because the final procedure is printing using an appropriate work-roll surface. To carry out stable control of the surface texture by temper rolling, it is important to maintain the topography of the roll surface and increase the roll service life for industrial use. In this study, electrical discharge coating is applied as a means of improving the wear resistance of the roll surface. First, characteristics of the film coating made by electrical discharge coating using a TiC sintered electrode are investigated experimentally. Then, the influence of the electrical machining conditions on the film thickness, hardness, and surface roughness is evaluated and discussed. Furthermore, a rolling experiment is conducted and the wear resistance was evaluated by comparison with a film fabricated by the conventional hard chromium plating method.