Surface Wave Based Ultrasonic Technique for Finding the Optimal Grinding Condition of High Speed Steel (HSS) Work Rolls

摘要

Over the last few years, the use of work rolls for hot rolling of flat steel has been changed from clear chill rolls to indefinite chill, then high chrome steel and now high speed tool steel (HSS). HSS rolls are highly crack-sensitive because of its high surface hardness. The crack propagation develops within the working surface of the roll, gradually increases in depth and width followed by a large "cats-tongue" band type spalls of the overlying barrel surface and that leads to abnormal roll failure. This paper presents the development of surface wave based ultrasonic technique to optimize the grinding procedure for having crack free roll surface.