PROCESS FOR SURFACE HARDENING OF A STEEL COMPONENT, HARDENED STEEL COMPONENT, AND BEATER FOR A HAMMER MILL

摘要

A method of case-hardening a steel component, such as a beater 13 for a hammer grinding machine, comprises forming in part of the surface to be hardened a plurality of holes 20 before subjecting the component to the case-hardening process whereby, during the case-hardening process, the interior surfaces of the holes 20 are hardened, to the normal case-hardening depth, in all directions into the body of the component. There is thus formed a carburised "island" around each hole, and the effect is as if the component had been case-hardened to a depth equal to a depth of the holes in addition to the normal case-hardening depth. IMAGE