Hard sintered component and method of manufacturing the same.

摘要

In order to manufacture a hard sintered component of a cemented carbide or a alloy corresponding to stellite having a complex shape with a three-dimensional curved surface, a small hole or the like as well as high strength originally provided in the material therefor through no secondary working such as electric discharge machining nor other machine work, a compact is injection-molded into a molding die having an inner peripheral surface of not more than 3 mu m in surface roughness Rmax and/or a core pin whose outer peripheral surface is not more than 3 mu m in surface roughness Rmax, and then sintered. The hard sintered component is composed of a cemented carbide or a alloy corresponding to stellite. In such a hard sintered component, the surface of a three-dimensional curved surface such as a disc portion or a thin portion, or the inner peripheral surface of a small hole is defined by a sintered surface which is not more than 4 mu m in surface roughness Rmax. <IMAGE>