PURPOSE: To produce large-sized wear-resistant parts with a simple stage and a small-sized inexpensive device by fitting taperingly the outside flank of a sintered hard alloy in a core part and the inside flank of an outside circumferential sintered hard alloy constituted by enclosing the core part.
CONSTITUTION: The outside surface 1' of a sintered hard alloy 1 in a core part and the inside surface 2' of an outside circumferential sintered hard alloy 2 enclosing said surface are tapered. These alloys are placed on a stage 3, and the pressure by the own weight of the alloy 1 is applied on the tapered inside surface of the alloy 2. The alloys are heated in this state in a reducing or neutral atmosphere or in a vacuum by which the alloys are joined on the tapered surfaces. The joining is thus accomplished inexpensively with high joint strength without need for any jig for joining at all.
MIYAKE MASAYA
SHIYOU TADAMASA
