PURPOSE: To increase the surface sticking hardness between a Cu-applied layer and a Fe-applied layer by preliminarily applying powder adhering liquid on the area which faces to the friction face of a bearing, filling the Cu powder and the Fe powder, compressing and shaping them.
CONSTITUTION: Powder adhering liquid R which incurs no adverse effect in the sintering is applied on the external face of the end part of a core rod 12 projecting from a lower punch 13. Next, Cu powder is sprayed against the applied adhering liquid R to form an extremely thin Cu coat on the external face of the end part of the core rod 12. Then, the core rod 12 and lower rods 13 are pressed down integrally and each of the spaces defined by the external face of the end part of the core rod 12, the upper face of the lower punch 13 and the internal face of a die 11 is filled with Fe powder. The Cu coat can then be made thin to the desired degree and the surface sticking forces of both the Cu coat and the Fe coat can be increased.
KANEZAKI NOBORU
WATANABE YUJI
