MANUFACTURE OF BEARING

PURPOSE:To prevent the generation of mold cavity and cracks caused thereby by sending a bearing manufactured by centrifugal casting or by filling a capsule with pulverulent bearing metal in a receptacle to be subjected to high temperature and high pressure treatment. CONSTITUTION:A bearing 12 manufactured by span-in casting or a bearing constructed by filling a capsule with pulverulent bearing metal is carried in a high-pressure receptacle 11. Inert gas G such as argon gas or the like is introduced in the high-pressure receptacle 11. The inert gas G is high temperature and high pressure. The interior of the high-pressure receptacle 11 is kept in the high temperature and high pressure condition by the inert gas G and the condition is continued about one hour. In case of such centrifugally cast bearing, mold cavity causing cracks in the bearing metal is crushed so as to improve the strength of the bearing. On the other hand, in case of manufacturing a bearing from pulverulent metal, it is possible to provide a bearing metal which has dense texture, no mold cavity and high strength.