Production manner of oilless bearing, and mold null for oilless bearing production

摘要

PROBLEM TO BE SOLVED: To provide an oilless bearing which uniformly forms the film of lubricant on a sliding surface without causing falling out of the solid lubricant in use and forming it in a scooped out state, by embedding plural disklike solid lubricants onto the inner wall surface of a metallic cylindrical body. ;SOLUTION: Plural bottomed holes 3 are formed on the inner wall surface of the metallic cylinder 2 formed in cylindrical shape. The disklike solid lubricant 4 of graphite, etc., is embedded into each of bottomed holes 3 to form the oilless bearing 1. In a production of the bearing 1, plural bottomed holes 9 are formed on the outer peripheral surface of a columnar body 6 formed by hardening sands by a CO₂ method, and the solid lubricant 8 is fitted into the bottomed hole 9 to form a core 5. The core 5 is fitted to core print housing parts 40, 42 having the same diameter as the core 5. This core 5 is housed in a mold 10 and molten metal is poured into cylindrical body forming parts 41, 43 in the mold 10 to insert the solid lubricant 8 fitted to the core 5 into the wall surface of the cylindrical body. After solidifying the molten metal, the core 5 is collapsed and the solid lubricant 8 protruded toward the inside of the wall surface in the cylindrical body is cut off.;COPYRIGHT: (C)1997,JPO