PURPOSE: To obtain easily a piston dispersed with a reinforcing material such as inorg. fibers or the like only in the surface part by a centrifugal casting method by disposing the reinforcing material on the inside circumferential surface of a casting mold, putting a light alloy which is a base material thereon then heating and rotating the mold.
CONSTITUTION: A reinforcing materil consisting of inorg. fibers 2 or metallic powder is disposed on the inside circumferential surface of a casting mold 1, then a light alloy 3 which consists essentially of Al and Mg and is a base material is put in the form of a molten metal or solid into the mold. Such mold 1 is heated to 700W900°C to melt the alloy 3 and a cover 5 having a recess 5a is fixed thereto. The mold 1 is then rotated by 1,000W3,000G centrifugal force and thereafter a piston 6 is taken out after cooling and solidifying. The reinforcing material of the fibers 9 and metallic powder 9a is dispersed only in the surface part of the base material 3 of the piston 6 by the above-mentioned method, by which the product having excellent wear resistance is obtd. at a low cost.
| JPH0637074 | [Title of Invention] Coating Cylinder- |
ISHII MASAMI
OKA TETSUO
