METHOD OF MANUFACTURING PISTON FOR INTERNAL COMBUSTION ENGINE, AND PISTON FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a piston for an internal combustion engine capable of easily positioning a pipe member, reducing materials to be used, and providing a structure with high cooling effect. SOLUTION: The pipe member 21 cast in a piston comprises a pipe body part 22 and a flange part 23 formed in a flange shape from the radial outer portion of the body part 22. These parts are formed of a same metal material. Next, the pipe member 21 is immersed in an aluminum molten metal with the same composition as the body of the piston 10 to form film on the surfaces of the pipe body part 22 and the flange part 23. The pipe member 21 is placed with the flange part 23 placed on a step part 31b formed on the inner peripheral surface 31a of an outer mold 31 and positioned in a casting mold 30. Then, aluminum molten metal is poured into the casting mold 30 to form a piston intermediate body in which the pipe member 21 is cast, and the outer surface of the piston intermediate body is machined and polished to form the outline of the piston 100. COPYRIGHT: (C)2007,JPO&INPIT