RING TYPE COOLING GALLERY MANUFACTURING METHOD OF AN INTERNAL COMBUSTION ENGINE PISTON, CAPABLE OF REDUCING DETECT IN A COOLING GALLERY FORMING PROCESS BY IMPROVING THE DIMENSION PRECISION OF A METAL TUBE WELDED TO A CARRIER RING

摘要

PURPOSE: A ring type cooling gallery manufacturing method of an internal combustion engine piston is provided to stably form the shape of a metal tube and to improve the dimension precision of a metal tube by including a bulging process which applies force between two pins in a bending process.;CONSTITUTION: A ring type cooling gallery manufacturing method of an internal combustion engine piston comprises the following steps. A thin metal plate is manufactured with a blank board(a). The central part of the blank board is drawn and manufactures to a board(b). Some part of a hat shaped plate is omitted, and a remained part is manufactured with the board of a ring shape. The board of a ring shape is manufactured with vertically extending to the same direction to a wall. The length of one part piece is longer than the length of the other part piece by controlling the dimension of the board of the ring shape. The part piece whose length is longer than the other is bent to manufacture the board of the ring shape.;COPYRIGHT KIPO 2010