Method of manufacturing a piston, tool for carrying out said method and piston thus obtained

摘要

The process involves forging an outline of a part of a piston, suitable to repel a metallic mass (18) in an annular zone while forming an embossing that makes projection in centre of a base (16) with circular contour. The embossing is pierced by a reaming intended to receive a hinge pin of a connecting rod. The forging also forms two skirt portions with a cylindrical outer surface disposed on either side of the hinge pin. Independent claims are also included for the following : (a) a tool of forging an outline of a portion of a piston (b) a piston having a part forming a sliding skirt formed by implementing the process of fabrication of the piston.