Patent ID: 8528206
Filing Date: 2013-09-10
Classification: B21K,Y10T

Abstract:
1. A method for a production of a piston for an internal combustion engine, comprising the following steps: forging an upper piston part made of tempered steel, which wherein the upper piston part comprises: forming an upper part of a cooling channel between the ring wall and the ring-shaped support, producing a lower piston part made of steel, using a forging or casting method, wherein said lower piston part comprises: welding of the upper piston part to the lower piston part by way of contact surfaces that enter into contact with one another, of the ring wall and the ring rib, and of the support and the contact part, whereby the cooling channel formed by the upper piston part and by the lower piston part is closed, finishing the piston using a chip-cutting production method, wherein for production of the upper piston part, an upper piston part blank is forged using a semihot-forming method, at 600° C. to 900° C., after which the combustion bowl or the upper part of the cooling channel undergo no further processing, and after which the radially outer region of the piston crown, the radially outer region of the ring wall, the lower region of the inner surface of the ring wall, and the contact surface of the support of the upper piston blank are finished to produce the upper piston part.