Patent ID: 7127813
Filing Date: 2006-10-31
Classification: B21K,B23P,F02B,F02F,F16J,Y02T,Y10T

Abstract:
1. A method for the production of pistons having depression edge armoring for internal combustion engines, comprising the steps of: setting a first piston blank onto a projection of an armoring ring, in a region of a depression edge of the piston blank; connecting the armoring ring with the first piston blank in the region of the depression edge by friction-welding; setting a second piston blank onto the armoring ring in such a manner that the two piston blanks do not touch; connecting the second piston blank with the armoring ring in the region of the depression edge, by friction-welding to form a piston; cutting the armoring ring between the piston blanks, and shaping the pistons, wherein the depression edge region of the forged piston blanks is provided with a conical incline that increases radially to the outside, relative to a piston diameter, and wherein the faces of the armoring ring are structured conically, with mirror-image symmetry relative to one another, and have the same incline as the depression edge region of the piston blanks.