Method for producing a piston

Abstract

The invention relates to a method for producing a piston (1) for an internal combustion engine from a piston upper part (2) and a piston lower part (3), comprising the following steps: producing the piston upper part (2) by, for example, forging or casting, said piston upper part (2) having a piston crown (6), at least a part of an annular part (12) and at least a part (7) of a cooling channel (8); producing the lower piston part (3) by a superposition method and closing the part (7) of the cooling channel (8) arranged in the upper piston part (2); finishing the piston (1) comprises the production of at least one annular groove (4) for receiving a piston ring in an annular support (5). The piston (1) produced on the basis of the above method has a greater strength in the piston upper part (2) subjected to high heat and mechanical loads than in the piston lower part (3) subjected to low heat and mechanical loads, and allows a greater degree of freedom of production with respect to the shape of the piston lower part (3).

Description

technical field [0001] According to the preamble of claim 1 , the invention relates to a method for producing a piston in an internal combustion engine from a piston upper part and a piston lower part. The invention also relates to a piston produced by this method. Background technique [0002] WO 2014 / 165734 A1 discloses a method of producing a piston of the type in question, in which a piston lower part with a piston skirt and a piston pin-hole boss is cast or forged, and the piston upper part is subsequently produced based on this by a superposition hardening method. [0003] WO 2015 / 134424 A1 discloses a method for producing a piston in which a piston body with a ring, a piston skirt and a cooling channel opening towards the piston crown are cast or forged. In a subsequent method step, the cooling channel, which is initially open towards the piston crown, is closed by superposition. [0004] WO 2018 / 063863 A1 again discloses a method for producing a piston, in which in...

AI Technical Summary

Problems solved by technology

[0005] However, a disadvantage of the known piston is that, in particular, the regions of the piston that are subjected to high thermal and mechanical loads during subsequent operation are produced by the superposition method, which can lead to question

In order to compensate for these disadvantages, the pistons are generally designed to be stronger in the superimposed manufactured parts, but this causes an increase in weight and therefore also fuel consumption in subsequent operation

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