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METHOD FOR PRODUCING A PISTON FOR AN INTERNAL COMBUSTION ENGINE AND PISTON PRODUCED BY SAID METHOD

  • US 20160281637A1
  • Filed: 03/18/2014
  • Published: 09/29/2016
  • Est. Priority Date: 03/18/2013
  • Status: Active Grant
First Claim
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1. A method for producing a piston for an internal combustion engine, comprising the steps of:

  • a) producing a piston main body from a first blank via a deformation process, wherein the piston main body includes a combustion depression having a dome, a plurality of piston bosses together defining at least two boss bores, the plurality of piston bosses connected to one another view a running surface, and wherein the combustion depression includes a welding surface radially on an outside with respect to a piston central axis;

    b) producing a piston ring part from a second blank via at least one of a deformation process and a casting process, wherein the piston ring part includes a piston crown, an annular fire land and an annular ring section, and wherein the piston crown has a welding surface radially on an inside with respect to the piston central axis;

    c) pre-machining the first blanks and the second blank, and finish machining the welding surfaces of the combustion depression and the piston crown;

    d) connecting the pre-machined first blanks of piston main body and the pre-machined second blank of the piston ring part via a welding process to form a piston body, wherein the piston main body and the piston ring part together define an annular cooling duct; and

    e) performing at least one of a secondary machining and a finish machining of the piston body to produce the finished piston;

    wherein during step a), a contour of the combustion depression outside of a dome region is formed to completion, and an excess material deposit is disposed in the dome region of the combustion depression, and wherein step e), further includes removing an amount of the excess material deposit in the dome region of the combustion depression to define a predetermined volume of the combustion depression.

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