Method for the production of a piston for internal combustion engines and piston for an internal combustion engine
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United States of America Patent
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Jan 31, 2012
Grant Date -
Jan 14, 2010
app pub date -
Sep 25, 2007
filing date -
Sep 26, 2006
priority date (Note) -
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Abstract
A method for producing a piston for internal combustion engines includes the following steps: a first part is pre-fabricated by hot forging and a recess which has an undercut is formed in the first part during pre-fabrication by forming on the first part a projection, to which projection a lateral force is applied to form the undercut; a second part is pre-fabricated by hot forging and a projection is formed on this second part whose dimensions are matched to the dimensions of the recess; the two parts are joined together so that the projection on one part engages in the recess in the other part; and a compressive force is applied to the two parts which is sufficiently large and so aligned that the material of the projection on one part flows into the recess in the other part and completely fills it to connect the parts by positive fit.
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