Method, production line, and piston blank used for the production of a monolithic piston for combustion engines, and piston for combustion engines
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United States of America Patent
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Nov 5, 2013
Grant Date -
Jan 15, 2009
app pub date -
Jul 18, 2006
filing date -
Aug 29, 2005
priority date (Note) -
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Abstract
A method and a manufacturing line allow for the manufacture of piston blanks of dimensions close to the final dimensions, which in the course of subsequent finish-machining need only be machined with removal of material to a small degree. A piston shaft of the piston blank is produced by backward extrusion. At least one hollow throat element is already produced at the piston blank by an upset-forging operation. For this purpose, a special forging tool is provided, which, after the manufacture of the piston shaft, takes effect on the piston blank in such a way that at least one hollow throat element is formed at the latest at subsequent forming of the piston base. In this way, a perceptible reduction is achieved in the weight of a piston in relation to conventionally manufactured forging pistons.
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