Method for making a piston body
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United States of America Patent
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Dec 25, 2007
Grant Date -
Aug 4, 2005
app pub date -
Mar 28, 2005
filing date -
Sep 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for producing a one-part piston body for a piston-cylinder arrangement, in particular a shock absorber piston, is disclosed. The method may include in a first step, pressing a green compact comprising a revolving web and longitudinal support webs from a sinterable metallurgical powder. In a second step, the green compact may be sintered to form a blank. In a third step, radially disposed stamping tools may be used to form, under material displacement, transverse grooves into at least a part of the support webs through cold deformation. In a fourth step, the blank provided with transverse grooves may be calibrated to its final form through pressing with calibrating tools.
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