Method for making a piston body

Details Method for making a piston body Method for making a piston body

2007-12-25

2007-12-25

Hong, John C. (Department: 3726)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C188S322220

Reexamination Certificate

active

11091246

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.

REFERENCES:
patent: 3212411 (1965-10-01), Storms
patent: 4483820 (1984-11-01), Schelb
patent: 4707351 (1987-11-01), Lord et al.
patent: 2004/0175285 (2004-09-01), Hattori et al.
patent: 198 47 342 (2000-08-01), None
patent: 101 08 246 (2002-09-01), None
patent: 0 682 190 (1998-04-01), None
patent: 0 658 611 (1999-09-01), None
patent: WO 00/34681 (2000-06-01), None

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