Method for making a piston body

US7310876B2 · kind B2 · utility

Assignee

• GKN Sinter Metals, LLC · DE

Inventors

• Ewald May · Bonn, DE
• Rainer Schmitt · Meckenheim, DE

Key dates

• Filing date: Mar 28, 2005
• Grant date: Dec 25, 2007
• Expiry date: Mar 28, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49249
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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.