Method and device for manufacturing pressed parts from hard metal, ceramic, sintered metal or likewise

US6074584A · kind A · utility

Assignee

• Wilhelm Fette GmbH · DE

Inventors

• Jurgen Hinzpeter · Schwarzenbek, DE
• Ingo Schmidt · Schwarzenbek, DE
• Ulrich Gathmann · Hamburg, DE
• Jörg Reitberger · Hamburg, DE
• Klaus-Peter Preuss · Eckernförde, DE
• Alexander Oldenburg · Schwarzenbek, DE
• Joachim Greve · Pogeez, DE

Key dates

• Filing date: Apr 6, 1998
• Grant date: Jun 13, 2000
• Expiry date: Apr 6, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2999/00
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method for manufacturing pressed parts from hard metal, ceramic, sintered metal or likewise, in which a part of a charge of a powder-like or granular original material is filled into a pressing mould and is pressed with at least one pressing stamp against a counter surface, wherein the force and the distance of the pressing stamp are measured, and wherein there are the following method steps: PA1 depending on the geometry of the pressed part and on the original material during the compression for a pressing stamp a desired force-distance diagram (nominal curve) is determined and stored; PA1 in a computer during the compression the measured values for the distance and the force of the pressing stamp are compared to the nominal curve; PA1 by way of at least one separately actuated section of the pressing stamp or of a separate stamp the pressure on the pressing material during the compression phase is increased or reduced as soon as a deviation from the nominal curve is determined, in order at the end of the compression phase to obtain an equal density of each pressed part.