Method and apparatus for minimizing the spread of maximum compression forces in a powder press

US7147820B2 · kind B2 · utility

Assignee

• FETTE GMBH · DE

Inventors

• Jurgen Hinzpeter · Schwarzenbek, DE
• Ulrich Zeuschner · Schwarzenbek, DE
• Ingo Schmidt · Schwarzenbek, DE
• Thomas Pannewitz · Klein Pampau, DE
• Udo Baltruschat · Hamburg, DE
• Thorsten Ehrich · Witzhave, DE
• Ulf Hauschild · Hamburg, DE

Key dates

• Filing date: Aug 22, 2002
• Grant date: Dec 12, 2006
• Expiry date: Nov 21, 2023

Classification

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

Abstract

A method for minimizing the spread of the maximum compression forces in compacting powder, specifically metallic powder, by means of a powder press which has a die-plate, an upper ram, and at least one lower ram which are associated with a die-bore and are respectively operable by a hydraulic press cylinder, and a charging shoe movable on the die-plate along a predetermined path for filling the die-bore with the powder, wherein the maximum compression force of at least the upper ram is measured upon arrival at a predetermined position, the charging shoe, the die-plate, the upper ram and/or lower ram are vibrated at a predetermined frequency and amplitude during the filling operation and/or at the beginning of the compression procedure and, in addition, the filling time or the course of charging shoe motion in time are predetermined, wherein the frequency distribution of the maximum compression force values is determined at intervals and the standard deviation is determined therefrom for the maximum compression force, the standard deviation is compared to a predetermined value, if desired, and the vibration parameters, the course of motion in time and/or the path of charging shoe tr…