Internal high pressure forming method for a workpiece

US6578400B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Pierre Bonny · Hamburg, DE
• Matthias Schroeder · Badendorf, DE
• Stefan Schwarz · Buxtehude, DE

Key dates

• Filing date: Jun 7, 2001
• Grant date: Jun 17, 2003
• Expiry date: Jun 7, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S72/71
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method and an apparatus are provided for internal high-pressure forming of a workpiece in a closed internal high-pressure forming die. The workpiece is expanded owing to the internal high fluid pressure exerted by a pressure generator and coming to rest on the cavity of the forming die. The workpiece and the forming die form friction partners in the areas of contact. In order to improve process reliability during the internal high-pressure forming of workpieces and to expand the scope of the method, vibration is imparted directly to at least one of the friction partners by a vibration generator during forming.