Process for the production of tubular structural parts fabricated from PGM materials and having circumferential undulating bulges

US7007532B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Rudolf Singer · Engelstadt, DE
• Hubertus Golitzer · Alzenau, DE

Key dates

• Filing date: Oct 18, 2001
• Grant date: Mar 7, 2006
• Expiry date: Jan 20, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21D15/10
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A process for the production of tubular structural parts fabricated from PGM materials and having circumferential undulating bulges by forming from smooth-walled tube pieces. A smooth-walled tube piece (1) is inserted into a cylindrical forming die (2) with an internal diameter that corresponds substantially to the external diameter of the tube piece and that has radial undulating recesses (3). This die is provided at both axial ends with a press tool (4,5) that tightly seals the tube ends. The space that is thus formed is completely filled with an hydraulic fluid (6), and an hydraulic internal pressure is then produced by exerting an axial compression via the press tools (4,5) in such a way that under simultaneous shortening of the tube piece bulges (7) are formed in the wall of the latter that correspond to the recesses (3) of the forming die (2).