Method and device for making holes at the circumference of a hollow shape

US5996455A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Ulrich Haag · Buxtehude, DE
• Uwe Hardtke · Neu Wulmstorf, DE
• Thomas Hulsberg · Schwäbisch Hall, DE

Key dates

• Filing date: Nov 20, 1997
• Grant date: Dec 7, 1999
• Expiry date: Nov 20, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/395
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method and a device for producing holes in the circumference of a hollow shape, with a wall piece being separated as a slug from the hollow shape in an internal high-pressure mold and being jammed without projecting relative to the outer circumference of the hollow shape in a previously produced hole. In order to remove the slug produced during punching in simple fashion from the internal high-pressure mold, the separated slug is jammed at a fluid pressure that is reduced relative to an internal high fluid pressure without loss via a punch and can separate the slug following removal of the finished hollow shape from the internal high-pressure mold, from the hollow shape, finally clearing the hole.