Method of and roll stand for diagonal rolling of tubes

US5644938A · kind A · utility

Inventors

• Hermann Moeltner · Grevenbroich, DE
• Karlhans Staat · Ratingen, DE

Key dates

• Filing date: Aug 11, 1995
• Grant date: Jul 8, 1997
• Expiry date: Aug 11, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21B19/06
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In a method and a roll stand for diagonal rolling of medium or thin-walled tube ingots, an inner mandrel rod is held at an inlet side and controllably axially displaceably relative to rolls. In order to avoid a funnel-shaped expansion at the tube ingot end, the rolling product during rolling is rolled in a constriction of the mandrel rod and thereby obtains a thickened wall forming a support of the tube ingot wall against the expansion.