Method and apparatus for cold rolling tubes

US5921128A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Horst Stinnertz · Willich, DE
• Jurgen Schmidt · Los Alamos, US

Key dates

• Filing date: Dec 2, 1997
• Grant date: Jul 13, 1999
• Expiry date: Dec 2, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21B2015/0028
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for continuously feeding rolling stock through a cold pilger rolling mill. A rolling stock--either a continuous or so-called "endless" piece, or a plurality of serially fed, spaced-apart pieces--is initially fed into a roll stand by a feed side drive or transporting arrangement, and thereafter, drawn through the rolling mill by a delivery side drive or transporting arrangement that is located in a rolling direction, i.e. downstream, from the feed side drive arrangement. Once the leading free end of the rolling stock is grasped by the delivery side transporting arrangement, the feed side transporting arrangement ceases to feed the rolling stock through the rolling mill, i.e. forward feeding of the rolling stock is exclusively controlled by the delivery side transporting arrangement. Thus, the critical compressive stresses and/or buckling stresses typically experienced by the rolling stock as a result of pushing the stock through the rolling mill are prevented and the disruptions in the rolling process caused by these stresses are accordingly also prevented. The transporting arrangements are operable independent of each other and at transporting or rolling spee…