Method for manufacturing annular metal workpieces

US4084419A · kind A · utility

Assignee

• Thyssen Industrie AG · DE

Inventors

• Erich Dittrich
• Siegfried Grone · Witten, DE

Key dates

• Filing date: Mar 7, 1977
• Grant date: Apr 18, 1978
• Expiry date: Mar 7, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21J9/025
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method of manufacturing annular metal workpieces which have a deeply profiled cross-section, such as a blank flange, comprises heating the workpiece bloom or bar to a forging temperature and upsetting and piercing the workpiece to form a pierced blank. The pierced blank is then roughened by applying a force which acts at least on the outside and the inside periphery while the blank is rotated in order to form the blank into a ring which has a substantially rectangular cross-section and an inside diameter which is equal to or slightly larger than the inside diameter of the finished part. Thereupon, the ring is rotated and is shaped to the desired profile by directing a force on the front face of the rotating ring and finish-rolling it to the final internal and external diameters. The forces are exerted simultaneously on the peripheral surfaces and the front surfaces of the rotating ring. The material flow of the rotating ring is limited in the radial direction during this process. The rolling mill for carrying out the method includes first and second mill rolls which are mounted on respective axes for rotation with the axis of one of the rolls being inclined relative to the other …