Method for the calibrated cross-section reduction of a workpiece rotating during such method.

US5001916A · kind A · utility

Assignee

• ERNST GROB AG · CH

Inventors

• Werner Schuler · Winden im Elztal, DE
• Daniel Deriaz · Meilen, CH

Key dates

• Filing date: Sep 11, 1989
• Grant date: Mar 26, 1991
• Expiry date: Sep 11, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21H5/02
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Rolling tools are rotatably mounted in rotatably driven rolling heads such that they revolve in a planetary-like fashion while the rolling heads rotate. The rolling tools thus roll with blows or impacts upon the outer surface of the rotating workpiece which is advanced along its lengthwise axis. A diameter reduction of the workpiece occurs and the workpiece material is predominantly displaced in lengthwise direction. The workpiece is moved along its axis in the feed direction at an axial feed velocity of at least 3 millimeters for each workpiece revolution, and in the case of hollow workpieces preferably at least at 5 millimeters per workpiece revolution. Difficulties which otherwise arise for certain materials can thus be avoided, and also the production speed and quality can be increased. For hollow workpieces, undergoing internal profiling upon a mandrel, the workpiece which is advanced at high axial feed is preferably also cold rolled during its return feed or motion. The return feed should be at most equal to the magnitude of the forward feed but may be also around such order of magnitude.