Control drive for a ram adjustment device on a blanking press

US4386304A · kind A · utility

Assignee

• L. Schuler GmbH · DE

Inventors

• Ewald Bergmann · Rechberghausen, DE
• Franz Schneider · Göppingen, DE
• Hartmut Hoffmann · Bad Wimpfen, DE
• Burkhard Schumann · Ottenbach, DE
• Gunther Grupp · Eislingen/Fils, DE

Key dates

• Filing date: Jul 10, 1978
• Grant date: May 31, 1983
• Expiry date: Jul 10, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B30B15/0041
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In control drives for high speed blanking presses, a serious problem of excessive tool wear arises from increases in the immersion depth of a top tool into its associated bottom tool when the stroke frequency increases. To overcome this, a control drive is provided wherein the top tool is held at a substantially constant immersion depth in the opening in the bottom tool over the entire stroke frequency range of the press. A measuring instrument detects the stroke frequency. This detected frequency is fed into a control circuit programmed with a characteristic corresponding to either immersion depth or ram adjustment as a function of stroke frequency. The output of the control circuit is a control signal coupled to a drive motor to maintain the constant immersion depth.