Cold shears and method for cutting billets and bars

US4354411A · kind A · utility

Assignee

• SACK GmbH · DE

Inventors

• Karl Griese · Düsseldorf, DE
• Emil F. Kersting · Ratingen, DE
• Rolf Schulte

Key dates

• Filing date: Mar 24, 1980
• Grant date: Oct 19, 1982
• Expiry date: Mar 24, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T225/371
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The shears have a lower blade and an upper blade. The upper blade is reciprocated with respect to the lower blade through a transmission. The transmission includes a first eccentric which is continuously rotated to continuously reciprocate the upper blade over a vertical stroke equal to the throw of the first eccentric. This throw is transmitted to the upper blade through a second eccentric surrounding the first. The second eccentric is quickly rotatable, between two positions. In the first position, the upper blade is always clear of a billet on the lower blade. In the second position, the upper blade cuts the billet during the reciprocation. To ensure that the upper blade only penetrates approximately half the thickness of the billet, the position of the lower blade is vertically adjustable.