Device for early detection of breaks and marginal wear in the cutting edges of tools

US4885530A · kind A · utility

Assignee

• Fried Krupp · DE

Inventors

• Kurt Mayer · Essen, DE
• Volker Richey · Dortmund, DE
• Hans-Peter Schneider · Stuttgart, DE

Key dates

• Filing date: Nov 20, 1987
• Grant date: Dec 5, 1989
• Expiry date: Nov 20, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T409/30392
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A device for the early detection of breaks and/or marginal wear in the cutting edge in machine tools equipped with reversible cutting plates having at least one insulated conductor path embedded in their cutting edge, with the conductor path being in communication with a voltage source and forming part of a circuit for actuating a signal to break off a machining process. The conductor path is part of an alternating circuit which is connected with the voltage source without physical contact. An induction coil disposed in the tool is able to induce a current in a circuit closed within the cutting plate itself and this current is measured by a measuring coil disposed in the tool. In some embodiments, insulated conductor paths in the reversible cutting plate are capacitively coupled with the voltage source without contacting it.