Method of making tool inserts and drill bits

US4481016A · kind A · utility

Inventors

• Nicoll A. D. Campbell · Kimberley, ZA
• Henry B. Dyer · Sandton, ZA
• Rainer Dietrich · Johannesburg, ZA
• Cornelius Phaal · Sandton, ZA
• Douglas Reid · Cambridge, GB

Key dates

• Filing date: Nov 30, 1981
• Grant date: Nov 6, 1984
• Expiry date: Nov 30, 2001

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23P15/30
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method of making inserts suitable for tool or drill bits which includes the step of fragmenting, e.g. by means of a laser beam, an abrasive compact in a plurality of discrete, non-segmental fragments. The inserts may have a variety of shapes, some of which are new, such as conical, truncated conical or truncated pyrimidal. The inserts are particularly useful for wire-drawing die blanks and core or oil-well drill bits.