The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 21, 1995
Filed:
Aug. 15, 1994
John Alverio, Macomb Township, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A method is disclosed for CVD wear coating of carbide rotary cutting tools without jeopardizing the sharpness and utility of the cutting edges. Initially, the tool is finish ground on all surfaces but for the cutting edges and the trailing relief surfaces adjacent thereto, which are left rough ground and 'high'. Then the entire tool is CVD coated with a suitable material at a very high temperature. This provides a tough coating, but embrittles or decarburizes the cutting edges. Next, the relief surfaces are finish ground, which brings all surfaces to final specification, sharpens the cutting edges, and removes the brittle layers. While the CVD coating is removed just behind the cutting edge, the relief surfaces behind the cutting edges are not as needful of a wear coating as the rake surfaces ahead of the cutting edges.