METHOD OF INCREASING THE LIFE OF CARBIDE CUTTING TOOLS

• US 3,615,884 A
• Filed: 01/26/1970
• Issued: 10/26/1971
• Est. Priority Date: 01/26/1970
• Status: Expired due to Term

• Current Assignee: James D. Collins
• Original Assignee: James D. Collins
• Inventors: Collins, James D.
• Primary Examiner(s): Kendall, Ralph S.
• Application Number:
  US05/005,602
• Time in Patent Office: 638 Days
• Field of Search: 148/6,6.3,6.35,126 29/182.7,182.3,182.8,95 51/309 75/203,204 76/101
• US Class Current: 148/286
• CPC Class Codes: C22C 29/00 Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides C22C26/00 takes precedence
• CPC Class Codes: C23C 30/005 on hard metal substrates

Abstract

A method of increasing the life and cutting characteristics of a carbide cutting tool is disclosed wherein the tool is heated in the range of 750* to 1600* F. in an oxidizing environment for a time sufficient to produce an oxide layer on the tool having a thickness of at least 0.0002 inch. The oxide layer prevents instantaneous edge buildup resulting in improved tool life at speed and feed ranges at which built-up edge is the failure mode.

Claims

2. A method of improving the useful life and cutting characteristics of a carbide cutting tool having a cobalt binder comprising, heating said tool, before use, in an oxidizing environment to a temperature in the range of 750* to 1,600* F. for a time sufficient for a layer of cobalt oxide having a thickness of about 0.0002 inch to form on said tool.

3. A method of improving the useful life and cutting characteristics of a carbide cutting tool having a cobalt binder comprising, heating said tool, before use, in an oxidizing environment to a temperature in the range of 1,100* to 1,200* F. for a time sufficient for a layer of cobalt oxide having a thickness of at least about 0.0002 inch to form on said tool.