Surface decarburization of a drill bit having a refined primary cutting edge
US5628837A · kind A · utility
36Cited by
30References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1994 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Sep 28, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2251/18
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A cutting tool is decarburized by placing the tool in a protective environment, heating in this environment to a temperature of 600.degree.-1100.degree. C., and maintaining this temperature for a period of 15-120 minutes. The cutting tool may be a cemented carbide microdrill which contains primary cutting edges which form an angular surface on the forward end of a rake surface at the cutting tip, and a radius surface which extends from the angular surface to a flank surface which extends from an outer diameter of the cutting tip to an axis of symmetry of the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.