Method of making drills, endmills and other rotating-and-cutting tools
US4887496A · kind A · utility
5Cited by
0References
9Claims
0Family size
Inventor
Key dates
| Filing date | Sep 21, 1988 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Sep 21, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S76/11
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a method of making drills, endmills and other rotating-and-cutting tools comprising the steps of: extruding super-hard metal powder into a spiral rod; sintering the spiral rod; forming a-ferrous metal powder layer around the rear end of the spiral rod sinter; and heating and then cooling the ferrous metal powder layer in such a way that voids may be caused to appear in the ferrous metal powder layer, which is integrally connected to the spiral rod sinter to make up its shank. Thanks to the existence of the voids in the shank layer, any inner strain will be dissipated, assuring that crack-free products result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.