Pack carburizing process for earth boring drill bits
US4643051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Dec 6, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/66
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of manufacturing an earth boring bit of the type having a bearing pin which extends from a head section of the drill bit for rotatably mounting a cutter. A container is provided having opposing end openings with sidewalls therebetween which define a container interior. The container is placed over a portion of the head section so that the pin extends within the interior of the container. A spring spacer is then installed within the interior of the container about at least a portion of the circumference of the bearing pin at at least one axial location. The container is then packed with a particulate treating medium, the container is covered, and the pin and container are placed into a furnace for a time and at a temperature sufficient to activate the treating medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.