Method of making a sintered body having an internal channel
US4881431A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | May 23, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A drilling tool having at least one helical fluid flow channel at its interior, composed of a hard metal core having an exterior surface and a hard metal tubular casing having an interior surface, the casing enclosing the core with their surfaces in firm contact so that the core and casing form a composite body, each channel being formed as a groove in the surface of the core or casing. A method for manufacturing a sintered body having at least one internal channel, by providing a hard metal core having an exterior surface; providing a sinterable and heat shrinkable hard metal tubular casing having an interior surface which initially encloses a region larger in cross section than the core; forming in the surface of the core or casing at least one groove corresponding to the at least one channel; inserting the core into the casing after the step of forming a groove; and after the step of inserting, finish sintering at least the casing and shrinking the casing for bonding the core and casing together at the surfaces by diffusion. An extrusion molding tool for forming an extruded member having a helical surface groove from a blank forced through the tool, the tool including: a die; a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.