Twist drill tips, precursor constructions for use in making same, and methods for making and using same
US9975185B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 12, 2012 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Jun 28, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24802
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A tip for twist drill, comprising a super-hard structure joined to a substrate at an interface boundary coterminous with an end of the substrate, the super-hard structure comprising sintered polycrystalline material comprising super-hard grains, the super-hard structure defining a super-hard end surface opposite the interface boundary and a plurality of cutting edges configured for boring into a body in use; the super-hard end surface including a center point or chisel edge, and comprising a plurality of surface regions configured such that respective planes tangential to each of the surface regions are disposed at substantially different angles from the axis of rotation of the tip in use. Precursor constructions for use in manufacturing the tips as well as methods for making the precursor constructions and the tips are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.