Throwaway inserts and throwaway drill
US5954459A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1998 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/906
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A throwaway drill capable of machining a workpiece stably in a balanced manner even under high-efficiency, high-load conditions and capable of disposing of chips efficiently and smoothly. The drill carries an outer insert and an inner insert. As shown, each insert has a plurality of cutting edges each having a curved crest, a first slope, and a second slope which is at least partially a curved line. The inner and outer inserts are arranged so that the cutting area to be cut by the outer insert alone is partially cut by a cutting edge portion of the inner insert near its corner, and the cutting area which to be cut by the inner insert alone is partially cut by the crest of one cutting edge of the outer insert.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.