Method for producing threaded sections of threading tools
US4548000A · kind A · utility
Inventor
Key dates
| Filing date | Dec 20, 1983 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Dec 20, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23G1/36
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The threaded portion of a tap drill is formed by mounting a tool blank for rotation about a longitudinal axis and mounting first and second grinding wheels integrally for rotation about a common second longitudinal axis parallel to the longitudinal axis of the tool blank. The tool blank and a first grinding wheel are rotated about the respective longitudinal axes thereof while moved longitudinally with respect thereto, thereby employing grinding ribs of the first grinding wheel to form threads in the blank. The second grinding wheel then is moved closer to the blank and a smooth peripheral surface of the second grinding wheel grinds away outer portions of the threads at an end portion of the tool blank, thus forming a tapered starting end of the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.