Screw head formation
US6755748B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Jun 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45137
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The screw has two or three non-circular super-imposed recesses. The depth of each recess is less than 1.2 mm and there is a less than 1° of draw in each recess. The screw head recess is formed using a punch (10) in a cold-heading process. The punch is formed in a profilating CNC machine, cutting the profiles (12,14,16) of the punch to a tolerance of better than ±0.025 mm. A method of manufacture of a cold-forming punch for such a screw comprises providing a profilating head as one of the tools on a turret mounted adjacent the chuck in the CNC machine. The profilating head has several cutting elements, each being adjustable with respect to one another: axially, radially and angularly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.