Method and apparatus for making holes in pipe
US6718860B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2001 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Nov 10, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9418
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for forming a plurality of slits in a tube includes first, forming a plurality of grooves in the pipe by operating a grooving punch along the length of each of the slits to be made. Then, each slit is formed in the pipe by operating a hole-making punch. The punch has ends at an acute angle and the punch is recessed from the ends toward the center thereof. In view of the fact that each groove is formed beforehand in the surface of the pipe and that the corresponding slit is made while moving the hole-making punch slowly from the ends, a large load is not exerted on the pipe and therefore the pipe is not crushed, burrs are not generated and the cutting chip is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.