Internally groove forming apparatus for heat exchanging pipes
US4142392A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1977 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Sep 12, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C37/207
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An internal groove forming apparatus for heat exchanging pipes, having a cylindrical holder adapted to be loosely fitted in a heat exchanging pipe in concentric relationship, and a plurality of groove forming rolling tools arranged on the holder in a plurality of axially spaced, circumferentially oriented rows and rotatably supported on the holder in such a manner that the rolling tools of one of the two adjacent rows are disposed in staggered relationship with respect to those of the other and an imaginary circle circumscribing the rolling tools is interposed between an outer peripheral surface and an inner peripheral surface of the heat exchanging pipe. Axial relative movements of the heat exchanging pipe and the holder enable the rolling tools to form a number of substantially axially oriented grooves on the inner peripheral surface of the heat exchanging pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.