Integral finned tubes and a method of manufacturing same
US5036693A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49385
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Manufacture of integral finned tube utilizing a succession of plugged convergent, cold draw die stages. To produce a tube with diametrically opposed integral fins an initial stage die has an exit with an approximately elliptical outer periphery to form a tube with diametrically opposed thicker, or bulged walls. An intermediate stage has an exit of generally circular periphery with a pair of part circular, diametrically opposed, recesses to form a tube with more pronounced bulges. A final stage die has an exit of generally circular periphery with a pair of diametrically opposed, straight sided recesses to form a tube with bulges constituting planar faced fins. Between each successive stage the circumferential extent of each bulge is reduced while the maximum thickness is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.