Continuous metal tube casting method and apparatus
US4865116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1988 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Jun 28, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D11/145
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Dense, homogeneous tubular metal products such as pipe is cast in long lengths continuously by introducing liquid metal into the lower portion of an annular-shaped casting vessel. The liquid metal is withdrawn in the presence of an outer elongated upwardly travelling alternating electromagnetic levitation field and a second inner electromagnetic levitation field for maintaining the tubular liquid metal column in a substantially weightless and pressureless contact condition while solidifying. The resulting solidified tubular metal product is withdrawn from the upper portion of the field, cooled and further processed to result in a desired and product/and has a homogeneous, fully dense, fine grain structure due to continuous eddy current stirring by the levitating electromagnetic fields and a ripply, shiny exterior surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.