| 摘要 |
The present invention relates to the extru-rolling and pressure- welding method and device for making of metal plate multi-cell hollow tube. When two or more hot metal sheets are extru-rolled and pressure-welded in the forming cavity between two female and male shaped rollers and multi-legs mandrel by compressing and rotating force of shaped rollers, longitudinal multi-holes and walls in the section of plate multi-cell hollow tube can be made by multi-legs mandrel, and perforated holes can be made by stopping instantly pressure<->welding by wall removal mandrels connected with rotating crankshaft or cam. |
