METHOD FOR ROLLING ROUND SHAPES OF LARGE DIAMETERS IN SEGMENT TYPE ROLL GROOVED PASSES Russian patent published in 2008 - IPC B21B1/00 

FIELD: processes for rolling ingots in bloomers.

SUBSTANCE: billet or ingot is rolled in bloomer at first on flat barrel and then in box type roll grooved passes. Method comprises steps of feeding rectangular rolled piece to special segment-type oval roll grooved pass for producing target shape during two passes, pre-final and final, in the same roll grooved pass at tilting it by 90° between said passes for producing target round shape.

EFFECT: enlarged manufacturing possibilities of large-bar rolling reversing mills such as bloomers, enlarged assortment due to rolling round large-diameter shapes that may be produced formerly only by forging, possibility for rolling large-diameter round shapes in bloomer without restricting existing assortment of mill.

3 dwg