ANGULAR ASYMMETRICAL SHAPES NEW ROLLING METHOD Russian patent published in 2006 - IPC B21B1/09 

FIELD: rolled stock production, possibly rolling angular asymmetrical shapes, mainly for railway roads such as counter-rail angles having flanges of different thickness and width.

SUBSTANCE: method comprises steps of multiple reduction of blank. According to invention at first shape is formed in four symmetrical roll grooved passes. Two first passes are horizontal decahedral ones. After tilting rolled piece it is guided from second pass to vertical octahedral pass, tilted and rolled in rhombic pass, tilted again. Then it is rolled in preparation edging bell type pass whose opening is shifted along height and whose contour of lateral faces formed by upper and lower grooves is identical to contour of closed groove of next (along rolling process direction) shaped slit pass. Identical members of rolled piece and pass are coincided at biting. Shape is finally formed in next three shaped angular passes.

EFFECT: accurate geometry of shape, reduced consumption of rolling rolls.

2 dwg