PREFINISHING STRATAL AND FINISHING EDGING-T-SHAPED PASSES FOR MANUFACTURING OF SEMI-FINISHED ROLLED PRODUCTS OF ELEVATOR GUIDE RAILS Russian patent published in 2008 - IPC B21B1/08 

FIELD: metallurgy.

SUBSTANCE: pass sequence contains breakdown, preleader, leader and finishing passes. Geometry fidelity of cross-section by crown, symmetry of bottom flanges, and quality of head chamfers is provided at the expense of pass which is implemented by stratal, sloped at the internal side from pin to profile bottom, allowing in top part of head compensator with regulated quantity of length and inclination. Finishing edging pass has chamfers at the side of profile head and made with keeping of conditions of high-altitude deformation by thickness of bottom η_b≤1.2, by profile height and output α≤1°.

EFFECT: accuracy enhancement of geometry of receiving by hot rolling semi-finished rolled products of elevator guide rails.

2 dwg