METHOD FOR PROFILING DIFFERENT-FLANGE CHANNEL BARS Russian patent published in 2000 - IPC

FIELD: rolled stock production, possibly manufacture of different-flange channel bars in multistand bending mills, preferably in light-type mills. SUBSTANCE: method comprises steps of successively bending flanges of channel bar by different angles in passes with predetermined rolling radius of lower rolls; at profiling channel bars with width ratio of large and small flanges no more than 3 determining value of summed angle of bending large flange in first pass (β₁), in next passes (β′) ( with total bending angle of small flange (α) no more than 45 degrees) and in passes (β″) (with bending angle of small flange in range 45-88 degrees) according to given expressions. Bending of small flange is completed in last but one pass. Large flange is bent in last but one pass and in last pass by the same angles. EFFECT: enhanced properties of different-flange channel bars with relatively small sizes, lowered wear of rolls. 2 cl, 1 ex