| 摘要 |
PURPOSE:To enhance the formation preciseness of the crest and stem parts of a steel shape by positioning each upper roll so that its outer-end side is slanted to the direction of a rolling downstream side with respect to the direction of a lower-roll axial line in rolling a steel shape by 3-rolls rolling. CONSTITUTION:In rolling a steel shape 3 by a lower roll 1 and a pair of skew upper rolls 2; the rolling is performed by slanting the axial line B of each upper roll 2 by an angle theta in the rolling direction with respect to the axial line A of lower roll 1, and positioning the roll 2 so that its outer-end 21 side is slanted to the rolling downstream-side with respect to the axial line A. Then a speed component F of the roll outer-peripheral surface acts in the direction to the inside of rolling material 3, to easily form a rising part of stem part S. In this way, the crest and stem parts of a steel shape are properly and precisely formed. |
