| 摘要 |
PROBLEM TO BE SOLVED: To prolong the life of a rolling roll by applying a specified web thickness draft to a flange width draft at the same time at the time of edge rolling. SOLUTION: When edge rolling is executed, a building part is generated at an edge part. A roll part brought into contact with the bulging part is worn locally. By making the bulging amount small, the local wear of the roll can be prevented. Simultaneously with edge rolling of the flange, the web is rolled, owing the drawing function, the tension of the longitudinal direction is applied on the flange part and the local bulging amount is made small. A back-up roll 63 is pressed freely rotating on the external circumference of a shaft part 62 of the web rolling roll 61. A flange reduction work roll 64 is supported by the back-up roll 63. The work roll 64 is displaced in the direction shown by an arrow mark A by opening or closing the back-up roll 63, and the rolling reduction is regulated. Simultaneously executing edge rolling with the work roll 64, the web part is rolled with the web rolling roll 61, and the bulging amount is made small. |
