| 摘要 |
PURPOSE:To efficiently form a multiple-sized wide flange beam with single rolling roll by rolling a rolled stock with a rough rolling caliber to form the rough wide flange beam stock of which the web has approximately the final thickness and subjecting such stock to stepwise cross expansion rolling with plural cross expanding hole calibers. CONSTITUTION:Both of the web Aa and flanges Ab, Ab of the rolled stock A are roughly rolled by the rough rolling caliber KA to form the rough wide flange beam stock A1. The stock A1 is then subjected to the cross expansion rolling by the cross expanding caliber K which makes press contact with the inside of the flanges Ab, Ab without strongly pressing the web Aa. the stock A1 is gradually cross expanded by passing through the plural cross expanding calibers, by which the wide flange beam having a desired width is obtd. The wide flange beam having many sizes in the transverse direction is thus formed by the single rolling rolls 1, 1. |
