| 摘要 |
PURPOSE:To hold sure separation and to obtain plural equal final shape rolled stocks by forming a thin part and preparatory formed parts connecting with the thin part and dividing the preparatory parts into two parts by passing the preparatory parts between stepped rollers facing to each other. CONSTITUTION:One square stock 1, etc. is flattened by preparatory rolling, a thin part 2 along the rolling direction is formed, and then a couple of flat parts F connected with the thin part S are formed by the succeeding rolling. Next, the stock is passed through a split roller stand having a couple of separator rollers SR consisting of a large diameter part D1 and a small diameter part D2. A separating force, caused by a peripheral speed difference between that of the part D1 and that of the part D2 of the roller SR, which separates the plural preparatorily formed parts up and down is applied to the parts so that the parts are separated at the thin part S. Separated square stocks 1 are rolled to be an oval shape and then are rolled to be a round shape. |
