| 摘要 |
PURPOSE:To work easily even a stock of small tensile strength without causing its breakage even in a case of using a number of roll-die groups by using, as one unit, two sets of forced driving rolls arranged so that the axes of both sets are perpendicular to each other and making the distance between the roll axes of both sets smaller than the diam. of roll. CONSTITUTION:A metallic stock 1 is rolled by rolls 2 into an elliptic shape 1a and successively into a circular shape 1b by rolls 3, and is thereafter rolled into an elliptic shape 1c by rolls 4 to roll it into a circular shape 1d by rolls 5. In the same manner, the rolling is repeated required number of times. the stock between the rolls 3, 4 is unstable because of its elliptic shape, but is well rolled even if its tensile strength is small because the distance between both rolls 2, 3 is smaller than the roll diam. The stock between the rolls 3, 4 is stable because of its circular shape, and the distance between rolls 3, 4 can be made larger than the roll diam. Accordingly, the stock can be worked again after annealing by interposing a stock-heating device 6 between both units. In this way, even a work-hardening stock is easily and continuously worked. Because the rolls 2, 3, 4, 5 are forcibly rotated, the need for drawing the stock from the product side is eliminated, and the breakage of stock due to the drawing is prevented. |
