| 摘要 |
PURPOSE:To prevent generation of a fish-tail in a slab receiving a rolling process by rolling the edge of a slab in the direction of its breadth so as to reduce the breadth, and at the same time, by rolling the slab so as to give a gradually reduced rolling reduction to the breadth of the part continuing to said edge toward the longitudinal middle zone. CONSTITUTION:An edge of a slab 1 is rolled in the direction of breadth by a press die 6 parallel to the end plane of the slab 1. At the same time, the part continuing to said parallelly rolled edge toward the longitudinal middle zone, is rolled by a tapered press die which gives a breadth reduction gradually diminished toward the middle zone. By the present method, a tail end restrainer becomes needless, a preliminary formation can be performed without generating laps, and the generation of a fish-tail by a rolling process is prevented. The shape of the die 6 to be employed by the present edging process is selected so as to place the neutral point of deformation of the slab 1 by a press work behind the border between the parallel zone 6a and the tapered zone 6b. |
