| 摘要 |
PURPOSE:To make smooth and secure joining in a short period by separately blanking the rear end of a preceding rolling material and the front end of a succeeding rolling material to a jigsaw shape, fitting the ends to each other and welding the side faces of the ends thereof. CONSTITUTION:The preceding rolling material 6a is advanced into a guide passage 90a for said material and the succeeding rolling material is advanced into a guide passage 90b for said material in a roughing line. Both materials 6a, 6b are stopped and the injection of an inert gas from fine holes provided to upper knives 51a, 51b or lower knives 52a, 52b is started. The rear end of the preceding rolling material 6a is cut to the jigsaw shape by a lower blade unit 50a and the front end of the succeeding rolling material 6b is cut to the jigsaw shape by an upper blade unit 50b. The unit 50a and the passage 90a are raised and the unit 50b and the passage 90b are lowered so that the cut ends of the rolling materials 6a, 6b are fitted to each other. The injection of the inert gas is stopped and the side edges of the fitted parts are joined to each by welding. |
