| 摘要 |
PURPOSE:To prolong roll life and improve manufacturing efficiency by constituting the ring by screwing the screw part provided on the outside surface of a roll shaft having a cooling water hole at the axial center part and the screw part provided to the inside surface of a sleeve enclosing the shaft. CONSTITUTION:A roll 17 is formed by cutting the threads of the screw part 15 over approximately the overall length of the outside peripheral surface of the barrel part of a roll shaft 12 having a cooling water hole 14, cutting the threads of a screw part 16 over approximately the overall length of the inside peripheral surface of a sleeve 13, screwing together the abovementioned both screw parts and enclosing the barrel part of the shaft 12 by way of the sleeve 13. As a result of this, even if the outside peripheral surface of the central part in the axial direction of the sleeve 13 touches the slab of a high temperature and rises in its temperature, no gaps are produced between the protrusions 15a, 16a of the screw parts, whereby the temperature rise of the central part of the sleevel 13 is suppressed, oxidation and cracking prevented, the life of the roll prolonged, the need for welding of the sleeve 13 and roll shaft 12 eliminated and working efficiency improved. |
