| 摘要 |
PURPOSE:To form the compound roll that the rolling result is remarkably increased by making the thickness of the 1st outer layer of a compound roll inclining in the axial direction according to the depth of a caliber hole die and by making the 2nd outer layer in about uniform thickness. CONSTITUTION:The shell part of a compound roll is formed by the 1st outer layer 1 having excellent wear resistance and rough surface resistance, the 2nd outer layer 2 having excellent crack resistance and stiffness and the core part 3 excellent in stiffness. The groove die K1, K3, K5, K7 of a caliber are formed on the shell part in the order from the deeper one to the sharrower one in the axial direction from the shell end. In this composition the thickness of the 1st outer layer 1 is formed thinner than the depth of this groove die K1 at the initial diameter time on a deep groove die K1 part, formed in the thickness until the abolishing diameter on a sharrow groove die K7 and as a whole the thickness is made to differ in slant shape in the axial direction. In this case the outer layer thickness difference in both end faces is preferably taken as about 10-150mm. The thickness of the 2nd outer layer 2 is made uniform over the axial direction and slightly smaller than the caliber abolishing diameter. |
