| 摘要 |
PROBLEM TO BE SOLVED: To provide a ring rolling mill which prevents occurrence of angular speed differences in various parts of work during metal rolling and can roll work having varying outer diameters, instead of straight outer diameters, with good precision.SOLUTION: A ring rolling mill comprises a mandrel 121, a first main roll 111 rolling a part of the periphery of a blank W, a second main roll 112 rolling a part different from the part of the periphery of the blank W rolled by the first main roll 111 and having an outer diameter different from that of the main roll 111, first drive means 130 of rotation-driving the first main roll 111, second drive means 140 of rotation-driving the second main roll 112, outer diameter measurement means 150 of measuring outer diameter dimensions of the part of the blank W rolled by the second main roll 112 and control means 160 of controlling the drive of the first drive means 130 on the basis of the information on measurements obtained by the outer diameter measurement means 150 so as to adjust the number of revolutions of the first main roll 111. |
