| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling method by which rolling is stably performed even when there is a difference between both circumferential lengths of a metallic ring and the difference between the circumferential lengths is easily corrected. SOLUTION: The circumferential lengths on both peripheral edges 9a, 9b of the metallic ring W are measured and compared. In tension rollers 2a, 2b having circular-arcuate outer peripheral surfaces 6a, 6b which are convex in a cross-sectional view in the middle part, the center line of the roller 2b is displaced from the center line of the roller 2a. The metallic ring W is stretched over the tension rollers 2a, 2b so that the peripheral edge on the short side of the circumferential lengths of the metallic ring W is situated in the vicinity of the center line of the displaced roller 2b and the center line of the metallic ring W is made to coincide with the center line of the roller 2a. By rolling the metallic ring W with a center roller 4 which is provided at mid-point of the tension rollers 2a, 2b and rolling roller 5, load for making plastic deformation possible is imparted to the metallic ring W. By rotationally driving the metallic ring W with the rolling roller 5, both peripheral edges are corrected into an equal peripheral length. The roller 2a is displaced by changing a shim.
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