| 摘要 |
PURPOSE:To prevent the crack generation in rolling by using the spiral shaping for the rim center axis of the weld zone together with a peening hardening in obtaining a product with rolling by making an annular blank body by welding a plate blank. CONSTITUTION:A plate shaped rim blank is prepared by cutting it so as to incline for the longitudinal direction of the coil from the coil stock manufactured from the rolling of a slab and so that the butt end thereof becomes spiral for the center shaft of the rim in winding. The both ends of this blank is subjected to butt welding after its winding annularly. The peening is then performed on the weld zone until the weld zone shows the work hardening in the refining state of H14 - H16 as regulated in JIS standards. A cold work is then performed on the rim into the necessary final shape with the rolling works of a spinning, ring rolling, etc., after forming the vicinity of the weld zone in a smooth surface by performing the trimming of residual part of excess metal.
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