| 摘要 |
PROBLEM TO BE SOLVED: To improve the strength of a cylindrical roller and also reduce a machining man-hour. SOLUTION: A pair of filling slots 19, 19 are formed by forging on the metal raw material to make a cylindrical roller 5, at the initial stage of a manufacturing process. At the same time, the basic cylindrical surface concentric with the bottom surface 37 of each filling slot 19 and the basic plane vertical to the center axis of this basic cylindrical surface are formed on the inner diameter side part of this metal raw material. When the lathing is applied to the metal raw material, the center axis of this basic cylindrical surface forms a rotary center at the lathing time by supporting this basic cylindrical surface by the chuck of the lathe. By lathing the metal raw material under this state, the cylindrical surface 16 is formed on the outer periphery surface of this metal raw material and a spherical recessed surface 18 on the inner periphery surface alike so as to be concentric with the bottom 37 of each filling slot 19 respectively.
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