| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a roller having more accurate straightness and a smaller outer diameter difference. SOLUTION: Rotating extrusion molding is applied to a roller material, when molded, and center-less grinding is applied to the outer periphery face of the roller material manufactured by the rotating extrusion molding. Thus, the roller has an outer diameter difference of 0.01 mm or smaller.
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