| 摘要 |
<p>A method of producing a ring member includes a cutting process in which a rectangular sheet is formed by cutting a strip-shaped material pulled out from a coiled material; a joining process in which opposite edges of the sheet are butted, and a cylindrical member is formed by joining the edges to each other; and a ring formation process in which a ring member is formed by cutting the cylindrical member in a direction perpendicular to an axis of the cylindrical member. In the cutting process, the strip-shaped material is i) cut along one of a first section line parallel to an edge of the strip-shaped material facing a direction in which the strip-shaped material is pulled, or a second section line perpendicular to the edge, and then ii) cut along the other of the first or second section line, that is perpendicular to the line previously cut.</p> |
