MANUFACTURING METHOD FOR CYLINDRICAL MEMBER AND CYLINDRICAL MEMBER

To provide a manufacturing method for a cylindrical member that can efficiently manufacture a cylindrical member that has a step on an inner peripheral surface thereof and has an outer screw on an outer peripheral surface thereof.SOLUTION: The manufacturing method for a cylindrical member includes: a step of preparing a first cylindrical body extending in a predetermined axis direction and having a certain inner diameter and a certain outer diameter in the axis direction; a step of preparing a receiving mold that can be inserted into the first cylindrical body, with a gap formed between an inner peripheral surface of the first cylindrical body and the mold; a step of preparing a second cylindrical body that extends in the axial direction and can be inserted into the gap between the receiving mold and the first cylindrical body; and a step of rolling an outer screw part on an outer peripheral surface of the first cylindrical body and coupling the second cylindrical body to the first cylindrical body, by pressing a rolling tool against a region where the first cylindrical body overlaps with the second cylindrical body, from outside of the first cylindrical body, in a state where the receiving mold is inserted into the first cylindrical body and the second cylindrical body is inserted into the gap between the first cylindrical body and the receiving mold.SELECTED DRAWING: Figure 7 【課題】内周面に段差を有し、外周面に外ねじを有する筒状部材を効率よく製造可能な筒状部材の製造方法を提供する。【解決手段】筒状部材の製造方法は、所定の軸方向に延びるとともに、軸方向において一定の内径および外径を有する第１の筒体を準備する工程と、第１の筒体の内周面との間に間隙を形成した状態で第１の筒体内に挿入可能な受け型を準備する工程と、軸方向に延び、受け型と前記第１の筒体との間の間隙に挿入可能な第２の筒体を準備する工程と、第１の筒体内に受け型が挿入され、かつ、第１の筒体と受け型との間の間隙に第２の筒体が挿入された状態で、第１の筒体と第２の筒体とが重なる領域に対して第１の筒体の外側から転造工具を押し当てることにより第１の筒体の外周面に外ねじ部を転造するとともに第１の筒体に対して第２の筒体を結合させる工程と、を含む。【選択図】図７