Method of manufacturing and manufacturing apparatus for a ring member attached product

A method of manufacturing an assembled product that has a ring-shaped seal body attached to a ring-shaped attachment channel formed in an outer circumferential surface of a component main body, the method comprising:

• a supplying step that supplies the seal body to a guide member that has been detachably mounted on the component main body;
• a moving step that moves the seal body from a supplying position on the guide member to a facing position that faces the attachment channel;
• and
• an attachment step that guides the seal member that has moved to the facing position into the attachment channel,
• wherein the ring-shaped seal body is capable of elastic deformation and is provided with a ring-shaped inner circumferential portion, a first facing surface that faces a first inner wall out of a pair of inner walls of the attachment channel when the seal body is attached to the attachment channel, and a second facing surface that faces a second inner wall out of the pair of inner walls,
• the guide member includes a large diameter portion, which is positioned on an attachment channel side when the guide member is mounted on the component main body, and a tapered portion, which is continuous with the large diameter portion and narrows, and the guide member is positioned so that an axis of the tapered portion matches an axis of the component main body,
• the supplying step fits the ring-shaped inner circumferential portion of the ring-shaped seal body onto the tapered portion of the guide member,
• the moving step moves the seal body toward the attachment channel with the inner circumferential portion of the seal body in contact with the tapered portion to expand an inner diameter of the ring-shaped inner circumferential portion to an outer diameter of the outer circumferential surface or larger, and
• when the ring-shaped seal body at the facing position is attached to the attachment channel, the attachment step guides attachment to the attachment channel while guiding the ring-shaped seal body that deforms from an expanded state to a reduced diameter due to elastic deformation,
• wherein the moving step holds at least part of a circumferential end surface and a circumferential edge portion of the seal body supplied to the tapered portion using a holding unit, and expands the inner diameter of the seal body held by the holding unit by moving the seal body along the tapered portion toward the attachment channel in a state where holding of the seal body is maintained, and the attachment step moves the seal body from a position contacting the large diameter portion to the facing position in a state where the holding of the seal body by the holding unit is maintained and, when a pressing force that acts outwardly in a radial direction of the seal body due to the large diameter portion is released so that the inner diameter of the seal body reduces due to elastic deformation, guides the seal body into the attachment channel in a state where the holding of the seal body by the holding unit is maintained,
• wherein the holding unit is equipped with a plurality of holding plates equipped with holding portions that hold the circumferential end surface and the circumferential edge portion of the seal body by a first surface that faces the first facing surface of the held seal body, a second surface that faces the second facing surface of the seal body, and an outer facing surface that faces an outer circumferential surface of the seal body.