METHOD FOR MANUFACTURING PREFORM AND AXIALLY-SYMMETRIC COMPONENT

摘要

This method for manufacturing a preform includes an ironing step and a wall-thickening step. In the ironing step, a deformation-targeted region of a sheet material is subjected to localized heating by induction heating while rotating the sheet material, as well as pressing a machining tool against the deformation-targeted region, and forming a tapered shape of prescribed dimensions in the sheet material. In the wall-thickening step, a peripheral edge portion at the foot of the tapered shape of the sheet material is subjected to localized heating while rotating the sheet material, and a forming roller is pressed against the peripheral edge portion in such a way as to push in the peripheral edge portion in a direction orthogonal to the thickness direction of the peripheral edge portion, causing the peripheral edge portion to distend inward.