| 摘要 |
PROBLEM TO BE SOLVED: To obtain the production method of a thickness-reduced material capable of simplifying a production process and having a high material yield by performing ironing to a peripheral wall, while an ironing die and a stock are relatively moved, to at least a part of the stock in the axial direction, and forming a thickness-reduced part to the worked part. SOLUTION: An ironing die 20 to form a thickness-reduced part 11 is the split dies bisecting a peripheral wall in the peripheral direction. Ironing is performed by that the ironing part 21 of the ironing die 20 is butted on the part to be worked of the outer peripheral wall of a stock 1, the stock 1 is moved up to a working completion position (arrow mark PA) while fixing the position of the die 20, or the ironing die 20 is moved to a working completion position (arrow mark PB) by the stock 1. The ironing die 20 and the stock 1 are required to relatively move, force (PC) is imparted in the relative advancing direction of the stock 1, thus, the ironing force is reduced, the dimensional precision and shape stability of a worked part are improved.
|
