| 摘要 |
PURPOSE:To easily form a peep that is to be an introducing part at the time of press- fitting into the end part of a punching mark and to rationalize manufacturing work process by punching a coupling axis through shaping the end part of a metallic mold blade to reduce the punching width towards the axial direction. CONSTITUTION:Following an effective punching mark part 2, an introducing punching mark part 3 of which the punching width is reduced towards the shaft end part is integrally formed by a metallic mold. Consequently, a pressurizing area is gradually reduced towards the end part of the punching mark 4, and the punching mark 4 is formed in which the raised hight is gradually lowered from the effective hight of the punching mark 4 to the outer diameter of the punching shaft. Namely, the original effective punching mark 2 and the introducing punching mark 3 that is to be the introducing part are formed simultaneously with one metallic mold blade. Thus, at the time of press-fitting the shaft into a press-fit body such as a rotor core, the introducing punching mark part 3 is made a peep and the centering is easily and surely performed and the press-fit coupling is uniformly performed. Also, as either punching mark parts 2, 3 are formed by press mold, the forming is easy and the workability is good. |
