| 摘要 |
PURPOSE:To enable beads to be formed simultaneously with upsetting process so as to remarkably improve the working efficiency by forming bead part shaping flutes and ridges on the metal mold which serves for upsetting process to both ends of an axle housing or so. CONSTITUTION:When a thick part 9 and a plurality of bead parts 10 are formed on both end parts of an axle housing 1 in order to mount a hub wheel mounting flange (not illustrated) on both end parts thereof, unupsetting and coining metal mold 2 is prepared. Said metal mold 2 is built up with a bottomed cylindrical cap 2A and a columnar core metal 2B having the diameter smaller than the inner diameter of the cylindrical part 4 of the cap. Four flutes 5 are formed on the inner wall face of the cylindrical part 4 thereof while four ridges 7 are formed on the external face of the core metal 2B at the position coinciding with said flutes 5, and both metals 2A and 2B are integrated with each other by screwing a thread 6 in a threaded hole. The metal mold 2 which is shaped as above is pressed on both end parts of the housing 1 to form the thick part 9 and bead parts 10. |
