| 摘要 |
PURPOSE:To facilitate the fabrication of a mold, by providing a pull-off preventing bead to a rod shaped return pin fabricated so as to be matched with the dimension between the parting surface of a fixed mold and an ejector plate. CONSTITUTION:In the mold clamping state of a fixed mold 3 and a movable mold 7, the dimension A between a parting surface 4 and the upper surface of an upper ejector plate 5 is measured. In the next step, a return pin 1' is fabricated so as to be matched with this dimension A. This return pin 1' is inserted through the piercing hole 8 of a movable mold 7 and a pull-off preventing bead is welded to the groove 6 of the return pin 1' in a mold matched state to prevent the pull-off of the return pin 1'. By this mechanism, the length of the return pin can be adjusted within a short time and the parting surface of the fixed mold 3 and the leading end surface of the return pin can be closely contacted with certainty and mold fabrication becomes easy because the configuration of the return pin becomes simple. |
