| 摘要 |
PURPOSE:To shorten setting time of a core and to improve casting accuracy by consecutively arranging core shaping parts forming a part of outer-shape of a crank shaft to a core body for forming hollow pin and journal. CONSTITUTION:One pair of cores 1, 1 are arranged mutually as facing so as to become reversed direction. Further, in order to make the hollow-shapes of the journal 11c and pins 12a, 12b, 12d, the cores 1, 1 are constituted by the core bodies 1a, 1b, journal 11b, pin 12c and the shaped part 1c forming outer shape. In the crank shaft for V type six cylinders, as the core bodies 1a, 1b are consecutively formed through the core shaped part 1c, complication of the core shape is restrained. In a part of the shaped part 1c, the forming of shaped part at main mold 2 side is not necessary. By this method, interference between the core 1 and the main mold 2 is eliminated. Therefore, the setting time of the core is shortened and the casting accuracy is improved.
|
