| 摘要 |
PURPOSE:To improve casting efficiency by covering V-grooves provided on the mating surface of one die with the flat mating surface of the other die and forming a specifically sized triangular shape. CONSTITUTION:The die 1 is constituted of the movable upper die 11 and the stationary lower die 12 and plural vent holes 2 are formed between the mating surfaces a1, a2 thereof. The V-grooves 3 are provided to the mating surface a2 of the lower die 12 and the grooves 3 are covered by the flat mating surface a1 of the upper die 11 to form the cross section having a regular triangle shape. The cross sectional area is so set that the three sides S1-S3 of the triangle contact with the outside periphery of the circle having <=0.6mm diameter. The molten metal advancing in the holes 2 is deprived of the heat retained therein by the three inside surfaces S1-S3, by which the molten metal is solidified in an early period in the stage of casting. Only the gas is thus discharged and flashes are separated from the V-grooves simultaneously with casting. The deflashing operation is made easy and the casting efficiency is improved. |
