PURPOSE: To prevent bubbles and materials stuck to wall surface from being swallowed into molten metal entering a cavity of product.
CONSTITUTION: In a vacuum casting method in which the cavity 6 for product is made vacuum and the molten metal 24 risen in a molten metal dome 8 is filled up into the cavity 6 for product at high velocity by opening a gate 10, in the process for rising the molten metal 24 in the molten metal dome 8 from a molten metal holding furnace 22 through a stoke 20, the molten metal 24 is risen while being vertically moved in the molten metal dome 8 once or more or while being revolved in the stoke 20. By this method, the materials and bubbles stuck to the wall surface are removed from the wall surface by utilizing the movement of the molten metal and floated up to the upper surface of the molten metal in the molten metal dome 8 so that they don't enter the cavity 6 for product.
| JPH0716726 | VACUUM CASTING APPARATUS |
HASEGAWA TAMOTSU
ARAKAWA YASUYUKI
