METHOD FOR PRODUCING ALUMINUM ALLOY AND CASTING EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a method for producing aluminum alloy and casting equipment for uniformly fining a solidified structure by irradiation with ultrasonic wave.

SOLUTION: The method for producing aluminum alloy uses casting equipment including: a header 1 disposed on a casting mold; a throttle plate 7 dividing the inside of the header and the inside of the mold; and an ultrasonic horn 3 which is provided so as to be dipped into a molten metal inside the header and is disposed coaxially with a molten metal tapping hole 8 provided at the central part of the throttle plate, wherein the casting equipment has a shape in which the molten metal tapping hole provided at the throttle plate has a truncated cone part whose diameter increases upward. In the method, the throttle plate is used which has the molten metal tapping hole having a dimension in the range of Dh≤D≤1.5Dhand d/D=0.4 to 0.6 wherein: the diameter of the upper edge part of the truncated cone part is defined as D; the diameter of the lower edge part of the truncated cone part is defined as d; and the diameter of the tip of the ultrasonic horn is defined as Dh. The ultrasonic horn is installed at a position where the distance between its tip and the upper edge part of the throttle plate is 0.05 to 0.35 λ(λ denotes the wavelength in the alloy molten metal), and irradiation with ultrasonic wave is performed during the flowing of the molten metal through the inside of the header.

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