Horizontal continuous casting apparatus and method for manufacturing aluminum alloy cast rod using the same

1. A horizontal continuous casting apparatus, in which molten aluminum alloy in a molten metal receiving portion of a hollow mold is supplied from one end side of the mold to a hollow portion of the mold, of which the central axis of the hollow portion is arranged along a horizontal direction, to manufacture an aluminum alloy cast rod, comprising:

a fluid supply pipe for supplying a lubricating fluid to the hollow portion of the mold, which is arranged on one end side of the mold; and,

a cooling water cavity for accommodating cooling water cooling an inner peripheral surface of the hollow portion of the mold, which is formed outside the inner peripheral surface:

wherein the inner peripheral surface and an inner bottom surface of the cooling water cavity facing the inner peripheral surface form parallel surfaces with each other, and a cooling wall of the mold between the inner peripheral surface and the inner bottom surface is solid and formed so that a heat flux value per unit area from the molten aluminum alloy to the cooling water is 10×10 5 W/m 2 or more, wherein the heat flux value per unit area of 10×10 5 W/m 2 or more is due to the cooling wall of the mold between the inner peripheral surface and the inner bottom surface being solid.

2. The horizontal continuous casting apparatus according to claim 1 , wherein the heat flux value per unit area is 10×10 5 W/m 2 to 50×10 5 W/m 2 .

3. The horizontal continuous casting apparatus according to claim 1 , wherein the thickness of the cooling wall of the mold is in the range of 0.5 mm or more and 3.0 mm or less.

4. The horizontal continuous casting apparatus according to claim 1 , further comprising a cooling water injection passage for communicating the cooling water cavity with the hollow portion of the mold.

5. The horizontal continuous casting apparatus according to claim 1 , further comprising a heat insulating member arranged between the molten metal receiving portion and the one end side of the mold.

6. The horizontal continuous casting apparatus according to claim 1 , wherein the molten aluminum alloy has a magnesium content of 0.5 mass % or more.

7. The horizontal continuous casting apparatus according to claim 1 , wherein the molten aluminum alloy contains Si (content: 0.05 to 1.3 mass %), Fe (content: 0.1 to 0.7 mass %), Cu (content: 0.1 to 2.5% mass %), Mn (content: 0.05 to 1.1 mass %), Mg (content: 0.8 to 3.5 mass %), Cr (content: 0.04 to 0.4 mass %), and Zn (content: 0.05 to 8.0 mass % or less).

8. The horizontal continuous casting apparatus according to claim 1 , wherein the thickness of the cooling wall of the mold is in the range of 0.5 mm or more and 2.5 mm or less.

9. The horizontal continuous casting apparatus according to claim 1 , wherein the thickness of the cooling wall of the mold is in the range of 0.5 mm or more and 2 mm or less.

10. The horizontal continuous casting apparatus according to claim 1 , wherein the thickness of the cooling wall of the mold is in the range of 0.5 mm or more and 1.3 mm or less.

11. A method of manufacturing an aluminum alloy cast rod using a horizontal continuous casting apparatus according to claim 1 , wherein the molten alloy is continuously supplied from one end side of the mold to the hollow portion, cooling water is supplied to the cooling water cavity, and the molten alloy is cooled and solidified under a condition that a heat flux value per unit area in the cooling wall is 10×10 5 W/m 2 or more to manufacture the aluminum alloy cast rod.

12. The method according to claim 11 , wherein the heat flux value per unit area is 10×10 5 W/m 2 to 50×10 5 W/m 2 .