Method for continuous casting of light-alloy ingots

• US 4,564,059 A
• Filed: 12/23/1983
• Issued: 01/14/1986
• Est. Priority Date: 06/13/1981
• Status: Expired due to Fees

• Current Assignee: Administrator, By Anna A. Silaeva, Alexandr I. Matveev, Andrei D. Andreev, Boris I. Bondarev, Deceased, Petr N. Silaeva, Gennady S. Makarov, Gennady V. Cherepok, Georgy I. Eskin, Pavel E. Khodakov, Petr N. Shvetsov, Robert R. Malinovsky, Stella I. Borovikova, Viktor A. Danilkin, Viktor K. Junyshev, Vladimir I. Dobatkin, Vladimir M. Baranchikov
• Original Assignee: Administrator, By Anna A. Silaeva, Alexandr I. Matveev, Andrei D. Andreev, Boris I. Bondarev, Deceased, Petr N. Silaeva, Gennady S. Makarov, Gennady V. Cherepok, Georgy I. Eskin, Pavel E. Khodakov, Petr N. Shvetsov, Robert R. Malinovsky, Stella I. Borovikova, Viktor A. Danilkin, Viktor K. Junyshev, Vladimir I. Dobatkin, Vladimir M. Baranchikov
• Inventors: Khodakov, Pavel E., Cherepok, Gennady V., Malinovsky, Robert R., Shvetsov, Petr N., Silaeva, administrator, by Anna A., Junyshev, Viktor K., Makarov, Gennady S., Danilkin, Viktor A., Silaeva, deceased, Petr N., Eskin, Georgy I., Baranchikov, Vladimir M., Dobatkin, Vladimir I., Bondarev, Boris I., Matveev, Alexandr I., Borovikova, Stella I., Andreev, Andrei D.
• Primary Examiner(s): Lin, Kuang Y.
• Application Number:
  US06/565,140
• Time in Patent Office: 753 Days
• Field of Search: 164/501, 164/511, 164/260, 164/416, 164/478, 164/71.1
• US Class Current: 164/478
• CPC Class Codes: B22D 11/114 by using agitating or vibrating means B22D11/117 takes precedence

Abstract

A method for continuous casting of light-alloy ingots, consisting in pouring a melt, acting upon the melt with ultrasound using at least one radiator to purify the melt and to refine the structure of the solidifying ingot, the radiation being applied uniformly throughout the cross-section of the melt in an intensity of 2 to 60 W/cm² depending on the cross-sectional area of the solidifying ingot, the radiator being immersed into the melt to a depth equal to between 1/12 and 1/4 of the sound wavelength in the material of the melt and the melt temperature being maintained by 60° to 150° C. above the liquidus temperature of the melt, and subsequently withdrawing the ingot.

Claims

1. A method for continuous casting of a light-alloy ingot, comprising:

pouring a melt material into a continuous casting mold,

applying an ultrasonic action to said melt by means of at least one radiator for purifying said melt and refining the structure of said ingot solidifying from said melt;

said ultrasonic action being effected uniformly throughout the cross-section of said melt to form a cavitation zone, h, at an intensity of 2 to 60 W/cm² depending on the cross-sectional areas of said solidifying ingot, said radiator being immersed in said melt to a depth of 1/12 to 1/4 of the sound wavelength in said melt material, the temperature of said melt material being maintained between 60 to 150°

C. above the liquidus temperature of said melt material wherein W≈

S₁ ·

h; and

withdrawing ingot now having an extra refined structure.

2. A method according to claim 1, wherein said melt is purified by causing it to pass th rough a porous material, the distance from said radiator to said porous material being maintained equal to 1/12 to 1/4 of the sound wavelength in said material of said melt.

3. The method of claim 1, wherein the size of the cast grain is equal to or less than that of a dendritic cell.

4. The method of claim 1, wherein the radiator is immersed to a depth of about 1/8 of the wavelength of sound in the melt.

5. The method of claim 2, wherein the distance between the radiator and the porous material is 1/8 of the wavelength of sound in the melt.

6. The method of claim 1, wherein the ingot is an alloy containing Al-Zn-Mg-Cu-Zr.

7. The method of claim 1, wherein the liquidus temperature is 625°

C.

8. The method of claim 2, wherein said ingot consists of equiaxial grains.

9. The method of claim 2, wherein the radiator is immersed to a depth of about 1/8 of the wavelength of sound in the melt.

10. The method of claim 9, wherein the distance between the radiator and the porous material is about 1/8 of the wavelength of sound in the melt.

11. The method of claim 10, wherein the ingot is an Al-Cu-Mg alloy.

12. The method of claim 11, wherein said ultrasonic action is effected at a frequency of 18 kHz and at a temperature of 740°

C.

13. The method of claim 6, wherein the size of the cast grain is equal to or less than that of a dendritic cell.

14. The method of claim 2, wherein the radiator is immersed to a depth of about 1/4 of the wavelength.

15. The method of claim 2, wherein the distance between the radiator and the porous material is 1/4 of the wavelength of sound in the melt.

16. The method of claim 8, wherein the ingot is an Al-Cu-Mg alloy.

17. A method for continuous casting of Al-Zn-Mg-Cu-Zr light-alloy ingots, comprising:

pouring a melt and passing the melt through a porous material while maintaining the distance between the radiator and the porous material between 1/12 to 1/4 of the wavelength of the sound in the melt;

applying ultrasound upon said melt with at least one radiator in order to purify said melt and refine a structure of a solidifying ingot from said melt, the ultrasound providing ultrasonic action which is effected uniformly throughout the cross-section of said melt to form a cavitation zone, h at an intensity of 2 to 60 W/cm² as a function of the cross-sectional area, S₁, of said solidifying ingot, wherein W≈

S₁ h;

immersing the radiator into the melt to a depth of 1/12 to 1/4 of the wavelength of the sound of said melt;

maintaining the temperature of the melt between 60 to 150°

C. above the liquids temperature of the material of the melt; and

withdrawing the ingot to produce a cast grain wherein the size of the cast grain is equal to or less than that of a dendritic cell.

18. The method of claim 17, wherein the radiator is immersed to a depth of about 1/8 of the wavelength of sound in the melt.

19. The method of claim 17, wherein the melt is poured through a distributing trough.