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Horizontal continuous light alloy casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave

A synergistic, light alloy technology, applied in the field of light alloy casting, can solve the problems of difficult to eliminate the coarse grain area and dendrite area of ​​the ingot, unable to realize the full volume effect of the melt, coarse grains, etc., and achieve the size effect of microstructure solidification. Remarkable, excellent internal structure, coarse grain effect

Inactive Publication Date: 2007-08-22
NORTHEASTERN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The single application of the two external fields cannot realize the full-volume action of the melt, and it is difficult to completely eliminate the coarse-grained and dendritic regions of the ingot, especially for materials with developed dendrites and coarse grains, which are likely to cause internal stress and have a serious tendency to crack Large ingots are more difficult

Method used

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  • Horizontal continuous light alloy casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave
  • Horizontal continuous light alloy casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave
  • Horizontal continuous light alloy casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave

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Effect test

Embodiment 1AZ91

[0024] Embodiment 1 AZ91 magnesium alloy Φ120mm ingot horizontal continuous casting

[0025] AZ91 magnesium alloy is smelted according to the ratio, and 2% Ca is added to achieve flame retardancy; the melt is not treated in the tundish with ultrasonic treatment, and the synergistic effect of power ultrasonic field and low-frequency electromagnetic field is applied in the crystallizer.

[0026] The casting process conditions are: the casting speed is 120mm / min; the Φ20mm ultrasonic horn is made of high-temperature cobalt-based alloy; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 10W / cm 2 ;The melt temperature in the tundish is 680℃~690℃; the AC frequency is 25Hz, and the intensity is 5000AT.

[0027]Fig. 4 is a comparison of microstructures of AZ91 magnesium alloy Φ120mm ingots obtained by traditional horizontal continuous casting, low-frequency electromagnetic horizontal continuous casting, and the present invention's method of low-frequency electrom...

Embodiment 2

[0029] Example 2: Horizontal continuous casting of ZK60 magnesium alloy Φ80mm billet

[0030] The ZK60 magnesium alloy is smelted according to the ratio, and 20ppm Be is added to achieve flame retardancy; the melt is not treated in the tundish with ultrasonic treatment, and the synergistic effect of power ultrasonic field and low-frequency electromagnetic oscillation field is applied in the crystallizer.

[0031] The casting process conditions are: the casting speed is 160mm / min; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 10W / cm 2 The temperature of the melt in the tundish is 690°C to 700°C; the AC electromagnetic frequency is 30Hz, the intensity is 3200AT, and the DC electromagnetic field intensity is 3200AT.

[0032] Fig. 5 is a comparison of microstructures of ZK60 magnesium alloy Φ80mm ingots obtained by three methods of traditional horizontal continuous casting, low-frequency electromagnetic oscillation horizontal continuous casting and the p...

Embodiment 3

[0034] Example 3: Horizontal continuous casting of a 7XXX aluminum alloy Φ150mm billet

[0035] A 7XXX aluminum alloy is smelted according to the ratio, and undergoes degassing and purification operations; the melt has no ultrasonic treatment in the tundish, and the synergistic effect of power ultrasonic field and low-frequency electromagnetic oscillation field is applied in the crystallizer.

[0036] The casting process conditions are: the casting speed is 110mm / min; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 10W / cm 2 ;The melt temperature in the tundish is 700℃~710℃; the AC frequency is 25Hz, and the intensity is 12000AT.

[0037] Fig. 6 is a comparison of the structure of the 7XXX aluminum alloy Φ150mm ingot obtained by the three methods of traditional horizontal continuous casting, low-frequency electromagnetic oscillation horizontal continuous casting and the present invention's horizontal continuous casting of low-frequency electromagnetic o...

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Abstract

The present invention is horizontal continuous light alloy casting process and apparatus with cooperation of power ultrasonic wave and low frequency electromagnetic wave. In the continuous casting apparatus, one set of exciting windings is set inside the water jacket and applied with AC power to produce low frequency electromagnetic field, or one set of exciting windings is set inside the water jacket while one other set of exciting windings is set between the crystallizer and the pouring basket to produce electromagnetic fields. At the same time, one ultrasonic rod is inserted into the crystallizer to apply power ultrasonic field during casting. The present invention can reduce the temperature gradient in casting blank solidification, alter liquid hole shape, raise the homogeneity of the casting blank and raise casting blank quality.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and in particular relates to a method and equipment for horizontally continuous casting of light alloy through the synergistic effect of two external fields, applied power ultrasonic and low-frequency electromagnetic. Background technique [0002] Horizontal continuous casting technology can realize continuous casting and has the advantages of high production efficiency and high automation level. However, due to the difference in the upper and lower contact pressure and cooling water intensity caused by the gravity field, the primary cooling and secondary cooling of the billet have high-level unevenness. Therefore, the ingot prepared by this method not only has problems such as coarse grains, easy thermal cracking and loose structure, but also has serious structural differences and macro segregation in the high direction. Therefore, the horizontal continuous casting of light alloys is ...

Claims

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Application Information

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IPC IPC(8): B22D11/115
Inventor 乐启炽崔建忠赵志浩张志强
Owner NORTHEASTERN UNIV
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