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Variable frequency ultrasonic semi-continuous casting method for magnesium alloy

A frequency conversion ultrasonic and magnesium alloy technology, applied in the field of light alloy processing, can solve the problems of limited ultrasonic field action range, unfavorable production of large-diameter ingots, change of melt resonant frequency, etc. The effect of resonance and mechanical properties improvement

Inactive Publication Date: 2017-08-25
NORTHEASTERN UNIV +1
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the severe attenuation of the ultrasonic field in the magnesium alloy melt, the range of action of the ultrasonic field is limited, so that the range of action is limited to a small area near the ultrasonic emitting surface, which is not conducive to the production of large-diameter ingots
At the same time, since the physical parameters of the melt in semi-continuous casting production are not constant, the resonant frequency of the melt will change. The existing fixed-frequency ultrasonic field is difficult to overcome the weakening of the acoustically induced nonlinear effect due to the change of the resonant frequency. The phenomenon
Therefore, the effects of grain refinement and uniform structure brought by the ultrasonic field cannot be fully utilized.

Method used

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  • Variable frequency ultrasonic semi-continuous casting method for magnesium alloy
  • Variable frequency ultrasonic semi-continuous casting method for magnesium alloy
  • Variable frequency ultrasonic semi-continuous casting method for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: ZK60 magnesium alloy Ingot frequency conversion ultrasonic semi-continuous casting

[0064]In this embodiment, each ingredient is melted and refined in an alloy melting furnace according to the ratio of the ZK60 magnesium alloy; casting starts when the temperature of the tundish is 660°C, and an ultrasonic radiation rod is inserted below the liquid surface of the melt during the casting process. The melt is subjected to continuous frequency conversion ultrasonic treatment, and the compressed air in the frequency conversion ultrasonic system is cooled by piezoelectric ultrasonic transducers and eddy current cooling tubes.

[0065] Casting process conditions: casting speed 50mm / min; The 304 stainless steel ultrasonic radiation rod is baked with acetylene to 600°C; the set ultrasonic basic frequency is 21kHz, the frequency change rate is 500 times / second, and the ultrasonic power is 2400W; the cooling water flow rate in the crystallizer is 4.63t / h.

[006...

Embodiment 2

[0069] Embodiment 2: AZ80 magnesium alloy Ingot frequency conversion ultrasonic semi-continuous casting

[0070] In this example, the AZ80 magnesium alloy is smelted according to the ratio; casting starts when the temperature of the tundish is 670°C, and continuous frequency conversion ultrasonic treatment is applied to the melt during the casting process. Compressed air in the system for cooling.

[0071] Casting process conditions: casting speed: 30mm / min, will The 304 stainless steel ultrasonic radiation rod is baked with acetylene to 610°C; the set ultrasonic basic frequency is 25kHz, the frequency change rate is 300 times / second, and the ultrasonic power is 6000W; the cooling water flow rate in the crystallizer is 11.3t / h.

[0072] Fig. 11 (a)~(d) are traditional DC casting, traditional single-frequency ultrasonic semi-continuous casting and the present invention figure 1 The AZ80 magnesium alloy cast by the frequency conversion ultrasonic semi-continuous casting met...

Embodiment 3

[0074] Embodiment 3: ZK60 magnesium alloy Ingot frequency conversion ultrasonic semi-continuous casting

[0075] In this embodiment, each ingredient is melted and refined in an alloy melting furnace according to the ratio of the ZK60 magnesium alloy; casting starts when the temperature of the tundish is 660°C, and an ultrasonic radiation rod is inserted below the liquid surface of the melt during the casting process. The melt is subjected to continuous frequency conversion ultrasonic treatment, and the compressed air in the frequency conversion ultrasonic system is cooled by piezoelectric ultrasonic transducers and eddy current cooling tubes.

[0076] Casting process conditions: casting speed: 40mm / min, will The 304 stainless steel ultrasonic radiation rod is baked with acetylene to 600°C; the set ultrasonic basic frequency is 15kHz, the frequency change rate is 20 times / second, and the ultrasonic power is 4000W; the cooling water flow rate in the crystallizer is 5.34t / h. ...

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Abstract

The invention belongs to the field of light alloy machining, and particularly relates to a variable frequency ultrasonic semi-continuous casting method for magnesium alloy. The method comprises the steps of alloy smelting, melt delivery and consolidation forming under ultrasonic treatment. Magnesium alloy melt is treated in a real-time variable frequency ultrasonic field introduced in the semi-continuous casting process, and the quasi real-time tracking of the resonant frequency of metal melt is achieved; and liquid cave melt is subjected to the ultrasonic resonance treatment continuously in the whole semi-continuous casting process, so that the continuous ultrasonic high-efficiency treatment of the magnesium alloy melt is achieved in the solidification process. In the method provided by the invention, an ultrasonic radiation rod is extended into the magnesium alloy melt in the magnesium alloy semi-continuous casting process, so that the cavitation effect and acoustic streaming effect produced by the variable frequency ultrasonic field directly act on the magnesium alloy melt solidifying. With the method provided by the invention, the magnesium alloy solidification behavior can be changed obviously, the structure is refined, and the uniformity of the billet solidification structure as well as the mechanical property of magnesium alloy billets are improved; and the billet casting defects are reduced obviously, and the quality of the magnesium alloy billets is improved greatly.

Description

technical field [0001] The invention belongs to the field of light alloy processing, in particular to a magnesium alloy frequency conversion ultrasonic semi-continuous casting method. [0002] technical background [0003] Magnesium alloy has the advantages of light density, high specific strength and specific stiffness, good electromagnetic shielding, good damping performance, etc., making it widely used in many fields such as transportation, aerospace, national defense technology and 3C electronics, and is known as "21 The green engineering material of the century". [0004] Semi-continuous casting is the main production method of magnesium alloy ingots at present. Its basic principle is to introduce the magnesium alloy melt into the crystallizer cooled by circulating water. It is pulled out and water spray cooling is continued until an ingot is formed. Semi-continuous casting has the advantages of high productivity, low casting cost and simple operation. [0005] Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/114B22D11/16
CPCB22D11/114B22D11/001B22D11/16
Inventor 乐启炽陈星瑞廖启宇宝磊王彤
Owner NORTHEASTERN UNIV
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