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A semi-continuous casting device and method for group frequency ultrasonic magnesium alloy

A magnesium alloy, semi-continuous technology, applied in the direction of casting equipment, casting melt containers, manufacturing tools, etc., can solve the problems of low cavitation intensity, sound pressure attenuation, etc., and achieve the improvement of cavitation intensity, reduction of oxidation, and cavitation The effect of range enhancement

Active Publication Date: 2021-02-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a semi-continuous casting device and method for a group-frequency ultrasonic magnesium alloy, aiming at the existing single-frequency ultrasonic resonance frequency drift, serious sound pressure attenuation, and low cavitation intensity, which are not enough to fully utilize the ultrasonic field in magnesium alloy melting. In order to solve the problem of advantages in the body, two ultrasonic generating devices are used, and group frequency ultrasonic is applied through the control device to realize the coupling and superposition of sound waves, enhance the effect of cavitation and acoustic flow, improve the structure of magnesium alloy, and improve the quality of ingots

Method used

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  • A semi-continuous casting device and method for group frequency ultrasonic magnesium alloy
  • A semi-continuous casting device and method for group frequency ultrasonic magnesium alloy
  • A semi-continuous casting device and method for group frequency ultrasonic magnesium alloy

Examples

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Effect test

Embodiment 1

[0070] The structure of the group frequency ultrasonic magnesium alloy semi-continuous casting device is as follows: figure 1 and figure 2 Shown, comprise melting furnace 7, tundish 16 and crystallizer 5, be provided with pipette 8 between smelting furnace 7 and tundish 16, be provided with chute 17 between tundish 16 and crystallizer 5;

[0071] The top of the crystallizer 5 is provided with a protective gas annular pipe 6, and the inside of the protective gas annular pipe 6 is connected with the protective gas source through a pipeline. The protective gas annular pipe 6 is provided with an air outlet, and the air outlet faces the axis of the crystallizer;

[0072] The tundish is provided with a first ultrasonic generating device and a second ultrasonic generating device, the first ultrasonic generating device is composed of a first ultrasonic radiation rod 14, a first ultrasonic guiding rod 13 and a first ultrasonic transducer 12, and the second ultrasonic generating device...

Embodiment 2

[0090] Device structure is the same as embodiment 1, and difference is:

[0091] (1) The support device is a variable-angle support device with a structure such as image 3 and Figure 4 Shown, comprise variable angle supporting device crossbeam 27, guide bar 25, elevating device and angle adjusting device; 26 passes through the crossbeam 27 of the variable angle support device and is threadedly connected with the crossbeam 27 of the variable angle support device, and the bottom of the variable angle support device screw rod 26 is connected with one end of the two connecting rods 22 through the bearing 30; the other end of each connecting rod 22 is fixed There is a strut 24 with a dovetail groove 34, and a horizontal channel is provided in the dovetail groove 34 for the horizontal movement of the wheel shaft; two guide rods 25 respectively pass through a connecting rod 22 and are slidably connected with the connecting rod 22; The supporting device slider 31 is respectively s...

Embodiment 3

[0105] Device structure is the same as embodiment 1, and difference is:

[0106] Ultrasonic transducer structure such as Figure 8 As shown in (b), two sets of titanate piezoelectric ceramic materials are arranged in each transducer box;

[0107] Method is with embodiment 1, and difference is:

[0108] (1) Preparation Magnesium alloy ingot;

[0109] (2) The temperature of the magnesium alloy melt is 50°C above the liquidus line of the magnesium alloy;

[0110] (3) The tundish, the pipette, the first ultrasonic radiation rod and the second ultrasonic radiation rod are preheated to the same temperature as the magnesium alloy melt;

[0111] (4) The frequencies of ultrasonic waves emitted by the first ultrasonic radiation rod and the second ultrasonic radiation rod are 30 kHz and 35 kHz respectively; the bottom ends of the first radiation rod and the second radiation rod are located 30 mm below the liquid surface.

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Abstract

A group-frequency ultrasonic magnesium alloy semi-continuous casting device and method, the device includes a tundish, and two ultrasonic generating devices are arranged in the tundish, and the front end surface of the ultrasonic radiation rod of the ultrasonic generating device is located in the tundish; the transducer and the supporting device Assembled together; the support device is a lifting support device or a variable angle support device; the method is: (1) smelting the magnesium alloy melt; (2) preheating the tundish, pipette and two ultrasonic radiation rods; inserting the ultrasonic radiation rod Tundish, or insert into the tundish after adjusting the angle; (3) The magnesium alloy melt is transported to the tundish; the ultrasonic generator is turned on, and the two ultrasonic radiation rods emit ultrasonic waves, which are combined to form a group frequency ultrasonic wave; (4) The crystallizer is turned on; (5) After applying group-frequency ultrasonic waves, the magnesium alloy melt in the tundish is transported to the crystallizer for semi-continuous casting. The device and method of the invention can enhance the nonlinear coupling of sound waves, improve the cavitation range and cavitation intensity of the melt, and obtain large-scale magnesium alloy ingots with uniform structure and excellent performance.

Description

technical field [0001] The invention belongs to the technical field of light alloy smelting, and in particular relates to a semi-continuous casting device and method for a group-frequency ultrasonic magnesium alloy. Background technique [0002] As the lightest structural metal material, magnesium alloy is widely used in the fields of 3C, aerospace, and high-speed trains. It has the advantages of high specific strength, high specific modulus, and good shock absorption performance; Defects such as developed dendrites, severe segregation, and low ingot strength caused by latent heat lead to poor formability and limit the application range of magnesium alloys. Therefore, high-strength fine-grained homogeneous magnesium alloy ingots have become a research hotspot in the field of magnesium alloys. . [0003] The semi-continuous casting method has become the main method for the production of magnesium alloy ingots due to its high efficiency and low production cost. However, the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/114B22D41/00
CPCB22D11/114B22D41/00
Inventor 乐启炽宁少晨陈星瑞胡成路李小强宝磊
Owner NORTHEASTERN UNIV LIAONING
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