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Method and device for preparing semisolid metal slurry by mixing vibration

A semi-solid metal and slurry technology, which is applied in the field of semi-solid processing and casting of metals, can solve the problem of inappropriate preparation of semi-solid metal slurry, high cost of semi-solid slurry and billet, and difficulty in preparing solid fraction slurry, etc. problem, to achieve the effect of efficient preparation, reduced preparation cost and short time

Inactive Publication Date: 2010-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electromagnetic stirring also has disadvantages: low efficiency, high power consumption, high cost of semi-solid slurry and billet, and difficulty in preparing slurry with high solid phase rate
Most of the direct effects of ultrasonic waves are concentrated on the melt near the end face of the horn, and the effect on the melt near the container wall is weak. It needs to be equipped with high-power equipment to achieve the ideal effect, and it is not suitable for preparing semi-solid metal paste for larger workpieces.

Method used

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  • Method and device for preparing semisolid metal slurry by mixing vibration
  • Method and device for preparing semisolid metal slurry by mixing vibration
  • Method and device for preparing semisolid metal slurry by mixing vibration

Examples

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Effect test

example 1

[0045] Preparation of semi-solid parts by using ZL101 aluminum alloy for mixed vibration. The liquidus temperature of ZL101 aluminum alloy is 616°C and the solidus temperature is 567°C. The alloy is melted in a heating furnace and heated to 740°C, refined and degassed for later use. The temperature of the alloy liquid is maintained at about 660°C by means of a temperature control device. Take an appropriate amount of alloy liquid, import it into the slurry container, use the temperature control system (heating furnace 4, thermocouple 6 and temperature controller 3) to control the temperature of the melt at 610°C, and the cooling rate of the melt is 0.1-3°C / s .

[0046] Insert the ultrasonic vibration head 10 into the place 15mm below the liquid level of the aluminum alloy in the slurry container ( figure 1 ), simultaneously turn on ultrasonic vibration and low-frequency mechanical vibration, and perform mixed vibration on the molten metal. Ultrasonic vibration frequency is...

example 2

[0048] The semi-solid slurry was prepared by mixing and vibrating Al-20Si-2.0Cu-0.4Mg-1.0Ni high-silicon aluminum alloy. Al-20Si-2.0Cu-0.4Mg-1.0Ni high-silicon aluminum alloy has a liquidus temperature of 700°C and a solidus temperature of 535°C. The alloy is melted in a heating furnace and heated to 850°C, refined and degassed for later use. The temperature of the alloy liquid is kept at about 740°C by means of a temperature control device. Take an appropriate amount of alloy liquid and pour it into a slurry crucible ( figure 1 ), using a temperature control device to control the temperature of the alloy liquid at 720°C, and the melt cooling rate at 0.1-3°C / s.

[0049] Lower the ultrasonic vibration head 10 to 15 mm below the liquid level of the high-silicon aluminum alloy in the slurry container 5, and simultaneously turn on the ultrasonic vibration and low-frequency mechanical vibration to perform mixed vibration on the molten metal. Ultrasonic vibration frequency is 25k...

example 3

[0051] Preparation of semi-solid parts by using ZL104 aluminum alloy for mixed vibration. The liquidus temperature of ZL104 aluminum alloy is 610°C and the solidus temperature is 565°C. The alloy is melted in a heating furnace and heated to 740°C, refined and degassed for later use. The temperature of the alloy liquid is maintained at about 660°C by means of a temperature control device. Take an appropriate amount of alloy liquid, import it into the slurry container, use the temperature control system (heating furnace 4, thermocouple 6 and temperature controller 3) to control the temperature of the melt at 600°C, and the cooling rate of the melt is 0.1-3°C / s .

[0052] Insert the ultrasonic vibrating head 10 into the place 10mm below the liquid level of the aluminum alloy in the slurry container ( figure 1 ), simultaneously turn on ultrasonic vibration and low-frequency mechanical vibration, and perform mixed vibration on the molten metal. Ultrasonic vibration frequency is...

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Abstract

The invention belongs to the technical field of metal semisolid processing, relating to a method and a device for preparing semisolid metal slurry by mixing vibration. A slurry containing container is tightly fixed on a mechanical vibration table, and superheating molten metal 0-40 DEG C higher than the liquidus is poured into the slurry containing container of which the temperature is lower than molten metal temperature. An ultrasonic vibrator is lowered below the molten metal liquid level for 1-25 mm and simultaneously starts low-frequency mechanical vibration and supersonic vibration; after performing mixing vibration for certain time, the molten metal is controlled to be 5-30 DEG C below the liquidus temperature to obtain the semisolid metal slurry of which the solid phase rate is 5-40%. The semisolid metal slurry prepared with the method has fine primary and round grain and even distribution. The device of the invention comprises a slurry containing container, an attemperation unit, a supersonic generating and controlling unit, a low-frequency mechanical vibration generating and controlling unit and a lifting unit. The invention can be used for preparing semisolid slurry of various alloy parts, such as aluminium, magnesium, stannum, copper, zinc and the like as well as used for forming parts.

Description

technical field [0001] The invention belongs to the technical field of semi-solid processing and casting of metals, and relates to a method and a device for preparing semi-solid metal slurry by applying mixed vibration. The invention can be used for semi-solid slurry preparation and part forming of various alloy parts such as aluminum, magnesium, tin, copper and zinc. technical background [0002] Semi-solid forming technology is a special process technology for forming alloys between the liquidus and solidus temperatures. Its basic principle is to apply violent stirring or disturbance during the solidification process of liquid metal, or change the heat of the metal. State, or adding grain refiner, or rapid solidification, change the nucleation and growth process of the primary solid phase, to obtain a uniform, fine, equiaxed alloy slurry with non-dendritic structure characteristics. Under the action of external force, the obtained alloy slurry still has good fluidity even...

Claims

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Application Information

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IPC IPC(8): B22D18/02
Inventor 吴树森钟鼓万里安萍毛有武
Owner HUAZHONG UNIV OF SCI & TECH
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