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Method and equipment for preparing semi-solid metal slurry/blank with current

A semi-solid metal and billet technology, which is applied in the field of metal materials and metallurgy, can solve the problems that limit the progress of semi-solid forming technology, the life of the stirring rod is low, and it is easy to introduce inclusions, so as to achieve large market promotion value and reduce phase change activation. Can achieve uniform distribution effect

Active Publication Date: 2013-06-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned composite preparation process can combine the advantages of stirring and controlled pouring, there are inherent shortcomings such as low life of the stirring rod, easy introduction of inclusions, and high energy consumption to varying degrees, which greatly limit the progress of semi-solid forming technology.

Method used

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  • Method and equipment for preparing semi-solid metal slurry/blank with current
  • Method and equipment for preparing semi-solid metal slurry/blank with current
  • Method and equipment for preparing semi-solid metal slurry/blank with current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] ZL101 aluminum alloy liquidus temperature T L =585.5℃, solidus temperature T S = 515.8°C. First, the alloy is melted in a resistance furnace, refined with hexafluoroethane at 650°C, left to stand for 15 to 30 minutes, then skimmed, refined into a semi-solid metal slurry / billet mother liquor 9, placed in the mother liquor crucible 1, and the temperature is controlled at In the range of 595°C to 615°C.

[0043] use figure 1 The process flow and equipment shown. Pour the semi-solid metal slurry / billet mother liquor 9 into the launder 2, and under the action of gravity, the semi-solid metal slurry / bill mother liquor 9 flows into the heat preservation crucible 6 by itself, and completes the cooling process in the launder 2, and the heat preservation crucible 6 is placed In the holding furnace 3, the temperature of the mother liquor is controlled within the range of 560°C to 580°C.

[0044] The current treatment device 7 adopts a direct current of 10A to conduct current ...

Embodiment 2

[0048] A390 aluminum alloy liquidus temperature T L =615.6℃, solidus temperature T S = 567.5°C. First, the alloy is melted in a resistance furnace, refined with hexafluoroethane at 720°C, left to stand for 15 to 30 minutes, then skimmed, refined into a semi-solid metal slurry / billet mother liquor 9, placed in the mother liquor crucible 1, and the temperature is controlled at In the range of 635°C to 655°C.

[0049] use figure 2 The process flow and equipment shown. Pour the semi-solid metal slurry / billet mother liquor 9 into the launder 2, and under the action of gravity, the semi-solid metal slurry / bill mother liquor 9 flows into the heat preservation crucible 6 by itself, and completes the cooling process in the launder 2, and the heat preservation crucible 6 is placed In the holding furnace 3, the temperature of the semi-solid metal slurry / billet mother liquor 9 is controlled within the range of 610°C to 630°C.

[0050] One electrode of the current processing device 7...

Embodiment 3

[0054] Liquidus T of AZ91D magnesium alloy L =595℃, solidus temperature T S = 470°C. First the alloy is melted in a resistance furnace, made of 2% SF 6 +CO 2 Protect, refine with JDMJ refining agent at 740°C, stand still for 10-30min, then carry out bottom removal and slag skimming, and refine into semi-solid metal slurry / billet mother liquor 9, place in mother liquor crucible 1, and semi-solid metal slurry / bill mother liquor The temperature of 9 is controlled within the range of 615°C to 635°C.

[0055] use figure 1 The process flow and equipment shown. The mother liquor is poured into the launder 2, under the action of gravity, the mother liquor flows into the heat preservation crucible 6 by itself, and the cooling process is completed in the launder 2. The holding crucible 6 is placed in the holding furnace 3, and the temperature of the mother liquor is controlled within the range of 590°C to 620°C.

[0056] The current treatment device 7 uses an alternating current ...

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Abstract

The invention discloses a method and equipment for preparing semi-solid metal slurry / blank with the current. The follow-up process of the method comprises the following steps: (1) refining an alloy to lead in a heat preserving furnace, controlling the temperature of the metal slurry / blank to 0-10 DEG C above the liquidus temperature TL; (2) performing current treatment on the metal slurry / blank for 0-30 minuntes, wherein the temperature of the heat preserving furnace is controlled to (TL-5)-(TL+5) DEG C; (3) cooling the treated metal slurry / blank to a temperature ranging from TSS (semi-solid forming temperature)-5 DEG C to TSS+5 DEG C, keeping the temperature of the metal slurry / blank for 0-30 minuntes, and injecting the metal slurry / blank in a die cavity to form. The equipment comprises a mother liquor crucible, a chute, the heat preserving furnace, a furnace cover, a thermocouple, a heat preserving crucible, a current treatment device, a power supply, a bin, a punch and the die cavity. The method integrates the controlled pouring method with the current solidification technology, has the advantages of simple process, fine product structure and high spheroidization rate, and can be used to prepare the semi-solid slurry / blanks of different alloys of magnesium, aluminum, tin, copper and the like and be particularly suitable for the preparation of the semi-solid magnesium alloy slurry / blank.

Description

technical field [0001] The invention relates to a metal preparation device and method, in particular to a method and device for preparing semi-solid metal slurry / blank by electric current suitable for the semi-solid forming process of metal materials, especially suitable for the semi-solid forming process of magnesium alloys, and belongs to metal materials and metallurgical technology. Background technique [0002] Semi-solid metal forming has many unique advantages, such as near (net) final forming, high product quality and high-performance process energy saving, etc., and is known as one of the most promising metal material processing technologies in the 21st century. According to different process methods, semi-solid forming technology can be divided into two categories: rheological forming and thixoforming. The rheological forming process is short and can significantly increase the production capacity of enterprises, so it has been widely used in industrial production. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00C22C23/00
Inventor 吴国华庞松刘文才张鹏丁文江
Owner SHANGHAI JIAO TONG UNIV
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