Device and method for preparing large-diameter semi-solid alloy billet

A semi-solid, large-diameter technology, applied in the field of semi-solid alloy processing, can solve problems such as poor reliability of continuous work, small size of billet preparation, and difficulty in industrialization, so as to achieve a wide range of applicable alloys, reduce billet cracking, and improve surface quality. quality effect

Active Publication Date: 2015-11-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex structure, poor continuous operation reliability, small size of blank preparation and difficulty in industrialization existing in the existing semi-solid billet preparation device, and to provide a device and method for preparing semi-solid alloy billets. The combination of collecting crucible and continuous casting equipment realizes the production of large diameter semi-solid alloy blanks

Method used

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  • Device and method for preparing large-diameter semi-solid alloy billet
  • Device and method for preparing large-diameter semi-solid alloy billet

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Embodiment 1: Preparation of large-diameter semi-solid A380 aluminum alloy billet, the steps are as follows:

[0069] (1-1) The liquidus and solidus temperatures of the die-casting A380 aluminum alloy used in the test are 596°C and 521°C, respectively, and the A380 aluminum alloy ingot is placed in a crucible resistance furnace with a preheating temperature of 300°C. The temperature is raised to 680°C and refined after complete melting. Use a bell jar to press the dried hexachloroethane into the bottom of the melt. The amount added is 0.5% of the total weight of the alloy liquid. Shake gently to remove the alloy melt Gas, slag removal and refining treatment, and finally the alloy melt is cooled to 620°C and then kept warm.

[0070] (1-2) Set the width of the annular gap formed between the inner wall of the pulping chamber and the outer wall of the stirring rod of the semi-solid alloy billet preparation device in this embodiment to be 50 mm, and the angle formed at the c...

Embodiment 2

[0071] Embodiment 2: preparing large-diameter semi-solid 7075 aluminum alloy billet, comprising the following steps:

[0072] (2-1) The liquidus and solidus temperatures of the 7075 aluminum alloy used in the test are 635°C and 477°C, respectively. Put the 7075 aluminum alloy ingot into a crucible resistance furnace with a preheating temperature of 350°C, The temperature is raised to 720°C and refined after complete melting. Press the dried hexachloroethane into the bottom of the melt with a bell jar. The amount added is 0.5% of the total weight of the alloy liquid. Shake gently to remove the alloy melt. Gas, slag removal and refining treatment, and finally the alloy melt is cooled to 660°C and then kept warm.

[0073] (2-2) Set the width of the annular gap formed between the inner wall of the pulping chamber and the outer wall of the stirring rod of the semi-solid alloy billet preparation device in this embodiment to be 70 mm, and the angle formed at the connection between th...

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Abstract

The invention provides a device and method for preparing a large-diameter semi-solid alloy billet. The device comprises a material pouring crucible used for containing molten alloy, a slurrying chamber, a stirring rod and an air duct, and the material pouring crucible is linked with the upper end of the slurrying chamber; the stirring rod is arranged in the slurrying chamber, and a cavity for containing semi-solid alloy slurry is formed between the outer wall of the stirring rod and the inner wall of the slurrying chamber; the stirring rod is of a hollow structure, and the air duct is inserted into the stirring rod; and a slurry outlet is formed in the bottom of the slurrying chamber, and the lower portion of the slurrying chamber is combined with a large-diameter collection crucible used for containing the semi-solid alloy billet. According to the device and method for preparing the large-diameter semi-solid alloy billet, strong stirring and rapid cooling of the molten alloy can be achieved by adjusting an interval between the outer wall of the stirring rod and the inner wall of the slurrying chamber, the ventilation amount in the air duct and the stirring speed of the stirring rod, the prepared semi-solid slurry directly outflows from the slurry outlet formed in the bottom of the slurrying chamber, the outflow velocity of the slurry can be precisely controlled by moving the stirring rod in the axial direction, the preparation volume of the semi-solid slurry is not limited by the size of the slurrying chamber, and the preparation efficiency of the slurry is high.

Description

technical field [0001] The invention belongs to the field of semi-solid alloy processing, and in particular relates to a device and method for preparing large-diameter semi-solid alloy blanks. Background technique [0002] Since M.C.Flemings and other researchers at the Massachusetts Institute of Technology invented the semi-solid metal forming technology in the 1970s, the preparation and forming of semi-solid metal paste has attracted widespread attention and research from scholars all over the world. Semi-solid metal forming technology is divided into rheological forming and thixoforming, among which semi-solid thixoforming technology is a precision and near-net forming technology that inherits the comprehensive advantages of casting and forging processes. Compared with traditional liquid die casting, thixoforming has the advantages of low forming temperature, high product precision, long mold life, excellent structure and high mechanical properties. Compared with solid-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00
Inventor 康永林祁明凡朱国明廖万能
Owner UNIV OF SCI & TECH BEIJING
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