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An air-cooled multi-tube stirring device and method for preparing light alloy semi-solid slurry

A technology for semi-solid slurry and light alloy, which is applied in the field of equipment for preparing light alloy semi-solid slurry by air-cooled multi-tube stirring, and can solve the problem of difficulty in preparing large-volume semi-solid slurry and industrialization promotion, poor reliability of continuous operation, and cleaning. Cumbersome maintenance and other problems, to achieve the effect of easy industrialization and application, a wide range of applicable alloys, and a simple structure

Active Publication Date: 2017-03-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems existing in the existing semi-solid slurry preparation device, such as complex structure, poor continuous operation reliability, low efficiency, cumbersome cleaning and maintenance, and difficulty in the preparation and industrialization of large-volume semi-solid slurry, and provides an air-cooled A device and method for preparing light alloy semi-solid slurry by multi-tube stirring. During the solidification process of the alloy melt, the composite effect of multi-tube stirring and multi-tube cooling accelerates the cooling of the melt and promotes the nucleation of the melt, thereby obtaining a liquid phase matrix Semi-solid slurry with a certain proportion of nearly spherical primary solid phase uniformly distributed in the medium

Method used

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  • An air-cooled multi-tube stirring device and method for preparing light alloy semi-solid slurry
  • An air-cooled multi-tube stirring device and method for preparing light alloy semi-solid slurry
  • An air-cooled multi-tube stirring device and method for preparing light alloy semi-solid slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1: Comparison of A380 aluminum alloy semi-solid slurry prepared by ordinary stirring mechanism, air-cooled single-tube stirring mechanism and air-cooling multi-tube stirring mechanism, the steps are as follows:

[0061] (1-1) The liquidus and solidus temperatures of the A380 die-casting aluminum alloy used in the test are 585°C and 504°C, respectively. The aluminum alloy ingot is placed in a crucible resistance furnace with a preheating temperature of 250°C. Refining after the liquid temperature rises to 690°C, press the dried hexachloroethane into the bottom of the aluminum alloy liquid with a bell jar, the amount added is 0.5% of the total weight of the aluminum alloy liquid, shake gently to degas the melt , slag removal and refining treatment, and finally cool down the aluminum alloy melt to 610°C and keep it warm.

[0062] (1-2) The stirring speed of the multi-tube stirring rod in the preparation device is 400r / min, the air intake in the air duct is 300L / min...

Embodiment 2

[0065] Embodiment 2: Preparation of A356 cast aluminum alloy semi-solid slurry, the steps are as follows:

[0066](2-1) The liquidus and solidus temperatures of the A356 cast aluminum alloy used in the test are 615°C and 556°C, respectively. Put the aluminum alloy ingot into a crucible resistance furnace with a preheating temperature of 300°C, Refining after the liquid temperature rises to 700°C, press the dried hexachloroethane into the bottom of the aluminum alloy liquid with a bell jar, the amount added is 0.5% of the total weight of the aluminum alloy liquid, shake gently to degas the melt , slag removal and refining treatment, and finally cool the aluminum alloy melt to 650°C and keep it warm.

[0067] (2-2) The stirring speed of the multi-tube stirring rod in the preparation device is 400r / min, the air intake in the air duct is 400L / min, the inner diameter of the air duct is 10mm, there are 3 stirring tubes, the wall thickness of the stirring tube is 5mm, and the inner d...

Embodiment 3

[0068] Embodiment 3: Preparation of 7075 deformed aluminum alloy semi-solid slurry, the steps are as follows:

[0069] (3-1) The liquidus and solidus temperatures of the 7075 deformed aluminum alloy used in the test are 635°C and 477°C, respectively. Put the aluminum alloy ingot into a crucible resistance furnace with a preheating temperature of 300°C, Refining after the liquid temperature rises to 720°C, press the dried hexachloroethane into the bottom of the aluminum alloy liquid with a bell jar, the amount added is 0.5% of the total weight of the aluminum alloy liquid, shake gently to degas the melt , slag removal and refining treatment, and finally cool the alloy melt to 660°C and keep it warm.

[0070] (3-2) The stirring speed of the multi-tube stirring rod in the preparation device is 300r / min, the air intake in the air duct is 300L / min, the inner diameter of the air duct is 10mm, there are 3 stirring tubes, the wall thickness of the stirring tube is 5mm, and the inner d...

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Abstract

The invention provides a device and method for preparing light alloy semi-solid slurry through air-cooling multi-tube stirring. The device comprises a crucible for containing light alloy melt, an air-cooling multi-tube stirring mechanism and a lifting mechanism. The air-cooling multi-tube stirring mechanism comprises a stirring mechanism body and an air supply mechanism. The stirring mechanism body is composed of a stirring motor, a multi-tube stirring rod and a bevel gear drive group which are arranged on a lifting platform. The multi-tube stirring rod is supported and positioned through a bearing. The air supply mechanism is composed of an air guide tube and an air supply device. One end of the air guide tube is combined with the air supply device, and the other end of the air guide tube is inserted into the multi-tube stirring rod. Multiple stirring pipes are filled with air entering the air guide tube. The device is simple in structure, convenient to use, high in efficiency, safe, reliable, wide in applicable scope in alloy and especially suitable for preparing large-volume semi-solid alloy slurry, the melt temperature, the stirring speed, the number of the stirring tubes, the inner diameter, the wall thickness, the stirring time and air ventilation quantity can be accurately controlled, and industrial application and popularization are facilitated.

Description

technical field [0001] The invention belongs to the field of semi-solid metal processing, and in particular relates to an air-cooled multi-tube stirring device and method for preparing light alloy semi-solid slurry. Background technique [0002] In the early 1970s, researchers such as M.C. Flemings of the Massachusetts Institute of Technology invented the semi-solid metal forming technology. Since then, the preparation and forming of semi-solid metal paste has attracted widespread attention and research from scholars all over the world. The preparation of semi-solid slurry is the basis and key of semi-solid metal processing technology. semisolid metals" (A.Mitsuru, S.Hiroto, H.Yasunori, et al, EP Patent, 0745694A1, 1996), "a suspension cone type semi-solid metal slurry preparation and delivery device" (Kang Yonglin, Chinese Patent , 200810114097.3, 2008), "Preparation method of semi-solid metal and alloy slurry or billet" (Mao Weimin, Chinese patent, 200410009296.X, 2004), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02B22D27/04
Inventor 康永林祁明凡朱国明廖万能
Owner UNIV OF SCI & TECH BEIJING
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