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Preparation method and device of semi-solid slurry

A technology of semi-solid slurry and preparation device, which is applied in the field of new semi-solid slurry preparation and semi-solid slurry preparation of light alloys, and can solve the problems of difficult control and operation, inclusion of air in the melt, and easy contamination. , to achieve the effect of short pulping process, simple equipment and long time

Inactive Publication Date: 2012-01-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, many semi-solid pulping methods have the disadvantages that the melt is easy to entrain air, be easily polluted, complex equipment, high energy consumption, high cost, difficult to control and cumbersome to operate.

Method used

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  • Preparation method and device of semi-solid slurry
  • Preparation method and device of semi-solid slurry
  • Preparation method and device of semi-solid slurry

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Clean the smelting tools and dry the paint, the composition of the paint used is 70% CaCO 3 +20% ZnO+10ml water glass+water. Put the ZL101 aluminum alloy into the steel crucible 12 in the resistance furnace 16 for melting. Superheat the molten metal to 700°C, and wait for the temperature to drop to the predetermined temperature range after refining and removing slag. Set the test parameters such as stirring speed, gas flow rate, vibration frequency and amplitude, and the amount of foreign material added.

[0033] When the temperature of the molten metal drops to 650°C, start the lifting motor 2 to lower the crossbeam 5, so that the graphite head 14 and the powder feeding pipe 9 are preheated above the surface of the high-temperature molten metal. When the temperature of the molten metal drops to 620°C, lower the beam 5 to penetrate the preheated graphite head 14, powder feeding pipe 9 and thermocouple 11 into the molten metal, turn on the argon gas and start the rotat...

example 2

[0035] Clean the smelting tools and dry the paint, the composition of the paint used is 70% CaCO 3 +20% ZnO+10ml water glass+water. The AZ91D magnesium alloy is put into the steel crucible 12 in the electric resistance furnace 16 for smelting, and uses shielding gas (CO 2 : SF 6 =100:1) to protect the molten magnesium alloy. Superheat the molten metal to 670°C, and wait for the temperature to drop to the predetermined temperature range after refining and removing slag. Set the test parameters such as stirring speed, gas flow rate, vibration frequency and amplitude.

[0036] When the temperature of the molten metal drops to 630°C, the lifting motor 2 is started to lower the beam 5, so that the graphite head 14 and the powder feeding pipe 9 are preheated above the surface of the high-temperature molten metal. When the temperature of the molten metal drops to 600°C, lower the beam 5 to penetrate the preheated graphite head 14, powder feeding pipe 9 and thermocouple 11 into th...

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Abstract

The invention discloses a preparation method and a device of semi-solid slurry. Three processes of air current stirring, electromagnetic vibration and addition of heterogeneous nucleating agents are comprehensively utilized by the method. A graphite head with holes is connected with a hollow stirring rod, and a rotating motor drives the stirring rod to rotate through gear transmission and drives the graphite head to rotate; gas passes through a sleeve barrel and reaches the graphite head through the hollow stirring rod, and then, the gas overflows out of small holes, thereby realizing the purposes of blowing and stirring the molten metal in a rotating way; an electromagnetic vibration table can realize electromagnetic vibration on the molten metal in a crucible; the heterogeneous nucleating agents are added into the molten metal to promote further spheroidization and refinement of slurry tissues; after the molten metal is smelted, the graphite head is inserted into the molten metal for blowing and stirring the molten metal in a rotating way; and simultaneously, the molten metal is vibrated, and the heterogeneous nucleating agents are added through a powder feeding pipe, thereby preparing the semi-solid slurry with round and smooth primary grains. The prepared semi-solid slurry has the advantages of purity, no pollution, simple used equipment, easy control of process parameters, short pulping processes, small energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of semi-solid slurry preparation, and in particular relates to a novel semi-solid slurry preparation method and device, especially suitable for semi-solid slurry preparation of light alloys such as aluminum and magnesium. Background technique [0002] At present, there are various methods and devices for semi-solid pulping at home and abroad, which can be summarized into two categories: strong stirring and weak stirring. The strong stirring method mainly includes mechanical stirring, electromagnetic stirring, single-roller shear cooling, etc., and the weak stirring method mainly includes inclined cooling and shearing technology, near-liquidus pouring, strain-induced melting activation, etc. Each of these methods has its own advantages as well as its disadvantages. Although the mechanical stirring method in the strong stirring method has simple equipment, it is easy to get involved in gas, the melt is easily...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02
Inventor 董选普张磊李建军樊自田王文俊陈东风魏必明
Owner HUAZHONG UNIV OF SCI & TECH
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