Method for refining metal solidification structure through combination effect of magnetic field and vibration

A composite effect and metal solidification technology, applied in the field of metal solidification, can solve the problems of poor refinement effect, uneven solidification structure, high energy consumption in the external field, etc., and achieve improved effect, high-efficiency refinement and isotropic growth, and low power consumption. Effect

Active Publication Date: 2018-08-24
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for realizing the refinement of metal solidification structure through the compound action of magnetic field and vibration, so as to solve the problems of poor refinement effect, uneven solidification structure and high external field energy consumption in the control of metal solidification structure at present.

Method used

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  • Method for refining metal solidification structure through combination effect of magnetic field and vibration
  • Method for refining metal solidification structure through combination effect of magnetic field and vibration
  • Method for refining metal solidification structure through combination effect of magnetic field and vibration

Examples

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Effect test

Embodiment 1

[0035] Example 1: Solidification of Aluminum Alloys in a Graphite Form

[0036] Melt preparation: 1kg of 6063 aluminum alloy, 99.7% melted at 720°C;

[0037] Casting mold: Electrode graphite casting mold, baked to 400°C, the size of the graphite casting mold is Φ160×150mm;

[0038]Solidification process: Place the casting mold directly on the vibration device, the vibration device and the support platform are connected by a flexible device, and the vibration device is driven by a high-frequency motor; after the aluminum alloy melt is degassed, when the temperature drops to 700 ° C, the aluminum The alloy melt is poured into the mold and starts to vibrate, so that the mold and the metal melt inside vibrate vertically along with the vibrating device. The vibration frequency is 400Hz and the amplitude is 10 microns. At the same time, an electromagnetic stirring coil is installed outside the mold , Turn on the electromagnetic stirring while vibrating, so that the metal melt moves...

Embodiment 2

[0041] Embodiment 2: Solidification of AZ91 magnesium alloy in copper mold

[0042] Copper casting mold: the size is Φ280×250mm;

[0043] Solidification experiment process: Place the casting mold directly on the vibrating device, the vibrating device and the support platform are connected by a flexible device, and the vibrating device is driven by a high-frequency motor; after the alloy melt is refined, the temperature drops to 610°C and is cast into the casting mold , start to vibrate, so that the mold and the molten metal inside vibrate vertically along with the vibrating device. The frequency of vibration is 500 Hz and the amplitude is 20 microns. At the same time, an electromagnetic stirring coil is installed outside the mold, and the electromagnetic stirring is turned on while vibrating , so that the metal melt moves horizontally and circumferentially to solidify under the action of electromagnetic stirring at the same time, the frequency of the current used for magnetic ...

Embodiment 3

[0047] Example 3: Solidification of steel

[0048] Melt preparation: 10kg of 40Cr alloy steel was melted at 1580°C.

[0049] Casting mold: in a sand mold with a size of Φ280×250mm.

[0050] Place the casting mold directly on the vibrating device, the vibrating device and the support platform are connected by a flexible device, and the vibrating device is driven by a high-frequency motor; after the alloy melt is refined, when the temperature drops to 1520 ° C, it is poured into the casting mold and starts to vibrate. Make the casting mold and the molten metal inside vibrate vertically along with the vibrating device. The frequency of the vibration is 200Hz and the amplitude is 45 microns. At the same time, the melt moves horizontally and circumferentially under the action of electromagnetic stirring until solidification. The frequency of the current used for magnetic stirring is 6Hz, and the magnetic induction intensity in the melt is 400Gs. Until it is completely solidified, ...

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Abstract

The invention provides a method for refining a metal solidification structure through the combination effect of a magnetic field and vibration, and belongs to the technical field of metal solidification control. During a metal melt solidification process, a metal liquid and a casting mould generate high frequency micro-amplitude vibration; meanwhile, the magnetic field is applied to the metal meltand the metal melt is electromagnetically stirred; the metal solidification structure including particles and a precipitated phase is refined through the combination effect of high-frequency vibration and electromagnetic stirring; and the comprehensive property of a metal casting is favorably improved. The method has the obvious advantages that the metal refining effect is more obvious compared with single electromagnetic stirring or single vibration; besides, metals are not polluted; and the method is applicable to solidification structure refining of various metal melts.

Description

technical field [0001] The invention relates to the field of metal solidification, in particular to a method for refining the metal solidification structure by utilizing the compound action of magnetic field and mechanical vibration. Background technique [0002] The solidification structure control of metal materials is an important means to improve the properties of materials, especially the solidification and fine-grained technology of materials has been widely concerned in recent years, and is regarded as one of the main means to improve material properties. The super steel development plan proposed by my country will also crystallize Grain refinement is an important way to realize the preparation of super steel; there are many technologies for solidification fine grain, and the traditional methods include: rapid solidification method, chemical inoculation method and external field control method, etc.; rapid solidification method is limited by cooling intensity It is diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02B22D27/08
CPCB22D27/02B22D27/08
Inventor 王宏明马鸣远李桂荣王旋
Owner JIANGSU UNIV
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