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Method for refining metal solidification structure through complex pulse magnetic oscillation

A pulse magnetic oscillation and metal solidification technology, which is applied in the field of metallurgy and metal material preparation, can solve problems affecting production safety and personal safety, strong fluctuations on the metal surface, splashing, etc., and achieve low equipment prices, increased treatment effects, and large treatment areas. Extended effect

Active Publication Date: 2014-08-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But they also have their own limitations. In the pulse current solidification fine-grain technology, the current passes directly through the metal melt, which will affect production safety and personal safety; and although the pulsed magnetic field does not directly pass through the metal melt, the strong magnetic field is applied to the metal. After melting, an induced current will be generated in the metal melt. When the magnetic field is strong, the strong magnetic field will cause strong fluctuations or even splashes on the metal surface

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  • Method for refining metal solidification structure through complex pulse magnetic oscillation
  • Method for refining metal solidification structure through complex pulse magnetic oscillation
  • Method for refining metal solidification structure through complex pulse magnetic oscillation

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The experimental process is as follows: the melt material is industrial pure aluminum with a purity of 99.7%, the casting mold is water glass sand dry type, the composite coil is a circular flat coil with 15 turns, and the number of layers is 3; the circular solenoid coil The number of turns is 18, the number of layers is 2, and two coils are connected in series. A set of experiments is carried out to keep other variables consistent, and only one variable is controlled, that is, no magneto-oscillation treatment is applied, solenoid coil treatment is applied, and flat coil is applied. Treatment and application of composite coil treatment. The parameters are 39Hz, 50A, 10μs composite magneto-oscillation treatment. The specific process is as follows: After melting pure aluminum, when the metal is overheated at 20-150°C, place the preheated mold in the composite coil, the solenoid coil is fixed on the wall of the sand mold, and the flat coil is placed on the metal liquid su...

Embodiment 2

[0036] The experimental process is as follows: the melt material is industrial pure aluminum with a purity of 99.7%, the casting mold is water glass sand dry type, the composite coil is an oval flat coil with 10 turns, and the number of layers is 1; the oval solenoid tubular coil The number of turns is 14, the number of layers is 2, and two coils are connected in parallel. A set of experiments is carried out, keeping other variables consistent, and only controlling one variable, that is, applying solenoid coil treatment, flat coil treatment and composite coil treatment. The parameters are 300Hz, 1800A, 90μs composite magneto-oscillation treatment. The specific process is as follows: After melting pure aluminum, when the metal is overheated at 20-150°C, place the preheated mold in the composite coil, the solenoid coil is fixed on the wall of the sand mold, and the flat coil is placed on the metal liquid surface About 3cm above, immediately turn on the pulse power switch for pul...

Embodiment 3

[0039] The experimental process is as follows: the melt material is industrial pure aluminum with a purity of 99.7%, the casting mold is water glass sand dry type, the composite coil is a square flat coil with 7 turns, and the number of layers is 2; the square solenoid coil turns is 8, the number of layers is 3, two coils are independently connected to a power supply, and a set of experiments is carried out, keeping other variables consistent, and only controlling one variable, that is, applying solenoid coil treatment, applying flat coil treatment and applying composite Coil handling. It is treated with the composite magneto-induced oscillation with parameters of 1200Hz, 6000A, 300μs. The specific process is as follows: After melting pure aluminum, when the metal is overheated at 20-150°C, place the preheated mold in the composite coil, the solenoid coil is fixed on the wall of the sand mold, and the flat coil is placed on the metal liquid surface About 1cm above, immediatel...

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Abstract

The invention relates to a method for refining a metal solidification structure, and belongs to the technical field of metal material manufacturing. A mosquito-repellent-incense-type flat coil and a solenoid-shaped coil are connected to form a cylinder with the bottom opened, the liquid level of molten metal and the section wall of the molten metal are covered, the effect that the whole outer surface of the molten metal is covered with magnetic fields is achieved and effective refining of the solidification structure is realized. A metal material is molten firstly, then the molten metal is poured into a die placed on a complex pulse magnetic oscillation solidification device, and the molten metal is solidified under the effect of complex pulse magnetic oscillation. According to processing parameters, the pulse current I is 10 amperes to 30000 amperes, the pulse width is 10 microseconds to 100 milliseconds and the acting frequency f is 0.01 hertz to 2 kilohertzs. The method has the advantages that the method is not limited by metal materials, large-size even fine-grain ingot castings can be manufactured, no pollution is generated, energy is saved, equipment is simple, operation is convenient and the cost is low. The method is used for die casting, semi-continuous casting production and continuous casting production and is suitable for refining of solidification structures of various metal materials.

Description

technical field [0001] The invention relates to a composite pulse magnetic oscillation method for refining metal solidification structure, which belongs to the technical field of metallurgy and metal material preparation. Background technique [0002] With the development of modern science and technology, the requirements for the performance of metal materials are getting higher and higher. The control of the solidification structure of metal materials is an important means to improve the performance of materials. Therefore, the research on controlling the solidification process of metals has become the attention of domestic and foreign material scientists. Hotspots, especially the solidification and refinement technology of materials have been regarded as one of the main means to improve the performance of materials in recent years. The traditional methods for refining metal solidification structure mainly include process method, chemical method and external field method. ...

Claims

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Application Information

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IPC IPC(8): B22D27/02
Inventor 翟启杰徐智帅孙俊杰刘圣李祺欣张志臣梁柱元龚永勇李仁兴
Owner SHANGHAI UNIV
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