Pulse magneto liquid level vibration method for thinning metal solidification texture

A technology of metal solidification and pulse magnetism, which is applied in the field of material processing, can solve the problems of limited effective range of action, impact on production safety, splashing, etc., and achieve the effect of avoiding chilling effect or pollution, improving production efficiency, and simple disassembly and debugging process

Active Publication Date: 2010-12-22
SHANGHAI UNIV
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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 not only affects production safety, but also causes strong fluctuations and even splashes on the metal surface when the current is large; Crystallization technology, the selection of heat-resistant tool heads that introduce ultrasonic waves into molten metal is a key technology, and at the same ti

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  • Pulse magneto liquid level vibration method for thinning metal solidification texture
  • Pulse magneto liquid level vibration method for thinning metal solidification texture
  • Pulse magneto liquid level vibration method for thinning metal solidification texture

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Embodiment 1

[0023] The material of this embodiment is industrial pure aluminum with a purity of 99.7wt%. The casting molds are water glass sand dry type and graphite type. The number of turns is 1 and the number of layers is 12. Pulsed magneto-induced liquid level oscillations are performed during the nucleation stage. To enhance contrast, figure 2 It is the macrostructure of pure aluminum that has not been treated with pulsed magnetic liquid surface oscillation when the casting mold is a sand mold. image 3 It is the macrostructure of pure aluminum subjected to pulsed magnetic liquid surface oscillation treatment in the nucleation stage when the casting mold is a sand mold (the peak value of the pulsed magnetic liquid surface oscillation current is 8h I A, processing frequency 6k I Hz, pulse width 50b I μs). Figure 4 It is the macrostructure of pure aluminum that has not been treated with pulsed magneto-induced liquid level oscillation when the casting mold is graphite type. Fig...

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Abstract

The invention relates to a method for thinning a metal solidification texture, which belongs to the technical field of material processing. A pulse magneto liquid level vibration method achieves a better thinning effect by acting a multi-layer coil on a liquid metal level. The method comprises the following steps of: arranging a non-contact multi-layer oil at a position 0.1 to 20cm above the liquid metal level; and performing pulse magneto liquid level vibration treatment, wherein treatment parameters comprise a pulse current I of 10 to 10,000A, a pulse width of 10mus to 50ms and an acting frequency f of 0.01 to 2 kHz. In the invention, the multi-layer is acted on the upper surface of a metal melt, practical operation is very simple and convenient, and the solidification texture of a cast ingot has an obvious thinning effect. When the method is applied to industry, the action mode can realize non-contact melt processing, and the coil can be conveniently moved to perform bath processing to improve production efficiency; and, shielding effects of a cast molding machine or a crystallizer on a magnetic field can be avoided. The method is suitable for die casting, semi-continuous casting and continuous casting production in the metallurgic industry and suitable for thinning the texture of various metal materials.

Description

technical field [0001] The invention relates to a method for refining metal solidification structure by pulse magnetic liquid surface oscillation, which belongs to the technical field of material processing. Background technique [0002] Metal materials play a pivotal role in a country's national economy. With the development of modern science and technology, the requirements for the performance of metal materials are getting higher and higher. The key to obtaining high-performance and high-quality metal materials is to control the solidification process of metals. . The research on controlling the solidification process of metals has always been a focus of material scholars, especially the research on the refinement of metal solidification structure has become an important means to improve the properties of metal materials. The traditional methods for refining metal solidification structure mainly include (1) pouring process and heat transfer condition control method; (2) ...

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Application Information

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IPC IPC(8): B22D27/02
Inventor 龚永勇翟启杰李博李仁兴尹振兴
Owner SHANGHAI UNIV
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