A magnesium alloy low-frequency pulsed magnetic field assisted semi-continuous casting mold and its application

Abstract

The invention belongs to the field of the preparation of metal materials, and particularly relates to an auxiliary semi-continuous casting crystallizer for a low-frequency pulsed magnetic field of magnesium alloy and application thereof. The top of a casing of the crystallizer is provided with an upper cover of the crystallizer, the casing of the crystallizer and the position of a center hole of the upper cover of the crystallizer are provided with an inner sleeve of the crystallizer, a cooling water tank is formed between the casing of the crystallizer and the upper cover of the crystallizer, an excitation coil is arranged in the cooling water tank, the outer side of the casing of the crystallizer is provided with a water inlet communicated with the cooling water tank, and a secondary cooling water spraying hole communicated with the cooling water tank is arranged on the inner sleeve of the crystallizer. The casing and the upper cover of the crystallizer are made of stainless steel, and the inner sleeve of the crystallizer is made of a 4XXX family of aluminum alloy; and moreover, an upper opening of the inner sleeve of the crystallizer is higher than the upper surface of the upper cover, and a horn shape is formed between the upper opening and a lower opening. The auxiliary semi-continuous casting crystallizer for the low-frequency pulsed magnetic field of the magnesium alloyis used for the semi-continuous casting of the magnesium alloy, the forced convection of a melt is generated by utilizing pulsed electromagnetic force generated by the auxiliary semi-continuous casting crystallizer for the low-frequency pulsed magnetic field of the magnesium alloy to act on the melt of the magnesium alloy inside the crystallizer, bulky dendritic crystals are fragmented, the nucleation rate is increased, and the thinning effect of the crystal grains of a semi-continuous cast rod of the magnesium alloy is obvious.

Description

Technical field [0001] The invention belongs to the field of metal material preparation, in particular to a magnesium alloy low-frequency pulsed magnetic field assisted semi-continuous casting crystallizer and its application. Background technique [0002] Vertical semi-continuous DC casting is currently the main way for the industry to prepare large-scale ingots of metal materials. The metal liquid in the furnace enters the crystallizer through the launder, and the liquid metal melt contacts the dummy head at the bottom and the inner wall of the crystallizer. Under the primary cooling action of the dummy head and the cooling water in the crystallizer, a solidified shell is formed. Shrinkage, the metal gradually separates from the inner wall of the crystallizer, forming a gap. As the dummy head moves down at a certain speed, and contacts the cooling water in the crystallizer, under the secondary cooling of the cooling water, the entire ingot gradually solidification. [00...

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Problems solved by technology

[0003] Magnesium alloy semi-continuous DC casting technology is developed on the basis of the existing aluminum alloy semi-continuous casting technology. This method has high production efficiency, low casting cost, simple operation, and less casting defects in magnesium alloy ingots, dense structure, However, the grain size inside the ingot, especially in the central area of ​​the ingot, has been relatively large and the structure is uneven, which seriously affects the mechanical properties and deformation properties of the ingot.

[0004] In order to solve the problem of relatively coarse grain size and uneven solidification structure of ingots, a new type of semi-continuous DC casting method has been developed at home and abroad, among which electromagnetic casting technology has the most obvious effect. This technology is semi-continuous casting under the action of alternating electromagnetic field Continuous DC casting not only solves the problem of surface quality of semi-continuous ingot, but also can refine the structure of the edge of the ingot, but the effect of refining the structure of the core of the ingot is not obvious

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