Oil lubricating electromagnetic vertical type semi-continuous casting method and crystallizer of magnesium alloy ingot blank

Abstract

An oily electro-magnetism vertical type semi-continuous casting process for a magnesium alloy ingot blank and a crystallizer are disclosed. The crystallizer comprises a metal liner, a cooling system, an excitation winding, a splash ring and a cover gas ring. The metal liner is disposed at the center of crystallizer. A cavity cooling system is disposed out of the metal liner. The excitation winding is disposed at the lower part in the cooling water cavity. A splash ring is disposed at the upper edge of the crystallizer liner. A cover gas ring is disposed above the splash ring. The invented method comprises following steps: coating a thin layer of lubricant oil on the inner wall of the metal liner, starting the crystallizer cooling system; then starting the low frequency generation power source to supply low frequency alternating current to the excitation winding; inducing the magnesium alloy fluid into the shunting disk disposed in the center of the liner; opening the cover gas ring; starting the casting machine and adjusting the crystallizer liquid level to be stable after the magnesium alloy fluid fills the top of the dummy ingot head; enlarging the cooling water flow, opening and adjusting control valve for controlling the splash ring. The invented proves can improve the surface quality of the magnesium alloy ingot blank, reduce surface turning quantity thereof, and increase casting speed thereof.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and in particular relates to a vertical semi-continuous casting method which adopts an oil-lubricated all-metal inner sleeve crystallizer system in a low-frequency electromagnetic semi-continuous vertical casting process to realize the production of magnesium alloy ingots with high surface quality and equipment. Background technique [0002] In the traditional semi-continuous casting process, due to the large radial positive pressure between the molten metal and the metal initial solidified shell and the metal inner sleeve at high temperature, there is a large interface friction resistance, and due to the gap between the molten metal and the inner sleeve wall For magnesium alloys, the degree of adhesion is more serious, and even prone to reactive adhesion, which aggravates the scratches on the surface of the ingot, and these scratches are generally radially deep into the interior of t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current surface quality of magnesium alloy ingots is not satisfactory, resulting in large amount of surface turning, low yield and ot

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