Method and device for preparing semi-solid metal slurry by alternating magnetic field intensifying, overflowing and cooling

Abstract

The invention relates to a method and a device for preparing semi-solid metal slurry by alternating magnetic field intensifying, overflowing and cooling. An alternating magnetic field is arranged around a tipping tube, wherein the alternating magnetic field is provided by an alternating electric field passing through coils of a certain turns. When a metal melt flows through the tipping tube arranged in the alternating magnetic field, the metal melt moves from side to side in a direction perpendicular to the flow direction of the melt under the electromagnetic force action of the alternating magnetic field, and meanwhile, eddy currents in the melt, generated by the alternating magnetic field, thoroughly mix the internal melt, thereby improving the distribution uniformity of solute concentration fields and temperature fields, and lowering the selective growth degree of the primary phase. By controlling the casting temperature, the tipping angle of the tipping tube, the holding temperature of the tipping tube, the electromagnetic agitation intensity and the holding temperature of the crystallizer (or collecting crucible), the invention realizes the preparation and the formation of the semi-solid slurry of non-ferrous alloy such as aluminum alloy, magnesium alloy, zinc alloy and the like, and iron alloy, of which the solid phase fraction varies from 0.1 to 0.9.

Description

technical field [0001] The invention relates to the technical field of semi-solid (near-net) forming of metal materials, in particular to a method and a device for preparing metal semi-solid slurry through alternating magnetic field enhanced overcurrent cooling. Background technique [0002] Semi-Solid Metal forming (SSM for short) is a new solidification structure control technology that can obtain a semi-solid structure with fine and uniformly distributed spherical / near-spherical grains. Since the birth of this technology, scholars at home and abroad have proposed many methods for preparing semi-solid slurry. [0003] The slope / inclined tube method is a new type of pulping process recently developed from Japan. This process is to promote the nucleation and growth of the alloy melt when it flows through a cooling slope due to the chilling of the cooling slope and the nucleation substrate. During the rolling and turning process of the body on the slope, a strong stirring ef...

AI Technical Summary

Problems solved by technology

However, due to the need to add a set of mechanical devices due to mechanical vibration and mechanical rotation, the design of the equipment is complicated, the complexity of the operation is increased, and the stability is reduced.

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