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

A semi-solid slurry and alternating magnetic field technology, applied in the field of semi-solid forming of metal materials, can solve the problems of increased operation complexity, complicated equipment design, reduced stability, etc., to achieve sufficient heat flow transfer, shorten pulping time, The effect of suppressing dendrites

Inactive Publication Date: 2010-08-18
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, due to the need to add a set of mechanical devices due to mechanical vibration and mechanical rotation, the

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

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Embodiment Construction

[0011] The alloy melt with a lower degree of superheat of 5-20°C in the holding furnace 1 is poured into the inclined tube 2, the preheating temperature of the inclined tube is 80-450°C, and its temperature is adjusted by the heating device 3 and the cooling device 4, Measured by thermocouple 7. An electromagnetic induction coil 5 is arranged outside the inclined tube to electromagnetically stir the overcurrent melt (an induced current is generated inside the melt to form an induced magnetic field, and the interaction between the two magnetic fields causes strong stirring inside the melt). The alloy melt flows through the inclined tube under the combined action of its own gravity and electromagnetic force, resulting in strong shear and chilling, which promotes the rapid nucleation and growth of the pro-eutectic phase and is crushed and refined to obtain high-quality metal semi-solid slurry . The slurry enters the crystallizer 6 for heat preservation, cooling and solidificatio...

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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...

Claims

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Application Information

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IPC IPC(8): B22D1/00B22D17/20B22D11/08B22D18/02
Inventor 周荣锋张玲蒋业华周荣王铁旦吉建立杨贵琴
Owner KUNMING UNIV OF SCI & TECH
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