Method and apparatus for preparing semisolid slurry for automobile aluminium wheel through compound modification refinement and electromagnetic stirring

Abstract

A method and an apparatus for preparing a semisolid slurry for an automobile aluminium wheel through compound modification refinement and electromagnetic stirring. The method comprises steps of: transferring alloy with degree of superheat of 100-120 DEG C into a transit bag, adding a refinement modification agent with high purity nitrogen by an injecting device, wherein the refiner is Al-Zr-B-O intermediate alloy with a granularity of 150-200 um, and the alterant is Al-Sr-RE complex alloy with a granularity of 200-2505 um; standing for 5-8 min, pouring into an electromagnetic stirring crucible when a temperature is 40-50 DEG above a liquidus, putting the crucible in an electromagnetic stirrer, and carrying out composite stirring through a crucible peripheral stirrer and central stirrer, wherein the peripheral stirrer has a frequency of 10-20 Hz, a power of 12 kw, a rate of 300-500 rmp and a time of 2-3 min, and the central stirrer has a frequency of 5-15 Hz, a power of 1-2 kw, a rate of 300-800 rmp and a time of 2-3 min; stopping stirring, when a melt temperature drops to 10-15 DEG C below the liquidus, to obtain a near sphaerocrystal structure semisolid aluminium alloy slurry. The method solves problems of nonuniform slurry and low pulping efficiency.

Description

technical field [0001] The invention relates to the technical field of semi-solid materials, in particular to a method and a device for preparing semi-solid slurry for automobile aluminum wheels through compound modification and refinement and electromagnetic stirring. Background technique [0002] Semi-solid refers to a two-phase state in which both a spherical solid phase and a fluid liquid phase exist in the alloy. Semi-solid forming technology is a new method of metal forming first proposed by Professor M.C.Flemings and Dr. D.B.Spencer of the Massachusetts Institute of Technology in the early 1970s. It is a metal or alloy in the temperature range between solidus and liquidus When it is subjected to vigorous stirring, the dendritic primary solid phase is fully broken, and a solid-liquid mixed slurry with a certain spherical primary solid phase uniformly suspended is obtained, and then processed. Compared with ordinary die-casting process, the use of semi-solid forming pr...

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Problems solved by technology

[0005] This method starts with promoting grain nucleation and improving pulping efficiency, and adopts the technology of "melt composite refining modification + composite electromagnetic stirring" to solve the problems of quality and efficiency in the past semi-solid slurry preparation process. The specific process is as follows: :

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