Method and device for electromagnetic continuous casting of bimetallic multilayer round billet

Abstract

The invention relates to a method and a device for electromagnetic continuous casting of bimetallic multilayer round billets. The method comprises the following steps: sending a dummy ingot device into an outer crystallizer to tightly contact with the bottom end of an inner crystallizer, pouring outer layer molten metal to an annular space formed by the inner crystallizer and the outer crystallizer, the outer layer molten metal being cooled by the outer crystallizer, and forming a semi-solid support layer after contacting with the outer circular side wall of the inner crystallizer, the outer circular side wall being bare outside, the dummy ingot device beginning to move downward, casting inner layer molten metal to the inner crystallizer, the inner layer molten metal being cooled by the inner crystallizer and contacting and combining with the semi-solid support layer of the outer layer molten metal to form a compound interface, when a continuous casting process enters a stabilizing stage, switching on a pulse power supply and an intermediate frequency power generator, a pulse field coil applying a pulse electromagnetic field in the inner crystallizer, and an intermediate frequency field coil applying an intermediate frequency electromagnetic field in the outer crystallizer. The method is simple in process technology, an inner layer metal solidification structure and an outer layer metal solidification structure of a manufactured product are refined, surface quality of the outer layer metal is high, and the compound interface is clear and stable.

Description

technical field [0001] The invention relates to the field of solidification processing of metal materials, in particular to a method and equipment for electromagnetic continuous casting of a double-metal clad round billet. Background technique [0002] Bimetal clad material is a new type of composite material that combines two alloys with different physical, chemical and mechanical properties at the interface. This type of material can meet the special requirements for materials in different environments by making use of their strengths and offsetting their weaknesses. The methods for preparing cladding materials mainly include rolling cladding method, explosive welding method, extrusion method, etc. In recent years, the technology of preparing bimetallic cladding materials by continuous casting method has attracted extensive attention of researchers. [0003] The patent application with the publication number US3421569 proposes to use two coaxial graphite crystallizers to f...

AI Technical Summary

Problems solved by technology

The electromagnetic field used in this patent is a direct current constant magnetic field, and its function is to avoid mixing and melting of two kinds of molten metals. CN1413782 and CN101549392 also disclose an electromagnetic continuous casting method for clad materials. The purpose of using the electromagnetic field is consistent with that of WO92 / 18271. Both are to avoid mixed flow of the inner and outer metal melts, but neither improves the solidification structure of the multi-layer cast slab

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