Method and device for low overheat composite casting aluminum alloy under action of steady magnetic field

Abstract

The invention relates to a method and a device for low overheat composite casting aluminum alloy under the action of a steady magnetic field. The device comprises a crystallizer, a magnetic coil, an external layer alloy melt distributor, a cooling jacket, a heat exchanger plate, a small molten pool and a big molten pool. The method comprises the following processing steps: melting alloy, refiningalloy, degassing and removing impurities of alloy melt after refining, then stewing melt respectively for 30-60min, starting up a static magnetic field with the magnetic strength of 30-40 mT, starting high temperature melt casting at the casting temperature of 15-30 DEG C higher than the molting point of the alloy; starting casting of low temperature melt at the casting temperature of 80-100 DEG C higher than the alloy when the liquid surface of high temperature melt reaches to the position of 40-50 mm above the lower edge of the heat exchanger plate; and starting up a casting machine and starting regular semi-continuous casting. The invention ensures the formation of a stable straight composite interface of metallurgical bonding, and is easily realized in technology.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to the composite casting technology of aluminum alloy. Background technique [0002] The application of aluminum alloys in various industries and fields is becoming more and more extensive, and the requirements for the variety and quality of aluminum alloys and their products are also getting higher and higher. Double-layer or multi-layer composite aluminum alloy composite materials, especially plates and strips It has been widely used in many fields. However, the current production of aluminum alloy composite strips is mainly prepared by solid-solid composite rolling. Since this preparation method is to combine two or more aluminum alloy slabs at high temperature and create more new surfaces through a large reduction rate, there are often defects such as oxides and pores at the composite interface, and the bonding strength is not good. high. The final ...

AI Technical Summary

Problems solved by technology

The process of this method is complicated, and it is not easy for industrial application, especially because the core metal has been solidified into a solid state and the solidified shell is easily oxidized in the air, thus affecting the bonding state of the composite interface

In the core-filling continuous casting method, since the core melt enters the crystallizer through a diversion tube, there is no cooling process before, and it is very easy to cause the mixing of the melt, resulting in composite failure

Images