Semi-continuous casting device and method for inhibiting composition segregation of aluminum alloy ingot

Abstract

The invention aims at providing a semi-continuous casting device and method for inhibiting composition segregation of an aluminum alloy ingot to overcome the defects of equipment and methods for reducing composition segregation of ingots, especially large-size ingots in the prior art and belongs to the technical field of aluminum alloy casting equipment. The device comprises a pressing plate, a heat insulation nut, a flow guiding partition plate, a graphite ring, a crystallizer, a wire and a dummy ingot head. The heat insulation nut is located on the upper portion of the crystallizer and is fixed to the crystallizer through the pressing plate. The flow guiding partition plate is located in the heat insulation nut. The partition plate is provided with an open hole. The graphite ring is embedded in the inner wall of the crystallizer. The coil is located in the crystallizer. A cooling water hole is formed in the lower portion of the inner wall of the crystallizer. The dummy ingot head is located on the lower edge of the graphite ring in the crystallizer. The lower end of the dummy ingot head is connected with a casting machine. According to the semi-continuous casting device, the position and the size of the open hole in the flow guiding partition plate are adjusted, and aluminum melt is evenly dispersed into the crystallizer under the stirring action of an electric magnetic field, so that composition segregation of liquid cave depth and the interior of the ingot in the aluminum alloy casting process is effectively reduced.

Description

technical field [0001] The invention belongs to the field of aluminum alloy casting equipment and technology, in particular to a semi-continuous casting device and method for suppressing component segregation of aluminum alloy ingots. Background technique [0002] Pure aluminum is the second largest metal after iron, and is the most typical lightweight material among metal materials, with the advantages of high specific strength, easy processing, and low cost. Adding a certain amount of alloying elements to pure aluminum, forming aluminum alloy after melting and casting, has been widely used in various fields of national economy, such as: aerospace, transportation, electronic communication, light industrial building materials, packaging containers, petrochemical industry , hardware and electrical appliances and many other fields. In the aluminum alloy casting process, the cooling intensity near the edge of the crystallizer is high, while the cooling intensity near the cente...

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Problems solved by technology

[0004] In the actual aluminum alloy semi-continuous casting process, for the specific alloy composition and ingot size specification, the adjustable process parameters (reducing the casting speed and increasing the cooling rate) are very narrow; The content has a certain range, so there are limitations in adjusting process parameters and adding refiners; applying an electromagnetic field can cause strong convection in the melt to make the temperature field uniform, and to a certain extent can reduce the depth of liquid pockets and inhibit component segregation, but When preparing large-sized ingots, due to the skin effect of the electromagnetic field, the magnetic field at the core of the ingot is relatively weak, and the stirring of the high-temperature melt at the center of the ingot is weak, which makes the depth of the liquid cavity shallower and reduces the risk of segregation of the ingot composition. Poor ability

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