Slow cooling device for reducing bottom warp of aluminum alloy ingot

Abstract

The invention relates to a slow cooling device for reducing the bottom warp of an aluminum alloy ingot, which comprises a dummy bar head and a heat insulation film; the outline of the heat insulation film is consistent with the shape of the bottom surface of the dummy bar head, and is in a hyperboloid; the middle part of the heat insulation film is a cavity, and the shape of the cavity is in an 'opening' shape; the structure of the heat insulation film is gradually thickened from inside to outside, is provided with taper along four directions, and the angle between the upper surface and the lower surface of the film is 4 to 10 degrees; and the heat insulation film is paved in the center of the bottom surface of the dummy bar head, and the ratio of the bottom surface area of the cavity of the heat insulation film, the area of the bottom of the heat insulation film and the bottom surface area of the dummy bar head is (1 to 2): (4 to 6): (8 to 15). The heat transfer performance of the heat insulation film is weaker, and the use in hard alloy semi-continuous casting, the temperature difference between the ingot center and the surface metal in the early period of casting can be significantly reduced, the stress concentration caused by that the cooling strength of the bottom of the ingot is excessively concentrated on the outer surface is effectively mitigated, so that the bottom warp tendency is significantly reduced; and the device has simple structure, and is very practical.

Description

technical field [0001] The invention relates to a slow cooling device for reducing the warping of the bottom of an ingot in the initial stage of aluminum alloy semi-continuous casting, and belongs to the technical field of aluminum alloy semi-continuous casting. Background technique [0002] Aluminum alloy slabs are mainly used to roll various aluminum sheet, strip and foil products. With the rapid sales of products, aluminum processing enterprises have begun to mass-produce aluminum alloy slabs. Among the thousands of tons of aluminum alloy slabs that have been produced, many waste products are related to defects such as bottom warping and cold cracking, accounting for a very high proportion of waste products. Bottom warpage is mainly caused by the rapid cooling of the bottom of the ingot after it sees water, and the cooling rate increases sharply; at this time, the normal liquid pocket has not yet formed, and the shrinkage of the surface metal is hindered by the inner meta...

AI Technical Summary

Problems solved by technology

For the casting of large-scale hard aluminum alloy slabs, due to the high content of alloying elements in the ingot, the number of eutectic phases with low melting points at the grain boundary is large, and the plastic zone of the ingot is small and the brittle zone is large during the solidification process. , the ingot has low resistance to bottom warping at the start of casting

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