Preparation method and device of cast ingot for high-toughness and high-corrosion-resistance aluminum alloy thick plate

Abstract

The invention discloses a preparation method of a cast ingot for a high-toughness and high-corrosion-resistance aluminum alloy thick plate, which comprises the following steps that during casting, an aluminum alloy melt enters a casting mold from a runner, cooling water is stored in the casting mold, and during casting, the cooling water in the casting mold cools the casting mold and is sprayed to a cast ingot solid-state area of the cast ingot; a liquid hole interface exists between an aluminum alloy melt and a solid area of a cast ingot, an ultrasonic probe set is used for at least covering the deepest part to the 1/2 depth part of the liquid hole, the ultrasonic probe set is coupled with the surface of the cast ingot through a water film formed by cooling water, and an ultrasonic signal is transmitted to an ultrasonic detector; accurate, rapid, safe and low-cost measurement of the shape of the casting liquid cavity is realized, and the shape of the liquid cavity is obtained. The casting process is optimized in real time by observing the liquid hole shape measured by the ultrasonic detector and correspondingly adjusting casting process parameters, the ideal liquid hole shape is obtained, an ideal casting structure is obtained, and finally the cast ingot for the high-toughness and high-corrosion-resistance aluminum alloy thick plate is obtained.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a method for measuring the shape of an aluminum alloy semi-continuous casting liquid cavity based on ultrasonic detection technology, and adjusting the preparation process parameters in real time according to the measurement results to obtain high-quality aluminum alloy ingots and related methods. equipment. Background technique [0002] As we all know, the strength of pure aluminum itself is not high, and its performance can be greatly improved by adding alloying main elements, microalloying elements and removing impurity elements to form aluminum alloys in the aluminum matrix. With the development of technology and economy, the aerospace industry has higher and higher requirements for aluminum alloy structural materials. It not only requires aluminum alloys to have higher strength, but also has comprehensive properties such as high toughness and high corrosion re...

AI Technical Summary

Problems solved by technology

However, this method of indirectly measuring the shape of the liquid cavity has the problem of measurement accuracy, and the thermocouple itself inserted into the liquid cavity will form a non-uniform nucleation interface of the coarse metal compound, resulting in the preferential nucleation of the coarse metal compound on the surface of the thermocouple. , when the coarse metal compound accumulates to a certain amount, it will fall off, affecting the quality of the ingot

[0007] Neither of the above two methods is a non-destructive testing method, and there are deficiencies in both measurement accuracy and product quality impact

In the aluminum processing industry, it is well known that the shape of the liquid cavity can be changed by adjusting the casting process parameters "cooling water flow rate, casting speed and grain refiner input". The effective means of detecting the shape of the liquid cavity in the process can only use the method of industrial trial and error to find the best matching process parameters of cooling water flow, casting speed and grain refiner input, which wastes a lot of manpower, material resources and financial resources

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