Continuous casting method for producing aluminium alloy semisolid casting ingot

Abstract

The invention belongs to the technical field of metal semisolid processing and relates to a continuous casting method for producing an aluminium alloy semisolid casting ingot. The continuous casting method is characterized by comprising the following steps: firstly, a flow splitting disc, a flow guiding pipe and a stirring rod of a mechanical stirrer positioned at the central part of the flow guiding pipe are preheated at the temperature of 50-80 DEG C; then overheat aluminium liquid with qualified smelting is casted into the flow splitting disc continuously at the temperature of 100-200 DEG C higher than the temperature of a liquid phase line; when the level of the aluminium liquid in the flow splitting disc reaches the range from 50 to150mm, a dummy ingot base starts to act, the continuous casting process is started, and the level of aluminium liquid in the flow splitting disc needs to be maintained in the range from 50 to 150mm; and finally, while the process of continuous casting is started, simultaneously an electromagnetic stirrer positioned at the outer part of the flow guiding pipe and the mechanical stirrer positioned at the central part of the flow guiding pipe are started and aluminium liquid flowing through the flow guiding pipe is stirred. The continuous casting method has the advantages that the aluminium alloy semisolid casting ingot can be produced in a low-cost and large-batch manner, and the continuous casting method is especially suitable for batch production of large-diameter aluminium alloy semisolid casting ingots.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid processing, and in particular relates to a continuous casting casting method for producing aluminum alloy semi-solid ingots. Background technique [0002] Compared with the traditional solid state processing technology and liquid state processing technology, metal semi-solid processing technology has its unique advantages, so it has attracted the attention of many researchers in the past 40 years since it was proposed. Metal semi-solid processing technology can be divided into thixotropic processing and rheological processing according to the process route. At present, thixotropic processing has been widely used in industry due to its high process stability. Thixotropic processing can be roughly divided into three stages, namely the production of semi-solid ingots, secondary heating of semi-solid ingots to semi-solid temperatures, and final shaping. [0003] The production of semi-solid ...

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Problems solved by technology

[0004] At present, the technology of producing semi-solid ingots by electromagnetic stirring method has several patents at home and abroad, but they all have the following shortcomings: 1) The outer diameter of the electromagnetic stirrer is relatively large, so within the same space, batches can be continuously processed at the same time The number of semi-solid ingots produced by casting is very small, which seriously restricts the improvement of production efficiency. This deficiency is particularly prominent when producing semi-solid ingots with larger diameters (>100mm); 2) Due to the skin effect of the electromagnetic field , and the magnetic flux leakage between the electromagnetic stirrer and the stirred aluminum liquid is serious, so it is often difficult to fully stir the center of the stirred aluminum liquid, which affects the quality of the semi-solid ingot; 3) In order to improve the stirring effect, the temperature of the stirred aluminum liquid needs to be Get more precise control in the range of tens of degrees above the liquidus temperature, so as to get the most effective stirring in a very narrow stirring area, which leads to an increase in the difficulty of process control and instability in the quality of semi-solid ingots improve

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