Aluminum alloy square ingot casting crystallizer

Abstract

The present invention relates to continuous casting apparatus for metallurgical industry, and provides one kind of square aluminum alloy ingot casting crystallizer for equal-level hot top casting of square aluminum alloy ingot. The casting crystallizer consists of one heat insulating hot top duct, one upper crystallizer muff and one lower crystallizer muff connected successively from top to bottom, and one starter head constituting one liquid cavity together with the other parts. Adopting the casting crystallizer can realize two-step locating of secondary cooling crystallization and dummy ingot before casting and the new technological process of equal-level hot top casting of square aluminum alloy ingot, raise the quality of cast square aluminum alloy ingot and raise production efficiency.

Description

technical field [0001] The invention relates to the field of continuous casting equipment in the metallurgical industry, more specifically, an aluminum alloy square ingot casting crystallizer used in the aluminum alloy square ingot hot top casting process. Background technique [0002] Aluminum alloy rods can be classified into round ingots and square ingots according to the cast shape. At present, the traditional aluminum alloy square ingot casting process mostly adopts the non-level casting method, as shown in Figure 4, the process is to form a crystallization belt by the crystallizer 16, and configure the floating funnel 15 to control the liquid level, combined with the peripheral transmission device, Together they form a casting system for aluminum alloy square ingots. The casting device that completes its main body crystallization in this system is the crystallizer 16, which is usually made of 8--10mm aluminum plate, folded into a square by folding, and the periphery i...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this direct cooling non-level casting process is that the level of the metal liquid level in the mold cannot be well controlled during the casting process. If the liquid level is too low, it will cause a cold gap on the surface of the ingot. Aluminum leakage will occur; if it is too high, it will increase the depth of the deflection on the surface of the ingot, which will easily cause scratches or even cracks on the surface of the ingot

Another disadvantage is: the problem of liquid level drop during casting. When the molten aluminum flows out of the furnace, turbulent flow will occur when it flows through the floating funnel. During this process, the molten aluminum rolls and the high-temperature molten aluminum contacts a large amount of air, causing The secondary inclusion of aluminum oxide film and the increase of hydrogen content greatly reduce the quality of molten aluminum

The aluminum alloy square ingot after casting usually shows: coarse grains, severe cold shut, low homogeneity, unable to reduce oxide and hydrogen inclusion content

The crystallization zone formed by the casting crystallizer in this device is very high, generally between 110---150mm; the part after casting is also prone to deformation, resulting in the scrapping of the workpiece; and because the floating funnel will occupy the ingot The casting liquid level makes it very difficult to cast small square ingots with a width below 120mm

Moreover, when this casting crystallizer is used, the positioning of the dummy device before casting is complicated, and the compatibility of the workpiece is poor, and it is easy for the dummy head 4 to directly hit the mold 16.

[0004] Although the same-level hot-top casting process applied to round ingot casting can overcome the level and drop problems of the liquid level in casting, it cannot be directly applied to the casting of aluminum alloy square ingots, because the shape and process characteristics of square ingots are different from those of round ingots. Different, it is difficult to achieve the same flow equalization effect as a round ingot in the process of casting liquid. When the length of the cross-section of the cast square ingot is greater than the width, the traditional non-level casting method is only to set a vertically uniform liquid in the crystallizer. The boat-shaped floating funnel of the flow, but the floating funnel cannot be placed in the same-level hot-roof casting device, so the current aluminum alloy square ingot casting can only be in the non-level casting process

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