Low-frequency electromagnetic field horizontal continuous casting process and equipment for aluminum alloy and magnesium alloy

Abstract

One kind uses in the aluminum alloy, the magnesium alloy low frequency electromagnetic field level continues the casting craft, contains has the alloy melt body inducts in the middle package and the crystallizer, after the crystallizer in graphite link and cooling water two cooling, tows again by chain drive the system directs the spindle pole to pull out, in the drawing front end the crystallizer coat, between the crystallizer and the middle package, of a disposition exciting coil in middle package front parts, the electromagnetic field frequency which it produces is 18-820Hz, the magnetic field strength is 2000-5000ampere, in the middle package and the crystallizer transition region establishes the loudspeaker bowl, the drawing speed is 150-5000mm / min; Uses this craft the equipment to contain the power and the transmission system, is made by the guide rail directs the spindle pole, middle part and so on package and crystallizer, this craft and the equipment union may produce the energy organization to be thin.Even, the surface quality fine aluminum alloy, the magnesium alloy ingot blank, favor the deep processing.

Description

technical field [0001] The invention relates to a light alloy casting process and equipment, in particular to an aluminum alloy or magnesium alloy low-frequency electromagnetic field horizontal continuous casting process and equipment. Background technique [0002] At present, when producing small-scale, small-batch, multi-variety aluminum alloy or magnesium alloy slabs or round bars, the conventional horizontal casting process has the following disadvantages in practice: [0003] 1) Like hot top casting (vertical casting), due to the temperature gradient between the inside and the edge of the ingot during the solidification process, the microstructure of the ingot is uneven, the center is thick, the edge is relatively small, and the average grain size is large, and the branch Crystal developed; [0004] 2) At the same time, due to gravity in the horizontal casting process, the contact pressure and friction between the lower part of the ingot and the graphite ring in the cr...

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Problems solved by technology

[0005] 3) For alloys with a large density difference of alloying elements, the macrosegregation is exacerbated by the density difference of alloying elements and the asymmetry of liquid pockets during cooling;

[0006] 4) At the same time, because the secondary cooling duration of horizontal continuous casting is shorter than that of vertical casting, for large-size ingots, it may increase the grain size and the difference between the internal and external structures of the ingot, increase internal stress, and promote the occurrence of micro-cracks

In China, only Shanghai Jiaotong University has conducted research on a special horizontal continuous casting machine for magnesium alloys and applied for a patent (CN1317383A), but this patent uses a long primary cooling zone, which makes it difficult to ensure good surface quality of the ingot; There are many difficulties in the implementation of the method of controlling the flow rate of magnesium melt, so there is no domestic enterprise using horizontal casting to produce magnesium alloy ingots

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