Differential phase pulse magnetic field electromagnetic continuous casting method

A pulsed magnetic field and phase technology, applied in the field of metal material processing, can solve the problems of limited electromagnetic range and effect, non-adjustable electromagnetic in the height direction, low electromagnetic utilization rate, etc., to achieve enhanced disturbance and stirring effect, enhanced stirring effect, mechanical Effect of improving performance and yield

Active Publication Date: 2018-08-31
NORTHEASTERN UNIV
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Problems solved by technology

[0007] Aiming at the problems in the existing horizontal continuous casting, vertical continuous casting and semi-continuous casting processes when the electromagnetic field is applied, the height direction of the electromagnetic field cannot be adjusted, the range and effect of the electromagnetic action are limited, the utilization rate of the electromagnetic field is low, and other problems, the present invention provides a phase difference pulse The

Method used

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  • Differential phase pulse magnetic field electromagnetic continuous casting method
  • Differential phase pulse magnetic field electromagnetic continuous casting method
  • Differential phase pulse magnetic field electromagnetic continuous casting method

Examples

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Example Embodiment

[0040] Example 1

[0041] The principle of the difference phase pulse power supply system in the difference phase pulse magnetic field electromagnetic continuous casting method is as follows figure 1 As shown, the phase pulse power system will input three-phase AC power through the transformer to output DC voltage, and then through the rectifier and filter of the thyristor controller, thyristor components and electrolytic capacitor, through the IGBT trigger unit, and then through the infinite capacitor and load coil Parallel components form an LC oscillating circuit, and two sets of square wave pulse voltages and sawtooth pulse currents with a phase angle difference of 90 degrees are output by the adjustment of the PLC controller;

[0042] The typical voltage and current waveforms generated by the differential phase pulse electromagnetic system are as follows figure 2 As shown, two sets of typical pulse signals produced by the differential pulse power system, figure 2 (a) shows a ...

Example Embodiment

[0049] Example 2

[0050] For horizontal continuous casting, the principle of the differential phase pulse power supply system in the differential phase pulse magnetic field electromagnetic continuous casting method is the same as that of the first embodiment;

[0051] The device structure of the working mode of the phase difference pulse magnetic field electromagnetic continuous casting method is as follows Figure 5 As shown in (b), the molten metal enters the inner sleeve 20 (casting cavity) of the mold through the tundish 22. In order to prevent the molten metal from cooling too fast during the sub-contracting process, a heating coil 23 is set outside the runner 26, and at the same time Applying a magnetic field to make the temperature distribution more uniform, to ensure that the molten metal is kept at a proper temperature before entering the inner sleeve 20 of the mold, to ensure that the Lorentz force can fully act on the molten metal 8, and the molten metal 8 is cooled by ...

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Abstract

The invention provides a differential phase pulse magnetic field electromagnetic continuous casting method. In a horizontal continuous casting process, a vertical continuous casting process or a semi-continuous casting process, 2n excitation coils are arranged in the crystallizer in the axial direction of a cast ingot; each excitation coil is divided into two groups, a differential phase pulse magnetic field power supply system is adopted, two groups of component wave pulse voltages and sawtooth-shaped pulse currents are output to act on the two sets of excitation coils correspondingly, and act on a paste region of molten metal and metal, the generated phase angle difference phi of the two groups of electromagnetic pulse signals is 90 degrees, and a differential phase traveling wave magnetic field is formed in the pasty region of the metal melt and the metal. The method can be applied to preparation of ingots with different shapes and geometrical sizes; the alloy element segregation ofproduced products is greatly reduced; the grain size is greatly reduced; and the mechanical property and the rate of finished products are remarkably improved.

Description

technical field [0001] The invention belongs to the field of metal material processing, in particular to an electromagnetic continuous casting method with a phase difference pulse magnetic field. technical background [0002] As the main preparation method of metal and alloy ingots, vertical and horizontal continuous casting technology has the advantages of high production efficiency, low casting cost, and simple operation; Cooling is faster than the internal metal liquid and solidifies first, and the core of the slab is prone to loose structure; in addition, for large-sized slabs with large width and thickness, the temperature difference between the inside and outside is large during solidification, which is likely to cause coarse grains in the core of the ingot, and severe The macroscopic and microscopic segregation of the ingot is prone to defects such as cracks, which greatly reduces the mechanical properties and deformation capacity of the material; The solidification ...

Claims

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Application Information

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IPC IPC(8): B22D11/115
Inventor 乐启炽贾永辉陈星瑞程春龙宝磊赵大志
Owner NORTHEASTERN UNIV
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