High voltage puls supply unit with fining metal solidification component
A technology for high-voltage pulse power supply and metal solidification, which is applied in the field of high-voltage pulse power supply devices, and can solve the problems such as the inability to meet the requirements of the parameter range, the narrow variation range of pulse frequency and pulse width, and the insignificant effect of refinement.
Active Publication Date: 2008-02-13
SHANGHAI UNIV
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Problems solved by technology
Although this method is also an environmentally friendly treatment method, there are obvious deficiencies: First, compared with the ordinary solidification method, this method does not significantly change the nucleation rate of crystal nuclei, so the refining effect is not very good Obviously; secondly, the molten metal is turned up and down by strong stirring, which is easy to get involved in air and other oxidized inclusions, which inevitably pollutes the molten metal; furthermore, due to the limitation of the stirring intensity, the temperature field and composition The effect of homogenization is not too ideal
The main problems are that the peak value of pulse current is small, the voltage is low, and the range of pulse frequency and pulse width is narrow, which cannot meet the requirements of parameter range in actual production.
Method used
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Embodiment 1
[0011] The core of this device is composed of three parts: constant current charging system, energy storage system and control system. Referring to Figure 1, the device circuit includes a charging circuit, a high-voltage rectifying circuit, a shutdown automatic discharge circuit, a high-voltage control circuit, a freewheeling circuit, a main power switch control circuit, a working voltage preselection control circuit, and an ignition tube trigger circuit. The charging circuit is designed There are three-phase constant current oscillating coils T6, T7, T8, connected with step-up transformers T1, T2, T3, through the three-phase constant current oscillating coils T6, T7, T8, the step-up transformers T1, T2, T3 are in constant current Charging working state; the high-voltage rectification circuit is equipped with high-voltage silicon stacks V1-V6 to form a three-phase rectification circuit, and through the rectification circuit, the parallel pulse capacitor bank C1-C10 is charged w...
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The invention relates to thinning metal solidifying structure high pressure pulse power supply unit. It belongs to metal crystalline phase processing pulse power supply unit electric equipment field. Its main core is made up of constant current charge system, accumulation system, and control system. Its main core circuit includes charging circuit, high voltage rectifying circuit, closedown automation bleed-off circuit, high voltage control circuit, follow current circuit, main power switch control circuit, working voltage pre-select control circuit, and ignitron trigger circuit. Its main parameter is as follows: impulse voltage U=100-10000V; C=200-2000uF; f=1-25 Hz; the practicality maximum energy storage is 81 kJ; the maximum discharge current is 2*105 A; the continuous discharge maximum frequency is less than 5Hz; and current impulse width is 10us-100ms. It has the advantages of high impulse voltage, big impulse width range, and high output energy. And it can effectively process solidifying structure thinning for non-ferrous metal and ferrous metal.
Description
technical field [0001] The invention relates to a high-voltage pulse power supply device for refining metal solidification structure, which belongs to the field of pulse power supply device electrical equipment for metal crystal phase structure control and processing. Background technique [0002] The control of metal solidification structure is an important content in the study of metal solidification process. The solidification structure obtained by continuous casting, continuous casting and rolling, and ordinary casting methods is often composed of coarse columnar crystals or dendrites, and the equiaxed crystal zone is very small, resulting in low comprehensive properties of the material. How to obtain an equiaxed grain structure with fine grains or a dendrite structure with small primary and secondary dendrite spacing is one of the important goals of metal solidification structure control. The traditional method of refining the solidification structure is to modify the ...
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IPC IPC(8): C22F3/02B22D27/02H02M9/02H02M9/04
Inventor 翟启杰李仁兴廖希亮龚永勇富知愚
Owner SHANGHAI UNIV