Method for continuous casting and device for carrying out the method
A technology of continuous casting and semi-continuous casting, which is applied in the field of continuous casting and the device implementing it, and can solve problems such as interfering with the casting process and damaging the quality of casting products
Inactive Publication Date: 2005-02-02
ABB (SCHWEIZ) AG
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Problems solved by technology
This solidification will seriously disturb the casting process and spoil the quality of the cast product in many ways
Method used
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[0049] shown in figure 1 The apparatus for the continuous casting of metals in the present invention comprises a continuous casting mold 22 which is open at both ends in the casting direction and provided with cooling means, preferably comprising a cooling agent in it during operation. A system of fluid cavities or tanks, and means to ensure that the formed strand 20 leaves the mold continuously. A primary stream of hot melt is continuously supplied to the cooled mold 20 in which the hot metal 21 is cooled and the strand 20 is formed. Crystallizer 22 is typically a water-cooled copper crystallizer. The mold 22 and all supporting beams comprise cavities or tanks, not shown, in which water flows during the casting process. A primary stream of hot melt is supplied to the crystallizer 22 during casting. As it passes through the crystallizer 22, the metal is cooled and solidified, thereby forming the strand 20. When the strand 20 leaves the mold 22, it comprises a solidified, s...
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A method and a device for continuous or semi-continuous casting of metal, where hot melt is supplied to a cooled continuous casting mold and the melt is cooled and formed to a at least partly solidified strand as it passes through the mold. An inductive coil is arranged at the top end of the mold to, when supplied with an alternating electric high frequency current, generate a high frequency magnetic field to act upon the melt in the mold, whereby heat is developed in the melt and compressive forces acting to separate the melt from the mold wall are generated. The coil is supplied with the high frequency current from a power supply unit with current control means to supply an alternating electric high frequency current having a base frequency of 50 Hz or more to the inductive coil. The current control means comprises modulation means for modulating and controlling the supplied current is controlled in a pulsed, amplitude modulated manner with an amplitude modulated modulation frequency of 10 Hz or less, whereby essentially full amplitude of the amplitude modulated current is achieved within a rise time corresponding to 1 cycle of the base frequency or less at the start of a pulse.
Description
technical field [0001] The invention relates to a method for continuous or semi-continuous casting of metal or alloys into long strands. The strand is cast using a device comprising a cooled continuous casting mold and an induction coil arranged at the top of the mold. The coil is supplied with high frequency alternating current from a power supply. The method of the present invention ensures that the temperature and other casting conditions that determine the initial solidification conditions in the crystallizer are controlled, so that the cast product, the slab, exhibits improved surface properties, controlled as-cast structure, and low levels of inclusion infiltration and other defects. characteristics, and can be produced at a sustained high productivity. The invention also relates to a device comprising a continuous casting mold suitable for the method according to the invention, a coil, a power supply unit with a control device. Background technique [0002] In cont...
Claims
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IPC IPC(8): B22D11/11B22D11/04B22D11/051B22D11/07B22D11/115
CPCB22D11/115B22D11/10
Inventor A·莱曼E·斯文森J·-E·艾利克森D·K·格林
Owner ABB (SCHWEIZ) AG