In-ladle speed control rotational flow spheroidizing method for nodular cast iron

Abstract

The invention discloses an in-ladle speed control rotational flow spheroidizing method for nodular cast iron. In the spheroidizing step, high-temperature molten iron enters flow channels through outerwall face holes of a shell of a spheroidizing treatment device, flows through diameter expanding sections and equal-diameter sections of the flow channels and enters a cavity from inner wall face holes of the shell, a spheroidizing agent in the cavity is partially gasified when meeting the high-temperature molten iron, when the pressure in the cavity is larger than the pressure outside the cavity, the high-temperature molten iron carrying the spheroidizing agent is extruded into the flow channels through the inner wall face holes of the shell, flows through the equal-diameter sections and thediameter expanding sections of the flow channels and flows back to a ladle from the outer wall face holes of the shell, when the pressure in the ladle is larger than the pressure in the shell again,the high-temperature molten iron enters the flow channels through the outer wall face holes of the shell of the spheroidizing treatment device again, the liquid feeding and discharging processes are repeated until the spheroidizing agent is completely gasified, and the pressure inside and outside the shell is balanced. Through optimization of spheroidizing agent release and molten iron supplementing paths, reasonable regulation and control of the liquid inlet and exhaust speed and construction of the rotational flow stirring capacity are achieved, and the spheroidizing efficiency and quality are improved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a velocity-controlled swirling flow spheroidizing method in a ladle of nodular cast iron. Background technique [0002] The nodular cast pipe is centrifugally cast with ductile iron, and the molten iron needs to be spheroidized. When a nodulizer such as magnesium or magnesium-containing alloy is used, the nodulizer is sent into the high-temperature molten iron through the nodulizer, and the nodulizer encounters high temperature. The molten iron is gasified, dispersed in the molten iron, and undergoes spheroidization reaction with the molten iron. [0003] During the nodulizing operation in production, the casing containing the nodulizing agent is sent into the molten iron with the help of the operating rod of the nodulizing device. The casing has a cavity, and a through hole is opened on the wall of the casing, and the cavity and the molten iron pass through. The through hole is...

AI Technical Summary

Problems solved by technology

[0004] The through hole of the shell of the spheroidizing device is used as the liquid inlet and exhaust flow channel to determine the spheroidization process and the above-mentioned dynamic balance process. At present, the design of the caliber and quantity of the through hole is mainly used to ensure the spheroidization effect, and this kind of through hole is basically For straight holes with equal diameters, because the liquid inlet and exhaust are carried out at equal sections, if the hole diameter is too large, the nodulizer will be released too quickly, and the uniformity of the nodulizer will be poor. If the hole size is set too small, although the nodulizer gas inside the cavity The spheroidizing agent can still be released when the pressure is generated, but after the pressure is restored, the molten iron may not enter smoothly.

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