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A method for improving solidification quality of vacuum induction furnace ingot casting

A vacuum induction furnace and ingot casting technology, applied in ingot workshops, casting workshops, casting equipment, etc., can solve the problems of shrinkage cavity accompanying inclusions, reduced heat transfer efficiency, loose center, etc., to improve solidification quality, increase transmission Thermal capacity, the effect of rapid cooling

Active Publication Date: 2020-10-13
JIANGSU JICUI ADVANCED METAL MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molten steel solidifies and shrinks in the ingot mold, forming a gap between the ingot and the ingot mold, changing the heat transfer mode from heat conduction to heat radiation, and greatly reducing the heat transfer efficiency
In addition, the heat transfer efficiency of the ingot mold itself is slow, and as the temperature of the ingot mold increases, the heat transfer capacity further deteriorates
[0004] Therefore, ingots obtained by natural cooling, especially medium and large ingots, are prone to problems such as center segregation, center porosity, shrinkage cavities and accompanying inclusion accumulation
[0005] In industrial production, only low superheat casting can be used, but in order to avoid nozzle blockage, the superheat should not be too low, and the effect is effective

Method used

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  • A method for improving solidification quality of vacuum induction furnace ingot casting
  • A method for improving solidification quality of vacuum induction furnace ingot casting
  • A method for improving solidification quality of vacuum induction furnace ingot casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] For ingot production with a diameter of Ф410mm or less, the combined application steps of water-cooled copper ingot mold device 5 and helium cooling conduit:

[0024] (1) Before the vacuum induction furnace smelting is about to be completed, the ingot mold trolley 7 in the ingot mold chamber 6 sends the water-cooled copper ingot mold device 5 to the casting position;

[0025] (2) Water-cooled copper ingot mold device 5 is cooled by water; water pressure: 0.4~0.5MPa;

[0026] (3) After the smelting / refining is completed, the crucible 3 is turned over and casting is started; the molten steel is poured into the chute 4, and then injected into the ingot mold from the chute 4;

[0027] (4) After casting for 5 minutes, start helium (He); helium pressure: 0.3~0.4MPa;

[0028] (5) After the casting is completed, continue to pass helium for 5 minutes;

[0029] (6) After the ingot is completely solidified, stop the water, and move the ingot mold and ingot out of the ingot mold ...

Embodiment 2

[0031] Ingot production with a diameter of Ф410mm or more, combined application steps of water-cooled copper ingot mold device 5 and helium cooling duct:

[0032] (1) Before the vacuum induction furnace smelting is about to be completed, the ingot mold trolley 7 in the ingot mold chamber sends the water-cooled copper ingot mold device 5 to the casting position;

[0033] (2) Water-cooled copper ingot mold device 5 is cooled by water; water pressure: 0.4~0.5MPa;

[0034] (3) After the smelting / refining is completed, the crucible 3 is turned over and casting is started; the molten steel is poured into the chute 4, and then injected into the ingot mold from the chute 4;

[0035] (4) After casting for 8 minutes, start helium (He); helium pressure: 0.35~0.45MPa;

[0036] (5) After the casting is completed, continue to pass helium for 10 minutes;

[0037] (6) After the ingot is completely solidified, stop the water, and move the ingot mold and ingot out of the ingot mold chamber. ...

Embodiment 3

[0039] For the production of ingots with a diameter of Ф410mm or less, the water-cooled copper ingot mold device is used alone in 5 steps:

[0040] (1) Before the vacuum induction furnace smelting is about to be completed, the ingot mold trolley 7 in the ingot mold chamber sends the water-cooled copper ingot mold device 5 to the casting position;

[0041] (2) Water-cooled copper ingot mold device 5 is cooled by water; water pressure: 0.4~0.5MPa;

[0042] (3) After the smelting / refining is completed, the crucible 3 is turned over and casting starts; the molten steel is poured into the chute 4, and then poured into the ingot mold from the chute 4;

[0043] (4) After the ingot is completely solidified, stop the water, and move the ingot mold and ingot out of the ingot mold chamber.

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Abstract

The invention provides a device for improving cast ingot solidification quality of a vacuum induction furnace. The vacuum induction furnace comprises a feeding chamber, a smelting chamber, a crucible,a chute, a water-cooling copper ingot mold device, an ingot mold chamber and an ingot mold trolley. The device for improving the cast ingot solidification quality is the water-cooling copper ingot mold device or combination of the water-cooling copper ingot mold device and a helium cooling conduit, the water-cooling copper ingot mold device takes away heat of a cast ingot by the aid of a rapid water flow function, so that the cast ingot is rapidly cooled, and the cast ingot solidification quality is improved. The helium cooling conduit leads helium into the gap between the cast ingot and an ingot mold, heat transfer at the gap is improved, so that the heat of the cast ingot is taken away, the cast ingot can be rapidly cooled, and the cast ingot solidification quality is improved.

Description

technical field [0001] The invention belongs to the field of special metallurgy and relates to a method for improving the solidification quality of an ingot cast in a vacuum induction furnace. Background technique [0002] Vacuum induction melting is an important smelting equipment for the production of special steel, precision alloys, high-temperature alloys, and corrosion-resistant alloys. It is a complete set of equipment integrating various technologies such as machinery, electronics, and vacuum. The basic production process is to melt and refine the raw materials in the crucible by induction heating in a high-vacuum environment, and then directly or indirectly pour them into the ingot mold and cool them to shape. [0003] At present, the cooling method of vacuum induction furnace ingot mold is mainly natural cooling. This cooling method has the problems of low cooling rate and long solidification period. The solidification and shrinkage of molten steel in the ingot mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D9/00B22D7/06
CPCB22D7/064B22D9/003
Inventor 王国栋张丕军沈海军王建伟
Owner JIANGSU JICUI ADVANCED METAL MATERIAL RES INST CO LTD