CN2420085Y

CN2420085Y - Built-in soft contact flowing control crystallizer

Info

Publication number: CN2420085Y
Application number: CN 00211409
Authority: CN
Inventors: 徐广儁; 赫冀成
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2000-04-07
Filing date: 2000-04-07
Publication date: 2001-02-21
Anticipated expiration: 2010-04-07

Abstract

The utility model relates to a built-in soft contact flowing control crystallizer, which is composed of a crystallizer, an induction coil, an electromagnet, filling material, etc. The utility model is characterized in that the meniscus region in the copper wall of the crystallizer is slotted and filled with filling material and the electromagnet which can produce a stable magnetic field is arranged in a water gap zone of the crystallizer. The utility model realizes the function that the soft contact electromagnetic pressure can be directly exerted in the initial solidification zone of molten steel in the crystallizer, exerts the functions of soft contact, pressure regulation, etc. of the magnetic field to metal, effectively enhances the surface quality of continuous casting slabs, and improves the internal quality of the continuous casting slabs with a flow control function.

Description

Built-in soft contact flow crystallization control device

The utility model belongs to metallurgy ingot casting equipment, used built-in soft contact flow crystallization control device in particularly a kind of continuous casting.

The principle of soft-contact mould continuous casting electromagnetic is to utilize the electromagnetic pressure in the electromagnetic field to alleviate the static pressure of molten steel to crystallizer wall, thereby reaches the purpose that molten steel and crystallizer wall solidify under the state of " the soft contact ".Traditional soft contact structure of mould generally is at the external metallization liquid level place of crystallizer wall one induction coil to be set, and pass to alternating current therein, the electromagnetic field that makes this coil produces an electromagnetic pressure radially in the initial solidification district of crystallizer (meniscus surface area), simultaneously, vertically cut some joint-cuttings and form distinguish insulation and independent water-cooling structure along it on the top of crystallizer (meniscus surface area), to avoid the shielding action of crystallizer wall electromagnetic force.Electromagnetic pressure just can see through joint-cutting and affact on the molten steel like this, thereby alleviates the static pressure of molten steel to wall, realizes that soft contact solidifies.But crystallizer wall joint-cutting technology is to avoid it to the shielding action of electromagnetic force.In fact, most electromagnetic forces can't be applied to metal bath surface owing to the shielding action of crystallizer and get on, and therefore, the waste of electromagnetic force is very big; In addition, the distribution of electromagnetic force in crystallizer is also very inhomogeneous, often needs to take homogenize measure again; And when the horizontal oscillation mark of continuous casting billet is waited until improvement, but usually make the continuous casting billet surface produce the lengthwise streaking of projection at the joint-cutting place, produce new surface quality defect; Simultaneously, kerf structure has formed a lot of independent water-cooled unit, makes the water cooling system of crystallizer very complicated.In order to address these problems, (application number: 00110073.4) this built-in soft-contact mould has not only fundamentally been cancelled the split-type structure of crystallizer to have developed built-in soft-contact mould, make electromagnetic force obtain utilizing greatly, and greatly simplified the body construction of crystallizer, make the processing of crystallizer and make more simple and convenient.But the main effect of soft-contact mould technology is to improve slab surface quality, it to the strand internal soundness to improve effect unsatisfactory.The principle of crystallizer flow control technique is to utilize the conduction molten steel to move and cutting magnetic line in constant magnetic field, thereby portion produces induced current within it, and this induced current produces the brake force opposite with the molten steel flow direction with the externally-applied magnetic field interaction and controls the flow regime of molten steel in crystallizer.It can not only stable meniscus, suppresses the speed that the mouth of a river goes out stream, reduces the impact depth of sinking, and can control the flow field between the magnetic pole of top and the bottom effectively, reduces effectively to be mingled with rerum natura slab quality defective, improves the quality of continuous casting billet.But the main effect of flow control mold is an internal soundness of improving continuous casting billet under the high pulling rate condition, and its effect of improving to the surface quality of continuous casting billet is not clearly.

The purpose of this utility model is to provide a kind of can improve cc billet surface quality, can improve the strand internal soundness again, eliminates the built-in soft contact flow crystallization control device of crystallizer splitted structure to the shielding action of electromagnetic force simultaneously again.

The utility model is that induction coil is adopted built-in mode, be placed on the inboard meniscus surface area of crystallizer copper wall, coil can be with 2～6 circles, make by square or circular copper pipe, diameter is about 6～12MM, passes to the alternating current of about 20KHZ, and coil is a hollow-core construction, inner water flowing cooling is filled with packing material.Like this; both cancelled the crystallizer wall between induction coil and the molten steel, and made induction coil can directly correspondingly melt steel, the electromagnetic force that coil is produced directly affacts on the molten steel; completely cut off molten steel with packing material again and contacted, coil has been shielded with the direct of coil.When induction coil feeds alternating current, because a packing material heat conduction and non-conductive, can not produce induced current and magnetic field is produced shielding action owing to portion within it.Simultaneously, because it has the capacity of heat transmission, process of setting still can normally carry out.Like this, utilize the soft contact action at meniscus place, improve slab surface quality.The electromagnet that produces constant magnetic field is placed on the mold gap zone, and (dc voltage can not be higher than safe voltage (36V), generally selects 10～20V to be advisable to pass to permanent steady electric current therein.) to produce constant magnetic field, the magnetic induction intensity in its magnetic field center cross section should be greater than 0.1T.Utilize this magnetic field to come the flow regime of molten steel in the crystallization control device, reach the purpose of improving the strand internal soundness.

Further narrate content of the present invention below in conjunction with drawings and Examples.

Fig. 1 is a semi-section schematic diagram of the present utility model,

Fig. 2 is the semi-section schematic diagram of the another kind of embedding structure of the utility model,

The structural representation that Fig. 3 implements on split type vibrating crystallizer for the utility model.

Among the figure: 1 crystallizer copper wall, 2 induction coils, 3 electromagnet, 4 mouths of a river, 5 tundish.

Induction coil is placed the inboard meniscus surface area of crystallizer copper wall, its built-in mode dual mode as depicted in figs. 1 and 2:

Fig. 1 makes banded flute profile with the inboard copper wall of crystallizer, the induction coil integral body of appearance insulation is placed in the inside, coil is generally 2～6 circles, fill up with the groove of packing material then the inboard copper wall of crystallizer, induction coil is fixed on the inside firmly, and used packing material is heat conduction and non electrically conductive material.Fig. 2 makes the helical form flute profile with the inboard copper wall of crystallizer, then the induction coil of appearance insulation is placed wherein, fills with packing material then, and induction coil is firmly fixed inside, and used packing material is heat conduction and non electrically conductive material.

Embodiment: the application of the utility model on split type vibrating crystallizer.

As shown in Figure 3: meniscus surface area is provided with induction coil 2 in split type vibrating crystallizer copper wall 1, with the packing material filling induction coil and crystallizer are linked together securely, full width single bar-type electromagnet 3 is arranged on the mold gap zone, in order to increase the brake area width, the width of magnet should suitably strengthen, and pass to permanent steady electric current (direct current) therein, its voltage must not be higher than safe voltage (36V), generally be selected in 10～20V and be advisable, its current strength is selected to guarantee that the magnetic induction intensity of magnetic field center section is greater than 0.1T.Like this, utilize this magnetic field to come the flow regime of molten steel in the crystallization control device.Like this, just the soft contact technique of crystallizer and flow control technique are combined and constitute built-in split and vibrate soft contact flow crystallization control device.Molten steel in the tundish 54 enters crystallizer from the mouth of a river, and solidifies therein.When applying alternating current and permanent surely electric current respectively in induction coil and electromagnet, the molten steel at meniscus place will be subjected to the effect of electromagnetic pressure, thereby alleviates the pressure of molten steel to crystallizer wall, is implemented in the purpose of solidifying under the soft contact condition; Simultaneously, the molten steel in zone, the mouth of a river also can correspondingly be subjected to the effect of constant magnetic field, realizes the purpose of the MOLTEN STEEL FLOW state in the crystallization control device.

The utility model not only makes the electromagnetic pressure of soft contact can directly act on the initial solidification district of molten steel in the crystallizer, avoided crystallizer wall to the shielding action of electromagnetic field and the damage problem of high-temperature molten steel, performance magnetic field is to effects such as the soft contact of metal, pressure adjustings, improve the surface quality of continuous casting billet effectively, and, have mobile control function again, improve the internal soundness of continuous casting billet.Simultaneously, the utility model is simple in structure, convenient processing and manufacture.

Claims

1, a kind of crystallizer that comprises is characterized in that at the inboard meniscus surface area of this crystallizer copper wall coil being set at interior built-in soft contact flow crystallization control device, and the electromagnet that can produce constant magnetic field is set in the mold gap zone.

2, built-in soft contact flow crystallization control device according to claim 1 is characterized in that the mode that induction coil is set in crystallizer copper wall inboard has two kinds:

A. the inboard copper wall of crystallizer is made banded flute profile, and the induction coil integral body that appearance is insulated is placed in the inside, fills up with the groove of packing material with the inboard copper wall of crystallizer;

B. the inboard copper wall of crystallizer is made the helical form flute profile, and the induction coil of appearance insulation is placed wherein, fills with packing material.

3, built-in soft contact flow crystallization control device according to claim 1 and 2 is characterized in that the coil in the inboard copper wall of crystallizer is generally 2～6 circles.

4, built-in soft contact flow crystallization control device according to claim 1 is characterized in that used packing material is heat conduction and non electrically conductive material.

5, built-in soft contact flow crystallization control device according to claim 1, it is characterized in that at the electromagnet that the mold gap zone is provided with being that full width wall scroll shape inside passes to permanent steady electric current (direct current), voltage must not be higher than safe voltage, generally should be advisable at 10～20V, its electric current is selected to guarantee that the magnetic induction intensity of magnetic field center section is greater than 0.1T.

6, built-in soft contact flow crystallization control device according to claim 1, it is characterized in that the coil that is placed in the inboard copper wall of crystallizer is generally 2～6 circles, make by square or circular copper pipe, diameter is about 6～12MM, pass to the alternating current of about 20KHZ, coil is a hollow-core construction, inner water flowing cooling.