KR20120063713A - Roll segment for continuous casting system - Google Patents

Abstract

PURPOSE: A roll segment of a continuous casting system is provided to stably manufacture slab having various properties without changing the number or roll segments. CONSTITUTION: A roll segment of a continuous casting system comprises a lower frame(101), an upper frame(102), pinch rolls(103), idler rolls(104), lower heat insulating plates(105), and upper heat insulating plates(106). The pinch rolls press slab passing through the upper and lower frames. The idler rolls are installed at regular intervals as being flush with the pinch rolls in the lower frame and transfer the slab. The lower heat insulating plates are installed between the pinch rolls and the idler rolls and between the idler rolls. The upper heat insulating plates are installed to be flush with the pinch rolls in the upper frame. The slab is provided with heat selectively from the upper and lower heat insulating plates while being transferred by the idler rolls through the pinch rolls.

Description

ROLL SEGMENT FOR CONTINUOUS CASTING SYSTEM

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll segment for solidifying and drawing molten metal having passed through a mold in a continuous casting machine, and more particularly, to a roll segment of a continuous casting machine capable of manufacturing various kinds of cast pieces having a certain quality.

Continuous casting is a casting method in which molten metal is continuously injected into a mold, and the reacted slabs are continuously drawn out from the bottom of the mold to obtain casts such as billets, blooms, slabs, and the like. to be. Such continuous casting can produce large products simply and quickly at low cost.

In addition, in the continuous casting, a plurality of roll segments are continuously installed in the continuous casting facility in order to take out the castings, and the castings passing through these roll segments are used after being loaded when the thickness is 200 mm or more, If it is relatively thin, less than 120 mm, it is immediately rolled.

On the other hand, depending on the speed (ie, casting speed) of the slab passing through the roll segments, the steel finally produced will have different properties. That is, various kinds of steel are manufactured by adjusting the speed of cast steel. At this time, the faster the cast steel passes through a relatively larger number of roll segments. For this reason, the continuous casting facility sets the number of roll segments in consideration of the speed of the fastest cast.

However, the slabs passing through the roll segments at a speed slower than the speed of the fastest slabs also pass the number of roll segments set in consideration of the speed of the fastest slabs. At this time, the cast piece passes through many roll segments unnecessarily. Generally, the cast piece is drawn out of the roll segment and cooled to solidify. For this reason, when the cast steel passes through more roll segments than necessary, there is a problem that the temperature of the cast steel gradually decreases, and eventually the cast steel has a quality low enough that rolling is impossible. In addition, although the number of roll segments may be set to match the speed of the cast steel, when the number of roll segments is added or decreased, the continuous casting facility has to be stopped, and there is a problem that the work of adding and decreasing roll segments is cumbersome.

The present invention seeks to provide a roll segment of a continuous casting plant capable of withdrawing a cast having a quality suitable for rolling regardless of the speed of the cast.

In addition, the present invention is to provide a roll segment of the continuous casting equipment that can be installed in a certain number irrespective of the speed of the cast, to prevent the work interruption in accordance with the change of the speed of the cast.

The present invention provides a roll segment of a continuous casting facility for drawing a cast, the lower frame; An upper frame spaced apart above the lower frame; A pair of pinch rolls installed on the upper frame and the lower frame so as to face each other, for pressing a slab passing between the lower frame and the upper frame; Idler rolls which are installed on the lower frame at regular intervals while forming the same surface as the pinch rolls installed on the lower frame, and transport the cast pieces; Lower heat insulating plates installed between the pinch roll and the idler roll, and between the idler rolls installed in the lower frame and generating heat; And upper heat insulating plates installed on the upper frame so as to form the same surface as the pinch rolls installed on the upper frame, and generating heat, wherein a cast piece is transferred by the idler rolls through the pinch rolls. The present invention discloses a roll segment of a continuous casting machine, characterized in that heat can be provided from the upper heat insulating plates and the lower heat insulating plates.

In addition, the plurality of roll segments are connected in series, and as the speed of the slab passing through the roll segments increases, the number of roll segments that generate heat from the upper heat insulating plate and the lower heat insulating plate is reduced. A roll segment of a continuous casting machine is disclosed.

The roll segment further includes a spray nozzle installed on the upper heat insulating plates and the lower heat insulating plates to spray a cooling water to the cast steel to cool the cast steel. .

The roll segment of the continuous casting plant according to the present invention has the following effects.

(1) The roll segment according to the present invention includes a lower frame, an upper frame, pinch rolls, idler rolls, lower heat insulating plates and upper heat insulating plates, in particular, the lower heat insulating plates and the upper heat insulating plates generate heat. The cast steel can be kept warm. Therefore, even when the speed of the cast piece drawn out through a plurality of consecutively connected roll segments is less than or equal to the maximum cast rate, the cast pieces are not held and cooled by the lower heat insulating plates and the upper heat insulating plates, and are maintained at a constant temperature to maintain a constant quality. Can be maintained. Therefore, the roll segment according to the present invention has the effect that the cast can be pulled out at a quality suitable for rolling regardless of the speed of the cast.

(2) Since the roll segment according to the present invention can pull out a cast having a temperature suitable for rolling regardless of the speed of the cast, it is possible to stably manufacture casts having various properties without changing the number of roll segments. Has an effect.

1 is a perspective view showing a cut part of a roll segment according to a preferred embodiment of the present invention.
FIG. 2 is a left side view showing the roll segment shown in FIG. 1.
3 is a view schematically showing a state in which a plurality of roll segments shown in FIG. 1 are continuously connected to constitute a continuous casting facility.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

FIG. 1 is a perspective view showing a portion of a roll segment 100 cut according to a preferred embodiment of the present invention, and FIG. 2 is a left side view showing the roll segment 100 shown in FIG.

As shown in Figure 1, Figure 2, the roll segment 100 according to a preferred embodiment of the present invention is a lower frame 101, upper frame 102, pinch rolls (103, pinch rolls), idler roll ( 104; including the idler rolls, the lower heat insulating plate 105 and the upper heat insulating plate 106, to maintain the temperature of the cast steel 10 drawn out through the roll segment 100 to a quality suitable for rolling (10) is guided to the rolling process.

The lower frame 101 is fixedly installed on the ground, and the upper frame 102 is spaced apart above the lower frame 101 and is movable up and down with respect to the lower frame 101.

The pinch rolls 103 are formed in a pair and are respectively installed on the lower frame 101 and the upper frame 102, and face each other. Cast slab 10 is pressed between the lower frame 101 and the upper frame 102, while passing between the pinch rolls 103. For this reason, the slab 10 has a thickness to be obtained. In addition, by moving the upper frame 102 in the vertical direction, the gap between the pinch rolls 103 is adjusted.

The idler rolls 104 are installed on the lower frame 101 at regular intervals while forming the same plane as the pinch rolls 103 installed on the lower frame 101. The idler rolls 104 transfer the slabs 10 between the pinch rolls 103, and continuously transfer the slabs 10 passed between the pinch rolls 103. In addition, the rotational speed of the idler rolls 104 affects the speed of the cast piece in combination with the rotational speed of the pinch rolls 103.

The lower heat insulating plate 105 is installed between the pinch roll 103 and the idler roll 104 and the idler roll 104 installed in the lower frame 101, and generates heat. Heat generated from the lower heat insulating plates 105 is provided to the slab 10, particularly the lower surface of the slab 10, passing between the lower frame 101 and the upper frame 102.

The upper heat insulating plate 106 is installed on the upper frame 102 while forming the same plane as the pinch roll 103 installed on the upper frame 102 and generates heat. Heat generated from the upper heat insulating plates 106 is provided to the slab 10, particularly the upper surface of the slab 10, passing between the lower frame 101 and the upper frame 102.

In general, the slab 10 is cooled in the process of drawing out through the roll segment 100, the temperature is reduced. However, the upper thermal insulation boards 106 combine with the lower thermal insulation boards 105 to provide heat to the slab 10 passing between the lower frame 101 and the upper frame 102. As a result, heat provided from the lower heat insulating plates 105 and the upper heat insulating plates 106 may be transferred from the surface of the slab 10 to the inside, so that the slab 10 may maintain a constant temperature.

Meanwhile, although not specifically illustrated, spray nozzles may be installed on the lower heat insulating plates 105 and the upper heat insulating plates 106. The spray nozzle sprays cooling water onto the cast steel 10 to cool the cast steel 10. This spray nozzle is not used at the same time as the lower thermal plates 105 and the upper thermal plates 106.

3 is a view schematically showing a state in which a plurality of roll segments 100 shown in FIG. 1 are continuously connected to constitute a continuous casting facility. As shown in FIG. 3, a plurality of roll segments 100 according to the present invention may be provided in plural and continuously connected to form a continuous casting facility. On the other hand, this embodiment shows an example in which five segments 100 are connected in series. However, the number of roll segments 100 connected in succession is not limited thereto and may be changed in consideration of the maximum speed of the cast piece 10 drawn out from the mold 200 through the roll segments 100.

When the configuration consisting of the five roll segments 100 of the present embodiment is a configuration capable of withdrawing the slab 10 from the mold 200 for a slab speed of up to 5 m / s, at a speed of 5 m / s The withdrawn cast piece remains rollable after passing through all five roll segments 100. In this case, the lower thermal insulation board 105 (shown in FIG. 1) and the upper thermal insulation board 106 (shown in FIG. 1) of the roll segments 100 may or may not generate heat. It is preferable not to generate heat.

On the other hand, when the cast is drawn out at a speed of 3 m / s in the configuration consisting of the same five roll segments 100, the cast is at a temperature suitable for rolling in the state passing through the three roll segments 100, but additionally While passing through the two roll segments 100, the temperature of the cast piece is further cooled and becomes unrollable. Thus, the remaining two roll segments 100 must generate heat from the lower heat retaining plates 105 and the upper heat retaining plates 106. Because of this, the cast steel drawn out at a speed of 3 m / s is retained while passing through the two roll segments 100, even if passing through the two roll segments 100, so that after rolling through the roll segments 100 It becomes That is, the lower heat retaining plate 105 and the upper heat retaining plate 106 perform a heat retaining function on the cast steel drawn out below the maximum casting speed in a continuous casting facility composed of a plurality of roll segments 100. Thus, the cast piece 10 remains rollable even after being drawn through the roll segments 100 despite an increase in the number of roll segments 100.

The roll segment 100 of the continuous casting facility according to the present invention can be provided with a continuous casting facility of a constant scale irrespective of the speed of the cast, to stably produce a cast having a variety of properties according to the speed of the cast. .

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention.

100: roll segment 101: lower frame
102: upper frame 103: pinch roll
104: idler roll 105: lower heat insulating plate
106: upper heat plate

Claims (3)

In the roll segment of the continuous casting equipment to take out the cast steel,
Lower frame;
An upper frame spaced apart above the lower frame;
A pair of pinch rolls installed on the upper frame and the lower frame so as to face each other, and pressing the slabs passing through the lower frame and the upper frame;
Idler rolls which are installed on the lower frame at regular intervals while forming the same surface as the pinch rolls installed on the lower frame, and transport the cast pieces;
Lower heat insulating plates installed between the pinch roll and the idler roll, and between the idler rolls installed in the lower frame and generating heat; And
Including the upper heat insulating plate is installed on the upper frame to generate the same surface as the pinch roll installed on the upper frame, and generates heat,
A cast segment is passed between the pinch rolls and transported by the idler rolls, and selectively receives heat from the upper and lower insulation plates. The method of claim 1,
The roll segment is composed of a plurality of continuously connected,
And as the speed of the slab passing through the roll segments increases, the number of roll segments that generate heat from the upper and lower heat insulating plates decreases. The method of claim 1, wherein the roll segment,
And a spray nozzle installed on the upper heat insulating plates and the lower heat insulating plates to spray the cooling water to the cast steel to cool the cast steel.

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