JPS62183941A - Molten metal supplying equipment for caterpillar type continuous casting machine - Google Patents

Abstract

PURPOSE:To prevent development of wrinkling and double skin on a surface of casting sheet by inserting a molten metal supplying nozzle into a mold direct ly and making adjustable a gap between the nozzle and an inner face of the mold at producing the casting sheet from the molten metal by a caterpillar type continuous casting machine. CONSTITUTION:At producing the continuous casting sheet by pouring the molten metal between the caterpillar type lower belt 1 and upper belt 3, which circulate endlessly by belt-pulleys 2, 4, the molten metal supplying nozzle 13 having almost the same shape for its end part as inner section of the mold, is provided at inlet side of the mold formed by both belts 1, 3 and dam-blocks, and a reserver 10 positioned by an upper supporting roll 18 and a gap adjusting roll 19 to the both belts, is arranged. The molten metal in a tundish 7 is poured through a molten metal supply controlling nozzle 8 and a submerged nozzle 9, to pour into the mold through the molten metal supplying nozzle 13. In the process of solidifying for the molten metal in the mold, after the molten metal is once solidified, it is remelted and further solidified once more, and so development of wrinkling and double skin on the surface of castng sheet is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to hot water supply equipment for twin-belt casters, that is, continuous track casting machines.

More specifically, the present invention makes it easy to center and attach a hot water supply nozzle to a mold inlet in a track type continuous casting machine, and furthermore, it is possible to maintain an appropriate gap between the nozzle and the inner wall of the mold at all times. Regarding possible hot water supply equipment.

The mold of the conventional continuous track type continuous casting machine is as shown in Fig. 8.
The dam block 5 is sandwiched between the side parts of the upper and lower belts 1.3, and the structure is inclined downward. As shown, the dam block 5 is guided by the dam block roll 6 on the mold entry side, while the slab 15 is taken out from the mold exit side. Conventionally, molten metal 14 is supplied to this mold by flowing down onto the lower belt 1 from a supply amount 12 as shown in FIG. Therefore, the molten metal 14 is cooled even from the downstream point of the lower belt 1 until it flows into the mold at point L, and starts to solidify at the contact surface with the lower belt 1, but is subsequently supplied later. is remelted by molten metal.

Furthermore, the mold surface 16 constantly fluctuates along the lower belt 1 due to fluctuations in the amount of hot water supplied or the amount of hot water flowing into the mold, and this also causes the molten metal 14 to repeatedly solidify and remelt. In this way, the lower surface of the slab 15 undergoes a complicated solidification process, and wavy wrinkles called molten metal wrinkles are formed on the surface, and in severe cases, the molten metal further covers the solidified film, causing the solidified film to A surface called double skin is formed.

These surface defects on the slab can cause blemishes and other defects in the subsequent rolling process, so they must be removed (surface treatment is required,
Untreated rolled products cannot be made into products. In addition, the molten metal 14 flowing down from the hot water supply amount 12 also flows up from the flow point to the side opposite to the mold surface, and the smaller the inclination angle θ of the mold, the more the molten metal 14 overflows beyond the upper limit U point of the mold surface 16. easy. In addition, the variation along the lower belt 1 with respect to the variation in the vertical distance of the molten metal surface 16 in the mold is magnified as the inclination angle θ of the mold is smaller. Since it is easy to overflow beyond the upper limit U point of 16, the problem is extremely dangerous.

Therefore, the best method to avoid the above problem has been considered to be to maintain the meniscus outside the continuous casting machine by inserting a hot water supply nozzle directly into the mold, but this method is insufficient due to the following problems. At present, it has not yet been put into practical use.

(1) If the gap between the mold wall and the nozzle outer periphery is too large due to the static pressure of the molten metal between the nozzle tip and the meniscus, the molten metal will leak from this location.

(2) Regarding problem (1) above, if the gap is made too small, thermal deformation of the nozzle tip or thermal strain deformation of the upper and lower belts that make up the mold wall may occur. This may cause damage to the lubricating layer and heat insulating layer coated on the belt surface, or in severe cases, damage to the belt itself.

(3) Even if the appropriate gap is set before pouring, the gap may fluctuate due to thermal deformation of the pedestal supporting the hot water supply nozzle or deflection of the pedestal due to the weight load of the molten metal.

(4) To prevent molten metal from adhering to the tip of the nozzle, causing base metal to grow from there and clogging the nozzle hole, it is necessary to preheat the hot water supply nozzle before starting pouring. However, there is a risk of burning out the belt if it is set in the retracted position inside the continuous casting machine, so it must be heated in a retracted position outside the continuous casting machine.

(5) Even if preheating is performed using the method shown in (4), it takes time to move the hot water supply nozzle from the retreat position to the casting position, center it to maintain an appropriate gap, and fix it to the frame. Parts with low heat capacity, such as the tip, cool down quickly.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned problems of the prior art, and more specifically, to solve the problems of the prior art described above. To provide hot water supply equipment for a machine, in which a hot water supply nozzle can be easily installed and removed in a mold, and furthermore, the gap between the hot water supply nozzle and the inner wall surface of the mold can be adjusted.

Means for Solving the Problems According to the invention, a continuous track casting machine is provided, in which the mold is constructed of upper and lower belts and dam blocks arranged between the sides of the upper and lower core belts. Hot water supply equipment, which has an outer surface complementary to the shape of the upper belt on the entrance side of the mold and can be inserted into and removed from the mold, and whose tip has a cross section that is approximately the same shape as the inner cross section of the mold. There is provided a hot water supply equipment characterized by comprising: a reservoir forming a hot water supply nozzle; and a kundish connected to the reservoir via a submerged nozzle.

Further in accordance with one aspect of the invention, the reservoir may include a gap adjustment roll that abuts the lower belt and is eccentrically bearing; It may also include a roll.

Further according to a preferred embodiment of the invention, the reservoir comprises:
An upper support roll is provided at a location facing the upper belt at the insertion position.

Function: The reservoir of the hot water supply equipment of the track type continuous casting machine according to the present invention can be easily removed from the mold, and the hot water supply nozzle is preheated in the standby position and quickly inserted into the mold to be heated to an appropriate temperature. Hot water supply can be started in this state.

Furthermore, in the hot water supply equipment for the track continuous casting machine of the present invention, the front part of the reservoir has a shape that is almost similar to the inner shape of the mold, and can be easily inserted into the mold by advancing the reservoir. Can be inserted and installed. Further, the hot water supply nozzle provided at the tip of the reservoir has the same dimensions as the inner cross section of the mold, so there is no fear of leakage of hot water unlike in the prior art.

Furthermore, by providing a roll in contact with the lower belt and eccentrically bearing in the reservoir of the hot water supply equipment of the continuous track type continuous casting machine of the present invention, the vertical gap between the hot water supply nozzle and the inner wall surface of the mold is adjusted and maintained. can do. Similarly, by providing rolls on both sides of the reservoir that abut the sides of the dam block, the movement of the reservoir can be easily positioned in the transverse direction, and by eccentrically bearing these rolls, it is possible to easily position the reservoir in the transverse direction. The lateral gap with the inner wall surface of the mold can be adjusted and maintained.

Hereinafter, the present invention will be explained in detail by way of examples with reference to the accompanying drawings.

Embodiment FIGS. 1 and 2 are a plan view, right side view, and a side view, respectively, partially in section, showing a state in which the hot water supply equipment of the present invention is attached to an endless track type continuous casting machine.

In particular, as clearly shown in FIG. 2, the hot water supply equipment of the present invention:
Tandish: L7, immersion nozzle 9 connected to tundish 7 via hot water supply amount control nozzle 8, and immersion nozzle 9
and a reservoir 10 from which hot water is supplied.

The reservoir 10 is supported by a support unit 11, which is slidable on the lower belt 1.

On the other hand, as shown in FIG. 2, the reservoir IO has a front part 10a having a shape complementary to the outer shape of the upper belt 3 wrapped around the upper belt pulley 4 in the inserted state, and a rear part supported by the support unit 11. 10b, and a hot water supply nozzle 13 at the tip.

Furthermore, as shown in FIGS. 1 and 4, the reservoir I
The support unit 11 that supports O is equipped with gap adjustment rolls 19 on both sides thereof. As shown in the figure (the gap adjustment roll 19 is attached to the lower part of the support unit 11, comes into contact with the upper surface of the lower belt 1, and the reservoir 10,
In particular, positioning of the hot water supply nozzle 13 is facilitated.

FIG. 5 and FIG. 6 are diagrams showing the eccentric bearing state of the gap adjustment roll. As shown in FIGS. 5 and 6, the gap adjustment roll 19 is supported by a bearing on the support unit 11. As shown in FIGS. That is, the shaft 19a of the gap adjustment roll 19 is joined to the guide roll shaft 25 in the support unit 11 via the eccentric bushing 24, and as shown in FIG. 6, the shaft 19a and the guide roll shaft 25 are eccentric. Therefore, when the gap adjustment roll 19 is rotated, the support height of the support unit 11 changes according to its rotational position, and the gap adjustment roll 19 is fixed with a nut as shown in FIG. Reference number 26 is a rotation stopper for further fixing the guide roll shaft 25.

Referring again to FIGS. 1 and 4, a pair of rear lateral guide rolls 20 and a pair of front lateral guide rolls 21 are provided on both rear and front sides of the support unit, respectively. These lateral guide rolls 20, 21 are in contact with the inner surface of the dam block 5. These lateral guide rolls 20.21 can be supported by an eccentric bearing mechanism in the same way as the gap adjustment roll 19.

Adjustment of the gap between the inner wall of the mold and the outer edge of the hot water supply nozzle 13 using the gap adjustment roll 19 and the lateral guide rolls 20.21 will be explained with reference to FIG. FIG. 3 is a view taken in the direction of the arrow in FIG. 2. The hot water supply nozzle 13 has four pouring ports, and the gap between the hot water supply nozzle 13 and the lower belt 1 is set at gw+
, the gap with the upper belt 3 is gwz, and the left and right dam blocks 5 are
Let the distance between the inner side wall and the inner side wall be 3,g,I2. By rotating the gap adjustment roll 19, the support unit 11
The height of the hot water supply nozzle 13, that is, the gaps gw+ and gw2 can be adjusted by adjusting the support height position and fixing and holding it at that position. On the other hand, by rotating the lateral guide rolls 20 and 21 with eccentric bearings, the transverse position of the hot water supply nozzle 13 is changed, and by fixing and holding the hot water nozzle 13 at that position, the gaps gN+, g
s2 can be adjusted.

Next, the operation of the hot water supply equipment of the present invention will be described. As shown in FIG. 7, the reservoir 10 is placed on a preheating device 27 placed on the entrance side of the mold. The preheating device 27 includes a guide rail 17 connected to the mold inlet, a preheating frame 22 supporting the guide rail 17, and a preheating burner 23 for preheating the reservoir 10.

The reservoir 10, which has been preheated to a predetermined temperature by the preheating burner 23, is inserted into the mold by suitable means (not shown). At this time, the gaps gwr, gw2, gNI shown in FIG.
In order to adjust Sg, 2, the rotation angle positions of the gap adjustment roll 19 and the lateral guide rolls 20.21 may be adjusted and fixed in advance.

In this way, the reservoir is inserted into the entrance of the mold, which is composed of the upper and lower belts 1.3 and the dam blocks 5 on both sides.

At this time, the reservoir lO is positioned with respect to the upper belt 3 by an upper support roll 18 and with respect to the lower belt 1 by a gap adjustment roll, and in the transverse direction by a lateral guide roll that abuts against the inner side wall of the dam block 5. Positioned at 20.21.

As described in the detailed description of the invention, the hot water supply equipment for the track continuous casting machine according to the present invention is of a type in which the hot water supply nozzle is directly inserted into the mold, and the molten metal is solidified, remelted, and melted during the solidification process.
Phenomena such as coagulation that causes double skin can be completely avoided, and the problems of the prior art described above can also be solved.

That is, in the hot water supply equipment of the present invention, since the gap between the hot water supply nozzle and the mold wall can always be maintained in an appropriate state, it is not affected by thermal deformation of the support frame of the hot water supply nozzle, etc. Further, preheating can be performed outside the track continuous casting machine, and there is no fear of burning out the upper and lower belts that constitute the mold, and installation at the mold entrance after preheating can be performed extremely easily and quickly. Therefore, there is little temperature drop in the hot water supply nozzle after preheating, and problems such as nozzle clogging and metal adhesion do not occur, allowing smooth operation. Furthermore, the hot water supply equipment according to the present invention has a simple structure and can reduce equipment costs.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view showing the hot water supply equipment according to the present invention installed in a continuous track type casting machine, and FIG. 2 is a side view showing a partially sectional view of the water heating equipment shown in FIG. FIG. 3 is a view taken along the six directions in FIG. 2, FIG. 4 is a cross-sectional view of the hot water supply equipment of the present invention, and FIGS. 5 and 6 are views of gap adjustment rolls. Fig. 7 shows the condition of the eccentric bearing, Fig. 7 shows the state of preheating the hot water supply equipment of the present invention, Fig. 8 is a schematic diagram of a continuous track casting machine, and Fig. 9 shows a continuous casting machine of the continuous track type according to the prior art. FIG. 2 is a diagram showing the hot water supply state to the machine. (Main reference numbers) 1. Lower belt, 2. Lower belt pulley, 3. Upper belt, 4. Upper belt pulley, 5. Dam block, 6. Dam block guide roll, 7. Kundish. , 8... Hot water supply amount control nozzle 9... Immersion nozzle, 10...
・Reservoir, 11.. Hot water nozzle support unit, 12.. Water heater, 13.. Hot water nozzle, 14.. Molten metal, 15.
・Slab, 16. Molten metal surface in mold, 17. Guide rail, 18.
- Upper support roll, 19... Gap adjustment roll, 20... Rear lateral guide roll, 21... Front lateral guide roll, 22... Preheating frame, 23... Preheating burner, 24... Eccentric bush, 25... Guide roll shaft, 26... Rotating patent applicant Sumitomo Heavy Industries, Ltd. Sumitomo Metal Industries, Ltd.

Claims (4)

[Claims] (1) A hot water supply equipment for a continuous track casting machine in which a mold is composed of upper and lower belts and a dam block placed between the sides of the upper and lower belts, and the mold is located on the entrance side of the mold. a reservoir having an outer surface complementary to the shape of the upper belt, capable of being inserted into and removed from the mold, and having a distal end forming a hot water supply nozzle having a cross section that is approximately the same shape as the inner cross section of the mold; A hot water supply facility comprising: a tundish connected via an immersion nozzle. (2) The hot water supply equipment for a track continuous casting machine according to claim 1, wherein the reservoir is provided with a gap adjusting roll that is in contact with the lower belt and is eccentrically bearing. (3) The endless track continuous type according to claim 1 or 2, wherein the reservoir is in contact with a side surface of the dam block and includes an eccentrically bearing lateral guide roll. Hot water supply equipment for casting machines. (4) The endless track continuous type according to any one of claims 1 to 3, wherein the reservoir is provided with an upper support roll at a location facing the upper belt at the insertion position. Hot water supply equipment for casting machines.