JPS5916658A - Belt type continuous casting device - Google Patents

Abstract

PURPOSE:To provide a belt type continuous casting device which improves the quality of products and to provide protection to belts by providing means for attracting the belts in the guide parts for the belts forming a casting mold and applying the force for flattening the belts on the belts along the transverse direction thereof. CONSTITUTION:Magnets 14, etc. are disposed as attraction means for applying the force for flattening endless belts 5, 6 of magnetic materials forming a casting mold along the transverse direction thereof to the cooling pads 9, 10 which form a solidifying path 4 and are disposed in an arc shape in the guide parts of the belts 5, 6. The magnets 14 are disposed alternately with small holes 13 for ejecting cooling water. Attraction effects are provided by the magnets 14 over the entire region in the transverse direction of the belts 5, 6 so that the belts 5, 6 are restrained in the adequate positions along the surfaces of the pads 9, 10, thereby maintaining the section of the path 4 uniformly. The product having good quality without any strain in the solidified shell is thus obtd. The errosion of the belts 5, 6 is effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt-type continuous casting apparatus that is particularly suitable for manufacturing wide slab materials, and is designed to improve product quality by preventing belt warping to a large extent. Regarding.

Conventionally, as a belt type continuous casting method, the Probelly method, 8
CR method, Hazelet method, etc. are known.

The former two are widely used for producing rectangular billets with a relatively small casting cross section, and the latter is widely used for wide slab materials. In the casting apparatus for carrying out either method, a solidification path of a predetermined length continuous with a molten metal spout is constituted by molds that move synchronously with each other. In order to facilitate the setting of the solidification length, at least one of the molds is generally an endless belt. Most often used for this belt is a steel strip with a thickness of 1 to 3 meters, and a cooling means is attached to prevent erosion and deformation due to contact with molten metal. Examples include supplying cooling water to the back surface of the belt, applying rapeseed oil, soot, and various other heat-insulating mold release agents to the surface of the belt that comes into contact with the molten metal.

By using such cooling means, continuous casting of steel, aluminum, etc. with low molten metal temperature is possible.
For continuous billet casting of narrow plate widths even with high carbon steel, belt melting, deformation, etc. can be effectively prevented.

However, when casting wide cross-section materials such as slab materials of 600 to 2000 mm, the cooling effect of the belt used is uneven, and thermal expansion deformation in the sheet width direction occurs in the solidification path forming part of the belt. easy.

That is, as a result of the belt center becoming hotter than both side edge portions, the center of the belt bulges toward the molten metal and warps. In addition, on the entrance side of the belt to the coagulation path area, warpage in the width direction due to internal strain due to the flattening action immediately after the guide roller detours appears in combination with the thermal deformation, and this causes a large warp in the belt. occurs (see dashed lines in Figures 1 and 2).

As a result, the warpage of the belt gradually disappears on the exit side of the solidification path, and as a result, the cast product has a concave cross section due to the warp of the belt during the growth process of the solidification shell on the entrance side of the solidification path. The product swelled into a square cross section on the exit side, and the distortion caused cracks in the solidified shell, which adversely affected product quality. In addition, due to the widthwise warping of the belt, the belt separates from the cooling vat, increasing the gap several times, which further reduces the cooling effect and adds to the rise in belt temperature, which can lead to belt melting and melting. There was also the risk of a spill.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a complete belt-type continuous apparatus that can maintain the flatness of the @-type forming belt in the coagulation path, improve product quality, and maintain the belt. For all purposes.

The basic structure of the present invention to achieve this objective is to apply a Chitankai force along the width direction of the belt to the guide portion of the belt constituting the mold to the solidification path that is continuous with the molten metal spout. A magnetic or pneumatic belt suction means is provided.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a tamp pusher, in which molten metal (molten steel) 2 is accommodated in a ladle. 3 is a nozzle serving as a pouring port, which pours continuously onto the molten metal. Continuing from the nozzle 3, a solidification path 4 of a predetermined length is constituted by a pair of molds made up of endless belts 5 and 6 that move synchronously with each other. Each belt 5
, 6 are carbon steel, that is, magnetic material, and the guide rollers 7
．． 8, it is completely wound around the nozzle 3 and introduced into the coagulation path 4. The back side is supported by arc-shaped cooling pads 9 and 10 to form a solidification path 4. Each of the belts 5, 6 is connected to a drive motor (not shown), and wound in a triangular shape or the like by other guide rollers.

Note that 18 and 19 are auxiliary mold structures placed between the belts, which completely close the short side of the molten metal.

Each cooling pad 9.10 is constituted by one side of the water jacket 11°12, and this cooling pad 9.10
Cooling water is injected onto the back surface of the belt 5.6 from a large number of small holes 13 formed at intervals.

In this one, cooling pad 9.10 and belt 5.6
A magnet 14t is disposed as an attraction means for applying a flattening force along the width direction. This magnet 14 is connected to the cooling pad 9. They are made up of permanent magnets that are partially or completely buried in the surface of the lO, and are arranged alternately with small holes 13 for spouting cooling water, as shown in FIGS. 2 and 3.

With such a configuration, the following advantages during casting can be obtained compared to the case where the attractor Rt is not provided.

That is, as shown by the broken line in FIGS. 1 and 2, if there is no suction means, the belt 5.6 will warp in the width direction at the center over a certain range from the mold entry side to the mold exit side. Occur. The amount of warpage δ is determined based on factors such as belt thickness, guide roller diameter D1, belt effective width w1, belt strength and yield point), etc.

In an actual device, the amount of warpage δ was found to reach a certain amount.

Note that since tension T is constantly applied to the belt 5.6 in the longitudinal direction, warpage is suppressed to the extent that warpage occurs, but since there is no tension in the width direction, no natural suppressing force can act. Further, since the force of pressing the belt 5.6 against the welding pad 9.10 side by the static pressure of the molten metal is generally small, this also does not work particularly effectively in preventing warping.

With the structure of the above embodiment in which the suction means is provided, the magnets 14 of the cooling pads 9 and 10 cause the belts 5 and 5 to
The sulfur absorption action acts over the entire widthwise area of the belt 5.6, and the belt 5.6 is restrained at a proper position along the surfaces of the cooling pads 9 and 10, as shown by solid lines, and the cross section of the coagulation path 4 is maintained uniform. Therefore,
It is possible to suppress the cross-sectional change of the molten metal during solidification, and to obtain a product of good quality without distortion of the solidified shell.

In addition, along with the belt 5.6 being changed to civilian clothes, the cooling pad 9.1
Since it is possible to improve the adhesion to zero, it is also effective in preventing belt melting and damage, as described below.

That is, if warpage occurs as in the conventional case, the belts 5 and 6
The gap between the cooling pad 9 and the cooling pad 9.10 increases, and the flow rate of cooling water decreases. This caused a vicious cycle in which the cooling efficiency decreased, the belt temperature further increased, and the warpage further increased. - for membrane devices, gap i 0.2-0.7
The amount of cooling water is determined by setting the cooling water flow rate to 5 to 1 Q m/s, and the belt temperature rise is set to about 250 to 350C. In this case, the gap is, for example, 51IIIV
When C increases, the flow rate of cooling water decreases to about 1/10,
As a result, it has been confirmed that the belt temperature increases to 500 to 700C.

On the other hand, according to the configuration of the above embodiment in which the belt 5.6 is attracted to the cooling pad 9° 10 side by the magnet 14, the increase in the gap can be completely prevented, so the required flow rate of the cooling water is maintained and the belt temperature is lowered. rise? It is something that can be prevented.

Incidentally, the relationship between the belt attraction force and the gap in the above embodiment is shown in FIG. 4, comparing the effects when implemented for a cobalt magnet and a ferrite magnet. Bell) 5.6 was 1.2W thick. In this way, the effect of reducing the gap G was confirmed depending on the magnet characteristics.

In the above embodiment, the magnets 14 and the small holes 13 for discharging cooling water were arranged alternately in the cooling pad 9.10, but the fifth
As shown in FIG. 6, the small hole 13 is inserted into the cooling pad 9.
The magnets 10 may be centrally arranged at the center of the magnet 10, and the magnets 14 may be arranged in a digit shape on both sides of the magnet 10 through seven gaps so that the cooling water flows out to both sides. According to this configuration, the cooling water flows out through the water channels between the magnets, and both the belt cooling and sliding are performed smoothly, thereby improving the cooling effect and ensuring reliable belt positioning.

Furthermore, in each of the above embodiments, the attraction means is a permanent magnet.
As shown in FIGS. 7 and 8, an electromagnet or a linear motor 15 may be used. In this case, it is effective in preventing attenuation of magnetic force. In addition, when using a linear motor,
It has the advantage that the molten metal can progress smoothly. Although the arrangement is similar to that shown in FIGS. 5 and 6, it goes without saying that other arrangements may be used.

Further, in the above embodiment, the suction means uses magnetic force and has nine configurations, but the present invention is not limited to such a structure, but may be of an air suction type. Although both of the casting molds are shown as full belts, the present invention can also be implemented when one of the molds is a drum 16 and the other is a belt 17, as shown in FIGS. 9 and 10, for example. Needless to say, it is possible.

As described above, according to the present invention, the perforation of the belt for forming the mold and the adhesion to the guide portion can be improved, and product quality can be improved and belt integrity can be ensured.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention.
The figure is a vertical cross-sectional view of the central part of the main part of the water supply system, Figure 2 is a cross-sectional view taken along the line 5--■ in Figure 1, Figure 3 is a view taken in the direction of the ■ arrow in Figure 1, and Figure 4 is a characteristic showing the action. The diagrams, FIGS. 5 and 6, are diagrams corresponding to FIGS. 1 and 2, respectively, showing other embodiments of the present invention.
Figures 1 and 8 show still other embodiments.
9 and 10 are diagrams corresponding to FIGS. 1 and 2 showing further different embodiments. 2... Molten metal, 3... Pouring port, 4... Solidification path, 5.
6117... Bell), 9.10... Guide (cooling pad), 13... Small hole, 14.15... Suction means (
magnets, linear motors). Agent Patent Attorney Takahashi Meiji Condolence 3

Claims (1)

[Scope of Claims] 1. A belt-type continuous casting device in which a solidification path of a predetermined length continuous with a molten metal spout is constituted by molds that move in synchronization with each other, and at least one of the molds is an endless belt. A suction element Rt- that applies a flattening force along the width direction of the belt to the guide portion of the belt to the coagulation path.
Belt type continuous casting equipment with all the features. 2. Claim 1, characterized in that the belt is made of a magnetic material and the attraction means is a magnet or a linear motor.
The belt-type continuous casting device described in Section 1. 3. The belt type continuous casting apparatus according to claim 1, wherein the suction means is of an air suction type. 4. The belt type continuous casting apparatus according to claim 1, characterized in that a channel for cooling and belt sliding is formed between the belt and the suction means.