JPH0852543A - Method for setting dummy bar in continuous casting of slab, and its dummy bar - Google Patents

Abstract

PURPOSE:To simplify the work to charge a dummy bar for continuous casting of a slab in a mold. CONSTITUTION:When a sealing material 1 is preliminarily fitted to an outer circumferential end part of a dummy bar 2 and the dummy bar 2 is charged from the upper part into a mold 3 where the clearance between the longer side and the shorter side is preliminarily set wider than that during the casting, a mechanism 6 to adjust the clearance between the dummy bar 2 and the mold 3 is set on one or more parts on the side of the head of the dummy bar at the lower part of the sealing material 1. A first mechanism of this clearance adjusting device 6 is of the inversely tapered shaped where the thickness of the upper part is increased while the thickness of the lower part is reduced, and is a projection made of the shrinkable material. The clearance adjusting device is a roller--shaped projection made of shrinkable material, and a spring mechanism is used as a supporting mechanism of this projection. This reduces the working load to charge the dummy bar for continuous casting the slab into the mold, and reduces the working time for preparing the casting work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a dummy bar in a continuous casting mold, in which a seal material previously attached to the dummy bar is surely introduced into the mold to seal a gap between the dummy bar and the mold. For reliable operation, it is used in the field of continuous slab casting.

[0002]

2. Description of the Related Art In continuous casting of a slab, it is necessary to form a new ingot at the start of casting and then perform continuous casting of the slab starting from this ingot (so-called bottommost ingot).

In order to form the bottommost cast slab, generally, after completion of continuous casting, a waiting dummy bar is charged into the mold from above or below the mold, and then molten steel is injected from the tundish to continuously cast. To start.

When loading the dummy bar into the mold, the short side of the mold is slightly smaller than a predetermined width (cast slab width + corresponding to heat shrinkage) so that the dummy bar and the short side of the mold do not come into contact with each other. Set it in a wider position, insert the dummy bar,
In order to fill the gap between the dummy bar and the mold, the work of filling the sealing material is performed.

Further, when inserting the dummy bar into the mold, the short side of the mold is set to a position sufficiently wider than a predetermined width in advance, and after inserting the dummy bar into the mold, the short side of the mold is predetermined. It may be a work procedure to set the width again.

Preparatory work for starting casting in continuous casting is a manual work (so-called peak work), and various efforts have been made to reduce the work load.

The sealing material is attached to the dummy bar in advance, and the sealing material is set not only on the short side of the mold but also on the long side of the mold in such a manner that the mutual distance is set wider than that at the time of casting. A method of compressing the mutual intervals of the short sides to the intervals at the time of casting to complete the sealing work has also been studied.
There is a technology disclosed in Japanese Laid-Open Patent Application No. -71757.

However, in the actual operation, the dummy bar normally employs a link mechanism, and it is customary that the dummy bar is inclined to either side when the dummy bar is loaded from above.

Therefore, in the conventional technique typified by Japanese Patent Application Laid-Open No. 4-71757, when the dummy bar is loaded into the mold, the dummy bar is inclined to one side and the distance between the dummy bar and the one mold becomes small, so that the dummy bar The sealing material attached to the upper part comes into contact with the upper end of the mold and is stripped off.

In order to prevent this, in the past, a person had to insert the dummy bar while centering it with a bar or the like. Therefore, at least one worker is required to insert the dummy bar into the mold. This is an obstacle to automation and labor saving.

[0011]

In the prior art, by mounting the sealing material on the dummy bar in advance, it becomes possible to omit the mounting of the sealing material after the dummy bar is loaded or the operation of embedding it in the gap. However, when loading the dummy bar into the mold, the dummy bar tilts to one side and the gap between the mold and one of the molds becomes smaller, and the sealing material attached to the upper part of the dummy bar comes into contact with the upper end of the mold and is stripped off. Become.

In order to prevent this, in the past, a person had to insert the dummy bar while centering the dummy bar with a bar or the like. Therefore, at least one worker is required to insert the dummy bar into the mold. This is an obstacle to automation and labor saving, and it was necessary to solve this.

The present invention provides a dummy bar setting method and a dummy bar for simplifying the work of loading a slab continuous casting dummy bar into a mold.

[0014]

The present invention has been made to solve the above-mentioned problems relating to the dummy bar charging operation at the time of preparation for starting continuous casting.

According to the method of setting a dummy bar of the present invention, when the dummy bar is charged into the slab continuous casting mold from above, a sealing material is previously attached to the outer peripheral end of the dummy bar,
A protrusion for adjusting the gap between the dummy bar and the mold is provided on the lower outer peripheral surface, and the dummy bar is set from above in the mold in which the distance between the long side and the short side of the mold is set wider than that at the time of casting in advance. Characterized by charging
This is a dummy bar setting method in slab continuous casting.

The dummy bar of the present invention is a dummy bar that is inserted into the mold from above at the start of continuous casting of the slab, and at least on one side of the outer peripheral surface of the long side of the dummy bar.
It is a dummy bar in slab continuous casting, characterized in that the thickness of the lowermost portion is thinner than that of the uppermost portion, and one or more projections made of a material that is compressible are installed at one or more places.

The second dummy bar of the present invention is a dummy bar which is charged into the mold from above at the start of continuous casting of the slab, and has a compressibility at least on one side of the outer peripheral surface of the long side of the dummy bar. 1 roller-shaped projection made of material
This is a dummy bar in continuous slab casting characterized by being installed in more than one place.

A third dummy bar of the present invention is a dummy bar in continuous slab casting, characterized in that a spring is interposed between the protrusion and the roller-like protrusion and the dummy bar main body.

[0019]

That is, according to the present invention, a mechanism for adjusting the gap between the dummy bar and the mold is provided below the sealing material of the dummy bar, whereby the dummy bar is automatically centered and the sealing material is prevented from being peeled off. As a result, it is possible to eliminate labor for the worker to perform centering with a crowbar or the like and achieve labor saving at the same time.

As a device for adjusting the gap between the dummy bar and the mold, a projection having a reverse taper shape with a thick upper portion and a thin lower portion and using a compressible material,
The dummy bar is automatically centered by installing it on one or more sides of the dummy bar.

As a device for adjusting the gap between the dummy bar and the mold, even if one or more roller-shaped projections made of a compressible material are installed on the side surface of the dummy bar, the dummy bar is automatically centered and at the same time. It is possible to prevent defects on the copper plate.

By adopting a spring mechanism as the supporting mechanism for the above-mentioned roller-shaped projections, the clearance between the projections and the mold and the crimping force can be adjusted, so that the dummy bar can be centered more reliably.

As described above, an appropriate mechanism for adjusting the gap between the dummy bar and the mold is provided below the sealing material of the dummy bar, whereby the dummy bar is automatically centered and the sealing material is prevented from being peeled off. As a result, labor saving can be achieved at the same time by eliminating the work for the worker to perform centering with a bar or the like.

[0024]

The present invention will be described more specifically with reference to the drawings.

FIGS. 1, 2 and 3 are sectional views showing a process of loading a dummy bar into a mold by a conventional method which does not use the gap adjusting device of the present invention.

FIGS. 4 and 5 are sectional views showing the process of loading the dummy bar into the mold when the first gap adjusting device of the present invention is used. FIG. 6 shows AA in FIG.
It is an arrow view.

FIG. 7 is a sectional view showing a state in which the dummy bar has entered the mold when the second gap adjusting device of the present invention is used. FIG. 8 is a cross-sectional view showing a state in which the dummy bar has entered the mold when the third gap adjusting device of the present invention is used.

As shown in FIG. 1, the dummy bar 2 to which the seal material 1 is attached in advance is loaded into the mold 3. At this time, since the dummy bar 2 has the link mechanism 4, it normally tilts in either direction.

Therefore, if the charging of the dummy bar 2 is continued in this state, the state as shown in FIG.
The sealing material 1 is caught at the upper end portion of the mold 3 and is peeled off.

Therefore, conventionally, as shown in FIG. 3, a procedure has been adopted in which a worker uses the burl 5 or a jig similar thereto to raise the dummy bar 2 and center it so that the dummy bar 2 is inserted into the mold 3.

Therefore, as shown in FIG. 4, the dummy bar 2
Below the sealing material 1 is the dummy bar 2 in which the gap adjusting device 6 of the present invention having an inverse tapered shape is mounted.

With such a structure, as shown in FIG. 5, when the dummy bar 2 is inserted into the mold 3, the gap adjusting device 6 is centered and the sealing material 1 is not peeled off. You will be guided within 3.

The dummy bar 2 is set at a predetermined position in the mold 3, and the mold is clamped by the mold clamping devices 9a and 9b so that the mold is narrowed to a predetermined distance, thereby completing the sealing at the same time.

Since the gap adjusting device 6 is a contractible material, it will not be crushed by reducing the mold to a predetermined thickness and will not adversely affect the sealing performance of the upper part of the dummy bar 2.

Therefore, unlike the prior art, the work of raising the dummy bar 2 by the burl 5 is not necessary, so that labor saving and automation can be achieved at the same time.

As shown in FIG. 6, the gap adjusting device 6 needs to be installed at one or more places on one side of the wide surface of the dummy bar, and is usually installed at one or two places.

Further, normally, as shown in FIG. 4, the dummy bar 2 is installed evenly on both sides of the wide surface side, but there is a characteristic such as the shape of the dummy bar 2 and it always tilts in only one direction. If so, it is possible to install the dummy bar 2 only on one side of the wide side.

Further, as the material of the gap adjusting device 6, fireproof paper is usually used, but it is not particularly limited as long as it is a material that is contractible and does not damage the mold 3.

It is also possible to use a roller-shaped gap adjusting device 7 as shown in FIG. 7 as the second gap adjusting device. In this case, it is necessary to use a material such as a hardened rubber which is contractible and does not damage the mold 3 as the material of the roller.

As the third clearance adjusting device, a spring mechanism 8 may be installed behind the rollers as shown in FIG. 8 to absorb the rattling.

When the dummy bar of the present invention is used, in the prior art, one skilled worker is required to monitor the loading of the dummy bar and to raise the dummy bar with a bar when the dummy bar is tilted. However, when the dummy bar of the present invention is used, no special worker is required for this work.

Further, in the prior art, it was necessary to take care not to damage the mold with the dummy bar or peel off the sealing material. Therefore, when the dummy bar head enters the mold, the charging speed of the dummy bar should be lowered to a very low speed and carefully. Although the work was performed, in the case of the present invention, since it is not necessary to particularly reduce the dummy bar charging speed, the time required for charging the dummy bar is shortened and the work is simplified.

[0043]

As described above, according to the present invention, in the work of loading the dummy bar into the continuous casting mold from above, a sealing material is previously attached to the outer peripheral end of the dummy bar, and the dummy bar is used as the mold. When loading from above into a mold that is set so that the long side and the short side of each other are wider than in the case of casting, a mechanism to adjust the gap between the dummy bar and the mold should be provided below the sealing material of the dummy bar. This eliminates the need for monitoring the dummy bar loading and the work of raising the dummy bar with a bar when the dummy bar is tilted, which is required in the conventional technology, and simplifies the work, and requires no skill to load the dummy bar. Became shorter.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a process of inserting a dummy bar when the gap adjusting device of the present invention is not used.

FIG. 2 is an explanatory view showing a process of inserting a dummy bar when the gap adjusting device of the present invention is not used.

FIG. 3 is an explanatory view showing a process of inserting a dummy bar when the gap adjusting device of the present invention is not used.

FIG. 4 is an explanatory view showing a first gap adjusting device of the present invention and a process of inserting a dummy bar when the device is used.

FIG. 5 is an explanatory view showing a first gap adjusting device of the present invention and a process of inserting a dummy bar when the device is used.

FIG. 6 is an explanatory view showing a first gap adjusting device of the present invention and a process of inserting a dummy bar when the device is used.

FIG. 7 is an explanatory diagram showing a second gap adjusting device of the present invention and a process of charging a dummy bar when the device is used.

FIG. 8 is an explanatory diagram showing a third gap adjusting device of the present invention and a process of charging a dummy bar when the device is used.

[Explanation of symbols]

 1 Sealing Material 2 Dummy Bar 3 Mold (Long Side) 4 Link Mechanism 5 Bar 6 Gap Adjuster 7 Roller Type Gap Adjuster 8 Spring Mechanism Type Gap Adjuster 9a Mold Clamping Device 9b Mold Clamping Device 10 Mold (Short Side) 11a Short side mold driving device 11b Short side mold driving device

Claims (4)

[Claims] 1. When loading a dummy bar into a slab continuous casting mold from above, a seal material is previously attached to the outer peripheral end of the dummy bar, and a gap between the dummy bar and the mold is provided on the lower outer peripheral surface thereof. Providing a protrusion for adjusting the mold, characterized in that this dummy bar is inserted from above into the mold set with the interval between the long side and the short side of the mold wider than that during casting in advance, in slab continuous casting How to set the dummy bar. 2. A dummy bar which is loaded into a mold from above at the start of continuous casting of a slab, and at least one side of the outer peripheral surface of the long side of the dummy bar has a lowermost part having a thickness smaller than that of the upper part and contractible. A dummy bar for continuous slab casting, characterized by having one or more protrusions made of flexible material. 3. A dummy bar which is inserted into a mold from above at the start of continuous casting of a slab, and at least one side of the outer peripheral surface on the long side of the dummy bar is provided with a roller-like projection made of a compressible material. A dummy bar in continuous slab casting characterized by being installed in more than one place. 4. The dummy bar in continuous slab casting according to claim 2, wherein a spring is interposed between the protrusion and the dummy bar body.