JPH028591Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a heat insulating device installed in continuous casting equipment, particularly for continuous casting equipment that allows the crater end to be positioned at a predetermined position regardless of the casting speed. This relates to a heat insulating device installed in a slow cooling zone.

[Conventional technology]

An outline of a conventional continuous casting facility using a mold with both ends open will be explained with reference to FIG.

Molten steel injected from a ladle 1 into a tundish 2 is injected into a mold 4 via a nozzle 3. The molten steel in the mold 4 is cooled by guide rolls 5 and a secondary cooling zone 6 provided following the mold 4 and is drawn downward. The unsolidified slab, which has been cooled and a solidified shell has gradually become thicker, is straightened horizontally by a straightening roll 7. After that, the slab 9, which has been completely solidified in an annealing zone 8, is transferred to a cutting machine 10. The material is cut into a predetermined length by a machine and sent to the next process.

In recent years, as part of energy-saving measures, so-called hot direct rolling, in which slabs cast by continuous casting equipment are conveyed to the rolling process and rolled without being reheated, is being carried out. Continuous casting equipment has been proposed in which a heat insulating device is installed between adjacent pinch rolls to prevent a drop in the temperature of the slab and obtain high-temperature slabs. Some of them are disclosed in the official gazette, Japanese Utility Model Publication No. 10443/1983, etc.

[The problem that the idea aims to solve]

However, when continuous casting is performed with the conventional heat insulating device as described above installed, the following problems occur.

In order to keep the productivity of the slab 9 constant, it is necessary to change the casting speed (slab drawing speed) according to the slab size, but when the casting speed changes, the position of the crater end 20 also changes. That is, when the casting speed is increased, the crater end moves in the slab drawing direction, and when it is slowed down, the crater end moves in the opposite direction. In order to obtain a high temperature slab, the crater end 20 is cut by a gas cutting machine 10.
It is necessary to control the cooling of the slab 9 over a wide range so that it is positioned immediately before the

However, the conventional heat insulating device described above only has the effect of insulating the slab, so when the casting speed is increased, excessive cooling must be performed in the limited length of the secondary cooling zone. There was a problem that the quality of slabs was adversely affected.

[Means to solve the problem]

This invention was made to solve the above problem, and is a heat insulating device installed in the slow cooling zone after the secondary cooling zone of continuous casting equipment, and the heat insulating material is covered with an outer plate. a heat-insulating plate having a corrugated shape attached to one side of the heat-insulating plate; an air layer formed between the heat-insulating plate and the heat-reflecting plate; It consists of a cooling water pipe attached to a heat reflecting plate so that its tip is open, thereby giving the heat insulating device a cooling function.

〔Example〕

An embodiment of this invention will be described with reference to the drawings.

FIG. 2 is a partially cutaway perspective view of one embodiment of this invention.

In FIG. 2, reference numeral 11 denotes a heat insulating board, which is made by covering a heat insulating material 12 such as glass fiber with an outer plate 13 such as an iron plate. A heat reflecting plate 14 is partially fixed to one surface of the heat insulating plate 11, and is made of a thin stainless steel plate formed into a corrugated shape to absorb thermal expansion. Reference numeral 15 designates a plurality of cooling water pipes that are fixed perpendicularly to the heat insulating plate 11 such that they penetrate through the heat insulating plate 11 and open their tips to the heat reflecting plate 14 . Cooling water can be spouted from the cooling water piping 15 by attaching a wide-angle nozzle tip to the tip of the piping and spraying the atomized material onto the slab, or by spraying water or other gas such as air in the middle of the piping. A mist cooling method in which the mixture is forcibly mixed and atomized is sprayed from a nozzle tip attached to the tip of the piping, or cooling water is jetted directly from the piping 15 in a laminar flow state to form a laminar flow film on the surface of the slab for cooling. There are laminar flow cooling methods, etc., but which method to adopt should be decided by considering the necessary cooling control range of the slab and ensuring uniform cooling performance.

The radiant heat radiated from the slab 9 is transferred to the heat reflecting plate 14.
A part of it is reflected by the heat reflecting plate 1.
As a result of being insulated by the air layer 16 formed between the slab 9 and the insulation plate 11 and the insulation plate 11, the slab 9
temperature will be maintained uniformly.

Therefore, as shown in FIG. 3, if the heat insulating device according to this invention having the above-mentioned configuration is installed between adjacent pinch rolls 17 of the slow cooling zone, the temperature of the slab 9 can be prevented from decreasing. can be obtained. As shown in FIG. 4, if another heat insulating member 18 is attached to the frame 19 of the pinch roll 17 close to both sides of the slab 9, heat dissipation from both sides of the slab 9 can be prevented. Therefore, the slab 9 can be maintained at a higher temperature and more uniformly.

On the other hand, when the casting speed is increased, the crater end 20 moves in the slab drawing direction, and the crater end 20 is no longer located in the slow cooling zone only by secondary cooling control within a range that does not adversely affect the quality of the slab. In this case, the cooling water is discharged from the cooling water pipe 15 toward the slab 9 in a predetermined range at the front of the slow cooling zone. As a result, the slab 9 is forcibly cooled in a predetermined range at the front of the slow cooling zone, so that the crater end 20 can be returned to the position before the casting speed change.

In other words, even if the casting speed changes, the slab cooling capacity can be controlled over a wide range from the secondary cooling zone to the slow cooling zone, so the position of the crater end can be controlled without deteriorating the slab properties. It becomes possible to do so. Furthermore, by insulating a predetermined area in the latter half of the slow cooling zone near the crater end, it is possible to maintain the temperature of the slab after extraction at a substantially constant level.

[Effect of idea]

As explained above, according to this invention, it is possible to prevent the temperature of the slab from decreasing in the slow cooling zone after the secondary cooling zone, and the crater end of the slab can be prevented due to factors such as increasing the casting speed. Even if there is a risk of leaving the slow cooling zone, forced cooling can be performed in the entire slow cooling zone or a part of the slow cooling zone, so there is no need to perform excessive cooling in the secondary cooling zone. Therefore, an extremely useful effect is brought about, such as being able to consistently obtain high-temperature slabs of excellent quality regardless of the casting speed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of conventional continuous casting equipment;
The figure is a partially cutaway perspective view showing one embodiment of this invention, FIG. 3 is a side view showing the heat insulation device of this invention installed in the cooling zone of continuous casting equipment, and It is a sectional view taken along the line AA in the figure. In the drawings: 1...Ladle, 2...Tundish, 3...Nozzle, 4...Mold, 5...Guide roll, 6...2
Next cooling zone, 7... Straightening roll, 8... Gradual cooling zone, 9
... Slab, 10 ... Cutting machine, 11 ... Heat insulation plate, 1
2...Insulating material, 13...Outer plate, 14...Heat reflecting plate, 15...Cooling water piping, 16...Air layer, 1
7...Pinch roll, 18...Insulating member, 19...
...Frame, 20...Crater End.

Claims (1)

[Scope of utility model registration request] A heat insulating device installed in the slow cooling zone after the secondary cooling zone of continuous casting equipment, which comprises a heat insulating board made of a heat insulating material covered with an outer plate, and a corrugated shape attached to one side of the heat insulating board. a heat reflecting plate, an air layer formed between the heat insulating plate and the heat insulating reflector, and a cooling water pipe that penetrates the heat insulating plate and is installed so that its tip opens at the heat reflector. A heat insulating device installed in continuous casting equipment, characterized in that the heat insulating device is provided with a cooling function.