JPS59153552A - Horizontal continuous casting equipment of thin walled billet - Google Patents

Abstract

PURPOSE:To reduce considerably a maintenance cost and to prevent breakout by forming passages for cooling water in a pair of right and left supporting and cooling members which cool both sides of the unsolidified billet on both sides of a pair of upper and lower endless belts and pasting seizure preventive plates on the surface that contact with the billet. CONSTITUTION:The molten steel cast between upper and lower endless belts 5 from a nozzle 2 is cooled at the top and bottom surfaces thereof by the belts 5, and both side faces are cooled by right and left supporting and cooling members 11, by which the molten steel is made into an unsolidified billet 12. The billet 12 cast in such a way is drawn in synchronization with the belts 5. The billet 12 is smoothly slid by the self-lubricating function possessed by seizure preventive plates 14, by which the generation of a seizure phenomenon is prevented and the breakout is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal continuous casting apparatus for thin-walled slabs.

In recent years, attempts have been made to cast thin slabs of about 10 to 50 yards using horizontal continuous casting equipment. According to this equipment, thin-walled slabs can be obtained directly without going through the rolling process, so the production time for slabs is shortened to 1], and rolling equipment (IFI) is not required, so it is possible to directly obtain thin slabs without going through the rolling process. Various advantages are provided, such as reduced costs.

Conventionally, the above-mentioned horizontal continuous casting apparatus has one type, for example, JP-A No. 5
There is one disclosed in Japanese Patent No. 6-62659.

This horizontal continuous casting apparatus will be explained with reference to FIG.

In Fig. 1, l is a tundish, 2 is a nozzle horizontally fixed to the lower part of the side wall of the tandish 1, and 3.3'
(d) A pair of upper rolls 4.4' are provided at a distance in front of the nozzle 2, and a pair of upper rolls 4.4' are located below the pair of upper rolls 3.3'.
A pair of lower rolls are provided facing these rolls 3 and 3' with a slight distance between them.

, 5 is a pair of upper rolls 3, 3' and a pair of lower rolls 4°4
' , a cooling box 6 as a cooling means for cooling the endless belt 5, a cylinder 7 for maintaining a constant tension of the endless belt 5, a pinch roller 8, and 9 is a guide roller.

The molten steel injected from the ladle 10 into the tamp tube l is passed through the nozzle 2 to the upper rolls 3, 3' and the lower rolls 4, 4'.
Therefore, it is cast between the upper and lower endless belts 50 that are moving in the same direction. The molten steel poured between the endless belts 5 is immediately cooled to form unsolidified slabs 12. This unsolidified slab 12 is.

It is pulled out horizontally in synchronization with the endless belt 5 while being pinched by the endless belt 5, and finally a thin slab is cast.

In the horizontal continuous casting apparatus described above, both sides of the unsolidified slab 12 moved by the endless belt 5 are as follows.

A pair of left and right sandwiched endless belts (not shown) are installed on both sides of the endless belt as supporting cooling members.

As a result, both sides 1al1 of the unsolidified slab 12 are supported and cooled.

However, when casting an unsolidified slab with a wall thickness of 50 aa or less, the width of the left and right endless belts that can support and cool both sides of the slab is also narrow.

It is difficult to make the left and right endless belts have a structure that has an excellent cooling effect. For this reason, the wall thickness of the solidified shell on both sides of the unsolidified slab 12 immediately after exiting the nozzle 2 is sufficient to meet the JS standard.
”-<Not formed, or the left and right endless belts and the unsolidified slab 12 are seized.

It was causing a breakout.

From the above-mentioned viewpoints, the present invention provides a horizontal method for thin-walled slabs that has a pair of left and right support cooling members that can sufficiently cool both sides of the unsolidified slab and prevent seizure of the solidified shell. A continuous casting device is provided.

A pair of upper rolls are provided at a distance in front of a nozzle horizontally fixed to the lower part of the side wall of the tundish, and a pair of upper rolls are provided below the pair of upper rolls and facing these rolls with a slight distance between them. a pair of lower rolls, a pair of upper and lower endless belts respectively wound around the pair of upper rolls and the pair of lower rolls, cooling means for cooling the endless belts, and both sides of the pair of upper and lower endless belts. 1 was appointed. Supports and cools both sides of the unsolidified slab. It has a pair of left and right support cooling members.

In the horizontal continuous casting apparatus for thin-walled cast slabs, a cooling water passage is formed inside the pair of left and right supporting cooling members;
It is characterized by having a self-lubricating scorching prevention plate attached to the inner surface of the lj, which comes into contact with the unsolidified slab.

One embodiment of this invention will be explained with reference to the drawings. FIG. 2 is a front view of essential parts of one embodiment of this invention, and FIG. 3 is a
FIG. 2 is a view taken along arrow A in FIG. 2;

As shown in FIGS. 21 and 3, the horizontal continuous casting apparatus of the present invention has a pair of left and right support cooling members 11 for supporting and cooling both sides of an unsolidified slab, and a cooling water passage therein. 13 is formed, and a self-lubricating anti-seizure plate 14 is attached to the inner surface of the side that contacts the unsolidified slab 12. It is a structure.

The support cooling member 11 has a cooling water passage 13 formed therein, so that the cooling water from the water supply port 15a can be discharged from the drain port 15b through the passage 13. This prevents the temperature of the support cooling member 11 from rising.

The baked VJ earthen plate 4 attached to the inner surface of the support cooling member 11 is made of a so-called cerment-based material, which is a high melting point metal eutectoided with graphite, molybdenum disulfide, boron nitride, etc., and has a thickness of 1. It is composed of a thin plate with a thickness of .oms or less, and has both a function of preventing burning of the solidified shell and a self-lubricating function due to the combined effect of a high melting point metal and a eutectoid.

The support cooling member 11 is attached to the holding device 1'' via the presser plate 16.
7 supports both sides of the unsolidified slab 12 at predetermined intervals,
The spacing between the supporting cooling members 110 can be freely adjusted according to the width dimension of the unsolidified slab] 2.

The molten steel poured from the nozzle 2 between the upper and lower endless bells l- and 5 is cooled on its upper and lower surfaces by the upper and lower endless belts 5, and is cooled on both sides (1111) by the left and right support cooling members 11 to form unsolidified cast steel. This will be piece 12.

The unsolidified slab 12 cast in this manner is continuously pulled out from the nozzle 2 in synchronization with the upper and lower endless belts 5. At this time, the unsolidified slab 12 in scraping contact with the anti-seizure plate 14 of the support cooling section 1'], 1 smoothly slides on the anti-seizure plate 14 due to the self-lubricating function of the anti-seizure plate 14, thereby preventing seizure. No phenomenon occurs. Therefore, no breakout will occur.

By simply providing a predetermined length of the support cooling member 11 near the exit side of the nozzle 2, a sufficiently thick solidified shell can be formed on both gIl1 surfaces of the unsolidified slab 12.

As explained above, according to the present invention, the thickness of the solidified shell on the image side of the unsolidified slab immediately after exiting the nozzle can be formed sufficiently thick with a simple side support structure, and furthermore, Since shell seizure can be prevented, equipment maintenance costs can be significantly reduced, and
This brings about the useful effect of being able to prevent the occurrence of breakouts.

[Brief explanation of the drawing]

Figure 1 is a schematic front view of a conventional horizontal continuous casting device,
The figure is a schematic front view of essential parts of one embodiment of the present invention, and FIG.
FIG. 2 is a view taken along arrow A in FIG. 2; In the drawing - 1... Tandish 2. Nozzle 3. 3' Upper roll 4, 4' Lower roll 5 - Endless belt 6. Cooling box 7. Cylinder 8. Pinch roller 9.. Guide roller 10. Ladle work. 1. Support cooling member ] 2. Unsolidified slab 13
・Cooling water passage 4・Seizure prevention plate 15a ・Water supply port 15b ・Drainage [16 ・Press plate
17 - Holding device applicant Natsuo Shiotani (and 2 others) Agent of Nippon Kokan Co., Ltd. 265 Figure 1 Arrow Figures 2 and 3

Claims (1)

[Claims] A pair of upper rolls are provided at a distance in front of a nozzle horizontally fixed to the lower part of the side wall of the tanditshu, and below the pair of upper rolls there is a slight space between these rolls. a pair of lower rolls facing each other with a gap between them, a pair of upper and lower endless belts respectively wound around the pair of upper rolls and the pair of lower rolls, a cooling means for cooling the endless belts, and a cooling means for cooling the endless belts; Fixed on both sides of a pair of endless belts. Supports and cools both sides of the unsolidified slab. In a horizontal continuous casting device for thin-walled slabs having a pair of left and right supporting cooling members, the pair of left and right supporting cooling members have cooling water passages formed therein and come into contact with the unsolidified slab. It is characterized by having a self-lubricating anti-seizure plate pasted on the inner surface of the side. Horizontal continuous casting equipment for thin slabs.