JPS583754A - Preventing method for thermal fatigue in meniscus part of mold for continuous casting - Google Patents

Abstract

PURPOSE:To prevent the cracking of mold bodies owing to their thermal fatigue and to extend the life of the molds in the stage of connecting the mold bodies and back frames by means of lock bolts by fitting the tie bolts loosely into bolt insertion holes. CONSTITUTION:When molten steel of high temps. contacts with the inside surface of the long side parts 2 of molds, the long side parts (more particularly, meniscus parts) of the molds expand. When the inside surfaces of the parts 2 are cooled by the drop of the level of the molten steel coupled by the effect of cooling with cooling water, said parts shrink. Since tie bolts 5 fixing back frames 1 and the mold bodies 2 are fitted loosely in insertion holes for tie bolts, the expansion and contraction of the parts 2 in accordance with their heating and cooling are not restricted at all and the bolts 5 are fixed to have no looseness only in their axial line direction by the elastic forces of belleville springs 9.

Description

[Detailed description of the invention] Thermal fatigue W prevention of meniscus part of zero-start @ reliable continuous casting layer mold 2
This is related to the F method.

- Continuous casting device W is of a type in which a 1III cast gourd body is supported by a #I pack frame from the back of the bone, - The lid body and pack frame are formed by numerous casting ports. It is strongly connected to cV%. Therefore, during operation, the main body of the cast iron is heated by the sea bream, and even if you try to do it, it will be restrained by the pack flame and you will be free! Unable to form and layered**
This results in the occurrence of That S Totsugu Yuda lowered the above ma
When the w-shaped part is cooled, the neck is placed in the 11 part.
6 forces work (this happens. The above behavior is repeated and 1%
During this process, the inner meniscus of the mold becomes fatigued and cracks occur at the Al1 portion, shortening the life of the mold.

The present invention 1 relates to a method for solving the above-mentioned drawbacks, and its main points w
When connecting the pack frame and the casting body with the tightening port, there must be an O-ring 4 between the tightening bolt part and the pack frame! A method for fixing fat due to thermal fatigue at the meniscus of a mold for continuous casting by using a fitted O-ring holder and a disc spring, and also by loosely fitting a casting bolt into a quick-through hole for a 11-tightening bolt. It is.

While referring to -m to 9 below, this nuclear power plant, on the other hand, 9: 1 group missed.

Figure 111 shows the Snx circle for continuous casting equipment, (1) the Ken-pack frame, (3) the length of the body of the casting body of the sea bream or the sea bream pot Kinmei, (3) is the equivalence side, and the short side is Department line length g11
It is hidden inside the thin turret. (4) , (4)...
...This is a far hole for the bolt. Figure 2 shows an actual example in which the long if part of the mold described above and the pack frame are fixed with a tightening bolt (broom), and (6) is a bolt installed inside the pack frame. This is the cooling water S channel. (
7) is an O-ring, (1) is a go-ring umbrella rudder, (1) is a Nipane, and the Yupane has a high outer side.
! Gives power to c7 and moves. In addition, it shows other actual criticisms of the thermal fatigue prevention mechanism of the mold, (10
) is the life between the pack frame and O-ring umbrella rule.
This is a sea bream patsukin.

According to the present invention related to am as described above, when the high temperature sea bream comes into contact with the long side part 8 of the mold, when the long side of the casting country (the meniscus part) is fixed, and when the first Wi direction grim0
Next -'e- When the level of the sea bream decreases, and the inner surface of the long side of the cast mackerel is reduced to 1 due to the action of the cooling part by 1kIIIJ water, the sea bream is taken in the direction of the arrow B in Figure 1. . That is, in the method of the present invention, the pack frame and the mold body are heated in a II kiln, and the Isumi casting bolt is loosely fitted into the tightening bolt Shinto hole.
hlzWゞ・52"0 heating 1"5"4511II
The tightening bolt will not be loosened in the axial direction due to the elastic force of the clamp.
It will be fixed like this. Due to the action of the O-ring and/or packing, 1) the cooling water passes through the hole of the tightening bolt and vibrates; 4) it stops.

In addition, Figure 184 shows the tightening bolt Shinto hole gradually lengthening from the center of the pack frame toward both outside sides (this is a long hole shape with the center eccentric), and this fourth
According to the T-type product shown in WJ, it is possible to solve the problem that the displacement amount due to expansion and contraction of the long side of the mold becomes larger as the size increases as the size increases as the size of the shaft increases as the size increases as the size of the shaft increases.

As mentioned above, how to expose the original application II! According to the above, since the long side portion can be more freely expanded and thinned due to heating and cooling, it is possible to prevent the mold body from warping due to -aS, and the life of the mold can be extended. ×: Since the tightening force is adjusted to a constant Iz by the leg spring, the attachment can be controlled accurately.

[Brief explanation of drawings]

Figure 1 is a perspective view of Casting II used in the method of the present invention.
Fig. 3 is an explanatory diagram showing the installation state of the bone tightening port, and the 411m bolt holding hole is an elongated hole. Educational bet number 1! ! I - Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. When connecting the pack frame and the control body with the cast port, insert an O-ring holder with an O-ring and a disc spring between the cast port and the pack frame, and also use the tightening port. Foundry meniscus S for continuous casting, which has a loose fit in the Shinto hole of the bolt.
How to stop suffering from fatigue.