JPS62212041A - Short side mold for continuous casting of thin slabs - Google Patents

Abstract

PURPOSE:To prevent occurrence of a constrained breakout by friction with a thin casting slab, by arranging a plate having good lubricity and heat conductivity between the upper heat resistance body and the lower cooling plate of a short side mold in the thin casting slab continuous casting by the facing running cooling body. CONSTITUTION:In the short side molds 4, 5 in the thin casting slab continuous casting by pairs of endless cooling belts 1, 2 and cooling rolls, the plate 11 having good lubricity and heat conductivity, such as carbon brick, oil impregnation sintering alloy, boron nitride, etc., is arranged between the upper heat resistance body 9 and the lower cooling plate 10. The shells developed at the both end parts of the casting slab are smoothly grown, and as the friction with the wall face is little, the casting slab is cast continuously without occurrence of the constrained breakout, and the casting operation is executed safely and smoothly and the quality of the products is improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a mold for continuous casting of thin slabs;
In particular, it relates to a short-side mold for continuous casting of thin slabs.

(Prior Art) Conventionally, as a continuous casting machine for thin casting H, there are machines using six types using a pair of endless belts and a pair of rolls.

Figure 2 shows a 1ltJ-type young spindle continuous casting machine.

This A continuous slab casting machine has a plurality of 1M guide rolls 3a.
, 3b, 3c, 3a', 3b', 3c' The pair of endless belts 1.2 constitute the long side surface of verse 1-, and the endless belt is cooled on the back side of the endless belt.・Supporting belt cold lll5! Place 8
is set up. Further, near the side edges of the endless belt 1.2, a pair of short side molds 4, 5 are provided which are in close contact with the endless belt 1.2.
2 and the short side mold 4°5 form a casting space. Molten steel is injected into this casting space through an injection nozzle 6, and a thin slab 7 is pulled out from the lower end of the endless belt 1.2.

In addition, an 8vJ piece continuous casting machine of the type to be reviewed is shown in Fig. 3. This monthly continuous casting machine consists of a pair of rotating rolls 8 and a pair of short side molds 4.5 that are in close contact with the rolls near the side edges of the rolls.

Molten steel is injected into the casting space formed by the pair of rolls 8 and the pair of short-side molds 4.5 through an injection nozzle 6, and a thin slab 7 is taken out from the lower end of the rolls.

The short side mold of each thin slab continuous casting machine is approximately 30mm in diameter, considering that the diameter of the injection nozzle is approximately 100mm or more.
In order to cast a thin slab of +, it has a so-called tapered shape, which is wide at the top and narrows toward the bottom to a constant width, as shown in FIG. In addition, in order to prevent the slab from becoming unhandable due to the development of a solidified shell, a heat insulator 9 is installed at the top of the short-side mold, and a heat insulator 9 is installed at the lower part of the mold with a constant width to promote solidification. A cooling plate 10 is provided.

(Problems to be Solved by the Invention) However, in the short-side molds of these continuous thin slab casting machines, a restraining breakout occurs due to frictional force acting between the wall surface of the short-side mold and the slab. It was born.

The object of the present invention is to provide a short side mold for a continuous caster for book casting, which can prevent the above-mentioned restrictive breakout.

(Means for solving the problem) In order to solve the above-mentioned problem, as shown in FIG. Lubricity and heat transfer between: Board 1 with good susceptibility
1 is a feature of the present invention.

Examples of materials with good thermal conductivity and lubricity include carbon bricks, oil-impregnated sintered alloys, and boron nitride.

(Function) The plate provided between the heat insulator at the top of the short side mold and the cooling plate at the bottom of the thin slab continuous casting machine of the present invention prevents the frictional force between the slab and the short side mold wall surface from being reduced and provides restraint. Good lubricity is required to prevent breakout. Further, since the thermal conductivity of the heat insulator and the cooling plate 10 are significantly different, it is necessary to use an intermediate thermally conductive material between them.

In order to satisfy the above conditions, carbon bricks, oil-impregnated sintered alloys, boron nitride, etc. may be used.

(Example) As the n1 side mold of the thin slab passing vj machine shown in Fig. 2,
Casting was performed using the short side mold shown in FIG. The material between the upper heat insulator 9 and the lower cooling plate 10 of this short side mold is boron nitride, and the width of the side in contact with the insulator is 3.
Plate 11 with a width of 1 mm and a width of 30 mm on the side in contact with the cooling plate 10
has been established.

As a result, as shown in FIG. 5, no restrictive breakout occurred.

<Effects of the Invention> As explained above, according to the present invention, there is no restrictive breakout.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a short side mold of the present invention, FIG. 2 is a one-piece continuous casting machine using an endless belt, and FIG. 3 is a continuous casting machine for thin slabs using rolls. FIG. 4 is a diagram showing a conventional short side mold. FIG. 5 is a diagram comparing the effects of the present invention and the conventional method. 1.2...Endless belt 3a-3c'...Guide roll・1,5...Short side mold 6...Injection nozzle 7・
...Thin cast piece 8...Belt cooling device 9...
・Insulator 10...Cooling plate 11...Plate with good lubricity and thermal conductivity Patent applicant: Kawasaki Steel Corporation Same applicant: Hitachi, Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a short-side mold for continuous casting of thin slabs with a tapered shape that is placed near the side edges of a pair of rotating bodies and has a heat insulator on the top and a cooling plate on the bottom, lubrication is applied between the heat insulator and the cooling plate. A short side mold for continuous casting of thin slabs, characterized by being provided with a plate having good properties and thermal conductivity.