JPH01284474A - Plate for slide gate - Google Patents

Abstract

PURPOSE:To facilitate the removal of a plate brick and the maintenance of the flatness thereof and to enable the reuse thereof by fixing the plate brick onto which a metallic ring is fitted via mortar into a metal casing coated with a release agent on the inside surface. CONSTITUTION:The release agent 2 consisting of graphite is coated to about 50mum thickness on the inside surface of the metal case 1. The plate brick 3 which has a nozzle hole 4 in the required position and is fitted by shrinkage fitting with the metallic ring 5 consisting of a steel strip, etc., on the outside circumference thereof is fixed via an air-hardening mortar 6 into this metal case 1. The mortar 6 which consists essentially of SiO2, is set at about 2-3mm thickness and has about <=1.0mm particle size is preferable. The strain of the case 1 is then absorbed by the above-mentioned mortar 6 and the sliding plate to maintain the flatness of the sliding surface of the brick 3 is obtd. The brick 3 is easily separated and removed from the case 1 via the release agent 2 and the reuse of the plate by repairing the nozzle hole 4, etc., is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plate for a slide gate that controls the flow rate of molten metal from a ladle or tundish during continuous casting.

[Conventional technology]

Conventionally, as a plate for a slide gate, for example, the plate described in Japanese Utility Model Publication No. 52-26494 is known.

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This sliding gate plate is made by fixing plate bricks 12 in a metal case 11 through mortar 13, as shown in FIG. A plate brick 20 is housed in which a metal ring 17 made of metal ring 17 is fitted around the outer periphery, and a cushion material 18 such as asbestos and an iron plate 19 are bonded to the back side, and the plate brick 20 is fixed to the metal case 16 with a bolt or bolt 21. It is composed of

In Figures 4 and 5, 14.22 is plate brick 1.
2.20 nozzle hole.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional slide gate plates, the steel industry is aiming to increase the added value of products and reduce costs, and the recycling of plate bricks is required. Currently, I have the following problems:

In the former plate, the plate brick 12 is the mortar 13
Since the plate brick 12 is fixed to the metal case 11 through the metal case 11, when the plate brick 12 is removed from the metal case 11 in order to repair the nozzle hole 14 which has been enlarged by molten metal, the plate brick 12 may break due to cracks that occur during use. , the plate brick 12 cannot be regenerated.

In the latter plate, the plate brick 20 is fixed to the metal case 16 via a bolt or bolt 21, so it is easy to remove the plate brick 20 from the metal case 16, but due to the heat history during use, the metal case If 16 is greatly distorted, this distortion cannot be absorbed by cushion material 18, and there is a problem that the flatness of the sliding surface of plate brick 20 is impaired. As a result, strain control of the metal case 16 becomes stricter, and its lifespan is shortened.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plate for a sliding gate that allows the plate bricks to be easily removed from the metal case and maintains the flatness of the sliding surface thereof, and that enables the plate bricks to be recycled.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is such that a plate brick having a metal ring fitted around the outer periphery is fixed in a metal case whose inner surface is coated with a mold release material through mortar.

[For production]

According to the above means, the plate brick and the metal case are separated by the mold release material, and stress does not act between the plate brick and the metal case.

The mold release material is preferably one in which 20 to 50% of natural graphite is suspended in water or light oil, etc., and the coating thickness is 20 to 300 μm.
A certain amount is enough.

The mortar used is an air-hard mortar mainly composed of 5i02, and it is preferable that the particle size is f, 0 mm or less.
If the particle size exceeds 1.0 mm, the plasticity will decrease and it will be difficult to set unless a large gap is provided between the metal case and the plate brick.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a metal case, the inner surface of which is coated with a mold release material 2 made of graphite to a thickness of about 50 μm. 3 is a plate brick having a nozzle hole 4 at a predetermined position, and a metal ring 5 made of band steel or the like is fitted around the outer periphery by shrink fitting.

The plate bricks 3 are fixed inside the metal case 1 via air-hard mortar 6 mainly made of 5in2.

The gap between the metal case 1 and the plate brick 3 is preferably set so that the mortar 6 interposed therebetween has a thickness of 2 to 3+ am.

Further, the particle diameter of the mortar 6 is preferably 1.0 mm or less, and if it exceeds this, it becomes difficult to set the plate bricks in the metal case.

In the slide gate plate having the above structure, even if a large strain occurs in the metal case, the strain can be absorbed by the mortar, so that the flatness of the sliding surface of the plate brick 3 is not damaged. Therefore, the strain management of the metal case is reduced and the life of the metal case is extended.

Further, when repairing the nozzle hole 4 enlarged due to use, the plate brick 3 can be easily and neatly removed from the metal case 1 since both are separated with the mold release material 2 as a boundary.

After use, the plate brick 3 removed from the metal case 1 is inserted into a nozzle hole 4 of a required size in a hole 7 which is suitably larger than the enlarged nozzle hole, as shown in FIG.
A cylindrical regeneration ring 8 having a diameter of 1.0 is fitted through mortar (not shown) and regenerated. Like the plate brick 3', the recycled plate brick 3' has the previous mold release material 2 and mortar 6 removed, and is placed in a new mortar 6' in the metal case 1, which has been newly coated with the mold release material 2'. It is fixed through the plate and used again as a slide gate plate.

(Effects of the Invention) As described above, according to the present invention, the plate brick and the metal case are separated by the mold release material, and the plate brick can be removed easily and cleanly, so the plate can be recycled and used. I can do it. Furthermore, even if the metal case is significantly distorted, the distortion can be absorbed by the mortar, so the management of the metal case is reduced and its lifespan is extended.

[Brief explanation of the drawing]

Figures 1 and 2 are a cross-sectional view and a plan view of a plate brick for a slide gate showing one embodiment of the present invention, Figure 3 is a cross-sectional view of a recycled plate for a slide gate, and Figures 4 and 5 are
Each figure is a sectional view of a conventional slide gate plate. 1...Metal case 2...Release material 3...
Plate brick 4... Nozzle hole 5... Metal ring 6... Mortar applicant Toshiba Ceramics Corporation

Claims (1)

[Claims] (1) A plate for a slide gate, characterized in that a plate brick with a metal ring fitted around the outer periphery is fixed to a metal case whose inner surface is coated with a mold release agent through mortar.