JPH04251709A - Method for forming firebrick provided with recessed section on its side face - Google Patents

Abstract

PURPOSE:To manufacture easily a firebrick provided with a recessed section on its side face by sticking a magnetic body having the shape and size corresponding to the recessed section to be formed preliminarily in the give position of the inner face of a molding frame composed of a ferromagnetic material and filling a refractory raw material in the mold and pressurizing. CONSTITUTION:A base 3 to which a core 4 is fitted for forming an inner bore face on a central section is disposed in a steel frame main body 2 for molding. Also a recessed section forming component 5 for forming a recessed section for installing a gas introduction tube on the side face of a porous firebrick to be manufactured is installed on the inner face of a mold main body 2. The recessed section forming component 5 is a ferromagnetic body, and installed by magnetic force on the given position upper than a recessed section 6 for installing the gas introduction tube formed eventually. Body 7 composed of a refractory raw material such as alumina is filled in a mold thus constituted, and a desired porous brick molded body 9 with a recessed section 10 for installing a gas introduction tube formed on its side section is manufactured by pushing an upper frame forcibly.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a refractory brick, such as a nozzle brick used for blowing stirring gas into molten metal, which has a recessed portion on the side surface for attaching a gas introduction pipe.

0002

[Prior Art] Conventionally, in the molding of refractory bricks having recesses on the sides, clay was placed in a metal frame, and the clay was pressurized, compressed, and shaped from above using hydraulic pressure, friction, etc. Finally, the molded body is pushed upward into the metal frame using hydraulic pressure from below to obtain a molded body, and after this molded body is fired, a recessed hole is bored in the side surface using a drill.

0003

[Problems to be Solved by the Invention] Since the formation of such conventional recesses is performed in a separate process from the molding of the clay, the work efficiency is poor and the product cost is increased.

[0004] The problem to be solved by the present invention is to find a means for forming such a recess on the side surface of a refractory brick at the time of molding the clay.

[0005]

[Means for Solving the Problems] The present invention involves adhering a magnetic material having a shape and size corresponding to a recess to be formed in advance to a predetermined position on the inner surface of a molding frame made of a ferromagnetic material, and It is characterized by filling a refractory material inside and pressurizing it.

[0006]

[Operation] The arrangement position of the molding magnetic material magnetically attached to the inner surface of the molding frame shifts in the pressing direction during pressure molding of the clay. By predicting this deviation empirically and pasting the adhesive at a position that takes into account the deviation, it is possible to form a side recess at a substantially planned location at the same time as the molding.

[0007]

EXAMPLE The present invention was applied to the production of a porous brick for a gas blowing nozzle having a recess for attaching a gas introduction pipe.

The accompanying drawings illustrate embodiments of the invention.

FIG. 1 shows a cross section of a formwork 1 used in the present invention.

In the figure, 2 is a mold body made of iron, and 3 is a bottom plate disposed on the inner bottom surface of the form, and the center of the bottom plate 3 has a hole for forming an inner hole surface. Core 4 is attached. Reference numeral 5 indicates a recess forming member for forming a recess into which a gas introduction pipe is attached on the side surface of the manufactured porous refractory brick. The recess forming member 5 is made of ferromagnetic material, and the recess 6 for attaching the gas introduction pipe to be finally formed.
It is attached to a predetermined upper position by magnetic force.

FIG. 2 shows the filling state of clay before pressure molding.

As shown in the figure, a mold 1 was lightly filled with a refractory raw material such as alumina or magnesia-spinel whose particle size was adjusted as clay 7.

FIG. 3 is a diagram showing a mode of pressure molding.

When the filled clay 7 is molded by pushing the upper frame 8, the recess forming member 5 is moved from the pre-arranged position shown by the dotted line to the planned gas introduction pipe attachment due to the flow accompanying the pressurization of the clay 7. The molded body 9 slides into position and a recess is formed there, and the molded body 9 pushes up the bottom plate 3 in the direction of the arrow to take out the molded body.

FIG. 4 shows the appearance of the molded body 9.

As shown in the figure, this molded body 9 is a porous brick molded body for a gas blowing nozzle and has a recess 10 on the side for attaching a gas introduction pipe, and the recess is formed at a predetermined location. The quality of the molded product was sufficient to be used as a gas blowing nozzle, and there was no problem at all in attaching the gas introduction pipe.

[0017]

[Effects of the Invention] The following effects can be achieved by the present invention.

(1) Since recesses can be continuously formed on the sides during pressure molding of the clay, molding efficiency is improved.

(2) Since the concave portion is press-molded while the molded clay is restrained by the frame, the molded body will not be deformed or destroyed.

(3) The location where the recess is formed has only a slight deviation from the pre-planned location, and there is no problem at all in actual work.

[Brief explanation of the drawing]

FIG. 1 shows a cross section of a formwork used in an embodiment of the invention.

FIG. 2 shows the filling state of clay before pressure forming in the same mold.

FIG. 3 shows a mode of pressure molding of clay within the same mold.

FIG. 4 shows the appearance of the molded product.

[Explanation of symbols]

1 Formwork 2　Form body 3. Bottom board 4 Core 5　Concave molding member 6 Installation recess for gas introduction pipe 7. Clay 8 Upper frame 9 Molded object 10 Recess for installing gas introduction pipe

Claims (1)

[Claims] Claim 1: A magnetic material having a shape and size corresponding to the recess to be formed in advance is adhered to a predetermined position on the inner surface of a forming frame made of a ferromagnetic material, and the forming frame is filled with a refractory raw material. A method for forming refractory bricks that have recesses on the sides that are pressed.