JPH0788628A - Runner brick - Google Patents

Abstract

PURPOSE:To facilitate the demolishing work after casting without sticking of a runner brick to a groove caused by thermal expansion by forming the cross sectional shape of the runner brick arranged into a groove in a stool brick so as to be narrower width as the lower part side of a flowing hole comes downward. CONSTITUTION:In the large stool brick 10 recessed groove 10 is formed in the longitudinal direction and the runner brick 12 is set through a cast iron-made liner 11. The liner 11 is fixed to the large stool brick 10 with a bolt 14 through an iron plate 13 for adjusting the height of the runner brick 12. The runner brick 12 whose cross sectional shape is narrower than the groove 10a as the lower part side of the flowing hole 12a comes downward. By this shape, even if the thermal expansion caused by the heat of the molten metal is developed, the thermal expansion is escaped upward along the wall surface of the liner 11 and the runner brick 12 is not stuck to the liner 11. Therefore, the runner brick 12 can easily be removed from the large stool brick 10 after casting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runner brick for forming a runner when casting a steel ingot or the like.

[0002]

2. Description of the Related Art The bottom pouring ingot method, which is known as a steel ingot casting method, is a method in which a molten metal is poured from a ladle into an injection pipe in a runner formed by a plurality of runner bricks installed in a groove of a surface plate. And pour this molten metal from the bottom of the mold by using the water pressure,
This is a method of casting a steel ingot. In this lower pouring ingot method, sand is placed between the surface plate and the runner brick in order to fix it.

Conventionally, the work of packing sand with such a surface plate has to rely on manpower, and there has been a problem that the work of packing sand is complicated and time-consuming. In addition, sand is mixed in the cast steel ingot to cause quality defects, and it takes time to remove sand from the surface plate after casting and cleaning work, and a lot of dust caused by sand is generated. There was a problem. In particular, in recent years, it has been desired to reduce the use of sand as much as possible from the viewpoint of improving the work environment and workability in the above-mentioned ingot making work.

Therefore, in the lower pouring ingot method,
Currently, a method of not using sand to be placed between the surface plate and the surface plate is being studied.

[0005]

By the way, the sand arranged between the surface plate and the runner brick is for fixing the runner brick to the surface plate. Therefore, if the runner brick can be fixed to the surface plate, it is not necessary to use sand. For this reason, it is possible to install the runner bricks directly on the surface plate. However, normally, the runner bricks are thermally expanded by flowing the high-temperature molten metal, and the runner bricks on the lower side of the runners are fitted into the grooves in the surface plate. For this reason, when removing the runner bricks in the surface plate for residual hot water treatment after casting, the runner bricks are cracked on the lower side of the runner and remain in the surface plate, which makes the brick removal work very difficult. There was a problem of becoming.

[0006] The present invention has been made in view of the above points, and provides a runner brick that does not fit into a groove in a surface plate due to thermal expansion and is easily removed after casting. The purpose is to

[0007]

According to the present invention, in order to achieve the above object, in a runner brick installed in a groove formed on a surface plate, the runner brick has a through hole serving as a runner. The cross-sectional shape orthogonal to the direction was formed so that the lower side of the flow hole was narrower than the groove width of the surface plate.

[0008]

[Function] The runner brick is thermally expanded by the heat of the molten metal at the time of casting, but it is formed so that it is narrower toward the lower side of the flow hole than the groove width of the surface plate. Brick does not fit into the groove of the surface plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a casting facility 1 for casting a steel ingot by a bottom pouring ingot method, in which an injection pipe 20 and a mold 30 are arranged on a large surface plate 10,
Are provided radially around the injection pipe 20 (not shown).

As shown in FIG. 1, the large surface plate 10 is a surface plate in which a groove 10a is formed in the longitudinal direction, and the liner 1 is made of cast iron.
A plurality of runner bricks 12 are installed through 1. The liner 11 replaces the sand conventionally packed between the large surface plate and the runner brick, and is a groove-shaped member like the large surface plate 10. As shown in FIG. 2, the liner 11 is fixed to the large surface plate 10 with bolts 14 via an iron plate 13 for adjusting the height of the runner brick 12.

The runner brick 12 is a circulation hole 12 which serves as a runner.
a is formed inside, and as shown in FIG.
The concave groove 1 has a cross-sectional shape orthogonal to the direction of “a” such that the lower side of the flow hole 12a becomes narrower than the groove width of the concave groove 10a.
Both sides in the width direction of 0a are formed in a tapered wedge shape.
Then, as shown in FIG. 1, between the end portion of the runner brick 12 and the end wall 10b of the large surface plate 10, a runner brick holding jig (hereinafter, simply referred to as a “holding jig”) 5, 6 are arranged.

The pressing jigs 5 and 6 are two jigs of different sizes, which are made of metal, such as iron, so that they can be repeatedly used. A plurality of runner bricks installed on the large surface plate 10 are used. In the casting operation, 12 is pressed so as not to move due to the pressure of the molten metal. The holding jigs 5, 6 are trapezoidal wedge-shaped members each having one end surface formed on the inclined walls 5a, 6a and the other end surface formed on the vertical walls 5b, 6b. It is arranged between the end of the road brick 12 and the large surface plate 10.

As shown in FIG. 1, the injection pipe 20 is provided with a lower injection pipe 21 standing on the large surface plate 10 and an upper injection pipe 22 having an upper portion formed in a funnel shape. A plurality of injection pipe bricks 23 that guide the molten metal to the runner formed by the plurality of runner bricks 12 are erected. Inside each of the injection pipe bricks 23, a circulation hole 23a serving as a runner is formed.

A buffer pipe 24 and an iron pipe 25 are arranged between the injection pipe 20 and a plurality of injection pipe bricks 23. The buffer pipe 24 and the iron pipe 25 replace the sand conventionally packed between the injection pipe and the injection pipe brick, and the iron pipe 25 is arranged outside the buffer pipe 24. The mold 30 is erected on the end of the large surface plate 10 via a double surface plate 31, and a steel ingot is cast in this mold 30.

In the casting equipment 1, when the molten metal is poured from the upper part of the casting pipe 20 during casting of the steel ingot, the molten metal passes through the plural casting pipe bricks 23 and the plural runner bricks 12
Flowing into the runner formed by the circulation hole 12a, and is poured into the mold 30 from below by the molten metal pressure of the molten metal. Thus, in the casting equipment 1, the injection pipe 2
Six large surface plates 10 that are radially arranged with 0 as the center
A large number of steel ingots are cast at one time by the six molds 30 provided upright at the ends of the. Further, when the casting equipment 1 is dismantled after casting the steel ingot, the runner brick 12 and the injection pipe brick 23 are destroyed because they are destroyed, but the holding jigs 5, 6 and the liner 11 are reused.

At this time, as shown in FIG. 2, the runner brick 12 is formed so that the width of the lower part of the flow hole 12a becomes narrower than the groove width of the concave groove 10a. Therefore, even if the runner brick 12 thermally expands due to the heat of the molten metal, the expansive force associated with the expansion escapes upward along the wall surface of the liner 11, so that the runner brick 12 fits into the liner 11. There is no end. Therefore, the runner brick 12 can be easily removed from the large surface plate 10 after casting, and the dismantling work becomes very easy.

Here, if the runner brick is formed such that the cross-sectional shape orthogonal to the direction of the flow hole 12a is narrower toward the lower side of the flow hole 12a than the groove width of the concave groove 10a, The shape is not limited. That is, the circulation hole 1
In the cross-sectional shape orthogonal to the direction of 2a, for example, as shown in FIG.
Like the runway brick 16 shown in FIG.
The lower side of the through hole 18a may be circular, or like the runner brick 18 shown in FIG.
Even if the recessed groove 10a has a tapered wedge shape on both sides in the width direction so that the groove width is narrower than the groove width of a, and the lower portion is formed into a circular shape,
The same effects as those of the above-described embodiments can be obtained.

In the above embodiment, the runner brick is provided with the liner 11 between the runner brick and the large surface plate 10 to form the concave groove 10.
The case where it is installed in a has been described. However, if the runway brick is manufactured with high precision, the molten metal will not leak from the seam during casting and the metal (molten metal) will not be seized on the surface plate. It can be installed and liner 11 is not necessary.

[0019]

As is clear from the above description, according to the runner brick of the present invention, even if the runner brick is thermally expanded by the heat of the molten metal during casting, the groove width of the surface plate is closer to the lower side of the flow hole than the groove width of the surface plate. Since it is molded so as to be narrow, the thermally expanded runner brick does not fit into the groove of the surface plate and can be easily removed from the surface plate after casting, which makes dismantling work extremely easy. It has an excellent effect of being easy.

Moreover, by using the runner brick of the present invention, it is not necessary to fill the sand with the surface plate, and the working environment and workability in the ingot making work are dramatically improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a casting facility using a runner brick of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view showing another shape of a runner brick.

FIG. 4 is a cross-sectional view showing still another shape of the runner brick.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting equipment 5,6 Runway brick holding jig 10 Large surface plate 10a Recessed groove 10b End wall 11 Liner 12 Runway brick 12a Distribution hole 16,18 Runway brick 20 Injection pipe 23 Injection pipe brick 24 Buffer pipe 25 Iron pipe 30 mold 31 double surface plate

Claims (1)

[Claims] 1. In a runner brick having a through hole serving as a runner and installed in a groove formed on a surface plate, a cross-sectional shape orthogonal to the direction of the through hole is closer to a lower side of the through hole. A runner brick, which is formed to be narrower than the groove width of the surface plate.