JPH08187548A - Jig for holding runner brick - Google Patents

Abstract

PURPOSE: To prevent the leakage of molten metal and to improve the yield of the molten metal by screwing an adjusting pipe at least at one end of a main pipe. CONSTITUTION: A recessed groove 10a is formed in the longitudinal direction of a bottom plate 10 and runner bricks 12 are set there through a liner 11. A communicating hole 12a is formed in the inner parts of the runner bricks 12. A runner brick holding jig 50 is arranged between the end part 12b of the runner brick 12 and the end part 10b of the bottom plate 10. The holding jig 50 is provided with the main pipe 51 and the adjusting pipes 52, 52 at both ends thereof and made of e.g. iron. Further, in the intermediate of the main pipe 51, setting plates 53, 53 for setting the holding jig 50 to a prescribed position of the recessed groove part of the liner 11 are fitted. The holding jig 50 changes the screwing distance by rotating the adjusting pipe 52 to adjust the length corresponding to the length of a gap. Thus, the runner brick is surely held and the development of the gap can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runner brick holding jig, and more particularly to a runner brick holding jig used for casting a steel ingot or the like by a lower pouring ingot method.

[0002]

2. Description of the Related Art The bottom pouring ingot method, which is known as a method for casting steel ingots, uses a molten metal injected from a ladle into an injection pipe into a runner formed by a plurality of runner bricks installed on a surface plate. It is to guide and pour this molten metal from the bottom of the mold by using the pressure of the molten metal. Therefore, during casting, the runner bricks installed on the surface plate may move due to the pressure of the molten metal, resulting in gaps at the joints between the runner bricks. When such a gap is generated, the molten metal leaks and the metal (molten metal) is burned on the surface plate, which causes a problem that it takes time to disassemble after casting. Therefore, in this lower pouring ingot method, in order to prevent the runner bricks from moving by the pressure of the molten metal and to prevent the occurrence of gaps at the joints between the runner bricks, between the runner bricks and the surface plate. Sand is intervened to keep the runner bricks from moving.

In addition, when the runner bricks are installed by filling the surface plate with sand and a step is formed at the joints between the runner bricks, during the casting, the runner pressure at the molten metal causes the runners at the joints. The bricks may float and gaps may form between the bricks, causing the molten metal to leak. In order to prevent such lifting, the top surface of the surface plate and the top surface of the runner brick are adjusted to be flush with each other during the sand filling operation. The runner bricks are prevented from rising by placing a metal holder on the runner bricks that have become flat (in particular, on the joints of the runner bricks).

The sand filling work in the lower pouring ingot method is a work that requires a great deal of skill in order to prevent the formation of gaps between runner bricks and is carried out manually. Since the sand filling work uses a large amount of sand, there is a problem that a large amount of dust is generated due to the sand and that cleaning and the like are troublesome. In addition, sand may be mixed into the cast steel ingot, resulting in poor quality. 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 casting work.

Therefore, a method of installing runner bricks on a surface plate without using sand has been proposed. In this method, a groove-shaped liner whose height can be adjusted is interposed between the runner brick and the surface plate, and the runner brick is installed on this liner. Then, in this method, a liner having a groove corresponding to the outer shape of the runner brick is fixed to the surface plate by a bolt via an iron plate for height adjustment, and the runner brick is installed in the groove. In this method, since no sand is used, the runner brick easily moves in the flow direction due to the pressure of the molten metal. Therefore, a runner brick holding jig made of a metal block for holding the runner bricks in a flow direction is provided at the end portion in the flow path direction of the runner bricks.

[0006]

By the way, when manufacturing a steel ingot by the bottom pouring ingot method, the length of the runner from the injection pipe to the mold is different depending on the size (height) of the steel ingot. come.
In other words, the distance between the end of the runner brick and the end wall of the surface plate differs depending on the shape of the steel ingot to be manufactured.Therefore, various runner brick pressing jigs with different lengths are prepared in advance according to this distance. It is necessary to keep it.

Further, when manufacturing a plurality of steel ingots having different sizes (heights), for example, a runner cutoff method is used.
In this runner block method, a small mold and a large mold are arranged on one surface plate, the molten metal is injected from an injection port of an injection pipe, and the molten metal is poured into each mold through the runner. And
When the molten metal is poured to a predetermined height in a small mold, a plug is pushed into the runner from the end of the runner brick to shut off the molten metal injection. On the other hand, the molten metal is continuously poured into the large mold, and the molten metal is poured to a predetermined height. After that, even in a large mold, the stopper is pushed into the runner from the end of the runner brick to block the injection of the molten metal. In this way, it is possible to manufacture steel ingots having different sizes with one platen.

When performing this runner-blocking method, it is necessary to push the plug into the runner from the end of the runner brick. The presence of the tool makes it difficult to push the stopper.
Therefore, the present invention solves the above-mentioned problems in the bottom pouring ingot making method and can cope with the production of steel ingots of various shapes,
It is an object of the present invention to provide a runner brick pressing jig that enables a plug to be easily pushed into the runner.

[0009]

In order to achieve the above object, in the present invention, between the end portion of the runner brick which is installed in the groove of the surface plate to form the runner and the end wall of the surface plate. In the runner brick holding jig that holds the runner bricks,
There is provided a runner brick holding jig including a main pipe and an adjusting pipe screwed to at least one end of the main pipe.

Further, when casting is carried out by the runner shutoff method, in order to push the plug into the runner, the runner brick pressing jig is detachably arranged inside the main pipe and the adjusting pipe. It is preferable to have a structure having a rod. Further, in order to confirm whether the rod is loaded in a predetermined position, it is preferable that the main pipe has a window portion.

[0011]

Since the runner brick holding jig is provided with the main pipe and the adjusting pipe screwed together by the screw portion, the length can be arbitrarily adjusted by changing the screwing amount of the screw portion. . In addition, the rod that can be freely inserted into and removed from the main pipe and the adjustment pipe, while holding down the runner brick,
You can push the plug that blocks the runner into the runner.

Further, if the main pipe is provided with a window, the rod can be easily confirmed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a casting facility 1 for casting a steel ingot by a lower pouring ingot method is provided with an injection pipe 2 on a surface plate 10.
0 and the mold 30 are arranged, and the surface plate 10 is provided with six concave grooves 10a in a radial pattern centered on the injection pipe 20 (not shown).

As shown in FIG. 1, the 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 surface plate and the runner brick, and is a groove-shaped member like the surface plate 10. As shown in FIG. 2, the liner 11 is fixed to the surface plate 10 by a bolt 14 via an iron plate 13 for adjusting the height of the runner brick 12. In addition, runway brick 12
Has a circulation hole 12a formed therein as a runner.
Then, as shown in FIG. 1, the end 12 of the runner brick 12
A runner brick holding jig (hereinafter, simply referred to as a “holding jig”) 50 is arranged between b and the end wall 10b of the surface plate 10.

As shown in FIG. 3, the holding jig 50 includes a main pipe 51 and adjusting pipes 52 screwed on both ends thereof.
And a pipe made of iron, for example. Also,
A holding jig 50 is provided between the main pipe 51 and the liner 11.
Installation plates 53, 53 for installation at predetermined positions in the concave groove portion of the
Is fitted. Each installation plate 53 is formed in a shape that matches the concave groove of the liner 11.

The holding jig 50 is arranged in the gap between the end 12b of the runner brick 12 and the end wall 10b of the surface plate 10. At this time, the pressing jig 50 can correspond to the length of the gap by rotating the adjustment pipe 52 to change the screwing amount and adjust the length. As shown in FIG. 1, the injection pipe 20 includes a lower injection pipe 21 standing on the surface plate 10 and an upper injection pipe 22 having an upper portion formed in a funnel shape.
And a plurality of injection pipe bricks 23 for guiding the molten metal to the runner formed by the plurality of runner bricks 12 inside.
Is erected. Inside each of the injection pipe bricks 23, a circulation hole 23a serving as a runner is formed. The buffer pipe 24 and the iron pipe 25 are arranged between the injection pipe 20 and the plurality of injection pipe bricks 23. Buffer pipe 2
4 and the iron pipe 25 replace the sand conventionally packed between the injection pipe and the injection pipe brick, and the buffer pipe 24
The iron pipe 25 is arranged outside the.

The mold 30 has a double surface plate 3 at the end of the surface plate 10.
1, the steel ingot is cast. The double surface plate 31 also functions as a metal holder that prevents the seam of the runner brick 12 from rising. In the casting equipment 1, when the molten metal was injected from the upper part of the injection pipe 20 during the casting of the steel ingot, the molten metal passed through the multiple injection pipe bricks 23 and was formed by the flow holes 12 a of the multiple runner bricks 12. The molten metal flows into the runner and is poured into the mold 30 from below by the molten metal pressure of the molten metal.

Thus, in the casting equipment 1,
A large number of steel ingots are cast at one time by the six molds 30 standing upright on the end of the surface plate 10 which is radially provided around the injection pipe 20. At this time, the molten metal is poured from the upper portion of the injection pipe 20, and the molten metal is poured into a plurality of injection pipe bricks 23.
Also, the molten metal is poured into each mold 30 through the runner bricks 12 by the pressure of the molten metal. Therefore, the runners, especially,
The molten metal pressure acts on the runner formed by the plurality of runner bricks 12 provided on the surface plate 10 due to the difference with the height of the molten metal in the injection pipe 20.

However, since the pressing jig 50 is arranged between the end portion 12b of the runner brick 12 and the end wall 10b of the surface plate 10, the plurality of runner bricks 12 are firmly attached to the surface plate 10. , And it doesn't move by the water pressure. For this reason, since the molten metal does not leak from the joints of the plurality of runner bricks 12, the yield of the molten metal in the casting operation is improved.

Moreover, the molten metal does not leak from the joints of the runner bricks 12, and the runner bricks 12 are held on the surface plate 10 by the holding jig 50 without using sand. The dismantling and cleaning work of the surface plate 10 become very easy, and the working environment and workability are greatly improved. 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 pressing jig 50 and the liner 11 are reused.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The right side of the drawing of the casting equipment 6 for casting a plurality of steel ingots of different sizes by the down pouring ingot making method is shown in FIG. 4, and the left side of the drawing of the casting equipment 6 is shown in FIG. Casting equipment 6
Corresponds to the runner interception method in which a plurality of steel ingots of different sizes are cast on one surface plate. In the casting facility 6, the surface plate 10 includes an end wall 10 located at an end of the groove 10a.
A surface plate similar to that of the first embodiment is used except that the insertion hole 10c is provided in b. Therefore, as in the first embodiment,
An injection pipe 20 is installed at the center of the surface plate 10 and has a groove 10a.
A plurality of runner bricks 12 are installed via a cast iron liner 11. Here, the insertion hole 10c is a plug 8 described later.
The rod 74 for pushing in is set to a size such that it can be removed and inserted with a margin. Further, as the runner brick 12 at the outermost end, one in which the flow hole 12a penetrates to the holding jig 70 side is used. Then, the plug 8 for shutting off the runner is inserted into the circulation hole 12a of the runner brick 12 at the outermost end on the holding jig side.

The plug 8 is in direct contact with the molten metal and the runway 1
Since it is urged to move inside 2a, it is a columnar block made of, for example, graphite having heat resistance and impact resistance. The holding jig 70, as shown in FIGS.
1, except that a window portion 71a that allows the inside to be seen is provided in the middle of No. 1 and that a rod 74 for pushing the stopper 8 is disposed inside the window portion 71a so as to be freely inserted and removed. It is the same as 50. The holding jig 70 is arranged between the end portion 12b of the runner brick 12 and the end wall 10b of the surface plate 10. At this time, the holding jig 70 adjusts the length by changing the screwing amount by rotating the adjusting pipe 72, and between the end 12b of the runner brick 12 and the end wall 10b of the surface plate 10. It can correspond to the length of the gap.

The rod 74 has an outer diameter slightly smaller than the hole diameter of the flow hole 12a, reaches the plug 8 in the flow hole 12a from the outside of the end wall 10b of the surface plate 10, and only pushes the plug 8 to a predetermined position. For example, an iron rod having a length of The rod 74 is pressed from the insertion hole 10c to the holding jig 7.
It is inserted through 0 into the flow hole 12a of the runner brick 12. At this time, one end of the rod 74 is brought into contact with the stopper 8,
The other end is made to project outside the end wall 10b of the surface plate 10 by a predetermined length.

Next, a double surface plate 31 is attached to the end of each runner brick.
The molds 30 and 40 of various sizes are respectively erected via the. When casting ingots of various sizes in the casting equipment 6 as described above, first, the molten metal is injected from the upper part of the injection pipe 20, and the molten metal is poured from the lower part of each mold through each runner 12. To go. Then, when the height of the molten metal in the smallest mold 40 reaches a predetermined height h, the end of the rod 74 on the mold 40 side is pushed in the direction of arrow A by an air cylinder (not shown). Then, the plug 8 in the flow hole 12a is pushed to a predetermined position, and the runner is blocked so that the molten metal is not poured into the mold 40. On the other hand, in the large mold 30, the molten metal is continuously injected.

When the height of the molten metal in the mold 30 reaches a predetermined height H, the end of the rod 74 on the mold 30 side is pushed in the direction of arrow B by an air cylinder (not shown). Then, the plug 8 in the flow hole 12a is pushed to a predetermined position, and the runner is blocked so that the molten metal is not poured into the mold 30 any more. As described above, multiple casting molds of different sizes are installed, and while the molten metal is being injected, the runners are blocked in order from the small casting mold, so that a series of steel ingots of different sizes can be processed in a single casting facility. It can be cast by operation.

[0026]

The runner brick holding jig according to the first aspect of the present invention comprises the main pipe and the adjusting pipe screwed to the main pipe. Therefore, the length can be changed by changing the screwing amount of the adjusting pipe. It can be adjusted. Therefore, it is possible to cope with the gap between the end portion of the runner brick and the end wall of the surface plate, which varies depending on the shape of the steel ingot to be manufactured. Therefore, since the runner brick is surely pressed to suppress the generation of the gap, the molten metal is prevented from leaking and the yield of the molten metal in the casting operation is improved.

Since this runner brick holding jig has a pipe shape, it can be made lighter than a block-shaped jig. Therefore, it is easy to carry and workability such as installation and removal is improved. In the runner brick pressing jig according to claim 2, since the rod for pushing the plug for shutting the runner is arranged in the pipe, the runner can be easily shut off by operating the rod. Suitable for law. Therefore, it is possible to cast a plurality of steel ingots having different sizes with one surface plate, which contributes to the improvement of the productivity of the steel ingots.

In the runner brick holding jig according to the third aspect, since the main pipe is provided with the window portion, the inside of the pipe can be seen and the loaded state of the rod inside can be easily confirmed. Therefore, it is possible to prevent the runner from being interrupted due to forgetting to load the rod after the start of operation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a casting facility for a lower pouring ingot method.

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

FIG. 3 is a perspective view showing a configuration of a runner brick pressing jig.

FIG. 4 is a cross-sectional view showing a configuration on the right side of a casting facility for casting a steel ingot by a runner shutoff method.

FIG. 5 is a cross-sectional view showing a configuration on the left side of a casting facility for casting a steel ingot by a runner shutoff method.

FIG. 6 is a perspective view showing another shape of the runner brick pressing jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting equipment 6 Casting equipment 8 Plug 10 Surface plate 10a Recessed groove 10b End wall 10c Insertion hole 11 Liner 12 Runway brick 12a Distribution hole 12b End (of runway brick) 13 Iron plate (for height adjustment) 14 Bolt 20 Injecting pipe 21 Lower injecting pipe 22 Upper injecting pipe 23 Injecting pipe brick 23a Flow hole (of injecting pipe) 24 Buffer pipe 25 Iron pipe 30 Mold (large) 31 Double platen 40 Mold (small) 50 Runway brick holding jig 51 Main pipe 51a Hollow part 52 Adjustment pipe 53 Installation plate 70 Runway brick holding jig 71 Main pipe 71a Window part 72 Adjustment pipe 73 Installation plate 74 Rod

Claims (3)

[Claims] 1. A runner-brick pressing jig which is disposed between an end portion of a runner brick which is installed in a groove of a surface plate to form a runner and an end wall of the surface plate and which holds the runner brick. A runner brick holding jig comprising a main pipe and an adjusting pipe screwed onto at least one end of the main pipe. 2. The runner brick holding jig according to claim 1, wherein the main pipe and the adjusting pipe have rods that are arranged inside so as to be freely inserted and removed. 3. The runner brick holding jig according to claim 2, wherein the main pipe is provided with a window portion.