JP2001032004A - Manufacturing method of stave cooler - Google Patents

Abstract

(57) [Problem] To manufacture a stave cooler in which a brick block and a cooling pipe are cast and a mounting bolt hole is formed using a mold composed of a lower mold and an upper mold separately molded in advance. Provided is a method of manufacturing a stave cooler that enables a high-density arrangement of cooling pipes by preventing a cooling pipe from interfering with a core for forming a mounting bolt hole when a mold and an upper mold are combined. SOLUTION: The core is divided in advance in the axial direction into two parts,
The lower core is disposed in the lower mold, and the upper core is provided with an insertion hole (a stupid hole) for the upper core to be fitted with the lower core and a two-piece core hole.
After combining the lower mold and the upper mold, insert the upper core from the insertion hole, fit the lower end of the lower mold into the lower core arranged in the lower mold, fix the upper part, and pour the molten metal into the formed mold. It is poured and solidified, and the refractory brick and the cooling pipe are cast into a stave, and a bolt seat having a bolt hole for attaching the stave is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stave cooler used for cooling a furnace of a metal smelting furnace such as a blast furnace, a shaft furnace, a converter, and the like.
The present invention relates to a method for manufacturing a stave cooler in which a refractory brick and a cooling pipe are cast and bolt holes for mounting are formed.

[0002]

2. Description of the Related Art In recent years, for example, a blast furnace furnace body is provided with a stave cooler in which a plurality of staves each having a plurality of cooling pipes forming a refrigerant passage are connected inside a blast furnace shell around the furnace for cooling. Installed on the furnace wall.

For example, Japanese Patent Application Laid-Open No. 7-76711 discloses that
As shown in FIG. 4, a large number of refractory bricks 2 and a plurality of cooling pipes 3 for circulating a cooling medium are cast in a cast iron stave 1, and bolt holes 6 for mounting are formed. A stave cooler fixed to a blast furnace steel shell by bolts 5 inserted into holes 6 is disclosed. In this stave cooler, a number of staves 1 in which a refractory brick 2 and a cooling pipe 3 are cast inside and a bolt seat 10 having a bolt hole 6 is formed, a bolt 5 is inserted from the inside of the furnace, and the tip is made of blast furnace iron. It is made to protrude to the outside of the skin 4, fastened with nuts 7, arranged side by side inside the blast furnace steel 4, connected and fixed, and cooled by circulating a coolant through the cooling pipe 3 cast and arranged inside, It has a structure for cooling the blast furnace body. Stave 1 constituting such a stave cooler
Is generally manufactured by casting, and a mold used for this casting is formed by combining a lower mold and an upper mold that have been formed in advance.

Conventionally, in manufacturing a stave 1 using this split mold, as shown in FIG. 5, for example, a bolt hole 6 for inserting a refractory brick 2 and a mounting bolt 5 is formed in a preformed bottom. An upper mold F in which a lower mold Fu on which a core 8 is set, has a space 10o in which a bolt seat 10 is formed around the core 8 and a cooling pipe 3 is arranged at a predetermined position.
o are combined up and down and clamped to form mold F. After pouring the molten metal 9 from the ladle 11 into the mold F and solidifying it, the mold F is dismantled, the refractory brick 2 and the cooling pipe 3 are cast, and bolt holes 6 for mounting are formed. A stave 1 having a seat 10 as shown in FIG.

[0005] As described above, a plurality of cooling pipes 3 are arranged in the stave 1, but the arrangement interval of the cooling pipes is generally not so narrow, and when the lower mold Fu and the upper mold Fo are combined during casting. In addition, the intervals are not set such that interference occurs such that the integral core 8 provided in the lower die Fu contacts the cooling pipe 3 provided in the upper die Fo.

However, in recent blast furnaces, there has been an increasing demand for a stove cooler to enhance the cooling capacity, and in order to meet this demand, a cooling pipe 3 cast into the stave 1 is required.
Need to be arranged at high density. For this reason, the cooling pipes 3 are arranged close to each other. As a result, the core 8 and the cooling pipes 3 are likely to interfere with each other when the lower die Fu and the upper die Fo are combined, particularly in a stave having a high bolt seat. It is difficult to install the core 8.

If there is interference such as contact between the core 8 and the cooling pipe 3, the core 8 and the cooling pipe 3 are displaced or damaged, and the stave 1 obtained by casting becomes defective. I will. Therefore, the stud 1 manufactured using the mold F in which the core 8 is not arranged is machined to form a bolt hole for mounting. However, the drilling of these bolt holes is often arranged in an inclined position, and the cast-in pipe is moving during casting. In addition to the above-mentioned techniques, there is a problem in that productivity is reduced as well as machining cost and work load are increased due to machining.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a stave in which a refractory brick and a cooling pipe are cast using a mold having a lower mold and an upper mold which are separately molded in advance, and a mounting portion having a mounting bolt hole is formed. In the case of manufacturing a cooler, when the lower mold and the upper mold are united, the core and the cooling pipe for forming the mounting bolt holes are prevented from interfering with each other to solve the problems as in the conventional method, An object of the present invention is to provide a method for manufacturing a stave cooler that enables a cooling pipe to be arranged at a high density.

[0009]

That is, the present invention relates to a lower mold formed by disposing a core forming bolt holes for mounting a refractory brick and a stave, and an upper mold formed by disposing a cooling pipe. In a method for manufacturing a stave cooler, in which a molten metal is poured into a mold obtained by combining the above and a solidification, a core is divided into upper and lower parts, and a lower part is located below a cooling pipe provided when the lower core is combined. Molded and installed in the lower mold, providing the upper core with an insertion hole for the upper core connected to this lower core, inserting the upper core from the insertion hole after combining the lower mold and the upper mold, The lower core of the upper core is connected to the lower core arranged in the lower mold, and the upper end is fixed to the upper mold. Then, the molten metal is poured into the formed mold to solidify and mold. Is a method for manufacturing a stave cooler. A small diameter connecting rod must be implanted in the lower core, and 2
Preferably, a split core is provided, which serves as a guide when connecting the upper core to the lower core.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method for manufacturing a stave in which cooling pipes are arranged at a high density when forming a stave cooler for cooling a furnace of a metal smelting furnace, for example, a blast furnace. Using a mold consisting of an upper mold, casting a refractory brick and a cooling pipe on a stave, and forming an attachment part with bolt holes for attachment, when combining the lower mold and upper mold separately molded in advance The core is divided so that the core for forming the bolt hole and the cooling pipe attached to the upper die do not interfere with each other. When the molds are combined, they are arranged shorter so that they are lower than the cooling pipe position that is provided.This makes it possible to arrange cooling pipes at high density on the stave, and the cooling capacity of the stave cooler And stave Together to reduce the production cost,
It is intended to improve productivity.

According to the present invention, the cooling pipe provided in the upper mold when the lower mold and the upper mold separately molded in advance are divided by dividing the core forming the mounting bolt hole in the axial direction. In order to avoid interference with the lower core, a short lower core is placed in the lower mold. Cooling pipes are mounted on the upper mold at high density, and the upper core insertion hole After the upper mold is combined with the lower mold, a half of the upper half is first set on the upper mold, and the hollow upper core is inserted through the upper mold insertion hole (the stupid hole). It is connected to the lower core placed in the lower mold while sliding according to the angle of the half of the split core.

At this time, if the lower core is provided with a small-diameter connecting rod having an appropriate length at the upper end thereof, the rod itself is small in diameter, so that it does not interfere with the cooling pipe or avoids interference. The upper core can be guided and the upper core can be guided when the upper core descends.
It can be set to connect with the lower core without making contact.
After setting, when using carbon steel pipe for the upper core, fill the hollow with refractory kneading sand, fill the upper part with kneading sand and fix it, then inject the molten metal into the mold and solidify it, with the refractory brick It is possible to manufacture a stave in which a cooling pipe arranged at high density is cast and a bolt hole for mounting is formed.

According to the present invention, the core for forming the mounting bolt hole is formed by casting a bolt hole for inserting a bolt for fixing the stave to the blast furnace steel shell, and comprises a lower core and an upper core. As a forming material, a refractory (molded sand or ceramic molded product) or a carbon steel pipe can be used, and the lower core and the upper core may be formed of the same material or may be formed of different materials. . When a refractory is used for the upper core, a hole that engages with a connecting rod provided in the lower core may be provided at a lower portion of the core refractory. When a refractory is used, it is removed after casting. However, when a carbon steel pipe is used, it is left in a stave, and a hollow portion of the carbon steel pipe can be formed as a bolt hole. When a carbon steel pipe is used, it is welded to the stave body, so that the hollow portion of the carbon steel pipe is filled with kneading sand or the like to secure a hole shape.

The connection structure between the lower core and the upper core includes:
For example, as described above, a connecting rod having a small diameter is implanted in the lower core, and the connecting rod is inserted into a fitting hole formed in the upper core as a guide so that the upper core matches the lower core. Structure,
It is possible to select a connection structure or the like in which a fitting projection is formed at the distal end of the lower core and a fitting hole is formed in the upper core so that the projection and the fitting hole can be directly and easily fitted.

After the upper core and the lower core are connected, the upper core is fixed at the upper end with a two-piece core in order to fix the position of the upper core and prevent the upper core from being lifted up. It is filled with kneading sand and fixed, but it is effective as a fixing structure to cover the insertion hole (the stupid hole) with refractory or casting sand, and to take measures against stiffness using round steel or the like.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a structural example of a stave cooler of a blast furnace obtained by casting according to the present invention. In FIG. 1, reference numeral 1 denotes a stave obtained by the present invention, in which cooling pipes 3 are arranged at a high density, and a refractory brick 2 is arranged on a surface to be inside the furnace.
A bolt seat 10 having a bolt hole 6 for attachment is formed.

When this stave is manufactured according to the present invention, the core 8 forming the mounting bolt hole 6 is conventionally integrally formed and implanted in a lower mold. As shown in the figure, the lower core 8u is disposed on the lower mold Fu which has been formed in advance, and the upper core 8o is inserted from the upper mold Fo. That is, when the integral core 8 is used,
When the lower mold Fu and the upper mold Fo are combined, the core 8 may interfere with the cooling pipes 3 arranged at high density in the upper mold Fo and come into contact with each other to cause deformation, displacement, or breakage. In the present invention, in order to avoid this, the core 8 is divided into upper and lower parts, and the lower core 8u is made lower than the position on the cooling pipe 3,
It is arranged on the lower mold Fu together with the refractory brick 2.

In the example shown in the figure, the lower core 8u is formed of a refractory having a small diameter connecting rod 13 made of round steel or the like implanted at the center. Since the connecting rod 13 has a small diameter, it does not interfere with the cooling pipe 3 provided, and also serves as a guide for the upper core 8o. The upper core 8o is preferably formed of a steel pipe, and the lower core 8u and the upper core 8o are composed of a lower mold Fu and an upper mold F
o, the two-piece core 19 is inserted into the two-piece core hole 18.
Is set first, and the upper core 8o is guided by the connecting rod 13 implanted in the lower core 8u while sliding the upper core 8o, and the upper core 8o is connected and set.

In the upper die Fo, a cooling pipe 3 is arranged at a high density, and a bolt seat 10 having a mounting bolt hole 6 is provided.
Is formed, and an insertion hole (fool hole) 12 for the upper core 8o communicating with this space is formed. In order to more reliably prevent the displacement of the cooling pipe 3, the cooling pipe 3 is fixed to the upper mold Fo with the support helmet 16.

After the upper mold Fo is combined with the lower mold Fu and clamped, the divided upper core 8o is inserted into the two-piece core hole 18 from the insertion hole (stray hole) 12 of the upper mold Fo. A half of the two-piece core 19 to be guided is set and inserted while sliding, and as shown in FIG. 3, is inserted into the connecting rod 13 implanted in the lower core 8u provided in the lower die Fu. The upper core 8o is connected while being guided, and is set so that the upper end of the upper core 8o is sandwiched by the two-part core 19 from both sides. After that, the fixing rod 14 is inserted into the insertion hole (the stupid hole) 12 and then fixed by filling with kneading sand serving as the closing material 15, thereby fixing the position of the upper core 8o and preventing floating during casting. . At this time, the upper core 8o is filled with the kneading sand 17 to strengthen the connection with the lower core 8u, and the upper core 8o is suppressed from being deformed, so that a good hole shape can be secured.

After the upper core 8o is connected to the lower core 8u and fixed at the upper part, the molten metal 9 is poured into the mold F from the ladle 11 and solidified, and then cooled with the refractory brick 2 and densely arranged. The stave 1 in which the pipe 3 is inserted and the bolt seat 10 having the mounting bolt hole 6 is formed can be manufactured. In the method for manufacturing a stove cooler of a blast furnace to which the present invention is applied as described above, it is possible to reduce the manufacturing cost and improve the productivity of the stave as compared with the conventional method.

The present invention is not limited to the contents of the above embodiment. For example, the above embodiment is directed to a stove cooler for a blast furnace, but the present invention can be applied to a stave cooler used for cooling a furnace body of another metal smelting furnace such as a shaft furnace or a converter. It is. In addition, stave conditions (shape, structure, mounting part shape, structure, layout), mounting bolt conditions, refractory brick conditions (shape, layout), cooling pipe conditions (shape, layout), mold conditions (structure, molten metal injection structure (including Injection position)), injection conditions (injection means), core conditions (shape, division, forming material, connection structure, upper fixing structure), etc. can be selected and changed without departing from the scope of the above-described claims. .

[0023]

According to the present invention, the core is divided into a lower core and an upper core, and the lower core does not interfere with the cooling pipe arranged in the upper die when the upper die is combined with the lower die. After the lower mold and the upper mold are combined, the upper core is inserted from the insertion hole provided in the upper mold and connected to the lower core, so the cooling arranged at high density Interference between the pipe and the core can be avoided, and the cooling capacity of the stave cooler can be increased. Further, as compared with the conventional method, stave manufacturing cost can be reduced and stave productivity can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structural example of a blast furnace stave obtained in an embodiment of the present invention, wherein FIG. 1 (a) is a plan explanatory view, FIG. 1 (b) is a partially cutaway side explanatory view, and FIG. (Lower surface) explanatory view.

FIG. 2 is an explanatory side sectional view showing a state in which a lower mold and an upper mold are combined in a structural example of a mold including a lower mold and an upper mold used in an embodiment of the present invention.

3 is a partially cutaway side sectional view showing a molten metal injection state in the structural example of the mold of FIG. 2 including a lower mold and an upper mold used in the embodiment of the present invention.

4A and 4B are explanatory views showing a structural example of a conventional general blast furnace stave, wherein FIG. 4A is a partially cutaway side view explanatory view, and FIG.

FIG. 5 is an explanatory side sectional view showing a molten metal injection state after a lower mold and an upper mold are combined in a structural example of a mold including a lower mold and an upper mold used in a conventional example.

[Explanation of symbols]

 1: stave 2: refractory brick 3: cooling pipe 4: blast furnace iron shell 5: mounting bolt 6: mounting bolt hole 7: nut F: mold Fu: lower mold Fo: upper mold 8: core u: lower core 8o: Upper core 9: Molten metal 10: Bolt seat 10o: Forming space of the mounting part 11: Ladle 12: Insertion hole (fool hole) 13: Connecting rod 14: Fixing rod 15: Closure material (kneading sand) 16: Support Keren 17: Kneading sand (in the pipe) 18: 2-piece core hole 19: 2-piece core

Claims (2)

[Claims] 1. A mold obtained by combining a lower mold formed by disposing a core for forming bolt holes for mounting a refractory brick and a stave and an upper mold formed by disposing a cooling pipe. In a method of manufacturing a stave cooler for injecting and solidifying a molten metal, the core is divided into upper and lower parts, and a lower core is formed and disposed in a lower mold so as to be positioned below a cooling pipe at the time of uniting, The upper core is provided with an insertion hole for the upper core to be connected to the lower core, the upper core is inserted from the insertion hole after the lower die and the upper die are combined, and the lower end of the upper core is formed in the lower die. A method for manufacturing a stave cooler, comprising: connecting to a lower core provided, fixing an upper end portion to an upper mold, injecting a molten metal into a formed mold, and solidifying and forming the same. 2. The method of manufacturing a stave cooler according to claim 1, wherein a connecting rod for guiding is planted in the lower core, and a two-piece core is disposed in the upper mold.