KR101597455B1 - Closure preventive device for air vent hole - Google Patents

Abstract

The present invention relates to a device to prevent clogging of an air vent hole which prevents clogging of an air vent hole due to casting sand on a molding work or rust on a storage facility. The device comprises: a band part to envelop an external surface of a female flask formed in the air vent hole; and a process part mounted to the bend part and inserted into the air vent hole.

Description

{CLOSURE PREVENTIVE DEVICE FOR AIR VENT HOLE}

The present invention relates to an air vent hole clogging prevention member capable of preventing clogging of an air vent hole formed in a lower flask.

Generally, work rolls are produced by vertical and horizontal centrifugal casting, or by political casting.

The work rolls produced by the centrifugal casting method and the casting method described above are composed of a moving body portion to which the material directly contacts and a neck portion provided integrally at both ends of the moving body portion.

A related prior art is Korean Utility Model No. 2009-0005925 (public date: June 18, 2009, name: "centrifugal casting mold lower mold flask").

An object of the present invention is to provide an air vent hole clogging prevention device which can prevent the air vent hole from being clogged by molding sand or the like when the molding work is performed.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems.

According to another aspect of the present invention, there is provided an apparatus for preventing clogging of an air vent hole, comprising: a band portion surrounding an outer surface of a lower flask having an air vent hole; And protrusions mounted on the band portion and fitted in the air vent holes.

Specifically, the band portion is made of iron and has a plurality of unit blocks having a vertical plate shape; And a plurality of connection pins connecting the unit blocks.

More specifically, a first boss and a second boss are formed at one end and the other end of the unit block, the first boss extends from the central portion of one end of the unit block to the upper side, And the connection pin is inserted into the first boss formed in another unit block adjacent to the second boss formed in any one unit block to connect the unit blocks.

Specifically, the band unit may further include a fixing member for tightening the unit blocks, which are rotatably connected to each other through the connecting pin, to the outer peripheral surface of the lower flask.

Specifically, the protruding portion is formed of stainless steel and may have a bar shape extending horizontally so as to be fitted in the air vent hole.

More specifically, a male screw may be formed on the projection, and a mounting hole may be provided on the unit block, on which a female screw is fastened to the inner circumferential surface of the unit block.

More specifically, the projection length of the protrusion fixedly mounted on the unit block may have the same length as the length of the air vent hole.

As described above, since the air vent hole can be prevented from being clogged by the molding sand or the rust during storage in the molding operation, it is easy to manage the air vent hole, Thereby making it possible to produce a work roll capable of minimizing bubble defects on the surface.

1 is a schematic view showing a mold for casting a political casting among the casting molds for work roll casting,
2 is a perspective view showing an air vent hole clogging prevention device according to the present invention, and
3 is a cross-sectional view showing the use state of the air vent hole clogging prevention device shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Work rolls used in the rolling process of steel mills are cast using centrifugal casting or political casting.

The political casting method of the above-described work roll casting method is a method of casting a work roll by injecting molten metal in a state where vertically stacked vertically divided molds are formed and then solidifying.

Fig. 1 is a schematic view of a mold for casting a work in a casting mold for work roll casting. The casting mold for casting is composed of a vertical cylindrical mold M forming the body A of the work roll to be cast, M to form top and bottom necks N1 and N2, respectively. The top and bottom flasks F1 and F2 form a top and bottom neck, respectively. And the mold for casting the molten metal further includes a molten metal injection part P for injecting the molten metal into the mold through the lower mold flask F2.

That is, after the lower mold flask F2, the mold M, and the upper mold flask F1 are sequentially placed, the molten metal is injected into the mold through the molten metal injecting section P, and then the molten metal is solidified Thereby producing a work roll.

On the other hand, in the lower mold flask F2, an air vent hole H for discharging the gas inside the mold is formed along the outer circumferential surface of the lower mold flask F2 when the work roll using the casting mold for stopping casting is used.

However, the above-described air vent hole H has a problem in that it is clogged by the molding sand during the molding work using the molding sand, and the air vent hole H is rusted when the lower flask F2 is stored.

2 and 3 illustrate an air vent hole clogging preventing apparatus according to the present invention. The air vent hole clogging preventing apparatus 100 according to the present invention includes a lower flask F2, A band portion 110 surrounding the outer circumferential surface, and a protrusion 130 fitted to the band portion 110 and fitted in the air vent hole H.

The band unit 110 includes a plurality of unit blocks 112 and a plurality of connection pins 116 connecting one unit block 112 and another adjacent unit block 112.

The unit blocks 112 are made of iron and are provided in the form of a vertical plate as shown. The first and second bosses 114a and 114b are integrally formed at one end and the other end of the unit block 112, respectively. The first boss 114a is formed to extend from the central portion of one end side of the unit block 112 to the upper side and the second boss 114b is extended from the center portion of the other end side of the unit block 112 to the lower side of the other end .

The unit block 112 thus formed is extended by a connecting pin 116 so as to have a predetermined length. The first boss 114a formed in another unit block 112 adjacent to the upper surface of the second boss 114b formed in any one unit block 112, One of the unit blocks 112 and the other unit block 112 are connected to the first boss 114a by inserting the connecting pin 116 into the second boss 114b and the first boss 114a which are in contact with each other, And is rotatably connected.

The band unit 110 further includes a fixing member 118 that fixes the unit blocks 112 rotatably connected to each other through the connecting pin 116 to the outer peripheral surface of the lower flask F2. The fixing member 118 is not limited to the fixing member 118 but may include a unit block 112 disposed at the foremost end among the unit blocks 112 connected by the connecting pin 116, A male buckle 120a fixedly mounted by a common rivet or the like, and an arm buckle 120b fixedly mounted on a normal rivet or the like on a unit block 112 disposed at the rear end.

The protrusion 130 is formed of stainless steel and has a bar shape extending horizontally so as to be fitted in the air vent hole H as shown in FIG. The protrusions 130 are fixedly mounted on the respective unit blocks 112. For this purpose, the unit blocks 112 are formed with mounting holes 122 through which the protrusions 130 are fixedly mounted. At this time, a female screw 126 is formed on the inner circumferential surface of the mounting hole 122 and a male screw 132 is fastened to the female screw 126 on the outer circumferential surface of the protrusion 130.

The projection length of the protrusion 130 fixedly mounted on each unit block 112 preferably has the same length as the length of the air vent hole H.

The air vent hole clogging chamber 100 according to the present invention thus formed has a band portion 110 surrounding the outer circumferential surface of the lower flask F2 and a band portion 110 attached to the band portion 110 and formed along the outer peripheral surface of the lower flask F2. By including the protrusion 130 fitted in the air vent hole H, it is possible to prevent the air vent hole from being clogged by molding sand or during rusting during molding.

The air vent hole clogging zone 100 is not limited to the construction and operation of the embodiments described above. The above embodiments may be configured so that all or some of the embodiments may be selectively combined to make various modifications.

100: air vent hole clogging zone 110: band portion
112: unit block 116: connection pin
130: protrusion

Claims (7)

A band portion surrounding the outer surface of the lower flask formed in the air vent hole; And
And a protrusion mounted on the band portion and fitted in the air vent hole,
The band-
A plurality of unit blocks having a vertical plate shape made of iron; And
And a plurality of connection pins connecting the unit blocks.
delete The method according to claim 1,
A first boss and a second boss are formed at one end and the other end of the unit block,
Wherein the first boss extends from the central portion of one end of the unit block toward the upper side and the second boss extends from the center of the other end of the unit block to the lower side of the other end,
Wherein the connecting pin is inserted into the first boss formed in another unit block adjacent to the second boss formed in any one of the unit blocks to connect the unit blocks.
The method according to claim 1,
Wherein the band unit further comprises a fixing member for tightening the unit blocks rotatably connected to the outer circumferential surface of the lower flask via the connection pin.
The method according to claim 1,
Wherein the protrusions are formed of stainless steel and have a bar shape extending horizontally so as to be inserted into the air vent holes.
The method of claim 5,
Wherein the protruding portion is formed with a male screw and the unit block is provided with a mounting hole having a female screw on an inner circumferential surface thereof to which the male screw is fastened.
The method according to claim 1,
Wherein a protruding length of the protrusion fixedly mounted on the unit block has a length equal to a length of the air vent hole.

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