CN114799085A - Cavity exhaust device and exhaust method for slag ladle casting - Google Patents

Abstract

The invention discloses a cavity exhaust device for slag ladle casting, wherein a cavity is arranged in an inner mud core, and a hollow steel mould with air outlet holes on the top wall and the peripheral side walls is filled in the cavity, so that on one hand, the exhaust of gas generated by heating core sand of the mud core in the casting process is facilitated, on the other hand, the consumption and consumption of the core sand are reduced, the sand output during sand cleaning is reduced, the material is saved, and the cost is reduced; in addition, set up the blast pipe in the inside of steel mould to be connected the blast pipe with the air exhauster, can effectively solve the too high problem of the inside atmospheric pressure of steel mould, form certain negative pressure in the inside of steel mould simultaneously, be favorable to guiding the core sand of mud core and be heated the gaseous discharge that produces, at the pouring in-process, can not take place the gas explosion phenomenon, thereby avoided causing the foundry goods to produce casting defects such as sand inclusion, succulence, improved the quality of foundry goods.

Description

Cavity exhaust device and exhaust method for slag ladle casting

Technical Field

The invention relates to the technical field of casting, in particular to a cavity exhaust device and an exhaust method for ladle casting.

Background

The carbon steel slag ladle is a common casting required by various smelting manufacturers and is used for containing materials such as steel slag or ice copper slag and the like. The manufacturing material is universal low-carbon steel, and the selection of the casting process parting surface is generally divided into two types: one is a structure with an upward bag opening, and the other is a structure with a downward bag opening.

The casting process adopting the bag opening upward structure has the advantages that the cavity is simple to exhaust, the core hanging process of the mud core in the inner cavity is complex, the mud core and the upper box are required to be connected into a whole, the painting is difficult under the condition that the upper box is not turned, and the painting can only be adopted, so that the painting is wasted.

The casting process adopting the bag opening downward structure has the advantages that the inner cavity mud core can be directly connected with the bottom box, the box turning is not needed, the coating is easy to coat, and the only defect is that the exhaust of the inner cavity mud core needs to be discharged through the bottom, if the exhaust is not smooth, the gas explosion phenomenon is easy to cause, and then the local damage is formed on the surface of the sand mold of the inner cavity mud core, so that the casting has casting defects of sand inclusion, fleshiness and the like.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings of the prior art, and provides a cavity exhaust device and an exhaust method for ladle casting, which are used for avoiding the occurrence of gas explosion phenomenon, avoiding casting defects of sand inclusion, fleshiness and the like of castings and improving the quality of the castings.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a cinder ladle is cast with die cavity exhaust apparatus, includes sand box, outside mud core, inboard mud core and is located the die cavity between outside mud core and the inboard mud core, its characterized in that: the inside of inboard mud core is equipped with the cavity, the cavity in be equipped with the hollow steel mould of filling the cavity, be equipped with a plurality of venthole on the roof of steel mould and the lateral wall all around respectively, the inside of steel mould is equipped with the blast pipe, the blast pipe follow the bottom of inboard mud core is drawn forth and is connected with the air exhauster.

Furthermore, the outline of the steel die is matched with the shape of the cavity, the steel die is in a frustum shape with a small top and a big bottom, the top end and the periphery of the steel die are closed, and the bottom end of the steel die is open.

Furthermore, the exhaust pipe comprises a vertical pipe and a transverse pipe which are connected, the vertical pipe is positioned inside the steel die, and the side wall of the vertical pipe is respectively connected with a plurality of branch pipes which are arranged in a staggered manner; the free end of the transverse pipe is led out from the bottom of the inner mud core.

Furthermore, the exhaust pipe is a steel pipe.

A method for exhausting a cavity for slag ladle casting is characterized by comprising the following steps: the method specifically comprises the following steps:

s1, designing an outer mud core and an inner mud core according to the shape and the size of a slag ladle, arranging a cavity in the inner mud core, and filling the steel mould into the cavity;

s2, pre-burying the transverse pipe at the bottom of the inner side mud core, so that the vertical pipe and the plurality of branch pipes respectively extend into the steel mould, the free end of the transverse pipe is led out from the bottom of the inner side mud core, and then the free end of the transverse pipe is connected with the exhaust fan;

s3, after the box is closed, forming a cavity matched with the shape and the size of the slag bag between the outer side mud core and the inner side mud core;

s4, opening the exhaust fan, then pouring, wherein in the pouring process, gas generated by heating core sand of the outer mud core and the inner mud core enters the interior of the steel die through the plurality of air outlet holes, then enters the vertical pipe and the plurality of branch pipes, and finally is discharged through the horizontal pipe;

and S5, after the pouring is finished for 20-30 minutes, closing the exhaust fan.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the cavity is arranged in the inner mud core, the cavity is filled with the hollow steel die with the air outlet holes on the top wall and the peripheral side walls, so that on one hand, the air generated by heating the core sand of the mud core in the pouring process is favorably discharged, on the other hand, the using amount and consumption of the core sand are favorably reduced, the sand output in sand cleaning is reduced, the material is saved, and the cost is reduced.

2. According to the invention, the exhaust pipe is arranged in the steel mould and is connected with the exhaust fan, so that the problem of overhigh air pressure in the steel mould can be effectively solved, meanwhile, a certain negative pressure is formed in the steel mould, so that the exhaust of gas generated by heating core sand of the mud core is favorably guided, and the gas explosion phenomenon can not occur in the pouring process, thereby avoiding the casting defects of sand inclusion, fleshiness and the like of a casting and improving the quality of the casting.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of a steel mold according to the present invention.

FIG. 3 is a schematic view of the exhaust pipe according to the present invention.

Fig. 4 is a schematic structural view of a casting of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a die cavity exhaust apparatus for slag ladle casting, including sand box 1, outside mud core 2, inboard mud core 3 and the die cavity 4 that is located between outside mud core 2 and the inboard mud core 3, the inside of inboard mud core 3 is equipped with the cavity, be equipped with the hollow steel mould 5 of filling the cavity in the cavity, be equipped with a plurality of venthole 6 on the roof of steel mould 5 and the lateral wall all around respectively, the inside of steel mould 5 is equipped with blast pipe 7, blast pipe 7 is drawn forth and is connected with the air exhauster (not shown in the figure, the same below) from the bottom of inboard mud core 3.

In the invention, the outline of the steel die 5 is matched with the shape of the cavity, and the steel die is in a frustum shape with a small top and a big bottom, the top end and the periphery of the steel die are closed, and the bottom end of the steel die is open. From this, after steel mould 5 fills to the cavity, the outside roof of steel mould 5 and outer wall all around can closely laminate with the chamber wall of cavity, play fine supporting role to inside mud core 3 to form the enough space that is favorable to gaseous entering in the inside of steel mould 5.

In the invention, the exhaust pipe 7 comprises a vertical pipe 71 and a horizontal pipe 72 which are connected, the vertical pipe 71 is positioned inside the steel die 5, and the side wall of the vertical pipe 71 is respectively connected with three branch pipes 73 which are arranged in a staggered manner; the free end of the horizontal pipe 72 is led out from the bottom of the inner mud core 3. Thereby facilitating rapid suction of gas into the interior of the steel mould 5.

In the invention, the exhaust pipe 7 is a steel pipe, and is high temperature resistant and corrosion resistant.

A method for exhausting a cavity for slag ladle casting specifically comprises the following steps:

s1, designing an outer mud core 2 and an inner mud core 3 according to the shape and the size of a slag ladle, arranging a cavity in the inner mud core 3, and filling a steel mould 5 into the cavity;

specifically, the thickness of the steel die 5 is 100-140mm, and the steel die is convenient for saving materials and processing and manufacturing on the basis of having enough supporting strength.

S2, pre-burying a horizontal pipe 72 at the bottom of the inner-side mud core 3, enabling a vertical pipe 71 and three branch pipes 73 to extend into the steel mould 5 respectively, leading a free end of the horizontal pipe 72 out of the bottom of the inner-side mud core 3, and connecting the free end of the horizontal pipe 72 with an exhaust fan;

specifically, the top end of the vertical pipe 71 is 600mm away from the top wall of the steel die 5, and the front ends of the three branch pipes 73 are 600mm away from the peripheral side walls of the steel die 5, so that the rapid gas suction is facilitated.

And S3, after the box is closed, a cavity 4 matched with the shape and size of the slag ladle is formed between the outer mud core 2 and the inner mud core 3.

And S4, opening an exhaust fan, pouring, wherein in the pouring process, gas generated by heating core sand of the outer mud core 2 and the inner mud core 3 enters the steel die 5 through a plurality of air outlets 6, then enters a vertical pipe 71 and three branch pipes 73, and finally is discharged through a horizontal pipe 72.

S5, after the pouring is finished for 20 minutes, the exhaust fan is closed, so that the gas can be completely extracted.

The invention is further described below with reference to the accompanying drawings:

in the pouring process, core sand of the mud core (the outer mud core 2 and the inner mud core 3) is continuously heated to generate a large amount of gas, wherein one part of the gas enters the cavity 4 through the surface of the core sand of the mud core, and the other part of the gas enters the steel die 5 through the plurality of gas outlet holes 6.

After the molten steel is gradually filled in the whole cavity 4, the gas generated by the mud core can only enter the steel die 5 through the plurality of gas outlet holes 6, at the moment, the gas in the steel die 5 is heated and rapidly expands to form certain gas pressure, and the gas is discharged only under certain pressure. At a certain time node, the gas pressure inside the steel mold 5 reaches a certain peak instantly, and the gas generated by the mud core cannot completely enter the steel mold 5, so that the gas rushes into the molten steel inside the cavity 4, the casting 8 has casting defects of sand inclusion, fleshiness and the like, and the local position of the mud core is damaged.

Because the air suction pump is started before pouring, the problem that the internal air pressure of the steel die 5 is too high can be effectively solved, meanwhile, a certain negative pressure is formed inside the steel die 5, so that the air is guided to be discharged through the vertical pipe 71, the three branch pipes 73 and the transverse pipe 72, and the air explosion phenomenon can not occur in the pouring process, so that the casting defects of sand inclusion, fleshiness and the like of the casting 8 are avoided, the quality of the casting 8 is improved, and meanwhile, the local position of the mud core can not be damaged.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (5)

1. The utility model provides a cinder ladle is cast with die cavity exhaust apparatus, includes sand box, outside mud core, inboard mud core and is located the die cavity between outside mud core and the inboard mud core, its characterized in that: the inside of inboard mud core is equipped with the cavity, the cavity in be equipped with the hollow steel mould of filling the cavity, be equipped with a plurality of venthole on the roof of steel mould and the lateral wall all around respectively, the inside of steel mould is equipped with the blast pipe, the blast pipe follow the bottom of inboard mud core is drawn forth and is connected with the air exhauster.

2. The exhaust device for the cavity for the slag ladle casting according to claim 1, wherein: the outline of the steel die is matched with the shape of the cavity, is in a frustum shape with a small top and a big bottom, and has a closed top end and periphery and an open bottom end.

3. The exhaust device for the cavity for the slag ladle casting according to claim 1, wherein: the exhaust pipe comprises a vertical pipe and a transverse pipe which are connected, the vertical pipe is positioned inside the steel die, and the side wall of the vertical pipe is respectively connected with a plurality of branch pipes which are arranged in a staggered manner; the free end of the transverse pipe is led out from the bottom of the inner mud core.

4. The exhaust device for the cavity for the slag ladle casting according to claim 3, wherein: the exhaust pipe is a steel pipe.

5. The method for exhausting the cavity for the ladle casting based on the exhaust device according to any one of claims 1 to 4 is characterized by comprising the following steps:

s1, designing an outer mud core and an inner mud core according to the shape and the size of a slag ladle, arranging a cavity in the inner mud core, and filling the steel mould into the cavity;

s2, pre-burying the transverse pipe at the bottom of the inner side mud core, so that the vertical pipe and the plurality of branch pipes respectively extend into the steel mould, the free end of the transverse pipe is led out from the bottom of the inner side mud core, and then the free end of the transverse pipe is connected with the exhaust fan;

s3, after the box is closed, forming a cavity matched with the shape and the size of the slag bag between the outer side mud core and the inner side mud core;

s4, opening the exhaust fan, then pouring, wherein in the pouring process, gas generated by heating core sand of the outer mud core and the inner mud core enters the interior of the steel die through the plurality of air outlet holes, then enters the vertical pipe and the plurality of branch pipes, and finally is discharged through the horizontal pipe;

and S5, after the pouring is finished for 20-30 minutes, closing the exhaust fan.

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