Gear steel smelting base

Abstract

The utility model relates to a gear steel smelting base which comprises a mold, a middle injection pipe, a large base plate, a second base plate, an air conveying pipe and an air brick. The mold is provided with a forming cavity, and casting powder is arranged in the forming cavity. The two base plates are provided with liquid injection ports, the liquid injection ports are communicated with the forming cavity, air bricks are arranged outside the liquid injection ports, and the air delivery pipe is communicated with the air bricks through the two base plates; and the middle injection pipe is communicated with the liquid injection port through the large chassis. The gear steel smelting device has the advantages of being low in cost, easy and convenient to operate, capable of effectively taking out impurities in gear steel and suitable for smelting of large-size and high-purity gear steel.

Description

Technical Field

[0001] The utility model relates to the technical field of gear steel production, in particular to a smelting base for gear steel. Background Art

[0002] In the field of smelting high-purity and high-fatigue-life steel for gears, there will inevitably be particulate inclusions in the molten steel in the refining furnace. When the molten steel is formed in the mold, many inclusions will naturally float in the molten steel, but the floating speed is extremely slow, resulting in many impurities in the finished gear steel, which greatly affects the performance of the gear steel. In order to remove the impurities in the molten steel, the existing method is to add an electromagnetic stirring device to the smelting equipment, but the electromagnetic stirring will affect the smelting efficiency, the cost is relatively high, and the effect of removing impurities is not good. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a smelting base for gear steel, which can effectively remove the impurities in the gear steel.

[0004] To achieve the above-mentioned utility model purpose, the utility model provides a smelting base for gear steel, including a mold, a tundish, a large chassis, a second chassis, an air supply pipe, and a porous plug;

[0005] The mold is provided with a forming cavity, and a protective slag is arranged in the forming cavity;

[0006] The second chassis is located at the bottom of the mold. The second chassis is provided with a liquid injection port, the liquid injection port is communicated with the forming cavity, a porous plug is arranged outside the liquid injection port, and the air supply pipe is communicated with the porous plug through the second chassis;

[0007] The large chassis is located at the bottom of the second chassis, and the tundish is communicated with the liquid injection port through the large chassis.

[0008] As a further improvement of the utility model, a protective cover is arranged at the liquid inlet of the tundish.

[0009] As a further improvement of the utility model, the large chassis and the second chassis are integrally formed stepped seats.

[0010] As a further improvement of the utility model, there are several porous plugs, and each porous plug is arranged outside the liquid injection port in an annular array, and each porous plug is communicated with the air supply pipe.

[0011] A gear steel smelting base of the present utility model transmits the molten steel of the refining furnace through the middle pouring tube. The large chassis plays a connecting role for the middle pouring tube, enabling the molten steel to enter from the bottom of the mold along the large chassis. Compared with the molten steel entering from the side of the mold, entering from the bottom of the mold is convenient for forming and demolding. When the molten steel passes through the liquid injection port of the second chassis, the gas transmission pipe connected to it conveys argon gas. The introduced argon gas enters the molten steel and enters the forming cavity together with the molten steel. After the argon gas is introduced into the molten steel, many small argon gas bubbles are generated. When the particulate inclusions in the molten steel encounter the small bubbles, the internal pressure of the bubbles is lower than that of the molten steel, and the particulate inclusions will enter the bubbles and quickly float to the surface along with the bubbles and melt into the protective slag, achieving the purpose of purifying the molten steel. Among them, the porous plug transmits argon gas through the narrow slit of the porous plug core, having the advantages of high thermal strength and no steel penetration, ensuring that the gas transmission pipe will not be blocked or damaged due to the penetration of molten steel during the steelmaking process.

[0012] The advantages of a gear steel smelting base of the present utility model compared with the prior art are as follows:

[0013] It has a lower cost, is easy to operate, and can effectively remove impurities in the gear steel, and is suitable for the smelting of large-size and high-purity gear steel. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a gear steel smelting base of the present utility model. Detailed Embodiments

[0015] The following further details the detailed embodiments of the present utility model with reference to the drawings.

[0016] As Figure 1 shown, a gear steel smelting base of the present utility model includes a mold 1, a middle pouring tube 2, a large chassis 3, a second chassis 4, a gas transmission pipe 5, and a porous plug 6;

[0017] The mold 1 is provided with a forming cavity 11, and a protective slag 12 is provided in the forming cavity 11;

[0018] The second chassis 4 is located at the bottom of the mold 1. The second chassis 4 is provided with a liquid injection port 41. The liquid injection port 41 is communicated with the forming cavity 11. A porous plug 6 is provided outside the liquid injection port 41. The gas transmission pipe 5 is communicated with the porous plug 6 through the second chassis 4;

[0019] The large chassis 3 is located at the bottom of the second chassis 4. The middle pouring tube 2 is communicated with the liquid injection port 41 through the large chassis 3.

[0020] A smelting base for gear steel of the present utility model transmits the molten steel of the refining furnace 7 through the downsprue 2. The large chassis 3 plays a connecting role for the downsprue 2, enabling the molten steel to enter from the bottom of the mold 1 along the large chassis 3. Compared with the molten steel entering from the side of the mold 1, entering from the bottom of the mold 1 is convenient for forming and demolding. When the molten steel passes through the liquid injection port 41 of the second chassis 4, the gas transmission pipe 5 connected thereto conveys argon gas. The introduced argon gas enters the molten steel and enters the forming cavity 11 together with the molten steel. After the argon gas is introduced into the molten steel, a lot of small argon gas bubbles are generated. When the particulate inclusions in the molten steel encounter the small bubbles, the internal pressure of the bubbles is lower than that of the molten steel, and the particulate inclusions will enter the bubbles and quickly float to the surface along with the bubbles and merge into the protective slag 12, achieving the purpose of purifying the molten steel. Among them, the porous plug 6 transmits argon gas through the narrow slit of the porous plug core, and has the advantages of high thermal strength and no steel leakage, ensuring that the gas transmission pipe 5 will not be blocked or damaged due to the penetration of molten steel during the steelmaking process.

[0021] A protective cover 21 is provided at the liquid inlet of the downsprue 2 to prevent the high-temperature molten steel from leaking out from the connection between the downsprue 2 and the refining furnace 7.

[0022] The large chassis 3 and the second chassis 4 are an integrally formed stepped seat. Compared with the split structure, the integral structure can avoid the overflow of molten steel caused by the gap between the large chassis 3 and the second chassis 4.

[0023] There are several porous plugs 6, and each porous plug 6 is arranged in an annular array outside the liquid injection port 41. Each porous plug 6 is connected to a gas transmission pipe 5. Compared with the single-pipe gas transmission, the annular array arrangement can enable the argon gas to fully contact the molten steel, and the effect of extracting impurities is better, avoiding the situation that the molten steel flows too fast to be reunited with the argon gas.

[0024] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A gear steel smelting base, characterized in that, It includes a mold, a middle runner, a large chassis, a second chassis, a gas transmission pipe, and a porous plug; The mold is provided with a molding cavity, and a powder mold flux is arranged in the molding cavity; The second chassis is located at the bottom of the mold. The second chassis is provided with a liquid injection port which is communicated with the molding cavity. A porous plug is arranged outside the liquid injection port, and the gas transmission pipe is communicated with the porous plug through the second chassis; The large chassis is located at the bottom of the second chassis, and the middle runner is communicated with the liquid injection port through the large chassis.

2. The smelting base of a kind of gear steel as described in claim 1, characterized in that, A protective cover is arranged at the liquid inlet of the middle runner.

3. A gear steel smelting base according to claim 1, characterized in that The large chassis and the second chassis are an integrally formed stepped base.

4. A gear steel smelting base according to claim 1, characterized in that, There are several porous plugs, and each porous plug is arranged outside the liquid injection port in an annular array manner, and each porous plug is communicated with the gas transmission pipe.

Images