CN213687809U

CN213687809U - Argon blowing stirrer of suspension smelting equipment

Info

Publication number: CN213687809U
Application number: CN202022413668.2U
Authority: CN
Inventors: 李佳; 李庚�
Original assignee: Baoji Huayu Dingzun Material Technology Co Ltd
Current assignee: Baoji Huayu Dingzun Material Technology Co Ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-07-13
Anticipated expiration: 2030-10-26

Abstract

The utility model discloses a suspension smelting equipment blows argon agitator, including vacuum furnace body, vacuum unit, high frequency power, still include action bars, puddler, connecting plate, stirring vane is last to be provided with more than one and to blow the argon mouth, action bars and puddler in set up the inflation channel, the inside connection cavity or the radiation channel who communicates inflation channel that sets up of connecting plate, inflation channel and blow argon mouth intercommunication. In the suspension smelting process, the stirrer of the utility model is inserted into the molten pool for mechanical stirring. The components of the alloy are fully uniform. In addition, argon can be blown to the molten pool, and the alloy liquid can be stirred more fully by bubbles. The utility model discloses can improve the homogeneity of alloy liquid by a wide margin, produce the purification effect to the alloy liquid to improve the efficiency of smelting production.

Description

Argon blowing stirrer of suspension smelting equipment

Technical Field

The utility model relates to a suspension smelting equipment's argon agitator that blows specifically is an argon agitator that blows that improves alloy composition homogeneity under vacuum electromagnetic suspension smelting condition belongs to metal melting equipment technical field.

Background

Vacuum electromagnetic suspension smelting (hereinafter referred to as "suspension smelting") is similar to vacuum induction smelting, and the smelting process is completed by heating metal by using an electromagnetic field in a vacuum or inert gas environment, and belongs to a smelting technology without gas pollution. The difference is that the suspension smelting technology also utilizes the electromagnetic suspension force to lead the metal melting pool to be in a suspension state in the crucible, thereby avoiding the pollution of crucible materials to liquid metal and being a more advanced smelting technology. In the suspension smelting technique, a split water-cooled copper crucible is used, the purpose of the split being to enable an electromagnetic field to enter the copper crucible to heat the material.

The suspension smelting technique has a significant drawback in that the bottom of the molten bath is still in soft contact with the bottom of the crucible, which results in a lower temperature at the bottom, which causes non-uniformity in the composition of the alloy ingot. In addition, in the suspension smelting, in order to increase the suspension force, a relatively high-frequency electromagnetic field is needed, and the high-frequency electromagnetic field reduces the electromagnetic stirring force, which is another reason for the non-uniform composition of the alloy.

In order to obtain uniform components after the alloy is smelted, the alloy ingot has to be remelted for multiple times, so that the smelting cost is greatly increased, and the production efficiency is greatly reduced. In order to realize uniform alloy components, remelting is generally carried out for 3 times, so that the low production efficiency greatly hinders the popularization of the suspension smelting technology to production enterprises.

Current patent ZL201922254838.4 provides a novel energy-conserving electric stove of casting, including furnace body, hot plate and driving motor, and it sets up the axis of rotation in the furnace body, and the surface of axis of rotation sets up the (mixing) shaft, drives axis of rotation and (mixing) shaft through the motor and rotates to stir the molten metal in the furnace body, increased the homogeneity of alloy. Although the stirring shaft can increase the homogeneity of the alloy liquid or the metal liquid to a certain extent, the stirring shaft cannot stir the alloy liquid sufficiently, the stirring effect is poor, and the homogeneity of the alloy liquid or the metal cannot be improved greatly.

Therefore, it is very important to provide a stirrer which can stir more uniformly under the condition of suspension smelting.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned prior art, an object of the utility model is to provide an improve alloy composition homogeneity under the suspension smelting condition, its homogenization that can realize alloy composition in a smelting heat does not need the repeated remelting of many heats.

The purpose of the utility model is realized through the following technical scheme.

The utility model provides a suspension smelting equipment's argon agitator that blows, includes vacuum furnace body, vacuum unit, high frequency power supply, the vacuum furnace body top sets up real empty room bell and the inside water-cooled copper crucible that is provided with the split, water-cooled copper crucible outside encircles induction coil and inside and is provided with the molten bath, the shock electric current of high frequency power supply output is carried the induction coil still includes action bars and stirring vane, the action bars passes real empty room bell and stretches out the higher authority of real empty room bell, the sealed cooperation of action bars and real empty room bell, be provided with the relief valve on the real empty room bell, stirring vane sets up the action bars lower extreme, be provided with more than one on the stirring vane and blow the argon mouth.

Preferably, still include the puddler, the puddler install in the action bars bottom, stirring vane installs in the lateral surface of puddler.

Preferably, the stirring device further comprises a connecting plate, and one or more than two stirring rods are arranged on the operating rod through the connecting plate.

Preferably, the stirring blades on the stirring rod are more than two and are uniformly distributed on the outer side surface of the stirring rod.

Preferably, the operating rod and the stirring rod are tubular, inflation channels are arranged in the operating rod and the stirring rod, the inflation channels in the operating rod and the stirring rod are communicated, an air valve for controlling the inflation channels to be opened and closed is arranged on the operating rod, and the top end of the operating rod is connected with an inert gas source.

Preferably, a connecting cavity or a radiation channel is arranged in the connecting plate, and the operating rod and the inflation channel in the stirring rod are communicated through the connecting cavity or the radiation channel.

Preferably, the side surface of the operating rod and/or the stirring rod is provided with a side surface opening communicated with the inflation channel; and/or the bottom end of the operating rod and/or the stirring rod is provided with a bottom end opening communicated with the inflation channel.

Preferably, part or all of the side openings communicate with the argon blowing port through a passage in the stirring blade.

Preferably, the stirring rod and the stirring blade are made of heat-resistant and erosion-resistant materials.

Preferably, the heat-resistant and erosion-resistant material is refractory metal or heat-resistant ceramic.

The utility model has the advantages that:

1. the utility model discloses a stirrer is provided with action bars, puddler, connecting plate, stirring vane, and stirring vane is last to be provided with and to blow the argon mouth, connects a plurality of puddlers through the connecting plate, sets up a plurality of stirring vane on every puddler, and abundant stirs alloy liquid or molten metal, and the setting of blowing the argon mouth can make the molten metal produce the vortex when blowing the argon mouth, further improves the stirring effect to improve the homogeneity and the smelting efficiency of alloy;

2. the utility model also sets a communicating channel in the operating rod, the connecting plate and the stirring rod, and blows argon to the alloy liquid in the molten pool through the channel, so that the metal liquid or the alloy liquid can be more fully stirred, compared with the prior art that homogenization can be realized only by remelting for many times, the scheme can improve the production efficiency and greatly reduce the production cost;

3. the stirrer of the utility model has the argon blowing function, can absorb gas by bubbles in the argon blowing process, and can bring impurities in a molten pool to the surface of alloy liquid to produce the purification effect on the alloy liquid.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic view of the three-dimensional structure of the present invention.

Fig. 2 is an explosion diagram of the present invention.

Fig. 3 is a schematic view of the structure of the stirrer without the stirring rod.

Fig. 4 is a schematic view of a stirrer with a single stirring rod.

Fig. 5 is a schematic diagram of a stirrer with a single stirring rod.

FIG. 6 is a schematic view of a multiple-stirring rod stirrer.

Fig. 7 is a schematic diagram of a stirrer structure with multiple stirring rods.

FIG. 8 is a schematic view of the stirring process without a stirrer.

Fig. 9 is a schematic view of a stirring process of the stirrer having the argon blowing function.

Wherein, the device comprises a water-cooled copper crucible, a 2-alloy molten pool, a 3-stirring rod, a 4-stirring blade, a 5-operating rod, a 6-vacuum chamber furnace cover, a 7-connecting plate, an 8-inflation channel, a 9-air valve, a 10-pressure release valve and 11-air bubbles.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The utility model discloses be applied to among the vacuum response suspension smelting equipment. As shown in fig. 1 to 6, according to an embodiment of the present invention, an argon blowing stirrer for a suspension smelting device is provided, which includes a vacuum furnace body, a vacuum unit, and a high-frequency power supply. A split water-cooled copper crucible 1 is arranged in the furnace body, and a molten pool 2 is arranged in the water-cooled copper crucible 1. The induction coil is arranged around the crucible, the oscillating current output by the high-frequency power supply is transmitted to the induction coil, and the generated electromagnetic field is utilized to heat the metal in the crucible.

The top of water-cooling copper crucible 1 is provided with the agitator, the agitator includes action bars 5 and stirring vane 4, stirring vane 4 sets up the lower extreme at action bars 5. During the stirring process, the operating rod 5 is positioned above the alloy molten pool 2, and the stirring blades 4 are positioned in the furnace body. In order to prevent the stirrer from polluting the alloy molten pool 2, the control rod 5 drives the stirrer to wholly lift and rotate, so that the stirrer is intermittently immersed into the alloy liquid or the molten metal to be stirred. Preferably, the operating rod 5 is made of stainless steel. A through hole is formed in the center of the vacuum chamber furnace cover 6, the operating rod 5 penetrates through the through hole and extends out of the vacuum chamber furnace cover 6, and the operating rod 5 is in sealing fit with the through hole.

Example 1:

as shown in fig. 3, in the present embodiment, the stirring blade 4 is directly attached to the lower end of the operating rod 5 without providing a stirring rod, and the stirring blade 4 is directly operated by the operating rod 5 to perform the lifting and rotating operations, thereby stirring the alloy liquid or the molten metal in the alloy molten pool 2 and further homogenizing the alloy liquid or the molten metal. In order to further increase the stirring effect, the stirring blade 4 is provided with an argon blowing port 41, and during stirring, the molten metal can form local turbulence through the argon blowing port 41, so that the stirring effect is enhanced, and the uniformity of the alloy is improved.

As shown in fig. 4, the stirrer is further provided with a stirring rod 3, the stirring rod 3 is installed at the bottom end of the operating rod 5, the stirring blades 4 are installed at the side surfaces of the stirring rod 3, and the number of the stirring blades 4 is more than one, preferably six, and is uniformly distributed on the outer side surface of the stirring rod 3. The setting up of puddler 3 has increased the stirring effect on the one hand, and on the other hand, the installation and the change of the agitator of being convenient for. The difference between the operating rod 5 and the stirring rod 3 is that the stirring rod 3 needs to be inserted into a molten pool, the operating rod 5 is arranged at the upper end of the stirring rod 3 and used for lifting and rotating the stirring rod 3, and the operating rod 5 is always positioned at the upper end of the molten pool, so that the pollution of the operating rod to the molten pool is avoided. Preferably, the operating rod 5 is made of stainless steel.

As shown in fig. 6, the stirrer is further provided with a connecting plate 7, the operating rod 5 and the stirring rods 3 are connected through the connecting plate 7, and the number of the stirring rods 3 is more than one. Further, each of the stirring rods 3 is provided with more than one stirring blade 4, and preferably, the number of the stirring blades 4 on each stirring rod 3 is six, as shown in fig. 7. In order to further improve the stirring effect, a plurality of stirring rods 3 are circumferentially distributed on the bottom surface of the connecting plate 7.

Example 2:

the operating rod 5 is of a pipeline structure, an inflation channel 8 is arranged inside the operating rod 5, and the operating rod 5 is provided with a bottom opening and/or a side opening on the side wall. An air valve 9 for controlling the opening and closing of the inflation channel 8 is arranged at the upper part of the operating rod 5. The top end of the operating rod 5 is connected with an inert gas source. When the operating rod 5 is controlled to descend discontinuously to enable the stirring rod 3 and the stirring blade 4 to be partially or completely immersed into the alloy molten pool 2, the gas valve 9 is opened to send inert gas into the gas charging channel 8 in the operating rod 5, so that the inert gas is blown into the molten pool 2 from the bottom opening of the operating rod 5 and/or the side opening of the operating rod 5 to form inert gas bubbles to stir the alloy liquid or the molten metal, and the stirring effect is further improved. Furthermore, part of the side openings of the operating rod 5 are communicated with the argon blowing port 41 on the stirring blade 4, and part of the inert gas is blown out from the argon blowing port 41 after passing through the connecting channel inside the stirring blade 4 through the side openings, so that the turbulence around the argon blowing port 41 is enhanced, and the alloy liquid and the metal liquid passing through the argon blowing port 41 are more uniform.

Further, the stirring rod 3 is a pipeline, an inflation channel 8 is arranged inside the stirring rod 3, and the inflation channel 8 between the stirring rod 3 and the operating rod 3 is communicated and hermetically connected. The stirring rod 3 is provided with a bottom end opening and/or a side opening. At this time, a part or all of the side openings of the stirring rod 3 communicate with the argon blowing port 41 on the stirring blade 4.

Further, the operating rod 5 and the stirring rod 3 are both internally provided with an inflation channel 8, and the connecting plate 7 is internally provided with a connecting cavity or a radiation channel. The operating rod 5 and the aeration channel 8 in the stirring rod 3 are communicated through a connecting cavity in the connecting plate 7 and/or a radiation channel.

Further, the inert gas is argon. For the suspension smelting equipment provided with the argon blowing stirrer, a pressure release valve 10 is also arranged on the furnace body, and the pressure release valve 10 is arranged on the furnace cover 6 of the vacuum chamber. When argon is blown and stirring is carried out, the gas pressure in the furnace body of the equipment is gradually increased, and when the pressure reaches a set value, the pressure release valve 10 can be automatically opened to release gas and release pressure. The pressure relief valve 10 may be an electromagnetic valve or a spring-type valve.

The stirring rod 3 and the stirring blade 4 are both made of heat-resistant materials, and the melting point of the stirring rod and the melting blade must be obviously higher than that of a smelting material. Preferably, the stirring rod 3 and the stirring blade 4 are made of refractory metal or refractory metal alloy, such as metal tungsten, molybdenum, niobium, titanium, zirconium, titanium and their alloys. For the alloy which is not sensitive to pollution and the alloy which has not very high melting point, the stirring rod 3 and the stirring blade 4 can also be made of other high temperature resistant materials, such as high temperature alloy, heat resistant steel, stainless steel, and heat resistant ceramic material. When the stirring rod 3 is provided, the operation rod 5 is not immersed in the alloy liquid, and may be made of carbon steel, stainless steel, or the like.

The agitator may be operated manually or automatically. For the automatic running stirrer, a motor for driving the operation rod 5 to ascend and descend and a motor for driving the operation rod 5 to rotate are required to be arranged, the running process is preferably controlled by a PLC module, each action is realized by a separate instruction, and the operation can also be realized by arranging a program control system. In the program control system, the time for starting the stirrer to descend, the position for staying above the crucible and the baking time, the time for descending into the molten pool, the number of revolutions and speed of stirring rotation, the time for lifting the stirrer and the like are preset. The stirring process can be unidirectional rotation, or can be forward rotation for a plurality of circles, then reverse rotation for a plurality of circles, and reciprocating rotation.

On the stirring blades 4 of the stirrer and at the lower end of the stirring rod 1, some solidified alloy material generally adheres. In order to prevent cross contamination when different alloys are melted, the same special stirrer can be used for the same alloy.

As shown in fig. 8 to 9, the stirring of the molten bath 2 by such a stirring device is as follows: when the alloy material in the water-cooled copper crucible 1 is melted, the stirrer is firstly lowered and is suspended above the molten pool to be baked to a higher temperature, so that the temperature of the molten pool 2 is prevented from being suddenly lowered after the stirrer is inserted. And then, lowering the stirrer into the molten pool, and carrying out short-time rotary stirring for about 5-60 seconds, wherein the rotation frequency in the stirring process is about 2-10 weeks. The length of stirring time and the number of revolutions of rotation are determined by the extent to which the stirrer material differs from the melting point of the alloy being melted and by the tendency of them to fuse with each other. The stirrer is prevented from being corroded by the molten alloy due to too long stirring time and too many rotation times. Immediately after stirring, the stirrer should be pulled up over the crucible. In a smelting heat, the stirrer can be used for stirring for multiple times, so that the alloy components in the molten pool are fully homogenized.

In a specific argon-free stirring example: 1kg of Ti-40% Al alloy was smelted. The equipment adopts a water-cooled copper crucible with the inner diameter of 60mm, and the height of the water-cooled copper crucible is 100 mm. The stirrer assembled above the water-cooled copper crucible adopts a stainless steel operating rod, a tungsten stirring rod and a tungsten stirring blade, the stirring blade is arranged at the lower end of the stirring rod, and the operating rod extends out of a furnace cover of a vacuum chamber through vacuum sealing. The water-cooled copper crucible is arranged in a vacuum melting chamber, and the equipment is provided with a 50kW high-frequency power supply.

The equipment is firstly vacuumized, the vacuum degree reaches 6.7 and 10 pumping is carried out^-3After Pa, high-purity argon of 0.06MPa is filled, and then a high-frequency power supply is started to heat the materials in the water-cooled copper crucible. After the material had melted, the stirrer was lowered to a height of about 2cm above the surface of the molten bath and baked for 20 seconds, and then the stirrer was inserted into the molten bath so that the stirring blades were close to the bottom of the water-cooled copper crucible. After the stirring blade is rotated rapidly for 5 weeks, the stirrer is lifted rapidly to return the stirring blade to a height of 2cm from the surface of the molten poolAnd (4) degree. After 30 seconds of dwell, the stirrer was inserted into the bath for stirring and then lifted. The mixture was stirred 3 times in the same manner as the first stirring, and finally the stirrer was raised back to the original height. And after continuing heating and smelting for 1 minute, turning off the high-frequency power supply, and solidifying the alloy liquid in the crucible.

In this embodiment, the molten alloy is solidified in a water-cooled copper crucible, which is performed for the purpose of facilitating analysis of compositional deviations at different portions of the ingot. Table 1 shows the data of the analysis performed by sampling from different parts of the alloy ingot. The results showed that the composition deviation of the top and bottom of the alloy ingot was 0.18 wt.% or less.

TABLE 1 analysis results of Ti-40% Al alloy ingot composition

In a specific argon-filled stirred example: 5kg of Ti-50% Al alloy was smelted. The equipment adopts a water-cooled copper crucible with the inner diameter of 120mm, and the height of the water-cooled copper crucible is 250 mm. The stirrer mounted above the water-cooled copper crucible adopts a stainless steel operating rod and a connector, 3 tungsten stirring rods and 3 tungsten blades. The operating rod and the stirring rod are made of pipe materials, 3 pipelines which are radially distributed are arranged in the disc-shaped connector from the center to the edge, the operating rod, the stirring rod and the pipelines in the connector are mutually communicated, and the joint is sealed. An upper end opening of the operating rod pipeline is provided with an air valve which is connected with a high-purity argon bottle. The lower end of the stirring rod is provided with an open opening. The water-cooled copper crucible is arranged in a vacuum melting chamber, a spring pressure release valve is arranged on a furnace cover, and the equipment is provided with a 200kW high-frequency power supply.

The equipment is firstly vacuumized, the vacuum degree reaches 6.7 and 10 pumping is carried out^-3After Pa, high-purity argon of 0.06MPa is filled, and then a high-frequency power supply is started to heat the materials in the crucible. After the materials are melted, the stirrer is lowered to a height of about 3cm above the surface of the molten pool for baking, after 20 seconds of baking, an argon filling valve is opened, high-purity argon of 0.15MPa is introduced into the stirrer, and argon flow is blown out from the lower end of the stirring rod. Then the stirrer is inserted into the molten pool, the stirring blade is close to the bottom of the crucible to start rotating and stirring,while continuing to blow argon (figure 6). After 8 weeks of rapid rotation, the stirrer was rapidly lifted to bring the stirring blade back to a height of 3cm from the surface of the molten pool. After a residence time of 40 seconds, the stirrer was inserted into the bath again for stirring and then lifted again. The same operation as the first stirring was followed for a total of 4 times and finally the stirrer was raised back to its original height. And after continuing heating and smelting for 2 minutes, turning off the high-frequency power supply to solidify the alloy liquid in the crucible.

The composition of different parts of the alloy ingot was analyzed, and table 2 shows the data of the analysis of the alloy ingot sampled from different parts. The analysis result shows that the composition deviation of the top and the bottom of the alloy ingot is less than or equal to 0.28 wt.%.

TABLE 2 analysis results of Ti-50% Al alloy ingot composition

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an argon blowing stirrer of suspension smelting equipment, includes vacuum furnace body, vacuum unit, high frequency power supply, the vacuum furnace body top sets up real empty room bell (6) and inside water-cooling copper crucible (1) that is provided with the split, water-cooling copper crucible (1) outside is encircleed induction coil and inside and is provided with molten bath (2), the oscillation current of high frequency power supply output is carried induction coil, its characterized in that: still include action bars (5) and stirring vane (4), action bars (5) pass real empty room bell (6) and stretch out to the higher authority of real empty room bell (6), action bars (5) and real empty room bell (6) are sealed to be cooperated, be provided with relief valve (10) on real empty room bell (6), stirring vane (4) set up action bars (5) lower extreme, be provided with more than one on stirring vane (4) and blow argon mouth (41).

2. The argon-blowing stirrer according to claim 1, characterized in that: still include puddler (3), puddler (3) install in action bars (5) bottom, stirring vane (4) install in the lateral surface of puddler (3).

3. The argon-blowing stirrer according to claim 2, characterized in that: still include connecting plate (7), one or two more puddlers (3) pass through connecting plate (7) are installed on action bars (5).

4. An argon-blowing stirrer according to claim 2 or 3, characterized in that: the stirring blades (4) on the stirring rod (3) are more than two and are uniformly distributed on the outer side surface of the stirring rod (3).

5. The argon-blowing stirrer according to claim 2, characterized in that: the device is characterized in that the operating rod (5) and the stirring rod (3) are tubular and are internally provided with an inflation channel (8), the inflation channel (8) in the operating rod (5) and the stirring rod (3) are communicated, an air valve (9) for controlling the inflation channel (8) to be opened and closed is arranged on the operating rod (5), and the top end of the operating rod (5) is connected with an inert gas source.

6. The argon blowing stirrer according to claim 3, characterized in that: a connecting cavity or a radiation channel is arranged in the connecting plate (7), and the operating rod (5) is communicated with an inflation channel (8) in the stirring rod (3) through the connecting cavity or the radiation channel.

7. The argon blowing stirrer according to claim 3, characterized in that: the side surface of the operating rod (5) and/or the side surface of the stirring rod (3) are/is provided with side surface openings communicated with the inflation channel (8); and/or the bottom end of the operating rod (5) and/or the bottom end of the stirring rod (3) are provided with bottom end openings communicated with the inflation channel (8).

8. The argon-blowing stirrer according to claim 7, characterized in that: part or all of the side openings communicate with the argon blowing port (41) through passages in the stirring blade (4).

9. The argon-blowing stirrer according to claim 2, characterized in that: the stirring rod (3) and the stirring blades (4) are made of heat-resistant and corrosion-resistant materials.

10. The argon-blowing stirrer according to claim 9, characterized in that: the heat-resistant and erosion-resistant material is refractory metal or heat-resistant ceramic.