CN212371160U - Circular truncated cone type riser pulse magnetic oscillation processing device - Google Patents
Circular truncated cone type riser pulse magnetic oscillation processing device Download PDFInfo
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- CN212371160U CN212371160U CN202020920441.4U CN202020920441U CN212371160U CN 212371160 U CN212371160 U CN 212371160U CN 202020920441 U CN202020920441 U CN 202020920441U CN 212371160 U CN212371160 U CN 212371160U
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Abstract
The utility model discloses a round platform type rising head pulse magnetic induced oscillation processing apparatus, the device by pulse power supply (1), conductor (2), refractory material (3), ingot casting (4), round platform type coil (5), coil shaping fixed bolster (6), casting mould (7) are constituteed. The coil forming fixing support (6) is made of mullite with high hardness and high temperature resistance, the truncated cone-shaped coil (5) is wound on the coil forming fixing support (6), the refractory material (3) is embedded, the whole truncated cone-shaped coil dead head is placed on the casting mold (7), and the pulse power supply (1) is connected with the truncated cone-shaped coil (5) through the conductor (2). Pulse current generated by the pulse power supply (1) enters the truncated cone-shaped coil (5) through the conductor (2) to be excited out to act on the cast ingot (4) through a pulse magnetic field, so that the purposes of refining and homogenizing the cast ingot solidification structure are achieved.
Description
Technical Field
The utility model relates to a round platform type rising head pulse magnetic induced oscillation processing apparatus belongs to metal solidification structure control and equips technical field.
Background
Ingot defects become increasingly apparent as weight increases. Because the volume is large, the heat dissipation of the cast ingot is slow, and thick dendrites can appear in the cast ingot. Meanwhile, as the solidification is continuously carried out, the distribution of the solute in the whole ingot is different: at present, aiming at solving the problem of ingot casting uniformity, positive segregation of a feeder head, V-shaped segregation at the center, A-shaped segregation at a half radius and negative segregation at the bottom, in addition to applying a chemical reagent containing alloy elements and adopting physical methods such as vibration, ultrasonic waves, electromagnetic fields and the like, many researches are made for solving the problem of ingot casting homogenization. For cast ingots, the control of the solidification process is the best solution for the transformation of dendrites into equiaxed crystals and the uniform distribution of solutes. If the ingot with uniform solidification structure and light macrosegregation can be directly cast, the subsequent processing procedures can be greatly reduced.
Riser pulse Magneto-oscillation (HPMO) is a new solidification homogenization technology derived from PMO technology and applied to large ingot production, and pulse current is introduced into an induction coil wound outside a riser, so that a specific electromagnetic effect is formed in molten steel at the front edge of the riser, molten steel nucleation is promoted, crystal rain is formed, and the purposes of refining the whole ingot solidification structure and reducing segregation are achieved. In the research, the cylindrical riser adopted by the large-sized cast ingot has a good feeding effect, but the material yield is low, and due to the fact that the pulse magnetic field is attenuated quickly, the magnetic oscillation is difficult to act on the central part of the riser, and the final solidification region of the cast ingot cannot be effectively treated.
Disclosure of Invention
Utility model purpose: to above problem, the utility model provides a convenient operation, the homogenization effect is showing, safe and reliable's round platform type rising head pulse magnetic oscillation processing apparatus to control ingot casting solidification process obtains the solidification structure of homogenization, solves current large-scale ingot casting "V" type segregation serious with shrinkage porosity, shrinkage cavity and the thick waiting solidification problem of tissue.
For realizing the purpose of the utility model, the utility model adopts the technical proposal that: a pulse magnetic oscillation processing device for a truncated cone-shaped riser comprises a pulse power supply, a conductor, a refractory material, an ingot, a truncated cone-shaped coil, a coil forming fixing support and a casting mold. The coil forming fixing support is made of materials such as mullite with high hardness and high temperature resistance, the truncated cone-shaped coil is wound on the coil forming fixing support, then the refractory materials are embedded, the whole truncated cone-shaped coil dead head is placed on a casting mold, and the pulse power supply is connected with the truncated cone-shaped coil through a conductor. Pulse current generated by the pulse power supply enters the truncated cone-shaped coil through the conductor to excite a pulse magnetic field to act on the ingot, so that the aim of solidification and homogenization of the ingot is fulfilled. Under the treatment of the device, two circulations in opposite directions are formed in the ingot, the standard deviation extreme value of solute and the standard deviation of components are obviously reduced, and the amplitude reduction can reach 53.1%.
The circular truncated cone type coil is wound by a copper pipe, the copper pipe is wound by a polyimide film in a sealing mode before winding, the wound coil is embedded into a coil forming fixing support, and the coil forming fixing support needs to be in direct contact with a high-temperature metal melt, so that the coil forming fixing support needs to be made of a high-temperature-resistant material with good strength, such as mullite.
According to the truncated cone-shaped riser pulse magnetic oscillation processing device, in order to avoid damage of a truncated cone-shaped coil due to high-temperature radiation of molten metal and self induction heating, the coil is made of a copper pipe, and cooling liquid is introduced into the copper pipe for cooling during working.
The device for processing the circular truncated cone type riser pulse magnetic oscillation achieves the purposes of improving the solidification structure and macrosegregation of the cast ingot by applying the pulse magnetic oscillation to the cast ingot at the circular truncated cone type riser. In order to improve the treatment effect, the distance from the inner side of the circular truncated cone coil to the liquid level of the metal melt is as follows: 5 mm-150 mm, wherein the optimal treatment effect is that the ratio of the height of the truncated cone-shaped coil to the thickness of the coil forming fixed support is 5: 1.
in the circular truncated cone type riser pulse magneto oscillation processing device, in order to excite different magnetic field forms in the ingot, the current waveform output by the pulse power supply can be pulse alternating current, pulse square wave and pulse triangular wave, and the output mode is single pulse or double pulse. Meanwhile, according to different sizes of the cast ingots, the parameters of the pulse power supply are as follows: the discharge voltage is 5V-1500V, the output frequency is 1 Hz-1300 Hz, and the duty ratio is 0.5-55.
In the circular truncated cone type riser pulse magnetic oscillation processing device, the circular truncated cone type coil riser is squat on a casting mould, and in the processing process, in order to prevent a metal melt from seeping out from a gap between the riser and an ingot to cause a dangerous accident, the gap needs to be sealed before processing.
The device operation process is as follows: before pouring, the truncated cone-shaped coil dead head is squat on a casting mold, a gap between the dead head and an ingot is sealed, then high-temperature metal melt is poured into the casting mold from a pouring gate above a coil forming fixing support, after pouring is completed, a pulse power supply is started, pulse current generated by the pulse power supply enters the truncated cone-shaped coil through a conductor to excite a pulse magnetic field to act on the ingot, and the purpose of homogenizing the solidification structure of the ingot is achieved.
Has the advantages that: compared with the prior art, the technical scheme of the utility model following beneficial technological effect has:
1. the utility model discloses can show solidification structure and the segregation that improves metal material.
2. The utility model discloses simple structure, the operation is more convenient.
3. The electromagnetic energy utilization efficiency is high, and the metal liquid surface can also receive good electromagnetic effect in the solidification and contraction process.
4. The method has no pollution, and because the pulse magnetic oscillation effect does not directly contact with the melt, the cast ingot can not be polluted, and the environment can not be polluted.
5. The utility model discloses a device has exert the advantage that round platform type coil concentrates the electromagnetic energy in rising head department, and the circulation of formation is favorable to the equiaxial crystal to subside the ingot casting bottom, has refined the ingot casting solidification structure effectively, improves ingot casting solute distribution uniformity to be favorable to improving the ingot casting yield.
Drawings
Fig. 1 is a schematic diagram of a circular truncated cone type riser pulse magnetic oscillation processing device.
Fig. 2 is a schematic view of a circular truncated cone type coil.
FIG. 3 shows the flow field distribution in the ingot under the pulsed magnetic oscillation treatment of the truncated cone-shaped riser.
FIG. 4 is a segregation index and a comparison curve of Si element in the ingot solidification structure and the axial direction under the treatment of the frustum type riser pulse magnetic oscillation.
In the figure: 1. the casting mold comprises a pulse power supply, 2 conductors, 3 refractory materials, 4 ingots, 5 circular truncated cone-shaped coils, 6 coil forming fixing supports and 7 casting molds.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
The device comprises a pulse power supply 1, a conductor 2, a refractory material 3, an ingot 4, a truncated cone-shaped coil 5, a coil forming fixing support 6 and a casting mould 7. The truncated cone-shaped coil 5 is formed by winding a copper pipe, is embedded into the coil forming fixing support 6, is embedded into the refractory material 3, and is squat on the casting mould 7. The pulse power source 1 is connected to a circular truncated cone-shaped coil 5 via a conductor 2. Pulse current generated by the pulse power supply 1 enters the circular truncated cone-shaped coil 5 through the conductor 2 to excite a pulse magnetic field to act on the ingot 4, and the magnetic field forms two circulations in opposite directions in the ingot, so that favorable conditions are created for more crystal nuclei to fall to the bottom of the ingot; the processing power is increased, and the uniformity of the Al-3% Si alloy cast ingot solidification structure is improved; the solute distribution at the central axis of the ingot is more uniform by the pulse magneto oscillation treatment of the circular truncated cone-shaped riser, the standard deviation extreme value of the solute is reduced from 0.35 to 0.17, the standard deviation of the components is reduced from 0.273 to 0.128, the reduction amplitude reaches 53.1%, the solidification structure of the ingot is effectively refined, the distribution uniformity of the solute of the ingot is improved, and the yield of the ingot is improved.
The structure and function of the system will be described in detail below.
1. The pulse power supply is an RLC charging and discharging circuit, 220V alternating current is rectified through a voltage regulator, a transformer, a diode and the like, and then charging and discharging processes are carried out through a charging switch and a capacitor. Parameters such as output power, pulse width and the like can be adjusted by adjusting the parallel number of the capacitors.
2. The circular truncated cone type coil is connected with the pulse power supply through a lead, pulse current generated by the pulse power supply is induced and excited to generate pulse magnetic oscillation, and because the pulse current can generate heat when the pulse magnetic oscillation is excited through the circular truncated cone type coil, the heat can influence the normal work of the coil and even damage the coil, and therefore a cooling medium is introduced into the coil copper pipe for cooling.
The present invention will be described in detail with reference to the following examples.
Example 1
And establishing a finite element model according to the actual mould size, and simulating the melt internal flow field by adopting commercial software COMSOL MULTIPHYSICS. The experimental procedure for the simulated reference was: the mass ratio of pure aluminum to pure silicon is 97: and 3, weighing. The weighed raw materials were loaded using a dry clay dry pan and then placed in two well fritting furnaces (equipment model QJR1200-33, No. 2013012301, power 8KW) for melting. After the temperature is kept for 60 minutes, the mixture is directly poured into a mold (304 stainless steel) which is dried, and the pouring time is 15 seconds. And after the pouring is finished, covering heat preservation cotton at the riser for heat preservation, and applying the conical riser pulse magnetic oscillation treatment.
The simulation result is shown in fig. 3, the circular truncated cone type riser pulse magnetic oscillation forms double circulation in the ingot, the maximum flow velocity is nearly 600mm/s, the maximum flow velocity is located at the center of the ingot, the direction is vertical downwards, the generation of the flow shape is helpful for transferring the solute enriched in the riser to the whole ingot, and the solute is homogenized at the riser.
Example 2
The mass of the raw materials required in the liquid state is reversely deduced by calculating the volume of the die, and the mass ratio of pure aluminum to pure silicon is 97: and 3, weighing. The weighed raw materials were loaded using a dry clay dry pan and then placed in two well fritting furnaces (equipment model QJR1200-33, No. 2013012301, power 8KW) for melting. The smelting heating process is shown in figure 3. After the temperature is kept for 60 minutes, the mixture is directly poured into a mold (304 stainless steel) which is dried, and the pouring time is 15 seconds. After pouring, the riser is covered with heat insulation cotton for heat insulation, the power supply is turned on before casting ingot with HPMO to ensure the solidification process, and the power supply is turned off to stop the process when the temperature is below the solidus. And (3) demolding and sampling when the temperature reaches the room temperature, and half-cutting the sample along the axial direction by using a metal cutting band saw (model: GZ-4230). And turning and milling one half of the longitudinal section, and then carrying out macroscopic corrosion, wherein the corrosive liquid is a mixed reagent of hydrochloric acid, nitric acid, hydrofluoric acid and water in a ratio of 12:6:1: 1. The other half of the sample was drilled and sampled with a drill diameter of 5mm and sampling intervals of 10 mm. Chipping is taken along the radial direction at the axis in the vertical direction and the connecting part of the riser and the ingot body, and the silicon content is detected by adopting an inductively coupled plasma atomic emission spectrometer (model: 7300 DV).
FIG. 4 shows the solidification structure of the ingot and the distribution of the solute in the axial direction under the pulsed magnetic oscillation treatment of the truncated cone-shaped riser. It can be seen that the ingot without the application of the frustum-shaped riser pulse magnetic oscillation grows coarse columnar crystals near the periphery of the mold wall, large-size isometric crystals are formed at the tail end of the growth of the columnar crystals, the position of the finally solidified riser is also coarse isometric crystals, and the central part of the ingot is relatively fine isometric crystals. FIG. 4 is a graph of the segregation index distribution of solutes in the comparative group, low power (15KtA) and high power (45KtA), respectively. Under the condition that the conical riser pulse magnetic oscillation is not applied, serious positive segregation is presented at the riser, the segregation index fluctuates between 0.80 and 1.16, and the range is 0.36. The segregation index distribution of 7 points is out of the range of 0.9-1.1, and the fluctuation of the solute in the axial direction of the ingot is large, as shown in FIG. 4. And under the condition of small-power treatment of the cast ingot by the circular truncated cone type riser pulse magneto oscillation, the solute fluctuation is obviously reduced, the ingot body segregation and the riser positive segregation are inhibited, and the solute distribution is uniform. The segregation index fluctuates between 0.89 and 1.08, the range of the segregation index is reduced to 0.19, and the reduction amplitude reaches 47.2 percent, as shown in FIG. 4. Under the condition of high-power treatment of the conical riser pulse magnetic oscillation, the fluctuation of the solute of the ingot body is also reduced, the segregation index fluctuates between 0.90 and 1.14, the range is 0.24, and the reduction amplitude is 33.3 percent. Consistent with the low power condition, the segregation indexes of the ingot body part are all in the range of 0.9-1.1, as shown in figure 4. The segregation indexes of the ingots subjected to the conical riser pulse magnetic oscillation almost all fluctuate within the range of 0.9-1.1, and it can be seen that the segregation degrees of the ingots treated by the two power treatments are lighter than those of the ingots treated by the comparison. The standard deviation of the solute of the comparison ingot, the small-power processing ingot and the high-power processing ingot is 0.27, 0.13 and 0.17 respectively, the fluctuation of the components in the axial direction of the small-power ingot casting is the smallest and the distribution is the most uniform in the pulse magneto oscillation of the truncated cone-shaped riser, and the fluctuation of the components in the axial direction of the comparison ingot is the largest in the second time of the high-power processing ingot. After 4 points at the top of the cap were removed, the standard deviation was changed to 0.26, 0.10, and 0.14, respectively, and the fluctuation of the composition distribution was significantly improved.
The numerical simulation result shows that the intermittent electromagnetic force generates the maximum flow velocity in the axial direction of the ingot casting melt, on one hand, the solute can fully flow in the axial position of the ingot casting, and the solute can be distributed macroscopically, so that the uniformity of the solute is improved; on the other hand, the formation of the circulation flow can greatly reduce the severity of positive segregation caused by the enrichment of elements at the dead head position due to the selective crystallization, and the flow field can smoothly bring the solute enriched at the dead head position into the bottom of the ingot, thereby reducing the macro segregation.
Claims (4)
1. A truncated cone-shaped riser pulse magnetic oscillation processing device is characterized by comprising a pulse power supply (1), a conductor (2), a refractory material (3), an ingot (4), a truncated cone-shaped coil (5), a coil forming fixing support (6) and a casting mold (7), wherein the coil forming fixing support (6) is made of a high-temperature-resistant mullite material with the Mohs hardness of more than 6, the truncated cone-shaped coil (5) is wound on the coil forming fixing support (6) and then embedded into the refractory material (3), the whole truncated cone-shaped coil dead head is placed on a casting mold (7), a pulse power supply (1) is connected with the truncated cone-shaped coil (5) through a conductor (2), high-temperature metal melt is solidified into an ingot (4) in the casting mold (7) and the truncated cone-shaped coil (5), and pulse current generated by the pulse power supply (1) enters the truncated cone-shaped coil (5) through the conductor (2) to excite a pulse magnetic field to act on the ingot (4).
2. The circular truncated cone-shaped riser pulse magnetic oscillation processing device according to claim 1, wherein an included angle between an intrados of the coil forming fixing support (6) and a horizontal plane is alpha, the included angle alpha is not more than 70 degrees, and the intrados is circular in shape.
3. The device for pulsed-magnetic-oscillation processing of the truncated cone-shaped risers as claimed in claim 1, wherein the current waveform input to the truncated cone-shaped coil by the pulse power supply (1) is pulse alternating current, pulse square wave, pulse triangular wave, and the output mode is single pulse or double pulse.
4. The device for pulse magnetic oscillation processing of the truncated cone-shaped riser according to claim 1, wherein the truncated cone-shaped coil (5) is formed by winding a copper pipe, the copper pipe is hermetically wound with a polyimide film before winding, and if the truncated cone-shaped coil is wound with the copper pipe, a cooling liquid can be filled in the copper pipe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114749616A (en) * | 2022-03-10 | 2022-07-15 | 上海大学 | Ingot mould for large-scale high-length-diameter ratio steel ingot and blank forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114749616A (en) * | 2022-03-10 | 2022-07-15 | 上海大学 | Ingot mould for large-scale high-length-diameter ratio steel ingot and blank forming method |
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