CN201711521U - Strong pulse current directional solidifying device - Google Patents
Strong pulse current directional solidifying device Download PDFInfo
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- CN201711521U CN201711521U CN2010202367101U CN201020236710U CN201711521U CN 201711521 U CN201711521 U CN 201711521U CN 2010202367101 U CN2010202367101 U CN 2010202367101U CN 201020236710 U CN201020236710 U CN 201020236710U CN 201711521 U CN201711521 U CN 201711521U
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Abstract
The utility model discloses a strong pulse current directional solidifying device, which comprises a heating controller, a withdrawing transmission mechanism, a supporting body, a directional crystallizing furnace, a cantilever platform, a fixing bracket and a pulse power source, wherein the heating controller is connected with a thermocouple and the directional crystallizing furnace through conducting wires, and the thermocouple is inserted into the inner wall of the directional crystallizing furnace; and the temperature value in the directional crystallizing furnace is measured and transmitted in real time, thereby adjusting the connected/disconnected state for heating the inner ring fused corundum pipe of the directional crystallizing furnace in real time, and controlling the temperature in the directional crystallizing furnace. The pulse power source is connected with cold/hot end electrode through conducting wires, and the control on the pulse current is completed according to the electrical pulse parameter regulating command; moreover, cylindrical solidification structures with fine crystalline grain sizes and identical orientations are achieved under the premise of simple equipment, the effect is remarkable, and the harm of the electromagnetic radiation can be reduced, so as to alleviate the burden on the environment.
Description
Technical field
The utility model relates to a kind of coagulation system, specifically, relates to a kind of flash current oriention coagulation system.
Background technology
Existing device for directionally solidifying all adopts Bridgman method, and thermograde and grain growth speed by in the control directional solidification process obtain solidified structure grain orientation preferably.Come the thinning microstructure structure by the thermograde and the growth rate that improve solid liquid interface in the process of setting as far as possible simultaneously, it is tiny to obtain radial dimension with this, the solidified structure of the direction of grain growth simultaneously unanimity.But its device structure complexity, and relatively be difficult to realize.
By pulse generating unit, utilize electric field force to cause the relative motion of liquid phase and solid phase, promote dendrite fragmentation that crystal grain is increased and come crystal grain thinning that this process can be good at realizing pollution-free crystal grain thinning owing to do not contact with metal material.Related data shows that the thin crystal technique of various electric fields, the thin crystal technique in magnetic field all can reach the purpose of thinning solidification structure crystal grain preferably.And existing pulse current grain refinement device just to motlten metal natural coagulation handle, in crystal grain thinning, can't obtain the tissue of grain orientation unanimity.
In Chinese patent 200710177552.X, disclose metal material high-temperature processing method and device under a kind of resultant field, and metal material high-temperature processing method and device under this resultant field have been made detailed description.It applies coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to metal bath, control crystallite dimension and crystal orientation.Utilize superconducting intense magnetic field to suppress that stocks gravitational settling and free convection come guiding material to solidify along certain crystal orientation in the melt, utilize pulsed magnetic field to suppress Marangoni convection action in the melt, crystal grain thinning.This method is owing to need control grain orientation by superconducting intense magnetic field, and its device design is complicated, and production cost is also higher, and the superconducting intense magnetic field electromagnetic radiation is also bigger, can cause certain pollution to working environment.
The utility model content
The technical problems to be solved in the utility model provides a kind ofly can control grain orientation in the directional solidification process, simultaneously flash current oriention coagulation system that again can refining grain size.
For solving the problems of the technologies described above, the utility model flash current oriention coagulation system is to be made of pulse current generating device and device for directionally solidifying two parts, pulse current generating device provides current impulse to motlten metal, constantly impacts the grain structure in the growth, causes crystal grain tiny; Device for directionally solidifying produces the thermograde in the metal solidification process, obtains the solidified structure of grain growth direction unanimity.
Described pulse current generating device, belong to the capacitance energy storage high power pulsed source of compression energy in time, adopt the mode of discharge loop short circuit, by control system control charge and discharge switch, make storage power finish release in the short time, obtain high pulse current peak at the utmost point.
Described device for directionally solidifying, be made up of heating controller, pull transmission mechanism, cantilever platform, fixed support, water cooling plant and directional crystallization furnace: heating controller is measured and the feedback furnace body temperature in real time by thermocouple, realizes the automatic adjusting to furnace body temperature; The speed that moves both vertically of pull transmission mechanism control directional crystallization furnace; The cantilever platform connects pull transmission mechanism and fixed orientation crystal growing furnace.
Fixed support in the described device for directionally solidifying is positioned at crystallographic orientation furnace shell below, is fixed on the level table, is independent of other device.Its upper end is provided with sample clamping mechanism, is used for fixing the cold junction electrode that holds corundum crucible.During use, the corundum crucible that holds the metal solution is nested on the cold junction electrode, and the shake of pull transmission mechanism is to the influence of its metal solution directional solidification grain structure orientation when having got rid of pull metal bar material in the past fully.
Water-cooling structure in the described device for directionally solidifying is made up of water collar, mistake tank piece and water inlet pipe, outlet pipe, is positioned at the bottom of directional crystallization furnace, and the centre is filled with heat-barrier material, to prevent that heat is to cooling jacket and body of heater conduction; Water-cooling structure is taken away unnecessary heat around the sample in order to the end of cooling corundum crucible, and bigger thermograde is provided.During use, by regulating the temperature and the flowing velocity of cooling water, and with the furnace body temperature of directional crystallization furnace, realize the big temperature difference of liquid metal alloy liquid-solid boundary, to satisfy the requirement of the temperature required gradient of experiment.
In order to solve in the metal solidification process, to apply strong current pulse to motlten metal simultaneously and realize that thin brilliant and big thermograde realizes directional solidification.Keep device for directionally solidifying constant during use, pulse current generating device just (is being born) utmost point by on the cold junction electrode of threaded terminal access in order to nested corundum crucible, negative (just) utmost point directly feeds in the motlten metal in the corundum crucible by a high temperature resistant electrode and realizes that short circuit connects, according to the electric pulse parameter regulating command, realize the control of paired pulses electric current in the directional solidification process.
The utility model flash current oriention coagulation system is the combination of directional solidification technique and the rotten pulse processing of electricity.In the directional solidification process, apply pulse current simultaneously, and commutative cold junction electrode and the hot junction electrode of being connected in the positive and negative two ends of the pulse power, all can reach thin brilliant purpose.The apparatus simple and flexible, save production cost, efficient improves greatly, make material in a heating process, can finish crystallite dimension and grain-oriented control simultaneously, reduce component segregation with fine little loose, help improving the serviceability of metal alloy, obtain the metal material that property requires.Can also reduce the injury of electromagnetic radiation, alleviate the burden of environment.Cold junction electrode holder of the present utility model is held on the fixed support, and the shake of pull transmission mechanism is to the influence of metal bath directional solidification grain structure orientation when having got rid of pull metal bar material in the past fully.
Description of drawings
Below in conjunction with accompanying drawing the utility model flash current oriention coagulation system is described in further detail.
Fig. 1 is the schematic diagram of the utility model flash current oriention coagulation system structure.
Fig. 2 be in the utility model flash current oriention coagulation system the pull transmission mechanism along the cutaway view of A-A line.
Fig. 3 be in the utility model flash current oriention coagulation system cantilever platform structure along the cutaway view of B-B line.
Fig. 4 is the schematic diagram of crystallographic orientation furnace structure in the utility model flash current oriention coagulation system.
Fig. 5 is the cutaway view of furnace body support and water collar structure in the utility model flash current oriention coagulation system.
Fig. 6 is a supporter vertical view in the utility model flash current oriention coagulation system.
Among the figure: 1. heating controller 2. direct current generators 3. pull transmission mechanisms 4. supporters 5. leading screws 6. water collars 7. directional crystallization furnaces 8. screw rods 9. long bolts 10. cantilever platforms 11. fixed supports 12. pulse powers 13. straight spur gears 14. worm and gears 15. cold junction electrodes 16. heat-barrier materials 17. insulation materials 18. outer heating wire 19. thermocouples 20. screwed pipes 21. hot junction electrodes 22. interior electric heating 23. refractory wass coatings 24. furnace body supports 25. water inlet pipes
The specific embodiment
As Fig. 1, be the structure of flash current oriention coagulation system, it is made of pulse current generating device and device for directionally solidifying.Described pulse current generating device is to provide current impulse to motlten metal, constantly impacts the grain structure in the growth, causes crystal grain tiny; Described device for directionally solidifying provides the thermograde in the metal solidification process, obtains the solidified structure of grain growth direction unanimity.Its structure mainly comprises pull transmission mechanism 3, supporter 4, cantilever platform 10, water collar 6, heat-barrier material 16, directional crystallization furnace 7 and fixed support 11, cold junction electrode 15, hot junction electrode 21, thermocouple 19, heating controller 1, the pulse power 12 parts composition.And keep hot junction electrode 21, directional crystallization furnace 7,15 threes are coaxial for the cold junction electrode.
Fig. 2 has showed that the pull transmission mechanism is along the cutaway view of A-A line in the utility model flash current oriention coagulation system, and it adopts the deceleration principle of pull transmission mechanism.Wherein, pull transmission mechanism 3 reduces the rotating speed of direct current generator 2 by straight spur gear 13 and worm and gear 14 double reduction transmissions, by leading screw 5 transmissions the rotation of worm gear is changed into the rectilinear motion of supporter 4 vertical direction again, thereby the directional crystallization furnace 7 that drives on the cantilever platform 10 moves up and down, the speed that moves both vertically of control directional crystallization furnace 7.
Fig. 3 has provided in the utility model flash current oriention coagulation system cantilever platform structure along the cutaway view of B-B line.The lower end of described cantilever platform (10) uses alignment pin to be connected with the end of supporter (4), can be fixed on the optional position, cantilever platform 10 upper ends are connected with furnace body support 24 by four long bolts 9, directional crystallization furnace 7 and be connected and fixed with water collar 6 usefulness screw rods 8, supporter 4, cantilever platform 10, water collar 6, furnace body support 24 and directional crystallization furnace 7 are become one, realize directly controlling the speed that moves both vertically of directional crystallization furnace 7 by pull transmission mechanism 3.As shown in Figure 6, can wait the relative position of regulating between supporter 4, cantilever platform 10, water collar 6, furnace body support 24 and the directional crystallization furnace 7 to satisfy experimental requirements by the position of regulating alignment pin, the screwing length of long bolt 9 during use.
Be filled with heat-barrier material 16 between water collar 6 and the directional crystallization furnace 7, to avoid heat to the too much radiation of cooling jacket or to the support conduction, heat-barrier material is the cotton felt of high-alumina refractory fiber, can be 1000 ℃-1250 ℃ long-term down uses.As shown in Figure 5,, be provided with water collar 6 at bottom of furnace body for improving the axial-temperature gradient of electric pulse directional crystallization furnace 7, select for use heat conductivility preferably copper material as its main material.By regulating the temperature and the flowing velocity of cooling water in the water inlet pipe 25, and with the furnace body temperature of directional crystallization furnace 7, realize the big temperature difference of liquid metal alloy liquid-solid boundary, to satisfy the requirement of the temperature required gradient of experiment.During use, when workpiece is released burner hearth gradually under the effect of pull system, under the chilling action of water collar 6 and very fast cooling makes the solid-liquid plane of metal boost along the boiler tube axis.
Fig. 4 is the schematic diagram of crystallographic orientation furnace structure in the utility model flash current oriention coagulation system.Described directional crystallization furnace 7 is a well formula hollow stove, is to utilize electric current to heat stove and accessory by the heat that resistive element produces.It adopts outer ring steady heating, and the mode of inner ring compensation heating guarantees the uniformity of fire box temperature field distribution, and the outer ring is a not courage of horse, and the inner ring burner hearth is made of the thermostable high-alumina earthenware.Body of heater is made of interior heating wire 22, outer heating wire 18, insulation material 17 and furnace wall.Select for use 0Cr25Al15 as heating material, in air, be heated to the FeCrAl resistance wire about 500 ℃ and be incubated 4～5h, make material surface form protective layer of alumina gradually, to improve the service life of heating.Interior heating wire 22 is surrounded on the screwed pipe 20, and screwed pipe 20 materials are the electro-corundum pipe.Be shaped on thread groove on the furnace tube outer wall in advance, outer heating wire 18 coileds are put in the outer ring, play the reinforcement heat-insulating property, stablize the effect of furnace temperature.After winding heating wire, divide at furnace tube outer wall that to smear thickness for several times be refractory wass coating 23 about 5mm, and dry solidification, break away from thread groove to avoid heating wire temperature distortion at high temperature, cause adjacent heating wire contact and short circuit, can make heating wire and air insulated in addition, effectively alleviate the heating wire oxidation, improve service life.Corundum screwed pipe, horse are not fully tamped with aluminosilicate refractory fiber between courage and the furnace wall, guarantee the heat-insulating property that its directional crystallization furnace 7 is good.
Fixed support 11 places on the level table of cantilever shalving below, is independent of the pull transmission mechanism, and cantilever platform 10 positions maintain a certain distance during with the pull original state; Cold junction electrode 15 is fixed on the fixed support upper end, material is 45 steel, its lower end turning goes out internal thread, hot junction electrode 21 is fixed on the cantilever shalving, in experimentation, corundum crucible is nested on the cold junction electrode 15, the pulse power just (bear) utmost point be connected with the isometrical male connection of cold junction electrode lower end internal thread on, screw in the access that screw thread can be finished the cold junction electrode; Negative (just) utmost point of the pulse power directly inserts the hot junction electrode by high temperature electrode.
The pulse power 12 belongs to the capacitance energy storage high power pulsed source of compression energy in time, adopt the mode of discharge loop short circuit, make storage power in 500ns, finish release, can obtain high pulse current peak, improve the thermograde at solid liquid interface place, improve nucleation rate, thereby reach the purpose of crystal grain thinning.Electric pulse parameter is: pulse power electric capacity 0-120 μ F, and crest value of impulse voltage is 3000V, pulsed operation frequency 0.25-2.5Hz, pulse peak current can reach the 0.1MA level.During use, the make pulse power supply, cold junction electrode 15 constitutes the closed-loop path with hot junction electrode 21 by the motlten metal in the corundum crucible, and keep motionless with fixed support 11, directional crystallization furnace 7, heat-barrier material 16, water collar 6 are positioned on the pull control system cantilever platform 10 as a whole, by the speed that moves both vertically of pull transmission mechanism 3 control directional crystallization furnaces, realize that motlten metal moves with respect to the orientation of directional crystallization furnace 7.According to the electric pulse parameter regulating command, the metal solution is applied current impulse simultaneously, finish the directional solidification and the grain refinement of test button.The utility model is controlled thin brilliant effect and the effect of control grain orientation simultaneously in conjunction with directional solidification technique and the rotten pulse processing of electricity in a process of setting of metal bath.Apparatus structure is simple, saves production cost, and raises the efficiency; Can also reduce the injury of electromagnetic radiation, alleviate the burden of environment.
Claims (7)
1. flash current oriention coagulation system, comprise heating controller (1), direct current generator (2), pull transmission mechanism (3), supporter (4), water collar (6), directional crystallization furnace (7), cantilever platform (10), the fixed support (11) and the pulse power (12), it is characterized in that: described heating controller (1) is connected with directional crystallization furnace (7) resistance wire with thermocouple (19) by lead, thermocouple (19) inserts the inwall of directional crystallization furnace (7), directional crystallization furnace (7) furnace body temperature that measures according to thermocouple (19), and feed back to heating controller (1) control directional crystallization furnace (7) internal temperature.
2. flash current oriention coagulation system according to claim 1, it is characterized in that: the lower end of described cantilever platform (10) uses alignment pin to be connected with the end of supporter (4), can be fixed on the optional position, cantilever platform (10) upper end is connected with furnace body support (24) by four long bolts (9), directional crystallization furnace (7) is connected and fixed with screw rod (8) with water collar (6), and supporter (4), cantilever platform (10), water collar (6), furnace body support (24) and directional crystallization furnace (7) are become one.
3. flash current oriention coagulation system according to claim 1, it is characterized in that: described fixed support (11) is positioned at directional crystallization furnace (7) housing below, maintain a certain distance with cantilever platform (10) position, cold junction electrode (15) is fixed on fixed support (11) upper end by clamping device, hot junction electrode (21) is fixed on the cantilever shalving, corundum crucible is nested on the cold junction electrode (15), and keeps hot junction electrode (21), directional crystallization furnace (7), cold junction electrode (15) three coaxial.
4. flash current oriention coagulation system according to claim 1, it is characterized in that: described pull transmission mechanism (3) reduces the rotating speed of direct current generator (2) by straight spur gear (13) and worm and gear (14) double reduction transmission, by leading screw (5) transmission the rotation of worm gear is changed into the rectilinear motion of supporter (4) vertical direction again, the directional crystallization furnace (7) that drives on the cantilever platform (10) moves up and down, the speed that moves both vertically of control directional crystallization furnace (7), point-to-point speed is 10-1000 μ m/s.
5. flash current oriention coagulation system according to claim 1, it is characterized in that: described water collar (6) is arranged between the top of fixed support (11) and the directional crystallization furnace (7) and is filled with heat-barrier material (16), and heat-barrier material is the cotton felt of high-alumina refractory fiber; By the temperature of cooling water and the furnace body temperature of flowing velocity and directional crystallization furnace (7) in the adjusting water inlet pipe (25), realize the big temperature difference of liquid metal alloy liquid-solid interface.
6. flash current oriention coagulation system according to claim 1, it is characterized in that: described directional crystallization furnace (7), the outer ring is a not courage of horse, the inner ring burner hearth is the thermostable high-alumina earthenware, body of heater is by interior heating wire (22), outer heating wire (18), insulation material (17) and furnace wall constitute, interior heating wire (22) is surrounded on the screwed pipe (20), furnace tube outer wall is provided with thread groove, outer heating wire (18) coiled is put in the outer ring, after winding heating wire, at the furnace tube outer wall smearing thickness is the refractory wass coating (23) of 5mm, and dry solidification, the corundum screwed pipe, horse is not fully tamped with aluminosilicate refractory fiber between courage and the furnace wall, guarantees the heat-insulating property of directional crystallization furnace (7).
7. flash current oriention coagulation system according to claim 1, it is characterized in that: the described pulse power (12) provides the flash electric current to motlten metal, the positive and negative electrode of the pulse power (12) output connects with cold junction electrode (15) and hot junction electrode (21) respectively, constitutes closed discharge loop by the motlten metal in the corundum crucible; Cold junction electrode (15) lower end is provided with internal thread, the pulse power (12) just (bear) utmost point by the external screw thread terminal, screw by screw thread with cold junction electrode (15) and finish electrode and be connected.
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| CN2010202367101U CN201711521U (en) | 2010-06-24 | 2010-06-24 | Strong pulse current directional solidifying device |
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| CN2010202367101U CN201711521U (en) | 2010-06-24 | 2010-06-24 | Strong pulse current directional solidifying device |
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| CN201711521U true CN201711521U (en) | 2011-01-19 |
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| CN2010202367101U Expired - Fee Related CN201711521U (en) | 2010-06-24 | 2010-06-24 | Strong pulse current directional solidifying device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357650A (en) * | 2011-09-28 | 2012-02-22 | 中南大学 | Steel liquid solidification simulator in continuous casting crystallizer |
| CN111933308A (en) * | 2020-08-14 | 2020-11-13 | 西南交通大学 | High-temperature superconducting strip series-connection joint for magnetic confinement fusion magnet |
-
2010
- 2010-06-24 CN CN2010202367101U patent/CN201711521U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357650A (en) * | 2011-09-28 | 2012-02-22 | 中南大学 | Steel liquid solidification simulator in continuous casting crystallizer |
| CN102357650B (en) * | 2011-09-28 | 2013-04-17 | 中南大学 | Steel liquid solidification simulator in continuous casting crystallizer |
| CN111933308A (en) * | 2020-08-14 | 2020-11-13 | 西南交通大学 | High-temperature superconducting strip series-connection joint for magnetic confinement fusion magnet |
| CN111933308B (en) * | 2020-08-14 | 2022-09-09 | 西南交通大学 | High-temperature superconducting strip series-connection joint for magnetic confinement fusion magnet |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20130624 |