CN105057611A - Test device for simulating continuous casting billet solidification and method using same - Google Patents
Test device for simulating continuous casting billet solidification and method using same Download PDFInfo
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- CN105057611A CN105057611A CN201510459186.1A CN201510459186A CN105057611A CN 105057611 A CN105057611 A CN 105057611A CN 201510459186 A CN201510459186 A CN 201510459186A CN 105057611 A CN105057611 A CN 105057611A
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Abstract
The invention discloses a test device for simulating continuous casting billet solidification and a method using same. The test device comprises a foundation bed, wherein an induction heating furnace is arranged on the foundation bed; an opening is formed in the bottom of the induction heating furnace; a piston is arranged in the opening; a rack guide rod, a first lifting table and a second lifting table are arranged on the upper part and the lower part of the rack guide rod respectively; a first motor, a supporting table and a vibrating motor are arranged on the first lifting table; a second motor and a worm are arranged on the supporting table; a billet pushing refractory brick is arranged at the bottom end of the worm; the vibrating motor is connected with a crystallizer by a connecting rod; a cavity is arranged in the middle of the crystallizer; cooling water flows into the crystallizer and flows out of the crystallizer; a third motor and a screw are arranged on the second lifting table; one end of the screw is connected with the second lifting table; the other end of the screw is connected with a piston; and a water spray device is used for cooling formed casting billet. According to the test device and the test method disclosed by the invention, a continuous casting billet solidification process in practical production is stimulated to obtain the casting billet; and practical production is guided by carrying out research and analysis on the quality and the microstructure of the casting billet.
Description
Technical field
The present invention relates to continuous casting of iron and steel modelling technique application, particularly relate to and a kind ofly simulate the experimental rig and using method thereof that continuous casting billet solidifies.
Background technology
Along with scientific and technological progress, process conditions are improved, and China's output of steel leaps to rank first, but modern enterprise is more and more higher for metal material performance requirement, and high-performance steel manufacture level still needs to improve.Continuous casting, as the revolutionary technology of steel and iron industry, has become the indispensable technique of steel-making.The generation of defect in casting process, comprises that face crack, subcrack, oscillation mark, quality are uneven etc. all can be had a strong impact on steel product quality and reduce the performance of enterprises.
Continuous cast mold is the most important part of continuous casting process, is called " heart " of conticaster.Molten steel in tundish is injected in crystallizer by submersed nozzle, cools in crystallizer, forms the strand with certain shell thickness, strand with liquid core is constantly drawn out by the throwing straightener below crystallizer, colder through two, aligning, cutting, finally forms steel billet.Solidifying of molten steel in mold comprises heat transfer, mass transfer, phase transformation, multiphase flow etc., is a complicated dynamic process.The control of technological parameter on slab quality such as operating procedure, mold flux property, cooling water amount of crystallizer has very important impact.
Improve steel product quality, then need to improve process conditions, control the solidification process of metal in casting process, obtain the grain structure of refinement, but the technological factor of continuous casting high temperature complexity determines very difficult to the observational study of its solidified structure, for the research of continuous casting billet quality, mainly through cutting sample analysis to the strand gathered from steel mill, due to the continuity of actual production, in process prepared by sample, the adjustment of technological parameter is had some limitations, and trial-manufacturing process meeting at substantial manpower and materials, underproof steel institutional framework can cause great deal of steel to be scrapped, for improving steel product quality, reduce trial-production loss, analogue technique must be adopted.Along with the develop rapidly of nowadays computer technology, achieved and utilized computer simulation continuous casting billet tissue coagulation process, but the checking of analog result still needs from steel mill's sampling, process is loaded down with trivial details.
Therefore be necessary that setting up continuous casting billet solidification simulation testing equipment solidifies behavior to study continuous casting billet, test data will provide certain guidance to actual production and sets up for numerical simulator provides verification condition.
Summary of the invention
For prior art Problems existing, the invention provides one and can simulate continuous casting billet and solidify, thus obtain strand and carry out detecting and analyze with the experimental rig instructing the simulation continuous casting billet of actual production to solidify and using method thereof.
To achieve these goals, the present invention adopts following technical scheme:
Simulate the experimental rig that continuous casting billet solidifies, comprising:
Pedestal;
Induction heater is located on described pedestal, has molten steel in described induction heater, and the top of described molten steel has covering slag, and the bottom of described induction heater is provided with perforate, and piston is installed in described perforate;
At least side of described pedestal is located at by frame guide rod;
First lifting platform is installed in the top of described frame guide rod, described first lifting platform is provided with the first motor, brace table and vibrating motor, described first motor drives described first lifting platform to move up and down, described brace table is fixed on described first lifting platform, described brace table is provided with the second motor and is positioned at the worm screw of described second motor side, described in described second Electric Machine Control, worm screw moves up and down, the bottom of described worm screw is provided with and pushes away base refractory brick, described vibrating motor is connected to crystallizer by connecting rod, described vibrating motor controls described mold oscillation, cavity is provided with in the middle of described crystallizer, the described base refractory brick that pushes away can stretch in described cavity, and described cavity supplies the top of described piston to enter, the inner Cooling Water of described crystallizer enters, go out,
Second lifting platform is installed in the bottom of described frame guide rod, described second lifting platform is provided with the 3rd motor and screw rod, described 3rd motor drives described second lifting platform to move up and down, and described screw rod one end is connected to described second lifting platform, and the other end is connected to described piston;
Water injector is located on described frame guide rod, and is positioned at the below of described second lifting platform, cools the strand after shaping.
Further, the both sides of described pedestal are respectively equipped with described frame guide rod, and wherein described in one, the side of frame guide rod is provided with Position Scale.
Further, the bottom of described piston coordinates with described opening gaps, and the top of described piston coordinates with described cavity clearance.
Further, be provided with sealing ring between described piston and described eddy-current heating furnace bottom to seal.
Further, the both sides of described crystallizer are respectively equipped with water inlet pipe and outlet pipe, and Cooling Water passes in and out, and is provided with water intaking valve, is provided with outlet valve between described outlet pipe and described crystallizer between described water inlet pipe and described crystallizer.
Further, described crystallizer top is provided with oiling device, and high temperature resistant luboil is distributed in described cavity by described oiling device.
Further, the rising or falling speed scope of described first lifting of lifting table, described second lifting platform and described worm screw is 0.5-4.5m/min, and the frequency range of described vibrating motor is 30-400 times/min, and amplitude range is 2-20mm.
Adopt a using method for above-mentioned experimental rig, comprising:
Step one: start the second lifting platform described in the 3rd Electric Machine Control and rise, described screw rod is along with described second lifting platform rising, and driving described piston to rise, the top of described piston enters described eddy-current heating furnace interior, and the bottom of described piston is installed in described perforate;
Step 2: add required steel sample in described induction heater, start described induction heater, after the whole melting of steel sample is molten steel, adds covering slag on molten steel top and makes it fusing;
Step 3: start the first lifting platform described in described first Electric Machine Control and decline, described crystallizer is inserted in molten steel, when certain altitude in described cavity is stretched on the top that described crystallizer drops to described piston, closes described first motor;
Step 4: set described vibrating motor parameter, open described vibrating motor, closes described vibrating motor after described mold oscillation certain hour;
Step 5: start described second motor and drive described worm screw to move down, when described push away base refractory brick touch described covering slag end face time, start described 3rd motor, and the decrease speed arranging described 3rd motor is identical with the decrease speed of described second motor;
Step 6: open described water injector, strand is cooled, take out strand after cooling;
Step 7: detection is carried out to the casting billet surface taken out and internal soundness and analyzes.
Further, before step 3, in described crystallizer, pass into cooling water.
Further, after step 6, start described 3rd motor and drive described second lifting platform to get back to position in step one, then start described first motor and drive described crystallizer to rise until leave described induction heater, complete battery of tests.
Beneficial effect of the present invention:
(1) the present invention simulates the experimental rig that continuous casting billet solidifies, be consistent with practical condition, different technical parameters can be studied by test data, comprise the impact on casting blank solidification behavior and institutional framework thereof such as covering slag thickness, mold oscillation frequency, Oscillation Amplitude, cooling water injection flow rate, by these parameter directs actual production activities;
(2) the present invention can be combined with Micro Numerical Simulation, analysis is gone to improve continuous casting billet quality from experiment and numerical simulation double angle, the result of test data and computer simulation system can be compared, the error of Adjustable calculation machine simulation system, make the result of computer simulation system more accurate, make, in its simulation process for multiple strand, to save cost, save test and sample the manpower and materials expended.
Accompanying drawing explanation
Fig. 1 is the structural representation of experimental rig original state of the present invention;
Fig. 2 is the structural representation that experimental rig crystallizer of the present invention inserts in molten steel;
Fig. 3 is the structural representation that experimental rig of the present invention pushes away when base refractory brick stretches into conflict covering slag in cavity;
In figure, 1, crystallizer; 2, induction heater; 3, base refractory brick is pushed away; 4, the first motor; 5, the second motor; 6, the 3rd motor; 7, vibrating motor; 8, the first lifting platform; 9, the second lifting platform; 10, covering slag; 11, molten steel; 12, water intaking valve; 13, outlet valve; 14, frame guide rod; 15, piston; 16, water injector; 17, worm screw; 18, pedestal; 19, connecting rod; 20, brace table; 21, water inlet pipe; 22, outlet pipe; 23, sealing ring; 24, screw rod; 25, Position Scale; 26, water injection valve; 27, oiling device; 28, perforate; 29, cavity.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the present invention simulates the experimental rig that continuous casting billet solidifies and comprises pedestal 18, pedestal 18 is provided with induction heater 2, the at least side of pedestal 18 is provided with frame guide rod 14, in the present embodiment, the both sides of pedestal 18 are respectively equipped with frame guide rod 14, and wherein the side of a frame guide rod 14 is provided with Position Scale 25.Frame guide rod 14 top is equiped with the first lifting platform 8, and the below that bottom is equiped with the second lifting platform 9, second lifting platform 9 is equiped with water injector 16.
Induction heater 2 is built with molten steel 11; the top of molten steel 11 has covering slag 10; the bottom of induction heater 2 is provided with perforate 28, perforate 28 built with piston 15, the bottom of piston 15 and perforate 28 matched in clearance; fit tolerance is 1-2mm; the top of piston 15 is stretched in induction heater 2, and preferably, this piston 15 is made for refractory material; be provided with sealing ring 23 between bottom piston 15 and induction heater 2 to seal, prevent molten steel 11 from oozing out.
The top of frame guide rod 14 is located at by first lifting platform 8, which is provided with the first motor 4, brace table 20 and vibrating motor 7, first motor 4 can drive the first lifting platform 8 to be elevated, brace table 20 is fixed on the first lifting platform 8, brace table 20 upwards extends, which is provided with the second motor 5 and be positioned at the worm screw 17 of the second motor 5 side, second motor 5 can control worm screw 17 and move up and down, the bottom of worm screw 17 is provided with and pushes away base refractory brick 3, vibrating motor 7 is connected to crystallizer 1 by connecting rod 19, vibrating motor 7 can control crystallizer 1 and vibrate, crystallizer 1 is vibrated with specific vibration frequency.Cavity 29 is provided with in the middle of crystallizer 1, pushing away base refractory brick 3 can stretch in cavity 29, when crystallizer 1 enters after in induction heater 2, cavity 29 can enter for the top of piston 15, the top of piston 15 and cavity 29 matched in clearance, fit tolerance is 1-2mm, according to casting blank shape size, can select piston 15 top corresponding with crystallizer 1 cavity 19 geomery.The both sides of crystallizer 1 are respectively equipped with water inlet pipe 21 and outlet pipe 22, Cooling Water passes in and out, and to cool strand, is provided with water intaking valve 12 between water inlet pipe 21 and crystallizer 1, outlet valve 13 is provided with between outlet pipe 22 and crystallizer 1, can controlled cooling model discharge by water intaking valve 12 and outlet valve 13.Crystallizer 1 top is provided with oiling device 27, and high temperature resistant luboil is distributed in cavity 29 by oiling device 27, prevents molten steel 11 from boning with the cavity 29 of crystallizer 1 inside.
Second lifting platform 9 is installed in the bottom of frame guide rod 14, second lifting platform 9 is provided with the 3rd motor 6 and screw rod 24,3rd motor 6 can drive the second lifting platform 9 to move up and down, screw rod 24 one end is connected to the second lifting platform 9, the other end is connected to piston 15, when the 3rd motor 6 drives the second lifting platform 9 to move down, the second lifting platform 9 can drive screw rod 24 and piston 15 to move down, thus piston 15 is extracted the perforate 28 of induction heater 2.
Water injector 16 is located on frame guide rod 14, and be positioned at the below of the second lifting platform 9, after strand is shaping in induction heater 2, when deviating from downwards, regulate water injection valve 26 that water injector 16 is cooled the strand after shaping, the type of cooling in simulation actual production process, can obtain the strand identical with actual production.
In the present embodiment, the rising or falling speed scope of the first lifting platform 8 is 0.5-4.5m/min, the rising or falling speed scope of the second lifting platform 9 is 0.5-4.5m/min, the rising or falling speed scope of worm screw 17 is 0.5-4.5m/min, the frequency range of vibrating motor 7 is 30-400 times/min, and amplitude range is 2-20mm.
As Fig. 1 to Fig. 3, the present invention adopts the operation using method of above-mentioned experimental rig as follows:
Step one: startup the 3rd motor 6 controls the second lifting platform 9 and rises, screw rod 24 rises along with the second lifting platform 9, and drive piston 15 to rise, the top of piston 15 enters induction heater 2 inside, the bottom of piston 15 is installed in perforate 28, and with perforate 28 matched in clearance, then sealing ring 23 is loaded between piston 15 and induction heater 2;
Step 2: add required steel sample in induction heater 2, start induction heater 2, after the whole melting of steel sample is molten steel 11, add covering slag 10 on molten steel 11 top and make it fusing, then water intaking valve 12 and outlet valve 13 is opened, cooling water is injected in crystallizer 1, and opens oiling device 27, make oil film be covered with in the cavity 29 of crystallizer 1 inside;
Step 3: start the first motor 4 and control the first lifting platform 8 and decline, now crystallizer 1 moves down along with the first lifting platform 8, and insert in molten steel 11, observe Position Scale 25, when certain altitude in cavity 29 is stretched on the top that crystallizer 1 drops to piston 15, close the first motor 4, this highly can be 50mm;
Step 4: the parameter setting vibrating motor 7, if amplitude is 4mm, vibration frequency is 100 times/min, open vibrating motor 7, crystallizer 1 is according to the vibration parameters vibration preset, and close vibrating motor 7 after device 1 to be crystallized vibrates certain hour, this process is the forming process of strand;
Step 5: start the second motor 5 and drive worm screw 17 to move down, observe Position Scale 25, when pushing away base refractory brick 3 and touching covering slag 10 end face, start the 3rd motor 6, and the decrease speed arranging the 3rd motor 6 is identical with the decrease speed of the second motor 5, now push away base refractory brick 3 and promote strand downwards, the piston 15 of bottom leaves induction heater 2 simultaneously, discharges the upwards pushing tow to strand;
Step 6: open water injection valve 26, water injector 16 pairs of strands are cooled, strand is taken out after cooling, then starting the 3rd motor 6 drives the second lifting platform 9 to get back to position in step one, then starting the first motor 4 drives crystallizer 1 to rise until leave induction heater 2, completes battery of tests;
Step 7: detection is carried out to the casting billet surface taken out and internal soundness and analyzes; actual production is instructed by analysis result; if there is slab quality defect, then by regulating vibration frequency, the amplitude of crystallizer, or the kind of covering slag; thickness; or the cooling water inflow of crystallizer, also or the parameter such as the injection flow rate of water injector, carries out test of many times; obtain the strand of good quality, thus by these parameter directs actual production activities.Simultaneously, this experimental rig simulation continuous casting billet solidification processing can be combined with Micro Numerical Simulation, analysis is gone to improve continuous casting billet quality from experiment and numerical simulation double angle, the result of test data and computer simulation system can be compared, the error of Adjustable calculation machine simulation system, the result making computer simulation system is more accurate, makes in its simulation process for multiple strand, save cost, save test and sample the manpower and materials expended.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those skilled in the art are to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in right of the present invention.
Claims (10)
1. simulate the experimental rig that continuous casting billet solidifies, it is characterized in that, comprising:
Pedestal;
Induction heater is located on described pedestal, has molten steel in described induction heater, and the top of described molten steel has covering slag, and the bottom of described induction heater is provided with perforate, and piston is installed in described perforate;
At least side of described pedestal is located at by frame guide rod;
First lifting platform is installed in the top of described frame guide rod, described first lifting platform is provided with the first motor, brace table and vibrating motor, described first motor drives described first lifting platform to move up and down, described brace table is fixed on described first lifting platform, described brace table is provided with the second motor and is positioned at the worm screw of described second motor side, described in described second Electric Machine Control, worm screw moves up and down, the bottom of described worm screw is provided with and pushes away base refractory brick, described vibrating motor is connected to crystallizer by connecting rod, described vibrating motor controls described mold oscillation, cavity is provided with in the middle of described crystallizer, the described base refractory brick that pushes away can stretch in described cavity, and described cavity supplies the top of described piston to enter, the inner Cooling Water of described crystallizer enters, go out,
Second lifting platform is installed in the bottom of described frame guide rod, described second lifting platform is provided with the 3rd motor and screw rod, described 3rd motor drives described second lifting platform to move up and down, and described screw rod one end is connected to described second lifting platform, and the other end is connected to described piston;
Water injector is located on described frame guide rod, and is positioned at the below of described second lifting platform, cools the strand after shaping.
2. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, is characterized in that: the both sides of described pedestal are respectively equipped with described frame guide rod, and wherein described in one, the side of frame guide rod is provided with Position Scale.
3. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, it is characterized in that: the bottom of described piston coordinates with described opening gaps, the top of described piston coordinates with described cavity clearance.
4. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, is characterized in that: be provided with sealing ring between described piston and described eddy-current heating furnace bottom and seal.
5. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, it is characterized in that: the both sides of described crystallizer are respectively equipped with water inlet pipe and outlet pipe, Cooling Water passes in and out, be provided with water intaking valve between described water inlet pipe and described crystallizer, between described outlet pipe and described crystallizer, be provided with outlet valve.
6. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, is characterized in that: described crystallizer top is provided with oiling device, and high temperature resistant luboil is distributed in described cavity by described oiling device.
7. the experimental rig that solidifies of simulation continuous casting billet according to claim 1, it is characterized in that: the rising or falling speed scope of described first lifting of lifting table, described second lifting platform and described worm screw is 0.5-4.5m/min, the frequency range of described vibrating motor is 30-400 times/min, and amplitude range is 2-20mm.
8. adopt a using method for experimental rig described in claim 1, it is characterized in that, comprising:
Step one: start the second lifting platform described in the 3rd Electric Machine Control and rise, described screw rod is along with described second lifting platform rising, and driving described piston to rise, the top of described piston enters described eddy-current heating furnace interior, and the bottom of described piston is installed in described perforate;
Step 2: add required steel sample in described induction heater, start described induction heater, after the whole melting of steel sample is firm liquid, adds covering slag on molten steel top and makes it fusing;
Step 3: start the first lifting platform described in described first Electric Machine Control and decline, make described crystallizer insert in firm liquid, when certain altitude in described cavity is stretched on the top that described crystallizer drops to described piston, close described first motor;
Step 4: set described vibrating motor parameter, open described vibrating motor, closes described vibrating motor after described mold oscillation certain hour;
Step 5: start described second motor and drive described worm screw to move down, when described push away base refractory brick touch described covering slag end face time, start described 3rd motor, and the decrease speed arranging described 3rd motor is identical with the decrease speed of described second motor;
Step 6: open described water injector, strand is cooled, take out strand after cooling;
Step 7: detection is carried out to the casting billet surface taken out and internal soundness and analyzes.
9. using method according to claim 8, is characterized in that: before step 3, in described crystallizer, pass into cooling water.
10. using method according to claim 8, it is characterized in that: after step 6, starting described 3rd motor drives described second lifting platform to get back to position in step one, then starting described first motor drives described crystallizer to rise until leave described induction heater, completes battery of tests.
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| CN107067941A (en) * | 2017-04-12 | 2017-08-18 | 东北大学 | A kind of reactive continuous casting covering slag laminar flow Behavior modeling method |
| CN107876718A (en) * | 2017-11-20 | 2018-04-06 | 辽宁科技大学 | For simulating the experimental provision and experimental method of special heavy plate slow-set |
| CN109164130A (en) * | 2018-08-31 | 2019-01-08 | 马鞍山尚元冶金科技有限公司 | A kind of process of setting Cold simulating test method |
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| CN111531142B (en) * | 2020-06-18 | 2021-05-07 | 中南大学 | Device and method for simulating double-roller thin-strip continuous casting technological process |
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