CN105033213A - Simulating device for casting blanks in continuous casting chamfering crystallizer and application of simulating device - Google Patents
Simulating device for casting blanks in continuous casting chamfering crystallizer and application of simulating device Download PDFInfo
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- CN105033213A CN105033213A CN201510433842.0A CN201510433842A CN105033213A CN 105033213 A CN105033213 A CN 105033213A CN 201510433842 A CN201510433842 A CN 201510433842A CN 105033213 A CN105033213 A CN 105033213A
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Abstract
The invention relates to a simulating device for casting blanks in a continuous casting chamfering crystallizer and application of the simulating device, in particular to a simulating device for corner heat transfer and corner crack formation of initially-solidified blank shells in a continuous casting chamfering crystallizer in production and application of the simulating device. According to the simulating device, a copper plate surface making contact with molten steel comprises a chamfer and two copper plate surface bodies making contact with the chamfer. Two rows of thermocouples are arranged on each copper plate surface body, two rows of thermocouples are arranged on the chamfer, and the thermocouples are used for monitoring the changes of the temperature near a meniscus and the temperature field of a copper mold in the blank drawing process. By means of the method, generation of surface cracks of the initially-solidified blank shells under different stress conditions can be accurately controlled, stress data of the initially-solidified blank shells can be measured in real time, and data accuracy is high.
Description
Technical field
The present invention relates to the application of a kind of continuous casting chamfer crystallizer strand analogue means and this device; The application of analogue means and this device is formed in particular to the heat transfer of initial solidification base shell bight and corner crack in continuous casting chamfer crystallizer in a kind of steel manufacture process.
Background technology
Continuous casting of iron and steel slab transverse corner crack line is the mass defect had the greatest impact during iron and steel is produced, micro alloyed steel and low-alloy steel are especially serious, usual needs flame corner cut of carrying out rolling off the production line could be removed, otherwise will scrap when causing produced yield of steel plate low, serious or product degradation, both production technology direct motion had been affected, cause again recovery rate of iron decline to waste in a large number with the energy, finally affect the economic benefit of enterprise.
For a long time, steel slab surface transverse corner crack line annoyings each big steel enterprise all the time, although scientific research personnel has made great effort, the precautionary measures proposed also because of the actual conditions poor effect of each enterprise, have never fundamentally stopped the appearance of transverse corner crack line.Nearest researcher proposes chamfer crystallizer new technology, think slab that chamfer crystallizer the produces right angle part without conventional plate blank, and the new bight number of degrees formed are greater than 110 °, under normal pouring condition, slab bight temperature can improve more than 60 DEG C than former right angle portions, steel slab surface is made to avoid the temperature range very easily occurring transverse crack, bight force-bearing situation also there occurs basic change, and the combined stress suffered by it obviously reduces.Elevated temperature strength and the suffered stress of steel are all well improved on both side, and the probability that transverse crack occurs in steel slab surface bight obviously declines.
But the required key problem solved of chamfer crystallizer technology has three: one to be how to design cooling system, the especially design of crystallizer inner cooling water groove; Two is how to seek best chamfer angle formed by fillet surface and crystallizer leptoprosopy; Three is the optimum widths how seeking fillet surface.Design parameter selects improper meeting to cause slab to produce a large amount of longitudinal crack, time serious, longitudinal crack bleed-out occurs.And above-mentioned three key problems will be solved, method the most frequently used is at present numerical simulation and field experiment, as everyone knows, numerical simulation because of simulation boundary condition limit, often can only analyze qualitatively.Field experiment not only required expense is huge, and very easily occurs bleed-out accident, causes huge economic loss.The cost of once testing about 200,000 yuan.But, the related work adopting chamfer crystallizer simulation system to simulate casting process of not being correlated with by the end of at present.
Summary of the invention
In order to overcome above-mentioned difficulties, the invention provides the application of a kind of continuous casting chamfer crystallizer strand analogue means and this device.This device to draw in also process near meniscus and the change of the temperature in bight by data acquisition system monitoring; by obtaining changes of heat flux near meniscus and bight hot-fluid and warm field situation of change to the computational analysis of temperature; finally above-mentioned change and casting are also comprehensively analyzed on surface; simulate the behavior of the media such as chamfer crystallizer menisci place high temperature protection slag, molten steel and influence each other; and study various heat transfer, mass transfer, phase transformation, the behavior such as to solidify, finally for the exploitation of chamfer crystallizer and design provide reliable basis.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, comprises the descending motor of device (1), vibrating motor (2), positioning motor (3), throwing motor (4), cooling system (5), data collecting system (6), throwing device (7), chamfer crystallizer (8), keeper electrode (9), converter (10), pedestal (29); Described pedestal (29) is provided with two one end perpendicular to support plane, the first screw mandrel that the other end is connected with the descending motor of device (1), the second screw mandrel, described first screw mandrel, the second screw mandrel are provided with and drive by described first screw mandrel, the second screw mandrel the shears vertically moved; Described converter (10) is arranged on described pedestal (29) and goes up and be between described first screw mandrel, the second screw mandrel; Described vibrating motor (2), throwing motor (4) are all arranged on described shears; Throwing device (7) is wrapped in chamfer crystallizer (8); Described chamfer crystallizer (8) vibrates vertically by driving at vibrating motor (2); Positioning motor (3) is connected with keeper electrode (9), and throwing motor (4) is connected with throwing device (7);
Described continuous casting chamfer crystallizer (8) comprises wide of crystallizer (19), crystallizer leptoprosopy (21), fillet surface (20); The outer wall relative with wide of described crystallizer (19) is wide outer wall (13), No. 1 bosh (14) being furnished with first group of thermocouple (23), second group of thermocouple (24) and being connected with cooling system (5) in the space that wide of crystallizer (19) and wide outer wall (13) are formed, the import/export of No. 1 bosh (14) is positioned at the top of continuous casting chamfer crystallizer (8); The outer wall relative with described crystallizer leptoprosopy (21) is leptoprosopy outer wall (18), in the space that wide of crystallizer (19) and wide outer wall (13) are formed, be furnished with No. 2 boshes (15) be connected with cooling system (5), the import/export of No. 2 boshes (15) is positioned at the top of continuous casting chamfer crystallizer (8); Also be provided with perpendicular to the 3rd group of thermocouple (25) of fillet surface (20), the 4th group of thermocouple (26) in described continuous casting chamfer crystallizer (8); Also be provided with No. 3 boshes (16) be connected with cooling system (5) in described continuous casting chamfer crystallizer (8), the import/export of described No. 3 boshes (16) is positioned at the top of continuous casting chamfer crystallizer (8);
Described positioning motor (3) controls keeper electrode (9) and runs.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the angle of the chamfering (17) that fillet surface (20) and crystallizer leptoprosopy (21) are formed is 15 °-50 °, is preferably 30-50 °, more preferably 45 °.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, crystallizer wide (19) width is 15-50mm, is preferably 15-30mm, is further preferably 20mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, crystallizer leptoprosopy (21) width is 15-50mm, is preferably 15-30mm, is further preferably 20mm.To the width of wide of crystallizer (19) and crystallizer leptoprosopy (21) than being 1-1.5:1, being preferably 1-1.2:1, being further preferably 1:1.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, crystallizer wall (22) thickness is 15-20mm, is preferably 20mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, first group of thermocouple (23) is 6-12mm to the vertical range of crystallizer wide (19), is preferably 6-10mm, more preferably 6-8mm; Further be preferably 8mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, second group of thermocouple group (24) is 2-8mm to the vertical range of crystallizer wide (19), is preferably 3-6mm, more preferably 3-5mm; Further be preferably 3mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, first group of thermocouple (23) is 4-8mm to the vertical interval of second group of thermocouple (24), is preferably 4-6mm, more preferably 5mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the 3rd group of thermocouple (25) is 6-12mm to the vertical range of fillet surface (20), is preferably 6-10mm, more preferably 6-8mm; Further be preferably 8mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the 4th group of thermocouple (26) is 2-8mm to the vertical range of fillet surface (20), is preferably 3-6mm, more preferably 3-5mm; Further be preferably 3mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the 3rd group of thermocouple (25) is 4-8mm to the vertical range of the 4th group of thermocouple (26), is preferably 4-6mm, more preferably 5mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the wide of wide outer wall (13) is 30-80mm, is preferably 30-60mm, more preferably 30-50mm, is further preferably 50mm;
The wide of leptoprosopy outer wall (18) is 30-80mm, is preferably 30-60mm, more preferably 30-50mm, is further preferably 50mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the diameter of No. 1 bosh (14) is 6-12mm, is preferably 7-11mm, is further preferably 10mm;
The diameter of No. 2 boshes (15) is 6-12mm, is preferably 7-11mm, is further preferably 10mm;
The diameter of No. 3 boshes (16) is 6-12mm, is preferably 7-11mm, is further preferably 10mm.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, any one bosh chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16) directly connects the water inlet of cooling system (5); All the other two boshes are as delivery port; Or
Any two boshes chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16) directly connect the water inlet of cooling system (5); 1 remaining bosh is as delivery port; Or
The water inlet of cooling system (5) is directly connected with any one bosh chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16); In residue two boshes optional one as delivery port, a remaining bosh is thrown aside.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, first group of thermocouple (23) has n thermocouple to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 1 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in first group of thermocouple (23)
1number thermocouple; 1
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8), is preferably 0.75-0.85:1, more preferably 0.83:1; The ratio of the beeline bottom the thermocouple in first group of thermocouple (23) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8, is preferably 1:3-6, more preferably 4:15; Described n is more than or equal to 4;
Second group of thermocouple (24) has m thermocouple to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 2 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in second group of thermocouple (24)
1number thermocouple; 2
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8), is preferably 0.75-0.85:1, more preferably 0.83:1; The ratio of the beeline bottom the thermocouple in second group of thermocouple (24) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8, is preferably 1:3-6, more preferably 4:15; Described m is more than or equal to 4;
3rd group of thermocouple (25) has p thermocouple to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 3 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 3rd group of thermocouple (25)
1number thermocouple; 3
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8), is preferably 0.75-0.85:1, more preferably 0.83:1; The ratio of the beeline bottom the thermocouple in the 3rd group of thermocouple (25) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8, is preferably 1:3-6, more preferably 4:15; Described p is more than or equal to 4;
4th group of thermocouple (26) has q thermocouple to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 4 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 4th group of thermocouple (26)
1number thermocouple; 4
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8), is preferably 0.75-0.85:1, more preferably 0.83:1; The ratio of the beeline bottom the thermocouple in the 4th group of thermocouple (26) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8, is preferably 1:3-6, more preferably 4:15; Described q is more than or equal to 4;
Described 1
1number thermocouple, 2
1number thermocouple, 3
1number thermocouple, 4
1number thermocouple is equal to the vertical range at chamfer crystallizer (8) top.
A kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the material of described continuous casting chamfer crystallizer (8) is copper material, is preferably red copper.
The application of a kind of continuous casting chamfer crystallizer of the present invention strand analogue means, comprises the following steps:
Step one
Join materials steel grade and covering slag; Added by sample steel grade after dissolving in converter (10), adding covering slag to interior liquid covering slag thickness is 10-15mm, is preferably 10mm;
Step 2
Open positioning motor (3), send keeper electrode (9) to enter in converter (10) in order to demarcate the liquid level of liquid covering slag (11) by positioning motor (3);
Then the descending motor of device (1), sends into the assigned address of converter (10) by throwing device (7); Also just chamfer crystallizer (8) is sent in converter (10) simultaneously; Chamfer crystallizer (8), while feeding, controls its amplitude by vibrating motor (2) and shakes frequently; After chamfer crystallizer (8) enters molten steel, in chamfer crystallizer (8) short transverse, 1
1the bottom of number thermocouple and keeper electrode (9) is at sustained height; When keeper electrode (9) contact high temperature liquid level, low-voltage loop is connected, the position of computer recording now liquid level keeper electrode (9), computer sends operating instruction according to the positional information of liquid level keeper electrode to vibrating motor (2);
While chamfer crystallizer (8) sends into converter (10), open cooling system (5);
While chamfer crystallizer (8) sends into converter (10), by the temperature data of first group of thermocouple (23), second group of thermocouple (24), the 3rd group of thermocouple (25), the 4th group of thermocouple (26) real-time monitored chamfer crystallizer (8);
Step 3
Throwing, during throwing, gathers the operating current data variation of throwing motor (4), then calculates the change in resistance that it is subject to; Simultaneously by first group of thermocouple (23), second group of thermocouple (24), the 3rd group of thermocouple (25), the 4th group of thermocouple (26) real-time monitored chamfer crystallizer (8) temperature data in process of billet withdrawal.
The application of a kind of continuous casting chamfer crystallizer of the present invention strand analogue means, described positioning motor (3) controls keeper electrode (9) and runs downwards, treats that its contact molten steel is just automatically out of service immediately.Throwing motor (4) is connected with throwing device (7); Throwing device (7) is wrapped in chamfer crystallizer (8) and is controlled to insert molten steel by the descending motor of device (1).Its insertion depth is set as compared with the descending 60-80mm in keeper electrode position.Treat that chamfer crystallizer inserts precalculated position, stop 5s clock, make the certain thickness initial base shell of copper mold Surface Creation.Throwing motor (4) starts subsequently, and throwing device (7) runs downwards in molten steel, and copper mold keeps horizontal level motionless.Initial solidification base shell runs downwards along with throwing device (7), constantly has new molten steel contact chamfer crystallizer (8), realizes process of billet withdrawal.In the whole process of plant running, chamfer crystallizer (8) can control its vibration by vibrating motor (2) or non-vibration carries out throwing.
The application of a kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the amplitude of chamfer crystallizer (8) in molten steel is 1-5mm, the frequency that shakes is 60-300 beat/min.
The application of a kind of continuous casting chamfer crystallizer of the present invention strand analogue means, the speed that chamfer crystallizer (8) enters molten steel is 0.5-1.0 m/min.
The application of a kind of continuous casting chamfer crystallizer of the present invention strand analogue means, when chamfer crystallizer (8) reaches desired location, stop 3-10 second, obtaining thickness is after the solidified shell of 1-5mm, is moved downward realize throwing by throwing motor (4) control throwing device (7).
Principle and advantage
Advantages of the present invention is as follows:
1) realize studying the thermodynamics and dynamics of meniscus covering slag, initial solidification shell etc.;
2) independent studies technological parameter is on the impact of solidification of molten steel behavior, covering slag heat transfer, slab quality etc.;
3) impact on solidification of molten steel, cc billet surface quality such as chamfer angle, crystallizer leptoprosopy chamfering width of chamfer crystallizer is studied;
4) cooling condition of crystallizer is studied on the impact of solidification of molten steel behavior, heat transfer, cc billet surface quality.
In sum, the present invention is by adopting continuous casting chamfer crystallizer strand simulation system simulation actual production process, measure change and the changes of heat flux of meniscus place, crystallizer bight copper mold surface temperature under different technical parameters, obtain the molten steel initial solidification base shell with actual strand feature.By designing different chamfer angle, wide of crystallizer and leptoprosopy width, the chamfer crystallizer of fillet surface width can provide most suitable design parameter for production practices, avoids the large cost of plant experiment.And this experiment cost is low, the cycle is short can be verified repeatedly, draws crystallizer size design the most suitable.
Accompanying drawing explanation
Fig. 1 is continuous casting chamfer crystallizer correlation technique High Temperature Simulation system schematic
Fig. 2 is the structural representation of continuous casting chamfer crystallizer
Fig. 3 is the thermocouple distribution map of continuous casting chamfer crystallizer
Fig. 4 is the top view of continuous casting chamfer crystallizer
Fig. 5 is throwing device structural representation
Fig. 6 wide crystallizer experiment base shell
Fig. 7 chamfer crystallizer experiment base shell
In Fig. 1,1 be the descending motor of device, 2 be vibrating motor, 3 be positioning motor, 4 be throwing motor, 5 be cooling system, 6 be data collecting system, 7 be throwing device, 8 be chamfer crystallizer, 9 be keeper electrode, 10 be converter, 11 be liquid covering slag, 12 be molten steel, 29 for pedestal.As can be seen from Figure 1 the descending motor of device (1) jockey support, controls the lifting of chamfer crystallizer (8) and throwing device (7).Keeper electrode (9) lifting has positioning motor (3) to control.Vibrating motor (2) connects chamfer crystallizer (8) by guide rod, and throwing motor (4) connects throwing device (7) by guide rod.Cooling system (5) connects chamfer crystallizer (8) by water pipe.
In Fig. 2,13 be wide outer wall, 14 be No. 1 bosh, 15 be No. 2 boshes, 16 be No. 3 boshes, 17 chamferings formed for fillet surface and crystallizer leptoprosopy, 18 are leptoprosopy outer wall, 19 be wide of crystallizer, 20 be fillet surface, 21 be crystallizer leptoprosopy, 22 be the 4th group of thermocouple for crystallizer wall, 23 be first group of thermocouple, 24 be second group of thermocouple, 25 is the 3rd group of thermocouple, 26;
1
1be the thermocouple to the beeline at chamfer crystallizer (8) top in first group of thermocouple (23), count 1
1number thermocouple;
2
1be thermocouple needle to the beeline at chamfer crystallizer (8) top in second group of thermocouple (24) be 2
1number thermocouple;
3
1be thermocouple needle to the beeline at chamfer crystallizer (8) top in the 3rd group of thermocouple (25) be 3
1number thermocouple;
4
1be thermocouple needle to the beeline at chamfer crystallizer (8) top in the 4th group of thermocouple (26) be 4
1number thermocouple;
In Fig. 2, four groups of thermocouples may be used for the temperature of Real-Time Monitoring chamfer crystallizer (8), can record chamfer crystallizer surface temperature and the change of temperature field, inside through computer calculate.Bosh cooling water flow can regulate in real time.
In Fig. 3,20 be fillet surface, 21 be crystallizer leptoprosopy, 22 be groove for crystallizer wall, 23 be first group of thermocouple, 24 be second group of thermocouple, 25 be the 3rd group of thermocouple, 26 is the 4th group of thermocouple, 27; Thermocouple picks out crystallizer through groove (27); Can find out in Fig. 3 that thermocouple distributes in the inside of chamfer crystallizer (8).
In Fig. 4,14 be No. 1 bosh, 15 be No. 2 boshes, 16 be No. 3 boshes, 23 be first group of thermocouple, 24 be second group of thermocouple, 25 be the 3rd group of thermocouple, 26 be the 4th group of thermocouple, 27 is groove.
In Fig. 5,28 is throwing device baffle.After throwing device (7) is enclosed within and chamfer crystallizer (8) moves to molten steel precalculated position downwards, initial solidification base shell starts to solidify on throwing device baffle (28) and chamfer crystallizer (8).In process of billet withdrawal, chamfer crystallizer (8) relatively molten steel face is motionless, and throwing device (7) relatively molten steel faces down operation.Have certain thickness initial solidification base shell and depart from chamfer crystallizer (8) gradually along with throwing device baffle (28) moves downward, new molten steel is supplemented to chamfer crystallizer (8) surface immediately, simulation casting process.
Strand shown in Fig. 6 and Fig. 7 is steel grade of the same race, the base shell that under identical pouring technology condition, different crystallizer is produced.The former base shell visible shrinks violent, and surface is random uneven.Arrow in figure represents throwing direction.
Detailed description of the invention
Embodiment 1
In embodiment, the brand of thermocouple used is OMEGA, and model is: K type armoured thermocouple, and its diameter is 0.5mm.
In the present embodiment, according to Fig. 1 connecting components, to design chamfer crystallizer according to Fig. 2, Fig. 3, Fig. 4, design throwing device according to Fig. 5.
The angle of chamfering (17) that wherein fillet surface (20) and crystallizer leptoprosopy (21) are formed is 45 °;
Crystallizer wide (19) width is 20mm;
Crystallizer leptoprosopy (21) width is 20mm;
Crystallizer wall (22) thickness is 20mm.
First group of thermocouple (23) is 8mm to the vertical range of crystallizer wide (19);
Second group of thermocouple group (24) is 3mm to the vertical range of crystallizer wide (19);
First group of thermocouple (23) is 5mm to the vertical interval of second group of thermocouple (24);
3rd group of thermocouple (25) is 8mm to the vertical range of fillet surface (20);
4th group of thermocouple (26) is 3mm to the vertical range of fillet surface (20);
3rd group of thermocouple (25) is 5mm to the vertical range of the 4th group of thermocouple (26);
The wide of wide outer wall (13) is 50mm; The wide of leptoprosopy outer wall (18) is 50mm;
The diameter of No. 1 bosh (14) is 10mm;
The diameter of No. 2 boshes (15) is 10mm;
The diameter of No. 3 boshes (16) is 10mm.
Choose No. 1 bosh (14) and directly connect water inlet No. 2 boshes (15) of cooling system (5), No. 3 boshes (16) as delivery port.
First group of thermocouple (23) has 8 thermocouples to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 1 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in first group of thermocouple (23)
1number thermocouple; 1
1number thermocouple is 0.75:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in first group of thermocouple (23) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:6.67;
Second group of thermocouple (24) has 8 thermocouples to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 2 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in second group of thermocouple (24)
1number thermocouple; 2
1number thermocouple is 0.75:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in second group of thermocouple (24) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:6.67;
3rd group of thermocouple (25) has 8 thermocouples to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 3 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 3rd group of thermocouple (25)
1number thermocouple; 3
1number thermocouple is 0.75:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in the 3rd group of thermocouple (25) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:6.67;
4th group of thermocouple (26) has 8 thermocouples to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 4 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 4th group of thermocouple (26)
1number thermocouple; 4
1number thermocouple is 0.75:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in the 4th group of thermocouple (26) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:6.67;
Described 1
1number thermocouple, 2
1number thermocouple, 3
1number thermocouple, 4
1number thermocouple is equal to the vertical range at chamfer crystallizer (8) top.
Concrete operations are as follows:
1) in converter (10), fusing 20Kg tests steel grade, and at 1540 DEG C, be incubated 10 minutes, the company's of making molten steel component is consistent with homogeneous temperature, adds 300 grams of strong deoxidations of aluminium block;
2) then add continuous crystallizer protecting slag corresponding to this steel grade 300 grams, make liquid covering slag thickness in molten bath keep 10mm, and make its temperature and uniform composition;
3) liquid covering slag liquid level is demarcated by liquid level keeper electrode (9), when keeper electrode (9) contact high temperature liquid level, low-voltage loop is connected, the position of computer recording now liquid level keeper electrode (9), computer sends operating instruction according to the positional information of liquid level keeper electrode to the descending motor of device (1);
4) the descending motor of device (1) driving device support moves down, chamfer crystallizer (8) is made to insert molten steel of melting bath (12), under the driving of vibrating motor (2), chamfer crystallizer (8) vibrates with shake (60-300 beat/min) frequently by the amplitude (1-5mm) of setting, crystallizer copper mold internal cooling system (5) water flowing cools, liquid continuous crystallizer protecting slag cools on crystallizer copper mold, forms flux film;
5) liquid molten steel starts to solidify on the chamfer crystallizer (8) having solidified one deck covering slag subsequently, and form initial solidification base shell, along with copper mold constantly runs downwards, covering slag and molten steel solidify in succession on copper mold, and solidified shell constantly grows;
6) when copper mold runs to position (under liquid level the 250-800mm) of setting by the speed (0.5-1.0 m/min) of setting with the time (3-5 second), the liquid level that now topmost the position of a heat extraction galvanic couple and liquid level keeper electrode (9) are demarcated in chamfer crystallizer (8) remains on same plane, after stop certain hour (3-10 second) makes solidified shell have certain thickness (1-5mm), throwing motor (4) control throwing device (7) moves downward and realizes throwing, controls throwing length;
7) in process of billet withdrawal, computer, by gathering the operating current data variation of throwing motor, then calculates the change in resistance that it is subject to.The temperature data that computer is surveyed by data collecting system record thermocouple (23) (24) (25) (26).
8) experiment terminates, and the descending motor of device (1) controls chamfer crystallizer (8) and promotes, pull-out molten steel (12) face.After experiment terminates, the thermo-electric couple temperature data that can record by experiment and box hat external morphology, study the impact on chamfer crystallizer hot-fluid and cc billet surface quality of various continuous casting process and chamfer crystallizer dimensional parameters, these technological parameters comprise: wide of Oscilation Parameters of Mold, crystallizer and crystallizer leptoprosopy size, chamfer angle, crystallizer cooling parameter, casting speed etc.The chamfer crystallizer base shell obtained is as Fig. 7.
Claims (10)
1. a continuous casting chamfer crystallizer strand analogue means, comprises the descending motor of device (1), vibrating motor (2), positioning motor (3), throwing motor (4), cooling system (5), data collecting system (6), throwing device (7), chamfer crystallizer (8), keeper electrode (9), converter (10), pedestal (29); On described pedestal, (29) are provided with two one end perpendicular to support plane, the first screw mandrel that the other end is connected with the descending motor of device (1), the second screw mandrel, described first screw mandrel, the second screw mandrel are provided with and drive by described first screw mandrel, the second screw mandrel the shears vertically moved; Described converter (10) is arranged on described pedestal (29) and goes up and be between described first screw mandrel, the second screw mandrel; Described vibrating motor (2), throwing motor (4) are all arranged on described shears; Throwing device (7) is wrapped in chamfer crystallizer (8); Described chamfer crystallizer (8) vibrates vertically by driving at vibrating motor (2); Positioning motor (3) is connected with keeper electrode (9), and throwing motor (4) is connected with throwing device (7); It is characterized in that: described continuous casting chamfer crystallizer (8) comprises wide of crystallizer (19), crystallizer leptoprosopy (21), fillet surface (20); The outer wall relative with wide of described crystallizer (19) is wide outer wall (13), No. 1 bosh (14) being furnished with first group of thermocouple (23), second group of thermocouple (24) and being connected with cooling system (5) in the space that wide of crystallizer (19) and wide outer wall (13) are formed, the import/export of No. 1 bosh (14) is positioned at the top of continuous casting chamfer crystallizer (8); The outer wall relative with described crystallizer leptoprosopy (21) is leptoprosopy outer wall (18), in the space that wide of crystallizer (19) and wide outer wall (13) are formed, be furnished with No. 2 boshes (15) be connected with cooling system (5), the import/export of No. 2 boshes (15) is positioned at the top of continuous casting chamfer crystallizer (8); Also be provided with perpendicular to the 3rd group of thermocouple (25) of fillet surface (20), the 4th group of thermocouple (26) in described continuous casting chamfer crystallizer (8); Also be provided with No. 3 boshes (16) be connected with cooling system (5) in described continuous casting chamfer crystallizer (8), the import/export of described No. 3 boshes (16) is positioned at the top of continuous casting chamfer crystallizer (8);
Described positioning motor (3) controls keeper electrode (9) and runs.
2. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that: the angle of the chamfering (17) that fillet surface (20) and crystallizer leptoprosopy (21) are formed is 15 ° ~ 50 °.
3. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that:
Crystallizer wide (19) width is 15-50mm;
Crystallizer leptoprosopy (21) width is 15-50mm;
Compare for 1-1.5:1 to wide of crystallizer (19) and the width of crystallizer leptoprosopy (21);
Crystallizer wall (22) thickness is 15-20mm.
4. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that:
First group of thermocouple (23) is 6-12mm to the vertical range of crystallizer wide (19);
Second group of thermocouple group (24) is 2-8mm to the vertical range of crystallizer wide (19);
First group of thermocouple (23) is 4-8mm to the vertical interval of second group of thermocouple (24);
3rd group of thermocouple (25) is 6-12mm to the vertical range of fillet surface (20);
4th group of thermocouple (26) is 2-8mm to the vertical range of fillet surface (20);
3rd group of thermocouple (25) is 4-8mm to the vertical range of the 4th group of thermocouple (26).
5. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that: the wide of wide outer wall (13) is 30-80mm; The wide of leptoprosopy outer wall (18) is 30-80mm.
6. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that:
The diameter of No. 1 bosh (14) is 6-12mm;
The diameter of No. 2 boshes (15) is 6-12mm;
The diameter of No. 3 boshes (16) is 6-12mm.
7. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1, is characterized in that:
Any one bosh chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16) directly connects the water inlet of cooling system (5); All the other two boshes are as delivery port; Or
Any two boshes chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16) directly connect the water inlet of cooling system (5); 1 remaining bosh is as delivery port; Or
The water inlet of cooling system (5) is directly connected with any one bosh chosen in No. 1 bosh (14), No. 2 boshes (15), No. 3 boshes (16); In residue two boshes optional one as delivery port, a remaining bosh is thrown aside.
8. a kind of continuous casting chamfer crystallizer strand analogue means according to claim 1-7 any one, is characterized in that:
First group of thermocouple (23) has n thermocouple to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 1 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in first group of thermocouple (23)
1number thermocouple; 1
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in first group of thermocouple (23) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8; Described n is more than or equal to 4;
Second group of thermocouple (24) has m thermocouple to be arranged in chamfer crystallizer (8) perpendicular to wide of crystallizer (19); Be 2 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in second group of thermocouple (24)
1number thermocouple; 2
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in second group of thermocouple (24) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8; Described m is more than or equal to 4;
3rd group of thermocouple (25) has p thermocouple to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 3 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 3rd group of thermocouple (25)
1number thermocouple; 3
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in the 3rd group of thermocouple (25) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8; Described p is more than or equal to 4;
4th group of thermocouple (26) has q thermocouple to be arranged in chamfer crystallizer (8) perpendicular to fillet surface (20); Be 4 by the thermocouple needle to the beeline at chamfer crystallizer (8) top in the 4th group of thermocouple (26)
1number thermocouple; 4
1number thermocouple is 0.7-0.85:1 to the ratio of the height of the vertical range at chamfer crystallizer (8) top and chamfer crystallizer (8); The ratio of the beeline bottom the thermocouple in the 4th group of thermocouple (26) to chamfer crystallizer (8) and the height of chamfer crystallizer (8) is 1:2.5-8; Described q is more than or equal to 4;
Described 1
1number thermocouple, 2
1number thermocouple, 3
1number thermocouple, 4
1number thermocouple is equal to the vertical range at chamfer crystallizer (8) top.
9. an application for continuous casting chamfer crystallizer strand analogue means as claimed in claim 8, is characterized in that comprising the following steps:
Step one
Join materials steel grade and covering slag; Added by sample steel grade after dissolving in converter (10), adding covering slag to interior liquid covering slag thickness is 10-15mm;
Step 2
Open positioning motor (3), send keeper electrode (9) to enter in converter (10) in order to demarcate the liquid level of liquid covering slag (11) by positioning motor (3);
Then the descending motor of device (1), sends into the assigned address of converter (10) by throwing device (7);
Also just chamfer crystallizer (8) is sent in converter (10) simultaneously; Chamfer crystallizer (8), while feeding, controls its amplitude by vibrating motor (2) and shakes frequently; After chamfer crystallizer (8) enters molten steel, in chamfer crystallizer (8) short transverse, 1
1the bottom of number thermocouple and keeper electrode (9) is at sustained height; When keeper electrode (9) contact high temperature liquid level, low-voltage loop is connected, the position of computer recording now liquid level keeper electrode (9), and computer sends operating instruction according to the positional information of liquid level keeper electrode to vibrating motor (2);
While chamfer crystallizer (8) sends into converter (10), open cooling system (5);
While chamfer crystallizer (8) sends into converter (10), by the temperature data of first group of thermocouple (23), second group of thermocouple (24), the 3rd group of thermocouple (25), the 4th group of thermocouple (26) real-time monitored chamfer crystallizer (8);
Step 3
Throwing, during throwing, gathers the operating current data variation of throwing motor (4), then calculates the change in resistance that it is subject to; Simultaneously by first group of thermocouple (23), second group of thermocouple (24), the 3rd group of thermocouple (25), the 4th group of thermocouple (26) real-time monitored chamfer crystallizer (8) temperature data in process of billet withdrawal.
10. the application of a kind of continuous casting chamfer crystallizer strand analogue means according to claim 9, it is characterized in that: the speed that chamfer crystallizer (8) enters molten steel is 0.5-1.0 m/min, the amplitude of chamfer crystallizer (8) in molten steel be 1-5mm, shaking is 60-300 beat/min frequently.
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| CN115446279A (en) * | 2022-09-06 | 2022-12-09 | 中南大学 | Corner temperature field thermal simulation device of round chamfer crystallizer and application |
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