CN104057048A - Fan-shaped segment structure and method for realizing continuous casting, solidification and tail end composite pressing of super-thick plate - Google Patents
Fan-shaped segment structure and method for realizing continuous casting, solidification and tail end composite pressing of super-thick plate Download PDFInfo
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Abstract
The invention discloses a fan-shaped segment structure and a method for realizing continuous casting, solidification and tail end composite pressing of a super-thick plate. An inner arc roller, an outer arc roller, an upper framework, a lower framework, a side framework I and a side framework II have sufficient strength and rigidity; four sensors and four oil cylinder assemblies are arranged in the components; the extension or retraction strokes of a first oil cylinder assembly, a second oil cylinder assembly, a third oil cylinder assembly and a fourth oil cylinder assembly are controlled by detecting a first displacement sensor, a second displacement sensor, a third displacement sensor and a fourth displacement sensor, so that the opening degree between the inner arc roller and the outer arc roller of a fan-shaped segment is controlled. The conventional pressing amount and a large compressing amount are implemented according to the solid fractions of different casting blanks, so that continuous casting, solidification and tail end composite pressing of the super-thick plate are realized.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind ofly can realize compound fan-shaped section structure and the method for depressing of special heavy plate continuous casting and solidifying end.
Background technology
Center segregation and loose be one of major defect of continuous casting billet, center segregation and rarefaction defect can cause the quality problems of steel, as the ductility of steel, welding performance, anti-hydrogen induced cracking ability etc.For conventional continuous casting, recent domestic adopts dynamic soft reduction technology, greatly reduces or has eliminated the center segregation of strand and loosened.But, for special heavy plate continuous casting, because conticaster pulling rate is low, the reasons such as casting blank solidification end base shell is thick, and casting blank deformation drag is large, while adopting routine gently to depress, the improvement of its center segregation of casting blank and rarefaction defect is also not obvious, develop the compound Reduction Technology of solidification end for this reason, make center segregation of casting blank and loose significantly reduction, plate flaw detection qualification rate is significantly improved.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the object of the present invention is to provide and a kind ofly can realize the compound fan-shaped section structure of depressing of special heavy plate continuous casting and solidifying end, a kind of new compound Reduction Technology of special heavy plate continuous casting and solidifying end, i.e. gently depress+heavy reduction of routine; When cast extra-thick plate blank, center segregation of casting blank and rarefaction defect are significantly reduced, improve the internal soundness of strand and the flaw detection qualification rate of rolled plate, and effectively reduce rolling compression ratio.
In order to achieve the above object, the technical solution that the present invention adopts is:
Realize the compound fan-shaped section structure of depressing of special heavy plate continuous casting and solidifying end, comprise inner arc roller 8, inner arc roller 8 is connected with upper frame 1 by bolt, and outer arc roller 9 is connected with underframe 5 by bolt; Upper frame 1 is connected with the first guide plate 31, the 3rd guide plate 33, the 5th guide plate 35, the 7th guide plate 37 by bolt; The second guide plate 32, the 4th guide plate 34 are connected with the first body side frame 4 by bolt; The 6th guide plate 36, the 8th guide plate 38 are connected with the second body side frame 26 by bolt; The first body side frame 4 is connected with underframe 5 respectively by bolt with the second body side frame 26; First oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder assembling 21 is connected with upper frame 1 respectively by bolt; The first displacement transducer 2 and the first oil cylinder assemble 3 assembly connections; Second displacement sensor 6 and the second oil cylinder assemble 7 assembly connections; Triple motion sensor 10 and the 3rd oil cylinder assemble 11 assembly connections; The 4th displacement transducer 20 and the 4th oil cylinder assemble 21 assembly connections; The first oil cylinder assembling 3 is threaded with the second joint 16; The second joint 16 is connected with second connecting rod 18 by the second bearing pin 17; Second connecting rod 18 and the 3rd bearing pin 19 assembly connections; The 3rd bearing pin 19 and underframe 5 assembly connections; The second oil cylinder assembling 7 is threaded with the 4th joint 27; The 4th joint 27 is connected with the 4th connecting rod 29 by the 6th bearing pin 28; The 4th connecting rod 29 and the 7th bearing pin 30 assembly connections; The 7th bearing pin 30 and underframe 5 assembly connections; The 3rd oil cylinder assembling 11 is threaded with the first joint 12; The first joint 12 is connected with first connecting rod 14 by the first bearing pin 13; First connecting rod 14 and the 8th bearing pin 15 assembly connections; The 8th bearing pin 15 and underframe 5 assembly connections; The 4th oil cylinder assembling 21 is threaded with the 3rd joint 22; The 3rd joint 22 is connected with third connecting rod 24 by the 4th bearing pin 23; Third connecting rod 24 and the 5th bearing pin 25 assembly connections; The 5th bearing pin 25 and underframe 5 assembly connections.
Between the first guide plate 31 and the second guide plate 32, gap is 0-2mm; Between the 3rd guide plate 33 and the 4th guide plate 34, gap is 0-2mm; Between the 5th guide plate 35 and the 6th guide plate 35, gap is 0-2mm; Between the 7th guide plate 37 and the 8th guide plate 38, gap is 0-2mm.
The compound method of depressing of special heavy plate continuous casting and solidifying end that realizes based on said structure, comprises the following steps:
Step 1, strand enter fan-shaped section structure, adopt two cold heat transfer SOLIDIFICATION MODEL to calculate strand center solid rate f
s, f
s=(TL-T)/and (TL-TS), TL represents strand liquidus temperature, and T represents strand central temperature, and TS represents strand solidus temperature;
Step 2, at strand center solid rate f
s=0.3～0.7 region, by the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20 detects fan-shaped section opening degree, control the first oil cylinder assembling 3, the second oil cylinder assembling 7, the 3rd oil cylinder assembling 11, the 4th oil cylinder assembles 21 retraction strokes, and then the opening degree between control fan-shaped section inner arc roller 8 and outer arc roller 9, implementing routine gently depresses, drafts is 0～6mm, do not comprise 0mm, in 2～3 fan-shaped section, complete, reduction ratio is 0～1.5mm/m, do not comprise 0mm/m, reduction ratio=drafts/depress length, at strand center solid rate f
s> 0.7 region, by the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, detect fan-shaped section opening degree, control first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder and assemble 21 retraction strokes, and then the opening degree between control fan-shaped section inner arc roller 8 and outer arc roller 9, implement heavy reduction, drafts 3.5～10mm, be set in 1 fan-shaped section or in 1～6 pinch roll, complete reduction ratio 1.5～5mm/m.
Feature of the present invention is:
1) on the basis of gently depressing in routine, implement heavy reduction and depress approaching casting blank solidification end, reduce the center porosity that molten steel produces due to volume contraction during latter stage at casting blank solidification, improve the flaw detection qualification rate of rolled plate, and effectively reduce rolling compression ratio.
2) inner arc roller 8, outer arc roller 9, upper frame 1, underframe 5, body side frame 4 and body side frame 26 have enough strength and stiffness, the resistance of deformation of strand in the time of can bearing heavy reduction.
3) hydraulic system can provide enough pressure, the required power of depressing when meeting heavy reduction.
Accompanying drawing explanation
Fig. 1 is fan-shaped section front view of the present invention.
Fig. 2 is that A is to view.
Fig. 3 is that B is to view.
Fig. 4 is C-C view.
Fig. 5 is D-D view.
Fig. 6 is that E is to view.
Fig. 7 is the segregation result figure that embodiment mono-depresses rear strand.
Fig. 8 is the segregation result figure that comparative example is depressed rear strand.
Specific implementation method
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Referring to accompanying drawing 1-Fig. 6, realize the compound fan-shaped section structure of depressing of special heavy plate continuous casting and solidifying end, comprise inner arc roller 8, inner arc roller 8 is connected with upper frame 1 by bolt, and outer arc roller 9 is connected with underframe 5 by bolt; Upper frame 1 is connected with the first guide plate 31, the 3rd guide plate 33, the 5th guide plate 35, the 7th guide plate 37 by bolt; The second guide plate 32, the 4th guide plate 34 are connected with the first body side frame 4 by bolt; The 6th guide plate 36, the 8th guide plate 38 are connected with the second body side frame 26 by bolt; The first body side frame 4 is connected with underframe 5 respectively by bolt with the second body side frame 26; First oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder assembling 21 is connected with upper frame 1 respectively by bolt; The first displacement transducer 2 and the first oil cylinder assemble 3 assembly connections; Second displacement sensor 6 and the second oil cylinder assemble 7 assembly connections; Triple motion sensor 10 and the 3rd oil cylinder assemble 11 assembly connections; The 4th displacement transducer 20 and the 4th oil cylinder assemble 21 assembly connections; The first oil cylinder assembling 3 is threaded with the second joint 16; The second joint 16 is connected with second connecting rod 18 by the second bearing pin 17; Second connecting rod 18 and the 3rd bearing pin 19 assembly connections; The 3rd bearing pin 19 and underframe 5 assembly connections; The second oil cylinder assembling 7 is threaded with the 4th joint 27; The 4th joint 27 is connected with the 4th connecting rod 29 by the 6th bearing pin 28; The 4th connecting rod 29 and the 7th bearing pin 30 assembly connections; The 7th bearing pin 30 and underframe 5 assembly connections; The 3rd oil cylinder assembling 11 is threaded with the first joint 12; The first joint 12 is connected with first connecting rod 14 by the first bearing pin 13; First connecting rod 14 and the 8th bearing pin 15 assembly connections; The 8th bearing pin 15 and underframe 5 assembly connections; The 4th oil cylinder assembling 21 is threaded with the 3rd joint 22; The 3rd joint 22 is connected with third connecting rod 24 by the 4th bearing pin 23; Third connecting rod 24 and the 5th bearing pin 25 assembly connections; The 5th bearing pin 25 and underframe 5 assembly connections.
Between the first guide plate 31 and the second guide plate 32, gap is 0-2mm; Between the 3rd guide plate 33 and the 4th guide plate 34, gap is 0-2mm; Between the 5th guide plate 35 and the 6th guide plate 35, gap is 0-2mm; Between the 7th guide plate 37 and the 8th guide plate 38, gap is 0-2mm.
The operation principle of this fan-shaped section structure is:
It is as a whole that structure of the present invention connects into fan-shaped section.During work, by the detection to the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, control stretching out or retraction stroke of first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder assembling 21, and then control the opening degree between fan-shaped section inner arc roller 8 and outer arc roller 9, realize compound the depressing of special heavy plate continuous casting and solidifying end.
During to compound the depressing of special heavy plate continuous casting and solidifying end.
1) first, determine the position of casting blank solidification end.Can adopt heat transfer model to calculate solidification end position or by completely solid-state and process with the different pressures inverse signal of liquid core strand, determine solidification end position, finally by shoot-pin test, proofreading and correct the accurate location of solidification end.
2) determine pressure range, drafts and reduction ratio.
Calculate strand center solid rate f
s=(TL-T)/(TL-TS);
At strand center solid rate f
s=0.3～0.7 region, implements routine and gently depresses, and drafts 0～6mm completes reduction ratio 0～1.5mm/m in 2～3 fan-shaped section;
At strand center solid rate f
s=0.75～0.95 region, implements heavy reduction, and drafts 3.5～10mm, is set in 1 fan-shaped section or in 1～6 pinch roll, completes reduction ratio 1.5～5mm/m.
3) determine fan-shaped section action rules: by overall reduction and the relevant reduction parameters set, import and the outlet roller of each fan-shaped section of take is control module, along casting flow path direction, depresses piecemeal.
4) while pouring into a mould, strand enters from fan-shaped section import, export out, when strand is carried out to compound depressing, by the detection to the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, control stretching out or retraction stroke of first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder assembling 21, and then control the opening degree between fan-shaped section inner arc roller 8 and outer arc roller 9, realize compound the depressing of special heavy plate continuous casting and solidifying end.
Embodiment mono-
The compound method of depressing of special heavy plate continuous casting and solidifying end that realizes based on said structure: comprise the following steps:
Step 1, strand enter fan-shaped section structure, and slab thickness is 300mm, width 2100mm, and steel grade Q345-B, pulling rate 0.95m/min, adopts two cold heat transfer SOLIDIFICATION MODEL to calculate strand center solid rate f
s, f
s=(TL-T)/and (TL-TS), TL represents strand liquidus temperature, and T represents strand central temperature, and TS represents strand solidus temperature;
Step 2, at strand center solid rate f
s=0.53 region, by the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, detect fan-shaped section opening degree, control first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder and assemble 21 retraction strokes, and then the opening degree between control fan-shaped section inner arc roller 8 and outer arc roller 9, implementing routine gently depresses, drafts is 3.2mm, in 2 fan-shaped section, completes, and reduction ratio is 0.8mm/m; At strand center solid rate f
s=0.83 region, by the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, detect fan-shaped section opening degree, control first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder and assemble 21 retraction strokes, and then the opening degree between control fan-shaped section inner arc roller 8 and outer arc roller 9, implement heavy reduction, drafts 7.2mm, is set in 1 fan-shaped section and completes, reduction ratio 2.88mm/m.
Comparative example
Only adopt conventional Reduction Technology to depress it strand of embodiment mono-, comprise the following steps:
Step 1, strand enter fan-shaped section structure, and slab thickness is 300mm, width 2100mm, and steel grade Q345-B, pulling rate 0.95m/min, adopts two cold heat transfer SOLIDIFICATION MODEL to calculate strand center solid rate f
s, f
s=(TL-T)/and (TL-TS), TL represents strand liquidus temperature, and T represents strand central temperature, and TS represents strand solidus temperature;
Step 2, at strand center solid rate f
s=0.53 region, by the first displacement transducer 2, second displacement sensor 6, triple motion sensor 10, the 4th displacement transducer 20, detect fan-shaped section opening degree, control first oil cylinder assembling the 3, second oil cylinder assembling the 7, the 3rd oil cylinder assembling the 11, the 4th oil cylinder and assemble 21 retraction strokes, and then the opening degree between control fan-shaped section inner arc roller 8 and outer arc roller 9, implementing routine gently depresses, drafts is 3.2mm, in 2 fan-shaped section, completes, and reduction ratio is 0.8mm/m; At strand center solid rate f
s=0.83 region, does not depress.
With reference to Fig. 7, Fig. 8, as can be seen from Figure 7, implement after compound depressing, strand segregation grade is C class 1.0, as can be seen from Figure 8, after enforcement routine is depressed, strand segregation grade is category-A 2.0, by contrast, draws, the present invention has alleviated center porosity and the segregation of strand, improve the flaw detection qualification rate of rolled plate, and effectively reduce rolling compression ratio.
In figure: 1-upper frame; 2-the first displacement transducer; 3-the first oil cylinder assembling; 4-body side frame; 5-underframe; 6-second displacement sensor; 7-the second oil cylinder assembling; 8-inner arc roller; 9-outer arc roller; 10-triple motion sensor; 11-the 3rd oil cylinder assembling; 12-the first joint; 13-the first bearing pin; 14-first connecting rod; 15-the 8th bearing pin; 16-the second joint; 17-the second bearing pin; 18-second connecting rod; 19-the 3rd bearing pin; 20-the 4th displacement transducer; 21-the 4th oil cylinder assembling; 22-the 3rd joint; 23-the 4th bearing pin; 24-third connecting rod; 25-the 5th bearing pin; 26-body side frame; 27-the 4th joint; 28-the 6th bearing pin; 29-the 4th connecting rod; 30-the 7th bearing pin; 31-the first guide plate; 32-the second guide plate; 33-the 3rd guide plate; 34-the 4th guide plate; 35-the 5th guide plate; 36-the 6th guide plate; 37-the 7th guide plate; 38-the 8th guide plate.
Claims (3)
1. can realize the compound fan-shaped section structure of depressing of special heavy plate continuous casting and solidifying end for one kind, it is characterized in that, comprise inner arc roller (8), inner arc roller (8) is connected with upper frame (1) by bolt, and outer arc roller (9) is connected with underframe (5) by bolt; Upper frame (1) is connected with the first guide plate (31), the 3rd guide plate (33), the 5th guide plate (35), the 7th guide plate (37) by bolt; The second guide plate (32), the 4th guide plate (34) are connected with the first body side frame (4) by bolt; The 6th guide plate (36), the 8th guide plate (38) are connected with the second body side frame (26) by bolt; The first body side frame (4) is connected with underframe (5) respectively by bolt with the second body side frame (26); The first oil cylinder assembling (3), the second oil cylinder assembling (7), the 3rd oil cylinder assembling (11), the 4th oil cylinder assembling (21) are connected with upper frame (1) respectively by bolt; The first displacement transducer (2) and first oil cylinder assembling (3) assembly connection; Second displacement sensor (6) and second oil cylinder assembling (7) assembly connection; Triple motion sensor (10) and the 3rd oil cylinder assembling (11) assembly connection; The 4th displacement transducer (20) and the 4th oil cylinder assembling (21) assembly connection; The first oil cylinder assembling (3) is threaded with the second joint (16); The second joint (16) is connected with second connecting rod (18) by the second bearing pin (17); Second connecting rod (18) and the 3rd bearing pin (19) assembly connection; The 3rd bearing pin (19) and underframe (5) assembly connection; The second oil cylinder assembling (7) is threaded with the 4th joint (27); The 4th joint (27) is connected with the 4th connecting rod (29) by the 6th bearing pin (28); The 4th connecting rod (29) and the 7th bearing pin (30) assembly connection; The 7th bearing pin (30) and underframe (5) assembly connection; The 3rd oil cylinder assembling (11) is threaded with the first joint (12); The first joint (12) is connected with first connecting rod (14) by the first bearing pin (13); First connecting rod (14) and the 8th bearing pin (15) assembly connection; The 8th bearing pin (15) and underframe (5) assembly connection; The 4th oil cylinder assembling (21) is threaded with the 3rd joint (22); The 3rd joint (22) is connected with third connecting rod (24) by the 4th bearing pin (23); Third connecting rod (24) and the 5th bearing pin (25) assembly connection; The 5th bearing pin (25) and underframe (5) assembly connection.
2. according to claim 1ly a kind ofly can realize the compound fan-shaped section structure of depressing of special heavy plate continuous casting and solidifying end, it is characterized in that, between the first guide plate (31) and the second guide plate (32), gap is 0-2mm; Between the 3rd guide plate (33) and the 4th guide plate (34), gap is 0-2mm; Between the 5th guide plate (35) and the 6th guide plate (35), gap is 0-2mm; Between the 7th guide plate (37) and the 8th guide plate (38), gap is 0-2mm.
3. realize the compound method of depressing of special heavy plate continuous casting and solidifying end: comprise the following steps:
Step 1, strand enter fan-shaped section structure, adopt two cold heat transfer SOLIDIFICATION MODEL to calculate strand center solid rate f
s, f
s=(TL-T)/and (TL-TS), TL represents strand liquidus temperature, and T represents strand central temperature, and TS represents strand solidus temperature;
Step 2, at strand center solid rate f
s=0.3～0.7 region, by the first displacement transducer (2), second displacement sensor (6), triple motion sensor (10), the 4th displacement transducer (20) detects fan-shaped section opening degree, control the first oil cylinder assembling (3), the second oil cylinder assembling (7), the 3rd oil cylinder assembling (11), the 4th oil cylinder assembling (21) retraction stroke, and then the opening degree between control fan-shaped section inner arc roller (8) and outer arc roller (9), implementing routine gently depresses, drafts is 0～6mm, do not comprise 0mm, in 2～3 fan-shaped section, complete, reduction ratio is 0～1.5mm/m, do not comprise 0mm/m, reduction ratio=drafts/depress length, at strand center solid rate f
s> 0.7 region, by the first displacement transducer (2), second displacement sensor (6), triple motion sensor (10), the 4th displacement transducer (20) detects fan-shaped section opening degree, control the first oil cylinder assembling (3), the second oil cylinder assembling (7), the 3rd oil cylinder assembling (11), the 4th oil cylinder assembling (21) retraction stroke, and then the opening degree between control fan-shaped section inner arc roller (8) and outer arc roller (9), implement heavy reduction, drafts 3.5～10mm, be set in (1) individual fan-shaped section or complete in 1～6 pinch roll, reduction ratio 1.5～5mm/m.
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| CN201410289529.XA CN104057048B (en) | 2014-03-27 | 2014-06-24 | Realize special heavy plate continuous casting and solidifying end and be combined fan-shaped section structure and the method for pressure |
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| CN2014101230509 | 2014-03-27 | ||
| CN201410123050.9A CN103878331A (en) | 2014-03-27 | 2014-03-27 | Sector segment structure capable of compositely pressing continuous casting solidification tail end of extra-thick plate |
| CN201410123050.9 | 2014-03-27 | ||
| CN201410289529.XA CN104057048B (en) | 2014-03-27 | 2014-06-24 | Realize special heavy plate continuous casting and solidifying end and be combined fan-shaped section structure and the method for pressure |
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| CN201410289529.XA Active CN104057048B (en) | 2014-03-27 | 2014-06-24 | Realize special heavy plate continuous casting and solidifying end and be combined fan-shaped section structure and the method for pressure |
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| CN104858383A (en) * | 2015-06-10 | 2015-08-26 | 中冶连铸技术工程有限责任公司 | Slab pressing segment |
| CN106670414A (en) * | 2016-10-26 | 2017-05-17 | 首钢总公司 | Set method of fixed segment depressing continuous caster depressing mode |
| CN106925738A (en) * | 2017-04-01 | 2017-07-07 | 唐山钢铁集团有限责任公司 | The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity |
| CN107081413A (en) * | 2017-04-01 | 2017-08-22 | 唐山钢铁集团有限责任公司 | The method for improving Steels for High Rise Buildings continuous casting billet central dense degree |
| CN107081412A (en) * | 2017-04-01 | 2017-08-22 | 唐山钢铁集团有限责任公司 | The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base |
| CN107081412B (en) * | 2017-04-01 | 2019-08-09 | 唐山钢铁集团有限责任公司 | The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base |
| CN114669723A (en) * | 2022-03-21 | 2022-06-28 | 江阴兴澄特种钢铁有限公司 | Control method for effective reduction interval of casting blank |
| CN116422852A (en) * | 2023-06-12 | 2023-07-14 | 中国重型机械研究院股份公司 | Seven-roller large-reduction sector control model for continuous casting of super-thick plate |
| CN116422852B (en) * | 2023-06-12 | 2023-11-17 | 中国重型机械研究院股份公司 | Seven-roller large-reduction sector control model for continuous casting of super-thick plate |
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| CN104057048B (en) | 2016-09-28 |
| CN103878331A (en) | 2014-06-25 |
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