CN201776415U - Experimental device for dynamic soft reduction of continuous casting - Google Patents
Experimental device for dynamic soft reduction of continuous casting Download PDFInfo
- Publication number
- CN201776415U CN201776415U CN2010205145771U CN201020514577U CN201776415U CN 201776415 U CN201776415 U CN 201776415U CN 2010205145771 U CN2010205145771 U CN 2010205145771U CN 201020514577 U CN201020514577 U CN 201020514577U CN 201776415 U CN201776415 U CN 201776415U
- Authority
- CN
- China
- Prior art keywords
- strand
- dynamically
- continuous casting
- depress
- experimental facilities
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses an experimental device for dynamic soft reduction of continuous casting, and the experimental device comprises a vacuum smelting device, a tundish, a crystallizer, a group of grip rolls and a dynamic soft reduction device, which are arranged according to the reference sequence of a casting blank in vertical posture; and the experimental device further comprises a secondary spraying system for providing secondary cooling for the casting blank located at the group of the grip rolls and the dynamic soft reduction device. By adopting the experimental device, on the one hand, the actions of improving the internal quality of the casting blank of the dynamic soft reduction under different process conditions can be studied, on the other hand, the optimal dynamic soft reduction mode and process parameters can be determined against the different continuous casting process conditions, thereby improving the internal quality of the casting blank.
Description
Technical field
The utility model belongs to the steel-making continuous casting technical field, relates in particular to a kind of experimental facilities that continuous casting is dynamically gently depressed that is used for.
Background technology
Along with the raising of continuous casting level, the technology of gently depressing has become and has solved one of otherwise effective technique of strand center segregation and center porosity.
The so-called solidification shrinkage amount that compensates strand by near the certain drafts of generation of casting blank solidification end, exerting pressure with regard to being meant of gently depressing.Can eliminate or reduce strand on the one hand and shrink the internal voids that forms, prevent that the molten steel of intergranular enrichment solute element from flowing to the strand central cross; On the other hand, gently depressing the squeezing action that is produced can also promote the solute element molten steel of liquid core center enrichment along throwing direction reverse flow, solute element is redistributed in molten steel, thereby the solidified structure that makes strand is even compact more, plays the effect that improves center segregation and reduce center porosity.
Gently depress technology and be in the seventies and shrink development on the basis of roll gap technology and come, can be divided into the technology of dynamically gently depressing that early stage passive light is depressed technology and is rapidly developed in recent years.
Passive light is depressed technology, be gently to depress parameter opening to preestablish before watering, promptly the gap values between rollers of each frame keeps this gap values between rollers constant whole opening in the process of watering, can stably realize the function gently depressed though passive light is depressed, it can't be applicable to complicated continuous casting working condition.And dynamically gently depress technology, and be in continuous casting production process, according to the variation of continuous casting process, dynamically follow the tracks of the variation of casting blank solidification end position, assign a kind of continuous casting process automatic control technology of gently depressing instruction in real time.
Dynamically gently depress under the situation that continuous casting process changes and can react fast, thus the effect that better realization is gently depressed.The technology of dynamically gently depressing has become the important measures that promote modern continuous casting level.
Yet, how to improve center segregation and the center porosity internal mechanism is also had little understanding to dynamically gently depressing at present, there is not consistent theoretical description of generally acknowledging.Once more, owing to dynamically gently depress factor affecting such as experimental cost height and experiment number are few in steel mill, so for dynamically gently depressing the effect that research is difficult to reach stable ideal.
For continuous casting is dynamically gently depressed the research that experimentizes, following two kinds of experimental techniques are arranged at present:
One, adopt model allo (composition is a succinonitrile) to come the analogue simulator strand such as patent documentation CN101710086A at behavior of solidifying of gently depressing and the experimental technique that solidifies mobility status.Because raw material are not molten steel, model allo is sealed in the rectangular cavity and solidifies in addition, is not dynamically gently depressing of carrying out in the process of throwing, and dynamically gently depresses operating mode really and there are differences.
Two, such as the disclosed mold experimental technique of patent documentation CN101363832A.Treat molten steel inject gently depress in the mold after, depress by two faces or four water-cooled copper die faces of casting mould housing, depressing position is fixed, and is not dynamically gently depressing of carrying out in the process of throwing, and dynamically gently depresses operating mode really and there are differences.
Above-described experimental technique, it is gently depressed action and is not carried out real dynamically gently depressing under the operating mode, can not reproduce the technical process of dynamically gently depressing fully.
The utility model content
The purpose of this utility model is to provide a kind of experimental facilities that strand is dynamically gently depressed that is used for, the technical process of dynamically gently depressing with true reappearance and save experimental cost.
For this reason, one side of the present utility model provides a kind of experimental facilities that continuous casting is dynamically gently depressed that is used for, and it comprises: the strand with vertical attitude is vacuum melting equipment, tundish, crystallizer, one group of niproll and the dynamically light screwdown gear that benchmark is disposed in order; And the two cold water spray systems that the secondary cooling is provided to the strand at one group of niproll and dynamically light screwdown gear place.
Further, the width range of the section of above-mentioned strand is 120mm～150mm, and the thickness range of section is 40mm～60mm.
Further, the metallurgical length≤2.5m of above-mentioned experimental facilities.
Further, above-mentioned dynamically light screwdown gear comprises: being positioned at of vertically the arranging stationary roll that strand depresses a plurality of depress rollers of side and be positioned at the strand fixation side is provided with in pairs with a plurality of depress rollers, wherein, depress roller bottom in a plurality of depress rollers is a driven roller, and all the other depress rollers are driven voller; Stationary roll bottom in a plurality of stationary rolls is a driven voller, and all the other stationary rolls are driven roller.
Further, a plurality of depress rollers of above-mentioned dynamically light screwdown gear are 4～6 rollers.
According on the other hand of the present utility model, a kind of experimental technique that continuous casting is dynamically gently depressed that is used for is provided, may further comprise the steps: will be the vaccum sensitive stove melting of putting into the vacuum melting equipment of experimental facilities of the bloom material of principal component, by the crucible upset molten steel is injected chute in the stove, be poured into the molten steel flow in the crystallizer through tundish buffering, control again; When pouring molten steel carries out throwing in crystallizer, after the growth ejection shell, after pulling out the crystallizer suitable length, strand carries out spray cooling but and utilize dynamically gently screwdown gear that strand is dynamically gently depressed; After strand leaves dynamically light screwdown gear, utilize cutter sweep cutting strand, and the strand after the cutting is made sample; And sample is carried out low power test, observe the microstructure evolution situation of casting blank solidification crystallization process, the strand internal soundness that arrives is according to the observation in time adjusted the technological parameter of dynamically gently depressing.
Further, above-mentioned experimental technique also be included in before the melting according to the solidification and heat transfer computation model select casting parameters, with the step in the predetermined metallurgical length scope that metallurgical length is controlled at experimental facilities.
Further, above-mentioned dynamically gently depressing comprises following operating procedure: the state of online acquisition experimental facilities and casting parameters; According to temperature field distribution, solidification end position and the solid rate of solidification and heat transfer computation model calculating strand, select the pressure range of strand and the drafts of interior each depress roller of pressure range; Gently depress strand in pressure range the solidification end position of real-time tracking strand.
By the utility model experimental facilities, can study the improvement behavior of dynamically gently depressing under the different technology conditions on the one hand to the strand internal soundness, analyze to explore dynamically gently to depress and eliminate center segregation and loose essence, and then instruct on-the-spot debugging of dynamically gently depressing technology.On the other hand, by the utility model experimental facilities, can be at different continuous casting process conditions, determine best pattern and the technological parameter dynamically gently depressed, farthest improve segregation of strand inside center and center porosity, thereby increase substantially the strand internal soundness.
Except purpose described above, feature and advantage, other purpose, feature and the advantage that the utlity model has will be described in further detail in conjunction with the accompanying drawings.
Description of drawings
Constitute this specification a part, be used for further understanding accompanying drawing of the present utility model and show preferred embodiment of the present utility model, and be used for illustrating principle of the present utility model with specification.Among the figure:
Fig. 1 shows the schematic diagram that is used for the experimental facilities that continuous casting dynamically gently depresses according to of the present utility model; And
Fig. 2 shows the process chart that is used for the experimental technique of the experimental facilities that continuous casting dynamically gently depresses according to of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
In order under process conditions such as different steel grades, section, pulling rate, dynamically gently to depress research, excavate the mechanism of dynamically gently depressing internal soundness problems such as solving center segregation, loosen, and then for the scene dynamically gently depress the debugging provide the experiment and theoretical direction, the experimental facilities that provides a kind of true reappearance continuous casting dynamically gently to depress is very useful.
Fig. 1 shows the schematic diagram that is used for the experimental facilities that strand dynamically gently depresses according to of the present utility model.As shown in Figure 1, this experimental facilities comprises: vacuum melting equipment 1, tundish 2, crystallizer 3, one group of niproll 4, the dynamically light screwdown gear that is made of 4～6 pair rollers, the strand 8 in one group of niproll 4 and dynamically light screwdown gear provide two cold water spray systems 5 of secondary cooling.The cooled region that is formed by two cold water spray systems is called secondary cooling zone in the utility model.
The core of vacuum melting equipment 1 is a vaccum sensitive stove, and its volume is little, meets very much the requirement to smelting equipment of this experimental facilities.
Wherein, strand 8 is vertical attitude, above-mentioned crystallizer 3, one group of niproll 4 and dynamically light screwdown gear are that benchmark is disposed in order with the strand 8 of vertical attitude, and (40mm～60mm) * (strand 8 of 120mm～150mm) is as the object of experiment to select small bore, to save experimental cost, the control of the sectional dimension of this strand can be realized by crystallizer.
Based on the above-mentioned structure of this experimental facilities and the selection of casting parameters, metallurgical length H can be controlled in 2.5 meters,, use common factory building can arrange this experimental facilities to realize the vertical miniatureization of experimental facilities, each experiment only needs the steel material about 200Kg, and experimental cost is low.In the utility model, metallurgical length H is meant the height of mold liquid level to the strand between the solidification end of strand.
In above-mentioned experimental facilities, one group of niproll 4 is used for clamping strand 8, prevents strand " bulge " and guiding is provided.
Dynamically light screwdown gear comprises a plurality of stationary rolls 7 that are provided with in pairs with depress roller respectively that strand is depressed a plurality of depress rollers 6 of side 8a and is positioned at strand fixation side 8b that are positioned at of vertical arrangement, wherein, depress roller 6b bottom in a plurality of depress rollers 6 is a driven roller, fan-shaped mark is arranged in this roller, all the other depress roller 6a are driven voller, no fan-shaped mark in this roller; Stationary roll 7b bottom in a plurality of stationary rolls 7 is a driven voller, and all the other stationary roll 7a are driven roller 7.
Be arranged to driven roller by the depress roller of next end, other depress roller is set to driven voller, in realizing the process of dynamically gently depressing, has realized the aligning of strand 8 simultaneously.
In addition, this experimental facilities can also comprise: tundish garage walking apparatus, and the dress that is used for tundish changes control; Shake table and mould vibration device, vibrating device adopt servo electric jar control; Steel billet clamping and the mechanism of falling the steel are used for the experiment steel billet is turn to level from plumbness, deliver to cold bed.
Fig. 2 shows the process chart that is used for the experimental technique that continuous casting dynamically gently depresses according to of the present utility model.This experiment is carried out dynamically gently depressing on the experimental facilities according to strand of the present utility model, and this experimental technique comprises following step:
Determine the step S10 of technological parameter: before melting, select casting parameters, with the predetermined metallurgical length scope that metallurgical length is controlled at experimental facilities for example in 2.5 meters scopes.This step can be finished by means of the solidification and heat transfer computation model.
The step S12 of steel material melting: the bloom material of principal component is put into vacuum melting furnace melting (being the melting operation), by the crucible upset molten steel is injected chute in the smelting furnace; Come pour steel (operation of promptly tapping) to crystallizer through tundish buffering control molten steel flow again;
The step S14 of continuous casting and solidifying: when pouring molten steel (is promptly poured into a mould operation) in crystallizer, growth ejection shell (the base shell operation of promptly condensing), carry out throwing (being the throwing operation) afterwards, after strand is pulled out the crystallizer suitable length, spray cooling (being refrigerating work procedure), strand leaves dynamically light screwdown gear (promptly going out blank process) subsequently;
The dynamic step S15 that gently depresses: in execution in step S14, also carry out and dynamically gently depress, it is as follows to implement the concrete operations step dynamically gently depressed: 1, gather and gently depress relevant data, in this step, the state of online acquisition experimental facilities and technological parameter, for example steel grade, pouring temperature, pulling rate, the crystallizer water yield, the secondary cooling raio water yield etc.; 2, determine to depress technology, in this step, calculate temperature field distribution, solidification end position and the solid rate f of strand according to the solidification and heat transfer computation model
s, and calculate the pressure range of strand; 3, gently depress, in this step, real-time tracking solidification end position provides corresponding dynamic and gently depresses control strategy, and gently depresses in view of the above;
The step S16 of sampling: utilize cutter sweep cutting strand (promptly cutting apart the strand operation), and make sample (being the sample making operation) with this; And
The step S18 of sample analysis: sample is carried out the low power experiment, the microstructure evolution situation of observing the casting blank solidification crystallization process, emphasis is center segregation and center porosity etc.The strand internal soundness that arrives according to the observation is in time to dynamically gently depressing technology adjustment.
Embodiment
Steel grade is chosen as Hi-Stren steel Q345B, casting blank section is chosen as 50mm * 150mm, the cooling water inflow of crystallizer is controlled at 700～1600L/min, the secondary cooling raio water yield is controlled at 0.05～0.2L/Kg, pulling rate is controlled at 2.0m/min, pouring temperature is controlled at 1570 ℃, and metallurgical length is controlled in 2.5 meters scopes.
The 200Kg molten steel that comes out from vacuum melting furnace 1 injects in the tundish 2, uses continuous temperature measurement device thermometric by the molten steel to tundish, and the degree of superheat of molten steel is at 10～25 ℃ in the control tundish.
The position of middle water containing opening is mixed up in advance to aim at following crystallizer 3.Molten steel flows in the crystallizer 3 of end opening by the dummy head shutoff.Molten steel along the crystallizer periphery gradually condensation generate the base shell.When casting blank shell goes out crystallizer and has certain thickness, open the drive unit throwing.Strand continues cooled and solidified in secondary cooling zone.
In said process, the state and the technological parameter (steel grade Q345B, 1570 ℃ of pouring temperatures, pulling rate 2.0m/min, the crystallizer water yield, the secondary cooling raio water yield etc.) of online acquisition experiment conticaster are according to temperature field distribution, solidification end position and the solid rate f of solidification and heat transfer computation model calculating strand
s, and according to solid rate f
s=0.4～0.9 pressure range of determining strand is dynamically gently depressed.
After depressing, when the strand throwing to certain-length, the cutting strand utilizes the mechanisms grip of falling steel strand to turn to level from plumbness, delivers to cold bed.Low power experimental study strand internal soundness (center segregation, center porosity etc.) is carried out in sampling at last.With reference to the low power experimental result, based on the orthogonal experiment scheme under the experiment condition, obtain optimal dynamic under each process conditions and gently depress parameter and study it and improve center segregation and center porosity mechanism, gently depressing for the steel mill scene provides theoretical direction and experimental considerations.
By above description as can be seen, the utility model plant area is less relatively, and experimental technique is simple.
By the utility model experimental facilities, can carry out dynamically gently depressing under the different technology conditions experiment easily, from studying the improvement behavior of dynamically gently depressing under the different technology conditions in essence to the strand internal soundness, analyze to explore dynamically gently to depress and eliminate center segregation and loose basic reason, and then the debugging of dynamically gently depressing technology for the scene provides experiment instruction.In addition, can be at different continuous casting process conditions, determine best pattern and the technological parameter dynamically gently depressed, farthest improve segregation of strand inside center and center porosity, thereby increase substantially the strand internal soundness.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (5)
1. one kind is used for the experimental facilities that continuous casting is dynamically gently depressed, and it is characterized in that, comprising:
Strand with vertical attitude is vacuum melting equipment, tundish, crystallizer, one group of niproll and the dynamically light screwdown gear that benchmark is disposed in order; And
Two cold water spray systems of secondary cooling are provided to the strand at described one group of niproll and dynamically light screwdown gear place.
2. according to claim 1ly be used for the experimental facilities that continuous casting is dynamically gently depressed, it is characterized in that the width range of the section of described strand is 120mm～150mm, the thickness range of described section is 40mm～60mm.
3. according to claim 1ly be used for the experimental facilities that continuous casting is dynamically gently depressed, it is characterized in that the metallurgical length≤2.5m of described experimental facilities.
4. according to claim 1ly be used for the experimental facilities that continuous casting is dynamically gently depressed, it is characterized in that described dynamically light screwdown gear comprises:
Being positioned at of vertically the arranging stationary roll that strand depresses a plurality of depress rollers of side and be positioned at the strand fixation side is provided with in pairs with described a plurality of depress rollers,
Wherein, the depress roller bottom in described a plurality of depress rollers is a driven roller, and all the other depress rollers are driven voller; Stationary roll bottom in described a plurality of stationary roll is a driven voller, and all the other stationary rolls are driven roller.
5. according to claim 4ly be used for the experimental facilities that continuous casting is dynamically gently depressed, it is characterized in that a plurality of depress rollers of described dynamically light screwdown gear are 4～6 rollers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205145771U CN201776415U (en) | 2010-08-27 | 2010-08-27 | Experimental device for dynamic soft reduction of continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205145771U CN201776415U (en) | 2010-08-27 | 2010-08-27 | Experimental device for dynamic soft reduction of continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201776415U true CN201776415U (en) | 2011-03-30 |
Family
ID=43789648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205145771U Expired - Lifetime CN201776415U (en) | 2010-08-27 | 2010-08-27 | Experimental device for dynamic soft reduction of continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201776415U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865572A (en) * | 2010-05-26 | 2010-10-20 | 广东欧科空调制冷有限公司 | Fin type heat exchanger and refrigerating mode thereof |
| CN101905299A (en) * | 2010-08-27 | 2010-12-08 | 田陆 | Experimental equipment and experimental method under dynamic soft reduction of continuous casting |
| CN102343426A (en) * | 2011-09-07 | 2012-02-08 | 河北钢铁股份有限公司邯郸分公司 | On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction |
-
2010
- 2010-08-27 CN CN2010205145771U patent/CN201776415U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865572A (en) * | 2010-05-26 | 2010-10-20 | 广东欧科空调制冷有限公司 | Fin type heat exchanger and refrigerating mode thereof |
| CN101905299A (en) * | 2010-08-27 | 2010-12-08 | 田陆 | Experimental equipment and experimental method under dynamic soft reduction of continuous casting |
| CN101905299B (en) * | 2010-08-27 | 2012-12-12 | 田陆 | Experimental equipment and experimental method under dynamic soft reduction of continuous casting |
| CN102343426A (en) * | 2011-09-07 | 2012-02-08 | 河北钢铁股份有限公司邯郸分公司 | On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction |
| CN102343426B (en) * | 2011-09-07 | 2013-06-12 | 河北钢铁股份有限公司邯郸分公司 | On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101781805B1 (en) | Method for the continuous casting of metal strand | |
| CN201776415U (en) | Experimental device for dynamic soft reduction of continuous casting | |
| CN101920323A (en) | Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback | |
| CN104959577A (en) | Method for simulating growth of solidification structure of large ingot under slow cooling condition, and fusion casting experiment apparatus | |
| EP2823914B1 (en) | Continuous casting method and continuous casting device for titanium ingots and titanium alloy ingots | |
| CN106092020B (en) | The test method of melt cinder film thickness in a kind of continuous cast mold | |
| CN102218516A (en) | Continuous casting method of high chrome steel | |
| CN104236977A (en) | Method for judging crystallization ratio of solid slag film of protection slag of continuous casting crystallizer | |
| CN105033213B (en) | Simulating device for casting blanks in continuous casting chamfering crystallizer and application of simulating device | |
| CN106041008A (en) | Initial solidification simulating device and method for molten steel near corner portion of continuous casting crystallizer | |
| CN104023875A (en) | Casting method, more particularly continuous casting method | |
| CN102216003A (en) | Method and device for controlling the solidification of a cast strand in a strand casting plant in startup of the injection process | |
| CN101554650B (en) | Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster | |
| CN101905299B (en) | Experimental equipment and experimental method under dynamic soft reduction of continuous casting | |
| CN101363832A (en) | Casting mold experimental equipment for technology under simulating light press continuous casting blank and method | |
| CN105014033A (en) | Method for simulating solidification structure growth process of continuous cast billet | |
| CN103537642B (en) | A kind of new method controlling continuous cast round billets machine Casting speed | |
| CN204912694U (en) | Continuous casting chamfer crystallizer casting blank analogue means | |
| CN104936724B (en) | The continuous casing for the ingot bar being made up of titanium or titanium alloy | |
| CN104155329A (en) | Continuous casting crystallizer protection slag solidification crystallization property test method | |
| CN114247863B (en) | Control method, system, equipment and medium for secondary cooling device for improving quality of continuous casting billet | |
| CN102222147B (en) | Simulation system for on-line stimulating liquid steel solidification heat-transfer process in continuous-casting crystallizer | |
| CN112536425B (en) | Molten steel solidification and casting blank simulation device for continuous casting funnel-shaped crystallizer and use method of molten steel solidification and casting blank simulation device | |
| CN105014035A (en) | Device for simulating initial solidification of liquid steel in crystallizer | |
| CN102228974B (en) | Method for simulating molten steel solidification heat-transfer process inside continuous casting crystallizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110330 |
|
| CX01 | Expiry of patent term |