CN101363832A - Casting mold experimental equipment for technology under simulating light press continuous casting blank and method - Google Patents
Casting mold experimental equipment for technology under simulating light press continuous casting blank and method Download PDFInfo
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- CN101363832A CN101363832A CNA2008101198194A CN200810119819A CN101363832A CN 101363832 A CN101363832 A CN 101363832A CN A2008101198194 A CNA2008101198194 A CN A2008101198194A CN 200810119819 A CN200810119819 A CN 200810119819A CN 101363832 A CN101363832 A CN 101363832A
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Abstract
The invention belongs to the steelmaking continuous casting technical field, and particularly provides a mold casting experimental device and a method thereof for simulating the soft-reduction technique of a continuous casting blank. The device is characterized in that the inner wall of a water-cooling copper mold can move; displacement signals can be acquired and recorded; and by the soft-reduction mold casting, the solidification process of the continuous casting blank under different soft-reduction process parameters can be stimulated. The structure evolution rule of the continuous casting blank is studied, and the influencing factors on the crack generation and central looseness of the casting blank are analyzed. During the experiment process, the macroscopic deformation rule of the continuous casting blank during the continuous casting process using the soft-reduction process is analyzed by the variation of the soft-reduction force, the soft-reduction total amount and the soft-reduction rate. By the metallurgical analysis, the action of the soft-reduction process on the enlargement of a central equiaxial crystal zone, the central looseness and segregation and the variation of the structure growth process is determined. By the soft-reduction experiments in different solid rate sections using the two-side and four-side soft-reduction processes, the reasonable soft-reduction process parameters during the continuous casting process are determined.
Description
Technical field:
The invention belongs to the steel-making continuous casting technical field, a kind of casting mold experimental equipment and method that is used for technology under simulating light press continuous casting blank particularly is provided.
Background technology:
Gently depress technology and be in the seventies and shrink development on the basis of roll gap technology and come, divide in choosing under the effect of crystallization, the liquid of strand end can't effectively add to front end, form negative pressure between " brilliant bridge ", liquid between dendrite forms comparatively serious center segregation and loose to the strand center flow.In continuous casting billet solidification processing, strand is applied external force, and compensation solidification shrinkage and broken " the brilliant bridge " that has formed make that the molten steel in the strand can flow freely, just can farthest reduce center segregation and loose, Here it is gently depresses the technological principle of technology.
At the beginning of 90 year age, use on cut deal base and thin-slab caster and gently depress technology, fundamental purpose is the attenuate slab thickness, obtains optimum economic benefit so that can mate better with milling train.But along with alloy steel continuous casting Study on Technology and development, people recognize gradually, by compensation solidification shrinkage and expansion equiax crystal district, center, gently depress technology and can effectively alleviate macrosegregation of strand center and semimacrosegregation.
Enter this century,, proposed dynamically gently to depress technology conception along with the progress of remote control technology.It is pre-set roll gap before the casting that passive light is depressed, and pours into a mould according to pulling rate and the process conditions set; Dynamically gently depress is can solidify a kind of pouring procedure that terminal point also can be adjusted the roll gap shrinkage degree with the variation of terminal point from motion tracking " liquid core " according to the variation of technological parameter in casting cycle.At present, dynamically gently depress method and also just be in conceptual phase.Yet there are no the example of application.
At present, the research about the microstructure in the casting process develops particularly changes in the metallographic structure of gently depressing strand, also only is confined to the analysis of macrostructure, for the forming core of crystal grain, grow up and research such as phase transformation also lacks certain laboratory facilities.Therefore be necessary very much to develop the mold that has press function, simulate continuous casting billet at the forming core of gently depressing crystal grain under the technology, grow up and the rule of phase transformation, so that rules such as inner loose, the segregation of research better.
Summary of the invention:
The object of the present invention is to provide a kind of experimental facilities and experimental technique, can simulate continuous casting billet and gently depress process of setting under the technological parameter, as shown in Figure 1 in difference.By this method and equipment, can study the microstructure evolution rule of continuous casting billet, and analyze that strand cracks and the influence factor of center porosity.By two sides and four sides gently depress technology different solid rate sections gently depress test, determine gently to depress technological parameter in the rational casting process.
A kind of being used to simulated the technology casting mold experimental equipment that continuous casting billet is gently depressed, and it is characterized in that experimental facilities comprises 1 water inlet, 2 water delivering orifices, 3 water cooled copper moulds, 4 displacement transducers, 5 mold frameworks, 6 screwdown gears, water cooled copper mould adopts move mode, copper mold can move inward with given pace, and can control different drafts stage by stage, and displacement transducer can be passed to collector by the copper mold displacement signal, the water cooled copper mould inwall can move by two faces together, also can move together by four faces.
A kind ofly be used to simulate the technology mold experimental technique that continuous casting billet is gently depressed, cooperate with vacuum drying oven and to cast, according to concrete experimental design, feed the chilled water of certain flow, gently depress melted molten steel injection in the mold, when treating that molten steel injects certain depth, open screwdown gear (can select two sides or four sides gently to depress technology), according to requirement of experiment technological parameter (light depressing position is set, drafts, depress speed, depress power etc.), open displacement sensing apparatus simultaneously, gather displacement signal in real time, amount of contraction in the casting blank solidification process under the record different technical parameters is after the casting blank solidification cooling, to the sampling of cutting into slices behind the casting blank solidification, observe the microstructure evolution situation of the solidification and crystallization process by using of strand, emphasis is a center segregation, the inner situations such as reaching crackle of loosening.
In process of the test,, analyze continuous casting billet is used strand macroscopic deformation when gently depressing technology in casting process rule by gently depressing power, gently depressing total amount and gently depress rate variations.
By metallographic examination, confirm gently to depress the effect of technology to enlarging equiax crystal district, center, alleviating center porosity and segregation and change tissue growth process.
The research continuous casting billet is in the development law of dynamically gently depressing microstructure, and different technical parameters is to the influence of strand center porosity, segregation, crackle etc., and then can apply continuous casting billet and rationally gently depress technological parameters such as power, straightening force.
Determine reasonably gently to depress mode and gently to depress technological parameter, reduce or eliminate segregation of strand inside center and loose phenomenon, the continuous casting billet that makes as-cast structure is to the rolling structure transition, thereby increases substantially the continuous casting billet internal soundness.
The invention has the advantages that: by this experimental facilities and experimental technique, can study and gently depress technology alloy steel continuous casting macromechanics characteristic and microstructure development law, enriched the high temperature strand, particularly consolidating of strand---the rheological theory of liquid two-phase region and the development law of microstructure etc. are for numerical simulation, the forecast of liquid core, breakout prediction lay the foundation.Simultaneously to continuous casting billet gently depress technology, straightening process, to sheet blank continuous casting---omnidistance soft (gently) of tandem rolling depresses technology and casting---technology of rolling provides theoretical foundation.Therefore have important theory and practical significance.
Description of drawings
Fig. 1 is the synoptic diagram that the present invention gently depresses mold, and wherein, 1 is water inlet, and 2 is water delivering orifice, and 3 is water cooled copper mould, and 4 is displacement transducer, and 5 is the mold framework, and 6 is screwdown gear.
Embodiment
When experimentizing, according to concrete experimental design, feed the chilled water of certain flow, gently depress melted molten steel injection in the mold, when treating that molten steel injects certain depth, open screwdown gear (can select two sides or four sides gently to depress technology), according to requirement of experiment technological parameter (light depressing position is set, drafts, depress speed, depress power etc.), open displacement sensing apparatus simultaneously, gather displacement signal in real time, amount of contraction in the casting blank solidification process under the record different technical parameters, after the casting blank solidification cooling, to the sampling of cutting into slices behind the casting blank solidification, observe the microstructure evolution situation of the solidification and crystallization process by using of strand, emphasis is a center segregation, the inner situations such as reaching crackle of loosening.
Claims (2)
1. a casting mold experimental equipment that is used for technology under simulating light press continuous casting blank is characterized in that experimental facilities comprises that (1) is water inlet, and (2) are water delivering orifice, (3) be water cooled copper mould, (4) are displacement transducer, and the copper mold displacement signal is passed to collector, (5) be the mold framework, (6) screwdown gear; Water cooled copper mould adopts move mode, copper mold can move inward according to the speed of design, and can control different drafts stage by stage, and displacement transducer can be passed to collector by the copper mold displacement signal, two faces of wall energy move together in the water cooled copper mould, also can move together by four faces.
2. mold experimental technique that is used for technology under simulating light press continuous casting blank, it is characterized in that cooperating and cast with vacuum drying oven, according to concrete experimental design, feed chilled water, gently depress melted molten steel injection in the mold, when treating that molten steel injects the designing requirement degree of depth, open screwdown gear, according to requirement of experiment technological parameter is set, comprise light depressing position, drafts, depress speed, depress power, open displacement sensing apparatus simultaneously, gather displacement signal in real time, amount of contraction in the casting blank solidification process under the record different technical parameters; After the casting blank solidification cooling, to the sampling of cutting into slices behind the casting blank solidification, observe the microstructure evolution situation of the solidification and crystallization process by using of strand, emphasis is center segregation, inner loose and crackle situation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008101198194A CN101363832B (en) | 2008-09-11 | 2008-09-11 | Casting mold experimental equipment for technology under simulating light press continuous casting blank and method |
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| CN2008101198194A CN101363832B (en) | 2008-09-11 | 2008-09-11 | Casting mold experimental equipment for technology under simulating light press continuous casting blank and method |
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| CN101363832A true CN101363832A (en) | 2009-02-11 |
| CN101363832B CN101363832B (en) | 2012-05-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601324A (en) * | 2012-03-14 | 2012-07-25 | 北京科技大学 | High-temperature experimental apparatus and method for research on mechanism of continuous casting soft-reduction |
| CN104772444A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Control method for reducing tail shrinkage hole of square billet |
| CN104870121A (en) * | 2013-09-30 | 2015-08-26 | 新日铁住金工程技术株式会社 | Soft reduction method for continuous casting piece |
| CN105891437A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Method for evaluating macrosegregation of continuous casting blank |
| CN111679052A (en) * | 2020-06-03 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on segregation evolution law correspondence |
| CN116818468A (en) * | 2023-08-24 | 2023-09-29 | 北京科技大学 | Analysis method for evolution process of molten steel modified by adding rare earth |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3428657A1 (en) * | 1984-08-03 | 1985-06-20 | Fried. Krupp Gmbh, 4300 Essen | Method for preparing a metal sample for a subsequent tensile, creep or relaxation test, and apparatus for applying the method |
| CN2456868Y (en) * | 2000-09-21 | 2001-10-31 | 中国冶金建设集团包头钢铁设计研究总院 | Continuous casting light press down device |
| CN101710086B (en) * | 2009-12-14 | 2012-05-30 | 田陆 | Experimental facility and experimental method for stimulating processes of continuous casting solidification and soft reduction |
| CN201644738U (en) * | 2009-12-14 | 2010-11-24 | 田陆 | Observation model for simulating processes of continuous-casting solidification and soft reduction |
-
2008
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601324A (en) * | 2012-03-14 | 2012-07-25 | 北京科技大学 | High-temperature experimental apparatus and method for research on mechanism of continuous casting soft-reduction |
| CN102601324B (en) * | 2012-03-14 | 2013-07-17 | 北京科技大学 | High-temperature experimental apparatus and method for research on mechanism of continuous casting soft-reduction |
| CN104870121A (en) * | 2013-09-30 | 2015-08-26 | 新日铁住金工程技术株式会社 | Soft reduction method for continuous casting piece |
| CN104772444A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Control method for reducing tail shrinkage hole of square billet |
| CN104772444B (en) * | 2014-01-15 | 2017-06-06 | 宝山钢铁股份有限公司 | Reduce the control method of square billet afterbody shrinkage cavity |
| CN105891437A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Method for evaluating macrosegregation of continuous casting blank |
| CN111679052A (en) * | 2020-06-03 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on segregation evolution law correspondence |
| CN116818468A (en) * | 2023-08-24 | 2023-09-29 | 北京科技大学 | Analysis method for evolution process of molten steel modified by adding rare earth |
| CN116818468B (en) * | 2023-08-24 | 2023-11-10 | 北京科技大学 | Analysis method for evolution process of molten steel modified by adding rare earth |
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| CN101363832B (en) | 2012-05-30 |
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