CN102335729B - Hyperbolic-type crystallizer copper pipe - Google Patents
Hyperbolic-type crystallizer copper pipe Download PDFInfo
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- CN102335729B CN102335729B CN 201110324670 CN201110324670A CN102335729B CN 102335729 B CN102335729 B CN 102335729B CN 201110324670 CN201110324670 CN 201110324670 CN 201110324670 A CN201110324670 A CN 201110324670A CN 102335729 B CN102335729 B CN 102335729B
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Abstract
The invention relates to a hyperbolic-type crystallizer copper pipe, which is characterized in that a conical degree curve of an inner cavity of a crystallizer is a hyperbola; the conical degree curves of four surfaces are all hyperbolas; and a relative large curve gradient is close to a meniscus, so as to better meet the demand on the conical degree close to the meniscus and better adapt to the contraction of a billet shell along the longitudinal direction of the crystallizer, thereby further reducing the thickness of a clearance along the longitudinal direction of the crystallizer, better eliminating the harmful effect of the clearance, promoting a heat transfer effect of the whole crystallizer and meeting the demand on high pulling speed of the crystallizer copper pipe.
Description
Technical field
The present invention relates to the crystallizer copper pipe that metallurgical continuous casting equipment is used, be specifically related to a kind of novel crystallization device copper pipe that adopts the hyperbola taper design.
Background technology
Crystallizer is first cooling device of whole conticaster, and its cooling performance directly affects the quality of strand, is " heart " of conticaster.The physical process that occurs in crystallizer is various, the flowing of molten steel, phase transformation is arranged, solidify the contraction distortion of strand and the heat transfer of variety of way, mass transport process.Molten steel, covering slag, base shell and crystallizer consist of the hot state of a complexity and the Fourier Series expansion technique of mechanical state.
The slab quality problem that occurs in the crystallizer (such as off-square, bulge, corner crack, lobe, surface depression etc.) all with base shell and copper pipe between heat transfer inhomogeneous relevant.The thermal contraction that produces when molten steel solidifies in crystallizer forms air gap between base shell and crystallizer, greatly hindered heat transfer, has reduced cooling effect, makes the attenuation of base shell.Because pulling speed of continuous casting is more and more higher now, the crystallizer cooling effectiveness is required also just higher.Therefore in order to improve cooling condition, between base shell and the crystallizer copper pipe good contact must be arranged, the inner chamber of crystallizer should be the back draught design, to adapt to the solidification shrinkage of base shell, reduces air gap, increases shell thickness.Facts have proved in a large number, adopt the back draught design to process to crystallizer copper pipe and can solve well the slab quality problem that produces in the crystallizer.
Make the requirement of the suitable high pulling rate of crystallizer, must tapering curve reasonable in design.Excessive tapering can cause crystallizer to the extruding of base shell, causes the bight depression, and the friction of base shell and crystallizer increases, and the wearing and tearing of aggravation crystallizer the surface also can occur and increase copper.At folding corner region, because the effect of air gap can form focus, cause on the contrary base shell attenuate and cause crackle.The too little meeting of tapering increases air gap, hot-fluid reduces, base shell attenuate, easily bleed-out occurs; The too small meeting of tapering makes the bight rotate aggravation in addition, brings out subcrack and the vertically generation of depression.Because the inhomogeneities of air gap thickness and the vertical air gap shape of crystallizer is irregular, single tapering crystallizer can not be eliminated the harmful effect of air gap well, and especially when continuous casting low carbon steel or high-speed continuous casting, its deficiency is particularly evident.For this reason, be accompanied by the development of high-speed continuous casting, developed the crystallizer of many taperings such as double tapered, three taperings, four taperings and parabola taper.The longitudinal shape of many taperings crystallizer more meets the actual rule of crystallization base shell, adapted to better the contraction that crystallizer is vertically gone up the base shell, so that the vertical air gap thickness of crystallizer further reduces, eliminated better the harmful effect of air gap, increased the heat-transfer effect of whole crystallizer, for Optimization of Continuous Casting provides assurance.
Such as Chinese utility model patent " 01250557.9 crystallizer copper pipe ".
Summary: crystallizer copper pipe is a kind of accessory for the cast steel conticaster.Molten steel direct pouring is in crystallizer copper pipe, cooling forming is pulled out steel billet continuously in copper pipe, when solving the base shell of the copper pipe course of work and cooling and when contact and the problem of separating, crystallizer copper pipe still is the copper pipe to the square or rectangle of curving, the copper pipe inner chamber from suitable for reading to end opening be taper, the copper pipe inner chamber from suitable for reading to end opening be the bipyramid of tapering segmentation or third hand tap or many cones, perhaps parabolic type cavity shape, the tapering of epimere or upper part is greater than the tapering of hypomere or lower part.The tapering of preferably facing directly is greater than the tapering of cambered surface.Avoid that air gap appears in base shell and copper pipe inwall in the course of work, more meet base shell contraction change rule.
Chinese utility model patent " 200520008088.8 pairs of high pulling-speed crystallizer copper tabes of W type ".
Summary: the present invention relates to the crystallizer copper pipe in the continuous casting steel machine.The inwall vertical section curve of this crystallizer copper pipe is comprised of upper straightway and lower plan parabolic segment, and two line segments are tangent, and has provided the inwall vertical section curvilinear equation of this crystallizer copper pipe, and the vertical section curve of whole crystallizer copper inside pipe wall has continuous back draught.The rate of change of copper pipe cavity shape just can the full remuneration solidified shell shrinkage factor, between solidified shell and copper pipe inwall neither because tapering is not enough air gap (in theory without air gap) appears, do not cause extruding force because tapering is excessive yet.
The longitudinal shape of many taperings crystallizer more meets the actual rule of crystallization base shell, adapted to better the contraction that crystallizer is vertically gone up the base shell, so that the vertical air gap thickness of crystallizer further reduces, eliminated better the harmful effect of air gap, increased the heat-transfer effect of whole crystallizer, for Optimization of Continuous Casting provides assurance.
Near the contraction of molten steel meniscus is larger, changes more violent at this regional tapering.Adopt the parabola taper Curve Design, difficultly at the meniscus place obtain large gradient, thus this patent develop a kind of smooth and method for designing that larger curve gradient is arranged near meniscus, the method is the hyperbola taper design.
Summary of the invention
The purpose of this invention is to provide a kind of Hyperbolic-type crystallizer copper pipe, overcome the shortcoming of parabola taper curve large gradient of difficult acquisition at the meniscus place, adapted to better the contraction that crystallizer is vertically gone up the base shell, so that the vertical air gap thickness of crystallizer further reduces, eliminated better the harmful effect of air gap, increased the heat-transfer effect of whole crystallizer, for Optimization of Continuous Casting provides assurance.
Technical scheme of the present invention is: a kind of Hyperbolic-type crystallizer copper pipe, it is characterized in that: crystallizer internal cavity tapering curve is hyperbola, the tapering curve of four faces is hyperbola, larger curve gradient is arranged near meniscus, described crystallizer copper pipe hyperbola tapering curve meets following tapering curve equation:
Wherein, a, b, c are constant, hereinafter in detail its derivation will be described in detail.M is regulated variable, and the value that changes m can change tapering curve degree of closeness.
At first we suppose that m determines, by the condition that tapering should satisfy in meniscus place and exit, we can determine
,
,
Value.
When
The time:
Wherein
The tapering at expression meniscus place.
When
The time:
Wherein
The effective length of expression crystallizer,
The tapering in expression crystallizer exit.
Add in the exit
:
By [2], [3], [4] simultaneous is tried to achieve:
Beneficial effect:Hyperbolic-type crystallizer copper pipe is with respect to prior art, the effect that has is: because it has larger curve gradient near meniscus, the air gap between crystallizer copper pipe and solidified shell is less, can take away efficiently heat, can improve pulling rate, be convenient to use at the high casting speed continuous casting machine.
Description of drawings
Fig. 1: the crystallizer copper tube cavity width in the embodiment of the invention is along the change curve of copper pipe length direction.
Fig. 2: Hyperbolic-type crystallizer copper pipe structural representation (left cutaway view).
Fig. 3: Hyperbolic-type crystallizer copper pipe structural representation (main cutaway view).
Fig. 4: Hyperbolic-type crystallizer copper pipe structural representation (top view).
The specific embodiment
Description of symbols among the figure: 1, crystallizer copper pipe 2, copper pipe wall 3, hyperbola profile
According to the tapering curve that draws in the summary of the invention, we illustrate the specific embodiment of this invention take certain crystallizer copper pipe as example.Use the conticaster of this crystallizer copper pipe, its major parameter is as follows:
Casting machine type: full arc type
Casting machine radius: 8m
Fluxion: 5 streams
Stream spacing: 1250mm
Casting blank cross-section size: 170mm * 170mm
Crystallizer copper pipe height: 900mm(effective depth 800mm)
Cast steel grade: Q235
Cooling water flow:
The design pulling rate:
If half of the amount of contraction of crystallizer internal cavity is z, tapering curve equation [1] is carried out integration obtain the rule that z changes along the length of mould direction, as shown in the formula expression:
Wherein the detailed derivation of a, b, c provides in summary of the invention.Our hypothesis is 0 in the amount of contraction of strand original position inner chamber, namely
The time
, we obtain thus
According to the parameter of casting machine, we get in this example
,
,
With
, can calculate according to relevant formula:
,
,
With
After the given crystallizer outlet size, this routine given outlet size is: 173.6mm * 173.6mm.Then can determine crystallizer internal cavity width curve according to amount of contraction, as shown in Figure 1, wherein abscissa X (m) is the length coordinate that copper pipe is counted from meniscus; Ordinate W (m) is copper pipe inner chamber width.
Above-described embodiment just is used for the explanation to this patent, and can not be as the restriction to this patent, and every embodiment identical with this patent mentality of designing is all in the protection domain of this patent.
Claims (1)
1. Hyperbolic-type crystallizer copper pipe, it is characterized in that: crystallizer internal cavity tapering curve is hyperbola, and the tapering curve of four faces is hyperbola, and larger curve gradient is arranged near meniscus, described crystallizer copper pipe hyperbola tapering curve meets following tapering curve equation:
A in the formula, b, c have following expression formula:
Wherein
The tapering at expression meniscus place,
The tapering in expression crystallizer exit,
The effective length of expression crystallizer, m is regulated variable, the value that changes m can change tapering curve degree of closeness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110324670 CN102335729B (en) | 2011-10-24 | 2011-10-24 | Hyperbolic-type crystallizer copper pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110324670 CN102335729B (en) | 2011-10-24 | 2011-10-24 | Hyperbolic-type crystallizer copper pipe |
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| CN102335729A CN102335729A (en) | 2012-02-01 |
| CN102335729B true CN102335729B (en) | 2013-01-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106513613B (en) * | 2016-12-27 | 2019-04-16 | 中冶赛迪工程技术股份有限公司 | One kind being based on parabolic path continuous casting crystallizer for plate billet hot width adjusting method online |
| CN110000348B (en) * | 2019-04-03 | 2020-10-02 | 中冶南方连铸技术工程有限责任公司 | Hyperbolic funnel-shaped crystallizer wide-surface copper plate and preparation method thereof |
| CN110000349B (en) * | 2019-04-03 | 2021-01-15 | 中冶南方连铸技术工程有限责任公司 | Sheet billet funnel-shaped crystallizer wide-surface copper plate based on relaxation curve and preparation method thereof |
| CN110523934A (en) * | 2019-10-12 | 2019-12-03 | 北京科技大学 | A kind of combined type can repair the high pulling rate crystallizer of small billet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2696743Y (en) * | 2003-12-26 | 2005-05-04 | 大连大山结晶器股份有限公司 | Electromagnetic stirring copper alloy crystallizer |
| CN202291316U (en) * | 2011-10-24 | 2012-07-04 | 中冶连铸技术工程股份有限公司 | Hyperbolic-type crystallizer copper pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ290001B6 (en) * | 2000-04-28 | 2002-05-15 | Třinecké Železárny A. S. | Circular crystallizer |
| ITMI20052367A1 (en) * | 2005-12-13 | 2007-06-14 | Danieli Off Mecc | crystallizer |
| ITUD20100020A1 (en) * | 2010-02-05 | 2011-08-06 | Danieli Off Mecc | PROCEDURE FOR THE MONITORING OF A CASTING EQUIPMENT |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2696743Y (en) * | 2003-12-26 | 2005-05-04 | 大连大山结晶器股份有限公司 | Electromagnetic stirring copper alloy crystallizer |
| CN202291316U (en) * | 2011-10-24 | 2012-07-04 | 中冶连铸技术工程股份有限公司 | Hyperbolic-type crystallizer copper pipe |
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