CN105537269B - A kind of continuous casting thick stock center hole defect rolls the control method of conjunction - Google Patents
A kind of continuous casting thick stock center hole defect rolls the control method of conjunction Download PDFInfo
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- CN105537269B CN105537269B CN201510932279.1A CN201510932279A CN105537269B CN 105537269 B CN105537269 B CN 105537269B CN 201510932279 A CN201510932279 A CN 201510932279A CN 105537269 B CN105537269 B CN 105537269B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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Abstract
This application discloses the control method that a kind of continuous casting thick stock center hole defect rolls conjunction, including step：(1), setting speed, including setting defect motion containing circular opening license velocity field and rate of strain field；(2) rolling power general power functional, is set up based on velocity field, and tries to achieve minimum rolling power functional；(3) rolling technological parameter, is designed；(4) dynamic critical geometrical form factors, are calculated；(5) the actual geometric configuration factor, is calculated；(6) conjunction state, is rolled to differentiate and adjustment.The present invention rolls conjunction criterion dependent on Dynamic Rolling Process parameter, every time rolling technological parameter can be instructed to formulate, so as to improve product flaw detection qualification rate.
Description
Technical field
The application is related to slab hot rolling technique field, and more particularly to a kind of continuous casting thick stock center hole defect rolls conjunction
Control method.
Background technology
The central area of continuous casting thick stock is inevitably present the metallurgical imperfections such as loose, shrinkage cavity, micro-crack.These defects are broken
The continuity of material is broken, the antifatigue and break resistance of material is reduced, is to cause to roll rear product and detect a flaw not conforming to, restricts into
The main cause that material rate is improved.In many defects, larger hole defect is influenceed seriously to reduce the service life of stocking
Or cause stocking to be scrapped.The conjunction of rolling of strand central defect has to optimizing rolling technological parameter and then improving board quality, lumber recovery
Important meaning.
How effectively to eliminate these central defects in the follow-up operation of rolling is steel industry weight in the urgent need to address
Want problem.
At present, conjunction problem is rolled for central defect, some iron and steel enterprises broadly use the method for improving reduction in pass,
Increase center portion compression stress, promote defect rolls conjunction.Newest research shows, sets up the theory or mould of slab central defect pressing
The mechanics criterion of plan can instruct the design of drafts roughly, and then improve product quality.
For the pressing of central defect, existing analytic criterion and numerical simulation critical condition are because ignoring rolled piece passage not
With and the characteristics of thickness change, every time drafts is designed by identical critical value, i.e., respectively by geometrical form factorsWithIt is designed, belongs to the static cost control of pressure passage, be only capable of providing rough finger
Lead, it is impossible to reflect that the rolling parameter of every time change rolls the influence for closing effect to center hole defect.That particularly simulates faces
Boundary's mechanical condition is only capable of providing discrete point, may be only available for given design parameter, it is difficult to provide generality to produce reality
Guidance.
Therefore, exploitation is of universal significance and can reflect the mechanics criterion of Dynamic Rolling Process parameter influence and provide application process
It is the purpose of the present invention.
The content of the invention
It is existing to overcome it is an object of the invention to provide the control method that a kind of continuous casting thick stock center hole defect rolls conjunction
There is the deficiency in technology.
To achieve the above object, the present invention provides following technical scheme：
The embodiment of the present application discloses the control method that a kind of continuous casting thick stock center hole defect rolls conjunction, including step：
(1), setting speed, including setting defect motion containing circular opening license velocity field and rate of strain field；
(2) rolling power general power functional, is set up based on velocity field, and tries to achieve minimum rolling power functional；
(3) rolling technological parameter, is designed；
(4) dynamic critical geometrical form factors, are calculated, dynamic critical geometrical form factors are：
In formula：hmFor the half of average thickness of slab, Δ h=h0-h1For the half of absolute draft amount,For
Slab half at neutral point is thick, h0For the porch half thickness of rolled piece, h1For rolled piece exit half thickness, R is roller radius, αn
For neutral angle, m is friction factor；
(5) the actual geometric configuration factor, is calculated：
In formula, ht=2hm=h0+h1For the average thickness of whole rolled piece；
(6), roll conjunction state to differentiate with adjusting, if under the actual geometric configuration factor is met with dynamic critical geometrical form factors
Formula (8), then center hole defect roll conjunction：
Otherwise, then adjustment drafts is needed to be met to conjunction discriminate is rolled.
It is preferred that, in above-mentioned continuous casting thick stock center hole defect rolls the control method of conjunction, in the step (1),
The license velocity field of defect motion containing circular opening and rate of strain field are set, is met：
In formula (1), r is circular opening radius, U=vx(hx- r) b=v0(h0- r) b=v1(h1- r) b be second flow volume,
vx、vy、vzFor x in rectangular coordinate system, y, the velocity component in z directions, b is the half of width of plate slab, hxFor the thickness of rolled piece, h 'x
For hxFirst derivative；In formula (2),The normal strain speed along x, y, z direction is represented,Represent shearing strain
Speed, wherein first subscript represents the normal direction of acting surface, second subscript represents the direction of active force, h "xFor hxSecond order
Derivative.
It is preferred that, in above-mentioned continuous casting thick stock center hole defect rolls the control method of conjunction, in the step (2),
Can set up rolling power general power functional based on velocity field is：
In formula：αnFor neutral angle, m is friction factor, σsFor the resistance of deformation of material, h0For the porch half thickness of rolled piece,
h1For rolled piece exit half thickness, R is roller radius；
Rolling power general power functional centering angle αnDerivation, and make it be zero, can obtain friction factor m is：
In formula (4),For contact arc length, the derivative at second flow centering angle
CoefficientCoefficientvRFor roll speed, θ is nip angle；
Friction factor is substituted into general power Functional expression formula, minimum rolling power functional can be obtained, and then substitutes into following formula, can be obtained
Roll torque Mmin, rolling force FminAnd stress status modulus nσRespectively：
It is preferred that, in above-mentioned continuous casting thick stock center hole defect rolls the control method of conjunction, in the step (4),
Make αnNip angle is arrived 0Between scan for, back-pushed-type (4) obtain m, then substitute into successively formula (3),
(5), (6) can determine that numerical value of the dynamic critical geometrical form factors in certain a time.
It is preferred that, in above-mentioned continuous casting thick stock center hole defect rolls the control method of conjunction, in the step (3),
The rolling technological parameter includes roller speed, reduction in pass, rolling temperature.
Compared with prior art, the advantage of the invention is that：The present invention rolls conjunction criterion, energy dependent on Dynamic Rolling Process parameter
Every time rolling technological parameter is enough instructed to formulate, so as to improve product flaw detection qualification rate.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 show the flow that continuous casting thick stock center hole defect in the specific embodiment of the invention rolls the control method of conjunction
Figure；
Fig. 2 show the plate rolling of defect containing center hole deformed area schematic diagram in the specific embodiment of the invention；
Fig. 3 show central defect in the specific embodiment of the invention and rolls conjunction state schematic diagram.
Embodiment
With reference to shown in Fig. 1, the control method that continuous casting thick stock center hole defect rolls conjunction comprises the following steps.
(1) setting speed
According to circular opening in the geometrical feature of rolled piece center, when roller radius is R, the thickness of rolled piece entrance half is h0,
Half thickness is exported for h1, entrance velocity v0, the thickness of deformed area rolled piece half is hx, asynchronous region length is l, and nip angle is θ, as shown in Fig. 2
The following license velocity field of defect motion containing circular opening of setting and rate of strain field：
In formula (1), r is circular opening radius, U=vx(hx- r) b=v0(h0- r) b=v1(h1- r) b be second flow volume,
vx、vy、vzFor x in rectangular coordinate system, y, the velocity component in z directions, b is the half of width of plate slab, hxFor the thickness of rolled piece, h 'x
For hxFirst derivative；In formula (2),The normal strain speed along x, y, z direction is represented,Represent shearing strain
Speed, wherein first subscript represents the normal direction of acting surface, second subscript represents the direction of active force, h "xFor hxSecond order
Derivative.
(2) rolling power and its minimum
Can set up rolling power general power functional based on above-mentioned velocity field is：
In formula：αnFor neutral angle, m is friction factor, σsFor the resistance of deformation of material, h0For the porch half thickness of rolled piece,
h1For rolled piece exit half thickness, R is roller radius.
Rolling power general power functional centering angle αnDerivation, and make it be zero, can obtain friction factor m is：
In formula (4),For contact arc length, the derivative at second flow centering angle
CoefficientCoefficientvRFor roll speed, θ is nip angle；
Friction factor is substituted into general power Functional expression formula, minimum rolling power functional can be obtained, and then substitutes into following formula, can be obtained
Roll torque Mmin, rolling force FminAnd stress status modulus nσRespectively：
The theoretical calculation formula of roll torque and roll-force is design rolling technological parameter and checks milling equipment energy in formula (5)
The foundation of power.
(3) rolling technological parameter is designed
According to mill capacity and product tissue performance requirement, rolling technological parameter is designed, roller speed, passage pressure is specifically included
Amount, rolling temperature.
(4) dynamic critical geometrical form factors are calculated
Stress status modulus seeks extreme value to flaw size in formula (5), can finally obtain dynamic critical geometrical form factors and be：
In formula：hmFor the half of average thickness of slab, Δ h=h0-h1For the half of absolute draft amount,
It is thick for the slab at neutral point half；
According to actual process parameter, α is madenNip angle is arrived 0Between scan for, back-pushed-type
(4) m is obtained, then substitution (3), (5), (6) can determine that numerical value of the dynamic critical geometrical form factors in certain a time successively.
(5) the actual geometric configuration factor is calculated
The actual geometric configuration factor is calculated as follows：
In formula, ht=2hm=h0+h1For the average thickness of whole rolled piece.
(6) conjunction state is rolled to differentiate and adjustment
If the actual geometric configuration factor meets following formula (8), center hole defect with dynamic critical geometrical form factors
Roll conjunction：
Otherwise, then adjustment drafts is needed to be met to conjunction discriminate is rolled.
Below in conjunction with concrete application of the embodiment of the present invention, detailed retouch is carried out to the technical scheme in the embodiment of the present invention
State, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Specific examples below comes from certain domestic factory's heavy plate rolling technological parameter.Roller diameter is 1200mm, rolling temperature
944 DEG C, mill speed 1.64m/s, arm of force coefficient χ=0.49, the original depth 2h of blank0=299mm.It can be counted according to formula (6)
Reduction ratio is calculated in 0.075,0.1,0.125,0.175,0.2 condition lower critical geometrical form factors expression formula concrete numerical value to distinguish
For 0.85319,0.67059,0.55587,0.4791,0.42418,0.38302；Again by formula (7) calculate actual geometric configuration because
Son is 0.39452,0.46368,0.52784,0.58893,0.64812,0.70619.Two groups of data are contrasted, central defect can be obtained
Roll conjunction state such as Fig. 3.
From the figure 3, it may be seen that being 2h for thickness0=299mm slab, its critical compresibility is rc=0.13.In actual production
In, if actual reduction ratio is more than this value, center hole defect can roll conjunction.
The dynamic proposed for checking application rolls conjunction criterion, and this paper's predicts the outcome and existing analysis result, numerical result
Compare.Rolling parameter and data comparison situation are as shown in table 1：
The dynamic of table 1 is rolled conjunction criterion and compared with existing parsing, analog result
| h0/mm | h1/mm | R/mm | Δh | R (%) | Δc | |
| This case dynamic criterion calculated value | 320 | 277.28 | 560 | 42.72 | 13.35 | 0.5302 |
| Numerical simulation | 320 | 275.5 | 560 | 44.5 | 13.9 | 0.53 |
| Existing theoretical value | 320 | 277 | 560 | 43 | 13.4 | 0.518 |
| Actual rolling parameter | 320 | 290.11 | 560 | 29.99 | 9.37 | 0.425 |
From table 1, the conjunction criterion calculated value that rolls of this case is slightly above existing analytic value, is almost overlapped with the analogue value.It is real
Border geometrical factorLess than critical geometrical factorThus need to adjust reduction ratio
It can be met to 13.35% and roll conjunction condition.
When the size of each passage rolled piece changes, it is referred to as above way and carries out drafts design to ensure to roll conjunction bar
The satisfaction of part, so as to finally improve product quality.
Finally, in addition it is also necessary to explanation, term " comprising ", "comprising" or its any other variant are intended to non-exclusive
Property include so that process, method, article or equipment including a series of key elements not only include those key elements, and
Also include other key elements for being not expressly set out, or also include for this process, method, article or equipment inherently
Key element.
Claims (5)
1. a kind of continuous casting thick stock center hole defect rolls the control method of conjunction, it is characterised in that including step：
(1), setting speed, including setting defect motion containing circular opening license velocity field and rate of strain field；
(2) rolling power general power functional, is set up based on velocity field, and tries to achieve minimum rolling power functional；
(3) rolling technological parameter, is designed；
(4) dynamic critical geometrical form factors, are calculated, dynamic critical geometrical form factors are：
In formula：hmFor the half of average thickness of slab, △ h=h0-h1For the half of absolute draft amount,For neutrality
Slab half at point is thick, h0For the porch half thickness of rolled piece, h1For rolled piece exit half thickness, R is roller radius, αnFor in
Property angle, m is friction factor；
(5) the actual geometric configuration factor, is calculated：
In formula, ht=2hm=h0+h1For the average thickness of whole rolled piece,For contact arc length；
(6), roll conjunction state to differentiate with adjusting, if the actual geometric configuration factor meets following formula with dynamic critical geometrical form factors
(8), then center hole defect rolls conjunction：
Otherwise, then adjustment drafts is needed to be met to conjunction discriminate is rolled.
2. continuous casting thick stock center hole defect according to claim 1 rolls the control method of conjunction, it is characterised in that：It is described
In step (1), setting defect motion containing circular opening license velocity field and rate of strain field are met：
In formula (1), r is circular opening radius, U=vx(hx- r) b=v0(h0- r) b=v1(h1- r) b be second flow volume, vx、
vy、vzFor x in rectangular coordinate system, y, the velocity component in z directions, b is the half of width of plate slab, hxFor the thickness of rolled piece, h 'xFor hx
First derivative；In formula (2),The normal strain speed along x, y, z direction is represented,Shearing strain speed is represented,
Wherein first subscript represents the normal direction of acting surface, and second subscript represents the direction of active force, h "xFor hxSecond dervative.
3. continuous casting thick stock center hole defect according to claim 2 rolls the control method of conjunction, it is characterised in that：It is described
In step (2), setting up rolling power general power functional based on velocity field is：
In formula：αnFor neutral angle, m is friction factor, σsFor the resistance of deformation of material, h0For the porch half thickness of rolled piece, h1For
Rolled piece exit half thickness, R is roller radius；
Rolling power general power functional centering angle αnDerivation, and make it be zero, can obtain friction factor m is：
In formula (4),For contact arc length, the derivative at second flow centering angle
CoefficientCoefficientvRFor roll speed, θ is nip angle；
Friction factor is substituted into general power Functional expression formula, minimum rolling power functional φ min can be obtained, and then substitutes into following formula, can
Obtain roll torque Mmin, rolling force FminAnd stress status modulus nσRespectively：
4. continuous casting thick stock center hole defect according to claim 3 rolls the control method of conjunction, it is characterised in that：It is described
In step (4), α is madenNip angle is arrived 0Between scan for, back-pushed-type (4) obtain m, then generation successively
Enter formula (3), (5), (6) and can determine that numerical value of the dynamic critical geometrical form factors in certain a time.
5. continuous casting thick stock center hole defect according to claim 1 rolls the control method of conjunction, it is characterised in that：It is described
In step (3), the rolling technological parameter includes roller speed, reduction in pass, rolling temperature.
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| CN108067501B (en) * | 2017-11-07 | 2019-04-19 | 东北大学 | Operation roll of mill curve design method suitable for bloom and the big pressure of rectangular bloom high temperature |
| CN108817102A (en) * | 2018-06-08 | 2018-11-16 | 苏州大学 | A kind of regulation method of slab central circular defect pressing |
| CN109290540A (en) * | 2018-10-26 | 2019-02-01 | 中冶连铸技术工程有限责任公司 | Continuous small-billet casting casting-rolling technology method and apparatus |
| CN109877168B (en) * | 2019-04-15 | 2020-12-11 | 苏州大学 | Method for establishing rolling force model of extra-thick plate |
| CN111651891B (en) * | 2020-06-05 | 2022-03-11 | 河北工程大学 | Dynamic modeling method for analyzing horizontal self-excited vibration of working roll of hot-rolling finishing mill |
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| JPS5577908A (en) * | 1978-12-11 | 1980-06-12 | Kawasaki Steel Corp | Rolling method for plate |
| JP2002059207A (en) * | 2000-08-16 | 2002-02-26 | Kobe Steel Ltd | Method for rolling thick plate |
| CN101604144B (en) * | 2008-06-13 | 2011-08-31 | 中国科学院金属研究所 | Modeling method of plate rolling in online control model |
| CN103846286B (en) * | 2014-03-01 | 2015-08-26 | 首钢总公司 | A kind of roughing method improving carbon steel wire rod with high core structure |
| CN105032943B (en) * | 2015-07-28 | 2017-05-10 | 攀钢集团攀枝花钢钒有限公司 | Roughly-rolled plate blank tracking control method |
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