CN104785527B - Emulsion direct-injection system spray distance determines method - Google Patents

Emulsion direct-injection system spray distance determines method Download PDF

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Publication number
CN104785527B
CN104785527B CN201410023960.XA CN201410023960A CN104785527B CN 104785527 B CN104785527 B CN 104785527B CN 201410023960 A CN201410023960 A CN 201410023960A CN 104785527 B CN104785527 B CN 104785527B
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unit
oil film
film thickness
representing
emulsion
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CN104785527A (en
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李秀军
董刚
瞿培磊
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention discloses a kind of emulsion direct-injection system spray distance and determine method, its oil film thickness formed when being determined by coefficient of friction to determine belt steel rolling, the maximum oil film thickness formed further according to belt steel surface determine emulsion at belt steel surface can the time of staying, finally according to emulsion at belt steel surface can the time of staying and strip speed, obtain the nozzle distance to milling train center, i.e. emulsion direct-injection system spray distance.

Description

Emulsion direct-injection system spray distance determines method
Technical field
The present invention relates to a kind of emulsion spray control method, particularly relate to the emulsion spray distance side of determination Method.
Background technology
During thin at production specification, precision is high cold-strip steel, including cold rolling or secondary cold-rolling unit, especially It is secondary cold-rolling unit, needs to utilize water oil emulsion direct-injection mode to carry out roll gap lubrication.Wherein emulsion A mixing case is made into the adjustable water yield and oil mass, and is delivered on different spraying rack sprays Being mapped to surface of steel plate, through after a period of time, it can form lubricating oil in strip steel upper and lower surface and rolling zone Film, thus ensure stablizing of the operation of rolling.
During belt steel rolling, emulsion spray system is generally divided into emulsion blood circulation and emulsion Direct-injection system.Wherein, emulsion blood circulation is applied relatively broad under various rolling conditions, such as Fig. 1 Shown in, it be by nozzle C by emulsion spray at roll A or strip steel B surface, thus on the one hand the most right Roll cools down, and is on the other hand lubricated the operation of rolling.And emulsion direct-injection system such as Fig. 2 institute Show, its be by nozzle C by emulsion spray at the strip steel B surface away from roll gap certain distance, through certain Time and form lubricating oil film in uniform thickness at belt steel surface, be characterized in that emulsion is the most direct Discharge, will not recycle.Comparatively speaking, in emulsion direct-injection system, the ESI value of emulsion is higher, Water-oil phase system is relatively stable, it is necessary to could form lubricating oil film at belt steel surface by certain time, But its oil film thickness also can therefore and more stable and uniform, so being particularly suitable for cold rolling middle Surface Quality Require high product.
The feature formed in view of belt steel surface oil film in emulsion direct-injection system, nozzle is to milling train centre-to-centre spacing From determination particularly important.Apart from excessive, peripheral equipment can be polluted by emulsion drippage everywhere, if Standby overall volume also can be the hugest;And if apart from too small, belt steel surface oil film forms required time not Foot, can cause oil film thickness less than normal, and the phenomenon of lack of lubrication occurs in oil film thickness skewness.
The existing method determining that nozzle the most all uses analogy to the method for milling train centre distance, i.e. reference The distance setting value producing relatively stable unit both at home and abroad is designed.The shortcoming using this analogy method Being apparent from, it is poor that the equipment composition of the most each bar unit, product structure, production status etc. exist Not, it is impossible to the reasonability for current design provides safeguard;On the other hand, the unit data referred to is limited, Complete contrast cannot be accomplished.So, when, after equipment actual motion, the direct-injection system of part of generating units can be former Lack of lubrication phenomenon occurs under design discharge, although technical staff can be entered by modes such as enlargement discharges Row makes up, although but blindly flow increase the problem of lack of lubrication of alleviating, but result in emulsion The problem splashed, thus have a strong impact on strip surface quality.Therefore, the most rationally determine that nozzle is to milling train The distance at center, i.e. emulsion direct-injection system spray distance just become the pass improving direct-injection system service behaviour Key.
Summary of the invention
It is an object of the invention to provide a kind of emulsion direct-injection system spray distance and determine method, it can Accurately determine the distance between shower nozzle and milling train center, so that it is guaranteed that the effect of emulsion direct-injection, to obtain The belt steel product that surface quality is high.
To achieve these goals, the present invention proposes a kind of emulsion direct-injection system spray distance side of determination Method, it comprises the following steps:
(1) milling train under the conditions of sufficient lubrication and the coefficientoffrictionμ between strip steel are determinedj:
μ j = Q F j - 1.08 - 1.08 + 1.02 r j 1.79 r j 1 - r j · R ′ j h 1 j
Q F j = P j ( K m j - ξ j ) · B j · R ′ j Δh j - 2 3 1 - v j 2 E j K m j h 1 j Δh j ;
Wherein: rjRepresent frame reduction ratio,h1jRepresenting exit thickness, unit is mm; h0jRepresenting inlet thickness, unit is mm;R′jRepresenting that working roll flattens radius, unit is mm;PjTable Showing roll-force, unit is KN;KmjRepresenting passage average deformation drag, unit is MPa;ξjRepresent Effect tension force affects coefficient, ξj=0.3 σ1j+0.7σ0j, σ1jFor front tensile stress, unit is MPa, σ0jFor rear Tensile stress, unit is MPa;BjRepresenting strip width, unit is mm;ΔhjRepresent passage absolute draft Amount, Δ hj=h0j-h1j;vjRepresent Poisson's ratio;EjRepresent strip steel elastic modelling quantity;QFjRepresent and calculated Middle parameter in journey;
(2) oil film thickness λ during belt steel rolling under current working is determinedj:
λ j = 1 a 1 l n μ j - a 2 a 3
Wherein, a1、a2、a3For model coefficient, a1=-3.0100, a2=0.0126, a3=0.1416;
(3) by oil film thickness λjWith maximum oil required in the machine set product operation of rolling of an initial setting up Film thickness λmaxCompare, take bigger in the two one as final maximum oil film thickness λmax';
(4) the maximum oil film thickness λ that unit reality can reach is determined0:
λ0=η λmax'
Wherein, η=1.0~1.3;
(5) the maximum oil film thickness λ that unit reality can reach is determined0Critical formation time t:
t = λ 0 - b 1 b 2
Wherein, b1、b2For model coefficient, b1=0.1766, b2=4.4595;
(6) nozzle distance s to milling train center is determined*:
s * = v ‾ · t
Wherein,Representing the average mill speed of milling train, unit is m/s.
Inventor is found by research, cause the reason of lack of lubrication should be nozzle to milling train center away from From too small, emulsion is under normal discharge, and the emulsion of belt steel surface can not form foot in finite time The oil film of enough thickness, and distribution is the most uneven.And the oil film that formed the when of enlargement discharge is ideal, But emulsion drippage, splashing are seriously.It addition, inventor also finds, in cold-rolled process, at roll gap Oil film thickness and coefficient of friction have certain functional relationship, therefore can be determined by coefficient of friction to institute The oil film thickness formed calculates.Additionally, form machine according to belt steel surface lubricating oil film in direct-injection system Reason, the oil film thickness that the belt steel surface of high-speed motion is formed and emulsion are in the stopped time of belt steel surface Between approximate linear, therefore by this time and strip speed, nozzle can be obtained to milling train The distance at center.
Emulsion direct-injection system of the present invention spray distance determines method, can determine rapidly and accurately Distance between shower nozzle and milling train center, so that it is guaranteed that the effect of emulsion direct-injection, to obtain surface quality High belt steel product.
Accompanying drawing explanation
Fig. 1 is the injection schematic diagram of emulsion blood circulation.
Fig. 2 is the injection schematic diagram of emulsion direct-injection system.
Fig. 3 is that emulsion direct-injection system of the present invention spray distance determines that method is at a kind of embodiment Under steps flow chart schematic diagram.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment to emulsion direct-injection system of the present invention Spray distance determines that method makes further explanation, but, it is right that this explanation and explanation are not intended that The improper restriction of the technical program.
As it is shown on figure 3, according to the following step determine emulsion direct-injection system spray distance:
(0) start;
(1) product of all m kind specifications that collection unit produces each technique under the conditions of sufficient lubrication Parameter:
Average mill speed;PjRoll-force;KmjPassage average deformation drag;ξj-equivalence Power affects coefficient, ξj=0.3 σ1j+0.7σ0j, σ1jFront tensile stress, σ0jRear tensile stress;BjStrip steel Width;R′jWorking roll flattens radius;ΔhjPassage absolute draft amount, Δ hj=h0j-h1j, h0jEnter Mouth thickness, h1jExit thickness;rjFrame reduction ratio,EjStrip steel elastic modelling quantity; vjPoisson's ratio;M=18, j=1,2 ..., m;
(2) the maximum oil film thickness λ needing to reach in this machine set product operation of rolling is mademax=0, unit is real The maximum oil film thickness λ that border can reach0=0;
(3) order characterizes the process variable j=1 of product specification;
(4) judging whether inequality j≤m sets up, if setting up, then proceeding to step (5);Otherwise, turn Enter step (8);
(5) milling train under the conditions of sufficient lubrication and the coefficientoffrictionμ between strip steel are calculatedj, computing formula is:
μ j = Q F j - 1.08 - 1.08 + 1.02 r j 1.79 r j 1 - r j · R ′ j h 1 j
Q F j = P j ( K m j - ξ j ) · B j · R ′ j Δh j - 2 3 1 - v j 2 E j K m j h 1 j Δh j
(6) oil film thickness during rolling of jth kind specification strip steel under current working is calculated:
λ j = 1 a 1 l n μ j - a 2 a 3
Model coefficient a1=-3.0100, a2=0.0126, a3=0.1416;
(7) inequality λ is judgedj> λmaxWhether setting up, if setting up, then making λmaxj, j=j+1, turn Enter step (4), otherwise make j=j+1, proceed to step (4);
(8) the maximum oil film thickness λ that unit reality can reach is calculated0:
λ0=η λmax
Wherein safety coefficient η=1.10;(λ hereinmaxI.e. λ in its claimmax', i.e. determine final Big oil film thickness)
(9) the critical formation time t of calculating maximum oil film thickness:
t = λ 0 - b 1 b 2
Model coefficient b1=0.1766, b2=4.4595;
(10) nozzle optimum distance s to milling train center is calculated*,
(11) terminate.
It should be noted that the listed above specific embodiment being only the present invention, it is clear that the invention is not restricted to Above example, has the similar change of many therewith.If those skilled in the art is public from the present invention All deformation that the content opened directly derives or associates, all should belong to protection scope of the present invention.

Claims (1)

1. an emulsion direct-injection system spray distance determines method, it is characterised in that comprise the following steps:
(1) milling train under the conditions of sufficient lubrication and the coefficientoffrictionμ between strip steel are determinedj:
μ j = Q F j - 1.08 + 1.02 r j 1.79 r j 1 - r j · R ′ j h 1 j
Q F j = P j ( K m j - ξ j ) · B j · R ′ j Δh j - 2 3 1 - v j 2 E j K m j h 1 j Δh j ;
Wherein: rjRepresent frame reduction ratio,h1jRepresenting exit thickness, unit is mm;h0jRepresenting inlet thickness, unit is mm;R′jRepresenting that working roll flattens radius, unit is mm;PjRepresenting roll-force, unit is KN;KmjRepresenting passage average deformation drag, unit is MPa;ξjRepresent that equivalence tension force affects coefficient, ξj=0.3 σ1j+0.7σ0j, σ1jFor front tensile stress, list Position is MPa, σ0jFor rear tensile stress, unit is MPa;BjRepresenting strip width, unit is mm; ΔhjRepresent passage absolute draft amount, Δ hj=h0j-h1j;vjRepresent Poisson's ratio;EjRepresent band steel bomb Property modulus;QFjRepresent the middle parameter during calculating;
(2) oil film thickness λ during belt steel rolling under current working is determinedj:
λ j = 1 a 1 l n μ j - a 2 a 3
Wherein, a1、a2、a3For model coefficient, a1=-3.0100, a2=0.0126, a3=0.1416;
(3) by oil film thickness λjWith the machine set product operation of rolling of an initial setting up required Big oil film thickness λmaxCompare, take bigger in the two one as final maximum oil film thickness λmax';
(4) the maximum oil film thickness λ that unit reality can reach is determined0:
λ0=η λmax'
Wherein, η=1.0~1.3;
(5) the maximum oil film thickness λ that unit reality can reach is determined0Critical formation time t:
t = λ 0 - b 1 b 2
Wherein, b1、b2For model coefficient, b1=0.1766, b2=4.4595;
(6) nozzle distance s to milling train center is determined*:
s * = v ‾ · t
Wherein,Representing the average mill speed of milling train, unit is m/s.
CN201410023960.XA 2014-01-20 2014-01-20 Emulsion direct-injection system spray distance determines method Active CN104785527B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106955891B (en) * 2016-01-08 2018-07-06 宝山钢铁股份有限公司 The working roll for being suitable for tandem mills matches roller method
CN107766606B (en) * 2017-09-01 2020-03-31 燕山大学 Method for improving lubricating property of emulsion process of direct injection system of secondary cold rolling unit
CN109550790B (en) * 2017-09-27 2020-06-23 宝山钢铁股份有限公司 Emulsion spraying control method and spraying device of secondary cold rolling unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054172A2 (en) * 1980-12-12 1982-06-23 Sms Schloemann-Siemag Aktiengesellschaft Method of and arrangement for rolling stress-free strip
JP2001321809A (en) * 2000-05-19 2001-11-20 Nkk Corp Method for cold-rolling steel strip
CN2882835Y (en) * 2006-02-24 2007-03-28 武汉钢铁(集团)公司 Novel emulsion purifier for rolling
CN201613263U (en) * 2010-01-06 2010-10-27 曾庆荣 Device for filling rolling oil to cold rolling mill
CN102189126A (en) * 2010-03-12 2011-09-21 宝山钢铁股份有限公司 Injection device and method for uniformly lubricating roll gap of rolling mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054172A2 (en) * 1980-12-12 1982-06-23 Sms Schloemann-Siemag Aktiengesellschaft Method of and arrangement for rolling stress-free strip
JP2001321809A (en) * 2000-05-19 2001-11-20 Nkk Corp Method for cold-rolling steel strip
CN2882835Y (en) * 2006-02-24 2007-03-28 武汉钢铁(集团)公司 Novel emulsion purifier for rolling
CN201613263U (en) * 2010-01-06 2010-10-27 曾庆荣 Device for filling rolling oil to cold rolling mill
CN102189126A (en) * 2010-03-12 2011-09-21 宝山钢铁股份有限公司 Injection device and method for uniformly lubricating roll gap of rolling mill

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