CN108480403A - Technological lubrication parameter optimization setting method under the conditions of secondary cold-rolling unit small deformation - Google Patents

Technological lubrication parameter optimization setting method under the conditions of secondary cold-rolling unit small deformation Download PDF

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CN108480403A
CN108480403A CN201810275209.7A CN201810275209A CN108480403A CN 108480403 A CN108480403 A CN 108480403A CN 201810275209 A CN201810275209 A CN 201810275209A CN 108480403 A CN108480403 A CN 108480403A
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parameter
rolling
transferred
inequality
concentration
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CN108480403B (en
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白振华
刘超智
钱承
刘亚星
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Yanshan University
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Yanshan University
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Abstract

The invention discloses technological lubrication parameter optimization setting methods under the conditions of a kind of secondary cold-rolling unit small deformation, fully take into account the equipment and technology feature of tandem mills, using ensure strip do not occur to skid and Jumping phenomenons are as control targe, in the case where emulsion quality, rolling technological parameter (steel grade, specification, reduction ratio, mill speed, front and back tension), roller technology parameter (working roll roller diameter, initial surface roughness) determine, seek optimum emulsification liquid concentration, optimum flow, optimal initial temperature.To improve the production stability of unit, benefit is brought for enterprise.

Description

Technological lubrication parameter optimization setting method under the conditions of secondary cold-rolling unit small deformation
Technical field
The present invention relates to the technological lubrication parameters under the conditions of cold rolling field more particularly to a kind of secondary cold-rolling unit small deformation Optimal setting method.
Background technology
In secondary cold-rolling production process, in order to reduce surface temperature, the Reducing distortion area contact arc table of roll and band Friction factor and frictional force on face prevent metal to be sticked to roller surface while reducing the abrasion of roll, need to roll and band It sprays emulsion and carries out technological lubrication in surface.The quality of technological lubrication will directly influence the matter of the stability and product of rolling Amount.Secondary cold-rolling unit deformation of strip amount hour, advancing slip value and draught pressure are all smaller, and advancing slip value is smaller to cause band to occur Slipping phenomenon, roll-force is smaller to cause rolling stress smaller, thus be possible to reach the yield strength of secondary cold-rolling band from And occurring Jumping phenomenons during the rolling process, this has seriously affected the rolling stability of unit.
In cold rolling field, there is not pertinent literature to be related to tandem mills in terms of process parameter optimizing before ensureing strip Sliding value and draught pressure reduce the incidence of strip wild effect under the premise of allowable range, and the optimization of the present invention is arranged It applies, improves unit to production stability, benefit is brought for manufacturing enterprise.
Invention content
Under the conditions of present invention aims at a kind of raising units of offer to the secondary cold-rolling unit small deformation of production stability Technological lubrication parameter optimization setting method.
To achieve the above object, following technical scheme is used：The method of the present invention includes the following steps：
Step a collects the capital equipment and technological parameter of secondary cold-rolling unit；
Step b defines concentration of emulsion used c, flow w, initial temperature t0, optimum emulsification liquid concentration cy, optimum flow wy, most Good initial temperature t0y, definition Controlling object function is G3(Z), concentration of emulsion used setting step delta c, flow set step delta are given W, initial temperature Δ t0, setting object function initial value G0=0；
Step c, initialization concentration of emulsion used pilot process parameter kc'=0；
Step d calculates concentration of emulsion used c=cmin+kc'Δc；
Step e, initialization emulsification flow quantity pilot process parameter kw=0；
Step f calculates emulsification flow quantity w=wmin+kwΔw；
Step g, initialization emulsion initial temperature pilot process parameter kt=0；
Step h calculates emulsion initial temperature t0=t0min+ktΔt0；
Step i calculates friction coefficient μ under current working；
In formula, a, which is fluid friction, influences coefficient；B, which is dry friction, influences coefficient；BξFor friction coefficient damped expoential；ξ01For Dynamic oil film thickness when smooth roll rolls, andξ02Be gloss level of roll to profit Lubricating oil film thickness influence amount depends on the practical roughness of roll；
Step j calculates draught pressure P, unit rolling stress p, slip factor ψ under current working, draught pressure
In formula：pη1For intensity tension specification coefficientpη2For dimensional strength coefficientpη3For specification coefficient of draughtR ' is that working roll flattens half DiameterUnit rolling stress p=P/ (Bl)；Slip factorWherein T1For forward pull, T0For backward pull；
Step k calculates Controlling object function F3(Z), computation model is
β is small deformation amount judge index weighting coefficient；kσThe floating of stress and yield strength relationship occurs for jumping phenomenons Dynamic coefficient, kσ=1.20~1.34；
Judge inequalityIt is whether true, if set up, enable F0=F3, enable optimum emulsification liquid dense Spend cy=c, optimum emulsification flow quantity wy=w, optimum emulsification liquid initial temperature t0y=t0, it is transferred to step m；If invalid, directly It is transferred to step m；
Step m judges inequality t0＜ t0maxIt is whether true, if inequality is set up, enable kt=kt+ 1, it is transferred to step h；If invalid, it is transferred to step n；
Step n judges inequality w ＜ wmaxIt is whether true, if inequality is set up, enable kw=kw+ 1, it is transferred to step f； If invalid, it is transferred to step o；
Step o judges inequality c ＜ cmaxIt is whether true, if inequality is set up, enable kc'=kc'+ 1, it is transferred to step d；If invalid, it is transferred to step p；
Step p exports optimum emulsification liquid concentration cy, optimum flow wy, optimal initial temperature t0y。
Further, in step a, the equipment and technology parameter step for collecting secondary cold-rolling unit is as follows：
A1 collects the roller technology parameter of cold mill complex；Including：Work roll diameter D, initial surface roughness Rar0, work The elastic modulus E of roller, the Poisson's ratio ν of working roll；
A2 collects secondary cold-rolling unit correlation rolling technological parameter；Including：The average deformation drag K of bandmIt is strong with surrender Spend σs, the width B of band, supplied materials thickness h0, reduction ratio ε, normal mill speed V, draught pressure setting value P, forward pull T1、 Backward pull T0, front and back tensile stress σ1、σ0；
A3, collection process lubricating regime parameter；Including：Dynamic viscosity η, the compressed coefficient θ of emulsion；
A4 collects the technology characteristics parameter of cold mill complex；Including：Maximum draught pressure P* allowable, value that critical maximum is advancing slip ψ *, minimum, maximum concentration of emulsion used c allowablemin、cmax, minimum, maximum emulsification flow quantity w allowablemin、wmax, allowable minimum, most Big emulsion initial temperature t0min、t0max。
The course of work approximately as：
In order to more effectively ensure the stability of belt steel rolling, established in the judge index of small deformation amount stable rolling ability On the basis of, under the premise of not occurring to skid with Jumping phenomenons, farthest reduce belt steel rolling not in guarantee strip The probability of happening of stabilization, this just needs optimization process to meet following two conditions：(1) slip factor is required under small deformation amount With unitstress under the premise of tolerance band, optimize emulsion technique towards the direction for improving roll-force and reduction slip factor Parameter reduces the probability of happening that wild effect is rolled under light reduction to reach；(2) clear principle is illustrated, calculating speed Soon.For a specific operation of rolling, in emulsion quality, rolling technological parameter (steel grade, specification, reduction ratio, rolling Speed, front and back tension), roller technology parameter (working roll roller diameter, initial surface roughness) determine in the case of, in conjunction with rolling press Power model and forward slip model obtain object function F under the premise of ensureing strip stable rolling by optimizing3(Z) value is most The figure of merit realizes the target of emulsion process parameter optimizing.Entire optimization process can be simply described as：Find one properly Z={ c, w, t0So that the F in the case where meeting constraints3(Z) maximum.
Compared with prior art, the invention has the advantages that：It realizes tandem mills and is ensureing not occurring for strip Under the premise of skidding with Jumping phenomenons, the probability of happening of belt steel rolling wild effect, reasonable employment are farthest reduced Emulsion has given full play to emulsion cooling capacity, while having made each rack emulsion cooling capacity more uniform, improves life The stability of production brings benefit for manufacturing enterprise.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
As shown in Figure 1, the step of the method for the present invention, is as follows：
(a) capital equipment and technological parameter for collecting secondary cold-rolling unit, mainly include the following steps that：
A1) collect cold mill complex roller technology parameter, include mainly：Work roll diameter D=450mm, initial surface are thick Elastic modulus E=the 210GPa of Ra=0.85 μm of working roll of rugosity, Poisson's ratio ν=0.27 of working roll；
A2 secondary cold-rolling unit correlation rolling technological parameter) is collected, includes mainly：The average deformation drag K of bandm= 475MPa and yield strength σsThe thickness H of=500MPa, the width B=966mm of band, supplied materialsi=0.275mm reduction ratios ε= 8.3%, normal mill speed V=230m/min, draught pressure setting value P=372t, forward pull T1=120MPa, backward pull T0 =160MPa, front and back tensile stress σ1=7.2MPa, σ0=8.1MPa；
A3) collection process lubricating regime parameter, main includes dynamic viscosity η=0.023pas, the compression system of emulsion Number θ=0.01/MPa；
A4) collect cold mill complex technology characteristics parameter, include mainly：Maximum draught pressure P*=1800t allowable, it is critical Maximum *=6 advancing slip value ψ, minimum, maximum concentration of emulsion used c allowablemin=0.8%, cmax=5.6%, minimum, maximum breast allowable Change flow quantity wmin=700L/min, wmax=1650L/min, minimum, maximum emulsion initial temperature t allowable0min=50 DEG C, t0max=65 DEG C；
(b) concentration of emulsion used c=2%, flow w=950L/min, initial temperature t are defined0=53 DEG C, optimum emulsification liquid is dense Spend cy, optimum flow wy, optimal initial temperature t0y, definition Controlling object function is G3(Z), it gives concentration of emulsion used and sets step-length Δ c=0.48%, flow set step delta w=95L/min, initial temperature step delta t0=1.5 DEG C, setting object function is initial Value G0=0；
(c) initialization concentration of emulsion used pilot process parameter kc'=0；
(d) concentration of emulsion used c=c is calculatedmin+kc'Δc；
(e) initialization emulsification flow quantity pilot process parameter kw=0；
(f) emulsification flow quantity w=w is calculatedmin+kwΔw；
(g) initialization emulsion initial temperature pilot process parameter kt=0；
(h) emulsion initial temperature t is calculated0=t0min+ktΔt0；
(i) friction coefficient u=0.059 under current working is calculated；
(j) draught pressure P=3630.777KN, unit rolling stress p=13667.52MPa under current working are calculated, is beaten Sliding factor ψ=0.020；
(k) Controlling object function F is calculated3(Z), computation model is
β=0.3 is taken to obtain F3(Z)=0.616；
(l) inequalityIt sets up, therefore enables F0=F3, enable optimum emulsification liquid concentration cy=c, best breast Change flow quantity wy=w, optimum emulsification liquid initial temperature t0y=t0, it is transferred to step (m)；
(m) judge inequality t0＜ t0maxIt is whether true, if inequality is set up, then enable kt=kt+ 1, it is transferred to step (h), it is no Then, directly it is transferred to step (n)；
(n) judge inequality w ＜ wmaxIt is whether true, if inequality is set up, then enable kw=kw+ 1, it is transferred to step (f), it is no Then, directly it is transferred to step (o)；
(o) judge inequality c ＜ cmaxIt is whether true, if inequality is set up, then enable kc'=kc'+ 1, it is transferred to step (d), it is no Then, directly it is transferred to step (p)；
(p) it is recycled successively according to step, finally exports optimum emulsification liquid concentration cy=2.3%, optimum flow wy=1260L/ Min, optimal initial temperature t0y=58 DEG C.
Embodiment 2
(a) capital equipment and technological parameter for collecting secondary cold-rolling unit, mainly include the following steps that：
A1) collect cold mill complex roller technology parameter, include mainly：Working roll D=450mm initial surface roughness Ras Elastic modulus E=210GPa of=0.92 μm of working roll, Poisson's ratio ν=0.27 of working roll；
A2 secondary cold-rolling unit correlation rolling technological parameter) is collected, includes mainly：The average deformation drag K of bandm= 475MPa and yield strength σsThe thickness h of=500MPa, the width B=966mm of band, supplied materials0=0.275mm, reduction ratio ε= 5%, normal mill speed V=230m/min, draught pressure setting value P=372t, forward pull T1=140MPa, backward pull T0= 100MPa, front and back tensile stress σ1=12.5MPa, σ0=7.5MPa；
A3) collection process lubricating regime parameter, main includes dynamic viscosity η=0.023pas, the compression system of emulsion Number θ=0.01/MPa；
A4) collect cold mill complex technology characteristics parameter, include mainly：Maximum draught pressure P*=1800t allowable, it is critical Maximum *=6 advancing slip value ψ, minimum, maximum concentration of emulsion used c allowablemin=0.8%, cmax=5.6%, minimum, maximum breast allowable Change flow quantity wmin=700L/min, wmax=1650L/min, minimum, maximum emulsion initial temperature t allowable0min=50 DEG C, t0max=65 DEG C；
(b) concentration of emulsion used c=0.8%, flow w=700L/min, initial temperature t are defined0=50 DEG C；Optimum emulsification liquid Concentration cy, optimum flow wy, optimal initial temperature t0y, definition Controlling object function is G3(Z), concentration of emulsion used setting step is given Long Δ c=0.48%, flow set step delta w=95L/min, temperature setting step delta t0=1.5 DEG C, at the beginning of setting object function Initial value G0=0；
(c) initialization concentration of emulsion used pilot process parameter kc'=0；
(d) concentration of emulsion used c=c is calculatedmin+kc'Δc；
(e) initialization emulsification flow quantity pilot process parameter kw=0；
(f) emulsification flow quantity w=w is calculatedmin+kwΔw；
(g) initialization emulsion initial temperature pilot process parameter kt=0；
(h) emulsion initial temperature t is calculated0=t0min+ktΔt0；
(i) friction coefficient μ=0.065 under current working is calculated；
(j) it calculates draught pressure P=3376.887KN under current working, unit rolling stress p=12711.289MPa, beat Sliding factor ψ=0.031；
(k) Controlling object function F is calculated3(Z), computation model is
β=0.4 is taken to obtain F3(Z)=1.216；
(l) inequalityIt sets up, therefore enables F0=F3, enable optimum emulsification liquid concentration cy=c, best breast Change flow quantity wy=w, optimum emulsification liquid initial temperature t0y=t0, it is transferred to step (m)；
(m) judge inequality t0＜ t0maxIt is whether true, if inequality is set up, then enable kt=kt+ 1, it is transferred to step (h), it is no Then, directly it is transferred to step (n)；
(n) judge inequality w ＜ wmaxIt is whether true, if inequality is set up, then enable kw=kw+ 1, it is transferred to step (f), it is no Then, directly it is transferred to step (o)；
(o) judge inequality c ＜ cmaxIt is whether true, if inequality is set up, then enable kc'=kc'+ 1, it is transferred to step (d), it is no Then, directly it is transferred to step (p)；
(p) according to above-mentioned steps cycle calculations, optimum emulsification liquid concentration c is exportedy=2.1%, optimum flow wy=750L/ Min, optimal initial temperature t0y=58 DEG C.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the scope of the present invention It is defined, under the premise of not departing from design spirit of the present invention, those of ordinary skill in the art are to technical scheme of the present invention The various modifications made and improvement should all be fallen into the protection domain of claims of the present invention determination.

Claims (2)

1. technological lubrication parameter optimization setting method under the conditions of a kind of secondary cold-rolling unit small deformation, which is characterized in that the side Method includes the following steps：
Step a collects the capital equipment and technological parameter of secondary cold-rolling unit；
Step b defines concentration of emulsion used c, flow w, initial temperature t0, optimum emulsification liquid concentration cy, optimum flow wy, it is best just Beginning temperature t0y, definition Controlling object function is G3(Z), concentration of emulsion used setting step delta c, flow set step delta w, just are given Beginning temperature Δ t0, setting object function initial value G0=0；
Step c, initialization concentration of emulsion used pilot process parameter kc'=0；
Step d calculates concentration of emulsion used c=cmin+kc'Δc；
Step e, initialization emulsification flow quantity pilot process parameter kw=0；
Step f calculates emulsification flow quantity w=wmin+kwΔw；
Step g, initialization emulsion initial temperature pilot process parameter kt=0；
Step h calculates emulsion initial temperature t0=t0min+ktΔt0；
Step i calculates friction coefficient μ under current working；
In formula, a, which is fluid friction, influences coefficient；B, which is dry friction, influences coefficient；BξFor friction coefficient damped expoential；ξ01For smooth roll Dynamic oil film thickness when rolling, andξ02It is gloss level of roll to lubricating oil Film thickness influence amount depends on the practical roughness of roll；
Step j calculates draught pressure P, unit rolling stress p, slip factor ψ under current working, draught pressure
In formula：For intensity tension specification coefficient For dimensional strength coefficient For specification coefficient of draughtR ' is that working roll flattens half DiameterRolling stress p=P/ (Bl)；Slip factorWherein T1For forward pull, T0For backward pull；
Step k calculates Controlling object function F3(Z), computation model is
β is small deformation amount judge index weighting coefficient；kσThe floating system of stress and yield strength relationship occurs for jumping phenomenons Number；
Judge inequalityIt is whether true, if set up, enable F0=F3, enable optimum emulsification liquid concentration cy =c, optimum emulsification flow quantity wy=w, optimum emulsification liquid initial temperature t0y=t0, it is transferred to step m；If invalid, directly turn Enter step m；
Step m judges inequality t0＜ t0maxIt is whether true, if inequality is set up, enable kt=kt+ 1, it is transferred to step h；If It is invalid, it is transferred to step n；
Step n judges inequality w ＜ wmaxIt is whether true, if inequality is set up, enable kw=kw+ 1, it is transferred to step f；If It is invalid, it is transferred to step o；
Step o judges inequality c ＜ cmaxIt is whether true, if inequality is set up, enable kc'=kc'+ 1, it is transferred to step d；If It is invalid, it is transferred to step p；
Step p exports optimum emulsification liquid concentration cy, optimum flow wy, optimal initial temperature t0y。
2. technological lubrication parameter optimization setting method under the conditions of secondary cold-rolling unit small deformation according to claim 1, It is characterized in that, in step a, the equipment and technology parameter step for collecting secondary cold-rolling unit is as follows：
A1 collects the roller technology parameter of cold mill complex；Including：Work roll diameter D, initial surface roughness Rar0, working roll The Poisson's ratio ν of elastic modulus E, working roll；
A2 collects secondary cold-rolling unit correlation rolling technological parameter；Including：The average deformation drag K of bandmWith yield strength σs、 The width B of band, the thickness h of supplied materials0, reduction ratio ε, normal mill speed V, draught pressure setting value P, forward pull T1, backward pull T0, front and back tensile stress σ1、σ0；
A3, collection process lubricating regime parameter；Including：Dynamic viscosity η, the compressed coefficient θ of emulsion；
A4 collects the technology characteristics parameter of cold mill complex；Including：Maximum draught pressure P* allowable, critical maximum is advancing slip value ψ *, perhaps With minimum, maximum concentration of emulsion used cmin、cmax, minimum, maximum emulsification flow quantity w allowablemin、wmax, minimum, maximum emulsification allowable Liquid initial temperature t0min、t0max。
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CN106552828A (en) * 2015-09-30 2017-04-05 宝山钢铁股份有限公司 The manufacture method of the nozzle and the nozzle of secondary cold-rolling unit spray system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110961464A (en) * 2018-09-29 2020-04-07 宝山钢铁股份有限公司 Emulsion concentration optimization method of cold continuous rolling unit with vibration suppression as target
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