Patent ID: 11872614
Assignee: BAOSHAN IRON & STEEL CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An emulsion flow optimization method for suppressing vibration of a cold continuous rolling mill, comprising the following steps:
(S1) collecting device feature parameters of the cold continuous rolling mill, wherein the device feature parameters comprise: a radius Ri of a working roll of each of a plurality of rolling stands, a surface linear velocity vri of a roll of each rolling stand, a original roughness Rair0 of a working roll of each rolling stand, a roughness attenuation coefficient BL of a working roll, a distance l between rolling stands, and a rolling kilometer Li after roll change of a working roll of each rolling stand, wherein i is 1, 2, . . . , n, and represents an ordinal number of the rolling stands of the cold continuous rolling mill, and n is the total number of rolling stands;
(S2) collecting key rolling process parameters of a strip, wherein the key rolling process parameters comprise: an inlet thickness h0i of each rolling stand, an outlet thickness h1i of each rolling stand, a strip width B, an inlet speed v0i of each rolling stand, an outlet speed v1i of each rolling stand, an inlet temperature T1r, a strip deformation resistance Ki of each rolling stand, a rolling pressure Pi of each rolling stand, a back tension T0i of each rolling stand, a front tension T1i of each rolling stand, an emulsion concentration influence coefficient kc, a pressure-viscosity coefficient θ of a lubricant, a strip density ρ, a specific heat capacity S of a strip, an emulsion concentration C, an emulsion temperature Tc and a thermal-work equivalent J;
(S3) defining process parameters involved in an emulsion flow optimization process, wherein the process parameters comprise an over-lubrication film thickness critical value ξi+ of each rolling stand, a first friction coefficient ui+ at this time, an under-lubrication film thickness critical value ξi− and a second friction coefficient ui− at this time, a rolling reduction amount Δhi (wherein Δhi=h0i−h1i), a rolling reduction rate εi (wherein, ε
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(S4) setting an initial set value of an emulsion flow rate comprehensive optimization objective function of the cold continuous rolling mill for achieving a vibration suppression as F0=1.0×1010;
wherein an executing order of steps S1-S4 is not limited;
(S5) calculating a bite angle αi of each rolling stand according to a rolling theory,
wherein a calculation formula is as follows:, α
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(S6) calculating a vibration determination index reference value ξ0i of each rolling stand;
(S7) setting an emulsion flow rate wi of each rolling stand;
(S8) calculating a strip outlet temperature Ti of each rolling stand;
(S9) calculating an emulsion flow rate comprehensive optimization objective function F(X);, {
  
   
    
     
      
       
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(S10) determining whether an in-equation F(X)<F0 is established, if yes, enabling wiy=wi, F0=F(X), and turning to step S11; otherwise, directly turning to step S11;
(S11) determining whether an emulsion flow rate wi exceeds a feasible region range, if yes, turning to step S12, otherwise, turning to step S7, wherein a feasible region of wi ranges from 0 to a maximum emulsion flow rate value allowed by the rolling mill; and
(S12) outputting an optimum emulsion flow rate set value wiy, wherein wiy is the value of wi when a calculated value of F(X) in the feasible region is minimum.