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Online control method for concentration of emulsion of two-time cold rolling unit

A technology of secondary cold rolling and control method, which is applied in the direction of rolling mill control device, metal rolling, metal rolling, etc., can solve the problem of narrow adjustable range, reduce strip thickness fluctuation, improve rolling stability and The effect of product quality

Active Publication Date: 2020-02-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the secondary cold rolling direct injection system adopts a low-flow and high-concentration emulsion use process, the diameter of the emulsion nozzle hole is small, and the change of the flow rate has a great influence on the injection pressure, so the adjustable range is narrow, so it is not used. Flow-optimized approach to regulating lubrication

Method used

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  • Online control method for concentration of emulsion of two-time cold rolling unit
  • Online control method for concentration of emulsion of two-time cold rolling unit
  • Online control method for concentration of emulsion of two-time cold rolling unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] S1. Collect strip specifications, steel types, front and rear tension, reduction rate, emulsion flow and rolling process parameters; that is, reduction Δh=0.050mm, rolling bite angle α=0.012, strip deformation resistance K= 390MPa, rolling oil dynamic viscosity η 0 =0.023 / Pa·s, pressure viscosity coefficient θ=0.012MPa -1 , strip width B = 0.847m, entrance thickness h 0 =0.200mm, outlet thickness h 1 =0.150mm, post tension stress σ 0 =117MPa, pre-tension stress σ 1 =169MPa, emulsion flow rate Q=9.4L·min -1 , Emulsion separation distance L=0.5m, work roll radius R=162mm, work roll elastic modulus E=210000MPa, work roll Poisson’s ratio ν=0.3, emulsion concentration precipitation efficiency time influence coefficient λ t =487.6, Emulsion concentration and precipitation efficiency Concentration influence system λ w =193.5, emulsion flow, remaining efficiency time influence coefficient δ t =19.25, Emulsion flow residual efficiency flow influence coefficient δ Q =0.49...

Embodiment 2

[0088] S1. Collect the specifications of the strip, steel type, front and rear tension, reduction rate, emulsion flow and rolling process parameters; that is, the reduction Δh=0.040mm, the rolling bite angle α=0.012, and the strip deformation resistance K= 400MPa, rolling oil dynamic viscosity η 0 =0.02 / Pa·s, pressure viscosity coefficient θ=0.01MPa -1 , strip width B = 0.847m, entrance thickness h 0 =0.192mm, outlet thickness h 1 =0.152mm, post tension stress σ 0 =115MPa, pre-tension stress σ 1 =157MPa, emulsion flow rate Q=9.6Lmin -1 , Emulsion separation distance L=0.5m, work roll radius R=170mm, work roll elastic modulus E=210000MPa, work roll Poisson’s ratio ν=0.3, emulsion concentration precipitation efficiency time influence coefficient λ t =478.6、Emulsion concentration and precipitation efficiency Concentration influence system λ w =188.5, Emulsion flow residual efficiency time influence coefficient δ t =21.26, emulsion flow residual efficiency flow influence co...

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Abstract

The invention provides an online control method for the concentration of an emulsion of a two-time cold rolling unit and belongs to the technical field of cold rolling. The aim is to overcome fluctuation of the lubrication performance, rolling pressure and strip steel thickness and the defects of strip steel plate thickness, plate shapes and surface quality in the speed increase and decrease process of the cold rolling unit. The method comprises the steps of S1, collecting a rolling technology parameter of a strip material; S2, collecting a minimum value Cmin and a maximum value Cmax of the concentration of the emulsion of the two-time cold rolling unit; S3, collecting an outlet rolling speed v1 and setting a rolling pressure target value P; S4, calculating an elastic flattening radius Ryof a work roller; S5, calculating a friction coefficient mu of a rolling deformation area; S6, calculating an advancing slip value f of the rolling deformation area; S7, calculating the thickness ksi0of an oil film of an inlet of the rolling deformation area; S8, calculating the thickness ksi2 of an oil film separated from the surface of strip steel; S9, establishing an online control model for the concentration of the emulsion of the two-time cold rolling unit, and calculating the corresponding concentration C of the emulsion; S10, judging whether or not Cmin<=C<=Cmax is established; S11, regulating the concentration C of the emulsion in real time. The concentration of the emulsion in the rolling speed increase and decrease process is online regulated in real time.

Description

technical field [0001] The invention relates to the technical field of cold rolling, in particular to an on-line control method for emulsion concentration of a secondary cold rolling mill. Background technique [0002] The secondary cold rolling is to further reduce the thickness of the strip after the primary cold rolling and annealing, so as to improve the hardness and strength of the material. In the production process of the secondary cold rolling unit, the strip steel is rolled and pressed in the first stand to realize the thickness reduction of the strip steel to meet the thickness requirements of the product, and is flattened in the second stand to realize the shape of the strip steel plate. , Surface roughness control to ensure the final product quality. The steel strip produced by the secondary cold rolling unit has the characteristics of thin gauge and high strength. Therefore, the first stand of the secondary cold rolling unit adopts the direct injection system f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B45/02
CPCB21B37/00B21B45/0239B21B2037/002
Inventor 白振华翟乾俊林威崔熙颖
Owner YANSHAN UNIV
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