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A method for compensating the flow rate of emulsion on the lower surface of strip steel of dcr unit
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A flow compensation and emulsion technology, applied in the field of cold rolling, can solve the problems of uneven distribution, affecting the surface quality of the strip steel in the secondary cold rolling mill, and prone to strip marks on the surface of the strip steel.
Active Publication Date: 2020-11-13
YANSHAN UNIV
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[0004] According to the above proposal, since the thickness of the oil film on the surface of the strip in the rolling deformation zone is unevenly distributed along the width direction of the strip, the lubrication performance in the rolling deformation zone is unevenly distributed along the width direction of the strip, and the strip surface is prone to appear stripe defects, which affect To solve the technical problems of the surface quality of the steel strip in the secondary cold rolling unit, a compensation method for emulsion flow on the lower surface of the strip steel in the DCR unit is provided
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Embodiment 1
[0052] Taking a secondary cold rolling unit as an example, according to figure 1 The flow chart for calculating the optimal setting value of the emulsion flow on the upper and lower surfaces of the DCR strip is shown, and the specific process is as follows:
[0053] S1. Collect the set target value ξ of the average oil film thickness on the strip steel surface in the rolling deformation zone aveti ={0.214, 0.212, 0.210, 0.213, 0.215, 0.210, 0.213, 0.215, 0.214, 0.212} and the equipment process parameters required for the optimization of the oil film thickness compensation on the lower surface of the strip in the rolling deformation zone, including: the entrance rolling speed V 0 =540m / min, exit rolling speed V 1 =800m / min, roll speed V R =750m / min, bite angle β=0.016rad, initial dynamic viscosity of rolling oil η 0 =0.023pa.s, rolling oil pressure viscosity coefficient γ=0.012Mpa -1 , back tension σ 0 =100Mpa, entrance deformation tension K=350Mpa, surface roughness Ra of...
Embodiment 2
[0070] Taking a secondary cold rolling unit as an example, according to figure 1 The flow chart for calculating the optimal setting value of the emulsion flow on the upper and lower surfaces of the DCR strip is shown, and the specific process is as follows:
[0071] S1. Collect the set target value ξ of the average oil film thickness on the strip steel surface in the rolling deformation zone aveti={0.210, 0.213, 0.211, 0.214, 0.212, 0.215, 0.213, 0.211, 0.210, 0.214} and the equipment process parameters required for the optimization of the oil film thickness compensation on the lower surface of the strip in the rolling deformation zone, including: the entrance rolling speed V 0 =540m / min, exit rolling speed V 1 =800m / min, roll speed V R =750m / min, bite angle β=0.016rad, initial dynamic viscosity of rolling oil η 0 =0.023pa.s, rolling oil pressure viscosity coefficient γ=0.012Mpa -1 , back tension σ 0 =100Mpa, entrance deformation tension K=350Mpa, surface roughness of upp...
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Abstract
The invention provides a DCR unit strip steel lower surface emulsion flow compensation method, and belongs to the technical field of cold rolling. The DCR unit strip steel lower surface emulsion flowcompensation method aims at solving the problems that as the thicknesses of oil films on the surfaces of strip steel in a rolling deformation region are not uniformly distributed in the width direction of the strip steel, the lubricating performance of the rolling deformation region is not uniformly distributed in the width direction of the strip steel, strip-shaped spot defects are easily generated on the surfaces of the strip steel, and the surface quality of the strip steel of a secondary cold rolling unit is affected. The method includes the steps that S1, the set target value of the average oil film thickness of the surfaces of the strip steel in the rolling deformation region and equipment process parameters needed by thickness compensation optimization of the oil film on the lower surface of the strip steel in the rolling deformation region are collected; S2, the thickness of the oil film precipitated on the upper surface of the strip steel in the rolling deformation region andthe thickness of the oil film precipitated on the lower surface of the strip steel are calculated; S3, minimization of the difference between the thicknesses of the oil films on the upper surface andthe lower surface of the strip steel in the rolling deformation region is an objective function G(x); and S4, optimal set values of emulsion flows on the upper surface and the lower surface of the strip steel in the rolling deformation region are determined.
Description
technical field [0001] The invention relates to the technical field of cold rolling, in particular to a method for compensating the flow rate of an emulsion on the lower surface of a steel strip of a DCR unit. Background technique [0002] In recent years, with the increasingly fierce market competition in the steel industry, tin-plated and chrome-plated strip products for cold-rolled packaging continue to develop in the direction of increased strength and thinner thickness. DCR products can meet the mechanical performance requirements of metal packaging products with a thinner thickness, and are conducive to reducing material consumption, reducing the weight of finished products, reducing environmental pollution, and can effectively reduce material consumption and use costs on the premise of ensuring user requirements. Since DCR tin-plated and chrome-plated products are mainly used in the packaging industry, they have high requirements for product aesthetics, safety, and co...
Claims
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