Optimizing method of contact pressure between water cutting rubber and work roll in secondary cold rolling mill

Abstract

Disclosed is an optimizing method of contact pressure for a double cold reduction water shearing rubber and working rollers. The optimizing method of contact pressure for the double cold-rolling watershearing rubber and the working rollers comprises the following steps that 1, main device and rolling technological parameters of a double cold reduction mill are collected; 2, the oil film thicknessof the upper surface of the strip steel at the before-rolling area entrance and the thickness of an oil film adhering to the surface of the upper working roller at the rolling deformation-area outletare calculated; 3, the thickness of an oil film separated out of the lower surface of the strip steel at a before-rolling area is calculated; 4, the required thickness of an oil film adhering to thesurface of the lower working roller at the before-rolling area for enabling the lubricating oil film thicknesses of the upper and lower surfaces of the strip steel to be equal is calculated; 5, the optimal contact pressure of lower water shearing rubber and the lower working roller corresponding to the equal lubricating oil film thickness of the upper and lower surfaces of the strip steel during the rolling process is calculated; and 6, the optimal contact pressure of the lower water shearing rubber and the lower working roller is output. According to the optimizing method of contact pressurefor the double cold reduction mill water shearing rubber and the working rollers, the contact pressure of the upper and lower water shearing rubber and the working rollers can be optimized and determined, the equal lubricating oil film thickness of the upper and lower surfaces of the strip steel during the double cold reduction mill rolling process is achieved, so that the lubricating property ofthe double cold reduction mill and surface quality of products are enhanced.

Description

technical field

[0001] The invention belongs to the technical field of cold rolling, and in particular relates to a method for optimizing the contact pressure between a water cutting rubber and a work roll of a secondary cold rolling mill. Background technique

[0002] Secondary cold rolling refers to the reduction and thinning of the primary cold-rolled steel strip after annealing. Compared with the traditional primary cold rolling, the secondary cold-rolled product has thinner thickness and higher strength. Therefore, the emulsion direct injection system is adopted. Perform rolling lubrication. During the secondary cold rolling process, the nozzle on the emulsion spray rack sprays the emulsion directly on the strip surface at a certain distance from the roll gap, forming an oil film with a certain thickness on the strip surface to lubricate the rolling deformation area, The cooling water spraying device arranged on the exit side of the rolling mill sprays cooling water to...

Examples

Embodiment 1

[0037] Taking a secondary cold rolling unit as an example, according to figure 1 The total calculation flow chart shown:

[0038] First, in step (A), the main equipment and rolling process parameters of the secondary cold rolling unit are collected, including: emulsion flow density q=10.5L / min / m, emulsion flow concentration C=5.8%, emulsion flow density Precipitation distance L=0.5m, rolling speed V at the entrance of the rolling mill 0 =706m / min, work roll speed V R =817m / min, rolling speed V at the exit of the rolling mill 1=882m / min, rolling bite angle α=0.013rad, entrance deformation resistance K 0 =320MPa, back tension σ 0 =95MPa, rolling oil initial dynamic viscosity η 0 =0.025Pa·s, rolling oil pressure viscosity coefficient θ=0.012MPa -1 , Impact coefficient of precipitation rate λ z =0.236, precipitation rate wettability influence coefficient λ r =0.675, precipitation rate time influence coefficient λ t =132.5, influence coefficient δ qs =10.62, the time infl...

Embodiment 2

[0063] Taking a certain secondary cold-rolling unit as an example, at first, in step (A), collect the main equipment and rolling process parameters of the secondary cold-rolling unit, including: emulsion flow density q=14.2L / min / m, emulsification Liquid flow concentration C = 6.6%, emulsion precipitation distance L = 0.5m, rolling mill entrance rolling speed V 0 =555m / min, work roll speed V R =778m / min, rolling speed V at the exit of the rolling mill 1 =836m / min, rolling bite angle α=0.015rad, entrance deformation resistance K 0 =285MPa, back tension σ 0 =101MPa, rolling oil initial dynamic viscosity η 0 =0.025Pa·s, rolling oil pressure viscosity coefficient θ=0.012MPa -1 , Impact coefficient of precipitation rate λ z =0.236, precipitation rate wettability influence coefficient λ r =0.675, precipitation rate time influence coefficient λ t =132.5, influence coefficient δ qs =10.62, the time influence coefficient δ of the remaining rate of the strip upper surface ts =33...

technical field

[0001] The invention belongs to the technical field of cold rolling, and in particular relates to a method for optimizing the contact pressure between a water cutting rubber and a work roll of a secondary cold rolling mill. Background technique

[0002] Secondary cold rolling refers to the reduction and thinning of the primary cold-rolled steel strip after annealing. Compared with the traditional primary cold rolling, the secondary cold-rolled product has thinner thickness and higher strength. Therefore, the emulsion direct injection system is adopted. Perform rolling lubrication. During the secondary cold rolling process, the nozzle on the emulsion spray rack sprays the emulsion directly on the strip surface at a certain distance from the roll gap, forming an oil film with a certain thickness on the strip surface to lubricate the rolling deformation area, The cooling water spraying device arranged on the exit side of the rolling mill sprays cooling water to...

Examples

Embodiment 1

[0037] Taking a secondary cold rolling unit as an example, according to figure 1 The total calculation flow chart shown:

[0038] First, in step (A), the main equipment and rolling process parameters of the secondary cold rolling unit are collected, including: emulsion flow density q=10.5L / min / m, emulsion flow concentration C=5.8%, emulsion flow density Precipitation distance L=0.5m, rolling speed V at the entrance of the rolling mill 0 =706m / min, work roll speed V R =817m / min, rolling speed V at the exit of the rolling mill 1=882m / min, rolling bite angle α=0.013rad, entrance deformation resistance K 0 =320MPa, back tension σ 0 =95MPa, rolling oil initial dynamic viscosity η 0 =0.025Pa·s, rolling oil pressure viscosity coefficient θ=0.012MPa -1 , Impact coefficient of precipitation rate λ z =0.236, precipitation rate wettability influence coefficient λ r =0.675, precipitation rate time influence coefficient λ t =132.5, influence coefficient δ qs =10.62, the time infl...

Embodiment 2

[0063] Taking a certain secondary cold-rolling unit as an example, at first, in step (A), collect the main equipment and rolling process parameters of the secondary cold-rolling unit, including: emulsion flow density q=14.2L / min / m, emulsification Liquid flow concentration C = 6.6%, emulsion precipitation distance L = 0.5m, rolling mill entrance rolling speed V 0 =555m / min, work roll speed V R =778m / min, rolling speed V at the exit of the rolling mill 1 =836m / min, rolling bite angle α=0.015rad, entrance deformation resistance K 0 =285MPa, back tension σ 0 =101MPa, rolling oil initial dynamic viscosity η 0 =0.025Pa·s, rolling oil pressure viscosity coefficient θ=0.012MPa -1 , Impact coefficient of precipitation rate λ z =0.236, precipitation rate wettability influence coefficient λ r =0.675, precipitation rate time influence coefficient λ t =132.5, influence coefficient δ qs =10.62, the time influence coefficient δ of the remaining rate of the strip upper surface ts =33...

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