Roll pass optimizing method capable prolonging shaped roll service life
A technology of pass optimization and rolling, applied in the direction of rolling, metal rolling, metal rolling, etc., to achieve the effect of improving unevenness, reducing uneven wear, and changing the wear state
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Embodiment 1
[0044] Example 1 Taking the optimization of the roll pass of a 60kg / mU75V rail roughing mill as an example
[0045] (1) Model and calculate the rolling process under the target rolling process
[0046] Firstly, the rolling process prediction model is established, and the cross-sectional size of the billet of the 60kg / m rail rolling stock is 230mm×230mm, and the three-dimensional model of the rolling stock is established. Initial pass and roll model establishment; then input the performance parameters of rolling material U75V (specific heat, thermal conductivity, stress-strain curve, modulus of elasticity, Poisson’s ratio, coefficient of thermal expansion, density), contact friction coefficient between roll and rolling piece 0.4 and the contact heat transfer coefficient 6, define the thermal work conversion coefficient as 0.9. The deformation, rolling force F, contact stress and temperature change of the rolled piece were obtained by using the finite element method.
[0047] ...
Embodiment 2
[0090] Example 2 Taking the optimization of the roll pass of a 75kg / mU71Mn rail roughing mill as an example
[0091] (1) Model and calculate the rolling process under the target rolling process
[0092] Firstly, the rolling process prediction model is established, and the cross-sectional size of the 75kg / m rail rolling stock blank is 230mm×230mm, and the three-dimensional model of the rolling stock is established. The 75kg / mU71Mn rail roughing mill adopts the five-pass rolling method, and the roll specification and Initial pass and roll model establishment; then input the performance parameters of rolling material U71Mn (specific heat, thermal conductivity, stress-strain curve, modulus of elasticity, Poisson’s ratio, thermal expansion coefficient, density), contact friction coefficient between roll and rolling piece 0.43 and a contact heat transfer coefficient of 6, define the thermal work conversion coefficient as 0.9. The deformation, rolling force F, contact stress and tem...
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