Abstract
A mathematical model of the rolling process in a wire rod block with the determination of the average resultant force of the internal longitudinal forces of the metal in the roll bite deformation is proposed, as a criterion for the rolling process stability, and the analysis of the limits of the process self-regulation from perturbations arising from the wear of the rolls of one of the modules. The influence of the wear of the gauge roll of one of the modules on the rolling parameters in all subsequent modules is revealed, which is manifested in the gradual increase of tension stresses between the modules. Such an increase in tension within the self-regulating equilibrium conditions in the deformation roll bite of the fifth and all subsequent modules leads to a decrease in the rolling moments in these modules and in general for the block. The model allows to determine the maximum wear of the calibers, which maintains the stability of the rolling process, which is estimated by the value of the average resulting longitudinal forces.
Highlights
Analysis of recent research and publicationsIt is well known that in the deformation zone during rolling, external disturbances, to a certain extent, are compensated by the redistribution of friction forces
Запропонована математична модель процесу прокатування в дротовому блоці з визначенням середньої результуючої сили внутрішніх подовжніх сил металу в осередку деформації, в якості критерію сталості процесу прокатування, та виконано аналіз меж саморегулювання процесу від збурювань, що виникають від зношення валків одного з модулів
It is well known that in the deformation zone during rolling, external disturbances, to a certain extent, are compensated by the redistribution of friction forces. Such a redistribution of friction forces manifests itself in a change in the position of the neutral section of the deformation roll bite, which is numerically determined through the angle γ
Summary
It is well known that in the deformation zone during rolling, external disturbances, to a certain extent, are compensated by the redistribution of friction forces. Using the forward slip value in the first pass, we determine the velocity of metal exit from the deformation zone V1 and the rolling constant C = h1 ⋅ b1 ⋅V1. As follows from the data obtained, the rolling process is carried out with minimal tension between the modules and is characterized by sufficient stability This is confirmed by the calculated values of the average resulting longitudinal force — negative values of approximately the same order were obtained for all modules, from –0.009 to –0.016. Using the developed model of the rolling process in the wire block, we performed the simulation of the perturbing effect of the wear of the rolls of the fifth module on the rolling parameters of the entire block
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