The Wave Motion of the Rolling Force during Variable Gauge Rolling

Abstract

The variable gauge rolling process is a new technology designed to produce flat products of different thicknesses such as longitudinal profile (LP) plates and tailor rolled blanks (TRB), which are used in bridge building, shipbuilding, and automobile manufacturing, etc., to decrease the weight and the welding times, etc. In this paper, a series of numerical studies on the wave motion of rolling force in variable gauge rolling (in three stages: down rolling, flat rolling, and upper rolling) were carried out using the finite element method to obtain the deformation of the work piece at different stages of rolling. The rolling force and its wave motion during rolling were analyzed under a variety of reduction ratios, including the coefficient of friction, initial thickness of the plates, and diameters of the rolls. The rolling force obviously increases as the reduction in the down rolling process increases, and then decreases during upper rolling. The rolling force consists of two abrupt wave motions in the transitional zones during the down to flat rolling stage, and the flat to upper rolling stage. These results are significant with regards to precisely controlling the deformation of workpiece in the transition zone during variable gauge rolling.

Effects of Deformation Conditions on the Rolling Force during Variable Gauge Rolling

“…In comparison with the results obtained by Yu et al [16], similar trends were obtained for the variations in the DRF with thickness reduction, roll diameter and friction coefficients. However, the magnitude of these variations are not comparable as their work was not validated with experimental data.…”

“…In both of these studies, the effects of friction coefficient, roll diameter and absolute thickness reduction on variations of rolling force during VGR were not studied. In another study, Yu et al [16] studied the variations of rolling force during variable gauge rolling by finite elements simulations; however, no experimental data was provided to support the findings. Furthermore, the potential reasons behind these variations during different stages of variable gauge rolling were not discussed.…”

Prediction and Analysis of the Force and Shape Parameters in Variable Gauge Rolling

“…Then the calculation formulas of the roll separating force, neutral angle, and forward and backward slips were determined. Yu et al [22] analyzed the fluctuation of roll separating force in variable gauge rolling using finite element software, and researched the influences of the reduction, friction, and radius on the roll separating force. The exit position of the workpiece is not on the centerline of the two cylindrical work rolls in the variable gauge rolling, so the thickness of the exit zone is not equal to the loaded roll gap.…”

Review on Modeling and Simulation of Blast Furnace

“…Both phenomena significantly affect the burden radial distribution and can readily be predicted using DEM charging models over a wide range of conditions. [79,[124][125][126][127][128][129][130][131][132] Such capability is, however, difficult to achieve by single particle based models. [121][122][123][124] For example, the formulation of coke layers, although complicated, can be well predicted by the DEM simulations simply based on spherical particles if the friction coefficients are carefully chosen, as demonstrated in the work of Liu et al [125] (see Fig.…”