Papers by Keyword: Rolling Parameters

Abstract: Ferrite rolling of interstitial free steel strip in the temperature range 650-850°C can effectively reduce furnace costs and scale formation as a result of lower strip reheating temperatures. Different lubrication conditions of lubricating oil, solid lubricant and dry condition were used during ferrite rolling tests of thin interstitial free steel strip on a 2-high Hille 100 experimental rolling mill. Different rolling speed, rolling temperature and reductions were applied to the rolling process. The rolling force and roll roughness were affected by the lubrication conditions and rolling parameters. Solid lubricant indicated an improved performance in terms of the roll roughness, as well as the oxidation property of the strip surface during ferrite rolling.

Abstract: The selection and optimization of screw rolling ball process parameters were analyzed and discussed. The inner stress of ball is the major factor that affects the ball quality during screw rolling of ball. The inner stress is apt to be affected by other related process parameters. In practical, there is no specific measure to determine the parameters. In view of this situation, the influences of roller obliquity, rolling temperature, speed of roller and the outlet distance between guide boards and other parameters on the inner stress of ball were analyzed respectively through orthogonal test. The optimal combination of parameters was found through comparative study on several parameter combinations.

Abstract: The effects of rolling parameters on the broadwise deformation of the workpiece are analyzed by rigid-plastic finite element method. At the basis of better grasping the effective law on freedom broadwise deformation ,the effects of the Oval height and Oval width on the Forced /Restricted broadwise deformation in rolling process are analyzed. Considering the equivalent strain,the effects of the Oval height and Oval width are gotten again using the related strain data in the DEFORM-3D post-processing.

Abstract: The three dimensional finite element models of rod have been built on the basis of thermo-mechanical coupled elastic-plastic FEM in order that the rolling process of No.5 pass is simulated accurately. The distributed rule of friction is calculated and discussed with variable initial rolling temperature, diameters of rollers, reduction in pass and rolling speeds. The results show that the fore sliding region, adhesive region and back sliding region are existent on the surface of rolling material. Furthermore, friction force is calculated by using numerical simulation method and it is a new approach in studying friction. The analysis of friction force is available for reference to optimize processing parameters in the rolling process.

Abstract: Warm-rolling can save the production cost and extend the production kind of hot-rolled IF steel strip, the precipitates strongly influence the annealing process and texture evolution so as to the final mechanical properties of the production, very few studies has relate to the precipitates of IF steels warm-rolled in ferrite region. In present work, two Ti- IF steels were warm-rolled in ferrite region under different rolling parameters and the precipitates were investigated. Transmission electron microscopy (TEM) and Energy dispersion Spectroscopy (EDS) microanalysis were carried out on carbon extraction replicas, the characteristics such as morphology, type, amount and size of precipitates were analyzed. The results show that different type of precipitates were appeared in two steels, TiN, TiS, Ti4C2S2 and TiC were found in common Ti-IF steel, but in high strength Ti-IF steel, the amount of TiS, Ti4C2S2 was very few and FeTiP precipitates appeared, the type and morphology of precipitates were not affected by rolling parameters, however, the number and size of precipitates were changed. Finally, the effect of different P content on the change of precipitates was analyzed, the precipitating mechanism was also discussed.