نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
This paper, relying on a developed flower pattern and a geometric model based on the involute curve, investigates the strain stress behavior, the gradual load transfer and the possibility of geometric and mechanical defects in the two processes. The aim is to present an analytical-numerical method for accurately comparing the forming steps, determining the position and angle of the rollers and analyzing the effect of the proposed arrangement on improving the mechanical response of the sheet. The working method includes developing the developed flower pattern, extracting the involute equations, determining the configuration of the five-station rollers by numerical solution in MATLAB and analyzing the stress-strain analysis with a 3D Abaqus model. By comparing the cross section of sheet obtained from the method and that of another reference, validation of the method was confirmed. The equivalent strain study at the first station indicated that the conventional roll forming process produces 15% more strain in the edge area than the flexible process. Also, the longitudinal strain in critical areas such as the edge is 79% lower in the flexible roll forming process than in the conventional roll forming process. The average values of stress obtained show that the flexible roll forming process produces a 27% reduction in stress compared to the conventional one. By gradual control of curvature and more uniform distribution of loading, in the flexible roll forming process not only reduces critical strains, but also effectively reduces the possibility of defects such as edge cracking, local thinning and cross-sectional distortion.
کلیدواژهها English
