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FEM과 Thickness Analysis를 이용한 판금성형해석
林尙憲 영남이공대학 1997 論文集 Vol.26 No.-
Sheet metal forming processes experience very complicated deformations effected by processes parameters such as the blank shape, blank holding force, die geometry, sheet thickness, friction, and so on. Although these process parameters influence the deformation mechanism and the quality of deformed parts, the optimum values of process parameters are determined by intuition and experience through trial and error. A more systematic method such as finite element analysis can simulate complicated sheet metal forming processes and provide useful information. However, general finite element analysis is generally carried out with given process parameters and thus requires numerical trial and error with enormous time and cost to determine the optimum values of process parameters. For this reason, some approaches to find directly the process parameters have been developed In this method the input of mathematical model includes part geometry, forming node, material properties, forming speed, and coefficients of friction. The output includes strain distributions and forming severity derived from the Forming Limit Diagram. The mathematical model identifies critical forming zones during the initial part design stage and allows what-if scenarios to be investigated before the final design is committed to soft or hard tooling. The designer can evaluate various design versus production options for reducing the severity of the stamping. By the measuring of the thickness variation of deformed part on ultrasonic measuring machine and through the monitoring of forming process variables such as material variation and tool wear, the thickness analysis has product.
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