An Analysis of Sheet Metal Elliptical Cup Drawing and Elliptical Hole-flanging Processes

• Main Authors: Wang,Yuhsiang, 王昱翔
• Other Authors: Huang,Yuungming
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/06237532778782981816

碩士 === 聖約翰科技大學 === 自動化及機電整合研究所 === 99 === This essay is base on I-DEAS to build a module and to grid computing, and adopting the conception of the Prandtl-reuss plasticity equations, the von Mises yield criterion, large deformation finite element model, and updated Lagrangian formulation (ULF) to use the DYNAFORM Finite Element Method, FEM simulator. Using the values of tensile testing on cold rolled steel (SPCC-SD) to be the standard values of production procedure simulation analyzing, and simulating the deep drawing process of elliptical cup and the elliptical hole convex axis forming. Then the relationship of punch loading and stroke, deformation history, thickness change history, and forming limit. Using 50-ton hydraulic machine to examine the deep drawing of elliptical cup and the elliptical hole-flanging process. And compare simulation values with examined values. Regarding to the deep drawing process of cylindrical cup, the minimum thickness is at the contact area of parts and long punch axle. That is because the material Withstand the maximum tensile stress at this area. From the limit drawing ratio of perimeter of Convex axis and perimeter of material, we can know that the limit drawing rate is 2.136. During process, the perimeter of material will affect the limit of forming, Regarding to the elliptical hole-flanging forming, the maximum stresses and minimum thickness is at the contact area of parts and long punch axle. That is because the material withstand the maximum tensile stress at the area of internal elliptical hole, and force the thickness become thin. Regarding to short axle, the Radius of curvature is big, so the thickness is not changed. From the limit drawing ratio of circumference of elliptical punch profile and the circumference of the minimal initial elliptical punch profile of the minimal initial elliptical hole of the blanks. We can know that the limit drawing rate of elliptical hole-flanging is 1.463. During process, the bore diameter of material will affect the material’s limit of forming, This essay is base on I-DEAS module design and DYNAFORM finite element method, FEM simulator to analysis the authenticity and reliability. It can provide the reference for the staffs who are in mold design and process analysis field. As process improvement, mold design, and simulation analysis of defects estimated reference.