| Summary: | 碩士 === 北臺灣科學技術學院 === 機電整合研究所 === 99 === The capability of predicting the sheet metal part final geometry as well as springback amount is an important feature in the sheet metal bending processes. The occurrence of grain size effect make the application of a traditional process design methodology difficult. Therefore, the design of micro-forming operations is still largely performed through empirical techniques. While the design work is made by way of tools and processes, for effectively compensating and eliminating the springback, to understand the influence of grain size effects on springback is an important and powerful way. In this paper, the heat treatment was carried out for 99.5% Ferrum specimens at different temperature to obtain the objective grain size. A V-bending process was conducted for investigating the different objects. One of the objects is to discuss the springback considering the geometric size effect based on the same grain size while the specimens were bent with different thickness. In another object, discussion of grain size effect with springback measurement based on a same thickness situation is expressed. In the third object, the illustrations of experimental results are detailed with the punch radius and springback in sheet metal bending processes. The expression of the fourth object is detailed with the effect of punching speed during the V-bending process. Furthermore, this paper adopted the finite element method with the macro deformation module of DEFORM-3D software code to simulating the V-bending process.
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