| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 100 === In recent years, studies of tool path planning in single point incremental sheet forming (SPIF) were mostly focused on the step-type tool path forming forces. This paper planned two tool path models, step-type tool path model and spiral tool path model, in single point incremental forming operations and investigated the differences of forming forces, finished surface quality, forming limit of wall-angle, thickness and surface roughness between these two path models. This paper used CAD / CAM system to generate the step-type and spiral-type forming paths of punch and output NC (numerical control) codes of these tool paths in order to perform SPIF experiments on CNC milling machine. The experimental sheet material was appropriately fixed in a special designed clamping fixture mounted on the dynamometer in order to measure the SPIF forces during punch tool moving driven by NC commands. The results show the spiral path model can get more stable forming forces and better surface quality than that of step-type path model. This paper also tested the maximum formed wall-angle of the cone work-piece by using step-type path and spiral path models. The experimental results show that the spiral path model has a little better than the step-type model. For the measured thickness distribution, the thickness is thinner with increasing punch diameter. The measured surface roughness shows that the tool path models and the punch diameter have less affected, but the surface will be roughing when vertical step is large.
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