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Process Design of Conical Roll-Shaping for Fabrication of Variable Curvature Spiral Blade
양성문(Sungmoon Yang),심도식(Dosik Shim),지호성(Hoseong Ji),백준호(Joonho Baek),김봉식(Bongsik Kim),안석영(Seokyoung Ahn),박상후(Sanghu Park) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.11
A conical roll-shaping process was proposed for fabrication of a metallic spiral blade applied to a small-scale wind turbine system. A spiral blade has continuously different curvatures, with a range of 100 to 350 ㎜ radius. To fabricate this complex shape, we developed a conical rollshaping process having two main conical rollers for feeding a blank sheet, and two cylindrical side rollers for control of local bending. For clear understanding of the process parameters, numerical analyses were conducted using a commercial code, Pam-Stamp. This study optimized the effects of process parameters, such as gap and angle between the main rollers and side rollers, and also the movement of side rollers. In order to increase the forming efficiency, a central rotation point was also calculated by the analytical approach. This developed rolling process can thus be utilized in a sheet metal forming process for obtaining spirally curved sheet metal shapes.