Development of Friction Stir Incremental Forming Process Using Penetrating Tool

Abstract

Abstract In order to form sheet metals into concave-convex shape without using special machines or dies, a new forming method called friction stir incremental forming using penetrating tool was proposed. A forming tool called a penetrating tool was originally developed and this tool was composed of two dome shape tools, which located between an upper tool and a lower tool symmetrically and were jointed of a screw. Pure aluminum JIS: A1050-O sheets having a thickness of 2 mm were used for workpiece. Sheets were formed into a truncated cone shape. Concave, convex and concave-convex shapes were formed successfully by the proposed method. The effect of tool rotation direction, clockwise and counter clockwise, was also investigated.