A cup is to be drawn in a deep drawing operation. The height of the cup is 75 mm and its inside diameter = 100 mm. The sheetmetal thickness = 2 mm. If the blank diameter = 225 mm, determine: (a) drawing ratio, (b) reduction, and (c) thickness-to-diameter ratio. (d) Does the operation seem feasible? Upper limit on the drawing ratio is a value of 2.0 Db De Measures of Drawing DR = D Dp Should be less than 0.50. Reduction r, r =- Db DP 0.7 Drawing force F = nDpt(TS)( Holding force F = 0.015 Y7{D; (D, + 2.2t +2Ra)* } Symbols: Dp = blank diameter D, = punch diameter original blank thickness, mm TS= Tensile strength, Mpa Y = yield strength of the sheet metal = die corner radius, mm %3D %3D Ra