A Solid Cylindrical Copper Slug Of 100 Mm In Diameter And 100 Mm In Height Was Reshaped In An Open Die Forging Process U 1 (46.01 KiB) Viewed 20 times
A Solid Cylindrical Copper Slug Of 100 Mm In Diameter And 100 Mm In Height Was Reshaped In An Open Die Forging Process U 2 (44.53 KiB) Viewed 20 times
A solid cylindrical copper slug of 100 mm in diameter and 100 mm in height was reshaped in an open die forging process using flat dies to reduce the height by 50% at room temperature. Assuming that the coefficient of friction was 0.2. (a) Based on the effect of percent cold work on the mechanical properties of the copper shown in the figure below, calculate the forging force at the initial forging. Note that percent cold work is Ao-Af defined as x 100%, where A, is the original cross-sectional area of the metal and A, is Ao the final cross-sectional area after shaping. (4 marks) (b) If the forging was conducted at room temperature by impression-die forging that the final projected area of the flash was 30% greater than the final projected area of the forged workpiece. Calculate the forging force at the end of the stroke. Note that K = 350 MPa and n = 0.55 for the copper, and the multiply factor k = 5. (6 marks)
Strength (MPa) 600 400 200 0 Tensile strength 20 Yield strength % Elongation 40 60 Percent cold work 80 100 90 80 70 60 50 40 30 20 10 100 % Elongation
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