When designing an open-die forge process for a stainless steel cylindrical part: a) Why would you want to estimate forging force? b) Will the required force be higher at the start or the end of the process? Explain with reference to the forging force equation. c) If the solid cylindrical workpiece starts as 200mm in diameter and 100mm in height, what is the forging force? Assume the flow stress is 1100MPa, and the coefficient of friction is 0.2 d) What will the forging force be when the height has been reduced by 50%?