Analysis of ejection in precision forging

Abstract A theoretical model for predicting loads for ejecting precision forgings from a die, has been developed. This has been used to determine the effects of forging load, friction and die wall/workpiece interface contact area on ejection load of cylinders forged at room and elevated temperatures. Experimental results obtained for cold and warm forgings, compare well with theoretical predictions. At higher temperatures (above 800°C), neglect of oxidation and post forging thermal contraction in the theory makes it unable to predict results with sensible accuracy.