The Accuracy of Forging Load Estimation in Drop Forging
Methods proposed for estimating forging loads have been reviewed and their accuracy determined by comparing calculated loads with those measured on forging presses.
None of the methods considered was consistently accurate; the better ones typically gave about one fifth of all estimates within ± 10% of the measured load, one third to one half within ± 25% and three quarters within ± 50%.
Two new statistical methods have been developed which give a useful, if unspectacular improvement in accuracy. Both are simple to apply and easily usable on the shop floor.
The methods were developed from data obtained during the forging of mild steel and low carbon carburising steels, but a table is given which allows load estimation for all commonly forged engineering steels.
The methods also allow the influence of forging temperature and flash land design on forging load to be estimated.
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