Investigation of FM heavy forging process by the Moiré method Part III: A direct forging process standard

Abstract

For producing large high quality forgings, a detailed procedure for planning the process based on systematic research is needed. Little work can be found on the process standard of the Free from Mannesmann (FM) method. In Part I [1] and II [2], the single and consecutive reduction results of the FM forging process were reported. The optimal Anvil Width Ratio (AWR) was found to be W/H 0 = 0.6. The rational turnover and anvil staggering procedure were obtained. In this paper, first the difference of the forging effect between an initially round and a square cross section testpiece is discussed. Secondly, for planning the rational anvil distribution in the real production process, the elongation rate and spread rate during the forging process are obtained. Finally, based on systematic investigation on the FM forging process, a standard for the direct FM reduction process which can ensure the internal quality of large forgings, is proposed and discussed.