Selecting the adequate manufacturing technology for producing the heavy and critical machine parts

Abstract

When selecting a production technology of a massive and/or responsible machine part, all the important parameters, including material properties, its price and availability on the market, as well as own technological capabilities and procedure limitations, need to be considered. Knowing all these factors is of a great importance, due to their great influence on the produced parts’ final quality. The machine part, considered in this research, made of the Q+T (quenching + tempering) steel 42CrMo4 and cast steel G42CrMo4, first produced by casting, which was considered as adequate technology due to part’s complex geometry. The non-destructive tests of the newly manufactured part have revealed a large number of defects. To avoid those defects, the alternative production process was proposed, consisting of combination of machining and welding. The parts produced according to this technology did not exhibit any defects, so it was proposed for the batch production.