Going beyond the actual forging process, the subsequent tempering and stress relieving performed on the crankshaft forging is decisive in terms of quality. For the purpose of tempering, the forgings are heated in bogie hearth furnaces. The temperature must therefore be above the limit for structural transformation. Following this, the forgings are quenched in oil or water baths in order to harden them. They are then tempered at a low temperature and slowly cooled in order to provide the steel with the necessary toughness. By performing the various heat treatment steps, it is possible to precisely configure the mechanical and technological properties of the crankshaft forgings. This is an area in which the experience and specialist knowledge of the experts at Maschinenfabrik ALFING Kessler is particularly significant. Our material experts are able to precisely coordinate the settings in line with the customer requirements and the customer application.
A glowing crankshaft forging exits the bogie hearth furnace and is transported to the oil basin by a transport system.
A forging is removed from the oil bath in which it has been quenched and hardened.