Abstract
The production process decisively influences the service life and its scatter of forged parts. By aligning the forging process for strength and by taking account of additional after-treatment, the service life of a running-gear component, starting from a pre-series part, was increased by more than a factor of four without exhausting all possibilities offered by the shape and the production process. The service life nevertheless did not reach that of a part milled from a block of the same basic material. The various ways of increasing the fatigue strength by optimizing the forging process and the after-treatment, as well as their influence on the fatigue life are shown in this study. It is shown, how various defects typical of forged parts stemming from series-production affect the component's service life. Opportunities of improving the processes are presented. Beside the necessary methods of optimizing the process, the need for revising the relevant national standards concerning the surface quality and dimensional tolerances of forged parts is pointed out.
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