Description
Increased environmental awareness in society is leading to the adoption of more and more legislation and programmes to reduce energy demand and improve resource efficiency. With the help of cold forging, resource-efficient production of components with very good mechanical properties is possible. Within the scope of this work, a holistic characterization of the influence of different process steps of the cold forging process chain on the resulting component properties was carried out. The investigations focus on the component properties from the entire process chain of a multi-stage cold forging process with special consideration of different heat treatment methods. The basis for the systematic investigations is the holistic characterization of the properties of the components produced by forming technology. The investigations included strain hardening and hardness, topography and roughness, the microstructure of the material and the resulting residual stresses. At the same time, a numerical simulation of the forming process was carried out in order to analyse correlations between material flow, stress distribution and resulting component properties. On the basis of these findings, the dynamic strength was determined with the aid of test devices developed specifically for the component. Finally, an analysis of the influence of the production-related component properties on the dynamic strength was carried out. By correlating the component properties with the determined dynamic loads, it was possible to identify the fundamental influences and their interactions for different dynamic loads. Based on the gained knowledge, recommendations are given for the design of the processes for the targeted adjustment of the component properties. The investigations make it possible to use the advantages of cold-forged components and to consider not only static strength but also dynamic strength in the development process.
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