Status quo of stress simulation for hot and warm work piece temperatures in forging

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Hot forging dies are subjected to high mechanical, thermal and chemical loads. These loads can lead to die failure and therefore are one of the main cost factors in forging industry. The billet temperature is the process parameter mainly influencing the loads in forging processes. In warm forging the billet temperature is much lower than in hot forging. Warm forging becomes more and more important due to the advantages against hot and cold forging. This paper describes an analysis of FE-simulations of the change in loads on forging dies and the effect on the die life time by changing from hot to warm forging processes. Furthermore a method is presented which enables a calculation of thermal stresses in forging processes.

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Dipl.-Ing. Johannes Knust, Dr.-Ing. Malte Stonis, Prof. Dr.-Ing. Bernd-Arno Behrens
IPH - Institute of Integrated Production Hannover gGmbH Hollerithallee 6 30419 Hannover Germany