Erweiterung von Verschleißmodellen für moderne Warmumformprozesse

authored by

Felix Müller

supervised by

Bernd-Arno Behrens

Abstract

Especially in hot forming processes, which are used to manufacture highly strenght components, wear on the tools used represents a major challenge in process design. To counter this, various approaches for improving wear models for hot forming are presented. Both hot sheet metal forming (tailored tempering) and hot forging (die forg-ing) are addressed. In the case of tailored tempering, a key focus is the heat transfer between the tool and the workpiece, as this is important for estimating tempering ef-fects. Hardness losses of up to 40% after 500 cycles were subsequently demonstrat-ed under process-relevant loads. A method was developed for die forging to investi-gate changes in hardness under additional mechanical stress superposition in the la-boratory in addition to thermal stress. By implementing these results in a commercial FE software, a quantitative prediction accuracy of the tool hardness of more than 90% could be achieved within the context of industry-related validation tests. For a wear prediction it becomes clear that process fluctuations have a considerable influence. A first approach is presented that uses statistical methods to take this influence into ac-count. The work shows that existing numerical wear models can achieve higher-quality forecasting accuracy by including process data and statistical methods.

Organisation(s)

Institute of Metal Forming and Metal Forming Machines

Type

Doctoral thesis

No. of pages

126

Publication date

2024

Publication status

Published

Electronic version(s)

https://doi.org/10.51202/9783959009577 (Access: Closed)
https://doi.org/10.15488/17811 (Access: Open)

 

Details in the research portal "Research@Leibniz University"