Ultrasonic-assisted forming - Influence of unavoidably induced tool oscillations

Jäckisch M, Merklein M (2022)

Publication Language: English

Publication Type: Conference contribution, Original article

Publication year: 2022

Pages Range: 110-115

Event location: Zauchensee AT

ISBN: 978-3-902078-27-8


Enhanced material strengths and a growing demand for complex part geometries lead to elevated process forces in cold forming processes and in turn to increased tool wear. One approach to face these challenges is the application of ultrasonic-assistance. By superimposing a high frequency oscillation to the tool movement, the material’s flow stress is reduced immediately and forming with lower process forces is feasible. This beneficial softening enhances with increasing vibrational energy input. Thus, the oscillation amplitude has been determined as the crucial process parameter for the achievable force reduction. When superimposing the punch with a high frequency oscillation, the vibration is introduced not only into the workpiece itself, but also through it into the fixed die. Consequently, moderate unavoidable oscillations occur in the fixed tool. In dependency of the phase shift between the oscillating tools, the nominal amplitude can be amplified or weakened. Nevertheless, most studies focused merely on the nominal amplitude. Within this contribution ultrasonic-assisted compression testing with pure copper Cu-OFE and brass CuZn37 is carried out and the oscillations of the upper and lower tool are measured synchronously. Significant deviations between the introduced and the effective oscillation are determined, leading to alternated process parameters.

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Jäckisch, M., & Merklein, M. (2022). Ultrasonic-assisted forming - Influence of unavoidably induced tool oscillations. In Univ.-Prof. Dipl.-Ing. Dr.techn. Martin Stockinger (Eds.), Proceedings of the XL. Conference on Metal Forming (pp. 110-115). Zauchensee, AT.


Jäckisch, Manuel, and Marion Merklein. "Ultrasonic-assisted forming - Influence of unavoidably induced tool oscillations." Proceedings of the XL. Conference on Metal Forming, Zauchensee Ed. Univ.-Prof. Dipl.-Ing. Dr.techn. Martin Stockinger, 2022. 110-115.

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