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Multi-level signal processing for very precise ultrasonic measurement on machine tools

The integration of metrology into the manufacturing process is becoming more and more important for production technology. The measurement directly on machine tools is especially improving manufacturing strategies. So far optical or tactile measuring systems are the state-of-the-art for dimensional measurements in process metrology. However, the wall thickness of structures with inner cavities can not be measured with these systems. Due to these deficits, an ultrasonic system has been integrated into the periphery of a machine tool. Both the extensive, multi-level signal processing of the acoustic echoes and the developed software tool “μ-sonic” are discussed in the paper. The aim of this presentation is to illustrate the potential of the ultrasonic in-line measurement. Finally, the practical realization for a lathe and initial results are presented.