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1 Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje

1 1999

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Supervising of metal forming processes by acoustic emission

Barschdorff D., Haupt H.

Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje

1999

Vol. 86, nr 24

74-80

During deep drawing of metal components an automatic quality control is necessary to detect cracks or orifices. A reliable recognition of crack development during the deep drawing is process is presently not possible. In this paper a method to supervise deep drawing processes with acoustic emission is discussed. Acoustic emission arise from rapid state changes by exceeding of stress limits in microscopic range. During crack formation energy is set free and delivered to the environment as a dilational wave, which wave, which on flat structures spread as surface waves. Acoustic emission signals having a low energy content are superimposed by machine vibrations, shocks and stream noise. For a reliable detection of acoustic emission they must by characterised. Bending tests with metal strips have been performed. First results of the investigations are presented in this paper. Several sensor systems have been investigated regarding their suitability in practice.