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Requirements of Production to Acoustic Resonance Testing

  • : Strama, O1
  • : 1MEDAV GmbH
  • : PDF Download
  • : 2012


As practice shows, with the help of the Acoustic Resonance Testing (ART) cracks and other quality related issues can be found in test specimens. To make this technique interesting for powder metal production environments from the technical and the economical point of view, a number of requirements have to be taken into account. Today, high quality requirements are in contradiction to the challenge, to provide even security-related components at a low price per part. This, on the other hand, requires quality testing methods, which are able to detect quality related issues with high speed and low operating costs. This contribution shows how these conflicting requirements can be solved by Acoustic Resonance Testing. Starting from the basics of this technique, particular these points are referenced, which are crucial for stable long-time operation at the PM production. One of the main requirements is the assessment of the typical production scatter. Usually, the issues to be detected have smaller influences on the resonance frequencies than the production deviations over a long time. The presented MEDAV technique allows detection of conspicuous parts in a series of produced parts, even if they are covered by the overall production scatter. This is solved by an automatic and adaptive algorithm, which can be optimized by a so called quality evaluation loop to avoid pseudo rejects by simultaneously detection of relevant issues.

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