Tomaz Kek

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The paper presents results of an analysis of acoustic emission (AE) measurement in laser cutting of a DC04 steel plate. Laser cutting was evaluated on the basis of monitoring the acoustic emission in the course of cutting and of an analysis of events occurring in the material after the completion of laser cutting. It was found that the cutting oxygen flow(More)
This paper presents an improved monitoring system for the failure detection of engraving tool steel inserts during the injection molding cycle. This system uses acoustic emission PZT sensors mounted through acoustic waveguides on the engraving insert. We were thus able to clearly distinguish the defect through measured AE signals. Two engraving tool steel(More)
The paper treats the results obtained in simultaneous measurements of acoustic emission with PZT AE sensors and of deformations with resistance measuring rosettes carried out during and immediately after laser cutting-out of a deep-drawn sheet product, i.e. mudguard. The presence of a field of residual stresses produced by deep-drawing is characteristic of(More)
This paper presents measurements of acoustic emission (AE) signals during the injection molding of polypropylene with new and damaged mold. The damaged injection mold has cracks induced by laser surface heat treatment. Standard test specimens were injection molded, commonly used for examining the shrinkage behavior of various thermoplastic materials. The(More)
This paper presents the experimental results regarding acoustic emission signals measured during the injection molding of those standard test specimens commonly used for examining the shrinkage behaviour of various thermoplastic materials. In daily industrial production of different plastic products we often have to deal with various errors that practically(More)
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