Sensors 2013, 13(5), 6365-6379; doi:10.3390/s130506365
Article

Acoustic Emission Detection of Macro-Cracks on Engraving Tool Steel Inserts during the Injection Molding Cycle Using PZT Sensors

1 Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia 2 TECOS Slovenian Tool and Die Development Centre, Kidričeva 25, Celje 3000, Slovenia 3 Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, Ljubljana 1000, Slovenia
* Author to whom correspondence should be addressed.
Received: 23 March 2013; in revised form: 16 April 2013 / Accepted: 19 April 2013 / Published: 14 May 2013
(This article belongs to the Special Issue Piezoelectric Sensors and Actuators)
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Abstract: 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 inserts were tested during the production of standard test specimens, each under the same processing conditions. By closely comparing the captured AE signals on both engraving inserts during the filling and packing stages, we were able to detect the presence of macro-cracks on one engraving insert. Gabor wavelet analysis was used for closer examination of the captured AE signals’ peak amplitudes during the filling and packing stages. The obtained results revealed that such a system could be used successfully as an improved tool for monitoring the integrity of an injection molding process.
Keywords: injection molding; process monitoring; acoustic emission; PZT sensors; piezoelectric effect

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MDPI and ACS Style

Svečko, R.; Kusić, D.; Kek, T.; Sarjaš, A.; Hančič, A.; Grum, J. Acoustic Emission Detection of Macro-Cracks on Engraving Tool Steel Inserts during the Injection Molding Cycle Using PZT Sensors. Sensors 2013, 13, 6365-6379.

AMA Style

Svečko R, Kusić D, Kek T, Sarjaš A, Hančič A, Grum J. Acoustic Emission Detection of Macro-Cracks on Engraving Tool Steel Inserts during the Injection Molding Cycle Using PZT Sensors. Sensors. 2013; 13(5):6365-6379.

Chicago/Turabian Style

Svečko, Rajko; Kusić, Dragan; Kek, Tomaž; Sarjaš, Andrej; Hančič, Aleš; Grum, Janez. 2013. "Acoustic Emission Detection of Macro-Cracks on Engraving Tool Steel Inserts during the Injection Molding Cycle Using PZT Sensors." Sensors 13, no. 5: 6365-6379.

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