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

Sensors

Rajko Svečko³  Dragan Kusić¹  Tomaž Kek²  Andrej Sarjaš³  Aleš Hančič¹ 

[1] TECOS Slovenian Tool and Die Development Centre, Kidričeva 25, Celje 3000, Slovenia; E-Mails:;Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, Ljubljana 1000, Slovenia; E-Mail:;Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia; E-Mails:

关键词: injection molding;    process monitoring;    acoustic emission;    PZT sensors;    piezoelectric effect;   

DOI  :  10.3390/s130506365

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.