{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T01:23:57Z","timestamp":1768353837493,"version":"3.49.0"},"reference-count":27,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2013,5,14]],"date-time":"2013-05-14T00:00:00Z","timestamp":1368489600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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\u2019 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.<\/jats:p>","DOI":"10.3390\/s130506365","type":"journal-article","created":{"date-parts":[[2013,5,14]],"date-time":"2013-05-14T11:21:04Z","timestamp":1368530464000},"page":"6365-6379","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Acoustic Emission Detection of Macro-Cracks on Engraving Tool Steel Inserts during the Injection Molding Cycle Using  PZT Sensors"],"prefix":"10.3390","volume":"13","author":[{"given":"Rajko","family":"Sve\u010dko","sequence":"first","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia"}]},{"given":"Dragan","family":"Kusi\u0107","sequence":"additional","affiliation":[{"name":"TECOS Slovenian Tool and Die Development Centre, Kidri\u010deva 25, Celje 3000, Slovenia"}]},{"given":"Toma\u017e","family":"Kek","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, University of Ljubljana, A\u0161ker\u010deva 6, Ljubljana 1000, Slovenia"}]},{"given":"Andrej","family":"Sarja\u0161","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia"}]},{"given":"Ale\u0161","family":"Han\u010di\u010d","sequence":"additional","affiliation":[{"name":"TECOS Slovenian Tool and Die Development Centre, Kidri\u010deva 25, Celje 3000, Slovenia"}]},{"given":"Janez","family":"Grum","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, University of Ljubljana, A\u0161ker\u010deva 6, Ljubljana 1000, Slovenia"}]}],"member":"1968","published-online":{"date-parts":[[2013,5,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Zheng, R., Tanner, R.I., and Fan, X.-J. (2011). Injection Molding: Integration of Theory and Modeling Methods, Springer.","DOI":"10.1007\/978-3-642-21263-5"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1108\/01445159910280056","article-title":"Monitoring cavity pressure perfects injection molding","volume":"19","author":"Collins","year":"1999","journal-title":"Assem. Autom."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"419","DOI":"10.1016\/j.jmatprotec.2006.10.037","article-title":"Cavity pressure based grey prediction of the filling-to-packing switchover point for injection molding","volume":"183","author":"Huang","year":"2007","journal-title":"J. Mater. Process. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/S0924-0136(02)00445-4","article-title":"A study on quality monitoring of injection-molded parts","volume":"136","author":"Min","year":"2003","journal-title":"J. Mater. Process. Technol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1016\/S0890-6955(96)00069-7","article-title":"The use of cutting force and acoustic emission signals for the monitoring of tool insert geometry during rough face milling","volume":"37","author":"Wilcox","year":"1997","journal-title":"Int. J. Mach. Tools Manuf."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/S0890-6955(01)00108-0","article-title":"A brief review: Acoustic emission method for tool wear monitoring during turning","volume":"42","author":"Li","year":"2002","journal-title":"Int. J. Mach. Tools Manuf."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"215","DOI":"10.4028\/www.scientific.net\/MSF.589.215","article-title":"Assessment of laser-cut quality on the basis of acoustic emission signals captured with a PZT sensor","volume":"589","author":"Grum","year":"2008","journal-title":"Mater. Sci. Forum"},{"key":"ref_8","first-page":"179","article-title":"AE signals during laser cutting of different steel sheet thicknesses","volume":"28","author":"Kek","year":"2010","journal-title":"J. Acoust. Emiss."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"599","DOI":"10.3390\/s110100599","article-title":"Study and application of acoustic emission testing in fault diagnosis of low-speed heavy-duty gears","volume":"11","author":"Gao","year":"2011","journal-title":"Sensors"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"3901","DOI":"10.3390\/s120403901","article-title":"Monitoring and failure analysis of corroded bridge cables under fatigue loading using acoustic emission sensors","volume":"12","author":"Li","year":"2012","journal-title":"Sensors"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"4793","DOI":"10.3390\/s120404793","article-title":"Fiber optic sensor for acoustic detection of partial discharges in oil-paper insulated electrical systems","volume":"12","year":"2012","journal-title":"Sensors"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"6953","DOI":"10.3390\/s120606953","article-title":"Sensoring fusion data from the optic and acoustic emissions of electric arcs in the GMAW-S process for welding quality assessment","volume":"12","author":"Alfaro","year":"2012","journal-title":"Sensors"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"9502","DOI":"10.3390\/s120709502","article-title":"Monitoring of temperature fatigue failure mechanism for polyvinyl alcohol fiber concrete using acoustic emission sensors","volume":"12","author":"Li","year":"2012","journal-title":"Sensors"},{"key":"ref_14","unstructured":"Luo, R.C., and Chen, C.M. (2000, January 22\u201328). PZT Thin Film Pressure Sensor for On-Line Monitoring Injection Molding. Nagoya, Japan."},{"key":"ref_15","unstructured":"Luo, R.C., and Tsai, C.S. (December, January 29). Thin Film PZT Pressure\/Temperature Sensory Arrays for On-Line Monitoring of Injection Molding. Denver, CO, USA."},{"key":"ref_16","unstructured":"International Organization for Standardization (ISO) (2002). Plastics-Injection Moulding of Test Specimens of Thermoplastic Materials\u2014Part 3: Small Plates, ISO294-3:2002(E)."},{"key":"ref_17","unstructured":"Miller, R.K., Hill, E.K., and Moore, P.O. (2005). Nondestructive Testing Handbook: Acoustic Emission Testing, American Society for Nondestructive Testing. [3rd ed.]."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1704","DOI":"10.1016\/j.engstruct.2010.02.020","article-title":"Acoustic emission monitoring of bridges: Review and case studies","volume":"32","author":"Nair","year":"2010","journal-title":"Eng. Struct."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1016\/S0308-0161(01)00038-2","article-title":"Acoustic emission testing of repaired storage tank","volume":"78","author":"Kwon","year":"2001","journal-title":"Int. J. Pressure Vessels Pip."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1923","DOI":"10.1016\/S0266-3538(98)00013-X","article-title":"An acoustic-emission characterization of the failure modes in polymer-composite materials","volume":"58","author":"Giordano","year":"1998","journal-title":"Compos. Sci. Technol."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"559","DOI":"10.14429\/dsj.58.1677","article-title":"Analysis of acoustic emission signals using wavelet transformation technique","volume":"58","author":"Rao","year":"2008","journal-title":"Def. Sci. J."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Mallat, S.G. (1998). A Wavelet Tour of Signal Processing, Academic Press.","DOI":"10.1016\/B978-012466606-1\/50008-8"},{"key":"ref_23","first-page":"1","article-title":"Wavelet transform and its applications to acoustic emission analysis of asphalt cold cracking","volume":"12","author":"Nesvijski","year":"2007","journal-title":"E J. NDT"},{"key":"ref_24","first-page":"145","article-title":"Frequency filtering algorithms of plate wave AE for source location","volume":"24","author":"Kurokawa","year":"2006","journal-title":"J. Acoust. Emiss."},{"key":"ref_25","unstructured":"Anderson, T.L. (1995). Fracture Mechanics: Fundamentals and Applications, CRC Press."},{"key":"ref_26","unstructured":"International Organization for Standardization (ISO) (2001). Plastics-Injection Moulding of Test Specimens of Thermoplastic Materials\u2014Part 4: Determination of Moulding Shrinkage, ISO294-4:2001(E)."},{"key":"ref_27","unstructured":"Vallen, H. (2006). Acoustic Emission Testing: Fundamentals, Equipment, Applications, Castell."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/13\/5\/6365\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:46:43Z","timestamp":1760219203000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/13\/5\/6365"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,5,14]]},"references-count":27,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2013,5]]}},"alternative-id":["s130506365"],"URL":"https:\/\/doi.org\/10.3390\/s130506365","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2013,5,14]]}}}