Abstract
AbstractDue to the processing of high-strength materials in fine blanking, the lifetime of conventional high-speed steel punches decreases rapidly. Materials with higher wear resistance and compressive strength, such as cemented carbide, are investigated for use in fine blanking processes. However, cemented carbide punches often fracture during the stripping off phase due to the combined tensile and flexural stress collective. The understanding of fracture mechanisms and subsequent fracture prevention supports the application of cemented carbides. The fracture mechanisms during stripping off are mostly unknown. The objective is to identify fracture mechanisms of cemented carbide punches. The fracture mechanism of cemented carbide punches was metrologically monitored by means of acoustic emission (AE) and process forces. The fracture pattern was analyzed related to the measured signals. In order to interpret the AE signal, basic process analyses were performed. Subsequently, a punch fracture of cemented carbide was provoked with the high-strength steel 1.8974. Cemented carbide punches tend to fracture during stripping off as a cause of asymmetrical interactions with the scrap web.KeywordsFine blankingCemented carbideAcoustic emissionStripping off
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