Wear Evolution on PVD Coated Cutting Tool Flank and Rake Explained Considering Stress, Strain and Strain-Rate Dependent Material Properties

被引:4
|
作者
Bouzakis, Antonios [1 ]
Skordaris, Georgios [2 ]
Bouzakis, Emmanouil [3 ]
Bouzakis, Konstantinos-Dionysios [2 ]
Tsakalidis, Dimitrios [2 ]
机构
[1] Impact BZ, London SW11 5QL, England
[2] Aristotle Univ Thessaloniki, Mech Engn Dept, Lab Machine Tools & Mfg Engn, Thessaloniki 54124, Greece
[3] Univ Thessaly, Dept Mech Engn, Volos 38334, Greece
关键词
PVD-coating; fatigue; strain; strain rate; impact test; milling; MECHANICAL-PROPERTIES; FATIGUE FAILURE; CARBIDE TOOL; PERFORMANCE; COATINGS;
D O I
10.3390/coatings13121982
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Impact loads developed on a tool cutting edge when milling into a workpiece material are prevailing metrics for explaining coating fatigue failure and the subsequent tool-wear evolution. For predicting related stress and strain fields in the compound coating-substrate, stress, strain, and strain-rate, dependent material properties are required. The attainment of such data is briefly described in the paper. Considering these data, the occurring strains in the cutting edge at various entry impact durations, i.e., strain rates, were calculated and compared with fatigue-critical strains. In this way, the wear phenomena causing the coating failure on the flank and rake during milling were clarified. The attained results were also correlated to corresponding ones in turning, where the dynamic loads of the cutting edge are comparably negligible. The conducted investigations showed that the fatigue-critical strains strongly diminish, when the relevant strain rates increase; thus, leading to a remarkable tool-life reduction. This happens, because the increase of the strain-rate restricts the time for the dislocations movements; thus, regions with stress concentrations occur, deteriorating the material ductility, increasing its brittleness, and diminishing the fatigue critical strains. In cutting operations, where the coating fatigue is the main wear factor, the tool-life can be predicted considering these phenomena. In the paper, relevant experimental analytical procedures are introduced.
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页数:17
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