1Mech. Engineer, Shoubra Faculty of Engineering, Mechanical Production Department, Benha University, Egypt
2Assoc. Prof., Dr. Shoubra Faculty of Engineering, Mechanical Production Department, Benha University, Egypt
3Assoc. Prof., Dr. Shoubra Faculty of Engineering, Mechanical Production Department, Benha University, Egypt
Online published on 21 March, 2018.
To improve tool life of blanking punches four types of PVD coatings were used, TiN coating, TiCN coating, TiAlN coating and CrN coating. In this work, the mechanical properties such as hardness, wear and fatigue were studied. All types of coating are deposited on blanking punches which were hardened to reach core hardness 60–62 HRC and grinding to get surface roughnessRa = 0.4 μm. The hardness test, wear test and fatigue test were used to characterize the punches properties especially durability and life time. An A10 washer stamp was used to try out the punches and a high number of strokes were done for every punch. It was found that the TiAlN coated punch has the best properties. It had highest hardness value, lowest wear rate value, had maximum number of cycles to failure, and most ultimate stress. Also the TiAlN coated punch suffered from less wear and had most smother performance. Finally, a mathematical modeling correlating between hardness, wear and fatigue of blanking punch with the chemical composition of PVD coating type were developed.
Blanking Punch, Hardness, Wear, Fatigue
