Cutting performance of advanced multilayer coated (TiAlN/ AlCrN) in machining of AISI D2 hardened steel

摘要: The hard machining of hardened steeI with advanced cutting tool has several advantages over conventional method such as short cycle time, process flexibility, compatible surface roughness, higher material removal rate and less environment p-oblems absence fluid. However, caused severe wear and changes to quality pehrmance product due mechanical stress and heat generation. Thus, proper criteria should be adopted keep the longer tool life maintaining suface integrity. In this work, an experimental investigation was conducted characterize machinability of multilayer TiAlNIAlCrN coated carbide tools integrity in end milling of AISI D2 steel (58-62 HRC) on a Vertical Machining Centre (VMC). The variables were speed (80-120 dmin) radial depth cut (3-5 rnrn), meanwhile feed per tooth (0.05 mm) cut (0.5 were kept constant. Tool volume removed decreased cutting speed increased temperature contact area. Built-up edge formation, groove chipping dominant tool faiIure modes; however, subjected adhesion and abrasive for duration testing. highest removed and 1500 mm3 4.97 min which associate 100 dmin 4 mm. Ra values attained throughout experiments range 0.20 0.45 p may acceptable mould die fabrication. optical microscope observations show that milled is anisotropic nature. Meanwhile, surface defects observed during included marks, grooves, microchips or debris cavities existence defects by thermal softening interaction between workpiece. This study showed thin layer plastic deformation formed immediate sub-surface workpiece, microhardness altered of 0.28 mrn beneath machined high pressure elevated heat. Nevertheless, all experienced excessive coating delamination by crack strip fiom substrate fiiction thermal cycling generated low toughness coating. It can concluded hard machining carried out AlSI mdtilayer TW/AlCrN tooling because been proven to produce productivity functional performance parts with respect