Threading Performance of Different Coatings for High Speed Steel Tapping

被引:18
作者
Gil Del Val, Alain [1 ]
Veiga, Fernando [1 ]
Pereira, Octavio [2 ]
Lopez De Lacalle, Luis Norberto [2 ,3 ]
机构
[1] TECNALIA, Basque Res & Technol Alliance BRTA, Parque Cient, Parque Cient & Tecnol Gipuzkoa, E-20009 Donostia San Sebastian, Spain
[2] Aeronaut Adv Mfg Ctr CFAA, E-48170 Zamudio, Spain
[3] Univ Basque Country, Dept Mech Engn, UPV EHU, E-48013 Bilbao, Spain
关键词
tapping; tap coatings; flank wear; threading torque; PVD COATINGS; TOOLS; IRON;
D O I
10.3390/coatings10050464
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Threading holes using tapping tools is a widely used machining operation in the industry. This manufacturing process involves a great tool immersion in the part, which involves both friction and cutting. This makes the use of coatings critical to improving tool life. Four coatings are used based on Physical vapor deposition (PVD) technology-TiN, TiCN, TiAlN and TiAlN+WC/C are compared to uncoated tool performance. The effect of various coatings on the life of M12 x 1.5 tapping tools during threading of through holes 20 mm deep, in GG25 casting plates, dry and applying cutting speed of 50 m/min. The end-of-life criterion has been established based on a cutting torque of 16 N-m. Taking the uncoated tap as a basis for comparison, it is observed that coatings based on PVD technologies increase tool life doubling in the most advantageous case with the TiAlN coating. PVD type coatings provide better protection to wear at cylindrical area of the tool, where the thread profile is finished, than uncoated taps. The teeth located in the cone-cylinder transition zone of the taps suffer the most wear regardless of the coating. However, taps coated with TiAlN+WC/C wear level values is lowest of all the coatings tested, which indicates a strong reinforcement in these teeth.
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页数:19
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