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Threading Performance of Different Coatings for High Speed Steel Tapping

TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Científico, Parque Científico y Tecnológico de Gipuzkoa, E20009 Donostia-San Sebastián, Spain
Aeronautics Advanced Manufacturing Center CFAA, E48170 Zamudio, Spain
Department of Mechanical Engineering, University of the Basque Country (UPV/EHU), E48013 Bilbao, Spain
Author to whom correspondence should be addressed.
Coatings 2020, 10(5), 464;
Received: 21 April 2020 / Revised: 6 May 2020 / Accepted: 7 May 2020 / Published: 10 May 2020
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 × 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. View Full-Text
Keywords: tapping; tap coatings; flank wear; threading torque tapping; tap coatings; flank wear; threading torque
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MDPI and ACS Style

Gil Del Val, A.; Veiga, F.; Pereira, O.; Lopez De Lacalle, L.N. Threading Performance of Different Coatings for High Speed Steel Tapping. Coatings 2020, 10, 464.

AMA Style

Gil Del Val A, Veiga F, Pereira O, Lopez De Lacalle LN. Threading Performance of Different Coatings for High Speed Steel Tapping. Coatings. 2020; 10(5):464.

Chicago/Turabian Style

Gil Del Val, Alain; Veiga, Fernando; Pereira, Octavio; Lopez De Lacalle, Luis N. 2020. "Threading Performance of Different Coatings for High Speed Steel Tapping" Coatings 10, no. 5: 464.

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