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General Information
Editor-in-chief
Prof. T. Hikmet Karakoc
Anadolu University, Faculty of Aeronautics and Astronautics, Turkey

IJET 2015 Vol.7(6): 445-448 ISSN: 1793-8236
DOI: 10.7763/IJET.2015.V7.834

Tool Wear of Titanium/Tungsten/Silicon/Aluminum- Based-Coated Solid Carbide Thread Milling Cutters in Thread Tapping of Chromium-Molybdenum Steel

Tadahiro Wada and Koji Iwamoto
Abstract—Helical milling method with thread milling cutters in thread tapping is effective against problems associated with tapping chips. In this study, chromium-molybdenum steel (ISO 34CrMo4, AISI 4137) was helical milled with two physical vapor deposition (PVD)-coated cemented carbide end thread milling cutters in order to determine effective tool materials for tapping chromium-molybdenum steel. The coating films used were (Ti, W) N/ (Ti, W, Si) N and commercial (Ti, Al) N coating films. The inner layer of the (Ti, W) N / (Ti, W, Si, Al) N coating system is (Ti, W) N coating film, and the outer layer is (Ti, W, Si, Al) N coating film. In order to identify an effective tool material for thread tapping of chromium-molybdenum steel, tool wear was experimentally investigated. The following results were obtained: (1) In thread tapping of chromium-molybdenum steel at a cutting speed of 0.67 m/s, the tool wear width of the (Ti, W) N /(Ti, W, Si, Al) N-coated tool was smaller than that of the (Ti, Al) N-coated tool. (2) The mean value of the friction coefficient of (Ti, W, Si, Al) N was 0.564, and that of (Ti, Al) N was 0.817. (3) (Ti, W) N / (Ti, W, Si, Al) N-coated cemented carbide was an effective tool material for thread tapping of chromium-molybdenum steel.

Index Terms—Tapping, helical milling, thread milling cutter, physical vapor deposition (PVD) coating system, tool wear.

Tadahiro Wada is with the Nara National College of Technology, 22 Yata-cho Yamatokoriyama, Nara 639-1080, Japan (e-mail: wada@mech.nara-k.ac.jp).
Koji Iwamoto is with the OSG Corporation, Japan.

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Cite: Tadahiro Wada and Koji Iwamoto, "Tool Wear of Titanium/Tungsten/Silicon/Aluminum- Based-Coated Solid Carbide Thread Milling Cutters in Thread Tapping of Chromium-Molybdenum Steel," International Journal of Engineering and Technology vol. 7, no. 6, pp. 445-448, 2015.

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