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.
[PDF]
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.
