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Effects of High-Pressure Coolant Supply on Tool Wear and Axial Hole Deviation in through Hole Drilling ASTM 304 Using Twist Deep Hole Drill

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Abstract:

In deep-hole drilling using long drills (L/D >= 40), chip evacuation becomes poor, and step-feed drilling is therefore employed, resulting in reduced machining efficiency. Although the use of high-pressure coolant (HPC) machining technology is expected to improve chip evacuation as well as reduce tool damage, few studies have investigated the effects of applying a high-pressure coolant to deep-hole drilling with long drills, either domestically or internationally. Therefore, this study aimed to propose and experimentally demonstrate the combined use of a high-pressure coolant during drilling in order to achieve high-efficiency and high-precision deep-hole machining (L/D = 40) using a 5-mm-diameter drill. The results that (1) at a cutting speed of 60 [m/min], the flank wear on both cutting edges was significantly greater at a coolant pressure of 0.2 [MPa] than at 20 [MPa], (2) although the axial hole deviation varied with the number of holes, it was smaller at a cutting speed of 90 [m/min] than that at 80 [m/min], and so on, were obtained.

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Periodical:

Key Engineering Materials (Volume 1058)

Pages:

163-171

DOI:

https://doi.org/10.4028/p-lX1B9l

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Online since:

June 2026

Authors:

Tadahiro Wada, Kazuki Hiro*, Kenji Kodama, Yusuke Morigo

Keywords:

ASTM 304, Axial Hole Deviation, Deep Hole Drilling, High-Pressure Coolant Supply

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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