COMPARISON OF DEEP HOLE DRILLING PERFORMANCE ON SUS 304 USING ROTATING AND NON-ROTATING DRILL BITS UNDER REDUCED QUANTITY NANO-LUBRICATION CONDITIONS

Mai Thị Thu Hà; Nguyễn Văn Dự; Hồ Ký Thanh

doi:10.34238/tnu-jst.13428

COMPARISON OF DEEP HOLE DRILLING PERFORMANCE ON SUS 304 USING ROTATING AND NON-ROTATING DRILL BITS UNDER REDUCED QUANTITY NANO-LUBRICATION CONDITIONS

About this article

Received: 16/08/25 Revised: 24/09/25 Published: 24/09/25

Authors

1. Mai Thi Thu Ha, Thai Nguyen High School for Gifted Students
2. Nguyen Van Du, TNU - University of Technology
3. Ho Ky Thanh , TNU - University of Technology

Abstract

This paper presents the experimental investigation comparing the performance of deep hole drilling on SUS 304 stainless steel using two configurations: rotating drill and stationary drill. The experiments were conducted under reduced quantity lubrication conditions, with a coolant flow rate of 0.25 L/min and a pump pressure of 1.5 bar. The nanofluid coolant was prepared through a two-step process: first, graphene nanoparticles were dispersed into an emulsion using ultrasonic agitation; then, the resulting mixture was diluted with tap water to obtain the final working fluid. The results indicate that the nanofluid coolant enhances chip evacuation efficiency, thereby improving the stability of the drilling process. Comparative analysis between the two configurations reveals that the rotating drill setup provides better chip breakability, generating fragmented chips that facilitate smoother evacuation. Furthermore, this configuration yields lower and more stable thrust forces, smaller burr height at the hole exit, and extended tool life.

Keywords

Deep hole drilling; Chip morphology; Thrust force; Hole diameter; Burr

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DOI: https://doi.org/10.34238/tnu-jst.13428

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