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Materials 2018, 11(1), 140; https://doi.org/10.3390/ma11010140

Investigation on the Effect of a Pre-Center Drill Hole and Tool Material on Thrust Force, Surface Roughness, and Cylindricity in the Drilling of Al7075

1
Department of Manufacturing and Production, University of Kashan, Qotb-e Ravandi Blvd., Kashan 8731753153, Iran
2
School of Engineering, Faculty of Science, Engineering and Built Environment, Deakin University, Victoria 3216, Australia
*
Author to whom correspondence should be addressed.
Received: 8 December 2017 / Revised: 4 January 2018 / Accepted: 6 January 2018 / Published: 16 January 2018
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Abstract

Drilling is one of the most useful metal cutting processes and is used in various applications, such as aerospace, electronics, and automotive. In traditional drilling methods, the thrust force, torque, tolerance, and tribology (surface roughness) are related to the cutting condition and tool geometry. In this paper, the effects of a pre-center drill hole, tool material, and drilling strategy (including continuous and non-continuous feed) on thrust force, surface roughness, and dimensional accuracy (cylindricity) have been investigated. The results show that using pre-center drill holes leads to a reduction of the engagement force and an improvement in the surface quality and cylindricity. Non-continuous drilling reduces the average thrust force and cylindricity value, and High Speed Steels HSS-Mo (high steel speed + 5–8% Mo) reduces the maximum quantity of cutting forces. Moreover, cylindricity is directly related to cutting temperature and is improved by using a non-continuous drilling strategy. View Full-Text
Keywords: drilling; thrust force; pre-center drill hole; surface roughness drilling; thrust force; pre-center drill hole; surface roughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ghasemi, A.H.; Khorasani, A.M.; Gibson, I. Investigation on the Effect of a Pre-Center Drill Hole and Tool Material on Thrust Force, Surface Roughness, and Cylindricity in the Drilling of Al7075. Materials 2018, 11, 140.

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