Effects of thrust force variation during the drilling of pure and chemically treated Kevlar based polymer composites

Anandraj Mohan Kumar; Rathinasamy Parameshwaran; Vijayan Krishnaraj; Rathanasamy Rajasekar

doi:10.3139/120.111392

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Effects of thrust force variation during the drilling of pure and chemically treated Kevlar based polymer composites

Anandraj Mohan Kumar , Rathinasamy Parameshwaran , Vijayan Krishnaraj und Rathanasamy Rajasekar

Veröffentlicht/Copyright: 30. August 2019

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Abstract

The influence of process parameters on thrust force during the drilling of pure and chemically treated Kevlar reinforced epoxy composites has been investigated. Surface treatment has been carried out to enhance the physical bonding between fiber and matrix. Four different drill bits were used for the investigation: standard twist, core, step cone and candle stick drill. Three speed and feed rates were used for the investigation. Our objective was to find the minimum thrust force during the drilling of pure and chemically treated Kevlar reinforced composite using four different drill bits. Optimization of drilling process parameters was performed using the Taguchi method of L₉ Orthogonal Array. We found that among the four drills core and candle stick drills produce a minimum thrust force compared with the twist and step cone drills. Thrust force values produced by a chemically treated specimen is lower than that of a pure composite specimen irrespective of the drill bits used. Chemically treated specimens of the core and candle stick varieties are suitable for lower thrust force and delamination free holes under specified experimental conditions. The significance of feed rate is more important for thrust force during the drilling of composite specimens irrespective of drills.

∗Correspondence Address, Anandraj Mohan Kumar, Department of Mechanical Engineering, Kongu Engineering College, Erode, 638060 India, E-mail: amohanmech2006@gmail.com

Anandraj Mohan Kumar, born in 1984, completed his BEng in Mechanical Engineering at the Erode Sengunthar Engineering College, Tamil Nadu, India, in 2006. He obtained his MEng degree in Computer Aided Design at the Government College of Engineering, Salem, Tamil Nadu, India in 2010. He is currently working as Assistant Professor in the Department of Mechanical Engineering at Kongu Engineering College, Erode, Tamil Nadu, India.

Dr. Rathinasamy Parameshwaran, born in 1976, obtained his PhD degree at Kongu Engineering College, Perundurai, in Performance Management in 2009. He gained his Master's degree in Industrial Engineering at Regional Engineering College, Trichy, Tamil Nadu, India. He is working as Head and Professor in the Department of Mechatronics Engineering at Kongu Engineering College, Erode, India

Dr. Vijayan Krishnaraj obtained his BEng, MEng and PhD in the field of drilling composites in 1994, 1999 and 2007, respectively. He also completed his post doc in France in 2008 and 2009. Currently, he is working as Associate Professor in the Department of Production Engineering, PSG College of Technology, Coimbatore, Tamil Nadu, India.

Dr. Rathanasamy Rajasekar, born in 1982, obtained his MSc and PhD degrees at the Indian Institute of Technology, Kharagpur, in Materials Science in 2008 and 2011, respectively. He gained post-doctoral research experience in the Department of Polymer & Nano Engineering at Chonbuk National University, South Korea in 2011 and 2012. Since 2012, he has been working as Associate Professor in the Department of Mechanical Engineering at Kongu Engineering College, Erode, India.

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Published Online: 2019-08-30

Published in Print: 2019-08-30

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https://doi.org/10.3139/120.111392