Raj Mohan Kumar Anand, Rathanasamy Rajasekar, Rathinasamy Parameshwaran, Kumar P Manoj, Periyasamy Sureshkumar, Alahmadi Ahmad Aziz, Alwetaishi Mamdooh, Rajendran Parvathy, Lee It Ee
School of Building and Mechanical Sciences, Kongu Engineering College, Perundurai, Tamil Nadu, 638060, India.
Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Coimbatore, Tamil Nadu, 641407, India.
Sci Rep. 2025 May 2;15(1):15382. doi: 10.1038/s41598-025-90668-y.
In this study, thrust force generation during drilling in natural fiber-reinforced epoxy has been investigated. Three natural fibers Abaca (A), Hemp (H) and Jute (J) have been utilized. Four different point angles of the twisted drill tools have been employed: 90°, 100°, 105° and 118°. The sequence of natural fiber-based specimens prepared for the studies as follows: A/H/A/H and H/J/H/J. The objective of this study is to find the drilling process parameters at lower thrust force. Also find the percentage of contribution of the drilling process parameters on the thrust force. Few authors has studied the drilling analysis using angle variation in the twisted drill bit however, no researches has been found in the drilling study of Hemp, Abaca and Jute by different angled twist drill bit. The result indicates that at 0.05 mm/rev feed rate and 3000 rpm spindle speed generated minimum thrust force of 4.6 N on abaca and hemp-based composites using 90°-point angle of the twisted drill bit. At 0.05 mm/rev, 3000 rpm and 90°-point angle of drill bit, produced minimum thrust force of 3.1 N on Hemp and Jute fiber-based composite. Thermal imager has been used to monitor temperature variation during the drilling of composite specimens. Defects in the specimen was identified by using scanning electron microscopic and microscopic images. The analysis of variance of the thrust force generated during drilling of the A/H/A/H and H/J/H/J based composite materials has performed using Minitab 21 software.
在本研究中，对天然纤维增强环氧树脂钻孔过程中的推力产生情况进行了研究。使用了三种天然纤维：马尼拉麻（A）、大麻（H）和黄麻（J）。采用了四种不同顶角的麻花钻刀具：90°、100°、105°和118°。为研究制备的天然纤维基试样顺序如下：A/H/A/H和H/J/H/J。本研究的目的是找出较低推力下的钻孔工艺参数。同时找出钻孔工艺参数对推力的贡献率。很少有作者使用麻花钻头角度变化进行钻孔分析，然而，尚未发现关于使用不同角度麻花钻头对大麻、马尼拉麻和黄麻进行钻孔研究的报道。结果表明，在0.05 mm/rev的进给速度和3000 rpm的主轴转速下，使用90°顶角的麻花钻头在马尼拉麻和大麻基复合材料上产生的最小推力为4.6 N。在0.05 mm/rev、3000 rpm和90°钻头顶角条件下，在大麻和黄麻纤维基复合材料上产生的最小推力为3.1 N。使用热成像仪监测复合材料试样钻孔过程中的温度变化。通过扫描电子显微镜和微观图像识别试样中的缺陷。使用Minitab 21软件对A/H/A/H和H/J/H/J基复合材料钻孔过程中产生的推力进行了方差分析。
