Article
Engineering, Manufacturing
Liming Shu, Shihao Li, Zhenglong Fang, Toru Kizaki, Katsuyo Kimura, Giichi Arai, Koichi Arai, Naohiko Sugita
Summary: The study altered the drilling approach for CFRP from crushing/compression fracture to shear cutting to suppress thermomechanical loads, achieving a significant improvement in performance. The dedicated drill bit outperformed the conventional drill bit in terms of thrust force, temperature elevation, burr, and exit-delamination, highlighting the effectiveness of the new design approach.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Byeong-chan Kwon, Dong-gil Ahn, Ji-yong Hwang, Kil-Dong Sung, Joonyoung Koo, Sunglim Ko
Summary: In order to increase the tool life for CFRP machining, this study applied diamond coatings via CVD and conducted experiments to find the optimal coating thickness. The best performance was achieved by controlling CH4 concentration for adhesion force and coating time for the thickness of layer, leading to 2.5 times longer lifetime based on flank wear and 2.2 times longer based on the delamination factor compared to the worst tool.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Manufacturing
Guoqing Chen, Shujing Wu, Dazhong Wang, Wenqing Dai
Summary: As research advances, titanium alloy materials have found broader applications in aerospace and other fields. However, issues such as chip winding and tool wear often occur during the machining process. In this study, the main cutting-edge structure of the three-step drill was modified to improve chip breakage. The analysis of drilling forces and experiments confirmed the feasibility of three-step drilling to improve processing quality. The results demonstrate that the improved drill exhibits better chip breaking performance, lower thrust force, and enhanced machining performance compared to twist drills.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Engineering, Marine
Mengke Wang, Wenbo He, Minqi Wang, Jine Cao, Pinlu Cao
Summary: Air reverse circulation drilling is a promising method for ice drilling due to its high mechanical penetration rate and lack of pollution. The structure of the drill bit and the presence of ice core have significant impacts on the effect of air reverse circulation.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Xinyi Qiu, Pengnan Li, Changping Li, Qiulin Niu, Shujian Li, Tae Jo Ko, Lingyan Tang
Summary: This study investigates the variation patterns of tool wear and the causes of drill failure in CFRP drilling through drilling experiments and the comparison of evaluation indexes, and concludes that the reverse edge compound drill is suitable for drilling CFRP.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Usama A. Khashaba, Mohamed S. Abd-Elwahed, Mohamed A. Eltaher, Ismail Najjar, Ammar Melaibari, Khaled I. Ahmed
Summary: This study investigates the effects of drilling factors on the thermal-mechanical properties and delamination of glass fiber reinforced polymer (GFRP) experimentally. The results demonstrate significant relationships between drilling factors and responses, with feed having a greater impact on thrust force compared to speed. All machining parameters significantly affect the measured temperature, with laminate thickness making the largest contribution.
Article
Engineering, Manufacturing
S. Samsudeensadham, V Krishnaraj
Summary: Carbon fiber reinforced plastic/Ti-6Al-4V stacks are commonly used in aircraft structures due to their high strength-to-weight ratio. This experimental study investigated the use of a grooved drill tool to reduce damage and improve drilling efficiency. The results showed that the grooved drill tool significantly decreased delamination and burr formation compared to the standard tool.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Textiles
A. R. Ngah, Suhad D. Salman, Z. Leman, S. M. Sapuan, M. F. M. Alkbir, Fatihhi Januddi
Summary: Drilling is a process of material removal, but problems may arise when drilling composite materials due to delamination. This study examined the effect of factors such as feed rate, spindle speed, drill bit type, and geometry on delamination during the drilling process, and used Taguchi methods to find the optimal parameters.Minimizing delamination was achieved when using a feed rate of 0.05 mm/rev and a spindle speed of 700r/min with both types of drill bits.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Engineering, Manufacturing
Xin-Yi Qiu, Peng-Nan Li, Ling-yan Tang, Chang -ping Li, Qiu-Lin Niu, Shu-Jian Li, Si-wen Tang, Tae Jo Ko
Summary: This study analyzes the influence of feed rate on exit delamination and tear in carbon fiber reinforced polymer (CFRP) pipe, and determines the optimal feed rate to be 0.04 mm/r.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Automation & Control Systems
Qi Wang, Dazhong Wang, Yu Fang
Summary: This paper investigates the difficult-to-machine properties and tool wear issues of nickel-based high-temperature alloy Inconel 718. By comparing conventional drilling and ultrasonic-assisted drilling, it is found that ultrasonic-assisted drilling can reduce machining temperature and improve chip morphology.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chen Chen, Qing Zhao, Aixu Wang, Jing Zhang, Qing Qu, Zhanli Shi
Summary: The tool structure is an important factor affecting the damage of CFRP/Ti stacks machining, and finite element simulation can effectively overcome the limitations of experiments in revealing the impact of tool structure on the formation process of stacks hole damage. In this study, a numerical simulation model is established to investigate the relationship between step drill structure and the formation process of CFRP/Ti stacks hole damage. The results show that step drill with a ratio of primary drill bit diameter to secondary drill bit diameter (kd) of 0.6 is suitable for drilling of CFRP/Ti stacks.
Article
Engineering, Industrial
Fu-ji Wang, Meng Zhao, Rao Fu, Jian-bo Yan, Shen Qiu, Jia-xuan Hao
Summary: This article introduces a novel structure to effectively break aluminum chips during drilling, reducing damage and improving drilling quality in CFRP/Al stack structures. Comparative experiments confirm the effectiveness of this structure, offering a new approach for structural design in the aerospace industry.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
T. V. Rajamurugan, C. Rajaganapathy, S. P. Jani, Claris Snigdha Gurram, Haiter Lenin Allasi, Samson Zerihun Damtew
Summary: Composite materials are replacing conventional materials and alloys due to their weight reduction. Biodegradable fiber-reinforced composites are attracting researchers because they are easily available and cost-effective. This study aims to minimize delamination during drilling of coir fiber-reinforced composites by using a multifaceted drill bit.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Automation & Control Systems
ZiQiang Zhang, Feng Jiao, YuanXiao Li, Ying Niu, JingLin Tong
Summary: This paper investigates the machining performance of longitudinal-torsional ultrasonic-assisted core drilling in carbon fiber-reinforced plastics. The results show that this method significantly reduces cutting force, suppresses delamination, and improves hole quality.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Liying Fan, Dazhong Wang
Summary: This study aims to inhibit delamination of Al/Ti laminated materials and improve chip fracture ability by changing the second point angle of the double cone drill. Experimental results show that the double cone drill can reduce drilling force, resulting in less delamination damage and easier chip breakage.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
