Low-frequency axial vibration drilling of Al2O3/GFRP laminated composite plate by diamond trepanning bit

• Published in: Composite structures Vol. 245; p. 112374
• Main Authors: Zheng, Lei, Qin, Peng, Lv, Dongming, Wei, Wendong, Dong, Xianglong, Park, Sanghu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-08-2020
• Subjects: Al2O3/GFRP laminated composite plate; Diamond trepanning bit; Drilling; Low-frequency axial vibration; Drilling; Al2O3/GFRP laminated composite plate; Diamond trepanning bit; Low-frequency axial vibration
• ISSN: 0263-8223; 1879-1085
• DOI: 10.1016/j.compstruct.2020.112374

In armor protection fields, various ceramics/FRP laminated composite plates are increasingly applied because of superior comprehensive protection performances. A great deal of hole drilling operations are required for assembly and connection. However, only a few literatures are reported on the drilling technologies of ceramics/FRP laminated composites. In this study, the constant feed rate drilling of the Al2O3/GFRP laminated composite plate has been researched through the low-frequency vibration drilling along with a thin-wall diamond trepanning bit. A kinematic model for low-frequency axial vibration trepanning drilling has been established and used for analyzing the machining characteristics of the pulse cutting. To reveal the drilling effects of the Al2O3/GFRP laminated composites under the conventional drilling and low-frequency axial vibration drilling, the comparison experiments have been carried out, and then the axial force, hole wall roughness and hole exit defects under the above two drilling methods have been analyzed deeply. The results show that compared with the conventional drilling, the low-frequency axial vibration drilling can achieve the constant feed rate drilling of the Al2O3/GFRP laminated composites with better drilling quality.