Optimized selection of process parameters based on reasonable control of axial force and hole-exit temperature in drilli
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ORIGINAL ARTICLE
Optimized selection of process parameters based on reasonable control of axial force and hole-exit temperature in drilling of CFRP Boyu Zhang 1 & Fuji Wang 1
&
Xiaoda Wang 1 & Yue Li 1 & Qi Wang 1
Received: 18 April 2020 / Accepted: 31 July 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Drilling is a key link of manufacturing carbon fiber-reinforced polymer (CFRP) components. However, due to CFRP’s anisotropy and heterogeneity, effects of drilling induced axial force and hole-exit temperature are much more complicated than conventional metals, which always results in undesirable surface damages at hole exit hindering the engineering application of CFRP. Since the axial force and the hole-exit temperature are highly correlated to process parameters in drilling of CFRP, for effectively overcoming such difficulties, this study focuses on optimized selection of process parameters. The suitable ranges of the axial force and the hole-exit temperature are figured out, upon the specific analysis on the combined effects of the axial force and the hole-exit temperature on the formation of hole-exit surface damages. With that, through establishing the relations between the axial force, the hole-exit temperature, and the drilling parameters, the optimized drilling parameters are finally given. By experimental verifications, it is found that the optimized drilling parameters can control the axial force and the hole-exit temperature within the suitable ranges, and thereby effectively suppress the hole-exit surface damages in drilling of CFRP. The findings of this study will be helpful to further improve the drilling qualities of CFRP. Keywords CFRP . Drilling . Surface damages . Axial forces . Hole-exit temperature
1 Introduction Due to its outstanding performance advantages such as high specific strength and strong designability, carbon fiberreinforced polymer (CFRP) has become a worldwide popular structural material in the aviation industry [1, 2]. For giving full play to its advantage of designability, the CFRP
* Fuji Wang [email protected] Boyu Zhang [email protected] Xiaoda Wang [email protected] Yue Li [email protected] Qi Wang [email protected] 1
Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Department of Mechanical Engineering, Dalian University of Technology, Dalian, China
components are always simultaneously designed and manufactured through near-net forming, but in order to meet assembly requirements, drilling [3] is always inevitable and in great demand. However, due to the heterogeneity and anisotropy of CFRP [4], in the drilling process, undesirable machining damages occur frequently. Particularly at the hole exit, because of the weak support from uncut materials and the weak interlaminar strength of CFRP, the damages like delamination and surface damages (generally referring to burrs and cracking) [3, 5] are often more serious. Unfortunately, the hole exit is always the most important joint p
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