Abstract:Microcosmic and macroscopic form of CFRP holes drilled by new PCD tool were observed in this paper. Location and distribution of burr and fiber direction of burr were analyzed, and formation mechanism of burr of CFRP hole exit is studied tentatively. The methods of inhibit the formation of burr formation were put forward from the design principles of the tool geometry parameters.
“…Furthermore, Ji et al have also emphasized the significant influence of the rise of outlet temperature on burr formation. 57 Figure 10.Burr formation.Figure 11.Burr height in µm.…”
Section: Resultsmentioning
confidence: 99%
“…Furthermore, Ji et al have also emphasized the significant influence of the rise of outlet temperature on burr formation. 57 During the drilling process, the cutting tool engages with the bundles of aramid fibers within the Nomex®. These fiber bundles are subject to bending under the applied cutting forces, resulting in elastic deformation of the material.…”
Section: Delamination and Burr Formationmentioning
This article presents a comprehensive experimental investigation into the drilling behavior of Nomex®, a type of aramid fiber. The study specifically examines the impact of various cutting parameters and drill bit types on drilling outcomes. While Nomex® offers many advantages, difficult chip evacuation during drilling of aramid fiber composites can lead to surface defects and delamination. The research aims to explore how drilling parameters—such as spindle speed, feed rate—and four distinct drill bit types affect drilling performance. The analysis encompasses factors such as thrust force, torque, and surface roughness, studied under different drilling conditions and with various drill bit types. Moreover, the research assesses peeling and push-out delamination factors to gain insights into drill bit and coating characteristics. An examination of burr and chipping further enhances the comprehension of drilling performance. To determine the most effective drilling conditions, the study employs multi-response optimization. The optimal drilling performance is achieved with a combination of a 0.1 mm/rev feed rate, 1402.82 r/min spindle speed, and HSS-TiN drill type. This configuration successfully integrates responses, resulting in a composite desirability value of 0.95.
“…Furthermore, Ji et al have also emphasized the significant influence of the rise of outlet temperature on burr formation. 57 Figure 10.Burr formation.Figure 11.Burr height in µm.…”
Section: Resultsmentioning
confidence: 99%
“…Furthermore, Ji et al have also emphasized the significant influence of the rise of outlet temperature on burr formation. 57 During the drilling process, the cutting tool engages with the bundles of aramid fibers within the Nomex®. These fiber bundles are subject to bending under the applied cutting forces, resulting in elastic deformation of the material.…”
Section: Delamination and Burr Formationmentioning
This article presents a comprehensive experimental investigation into the drilling behavior of Nomex®, a type of aramid fiber. The study specifically examines the impact of various cutting parameters and drill bit types on drilling outcomes. While Nomex® offers many advantages, difficult chip evacuation during drilling of aramid fiber composites can lead to surface defects and delamination. The research aims to explore how drilling parameters—such as spindle speed, feed rate—and four distinct drill bit types affect drilling performance. The analysis encompasses factors such as thrust force, torque, and surface roughness, studied under different drilling conditions and with various drill bit types. Moreover, the research assesses peeling and push-out delamination factors to gain insights into drill bit and coating characteristics. An examination of burr and chipping further enhances the comprehension of drilling performance. To determine the most effective drilling conditions, the study employs multi-response optimization. The optimal drilling performance is achieved with a combination of a 0.1 mm/rev feed rate, 1402.82 r/min spindle speed, and HSS-TiN drill type. This configuration successfully integrates responses, resulting in a composite desirability value of 0.95.
“…6). Mechanism of EF-burr was that PCD cutting edge blunting [14], and mechanism of LA-burr was caused by axial load and workpicee material and so on. Decrease of cutting edge sharpness is main reason of one type generated, and vibrating of tool-workpiece system is second one.…”
Section: Results Of Experiments and Discussionmentioning
This paper presents a design idea of PCD tool drilling CFRP and analysis of experiment of two types PCD tools machining CFRP. Firstly, parameters of PCD drill including cutting edge type, clearance angle and two point angles were improved by the mean of surveying variation of axial load values and quality of CFRP hole exit. Secondly, two types of burrs were defined from aspects of burr generated mechanism by observing plenty of burr pictures. Lastly, making use ofMATLABsoftware, function between axial load and hole numbers were ensured by data fitting in tool life analysis.
“…Moreover, other researchers also found that large burr defects are formatted by the tensile force during the cutting process, and few burr defects are found when the fiber is in a shear stress state. Ji et al [45] reported that the angle between the cutting direction and the fiber orientation plays an important role in burr formation-the vibration of workpiece and the rise of outlet temperature are the other reasons-and, secondly, the vibration of the workpiece and the increase in the outlet temperature are another reason.…”
As contemporary emerging materials, fiber-reinforced plastics/polymers (FRP) are widely used in aerospace automotive industries and in other fields due to their high strength-to-weight ratio, high stiffness-to-weight ratio, high corrosion resistance, low thermal expansion and other properties. Drilling is the most frequently used process in industrial operation for polymer composite laminates, owing to the need for joining structures. However, it is a great challenge for operators to drill holes in FRP materials, due to the non-homogenous and anisotropic properties of fibers. Various damages, such as delamination, hole shrinkage, and burr and tool wear, occur due to the heterogeneous and anisotropic nature of composite laminates. Therefore, in this study, carbon fiber reinforced polymer (CFRP)/aramid fiber reinforced polymer (AFRP) hybrid composites (C-AFRP) were successfully synthesized, and their drilling characteristics, including burr generation and tool wear, were also mainly investigated. The drilling characteristics of CFRP and C-AFRP were compared and analyzed for the first time under the same operating conditions (cutting tool, spindle speed, feed rate). The experimental results demonstrated that C-AFRP had higher tensile strength and good drilling characteristics (low thrust and less tool wear) compared with CFRP. As a lightweight and high-strength structural material, C-AFRP hybrid composites have great potential applications in the automobile and aerospace industries after the slight processing of burrs generated during drilling.
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