CFRP Drilling with Brazed Diamond Core Drill

2011 ◽  
Vol 175 ◽  
pp. 27-32 ◽  
Author(s):  
Juan Mu ◽  
Jiu Hua Xu ◽  
Yan Chen ◽  
Yu Can Fu
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Drilling Quality ◽  
Near Net Shape ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Despite the facts that carbon fiber reinforced plastics (CFRP) components are mostly produced near net shape, machining, especially drilling is often required in order to bring the component into dimensional requirements and prepare it for assembly. Rapid drill wear and serious machining defects are the key problems in CFRP drilling, and employing proper drill is an effective way to solve these problems. In this paper, tests of the brazed diamond core drill are presented and the related issues, such as the thrust force, the drilling quality and the drill wear are studied.

Studies on Disfigurement-Fee Technology of Drilling Carbon Fiber Reinforced Plastics

2007 ◽  
Vol 24-25 ◽  
pp. 125-132
Author(s):  
Yong Qi Wang ◽  
Yong Jie Bao ◽  
Hang Gao
Keyword(s):  
Carbon Fiber ◽  
Drilling Process ◽  
Fiber Reinforced ◽  
Drilling Force ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Drilling Quality ◽  
New Type ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Based on the analysis of various disfigurements of carbon fiber reinforced plastics formed in drilling process, the formation model of disfigurement is built up, and analysis results shows that the main reason of disfigurement is the exceeding cutting force. By focusing on these problems, new-type drill—super-hard electroplated abrasive drill is developed, and some experiments were carried out. Compared with the traditional sintered-carbide drill in drilling, the super-hard electroplated abrasive drill has lower drilling force, better drilling quality, higher machining efficiency, and longer life-span. A conclusion that super-hard electroplated drill is more suitable for drilling CFRP is gained.

Study on the 3D Pattern of Hole Wall in Drilling Carbon Fiber Reinforced Plastics Using Orthogonal Experiment

2014 ◽  
Vol 902 ◽  
pp. 58-62
Author(s):  
Xue Lin Li ◽  
Gui Yu Li ◽  
Xing Quan Li
Keyword(s):  
Carbon Fiber ◽  
Orthogonal Experiment ◽  
Spindle Speed ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Hole Wall ◽  
Drilling Quality ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

The drilling damage forms of hole wall is presented and the reasons for drilling quality are analyzed in drilling carbon fiber reinforced plastics. Based on the study of experiments, the relationship between the drilling damage and the drilling parameters are obtained. The results indicate that the drilling hole wall forms drawn fiber and fallen off fiber bundle more easily and the surface roughness of hole wall becomes worse with the increase of the spindle speed, and the final drilling surface presents obvious anisotropy. In order to obtain good drilling quality, lower spindle speed should be selected on the premise of lower feed rate.

Experimental Analysis on Delamination Damage by Acoustic Emission in High Speed Drilling of Carbon Fiber Reinforced Plastics

2013 ◽  
Vol 589-590 ◽  
pp. 287-292 ◽  
Author(s):  
Xiao Jiang Cai ◽  
Sheng Qin ◽  
Qing Long An ◽  
Hong Zhou Zhang ◽  
Shu Han ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Thrust Force ◽  
Fiber Reinforced ◽  
Great Resistance ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Delamination Damage

Carbon fiber reinforced plastics (CFRP) has increasing applications in aerospace and other fields, due to low density, high strength, high stiffness, great resistance to corrosion, etc. Although, delamination damages in drilling holes for assembly influence the final characteristics of CFRP components. This paper presents an experimental investigation to analyze delamination damage, in which acoustic emission and thrust force are monitored during drilling CFRP laminates to clarify the relationship between AE signals and delamination damages. The results show that delamination damage has close correlation with thrust force and acoustic emission energy. AE root mean square (rms) is recommended to be selected as AE signal parameter. Abrupt peak feature of AE rms can be used as a dependable trigger for delamination monitoring. The number of abrupt pulses of AE rms can be counted online to predict the degree of delamination damages, based on which delaminations can be monitored and controlled online.

Experimental Investigation on the Tilt Helical Milling of Carbon Fiber Reinforced Plastics (CFRP)

2018 ◽  
Vol 792 ◽  
pp. 173-178
Author(s):  
Qiang Wang ◽  
Yong Bo Wu ◽  
Dong Lu ◽  
Teruo Bitoh ◽  
Ming Feng
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
New Method ◽  
Helical Milling ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Delamination Factor ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced plastics (CFRP) has been widely used in various aircraft structural components. However, it is difficult for conventional methods such as drilling and helical milling to meet the requirements on high quality and efficient holes creation. Hence a so-called tilt helical milling (THM) method has been proposed. This new method is performed by replacing the revolving motion of the tool in conventional helical milling (CHM) with a conical pendulum motion, in which the tool axis is tilted towards the hole axis at a certain angle. As a step toward the establishment of the new method, in this work, the fundamental drilling characteristics of CFRP by the THM is elucidated by experimentally investigating the effects of tilt angle on thrust force and delamination factor. The obtained experimental results demonstrated that thrust force and delamination factor can be reduced with THM technique. In addition, THM can achieve better hole surface finish than CHM.

Parametric investigation of rotary ultrasonic drilling of carbon fiber reinforced plastics

2017 ◽  
Vol 232 (5) ◽  
pp. 540-554 ◽  
Author(s):  
Saeid Amini ◽  
Mohammad Baraheni ◽  
Alireza Mardiha
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Machining Parameters ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Ultrasonic Drilling ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Rotary Ultrasonic Drilling

Carbon fiber reinforced plastics are used in various industrial applications for their excellent properties. Rotary ultrasonic drilling is the new machining process used to drill holes on fiber-reinforced plastics and has been attracting increased attention in recent years. Dimensional tolerances are very important in machining of carbon fiber reinforced plastics. Additionally, diamond core drills are simultaneously drilling and grinding fiber reinforced plastics. This paper aims to investigate thrust force and dimensional tolerances including roundness and cylindricity in rotary ultrasonic drilling of carbon fiber reinforced plastics using diamond core drill. To this end, a proper ultrasonic system for a core drill in ABAQUS is designed and fabricated. Thrust force in rotary ultrasonic drilling when compared to conventional drilling reduced by up to 30%. Besides, roundness and cylindricity decreased by up to 80% and 72%, respectively. Afterwards, analysis of variance demonstrated that vibration is more influential than other machining parameters in order to improve the hole accuracy. That is, obtained exponential regression models predict roundness and cylindricity through machining parameters with high accuracy. Feed rate of 30 mm/min and spindle speed of 1400 r/min by exerting vibration on the tool is considered to be the optimized condition.

INCREASING SENSITIVITY OF EDDY CURRENT NON-DESTRUCTIVE TESTING OF DELAMINATION IN CARBON-FIBER REINFORCED PLASTICS

2021 ◽  
pp. 28-37
Author(s):  
P. N. Shkatov ◽  
G. A. Didin ◽  
A. A. Ermolaev
Keyword(s):  
Carbon Fiber ◽  
Eddy Current ◽  
Calculation Model ◽  
Fiber Reinforced ◽  
Destructive Testing ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
The Difference

The paper is concerned with increasing sensitivity of eddy current nondestructive testing of most dangerous delamination in carbon-fiber reinforced plastics (CFRP). Increased sensitivity is achieved by separate registration and comparison of eddy current signals obtained from a set of stratifications of carbon fibers with the same orientation. The separation of eddy current signals is possible due to pronounced anisotropy of the electrical conductivity of the layers dominant in the direction of the fibers of the corresponding layer. Eddy-current signals are registered by eddy current probes with maximum sensitivity in a given angular direction. Prior to the scan eddy current signals of the probe are leveled on a defect-free area. The influence of the working gap on the difference between the eddy current signals of the probe is suppressed by normalizing it according to one of the signals. The analysis of the registered signals from delamination has been performed using an approximate calculation model. The reliability of the obtained results has been confirmed by comparison with experimental results and calculations using the finite element method.

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