Novel drill structure for damage reduction in drilling CFRP composites

Zhang, Jia; Fu, Rao; Niu, Bin; Qian, Baowei; Bai, Yu; Wang, Fuji

doi:10.1016/j.ijmachtools.2016.08.006

Cited by 197 publications

(58 citation statements)

References 28 publications

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“…Compared with the straight drill, the drill with left hand helix produces higher axial force F drill‐a and more serious Mode I fracture, thus aggravates the delamination at the exit. Additionally, when the drill with right hand helix is applied, the uncut fibers at the exit are pushed toward the entry in which the hole wall supports the uncut fibers, so it is more difficult for delamination at the exit to propagate .…”

Section: Resultsmentioning

confidence: 99%

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Effect of drill flute direction on delamination at the exit in drilling Carbon Fiber Reinforced Plastic

et al. 2018

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Drilling holes on Carbon Fiber Reinforced Plastic components is inevitable for mechanical assembly in the aerospace field. Delamination at the exit frequently occurs and substantially reduces the service life of components. Drill flute direction is one of the main factors affecting delamination at the exit. The article aims to study the effect of drill flute direction on delamination and further to guide the suitable choice of drill flute direction. Comparative experiments are performed in drilling Carbon Fiber Reinforced Plastic for the drills with different drill flute directions, when a small cutting edge radius is involved. Based on the experimental results, the effects of drill flute direction on the thrust force, force state of the uncut fibers at the exit, and delamination propagation at the exit are obtained. Meanwhile, the phenomenon that delamination at the exit varies with the drill flute direction significantly is explained from aspects of thrust force and force state of the uncut fibers at the exit. The drill with left hand helix owns the most serious delamination at the exit among the tested drills because of its high thrust force and serious tearing function for the uncut fibers at the exit. POLYM. COMPOS., 40:E1434–E1440, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

“…Delamination at the exit has been widely evaluated by applying a one‐dimensional delamination factor F d , which is defined as the ratio of the maximum diameter D max of the delamination area to the nominal diameter D norm of hole, as indicated in Fig. .…”

Section: Resultsmentioning

confidence: 99%

Effect of drill flute direction on delamination at the exit in drilling Carbon Fiber Reinforced Plastic

et al. 2018

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“…According to Jia et al [46], minor cutting edge with the right helical angle was believed to perform upward cutting during downward drilling process with the drill-exit materials being supported from the inner materials of the hole. This in theory facilitates the effective cut of any unremoved materials.…”

Section: Temperature Characteristics After P-iiimentioning

confidence: 99%

Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography

Zhang

Wang

et al. 2018

International Journal of Machine Tools and Manufacture

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A B S T R A C TThis paper presents a comprehensive study on the complex drill-exit temperature characteristics in the drilling of unidirectional (UD) and multidirectional (MD) CFRPs using a state-of-art microscopy infrared imaging system. For the first time, temperature variation and distribution at drill exit have been revealed in full detail, associated with the CFRP material properties and drilling conditions. Results suggest that the actual drill/CFRP interactions have critical but similar effects on the drill-exit temperatures for UD and MD CFRPs. Specifically, three distinct cutting regions with varying temperature characteristics are evident when the main cutting edge is acting on the drill exit material. In all cases, the temperature distribution features elliptical shape, of which the eccentricity depends on the lay-up sequence and the drilling depth. In addition, the real-time temperature profiles and 2D/3D maximum temperature distribution maps are created with high visualization. With the aid of those findings, the relationships between drilling temperature maxima, their locations and drilling depths have been discovered and temperature effects on drill-exit damages have been elucidated for the first time. MD CFRP is proven more difficult to achieve high drilling qualities at certain fiber cutting angles than UD CFRP due to the associated temperature effects. Such important knowledge enables the identification of the heat affected zones and subsequently informs strategies for reducing the negative temperature effects.

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“…1. The influence of fiber cutting angle has been widely investigated by many researchers [6,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] in order to describe chip removal mechanisms in unidirectional CFRP.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

Geier

Pereszlai

2019

Period. Polytech. Mech. Eng.

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Measuring and characterizing of surface roughness of machined surfaces of carbon fiber reinforced polymer (CFRP) composites are difficult due to the occurrence of special surface damages (delamination, uncut fibers, fiber pull-outs or micro-cracks, etc.). The main objective of the present study is to analyze the characteristics of surface roughness of machined unidirectional CFRP in detail. Numerous conventional drilling, helical milling, and edge trimming experiments were carried out with different cutting tools in order to analyze the influence of them on the average surface roughness (Ra), on the roughness depth (Rz) and on the Rz /Ra parameter. The surface roughness was measured by a Mitutoyo SJ-400 contact profilometer and an Alicona Infinite Focus confocal microscope. The usability of the contact profilometer was experimentally tested and compared its results with the results of the confocal microscope. Experimental results show that the contact profilometer is suitable for measuring surface roughness of CFRP, furthermore, values of Rz /Ra of drilled and edge trimmed surfaces of unidirectional CFRP are changing in a wide interval: from 5 to 14 μm/μm due to the special surface damages. Based on this research, the machinability analysis of CFRP is suggested to be extended to the analysis of the Rz /Ra parameter.

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Novel drill structure for damage reduction in drilling CFRP composites

Cited by 197 publications

References 28 publications

Effect of drill flute direction on delamination at the exit in drilling Carbon Fiber Reinforced Plastic

Effect of drill flute direction on delamination at the exit in drilling Carbon Fiber Reinforced Plastic

Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

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