Drill geometry and operating effects when cutting small diameter holes in CFRP

Shyha, Islam; Aspinwall, D.K.; Soo, Sein Leung; Bradley, Sam

doi:10.1016/j.ijmachtools.2009.05.009

Cited by 215 publications

(100 citation statements)

References 14 publications

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“…Moreover, the effect of increase in cutting speed is more significant on the peel-up delamination than the push-down delamination, as shown in Figure 7. This quantitative interpretation of peel-up and push-down delamination with varying cutting speed is equivalent to the microscopic analysis (see Figure 6) and is also found in strong agreement in similar studies [11][12][13]27,39,57]. In Figure 7, the least peel-up and push-down delamination are recorded for 9000 rpm and 6000 rpm, respectively.…”

Section: Delamination Factor (F D )supporting

confidence: 88%

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Ali

Yue

et al. 2018

JMMP

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Abstract:The drilling of carbon fiber reinforced polymer (CFRP) plate is very critical in its structural applications in aeronautical, aerospace, and automobile industries. For ensuring the good quality of drilled holes in terms of least drilling damage and prolonged tool life, suitable selection of drill geometry and material, and drilling parameters-such as cutting speed and feed rate-are imperative in the drilling of CFRP plate. This study aims to evaluate the cutting performance of conventional two-flute twist drills made of cemented tungsten carbide YG6X (WC-6 wt % Co) for the dry drilling of the multidirectional T700 CFRP plate. The effects of varying cutting speed and tool wear pattern on the drilling performance are analyzed. The drilling performance is assessed in terms of hole quality by the qualitative and quantitative analysis of drilling-induced delamination and hole diameter. Furthermore, the correlation between the tool wear progression and the drilled hole quality is established. Through this assessment, a suitable set of drilling parameters, i.e., cutting speed of 9000 rpm and feed rate of 400 mm/min, is proposed for producing the best quality holes for multidirectional T700 CFRP plate.

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Section: Delamination Factor (F D )supporting

confidence: 88%

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Ali

Yue

et al. 2018

JMMP

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“…However on push-out, contribution percentages of both of these cutting parameters were nearly the same under different tool geometries. For small drills, the study (Shyha et al 2009) used an ANOVA analysis (Montgomery 2009) (with α=5 %) using six input parameters. For the entry delamination, the drill type was found to be the only significant parameter, with no influence from cutting parameters.…”

Section: Motivation Of the Present Studymentioning

confidence: 99%

“…On the other hand, cutting speed has shown some slight influence on the cutting force. Instead, it has been shown that the feed rate is much more influential on both damage generation (delamination) and thrust force during drilling of composites (Shyha et al 2009;Davim and Reis 2003). As another cutting parameter, variation of the point angle of the drill bit has shown different results on the generation of delamination and cutting force.…”

Section: Introductionmentioning

confidence: 99%

Drilling optimization of woven CFRP laminates under different tool wear conditions: a multi-objective design of experiments approach

Feito

Milani

Muñoz-Sánchez

2015

Struct Multidisc Optim

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“…However, such techniques need to cope with the water treatment, acoustic noise hazards and abrasive slurry disposal. In addition, they introduce moisture absorption and abrasive penetration of the cut surfaces [6]. Delamination and abrasive embedment between plies are also of major concern during AWJ machining of composites [7].…”

Section: Introductionmentioning

confidence: 99%

“…However, as laser machining of CFRP composite is based on the interaction of a laser beam with at least two different materials with large material property differences, defects that are thermal in origin, such as HAZ, charring, matrix recession and delamination, are generated which are major obstacles in advancing laser machining of CFRP composites [3]. Among these defects HAZs may damage the structural properties of the composite materials [6]. Consequently, it is considered as a critical quality parameter in assessing the quality of the laser cutting of CFRP composites in this work.…”

Section: Introductionmentioning

confidence: 99%

TEA CO2 laser machining of CFRP composite

Salama

Mativenga

et al. 2016

Appl. Phys. A

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Carbon fibre-reinforced polymer (CFRP) composites have found wide applications in the aerospace, marine, sports and automotive industries owing to their lightweight and acceptable mechanical properties compared to the commonly used metallic materials. Machining of CFRP composites using lasers can be challenging due to inhomogeneity in the material properties and structures, which can lead to thermal damages during laser processing. In the previous studies, Nd:YAG, diode-pumped solidstate, CO 2 (continuous wave), disc and fibre lasers were used in cutting CFRP composites and the control of damages such as the size of heat-affected zones (HAZs) remains a challenge. In this paper, a short-pulsed (8 ls) transversely excited atmospheric pressure CO 2 laser was used, for the first time, to machine CFRP composites. The laser has high peak powers (up to 250 kW) and excellent absorption by both the carbon fibre and the epoxy binder. Design of experiment and statistical modelling, based on response surface methodology, was used to understand the interactions between the process parameters such as laser fluence, repetition rate and cutting speed and their effects on the cut quality characteristics including size of HAZ, machining depth and material removal rate (MRR). Based on this study, process parameter optimization was carried out to minimize the HAZ and maximize the MRR. A discussion is given on the potential applications and comparisons to other lasers in machining CFRP.

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Drill geometry and operating effects when cutting small diameter holes in CFRP

Cited by 215 publications

References 14 publications

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Drilling optimization of woven CFRP laminates under different tool wear conditions: a multi-objective design of experiments approach

TEA CO2 laser machining of CFRP composite

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