Investigation on hole quality of cutting conditions in drilling of CFRP composite

J Braz. Soc. Mech. Sci. Eng.

Günay

2019

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This study focused on the influences of drilling parameters on hole quality and thrust force in drilling of carbon fiberreinforced polymer (CFRP) composite laminates via variable feed rate. Drilling experiments were carried out by using three different cutting speeds, feed rates and the qualities of tungsten carbide drill. Scanning electron microscopy and coordinate measurement machine were used for hole surface damage and diameter analyses, and also a portable instrument and 3D optical profilometer were utilized for surface roughness measurement. It was identified that thrust force (F z), delamination factor (F d) and average surface roughness (R a) values attained in drilling processes by variable feed rate are lower than those of constant feed rate with average of 14%, 3% and 18%, respectively. Besides, the hole diameter (D) values obtained with variable feed rate in hole exit were higher than those of constant feed rate. Moreover, the higher F z values were obtained with diamond-coated and TiAlN-coated drills than those of uncoated drill with 55% and 77%, respectively. The interactive influences of drilling parameters on machinability factors were evaluated via analysis of variance, and then, the most significant parameter was specified as the feed rate for F d , just as the drill quality for F z , R a and D. According to the experimental and statistical results, we suggested that the novel drilling strategy is a significant alternative for the step hole and conventional drilling of CFRP laminates.

Section: Average Surface Roughness (R a )mentioning

confidence: 99%

“…8a) in drilling with high cutting speed and feed rate as also mentioned in Refs. [31,32]. Additionally, severe debonding at fiber-matrix interface because of increasing drilling temperature with high cutting speed led to matrix debris and cavities ( Fig.…”

Section: Average Surface Roughness (R a )mentioning

confidence: 99%

Experimental investigation on novel drilling strategy of CFRP laminates using variable feed rate

J Braz. Soc. Mech. Sci. Eng.

Günay

2019

Self Cite

“…In all variables of cutting speed (15-25 m/min), depending on the increase in the feed rate, there is a rise in Fz values for both cutting tools. The volume of chip removed can be explained with the increase in Fz and feed rate [45][46][47][48][49][50]. For each cutting speed, it has been calculated by an average of 74.6% and 30% for uncoated and coated cutting inserts by increasing the feed rate from 0.05mm/rev by 100%.…”

Section: Assessment Of Experimental Thrust Forcementioning

confidence: 99%

Investigation of microstructure, mechanical and machinability properties of Mo-added steel produced by powder metallurgy method

Erden

Int J Adv Manuf Technol

Korkmaz

et al. 2021

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This study presents the impact of molybdenum (Mo) inclusion on microstructure, mechanical, and machinability behavior of steels manufactured with powder metallurgy (PM) approach. PM steel samples with different molybdenum ratios were pressed at 750-MPa pressing pressure and sintered in the atmosphere-controlled tube furnace at 1400°C for 1 h. While particle size and distribution of phases of PM steels with different molybdenum ratios were determined by optical microscope, mechanical properties were determined by applying tensile test. The results were observed that 3% Mo weight-added steel displayed the maximum yield and tensile strength. In addition, the machinability properties of 3% Mo-added steel, which has the highest yield and tensile strength, were investigated. In this work, we researched the thrust force and surface roughness as machinability output, and drilling parameters on the output were determined by utilizing analysis of variance. Finally, SEM images were taken from the inner surfaces of the machined holes and the fractured surfaces from tensile test, and information about the machinability of this alloy produced with PM was presented. As a result, an increase in yield and tensile strength and a reduction in strain were identified with the increase in Mo content. Moreover, the coated cutting tools are better on the machining output than the uncoated cutting tools in terms of green environment. The most important factors on the Fz and Ra are the coating condition and the feed rate with 56.53% and 43.62% PCR, respectively.

“…Kara İlerleme miktarının (f) artması ile hem deneysel hem de nümerik analiz sonuçlarında itme kuvvetinin (F z ) arttığı gözlenirken, kesme hızının artması ile itme kuvvetinin (F z ) azaldığı belirlenmiştir. Bu sonuçlar literatür ile doğru orantılı olup nümerik modelleme çalışmalarının geçerli olduğunu göstermiştir [15][16][17]. Deneysel ve simülasyon sonuçları arasında ortalama %7 kabul edilebilir sınırlar içerisinde sapma olduğu tespit edilmiştir.…”

Section: Giriģunclassified

Al2014 Alüminyum Alaşımının Delinmesinde İtme Kuvvetinin Sonlu Elemanlar Yöntemi İle Analizi

Korkmaz

Çakıroğlu

El-Cezeri Fen Ve Mühendislik Dergisi

et al. 2019

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Bu çalışmanın amacı, Al2014 alüminyum alaşımının kaplamasız sementit karbür takım ile delinmesi sonucunda itme kuvvetinin deneysel ve simülasyon sonuçlarını kıyaslamaktır. Deneysel çalışmada, farklı seviyelerde kesme parametreleri (kesme hızı ve ilerleme miktarı) kullanılarak delme işlemi yapılmıştır. Kesme kuvveti için nümerik analizler, sonlu elemanlar yöntemine dayalı çözümleme yapan ThirdWave Advantedge simülasyon programıyla gerçekleştirilmiştir. 0,1, 0,2 ve 0,3 mm/dev sabit ilerleme miktarlarında kesme hızının %35 artmasıyla itme kuvveti sırasıyla %9,1, %12,8 ve %18,6 düşmüştür. 170, 200 ve 230 sabit kesme hızlarında, ilerleme miktarının 0,1'den 0,3 mm/dev'e çıkarılmasıyla itme kuvveti sırasıyla %23,9, %16,1 ve %11 artmıştır. İtme kuvvetinin kesme hızının artmasıyla azaldığı, ilerleme miktarının artması arttığı belirlenmiştir. Sonlu elemanlar yöntemiyle gerçekleştirilen delme simülasyon sonuçları da deneysel sonuçlar ile benzerlik göstermiştir. Çalışma sonucunda, deneysel olarak ölçülen itme kuvveti ile simülasyon sonucunda elde edilen kuvvet değerleri arasında ortalama %7'lik bir fark olduğu belirlenmiş ve sonlu elemanlar modelinin uygulanabilirliği kanıtlanmıştır.