Thermal analysis in Ti-6Al-4V drilling

Lazoğlu, İsmail; Poulachon, Gérard; Ramirez, Christophe; Akmal, Mohammad; Marcon, Bertrand; Rossi, Frédéric; Outeiro, José; Krebs, Michaël

doi:10.1016/j.cirp.2017.04.020

Cited by 34 publications

(15 citation statements)

References 18 publications

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“…These findings are in agreement with the observations made by Pardo et al [24] when drilling aluminium/ aluminium stacks. The aforementioned damage due to abrasion is further exacerbated by the CFRP's low degradation temperature, which is approximately 160°-200° [ 34,40] and, as such, significantly lower than the cutting temperatures typically found when drilling titanium, which depending on the cutting parameters vary between 400°and 800° [38,41,42]. With the cutting temperature this high, it is reasonable to assume that the temperature of the titanium chips is still significantly higher than the CFRP's degradation temperature.…”

Section: Influence Of Interlayer Gap Size On Interface Qualitymentioning

confidence: 99%

The impact of tool point angle and interlayer gap width on interface borehole quality in drilling CFRP/titanium stacks

Pardo

Gall

Heinemann

et al. 2021

Int J Adv Manuf Technol

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Although substantial research work has been conducted in order to understand and improve the drilling of multi-material aerospace stacks, some key aspects related to process and tool parameters and their impact on the interface quality still need to be addressed. This paper reports on the research conducted to investigate the impact of tool point angle and interlayer gap width on borehole quality, focussing on the interface region. A number of drilling tests were carried out using tools with different point angles and CFRP/titanium stacks with different interlayer gap widths. The results show that the damage on the CFRP interlayer surface is caused by the drilling of the titanium layer, as some of the upwards-travelling titanium chips penetrate into the stack interface. An increase in tool point angle results in larger entry burrs on the titanium interlayer surface, which is attributed to the correlation between tool point angle and thrust force and the capability of tools with low point angles to remove damage generated by surface skidding. The introduction of an interlayer gap promotes the ingress of titanium chips into the stack interface, thereby leading to more pronounced interface damage.

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Section: Influence Of Interlayer Gap Size On Interface Qualitymentioning

confidence: 99%

The impact of tool point angle and interlayer gap width on interface borehole quality in drilling CFRP/titanium stacks

Pardo

Gall

Heinemann

et al. 2021

Int J Adv Manuf Technol

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“…The surface temperature is approximated to the average temperature in the thickness which enables to estimate the term in 2 / 2 in the heat equation by a leakage term [15]. The heat equation obtained with this hypothesis is illustrated by (3).…”

Section: /2mentioning

confidence: 99%

“…In various recent studies, the temperature during the drilling process is frequently evaluated by means of thermocouples inserted in the workpiece [1,2] or in the lubrification holes of the drill bits [3]. Infrared thermography is another used technique to evaluate the in-process temperature.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Validation of a multi-scale Ti-6Al-4V drilling model by means of thermomechanical field measurements

Bonnet¹,

Pottier²,

Landon³

et al. 2021

Esaform 2021

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Drilling operations lead to temperatures and forces that may locally reach significant magnitude and thus impair the surface and material integrity. Optimizing the cutting conditions could limit these degradations, which are more significant in the case of low thermal conductivity materials such as titanium alloys. Robust numerical modelling is a relevant alternative to such issues but must rely on strong in-process experimental measurements. Unfortunately, the confined nature of the cutting area during drilling prevent from any straight forward field-measurement. The proposed multi-scale strategy consists in validating the developed 3D FEM models both at micrometric and millimetric scales, using coupled full-field measurements. The limited access to the cutting area is overcome by means i) of oblique cutting tests at microscale and ii) tube drilling tests. Thermal fields are evaluated using an infrared camera while kinematic fields are determined by image correlation (DIC) using a high-speed camera. The experimental and numerical fields are then compared, and numerical results are extended over several revolutions by means of purely thermal 2D analytical model.

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“…Şekil 1. Ti-6Al-4V'nin delinmesinde sıcaklık oluşumu [20] (Temperature formation at drilling of the Ti-6Al-4V) Şekil 2. Ti-6Al-4V'nin delinmesinde takım malzemesinin kesme kuvveti üzerine etkisi [36] (The effect of tool materials on cutting force in the drilling of Ti-6Al-4V) [16] (Tool SEM images belonging to drilling of Ti-48% Al-2% Cr-2% Nb alloy)…”

Section: Ti-6al-4v Alaşiminin Deli̇nmesi̇ (Drilling Of Ti-6al-4v Alloy)unclassified

Titanyum Alaşımlarından Ti-6Al-4V’nın İşlenmesinde Karşılaşılan Zorluklar: Derleme

Çelik¹,

Kılıçkap²

2018

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Titanyum ve alaşımları, mükemmel ısı direnci, korozyon direnci, tokluk, mukavemet, yüksek çalışma sıcaklığı ve düşük ağırlık oranına sahip oldukları için uzay-havacılık, otomotiv, kimyapetrokimya ve biyomedikal gibi çeşitli endüstrilerde yüksek mühendislik alaşımları olarak kullanılmaktadırlar. Ancak bu alaşımlar düşük işlenebilirlik derecelerine sahiptirler. Titanyum ve alaşımlarının işlenmesinde yüzey bütünlüğü ve kesici takım aşınması gibi problemlerle karşılaşılmaktadır. Bu çalışmada, titanyum ve alaşımlarının delinmesinde, frezelenmesinde ve tornalanmasında kesici takım malzemeleri, aşınma mekanizmaları, kesme kuvvetleri, yüzey pürüzlülükleri gibi konular gözden geçirilmiştir. Ayrıca, bu alaşımların işlenmesinde karşılaşılan zorluklar değerlendirilmiş olup yapılmış literatür çalışmaları ayrıntılı olarak ele alınmıştır.

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Thermal analysis in Ti-6Al-4V drilling

Cited by 34 publications

References 18 publications

The impact of tool point angle and interlayer gap width on interface borehole quality in drilling CFRP/titanium stacks

The impact of tool point angle and interlayer gap width on interface borehole quality in drilling CFRP/titanium stacks

Validation of a multi-scale Ti-6Al-4V drilling model by means of thermomechanical field measurements

Titanyum Alaşımlarından Ti-6Al-4V’nın İşlenmesinde Karşılaşılan Zorluklar: Derleme

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