Estimation of heat flux and temperature field during drilling process using dynamic observers based on Green's function

Sousa, Priscila F.B.; Borges, Valério Luiz; Pereira, Igor Cézar; Silva, Márcio Bacci da; Guimarães, Gilmar

doi:10.1016/j.applthermaleng.2012.04.061

Cited by 33 publications

(9 citation statements)

References 8 publications

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“…It was highlighted that coated cutting tools were resistant to abrasion and that a better quality of hole was obtained with them. Previous studies reported that increasing the cutting speed in operations using coated drills led to a decline in the cutting forces and torque [6][7][8][9][10]. They emphasized that mathematical models had been developed using the results of various experimental data analyses, and that most of the analysis results of these models had proven to be compatible [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Theoretical Modelling of Cutting Parameters in the Drilling of AISI H13 Steel with Coated and Uncoated Drills

Tekaüt

Demir

Şeker

2018

TFAMENA

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SummaryIn this study, drillability experiments were carried out on the AISI H13 hot work steel which is difficult to machine. Uncoated and AlCrN-coated carbide drills, ø14 mm, were used at 4 cutting speeds (60, 75, 90 and 108 m/min) and three different feed rates (0.15, 0.20 and 0.25 mm/rev). As a result of the experimental work, it was observed that an increase in the feed rate caused an increased on the thrust force in the workpiece machined with both the uncoated and coated drills. While an increase in the cutting speed caused the thrust force to increase in operations performed with uncoated drills, the increased cutting speed led to a decreased torque. In contrast, an increase in the cutting speed caused both the thrust force and the torque to decrease in the operations with coated drills. Stresses occurring on the drills were analyzed and a mathematical model was developed using the finite element method and the ANSYS Workbench package software.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Theoretical Modelling of Cutting Parameters in the Drilling of AISI H13 Steel with Coated and Uncoated Drills

Tekaüt

Demir

Şeker

2018

TFAMENA

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“…Siyambaş and Turgut [18] compared the same drills in relation to axial (progressive) force and torque, the increase of feed increased forces and angular moments, for lower cutting speed (10 and 18 m/min), the force and moment differences between the cutting tools were small, and at higher cutting speeds (26 and 42 m/min), the forces and moments with coated drills were 43% lower than the uncoated drills. Sousa et al [19] modeled the transient heat conduction in drilling process of a 36 mm thickness HSLA plate, validated the model with thermocouples by measuring the heat flow generated using a coated 10 mm drill, dry process, with 2000 rpm and feed of 20 mm/min, obtaining a deviation of 2 °C between the estimated and measured temperatures. Pereira et al [20] observed increased roughness with increased feed rate, in heavy conditions the flank wear and radial wear were greater than 250 μm in dry drilling.…”

Section: Introductionmentioning

confidence: 99%

Fatigue failure analysis of HSLA steel sheets holed by conventional and flow drilling processes

et al. 2019

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Flow drilling process produces bushes for removable joints that can be threaded by forming tapping process, reducing stages in production of components of automobile industry and in construction sheds. High strength and low alloy steels (HSLA) are employed on several applications in the processing industry. Benefits provided by these materials make them an efficient solution, since their high cold resistance allows reducing weight on structures, as well as maintaining the required mechanical properties. The present study evaluated the conventional and friction drilling processes in HSLA steel sheets with a thickness of 4.25 mm. Specimens were subjected to cyclic loadings, with no rework after holemaking, so the resultant characteristics of each process were maintained. Fractured surfaces were analyzed with a scanning electron microscope (SEM) to identify the fracture mechanism in different drilling processes. Fractographies obtained on both processes indicated that the failure mechanism occurred due to ductile fracture resulting from the nucleation, growth and coalescence of micro cavities.

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“…Sousa ve arkadaşları, 10 mm çapında kaplamalı takımlar ile yüksek dirençli, düşük alaşımlı (HSLA) çeliğin delinmesi sırasında oluşan sıcaklıkları K tipi ısıl çiftler kullanılarak ölçmüşlerdir. Sıcaklığın, matkabın iş parçası içerisinde ilerlerken ilk 10 sn' de matkap ucu ve çevresine, 170 sn sonra ise iş parçasının tümüne iş parçasının ısı iletkenliği bağlı olarak yayıldığını tespit etmişlerdir [16]. Li, yüksek hızda Ti-6A1-4V titanyum alaşımının, sabit matkapdönen iş parçası tertibatında delinmesi esnasında sıcaklık ve gerilim dağılımını incelemiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Aisi H13 Ve Aisi D2 Çeli̇kleri̇ni̇n Deli̇nmesi̇ Esnasinda Kesme Bölgesi̇nde Oluşan Sicakliğa Kesi̇ci̇ Takim Kaplamasinin Ve İşleme Parametreleri̇ni̇n Etki̇si̇

Tekaüt¹,

Demir²

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETDelik delme işleminde, takım ve işlem performansı için sıcaklık önemli bir faktördür. Bu nedenle kesme bölgesinde oluşan sıcaklığın analiz edilmesi işlem performansının tahmin edilebilmesi açısından önemlidir. Bu amaçla, sanayide sıkça kullanılan AISI H13 ve AISI D2 malzemeleri 14 mm çapında kaplamasız ve (AlCrN monolayer) kaplamalı karbür matkaplarla dik işleme merkezinde delinmiştir. Kesme bölgesinde oluşan sıcaklıklar matkapların soğutma kanallarına yerleştirilen ısıl çiftler yardımıyla ölçülmüştür. Deneylerde dört farklı kesme hızı (60, 75, 90 ve 108 m/dak) ve üç farklı ilerleme miktarı (0.15, 0.20 ve 0.25 mm/dev) kullanılmıştır. Deneysel çalışma sonucu, ilerleme miktarı ve kesme hızı artışı sıcaklığın azalmasına yol açmıştır. Kaplamalı matkapların kaplama özelliğinden dolayı ısı iletim katsayısının düşük olması, kaplamalı matkaplarla yapılan işlemlerde sıcaklığın daha fazla olmasına neden olmuştur. Bütün deneylerde, AISI H13 malzemesinin işlenmesi esnasında oluşan sıcaklık değerleri AISI D2 malzemesinin işlenmesi esnasında oluşan sıcaklık değerlerinden daha fazla çıkmıştır. Bu duruma malzemelerin yapısal ve kimyasal farklılıklarının neden olduğu düşünülmektedir.Anahtar Kelimeler: Delik delme, AISI H13 çeliği, AISI D2 çeliği, takım kaplaması, sıcaklık ölçümü THE EFFECTS OF CUTTING TOOL COATING AND MACHINING PARAMETERS IN DRILLING OF STEEL AISI H13 AND AISI D2 ABSTRACTIn drilling, temperature is an important factor for the tool and the machining performance. For this reason, analysis of the temperature in the cutting zone is essential for predicting the machining performance. In this study, commonly used AISI H13 and AISI D2 steels were drilled using uncoated and (AlCrN monolayer) coated carbide drills of 14 mm diameter on a vertical machining centre. The cutting zone temperatures were determined using the thermocouples inserted into the coolant holes of the drills. The tests were carried out at four different cutting speeds (60, 75, 90 and 108 m/min) and three different feed rates (0.15, 0.20 and 0.25 mm/rev). The experimental results showed that increasing feed rate and cutting speed led to decrease in the temperature. The lower heat conduction of the coated drills resulted in the higher temperature. In all the tests, drilling of AISI H13 caused higher temperature than that of AISI D2. It is considered that this was caused by the structural and chemical differences of the materials.

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Estimation of heat flux and temperature field during drilling process using dynamic observers based on Green's function

Cited by 33 publications

References 8 publications

Experimental Analysis and Theoretical Modelling of Cutting Parameters in the Drilling of AISI H13 Steel with Coated and Uncoated Drills

Experimental Analysis and Theoretical Modelling of Cutting Parameters in the Drilling of AISI H13 Steel with Coated and Uncoated Drills

Fatigue failure analysis of HSLA steel sheets holed by conventional and flow drilling processes

Aisi H13 Ve Aisi D2 Çeli̇kleri̇ni̇n Deli̇nmesi̇ Esnasinda Kesme Bölgesi̇nde Oluşan Sicakliğa Kesi̇ci̇ Takim Kaplamasinin Ve İşleme Parametreleri̇ni̇n Etki̇si̇

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