The Experts below are selected from a list of 56298 Experts worldwide ranked by ideXlab platform
I S Jawahir - One of the best experts on this subject based on the ideXlab platform.
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cryogenic cooling induced process performance and Surface Integrity in drilling cfrp composite material
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: T Xia, Yusuf Kaynak, C Arvin, I S JawahirAbstract:Therehasbeenasubstantialgrowthinusingcarbon fiber-reinforced plastic (CFRP) composite materials in aero- space and automotive industries due to their superior proper- ties. This experimental study presents results from a compre- hensive and systematic study investigating the effects of cryo- genic cooling on drilling performance and Surface Integrity characteristics of CFRP composite material. Experimental da- ta on cutting edge radius of drill bit, outer corner wear of drill bit, trust force, torque, delamination factor, and Surface integ- ritycharacteristics,includingboreholesubSurfacedamageand diameter error of drilled hole, are presented and analyzed comparing dry drilling with cryogenic cooling of CFRP com- posite material. The findings demonstrate that cryogenic cooling has a profound effect on reducing the cutting edge rounding of drill bit and outer corner wear; it also helps en- hancing the Surface Integrity characteristics of produced hole. However, cryogenic cooling generates larger thrust force, torque, and thus larger delamination factor.
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cryogenic machining induced Surface Integrity a review and comparison with dry mql and flood cooled machining
Machining Science and Technology, 2014Co-Authors: Yusuf Kaynak, I S JawahirAbstract:The process of cryogenic machining, due to increased demand for environmentally friendly manufacturing processes, has seen a growing interest in the machining community. This article presents an overview of cryogenic machining and its induced Surface Integrity characteristics such as Surface roughness, topography, grain refinement and machining-induced layer, microhardness, phase transformation, residual stress and fatigue life in machining of various materials including difficult-to-machine materials, aerospace alloys, lightweight materials, etc. The effect of cryogenic machining on Surface Integrity characteristics is discussed, and compared with dry, Minimum Quantity Lubrication (MQL), and flood-cooled machining processes. In addition to being an environmentally friendly process, this study shows that cryogenic machining significantly contributes to improved functional performance of machined components through its superior and more desirable Surface Integrity characteristics.
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The effects of cooling conditions on Surface Integrity in machining of Ti6Al4V alloy
The International Journal of Advanced Manufacturing Technology, 2014Co-Authors: G. Rotella, Domenico Umbrello, O. W. Dillon, L. Settineri, I S JawahirAbstract:This paper presents results from a comparative study of machining of Ti6Al4V alloy under dry, minimal quality lubrication, and cryogenic cooling conditions using coated tools at varying cutting speeds and feed rates. The influence of the cooling conditions on Surface Integrity and the product performance was studied in terms of Surface roughness, metallurgical conditions, including microstructure, hardness, grain refinement, and phase transformation of the machined product. Results show that cooling conditions affect Surface Integrity of the product signifying the benefits of cryogenic cooling in improving the overall product performance.
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Surface Integrity characteristics of niti shape memory alloys resulting from dry and cryogenic machining
Procedia CIRP, 2014Co-Authors: Yusuf Kaynak, H E Karaca, I S JawahirAbstract:NiTi alloys are extensively used in many industries due to their unique properties such as su per elasticity, shape memory and phase transformation. Since the NiTi alloys have temperature-dependent mechanical and material properties, this work focuses on the effects o f dry and cryogenic machining processes on Surface Integrity characteristics of NiTi alloys. Surface quality and topography, m icrostructure, transformation response and phase transformation temperatures of machined specimens are measured to assess the mach ining-induced Surface Integrity characteristics of NiTi alloys. Obtained results illustrate that machining of NiTi alloys under d ifferent cutting and cooling conditions affects their resulting Surface Integrity characteristics. Moreover, as compared to dry mach ining, cryogenic machining helps to improve Surface quality and has substantial effects on the phase transformation behavior o f machined specimens.
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Enhanced Surface Integrity of AZ31B Mg alloy by cryogenic machining towards improved functional performance of machined components
International Journal of Machine Tools & Manufacture, 2012Co-Authors: Z. Pu, Jose Outeiro, Antonio Castanhola Batista, O W Dillon, David A Puleo, I S JawahirAbstract:Abstract Surface Integrity of machined components has a critical impact on their performance. Magnesium alloys are lightweight materials used in the transportation industry and are also emerging as a potential material for biodegradable medical implants. Surface Integrity factors, such as grain size, crystallographic orientation and residual stress, have been proved to remarkably influence the functional performance of magnesium alloys, including corrosion/wear resistance and fatigue life. In this study, the influence of dry and cryogenic machining (liquid nitrogen was sprayed on the machined Surface during machining) using different cutting edge radius tools on Surface Integrity was investigated. Compared with the initial material, cryogenic machining when using a large edge radius tool led to enhanced Surface Integrity in terms of the following: (1) improved Surface finish; (2) significant grain refinement from 12 μm to 31 nm in the featureless Surface layer; (3) large intensity of (0002) basal plane on the machined Surface; (4) 10 times larger compressive areas in residual stress profiles; these changes should notably improve the functional performance of machined AZ31B Mg alloy. In addition to the frequently reported benefits on tool life, this study suggests that cryogenic machining may also enhance the Surface Integrity of the workpiece and improve the performance of machined components.
Domenico Umbrello - One of the best experts on this subject based on the ideXlab platform.
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Surface Integrity of machined additively manufactured ti alloys
Journal of Materials Processing Technology, 2018Co-Authors: Giovanna Rotella, Stano Imbrogno, Sebastiano Candamano, Domenico UmbrelloAbstract:Abstract Additive manufacturing processes (AM) offer the possibility to easily fabricate three-dimensional parts with high geometrical complexity. However, the additively manufactured components often require finishing operations, such as machining, showing a different machinability than those produced with conventional processes. Thus, it is crucial to study the effect of the manufacturer suggested cutting parameters on the Surface Integrity of the AM components, since they can behave differently than the correspondent wrought materials. The aim of the present work is to investigate the Surface and subSurface modifications induced by turning operations performed on additively manufactured titanium alloys. The material under investigation is the grade 5 titanium alloy (Ti6Al4V) produced by three different methods namely, Electron Beam Melting (EBM), Direct Metal Laser Sintering (DMLS) and conventionally wrought processes. The effect of such processes on machinability and Surface Integrity is herein extensively studied (nano-hardness, plastically deformed layers, microstructural alterations etc.). In particular, the morphological, chemical and mechanical analyses on the pre- and post-machined samples highlight the influence of the production processes on their Surface Integrity underlying the need to properly redesign the machining parameters accordingly.
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the effects of cutting conditions on Surface Integrity in machining waspaloy
Key Engineering Materials, 2014Co-Authors: Domenico UmbrelloAbstract:Machining of advanced aerospace materials have grown in the recent years although the difficult-to-machine characteristics of alloys like titanium or nickel based alloys cause higher cutting forces, rapid tool wear, and more heat generation. Therefore, machining with the use of cooling lubricants is usually carried out. To reduce the production costs and to make the processes environmentally safe, the goal is to move toward dry cutting by eliminating cutting fluids. This objective can be achieved by using coated tool, by increasing cutting speed and by improving the product performance in term of Surface Integrity and product quality. The paper addresses the effects of cutting speed and feed on the Surface Integrity during dry machining of Waspaloy using coated tools. In particular, the influence of the cutting conditions on mechanical power consumption, the tool wear and some important indicator of the Surface Integrity (Surface roughness, affected layer, microhardness, grain size and microstructural alteration) were investigated. Results show that cutting conditions have a significant effect on the parameters related to the Surface Integrity of the product affecting its overall performance.
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The effects of cooling conditions on Surface Integrity in machining of Ti6Al4V alloy
The International Journal of Advanced Manufacturing Technology, 2014Co-Authors: G. Rotella, Domenico Umbrello, O. W. Dillon, L. Settineri, I S JawahirAbstract:This paper presents results from a comparative study of machining of Ti6Al4V alloy under dry, minimal quality lubrication, and cryogenic cooling conditions using coated tools at varying cutting speeds and feed rates. The influence of the cooling conditions on Surface Integrity and the product performance was studied in terms of Surface roughness, metallurgical conditions, including microstructure, hardness, grain refinement, and phase transformation of the machined product. Results show that cooling conditions affect Surface Integrity of the product signifying the benefits of cryogenic cooling in improving the overall product performance.
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investigation of Surface Integrity in dry machining of inconel 718
The International Journal of Advanced Manufacturing Technology, 2013Co-Authors: Domenico UmbrelloAbstract:Machining of advanced aerospace materials have grown in the recent years although the diffucult-to-machine characteristics of alloys like titanium or nickel-based alloys cause higher cutting forces, rapid tool wear, and more heat generation. Therefore, machining with the use of cooling lubricants is usually carried out. To reduce the production costs and to make the processes environmentally safe, the goal is to move toward dry cutting by eliminating cutting fluids. This objective can be achieved by using coated tool, by increasing cutting speed, and by improving the product performance in term of Surface Integrity and product quality. The paper addresses the effects of cutting speed and feed on the Surface Integrity during dry machining of Inconel 718 alloy using coated tools. In particular, the influence of the cutting conditions on Surface roughness, affected layer, microhardness, grain size, and microstructural alteration was investigated. Results show that cutting conditions have a significant effect on the parameters related to the Surface Integrity of the product affecting its overall performance.
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the effects of cryogenic cooling on Surface Integrity in hard machining a comparison with dry machining
Cirp Annals-manufacturing Technology, 2012Co-Authors: Domenico Umbrello, F Micari, I S JawahirAbstract:Abstract This paper presents results of an experimental study of cryogenic machining of hardened AISI 52100 steel, focusing on Surface Integrity. Experiments were performed under dry and cryogenic cooling conditions using CBN tools varying cutting speeds, workpiece hardness and tool geometry. Surface Integrity parameters (Surface roughness, white layer thickness, residual stresses, metallurgical conditions including grain size, phase transformation, etc.) were investigated to establish the effects of cryogenic cooling on the Surface Integrity of the machined component, and results were compared with those from dry hard machining. Overall, cryogenic cooling provides improved Surface Integrity leading to extended product life and performance.
Jose Outeiro - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Surface Integrity of AZ31B Mg alloy by cryogenic machining towards improved functional performance of machined components
International Journal of Machine Tools & Manufacture, 2012Co-Authors: Z. Pu, Jose Outeiro, Antonio Castanhola Batista, O W Dillon, David A Puleo, I S JawahirAbstract:Abstract Surface Integrity of machined components has a critical impact on their performance. Magnesium alloys are lightweight materials used in the transportation industry and are also emerging as a potential material for biodegradable medical implants. Surface Integrity factors, such as grain size, crystallographic orientation and residual stress, have been proved to remarkably influence the functional performance of magnesium alloys, including corrosion/wear resistance and fatigue life. In this study, the influence of dry and cryogenic machining (liquid nitrogen was sprayed on the machined Surface during machining) using different cutting edge radius tools on Surface Integrity was investigated. Compared with the initial material, cryogenic machining when using a large edge radius tool led to enhanced Surface Integrity in terms of the following: (1) improved Surface finish; (2) significant grain refinement from 12 μm to 31 nm in the featureless Surface layer; (3) large intensity of (0002) basal plane on the machined Surface; (4) 10 times larger compressive areas in residual stress profiles; these changes should notably improve the functional performance of machined AZ31B Mg alloy. In addition to the frequently reported benefits on tool life, this study suggests that cryogenic machining may also enhance the Surface Integrity of the workpiece and improve the performance of machined components.
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Surface Integrity analysis of machined inconel 718 over multiple length scales
Cirp Annals-manufacturing Technology, 2012Co-Authors: Rachid Msaoubi, Jose Outeiro, Tommy Larsson, Sergey Suslov, Christopher Saldana, Srinivasan ChandrasekarAbstract:Abstract Surface Integrity characteristics of machined Inconel 718 have been measured using experimental techniques, such as FEG-SEM, EBSD, XRD, TEM, nano-indentation and 3D optical microscopy. Nanosized grains typical of severe plastic deformation are characteristic of the machined Surface while deformation in the form of plastic slip bands is typical of subSurface layers. Correlations are presented between deformation features on the machined Surface, and cutting parameters and tool wear.
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Surface Integrity in dry and cryogenic machining of az31b mg alloy with varying cutting edge radius tools
Procedia Engineering, 2011Co-Authors: Jose Outeiro, Antonio Castanhola Batista, O W Dillon, David A Puleo, I S JawahirAbstract:Abstract Surface Integrity of machined products has a critical impact on their functional performance. Magnesium alloys are lightweight materials for transportation industry and are also emerging as a potential material for temporary biomedical implants. However, their unsatisfactory corrosion resistance limits their application to a great extent. Surface Integrity factors, such as grain size, crystallographic orientation and residual stresses, were reported to have significant influence on corrosion resistance of AZ31 Mg alloys. In this study, AZ31B Mg discs were orthogonally turned using cutting tools with two edge radii under both dry and cryogenic conditions. The influence of cutting edge radius and cooling method on Surface Integrity was investigated. Cryogenic machining using a large edge radius tool led to a thicker grain refinement layer, larger compressive residual stresses and stronger intensity of basal texture, which may remarkably enhance the corrosion performance of magnesium alloys.
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Surface Integrity in material removal processes recent advances
Cirp Annals-manufacturing Technology, 2011Co-Authors: I S Jawahir, Domenico Umbrello, Jose Outeiro, D K Aspinwall, E Brinksmeier, Rachid Msaoubi, Daniel Meyer, A D JayalAbstract:Abstract This paper is a result of a three-year study by the CIRP's Collaborative Working Group on Surface Integrity and Functional Performance of Components, and it reports recent progress in experimental and theoretical investigations on Surface Integrity in material removal processes. Experimental techniques for measuring various Surface Integrity parameters are presented. Results from a Round Robin Study on Surface Integrity parameters such as residual stresses, hardness and roughness in turning, milling, grinding, and EDM, are then presented. Finally, results and analysis of a benchmarking study comparing available predictive models for Surface Integrity are presented, followed by concluding remarks and future research directions.
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the effects of cryogenic cooling on Surface Integrity in hard machining
Procedia Engineering, 2011Co-Authors: Domenico Umbrello, Jose Outeiro, A D Jayal, O. W. Dillon, Serafino Caruso, I S JawahirAbstract:Abstract This paper presents the results of an experimental investigation to determine the effects of cryogenic coolant on Surface Integrity in orthogonal machining of hardened AISI 52100 bearing steel. Experiments were performed under dry and cryogenic conditions using chamfered CBN tool inserts. Several experimental techniques were used in the analyzing of the machined Surface and subSurface: optical and scanning electron microscopes (SEM) were utilized for the Surface topography characterization; chemical characterization (phase study) was carried out by means of Energy-dispersive spectroscopy (EDS) techniques; and X-ray diffraction (XRD) technique was used to determine residual stresses and phase changes induced by dry and cryogenic machining. The results show the benefits and the future potential of cryogenic cooling for Surface Integrity enhancement to achieve improved product's functional performance in hard machining.
Dragos Axinte - One of the best experts on this subject based on the ideXlab platform.
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state of the art of Surface Integrity in machining of metal matrix composites
International Journal of Machine Tools & Manufacture, 2019Co-Authors: Zhirong Liao, Ali M Abdelhafeez, Yue Yang, Oriol Gavalda Diaz, Dragos AxinteAbstract:Abstract Metal matrix composites (MMCs), as advanced substitutes of monolithic metallic materials, are currently getting an increasing trend of research focus as well as industrial applications for demanding applications such as aerospace, nuclear and automotive because of their enhanced mechanical properties and relative lightweight. Nevertheless, machining of MMC materials remains a challenging task as a result of their structural heterogeneity which leads to deterioration of the machined Surface Integrity and rapid tool wear. While most of the research was focused on testing and analytical/numerical investigations of the tool wear, limited work was focused on machined Surface Integrity of MMCs. This paper presents a detailed literature survey on the conventional and non-conventional machining of metal matrix composites with the primary focus on the aspects related to workpiece Surface Integrity. The contribution of material mechanical and microstructural properties as well as the material removal mechanism upon the quality of workpiece Surfaces/subSurface are discussed along with their influences on the fatigue performance of machined part.
D K Aspinwall - One of the best experts on this subject based on the ideXlab platform.
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Surface Integrity in material removal processes recent advances
Cirp Annals-manufacturing Technology, 2011Co-Authors: I S Jawahir, Domenico Umbrello, Jose Outeiro, D K Aspinwall, E Brinksmeier, Rachid Msaoubi, Daniel Meyer, A D JayalAbstract:Abstract This paper is a result of a three-year study by the CIRP's Collaborative Working Group on Surface Integrity and Functional Performance of Components, and it reports recent progress in experimental and theoretical investigations on Surface Integrity in material removal processes. Experimental techniques for measuring various Surface Integrity parameters are presented. Results from a Round Robin Study on Surface Integrity parameters such as residual stresses, hardness and roughness in turning, milling, grinding, and EDM, are then presented. Finally, results and analysis of a benchmarking study comparing available predictive models for Surface Integrity are presented, followed by concluding remarks and future research directions.
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workpiece Surface Integrity considerations when finish turning gamma titanium aluminide
Wear, 2001Co-Authors: A R C Sharman, D K Aspinwall, R C Dewes, P BowenAbstract:Abstract Gamma titanium aluminides (γ-TiAl) are currently being evaluated by aeroengine manufacturers as possible replacements for conventional titanium alloys and nickel based superalloys in gas turbine engines. Unfortunately, even when machining using operating parameters selected to minimise workpiece damage, turned Surfaces contain cracks and microstructural alterations. The paper initially reviews prior work on the Surface Integrity of γ-TiAl produced by various machining processes. Following on from this, Surface Integrity data from a full factorial experiment are presented when turning Ti–45Al–2Mn–2Nb+0.8 vol.% TiB 2 employing extremely fine finishing cuts. Workpiece Surfaces/subSurfaces were evaluated in relation to microstructural alterations, strain hardening/microhardness changes, and 2D Surface roughness (Ra). All the machined Surfaces contained cracks, cracked TiB 2 particles, deformed microstructure and microhardness increases regardless of the operating parameters. However, when comparing the Surfaces with those obtained in previous work using more abusive parameters, a significant reduction in Surface damage was obtained.
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Surface Integrity and fatigue life of turned gamma titanium aluminide
Journal of Materials Processing Technology, 1997Co-Authors: A L Mantle, D K AspinwallAbstract:Abstract This paper outlines the effect of single-point turning on the Surface Integrity and fatigue life of a gamma XD™ titanium aluminide (Ti–45Al–2Nb–2Mn–0.8% TiB2) produced by Howmet, USA. Intermetallic materials of this type are currently been evaluated by leading aerospace companies world-wide for use in aeroengine applications (e.g. compressor blades), due to their good high-temperature properties and low density (≈50% of Ni-based superalloys). Workpiece Surface Integrity defects were found after machining, including deformed lammellae/Surface drag, material pull-out/cracking (
