The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform
Hiroyuki Sasahara - One of the best experts on this subject based on the ideXlab platform.
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the effect on fatigue life of residual stress and surface hardness resulting from different cutting conditions of 0 45 c steel
International Journal of Machine Tools & Manufacture, 2005Co-Authors: Hiroyuki SasaharaAbstract:The affected layer is generated within the machined surface layer through the cutting process. Cutting conditions such as the nose radius of the tool, feed rate and shape of cutting edge at the Finishing Operation affect the residual stress, surface hardness, and surface roughness. In this paper, it is shown that such machined surface property could be controlled by the setting of the cutting conditions to some extent. Then the effect of the machining conditions on the fatigue life was investigated through a fatigue test using the specimen finished under various cutting conditions. It was shown that it is possible to get longer fatigue life for machined parts than the virgin material or the carefully finished material without affected layer, only by setting the proper cutting conditions. Such a situation was realized when the generated residual stress was small and the induced surface hardness was high. A longer fatigue life for the machined components can be obtained by applying such cutting conditions as a low feed rate, a small corner radius and a chamfered cutting edge tool.
I. Cascón - One of the best experts on this subject based on the ideXlab platform.
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Pulsed ultrasonic assisted electrical discharge machining for Finishing Operations
International Journal of Machine Tools and Manufacture, 2016Co-Authors: M. Goiogana, J.a. Sarasua, J.m. Ramos, L. Echavarri, I. CascónAbstract:Abstract Electrical Discharge Machining (EDM) is a non-conventional machining process specially suitable for manufacturing hard-to-machine materials or geometrically complex parts. Many investigations have been presented combining EDM with ultrasonic (US) vibration of the electrode, but most of them have been intended to enhance the material removal rate of the process. In this paper US assisted EDM process has been used in order to improve the surface roughness in a Finishing Operation. For that purpose a copper rod tool electrode and a 1.2344 tempered alloy steel workpiece have been used. A pulsed US assisted EDM mode (PUEDM) has been developed and compared with the current EDM process and EDM assisted with continuous US vibration (UEDM). The results show that PUEDM process can improve the surface roughness and homogeneity of the machined surfaces in Finishing EDM Operations.
Anthony Texier - One of the best experts on this subject based on the ideXlab platform.
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simulation of a Finishing Operation milling of a turbine blade and influence of damping
Volume 4: Advanced Manufacturing Processes; Biomedical Engineering; Multiscale Mechanics of Biological Tissues; Sciences Engineering and Education; Mu, 2012Co-Authors: Philippe Lorong, Gérard Coffignal, Etienne Balmès, Mikhail Guskov, Anthony TexierAbstract:Milling is used to create very complex geometries and thin parts, such as turbine blades. Irreversible geometric defects may appear during Finishing Operations when a high surface quality is expected. Relative vibrations between the tool and the workpiece must be as small as possible, while tool/workpiece interactions can be highly non-linear. A general virtual machining approach is presented and illustrated. It takes into account the relative motion and vibrations of the tool and the workpiece. Both deformations of the tool and the workpiece are taken into account. This allows predictive simulations in the time domain. As an example the effect of damping on the behavior during machining of one of the 56 blades of a turbine disk is analysed in order to illustrate the approach potential.© 2012 ASME
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Simulation of a Finishing Operation : milling of a turbine blade and influence of damping
2012Co-Authors: Philippe Lorong, Gérard Coffignal, Etienne Balmès, Mikhail Guskov, Anthony TexierAbstract:Milling is used to create very complex geometries and thin parts, such as turbine blades. Irreversible geometric defects may appear during Finishing Operations when a high surface quality is expected. Relative vibrations between the tool and the workpiece must be as small as possible, while tool/workpiece interactions can be highly non-linear. A general virtual machining approach is presented and illustrated. It takes into account the relative motion and vibrations of the tool and the workpiece. Both deformations of the tool and the workpiece are taken into account. This allows predictive simulations in the time domain. As an example the effect of damping on the behavior during machining of one of the 56 blades of a turbine disk is analysed in order to illustrate the approach potential.
Viktoria V. Kurbatkina - One of the best experts on this subject based on the ideXlab platform.
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Nanoparticle Dispersion Strengthened WC–C Based Coatings on Ti‐alloy Produced by Sequential Chemical Reaction Assisted Pulsed Electrospark Deposition
Plasma Processes and Polymers, 2009Co-Authors: Evgeny A. Levashov, E. I. Zamulaeva, Yury S. Pogozhev, Viktoria V. KurbatkinaAbstract:In this work, we explored the effects of the electrode material constituents and structure on the composition, tribological properties, and roughness of electrospark deposited coatings. Nanostructured (WC grain size below 0.1 µm) and microstructured (WC grain size 1–2 µm) electrodes based on 92% WC–8% Co composition were used to produce coatings on titanium alloy substrates. Fine-pored graphite (FPG) and carbon–carbon fiber composite (CCFC) electrodes were additionally used for surface smoothing as a Finishing Operation. The use of the nanostructured electrodes resulted in the formation of fine-grained, hard, and wear-resistant coatings. Surface Finishing treatment with graphite-containing electrodes was found to decrease friction coefficients and improve the wear resistance of coatings deposited with both nano- and microstructured electrodes. This Finishing Operation provided lower surface roughness, change in the phase composition of the coatings, and formation of surface graphite for solid lubrication.
Jerry L. Hatfield - One of the best experts on this subject based on the ideXlab platform.
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Odorous compounds sources and transport from a swine deep-pit Finishing Operation: A case study.
Journal of environmental management, 2018Co-Authors: Steven Trabue, Kenwood Scoggin, John C. Tyndall, Thomas J. Sauer, Guillermo Hernandez-ramirez, Richard Pfeiffer, Jerry L. HatfieldAbstract:Abstract Odor emissions from swine Finishing Operations are an air quality issue that affects residents at the local level. A study was conducted at a commercial swine deep-pit Finishing Operation in central Iowa to monitor odorous compounds emitted and transported offsite. Gaseous compounds were sampled using either sorbent tubes or canisters with GC/MS analysis, and particulates matter (PM10) were sampled with high volume samplers and thermally extracted onto sorbent tubes for GC/MS analysis. Major odorous chemical classes detected at the swine facility included volatile sulfur compounds (VSC), volatile fatty acids (VFA), phenol and indole compounds. Manure storage was the main source of odorous compounds of which hydrogen sulfide (H2S), methanethiol, 4-methylphenol, and 3-methylindole were key offenders. Only H2S and 4-methylphenol were detected above odor threshold values (OTV) at all locations around the facility and both 4-methylphenol and 3-methylindole were detected above their OTV 1.5 km downwind from the swine facility. Odorous compounds generated during agitation and pumping of the deep pits was mainly H2S. Odorants were mainly transported in the gas phase with less than 0.1% being associated with PM10. Odor mitigation efforts should focus on gaseous compounds emitted from deep-pits and especially during manure agitation and deep-pit pumping.