The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Eduardo Carlos Bianchi - One of the best experts on this subject based on the ideXlab platform.
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toward sustainable grinding using minimum quantity Lubrication Technique with diluted oil and simultaneous wheel cleaning
Tribology International, 2020Co-Authors: Bruno Kenta Sato, Jose Claudio Lopes, Anselmo Eduardo Diniz, Alessandro Roger Rodrigues, H J De Mello, Luiz Eduardo De Angelo Sanchez, Paulo Roberto De Aguiar, Eduardo Carlos BianchiAbstract:Abstract Minimum Quantity of Lubricant (MQL) has been used in the grinding process to make the process eco-friendlier. On the other hand, it brings some technical problems to this process: the clogging phenomenon, i.e., chips adherence on the wheel cutting surface. Although this phenomenon yields widely known negative effects on productivity and workpiece quality, few studies exist about clogging in MQL grinding. Thus, this paper aims to explain the clogging formation and evaluate its effects on workpiece finishing and geometrical tolerances. External cylindrical plunge grinding tests in quenched and tempered AISI 4340 steel with CBN wheel, varying lubri-cooling conditions were carried out. Clogging affects the cutting ability of the grinding wheel and impacts on the chip formation. The addition of water in the MQL flow reduced the clogging occurrence in 40%, which corroborated to a reduction of 51% the surface roughness and 58% the roundness error.
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application of the auxiliary wheel cleaning jet in the plunge cylindrical grinding with minimum quantity Lubrication Technique under various flow rates
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2019Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Paulo Roberto De Aguiar, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Mark J JacksonAbstract:Minimum Quantity Lubrication is an alternative Technique to conventional Techniques that are related to environmental sustainability and economic benefits. This Technique promotes the substantial r...
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plunge cylindrical grinding with the minimum quantity Lubrication coolant Technique assisted with wheel cleaning system
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Paulo Roberto De AguiarAbstract:MQL Technique is considered as a cleaner machining compared to the conventional coolant delivery one, thereby ensuring environmental sustainability and economic benefits. However, one of problems commonly reported when using the MQL Technique is the wheel clogging phenomenon as a result of the inefficient chip removal from the cutting zone, then the chips lodge inside the pores of the grinding wheel, adversely affecting the quality and the finishing of the final product. In this context, this study was carried out to evaluate the performance of the minimum quantity Lubrication coolant Technique assisted with a wheel cleaning jet (MQL + WCJ) in plunge grinding of hardened steel. This cooling-Lubrication Technique was tested using the following flow rates: 30, 60, and 120 ml/h. Comparative tests were also carried out with the conventional coolant Technique, as well as with the traditional MQL Technique (without the wheel cleaning jet). The output variables used to assess the efficiency of the MQL + WCJ Technique are roughness, roundness, workpiece microhardness, grinding wheel wear, and power consumption. The results showed that the machining with the MQL + WCJ Technique outperformed the traditional MQL Technique in all the output parameters investigated. Also, the efficiency of the MQL + WCJ Technique increased with flow rate, thereby being an alternative coolant delivery Technique in grinding due to cleaner environment, more sustainable and lower consumption of fluid compared to conventional coolant one. No thermal damages and cracks on the machined surface and sub-surfaces were observed after grinding AISI 4340 steel, irrespective of the Technique.
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Performance evaluation of various cooling-Lubrication Techniques in grinding of hardened AISI 4340 steel with vitrified bonded CBN wheel
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Ricardo Fernando Damasceno, Rosemar Batista Silva, Rodrigo De Souza Ruzzi, H J De Mello, Paulo Roberto De Aguiar, Thiago Valle França, Eduardo Carlos BianchiAbstract:In the grinding process, to achieve improved tribological conditions between wheel-chip-workpiece interfaces and minimize the effects of thermal damages, such as loss of hardness and cracks for example, it is needed to minimize the high amount of heat generated by the process. In addition to the correct adjusting of the cutting parameters, it is also to select an efficient coolant delivery Technique (that includes coolant concentration, coolant flow rate, and nozzle geometry) and properties of abrasive wheels for successful grinding. Therefore, seeking for cooling-Lubrication Techniques with improved coolant efficiency and that can preserve surface integrity of the workpiece, as well as that make rational use of cutting fluids, becomes indispensable. Into this context, this investigation aims to evaluate the performance of different coolant-Lubrication conditions during the surface grinding of AISI 4340 steel with a vitrified bonded CBN superabrasive wheel under various cutting conditions. Three coolant delivery Techniques (flooding, MQL, and optimized Webster system) were tested. The input cutting parameters was depth of cut values (20, 50, and 80 μm). Tangential component force, specific energy, surface roughness, microhardness and surface residual stress of the machined surfaces, as well as abrasive wheel wear and G ratio were monitored and used to assess the performance of the different coolant-Lubrication under the conditions investigated. The results showed that, in general, the optimized Technique outperformed other coolant Techniques in all the parameters evaluated because of the better access of cutting jet to the grinding area, especially at more severe cutting conditions. MQL Technique exhibited superior performance in terms of cutting force and specific energy, but it was in general responsible for generation of poorer finishing and the highest microhardness variation in regions closer to machined surfaces. With regard the residual stresses, they were predominantly compressive, irrespective of the depth of cut and cooling-Lubrication Technique employed. A slight variation of the residual stresses values with depth of cut after machining with the optimized and the MQL coolant Technique, unlike the pattern observed after machining with the conventional coolant delivery Technique. Finally, no significant thermal damages or cracks were observed on the machined surfaces after machining under all the cutting conditions.
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MQL with water in cylindrical plunge grinding of hardened steels using CBN wheels, with and without wheel cleaning by compressed air
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Rodrigo De Souza Ruzzi, Anselmo Eduardo Diniz, H J De Mello, Paulo Roberto De Aguiar, Rafael De Mello Belentani, Rubens Chinali Canarim, Doriana M. D’addona, Eduardo Carlos BianchiAbstract:Minimum quantity of lubricant (MQL) in grinding is an alternative for reducing abundant fluid flow and both environmental and health hazards when compared with conventional fluid application. In spite of the fact that MQL is considered an innovative cost-effective and environmentally friendly Technique, when used in grinding its inadequate application can increase cutting temperature and wheel clogging, worsening surface roughness, and increasing geometric and dimensional errors. The present study aims to evaluate improvements in MQL in grinding using MQL + water (1:1, 1:3, and 1:5 parts of oil per parts of water), when compared to MQL without water and conventional cooling-Lubrication Technique. Wheel cleaning by compressed air was also tested, aimed for unclogging of the wheel pores. The tests were performed in a plunge cylindrical grinder with CBN wheel and workpieces of AISI 4340 for different feed rates. The ground workpieces were analyzed with respect to the surface roughness, roundness errors, microhardness, and microscopic changes. In addition, tangential cutting force and diametric wheel wear were investigated. The results observed for the MQL plus water in the proportion of 1:5, with wheel cleaning system (at 30° inclination angle of the air nozzle) were the best, when compared to MQL without water, and close to the conventional flood coolant, implying that this Technique is a potential alternative for cooling-Lubrication when applied properly.
Paulo Roberto De Aguiar - One of the best experts on this subject based on the ideXlab platform.
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toward sustainable grinding using minimum quantity Lubrication Technique with diluted oil and simultaneous wheel cleaning
Tribology International, 2020Co-Authors: Bruno Kenta Sato, Jose Claudio Lopes, Anselmo Eduardo Diniz, Alessandro Roger Rodrigues, H J De Mello, Luiz Eduardo De Angelo Sanchez, Paulo Roberto De Aguiar, Eduardo Carlos BianchiAbstract:Abstract Minimum Quantity of Lubricant (MQL) has been used in the grinding process to make the process eco-friendlier. On the other hand, it brings some technical problems to this process: the clogging phenomenon, i.e., chips adherence on the wheel cutting surface. Although this phenomenon yields widely known negative effects on productivity and workpiece quality, few studies exist about clogging in MQL grinding. Thus, this paper aims to explain the clogging formation and evaluate its effects on workpiece finishing and geometrical tolerances. External cylindrical plunge grinding tests in quenched and tempered AISI 4340 steel with CBN wheel, varying lubri-cooling conditions were carried out. Clogging affects the cutting ability of the grinding wheel and impacts on the chip formation. The addition of water in the MQL flow reduced the clogging occurrence in 40%, which corroborated to a reduction of 51% the surface roughness and 58% the roundness error.
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application of the auxiliary wheel cleaning jet in the plunge cylindrical grinding with minimum quantity Lubrication Technique under various flow rates
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2019Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Paulo Roberto De Aguiar, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Mark J JacksonAbstract:Minimum Quantity Lubrication is an alternative Technique to conventional Techniques that are related to environmental sustainability and economic benefits. This Technique promotes the substantial r...
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plunge cylindrical grinding with the minimum quantity Lubrication coolant Technique assisted with wheel cleaning system
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Paulo Roberto De AguiarAbstract:MQL Technique is considered as a cleaner machining compared to the conventional coolant delivery one, thereby ensuring environmental sustainability and economic benefits. However, one of problems commonly reported when using the MQL Technique is the wheel clogging phenomenon as a result of the inefficient chip removal from the cutting zone, then the chips lodge inside the pores of the grinding wheel, adversely affecting the quality and the finishing of the final product. In this context, this study was carried out to evaluate the performance of the minimum quantity Lubrication coolant Technique assisted with a wheel cleaning jet (MQL + WCJ) in plunge grinding of hardened steel. This cooling-Lubrication Technique was tested using the following flow rates: 30, 60, and 120 ml/h. Comparative tests were also carried out with the conventional coolant Technique, as well as with the traditional MQL Technique (without the wheel cleaning jet). The output variables used to assess the efficiency of the MQL + WCJ Technique are roughness, roundness, workpiece microhardness, grinding wheel wear, and power consumption. The results showed that the machining with the MQL + WCJ Technique outperformed the traditional MQL Technique in all the output parameters investigated. Also, the efficiency of the MQL + WCJ Technique increased with flow rate, thereby being an alternative coolant delivery Technique in grinding due to cleaner environment, more sustainable and lower consumption of fluid compared to conventional coolant one. No thermal damages and cracks on the machined surface and sub-surfaces were observed after grinding AISI 4340 steel, irrespective of the Technique.
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Performance evaluation of various cooling-Lubrication Techniques in grinding of hardened AISI 4340 steel with vitrified bonded CBN wheel
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Ricardo Fernando Damasceno, Rosemar Batista Silva, Rodrigo De Souza Ruzzi, H J De Mello, Paulo Roberto De Aguiar, Thiago Valle França, Eduardo Carlos BianchiAbstract:In the grinding process, to achieve improved tribological conditions between wheel-chip-workpiece interfaces and minimize the effects of thermal damages, such as loss of hardness and cracks for example, it is needed to minimize the high amount of heat generated by the process. In addition to the correct adjusting of the cutting parameters, it is also to select an efficient coolant delivery Technique (that includes coolant concentration, coolant flow rate, and nozzle geometry) and properties of abrasive wheels for successful grinding. Therefore, seeking for cooling-Lubrication Techniques with improved coolant efficiency and that can preserve surface integrity of the workpiece, as well as that make rational use of cutting fluids, becomes indispensable. Into this context, this investigation aims to evaluate the performance of different coolant-Lubrication conditions during the surface grinding of AISI 4340 steel with a vitrified bonded CBN superabrasive wheel under various cutting conditions. Three coolant delivery Techniques (flooding, MQL, and optimized Webster system) were tested. The input cutting parameters was depth of cut values (20, 50, and 80 μm). Tangential component force, specific energy, surface roughness, microhardness and surface residual stress of the machined surfaces, as well as abrasive wheel wear and G ratio were monitored and used to assess the performance of the different coolant-Lubrication under the conditions investigated. The results showed that, in general, the optimized Technique outperformed other coolant Techniques in all the parameters evaluated because of the better access of cutting jet to the grinding area, especially at more severe cutting conditions. MQL Technique exhibited superior performance in terms of cutting force and specific energy, but it was in general responsible for generation of poorer finishing and the highest microhardness variation in regions closer to machined surfaces. With regard the residual stresses, they were predominantly compressive, irrespective of the depth of cut and cooling-Lubrication Technique employed. A slight variation of the residual stresses values with depth of cut after machining with the optimized and the MQL coolant Technique, unlike the pattern observed after machining with the conventional coolant delivery Technique. Finally, no significant thermal damages or cracks were observed on the machined surfaces after machining under all the cutting conditions.
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MQL with water in cylindrical plunge grinding of hardened steels using CBN wheels, with and without wheel cleaning by compressed air
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Rodrigo De Souza Ruzzi, Anselmo Eduardo Diniz, H J De Mello, Paulo Roberto De Aguiar, Rafael De Mello Belentani, Rubens Chinali Canarim, Doriana M. D’addona, Eduardo Carlos BianchiAbstract:Minimum quantity of lubricant (MQL) in grinding is an alternative for reducing abundant fluid flow and both environmental and health hazards when compared with conventional fluid application. In spite of the fact that MQL is considered an innovative cost-effective and environmentally friendly Technique, when used in grinding its inadequate application can increase cutting temperature and wheel clogging, worsening surface roughness, and increasing geometric and dimensional errors. The present study aims to evaluate improvements in MQL in grinding using MQL + water (1:1, 1:3, and 1:5 parts of oil per parts of water), when compared to MQL without water and conventional cooling-Lubrication Technique. Wheel cleaning by compressed air was also tested, aimed for unclogging of the wheel pores. The tests were performed in a plunge cylindrical grinder with CBN wheel and workpieces of AISI 4340 for different feed rates. The ground workpieces were analyzed with respect to the surface roughness, roundness errors, microhardness, and microscopic changes. In addition, tangential cutting force and diametric wheel wear were investigated. The results observed for the MQL plus water in the proportion of 1:5, with wheel cleaning system (at 30° inclination angle of the air nozzle) were the best, when compared to MQL without water, and close to the conventional flood coolant, implying that this Technique is a potential alternative for cooling-Lubrication when applied properly.
H J De Mello - One of the best experts on this subject based on the ideXlab platform.
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toward sustainable grinding using minimum quantity Lubrication Technique with diluted oil and simultaneous wheel cleaning
Tribology International, 2020Co-Authors: Bruno Kenta Sato, Jose Claudio Lopes, Anselmo Eduardo Diniz, Alessandro Roger Rodrigues, H J De Mello, Luiz Eduardo De Angelo Sanchez, Paulo Roberto De Aguiar, Eduardo Carlos BianchiAbstract:Abstract Minimum Quantity of Lubricant (MQL) has been used in the grinding process to make the process eco-friendlier. On the other hand, it brings some technical problems to this process: the clogging phenomenon, i.e., chips adherence on the wheel cutting surface. Although this phenomenon yields widely known negative effects on productivity and workpiece quality, few studies exist about clogging in MQL grinding. Thus, this paper aims to explain the clogging formation and evaluate its effects on workpiece finishing and geometrical tolerances. External cylindrical plunge grinding tests in quenched and tempered AISI 4340 steel with CBN wheel, varying lubri-cooling conditions were carried out. Clogging affects the cutting ability of the grinding wheel and impacts on the chip formation. The addition of water in the MQL flow reduced the clogging occurrence in 40%, which corroborated to a reduction of 51% the surface roughness and 58% the roundness error.
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application of the auxiliary wheel cleaning jet in the plunge cylindrical grinding with minimum quantity Lubrication Technique under various flow rates
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2019Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Paulo Roberto De Aguiar, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Mark J JacksonAbstract:Minimum Quantity Lubrication is an alternative Technique to conventional Techniques that are related to environmental sustainability and economic benefits. This Technique promotes the substantial r...
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plunge cylindrical grinding with the minimum quantity Lubrication coolant Technique assisted with wheel cleaning system
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Eduardo Carlos Bianchi, Rosemar Batista Silva, Jose Claudio Lopes, H J De Mello, Rafael Lemes Rodriguez, Rodolfo Alexandre Hildebrandt, Paulo Roberto De AguiarAbstract:MQL Technique is considered as a cleaner machining compared to the conventional coolant delivery one, thereby ensuring environmental sustainability and economic benefits. However, one of problems commonly reported when using the MQL Technique is the wheel clogging phenomenon as a result of the inefficient chip removal from the cutting zone, then the chips lodge inside the pores of the grinding wheel, adversely affecting the quality and the finishing of the final product. In this context, this study was carried out to evaluate the performance of the minimum quantity Lubrication coolant Technique assisted with a wheel cleaning jet (MQL + WCJ) in plunge grinding of hardened steel. This cooling-Lubrication Technique was tested using the following flow rates: 30, 60, and 120 ml/h. Comparative tests were also carried out with the conventional coolant Technique, as well as with the traditional MQL Technique (without the wheel cleaning jet). The output variables used to assess the efficiency of the MQL + WCJ Technique are roughness, roundness, workpiece microhardness, grinding wheel wear, and power consumption. The results showed that the machining with the MQL + WCJ Technique outperformed the traditional MQL Technique in all the output parameters investigated. Also, the efficiency of the MQL + WCJ Technique increased with flow rate, thereby being an alternative coolant delivery Technique in grinding due to cleaner environment, more sustainable and lower consumption of fluid compared to conventional coolant one. No thermal damages and cracks on the machined surface and sub-surfaces were observed after grinding AISI 4340 steel, irrespective of the Technique.
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Performance evaluation of various cooling-Lubrication Techniques in grinding of hardened AISI 4340 steel with vitrified bonded CBN wheel
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Ricardo Fernando Damasceno, Rosemar Batista Silva, Rodrigo De Souza Ruzzi, H J De Mello, Paulo Roberto De Aguiar, Thiago Valle França, Eduardo Carlos BianchiAbstract:In the grinding process, to achieve improved tribological conditions between wheel-chip-workpiece interfaces and minimize the effects of thermal damages, such as loss of hardness and cracks for example, it is needed to minimize the high amount of heat generated by the process. In addition to the correct adjusting of the cutting parameters, it is also to select an efficient coolant delivery Technique (that includes coolant concentration, coolant flow rate, and nozzle geometry) and properties of abrasive wheels for successful grinding. Therefore, seeking for cooling-Lubrication Techniques with improved coolant efficiency and that can preserve surface integrity of the workpiece, as well as that make rational use of cutting fluids, becomes indispensable. Into this context, this investigation aims to evaluate the performance of different coolant-Lubrication conditions during the surface grinding of AISI 4340 steel with a vitrified bonded CBN superabrasive wheel under various cutting conditions. Three coolant delivery Techniques (flooding, MQL, and optimized Webster system) were tested. The input cutting parameters was depth of cut values (20, 50, and 80 μm). Tangential component force, specific energy, surface roughness, microhardness and surface residual stress of the machined surfaces, as well as abrasive wheel wear and G ratio were monitored and used to assess the performance of the different coolant-Lubrication under the conditions investigated. The results showed that, in general, the optimized Technique outperformed other coolant Techniques in all the parameters evaluated because of the better access of cutting jet to the grinding area, especially at more severe cutting conditions. MQL Technique exhibited superior performance in terms of cutting force and specific energy, but it was in general responsible for generation of poorer finishing and the highest microhardness variation in regions closer to machined surfaces. With regard the residual stresses, they were predominantly compressive, irrespective of the depth of cut and cooling-Lubrication Technique employed. A slight variation of the residual stresses values with depth of cut after machining with the optimized and the MQL coolant Technique, unlike the pattern observed after machining with the conventional coolant delivery Technique. Finally, no significant thermal damages or cracks were observed on the machined surfaces after machining under all the cutting conditions.
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MQL with water in cylindrical plunge grinding of hardened steels using CBN wheels, with and without wheel cleaning by compressed air
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Rodrigo De Souza Ruzzi, Anselmo Eduardo Diniz, H J De Mello, Paulo Roberto De Aguiar, Rafael De Mello Belentani, Rubens Chinali Canarim, Doriana M. D’addona, Eduardo Carlos BianchiAbstract:Minimum quantity of lubricant (MQL) in grinding is an alternative for reducing abundant fluid flow and both environmental and health hazards when compared with conventional fluid application. In spite of the fact that MQL is considered an innovative cost-effective and environmentally friendly Technique, when used in grinding its inadequate application can increase cutting temperature and wheel clogging, worsening surface roughness, and increasing geometric and dimensional errors. The present study aims to evaluate improvements in MQL in grinding using MQL + water (1:1, 1:3, and 1:5 parts of oil per parts of water), when compared to MQL without water and conventional cooling-Lubrication Technique. Wheel cleaning by compressed air was also tested, aimed for unclogging of the wheel pores. The tests were performed in a plunge cylindrical grinder with CBN wheel and workpieces of AISI 4340 for different feed rates. The ground workpieces were analyzed with respect to the surface roughness, roundness errors, microhardness, and microscopic changes. In addition, tangential cutting force and diametric wheel wear were investigated. The results observed for the MQL plus water in the proportion of 1:5, with wheel cleaning system (at 30° inclination angle of the air nozzle) were the best, when compared to MQL without water, and close to the conventional flood coolant, implying that this Technique is a potential alternative for cooling-Lubrication when applied properly.
M. M. Rahman - One of the best experts on this subject based on the ideXlab platform.
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Multi-objective optimization on the machining parameters for bio-inspired nanocoolant
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: K. Anamalai, Kumaran Kadirgama, L. Samylingam, M. Samykano, G. Najafi, D. Ramasamy, M. M. RahmanAbstract:The emphasis of this paper is to evaluate the thermophysical properties of crystalline nanocellulose (CNC)-based nanofluid and the optimized machining parameters (cutting speed, feed rate and depth of cut) for machining using CNC-based nanofluid. Cutting tool temperature and formed chip temperature during machining are determined with CNC-based coolant and metal working fluid. Minimum quantity Lubrication Technique is used to minimize the usage of the coolant. Nanocellulose coolant with a concentration of 0.5% shows better thermal conductivity and viscosity. Total heat produced at the cutting tool and the temperature generated at the chip during machining shows significant improvement using CNC-based nanofluid. Statistical analysis reveals that feed rate and depth of cut contribute around 27.48% and 22.66% toward cutting temperature. Meanwhile, none of the parameters significantly affects the heat transfer. The multi-objective optimization reveals that the optimum parameter for machining using CNC-based nanocoolant is: cutting speed = 120, feed rate = 0.05 and depth of cut = 1.78 which produces heat transfer of 379.44 J and cutting temperature of 104.41 °C.
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Experimental investigation of flank wear in end milling of aluminum alloy with water-based TiO_2 nanofluid lubricant in minimum quantity Lubrication Technique
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: M. S. Najiha, M. M. RahmanAbstract:This paper investigates the minimum quantity Lubrication Technique in end milling of aluminum alloy AA6061 with minimum quantity Lubrication (MQL) conditions using nanofluid. Wear mechanisms for the water-based TiO_2 nanofluid with a nanoparticle volume fraction of 1.5 % are compared with conventional oil-based minimum quantity Lubrication (0.48 and 0.83 ml/min) and flooded cooling conditions using an uncoated tungsten carbide insert. Wear mechanisms are characterized. Results show adhesion of the work material as the major tool damage phenomenon. Abrasion wear is also observed along with adhesion. The major benefit from the water-based nanofluid MQL is shown in the intact edge geometry, i.e., edge integrity showing very little chipping as well as edge fracture. This is attributed to the cooling effect produced by the latent heat of vaporization of water, resulting in lowering of temperature in the cutting zone.
F Rabiei - One of the best experts on this subject based on the ideXlab platform.
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improvement of surface grinding process performance of ck45 soft steel by minimum quantity Lubrication mql Technique using compressed cold air jet from vortex tube
Journal of Cleaner Production, 2016Co-Authors: A Saberi, M Ashrafijou, Abdolreza Rahimi, H Parsa, F RabieiAbstract:Abstract Consumption of cutting fluids imposes high costs on industries. Furthermore, they contaminate the environment and are harmful to human health. Minimum quantity Lubrication Technique (MQL) is an attractive alternative approach to reduce cutting fluids consumption, improve efficiency of cutting fluids at machining zone and use of harmless fluids. However, this Technique faces cooling limitation in grinding. The first purpose of this study is a comprehensive investigation of heat transfer mechanism in MQL Technique by its temperature numerical simulation. The second purpose is improvement of cooling ability of MQL air jet by using a simple and inexpensive vortex tube. To do this end, a system was designed and manufactured to measure the convection heat transfer coefficient of different conditions of cold air with MQL (CAMQL). The results of convection heat transfer tests show 95% share of compressed air in heat transfer. Also, the results indicate that air pressure is a more important factor than temperature in cooling process at high thermal power. The results of temperature numerical simulation show that by increasing pressure, the increasing rate of convection heat transfer coefficient decreases. Also, the temperature cooling ability of colder air with lower pressure is perceptible at low thermal power. In surface grinding of CK45 soft steel, CAMQL in comparison with dry and conventional fluid cooling leads to significant reduction of tangential grinding force and friction coefficient. But in general, except in the case of optimum condition which has the highest heat transfer coefficient, surface finish is worse. This is attributed to low heat transfer coefficient of gases at lower pressures.
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investigation of the effect of minimum quantity Lubrication Technique on performance of the grinding of hss
2013Co-Authors: F Rabiei, Abdolreza Rahimi, Mohammadjafar Hadad, M AshrafijouAbstract:In grinding operation, cutting fluid is utilized for Lubrication, cooling, chip removal from contact zone and also cleaning of grinding wheel. Despite these advantages, grinding fluids make many economic and environmental issues. On the other hand, dry grinding generally leading to thermal damages and reduction of surface quality level. Minimum Quantity Lubrication (MQL) Technique is a new approach to elimination or reduction of cutting fluids that improves grinding performance by efficient penetration to the cutting zone. In this paper, in order to investigate the effect of MQL on grinding of steels, raw and hardened High Speed Steel has been selected. Grinding performance such as tangential grinding force, friction coefficient, roughness and morphology of the ground surface and chip form in three states of dry, conventional fluid and MQL have been studied and compared. The results show that MQL Technique in comparison with the others lead to improvement of surface quality and also reduction of tangential grinding force and friction coefficient in hardened steel, but in the case of raw steel despite of reduction of tangential grinding force and friction coefficient, the surface quality is worst.
