The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

Qiang Liu - One of the best experts on this subject based on the ideXlab platform.

  • effects of Cooling Air temperature on cryogenic machining of ti 6al 4v alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air temperature on cryogenic machining of Ti–6Al–4V alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

Songmei Yuan - One of the best experts on this subject based on the ideXlab platform.

  • effects of Cooling Air temperature on cryogenic machining of ti 6al 4v alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air temperature on cryogenic machining of Ti–6Al–4V alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air Temperature and Cutting Velocity on Cryogenic Machining of 1Cr18Ni9Ti Alloy
    Applied Mechanics and Materials, 2011
    Co-Authors: Songmei Yuan, Sui Liu, Wei Dong Liu
    Abstract:

    This paper presents experimental investigations on influences of Cooling Air temperature, as well as cutting velocity, on performance in milling of the 1Cr18Ni9Ti alloy with coated cemented carbide inserts. Cutting force, tool wear and surface roughness are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear. Three different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of 1Cr18Ni9Ti alloy. Based on the experimental results, MQL with Cooling Air of −50°C provides more favorable effects compared to the other two Cooling Air temperatures (−10°C, −30°C). However, different Cooling Air temperatures have a slight effect on cutting force under the same MQL condition.

Lutao Yan - One of the best experts on this subject based on the ideXlab platform.

  • effects of Cooling Air temperature on cryogenic machining of ti 6al 4v alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air temperature on cryogenic machining of Ti–6Al–4V alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

Wei Dong Liu - One of the best experts on this subject based on the ideXlab platform.

  • effects of Cooling Air temperature on cryogenic machining of ti 6al 4v alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air temperature on cryogenic machining of Ti–6Al–4V alloy
    Journal of Materials Processing Technology, 2011
    Co-Authors: Songmei Yuan, Lutao Yan, Wei Dong Liu, Qiang Liu
    Abstract:

    Abstract This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with Cooling Air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without Cooling Air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with Cooling Air of −15 °C provides more favourable effects compared to other Cooling Air temperatures (0 °C, −30 °C,−45 °C). Short chips are produced under MQL with Cooling Air conditions due to the high velocity of Cooling Air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with Cooling Air environments cannot promote chip curl to some extent.

  • Effects of Cooling Air Temperature and Cutting Velocity on Cryogenic Machining of 1Cr18Ni9Ti Alloy
    Applied Mechanics and Materials, 2011
    Co-Authors: Songmei Yuan, Sui Liu, Wei Dong Liu
    Abstract:

    This paper presents experimental investigations on influences of Cooling Air temperature, as well as cutting velocity, on performance in milling of the 1Cr18Ni9Ti alloy with coated cemented carbide inserts. Cutting force, tool wear and surface roughness are experimentally studied to compare the effects of different Cooling Air temperatures. The results showed that minimum quantity lubrication (MQL) with Cooling Air significantly reduces cutting force, tool wear. Three different Cooling Air temperatures are used to investigate the effects of Cooling Air temperature on the machinability characteristics of 1Cr18Ni9Ti alloy. Based on the experimental results, MQL with Cooling Air of −50°C provides more favorable effects compared to the other two Cooling Air temperatures (−10°C, −30°C). However, different Cooling Air temperatures have a slight effect on cutting force under the same MQL condition.

Fulvio Magni - One of the best experts on this subject based on the ideXlab platform.

  • Impact of Cooling Air Injection on the Combustion Stability of a Premixed Swirl Burner Near Lean Blowout
    Journal of Engineering for Gas Turbines and Power, 2013
    Co-Authors: A. Marosky, V. Seidel, Thomas Sattelmayer, Fulvio Magni, Weiqun Geng
    Abstract:

    In most dry low NOx combustor designs of stationary gas turbines the front panel impingement Cooling Air is directly injected into the combustor primary zone. This Air partially mixes with the swirling flow of premixed reactants from the burner and reduces the effective equivalence ratio in the flame. However, local unmixedness and the lean equivalence ratio are supposed to have a major impact on combustion performance. Overall goal of this investigation is to answer the question whether the Cooling Air injection into the primary combustor zone has a beneficial effect on combustion stability and NOx emissions or not. The flame stabilization of a typical swirl burner with and without front panel Cooling Air injection is studied in detail under atmospheric conditions close to the lean blowout limit (LBO) in a full scale single burner combustion test rig. Based on previous isothermal investigations a typical injection configuration is implemented for the combustion tests. Isothermal results of experimental studies in a water test rig adopting high speed planar laser-induced fluorescence (HSPLIF) reveal the spatial and temporal mixing characteristics for the experimental setup studied under atmospheric combustion. This paper focuses on the effects of Cooling Air injection on both flame dynamics and emissions in the reacting case. To reveal dependencies of Cooling Air injection on combustion stability and NOx emissions, the amount of injected Cooling Air is varied. OH*-chemiluminescence measurements are applied to characterize the impact of Cooling Air injection on the flame front. Emissions are collected for different Cooling Air concentrations, both global measurements at the chamber exit and local measurements in the region of the flame front close to the burner exit. The effect of Cooling Air injection on pulsation level is investigated by evaluating the dynamic pressure in the combustor. The flame stabilization at the burner exit changes with an increasing degree of dilution with Cooling Air. Depending on the amount of Cooling only a specific share of the additional Air participates in the combustion process.Copyright © 2013 by ASME and Alstom Technology

  • Impact of Cooling Air Injection on the Combustion Stability of a Premixed Swirl Burner Near Lean Blowout
    Volume 1A: Combustion Fuels and Emissions, 2013
    Co-Authors: A. Marosky, V. Seidel, Thomas Sattelmayer, Fulvio Magni, Weiqun Geng
    Abstract:

    In most dry low NOx combustor designs of stationary gas turbines the front panel impingement Cooling Air is directly injected into the combustor primary zone. This Air partially mixes with the swirling flow of premixed reactants from the burner and reduces the effective equivalence ratio in the flame. However, local unmixedness and the lean equivalence ratio are supposed to have a major impact on combustion performance. Overall goal of this investigation is to answer the question whether the Cooling Air injection into the primary combustor zone has a beneficial effect on combustion stability and NOx emissions or not. The flame stabilization of a typical swirl burner with and without front panel Cooling Air injection is studied in detail under atmospheric conditions close to the lean blowout limit (LBO) in a full scale single burner combustion test rig. Based on previous isothermal investigations a typical injection configuration is implemented for the combustion tests. Isothermal results of experimental studies in a water test rig adopting high speed planar laser-induced fluorescence (HSPLIF) reveal the spatial and temporal mixing characteristics for the experimental setup studied under atmospheric combustion. This paper focuses on the effects of Cooling Air injection on both flame dynamics and emissions in the reacting case. To reveal dependencies of Cooling Air injection on combustion stability and NOx emissions, the amount of injected Cooling Air is varied. OH*-chemiluminescence measurements are applied to characterize the impact of Cooling Air injection on the flame front. Emissions are collected for different Cooling Air concentrations, both global measurements at the chamber exit and local measurements in the region of the flame front close to the burner exit. The effect of Cooling Air injection on pulsation level is investigated by evaluating the dynamic pressure in the combustor. The flame stabilization at the burner exit changes with an increasing degree of dilution with Cooling Air. Depending on the amount of Cooling only a specific share of the additional Air participates in the combustion process.

  • Impact of Cooling Air Injection on the Primary Combustion Zone of a Swirl Burner
    Journal of Engineering for Gas Turbines and Power, 2012
    Co-Authors: A. Marosky, V. Seidel, Thomas Sattelmayer, S. Bless, Fulvio Magni
    Abstract:

    In most dry, low NOx combustor designs, the front panel impingement Cooling Air is directly injected into the combustor primary zone. As this Air partially mixes with the swirling flow of premixed reactants from the burner prior to completion of heat release, it reduces the effective equivalence ratio in the flame and has a beneficial effect on NOx emissions. However, the fluctuations of the equivalence ratio in the flame potentially increase heat release fluctuations and influence flame stability. Since both effects are not yet fully understood, isothermal experiments are made in a water channel, where high speed planar laser-induced fluorescence (HSPLIF) is applied to study the Cooling Air distribution and its fluctuations in the primary zone. In addition, the flow field is measured with high speed particle image velocimetry (HSPIV). Both mixing and flow field are also analyzed in numerical studies using isothermal large eddy simulation (LES), and the simulation results are compared with the experimental data. Of particular interest is the influence of the injection configuration and Cooling Air momentum variation on the Cooling Air penetration and dispersion. The spatial and temporal quality of mixing is quantified with probability density functions (PDF). Based on the results regarding the equivalence ratio fluctuations, regions with potential negative effects on combustion stability are identified. The strongest fluctuations are observed in the outer shear layer of the swirling flow, which exerts a strong suction effect on the Cooling Air. Interestingly, the Cooling Air dilutes the recirculation zone of the swirling flow. In the reacting case, this effect is expected to lead to a decrease of the temperature in the flame-anchoring zone below the adiabatic flame temperature of the premixed reactant, which may have an adverse effect on flame stability.

  • Impact of Cooling Air Injection on the Primary Combustion Zone of a Swirl Burner
    Volume 2: Combustion Fuels and Emissions Parts A and B, 2012
    Co-Authors: A. Marosky, V. Seidel, Thomas Sattelmayer, S. Bless, Fulvio Magni
    Abstract:

    In most dry low NOx combustor designs the front panel impingement Cooling Air is directly injected into the combustor primary zone. As this Air partially mixes with the swirling flow of premixed reactants from the burner prior to completion of heat release it reduces the effective equivalence ratio in the flame and has a beneficial effect on NOx emissions. However, the fluctuations of the equivalence ratio in the flame potentially increase heat release fluctuations and influence flame stability. Since both effects are not yet fully understood isothermal experiments are made in a water channel where high speed planar laser induced fluorescence (HSPLIF) is applied to study the Cooling Air distribution and its fluctuations in the primary zone. In addition the flow field is measured with high speed particle image velocimetry (HSPIV). Both, mixing and flow field are also analyzed in numerical studies using isothermal large eddy simulation (LES) and the simulation results are compared with the experimental data. Of particular interest is the influence of the injection configuration and Cooling Air momentum variation on the Cooling Air penetration and dispersion. The spatial and temporal quality of mixing is quantified with probability density functions (PDF). Based on the results regarding the equivalence ratio fluctuations regions with potential negative effects on combustion stability are identified. The strongest fluctuations are observed in the outer shear layer of the swirling flow, which exerts a strong suction effect on the Cooling Air. Interestingly, the Cooling Air dilutes the recirculation zone of the swirling flow. In the reacting case this effect is expected to lead to a decrease of the temperature in the flame anchoring zone below the adiabatic flame temperature of the premixed reactant, which may have an adverse effect on flame stability.© 2012 ASME