The Experts below are selected from a list of 8136 Experts worldwide ranked by ideXlab platform
Abdallah A. Elsharkawy - One of the best experts on this subject based on the ideXlab platform.
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effects of axial preloading of angular contact ball bearings on the dynamics of a Grinding Machine spindle system
Journal of Materials Processing Technology, 2003Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:Abstract A mathematical model based on a five degrees of freedom dynamic system is utilized to study the effects of axial preloading of angular contact ball bearings on the vibration behavior of a Grinding Machine spindle. The Grinding forces (as a function of Grinding wheel wear rate percentage for five different workpiece materials) were used to simulate external loading on the Grinding Machine spindle. The results show that the initial axial preload applied on the bearings plays a significant role to reduce the vibration levels of the Grinding Machine spindle system and consequently results in better accuracy for the finished surfaces. The vibration levels of Grinding Machine spindle system increases as wheel wear rate percentage increases and/or the hardness of the workpiece material increase. This analysis can be used to calculate the optimum initial axial preload in order to obtain high accuracy for surface finish.
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Effects of axial preloading of angular contact ball bearings on the dynamics of a Grinding Machine spindle system
Journal of Materials Processing Technology, 2003Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:A mathematical model based on a five degrees of freedom dynamic system is utilized to study the effects of axial preloading of angular contact ball bearings on the vibration behavior of a Grinding Machine spindle. The Grinding forces (as a function of Grinding wheel wear rate percentage for five different workpiece materials) were used to simulate external loading on the Grinding Machine spindle. The results show that the initial axial preload applied on the bearings plays a significant role to reduce the vibration levels of the Grinding Machine spindle system and consequently results in better accuracy for the finished surfaces. The vibration levels of Grinding Machine spindle system increases as wheel wear rate percentage increases and/or the hardness of the workpiece material increase. This analysis can be used to calculate the optimum initial axial preload in order to obtain high accuracy for surface finish. © 2002 Elsevier Science B.V. All rights reserved.
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Effect of Grinding forces on the vibration of Grinding Machine spindle system
International Journal of Machine Tools and Manufacture, 2000Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:In this paper the effects of dynamic changes in the Grinding force components due to changes in the Grinding wheel wear flat area and the workpiece material on the vibration behavior of the Grinding spindle are studied. The steady-state dynamics and vibration behavior of the Grinding Machine spindle is simulated by a five degree of freedom model. The results indicate that when Grinding different materials using a Grinding wheel with fixed wear flat area, different vibration behavior is noticed. As the Grinding wheel flat area increases, the level of vibration increases for all the degrees of freedom, which indicates that there is an upper limit for the level of wear on the Grinding wheel that can be tolerated, and after that level dressing operation must be conducted on the Grinding wheel.
Mohammed A. Alfares - One of the best experts on this subject based on the ideXlab platform.
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effects of axial preloading of angular contact ball bearings on the dynamics of a Grinding Machine spindle system
Journal of Materials Processing Technology, 2003Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:Abstract A mathematical model based on a five degrees of freedom dynamic system is utilized to study the effects of axial preloading of angular contact ball bearings on the vibration behavior of a Grinding Machine spindle. The Grinding forces (as a function of Grinding wheel wear rate percentage for five different workpiece materials) were used to simulate external loading on the Grinding Machine spindle. The results show that the initial axial preload applied on the bearings plays a significant role to reduce the vibration levels of the Grinding Machine spindle system and consequently results in better accuracy for the finished surfaces. The vibration levels of Grinding Machine spindle system increases as wheel wear rate percentage increases and/or the hardness of the workpiece material increase. This analysis can be used to calculate the optimum initial axial preload in order to obtain high accuracy for surface finish.
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Effects of axial preloading of angular contact ball bearings on the dynamics of a Grinding Machine spindle system
Journal of Materials Processing Technology, 2003Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:A mathematical model based on a five degrees of freedom dynamic system is utilized to study the effects of axial preloading of angular contact ball bearings on the vibration behavior of a Grinding Machine spindle. The Grinding forces (as a function of Grinding wheel wear rate percentage for five different workpiece materials) were used to simulate external loading on the Grinding Machine spindle. The results show that the initial axial preload applied on the bearings plays a significant role to reduce the vibration levels of the Grinding Machine spindle system and consequently results in better accuracy for the finished surfaces. The vibration levels of Grinding Machine spindle system increases as wheel wear rate percentage increases and/or the hardness of the workpiece material increase. This analysis can be used to calculate the optimum initial axial preload in order to obtain high accuracy for surface finish. © 2002 Elsevier Science B.V. All rights reserved.
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Effect of Grinding forces on the vibration of Grinding Machine spindle system
International Journal of Machine Tools and Manufacture, 2000Co-Authors: Mohammed A. Alfares, Abdallah A. ElsharkawyAbstract:In this paper the effects of dynamic changes in the Grinding force components due to changes in the Grinding wheel wear flat area and the workpiece material on the vibration behavior of the Grinding spindle are studied. The steady-state dynamics and vibration behavior of the Grinding Machine spindle is simulated by a five degree of freedom model. The results indicate that when Grinding different materials using a Grinding wheel with fixed wear flat area, different vibration behavior is noticed. As the Grinding wheel flat area increases, the level of vibration increases for all the degrees of freedom, which indicates that there is an upper limit for the level of wear on the Grinding wheel that can be tolerated, and after that level dressing operation must be conducted on the Grinding wheel.
Dai Gil Lee - One of the best experts on this subject based on the ideXlab platform.
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Design and manufacture of a three-axis ultra-precision CNC Grinding Machine
Journal of Materials Processing Technology, 1997Co-Authors: Hyun Surk Kim, Kwang Seop Jeong, Dai Gil LeeAbstract:A three-axis CNC Grinding Machine tool for the ultra-precision mirror surface Grinding of advanced materials such as ceramics and other hard and brittle materials has been designed. The Grinding Machine is composed of the air spindle, a high-damping resin concrete bed, and a three-axis CNC controller with high resolution AC servo motors.\nFor the stiffness calculations of the Grinding Machine, a new modeling method for linear motion guides and ball screws using the three dimensional finite-element method was introduced. From comparison of the calculated results with the experimental results, it was found that the modeling method gives accurate results in the prediction of the stiffness of Machine tools.\nBased on the results, a prototype three-axis CNC Grinding Machine was designed and manufactured. To investigate the dynamic properties of the Grinding Machine, the natural frequencies and damping of the spindle and the headstock were measured experimentally. Also, the mode shape of the Machine tool x-table at the first natural frequency was obtained experimentally.\nFrom the Grinding operation of ceramic materials, it was found that the prototype Grinding Machine tool produced mirror surfaces on aluminum oxide and titanium carbide, with arithmetic surface roughnesses of less than 50 nm.
Hyun Surk Kim - One of the best experts on this subject based on the ideXlab platform.
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Design and manufacture of a three-axis ultra-precision CNC Grinding Machine
Journal of Materials Processing Technology, 1997Co-Authors: Hyun Surk Kim, Kwang Seop Jeong, Dai Gil LeeAbstract:A three-axis CNC Grinding Machine tool for the ultra-precision mirror surface Grinding of advanced materials such as ceramics and other hard and brittle materials has been designed. The Grinding Machine is composed of the air spindle, a high-damping resin concrete bed, and a three-axis CNC controller with high resolution AC servo motors.\nFor the stiffness calculations of the Grinding Machine, a new modeling method for linear motion guides and ball screws using the three dimensional finite-element method was introduced. From comparison of the calculated results with the experimental results, it was found that the modeling method gives accurate results in the prediction of the stiffness of Machine tools.\nBased on the results, a prototype three-axis CNC Grinding Machine was designed and manufactured. To investigate the dynamic properties of the Grinding Machine, the natural frequencies and damping of the spindle and the headstock were measured experimentally. Also, the mode shape of the Machine tool x-table at the first natural frequency was obtained experimentally.\nFrom the Grinding operation of ceramic materials, it was found that the prototype Grinding Machine tool produced mirror surfaces on aluminum oxide and titanium carbide, with arithmetic surface roughnesses of less than 50 nm.
J. Schaller - One of the best experts on this subject based on the ideXlab platform.
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Grinding Machine / Grinding Machines / new / used
2005Co-Authors: J. SchallerAbstract:We buy and sell new and used Grinding Machines, belt grinders, drill Grinding Machines, double ended Grinding Machines, flat Grinding Machines, edge Grinding Machines, polishing Machines, cylindrical Grinding Machines, universal Grinding Machines, cylinder head Grinding Machines (Grinding Machine, belt grinder, drill Grinding Machine, double ended Grinding Machine, flat Grinding Machine, edge Grinding Machine, polishing Machine, cylindrical Grinding Machine, universal Grinding Machine, cylinder head Grinding Machine)
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cylinder head Grinding Machine / cylinder head Grinding Machines / new / used
2005Co-Authors: J. SchallerAbstract:We buy and sell new and used cylinder head Grinding Machines, segment Grinding Machines (cylinder head Grinding Machine, segment Grinding Machine). (new, used, wanted, buy, sell) (table size, cylinder head, turn, grind, wheel, diameter, hydraulically, surface) (Zanrosso)
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cylindrical Grinding Machine / cylindrical Grinding Machines / new / used
2005Co-Authors: J. SchallerAbstract:We buy and sell new and used cylindrical Grinding Machines (cylindrical Grinding Machine). (new, used, used, buy, sell) (sharpen, approximately, Grinding, center, width, length, outside, rotary arbor, diameter, conventionally, CNC, hydraulically) (Kellenberger, Studer)
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Universal grinder / universal grinders / universal Grinding Machine / new / used
2005Co-Authors: J. SchallerAbstract:We buy and sell new and used universal grinder, universal Grinding Machines (universal grinder, universal Grinding Machine). (new, used, wanted, buy, sell) (table, size, sharpen, conventionally, CNC, circle, sheet, Grinding, wheel, dia) (Haas, Jones Shipman, Kellenberger)
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edge Grinding Machine / edge Grinding Machines / new / used
2005Co-Authors: J. SchallerAbstract:We buy and sell new and used edge Grinding Machines (edge Grinding Machine). (new, used, wanted, buy, sell) (edge, edges, sharpen, Grinding wheel, diameter, chamfer, chamfers) (Christen)
