The Experts below are selected from a list of 3156 Experts worldwide ranked by ideXlab platform
R L Wang - One of the best experts on this subject based on the ideXlab platform.
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A new kinematics for ultra precision grinding of conical surfaces using a Rotary Table and a cup wheel
International Journal of Machine Tools & Manufacture, 2012Co-Authors: G Feng, Renke Kang, R L WangAbstract:Abstract This paper reports a new kinematics for ultra precision grinding of conical surfaces. It uses a Rotary Table and a cup wheel to perform an infeed grinding. Its principle is that the generating curve of the grinding wheel is locally flat and the locally flat portion can be approximated by a sloping line segment if the machine configuration parameters such as the wheel radius, the center distance between the Rotary Table and the wheel, the wheel inclination angle and the Rotary Table direction angle are properly selected. A model for the conicity error of the generated surface was developed. An algorithm for the selection of the desired values of the machine configuration parameters to grind conical surfaces was proposed. It was found that the minimum theoretical conicity error is extremely small for narrow conical surface or conical surface with shallow radial inclination angle. It is expected to be an efficient method to manufacture the conical surfaces of machine parts, mechanical sealing components and optical devices with high form accuracy, low surface roughness and low subsurface damage.
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A new kinematics for ultra precision grinding of conical surfaces using a Rotary Table and a cup wheel
International Journal of Machine Tools and Manufacture, 2012Co-Authors: F. W. Huo, R.-K. Kang, D. M. Guo, G Feng, R L WangAbstract:This paper reports a new kinematics for ultra precision grinding of conical surfaces. It uses a Rotary Table and a cup wheel to perform an infeed grinding. Its principle is that the generating curve of the grinding wheel is locally flat and the locally flat portion can be approximated by a sloping line segment if the machine configuration parameters such as the wheel radius, the center distance between the Rotary Table and the wheel, the wheel inclination angle and the Rotary Table direction angle are properly selected. A model for the conicity error of the generated surface was developed. An algorithm for the selection of the desired values of the machine configuration parameters to grind conical surfaces was proposed. It was found that the minimum theoretical conicity error is extremely small for narrow conical surface or conical surface with shallow radial inclination angle. It is expected to be an efficient method to manufacture the conical surfaces of machine parts, mechanical sealing components and optical devices with high form accuracy, low surface roughness and low subsurface damage. © 2012 Elsevier Ltd. All rights reserved.
Masaomi Tsutsumi - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Motion Characteristics of High Performance CNC Rotary Tables
Volume 3: Design and Manufacturing Parts A and B, 2010Co-Authors: Muditha Dassanayake, Masaomi TsutsumiAbstract:In this paper, the motion performances of the two Rotary Tables which are driven by roller gear cam and direct drive motor are measured and compared. The Table with roller gear cam was controlled in semi-closed loop and full-closed loop methods while the other was controlled only in full-closed loop method. In the measurements, the positioning accuracy and repeatability, rotational fluctuation, frequency response, step response and etc of the systems were measured. All these tests were carried out without any kind of compensation methods such as pitch error or cogging torque compensation etc. Three Rotary encoders for Rotary Table with roller gear cam and one Rotary encoder for Rotary Table with direct drive motor were used for measurements. Furthermore, the simulations were carried out by mathematical models and the results were compared with measured results. The comparison shows that the measured and simulated results have a good agreement. From the simulation results, the friction torque was identified and also compared. The results imply that though both the Tables show high performances, the performances of the Rotary Table driven by roller gear cam are comparatively higher than that of Rotary Table driven by direct drive motor.Copyright © 2010 by ASME
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High Performance Rotary Table for Machine Tool Applications
International journal of automation technology, 2009Co-Authors: K. M. Muditha Dassanayake, Masaomi TsutsumiAbstract:The high performance Rotary Tables are immense necessary part for the multi-axis machines. These Rotary Tables are yet in the developing stage. In this report, a Rotary Table driven by roller drive is introduced and the characteristics of that are discussed by comparing them with the characteristics of Rotary Table driven by worm gear mechanism. As the characteristics, the positioning accuracy and repeatability, frequency response, rotational fluctuations and influence of unbalance mass on motion are measured. According to the measured results, it can be said that the Rotary Table driven by roller drive shows high performances and therefore it can be said that this type of Rotary Tables are well suited for machine tool applications.
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evaluation of synchronous motion in five axis machining centers with a tilting Rotary Table
Journal of Advanced Mechanical Design Systems and Manufacturing, 2007Co-Authors: Masaomi Tsutsumi, Daisuke Yumiza, Keizo Utsumi, Ryuta SatoAbstract:This paper proposes a new method for evaluating the synchronous inaccuracy of a translational axis and a rotational axis in five-axis controlled machining centers with a tilting Rotary Table. A circular trajectory whose shape is easy to evaluate the specific features is adopted for measuring the circular path described by the two axes. The influence of inaccurate synchronization on the circular path was simulated by changing the distance between the centers of the Rotary Table and the circular path, the radius of the circular path and the feed speed. Measurement conditions were determined based on the simulation results, and then ball bar measurements and machining experiments were conducted. From the simulation and experimental results, it is confirmed that the proposed method can be used for evaluating the inaccurate synchronization of a translational axis and a rotational axis. However, careful alignment of the center of the rotational axis and the machine coordinate origin is important for evaluating the synchronous accuracy. The ratio of the distance between both centers of the rotational axis and the circular path to the radius provides useful information for the evaluation.
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identification of angular and positional deviations inherent to 5 axis machining centers with a tilting Rotary Table by simultaneous four axis control movements
International Journal of Machine Tools & Manufacture, 2004Co-Authors: Masaomi Tsutsumi, Akinori SaitoAbstract:This paper describes a method for identifying the eight deviations inherent to five axis control machining centers by means of simultaneous four-axis control movements. Some methods to identify the deviations have been proposed. However, a simultaneous four-axis control technique using a ball bar instrument has not been applied to the measurement of relative displacements between the main spindle and the workTable. Furthermore, the method for assessing the deviations from the trajectories has not been proposed. Thus, in this paper, a calibration method based on the simultaneous four-axis control technique is proposed for five axis control machining centers with a tilting Rotary Table. To confirm the validity of the proposed method, simulations were conducted. The trajectories were obtained by means of a mathematical model into which the eight deviations were substituted. In the first step, four of the eight deviations were estimated by an observation equation for which two measurement trajectories and six reference ones were used. In the second step, the remaining four deviations were geometrically calculated using the values estimated by the observation equation. As a result, it was found that the proposed method was sufficient to identify the deviations accurately.
G Feng - One of the best experts on this subject based on the ideXlab platform.
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Generation of rotationally symmetric surfaces by infeed grinding with a Rotary Table and a cup wheel
Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2013Co-Authors: Zhe Li, G Feng, Renke KangAbstract:Abstract In infeed grinding with a Rotary Table and a cup wheel, the wheel radius, the center distance between the Rotary Table and the cup wheel, the wheel inclination angle and the Rotary Table direction angle can be actively chosen. This makes it capable of generating a rich family of rotationally symmetric surface shapes with high accuracy, high surface finish and high surface integrity in a cost effective way. However, its application has long been confined to silicon wafers flattening and thinning. In this study, the theoretical basis for the rotationally symmetric surface generation by this grinding method was developed. The possible shape types of the generating curves and the substantial influence of the machine configuration parameters on their shape characteristics were analyzed. It was found that, besides flat surface, it can be used to generate straight conical surface, convex conical surface, concave conical surface, convex to concave conical surface, concave to convex conical surface, convex to concave to convex conical surface and concave to convex to concave conical surface.
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A new kinematics for ultra precision grinding of conical surfaces using a Rotary Table and a cup wheel
International Journal of Machine Tools & Manufacture, 2012Co-Authors: G Feng, Renke Kang, R L WangAbstract:Abstract This paper reports a new kinematics for ultra precision grinding of conical surfaces. It uses a Rotary Table and a cup wheel to perform an infeed grinding. Its principle is that the generating curve of the grinding wheel is locally flat and the locally flat portion can be approximated by a sloping line segment if the machine configuration parameters such as the wheel radius, the center distance between the Rotary Table and the wheel, the wheel inclination angle and the Rotary Table direction angle are properly selected. A model for the conicity error of the generated surface was developed. An algorithm for the selection of the desired values of the machine configuration parameters to grind conical surfaces was proposed. It was found that the minimum theoretical conicity error is extremely small for narrow conical surface or conical surface with shallow radial inclination angle. It is expected to be an efficient method to manufacture the conical surfaces of machine parts, mechanical sealing components and optical devices with high form accuracy, low surface roughness and low subsurface damage.
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A new kinematics for ultra precision grinding of conical surfaces using a Rotary Table and a cup wheel
International Journal of Machine Tools and Manufacture, 2012Co-Authors: F. W. Huo, R.-K. Kang, D. M. Guo, G Feng, R L WangAbstract:This paper reports a new kinematics for ultra precision grinding of conical surfaces. It uses a Rotary Table and a cup wheel to perform an infeed grinding. Its principle is that the generating curve of the grinding wheel is locally flat and the locally flat portion can be approximated by a sloping line segment if the machine configuration parameters such as the wheel radius, the center distance between the Rotary Table and the wheel, the wheel inclination angle and the Rotary Table direction angle are properly selected. A model for the conicity error of the generated surface was developed. An algorithm for the selection of the desired values of the machine configuration parameters to grind conical surfaces was proposed. It was found that the minimum theoretical conicity error is extremely small for narrow conical surface or conical surface with shallow radial inclination angle. It is expected to be an efficient method to manufacture the conical surfaces of machine parts, mechanical sealing components and optical devices with high form accuracy, low surface roughness and low subsurface damage. © 2012 Elsevier Ltd. All rights reserved.
F. W. Huo - One of the best experts on this subject based on the ideXlab platform.
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A new kinematics for ultra precision grinding of conical surfaces using a Rotary Table and a cup wheel
International Journal of Machine Tools and Manufacture, 2012Co-Authors: F. W. Huo, R.-K. Kang, D. M. Guo, G Feng, R L WangAbstract:This paper reports a new kinematics for ultra precision grinding of conical surfaces. It uses a Rotary Table and a cup wheel to perform an infeed grinding. Its principle is that the generating curve of the grinding wheel is locally flat and the locally flat portion can be approximated by a sloping line segment if the machine configuration parameters such as the wheel radius, the center distance between the Rotary Table and the wheel, the wheel inclination angle and the Rotary Table direction angle are properly selected. A model for the conicity error of the generated surface was developed. An algorithm for the selection of the desired values of the machine configuration parameters to grind conical surfaces was proposed. It was found that the minimum theoretical conicity error is extremely small for narrow conical surface or conical surface with shallow radial inclination angle. It is expected to be an efficient method to manufacture the conical surfaces of machine parts, mechanical sealing components and optical devices with high form accuracy, low surface roughness and low subsurface damage. © 2012 Elsevier Ltd. All rights reserved.
Haiqun Qi - One of the best experts on this subject based on the ideXlab platform.
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A new approach for determining the contact indentation of the wire race ball bearing in a three-axis simulating Rotary Table
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Xiaobiao Shan, Jiangbo Yuan, Tao Xie, Haiqun QiAbstract:This paper developed a new approach to determine the contact indentation between the wire and the ball in the wire race ball bearing with a diameter of 1000 mm used in a missile simulating Rotary Table. The material nonlinearity and geometric nonlinearity was considerer in the contact analysis by using the real stress-strain curve of the wire race tested on an Instron-5569 universal electron tension tester. The results obtained by our approach are in good agreement with the analytical results and the experimental results. The feasibility of the current approach is verified. This work contributes to controlling the preload of the wire race ball bearing and improving the servo control accuracy of the system.
