Papers by Author: Ying Xue Yao

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Authors: Jian Guang Li, Jin Guang Du, Ying Xue Yao
Abstract: This paper explains and demonstrates the machinability of dry and wet machining of SiC particle-reinforced aluminum metal matrix composites based on the experiments. The plunge surface experiments with mill-grinding method under wheel peripheral speed of up to 14.13m/s, feed rate 80mm/min and depth of cutting 50μm were carried out on a vertical CNC milling machine. The comparisons of dry and wet machining on the force composites and surface roughness (Ra) versus material removal volume were studied. The material removal volume was gained with the same machining parameters after an equal period of time. In most cases, the tangential mill-grinding force values are greater in wet machining condition than that in dry condition. But for normal mill-grinding force, the Fn values are much greater in dry machining condition than that in wet condition. And the normal mill-grinding force in wet machining increased quickly with increasing material removal volume. A better surface finish can be produced in dry machining than that produced by wet machining. The surface roughness decreased slowly with the increasing material removal volume and the surface roughness shows an insignificant decreasing trend in wet machining.
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Authors: Dong Gao, Ying Xue Yao, Wing Bun Lee, Chi Fai Cheung
Abstract: Virtual manufacturing (VM) is an emerging technology that provides a digital tool for the optimization of the production efficiency through simulations prior to the start of actual production. A NC program translator is one of the crucial components for virtual machining which allows the simulation and verification of NC tool path before actual machining. In this paper, a framework of a NC program translator for diamond turning of precision optics is presented.
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Authors: Peng Chen, Ping Jun Xia, Yue Dong Lang, Ying Xue Yao
Abstract: Virtual manufacturing technology has become an effective method for decision and planning in manufacturing. Due to ergonomics problems are widely concerned in assembly design planning, a human-centered virtual assembly system framework is proposed for ergonomics analysis for assembly operation in this paper. The six-layer framework integrates virtual human modeling, motion capture and recognition, ergonomics evaluation and virtual assembly process planning as an organic whole. Data exchanging and system function are discussed based on this framework. The work in virtual reality (VR) technology, motion capture technology, ergonomics method and optimization method for implementing the system is also described. The framework would provide a new approach for the combination of virtual manufacturing and ergonomics analysis in the future.
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Authors: Ying Xue Yao, Y. Lu, Zhe Jun Yuan, J.Y. Hu
Abstract: This paper introduces a new hybrid model for tool condition monitoring (TCM) and optimal tool management (OTM) in end milling operation. The model includes a wavelet fuzzy neural network with acoustic emission (AE) and a model of fuzzy classification of tool wear state with the detected cutting parameters supported by cutting database. The results estimated by cutting conditions and detected signals are fused by artificial neural network (ANN) so as to facilitate effective tool replacement at a proper state or time. The validity and reliability of the method are verified by experimental results.
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Authors: Ying Xue Yao, Chang Qing Liu, Jian Guang Li, H.J. Jing, S.D. Chen
Abstract: Traditional adaptive control technologies in machining process optimization are limited in applications because they depend much on sensors, controllers and other hardware. An off-line optimization method for end milling process with constant cutting power is presented. On taking advantage of virtual machining which simulates milling process, acquires cutting parameters and predicts cutting forces, method taking constant cutting power as an objective is discussed to optimize feed rates and cutting speeds. Based on optimal result, the feed rates and spindle revolutions in NC program are re-scheduled. Controlled milling experiments show that machining time is reduced and machining stability is improved by using the optimized NC program.
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Authors: Miao Liu, Ying Xue Yao, Liang Zhou
Abstract: A tool path planning algorithm that generates contour-parallel tool paths for 2D pockets is proposed. 2D pockets with islands bounded by line and arc segments can be handled. The algorithm first generates raw offset loops by vertex offset, then based on the concepts of offset region and invalid edge, local invalid edges are removed. By the character of direction vectors at the intersections of offset tool paths, the invalid sup-loops are removed. The offset tool paths are linked by depth-first traversal algorithm after constructing a single-parent tree. Experimental results are given to verify the proposed algorithm.
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Authors: G.H. Liu, Ying Xue Yao, S. Zhang
Abstract: With the analysis of assembly course of some large-scale products, a new man-machine interactive system for virtual assembly of such products that can realize the operator’s free walking is put forward. The system architecture and key techniques involved are explored and some research results in advance are also supplied.
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Authors: Jia Feng Wu, Dong Gao, Ying Xue Yao
Abstract: A position-finding method for machining huge workpiece is presented in this paper, and the principle of intelligent position-finding machining system is proposed. Based on automatic determining the position and orientation of the fixed workpiece frame relative to the movable machine-tool frame, the position-finding model is erected and solved by modified Euler angle and Hong-Tan algorithm. The theoretical analysis and simulation examples demonstrate the validity of the proposed method, and the results indicate that the method is suitable for machining huge workpiece in significant scientific projects.
370
Authors: Ying Xue Yao, Shun Zhou Yu
Abstract: PC-based software computer numerical control (CNC) system is the ideal for open CNC system, but there are some problems about the current open CNC system, such as the limitation of interpolation cycle, demanding on high-speed and high precision machining and the limitation of operation system (OS). So advances a novel PC-based architecture for compiled-type software CNC system, in the architecture, the general Windows is adopted as CNC platform and adopts two huge memories acting as data buffer to solve real time problem. And then analyzes the structure and basic principle of compiling system. The hardware has been developed based on this architecture and applied in the CNC system.
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Authors: Zhi Peng Tang, Ying Xue Yao, Liang Zhou, Bo Wen Yu
Abstract: This paper summarizes the research results of the structural parameters which have effects on the performance of Savonius wind turbine. Savonius wind turbine being used in wind power and tidal power belongs to vertical axis wind turbine (VAWT). Recently, more and more research have placed on it for its advantages such as: being able to accept wind from any direction, long fatigue life of the blades, high starting torque, wide working wind speed range, easy to install, manufacture and maintain and low noise etc. The performance of Savonius wind turbine is affected by many factors. Different structural parameters can bring huge differences in turbine performance. Especially the differences in the maximum wind energy utilization (Cp-max) can be more than 30% with different structure. Many new turbines get higher Cp-max by improving the structural parameters. In this paper, the structural improvement information of Savonius wind turbine is summarized in order to provide useful knowledge for the researchers in the structural design and improvement.
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