Papers by Author: Xi Feng Fang

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Authors: Sheng Wen Zhang, T.X. Lan, Xi Feng Fang, W. Jia, C.Q. Yang
Abstract: Tool selection is the important content of CAPP, and a great many influence factors and selection principles must be considered during tool selection. For the unreasonable phenomenon during tool selection and usage in present manufacturing enterprise, first the rule reasoning and fuzzy theory method are used to select proper tool set according to the processing conditions, then grey correlation analysis method is used to calculate the weight value of each tool and compare superiority of the these tools, and the best tool in existing conditions is obtained. Grey theory is used in tool selection to work out the problem of insufficient and incomplete information in the process of tool selection, and the cumbersome factors are simplified, the accuracy and efficiency of tools selection are improved. The research result has all-right reference meaning to other decision-making systems.
Authors: Sheng Wen Zhang, Chan Yuan Gong, Xi Feng Fang, C.S. Zhu, W. Jia
Abstract: Some key techniques such as material constitutive model, friction characteristics at tool-chip interface were discussed. And the constitutive equation for nodular cast iron 500-7 was established. Then the simulation software DEFORM-2D was used to simulate the orthogonal cutting process. Finally, the influences of cutting parameters and tool geometries on cutting forces, cutting temperature and chip morphology were analyzed. This study provides some academic support to the optimization of cutting parameters for nodular cast irons.
Authors: Sheng Wen Zhang, Chan Yuan Gong, Xi Feng Fang, Gui Cheng Wang
Abstract: The effect of cutting tool geometry on cutting process is very prominent and cannot be ignored, especially the interactions between tool geometries. In this study, the effects of the rake angle, the clearance angle, the cutting edge radius and the interaction between rake angle and clearance angle on cutting force and cutting temperature are numerically investigated using finite element method. Four-factor three-lever orthogonal experimental design is adopted in the finite element simulation of orthogonal cutting process. An analysis of range is performed to identify significant trends in the cutting force and cutting temperature and the optimal level values of each factor. The result shows that the effect of the rake angle on cutting force is significant. The effect of interaction between rake angle and clearance angle on cutting temperature also appeared to be important. Finally, the optimal parameter combinations of tool geometries for cutting force and cutting temperature are obtained, respectively.
Authors: Sheng Wen Zhang, Yang Liu, Xi Feng Fang, Gui Cheng Wang
Abstract: A reasonable process route is important for assuring the product quality and improving the production efficiency. This paper analyzes the sequencing essence of box part working step,and on the basis of deducting the concept of “Inner Product Angle Cosine of n Dimension Vector”, this paper advances a new algorithm called as “Inner Product Angle Cosine of n Dimension Vector” to sequence the working procedure. Through analyzing the algorithm flow and combining with the example used to demonstrate it, this algorithm is proved to own a more reasonable math theory basis, an overall optimization character and a stable convergence character in a more strict sense.
Authors: Xi Feng Fang, Chun Qiao Wu, Sheng Wen Zhang, W. Jia, C.Q. Yang, Y.H. Tong
Abstract: In order to choose milling parameters quickly, reasonably and improve milling quality, avoid vibration in milling frame part of marine diesel engine, combining the development trend of milling technology, the dynamic model for milling the guide plate surface of frame part is built, the experiment modal parameters of spindle-holder with a cutting tool and the guide plate surface are identified. Using dynamic forces and chatter lobes to build constraint conditions, so as to recommend process parameters, which can show guidance to mill the guide plate surface of frame part. Consequently, parameters choosing lied on traditional try cutting is avoided, processing cost is reduced and the chatter free material removal rate (MRR) is improved.
Authors: Shi Jie Su, Xi Feng Fang, Fang Li
Abstract: Mechanical products have been inevitably disassembled when they are regarded to be recycled or repaired. The disassembling procedure must be decided no matter what way is used to disassemble. The key is to decide the disassembly sequence for parts/components. In order to generate the disassembly sequence rapidly and correctly, similar thread binary tree and graph algorithm are used to establish the model of disassembly after analyzing the characteristics of Mechanical products. Firstly, generate the related matrix obtained from the 3D CAD assembly model; secondly, transform the undirected graph to the directed graph based on the practical constraints between parts/components; finally, search the restrictions among the directed graph and generate the efficient disassembly sequence. A prototype system of disassembly sequence planning based on UG was implemented which has the functions such as parts and assembly information extraction, definition constraints between components, disassembly sequence planning and etc. The centrifugal lubricating oil filter case study proves the validity and feasibility of the proposed method.
Authors: Xi Feng Fang, T.X. Lan, Sheng Wen Zhang, W. Jia, Tong Yue Wang
Abstract: Rule-based reasoning (RBR) and weight decision making have been widely used in a lot of decision support systems. According to the waste phenomenon of manufacturing corporations due to the reasonless use of tools during production process, and considering the characteristics of former tool selection systems, develop a tool optimal selection system with Visual Basic 6.0 as development tool and SQL Server 2000 as database developing platform. The system adopts the rule-based reasoning and weight decision-making theory, combines fuzzy theory, artificial intelligent technology and production conditions of corporations. According to the information of workpiece and processing conditions imported by users, the system can select the reasonable tools for users. The system overcomes the limitation of single theory tool selection system, simplifies reasoning mechanism and structure of knowledge base, makes programmer easy to realize, promotes operation efficiency of system, and raises the accuracy and efficiency of tool selection in actual production. A developed prototype system and an example have verified some presented techniques and the research results are the basis of the future development.
Authors: Xi Feng Fang, Sheng Wen Zhang, Chan Yuan Gong, T.X. Lan
Abstract: In the manufacturing of diesel engine, cutting machining is the main processing method. In order to improve efficiency and increase benefit of machining, the cutting database and parameter optimization system is built for the five key parts of marine ship diesel engine, which can provide optimal and rational cutting parameters. Microsoft Visual Basic and Microsoft SQL Server 2000 are used as the database management system, combining the modeling function of Deform 5.03 software. The logical and physical models are designed, and the functions of basic information management and query are realized. It can commend reasonable cutting parameters according to machining condition input. The Weilenmann algorithm method is adopted to calculate the cutting force and motor power, and user can be convenient to judge whether the parameter input is safe and reasonable. The objective function and restrictive conditions are set up by using the simplex method and linear programming, and the optimization function of cutting parameters is realized. A developed prototype system and an example have verified some presented techniques and the research results are the basis of the future development.
Authors: Xi Feng Fang, Sheng Wen Zhang, H.T. Wu, Y.P. Lu
Abstract: In order to improve the modeling efficiency of the industrial robot dynamics control, the recursive dynamics is studied based on the Spatial Operator Algebra (SOA) theory, and the procedure realization is built in the environment of Matahematica6.0 software. The high effective recursive forward and reward dynamics for the SOA theory, has a simple math expression and a clear physical meaning. The software structure of the forward and inverse dynamics is built and the industrial robot dynamics simulation model is realized based on the integrated procedure VB.NET and Mathematica 6.0. According to the analysis, the example of PUMA560 robot forward and inverse dynamics is studied, and correctness and validity is verified by computed examples.
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