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Real-time Synchronization Method Based on Dual Ring Fieldbus in cnc system

Chinese Journal of Mechanical Engineering 2014年第1期27卷 111-121页

作者： YANG Lei LIN Hu ZHENG Liaomo YUE Dongfeng GAO Tianrong WANG Feng School of Computer Science and Technology University of Science and Technology of China Shenyang Institute of Computing Technology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

As the popularization of dual ring fieldbus, the optimized dual ring synchronization methods are still in short. The current synchronization methods are generally established in traditional industrial fieldbus, in which transmission is commonly considered in single track, the two-way transmitting cannot take full effect, and would result in unwanted idle load on equipment lines. In stamp-transferring part, the synchronizing algorithm is not properly processed to diminish the latency, so the real-time performance of entire system cannot be ensured. To support the synchronization control of stations in the cnc system, a real-time time synchronization method for dual ring fieldbus in the cnc system is designed in this paper. In this method a synchronizing message transmission scheme based on dual ring architecture and the synchronization algorithm between master and secondary stations are integrated. In the scheme, the clock models of both master and secondary stations are optimized with corresponding modules and the stamp data transmission based on the dual ring fieldbus is devised exclusively, so the transmitting efficiency improves with less idle work. In the algorithm, all the secondary stations can accomplish the consistent state with master station by updating clock discrepancy information in one communication cycle, and it takes the advantage of two-way transmitting and makes the best use of dual ring structure, so the real-time performance of the system can be promoted while retaining the precision of synchronization. To evaluate the performance, the costs of the method and errors during synchronizing are noted and analyzed based on the actual running environment in the industrial fieldbus. The results show that it reduces communication cost and ensures the smoothness of the system with low lag effects under heavy load. The proposed time synchronization method optimizes the architecture of sync message transmission in dual ring fieldbus, and improves the effici

关键词： time synchronization dual ring fieldbus real-time system cnc system

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维普期刊数据库

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Time between failures model and failure analysis of cnc system

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Journal of Harbin Institute of Technology(New Series) 2007年第2期14卷 197-201页

作者：张海波贾亚洲周广文 Dept. of Mechanism and Electronics Northeast China Institute of Electric Power Engineering College of Mechanical Science and Engineering Jilin University

To provide basis for the reliability improvement design of cnc system, the failure data of a type of cnc system in one year are collected under field conditions in workshops. The distribution model parameters of time between failures are estimated by least square method and hypothesis testing is done by d-test method. It is proved that the time between failures of the cnc system follows Weibull distribution and the system has entered into the wear-out failure period. The failure positions and failure causes are analyzed further to indicate the weak subsystems of the cnc system. It can be found that servo unit, electrical system, detecting unit and power supply are principal failure positions and the main failure cause is breakage of components. The corresponding improvement measures are put forward. The paper provides a reference to reliability design and analysis of cnc system for the manufacturer and has great guidance to using and maintaining cnc system for the user.

关键词： cnc system failure analysis reliability Weibull distribution

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Development of an E-maintenance system for a cnc system

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International Journal of Plant Engineering and Management 2007年第4期12卷 181-191页

作者： LAI Hong HE Ling-song TANG Li-xin National NC system Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 P. R. China

Globalization and rapid growth of network technologies have changed the traditional patterns of device maintenance. E-maintenance has emerged and is widely used in many manufacturing systems. In this paper, a new architecture of an E-maintenance system is proposed, which consists of E-maintenance centre, embedded cnc gateway and cnc terminal. The E-maintenance centre provides the technical support and service for customers based on Internet and communication technologies. The embedded cnc gateway serves as an agent between the public and plant device network, and provides web-based access for the cnc system. A reconfigurable cnc terminal is highly desired in a signal measuring and analysing system, which is built on the top of component and software bus based models. Finally, the E-maintenance system for the cnc machine is implemented and the experiments show that the architecture of an E-maintenance system can effectively reduce the downtime of devices, the responding time of maintenance work, and increase both the quality and the productivity of enterprises.

关键词： E-maintenance cnc system remote fault diagnosing

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Cam Profile Grinding cnc system Based on Open Architecture

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International Journal of Plant Engineering and Management 2002年第2期7卷 82-92页

作者： GONG Shi-hua, DUAN Zheng-cheng, ZHU Guo-liCollege of Mechanical Science and Engineering, HuazhongUniversity of Science and Technology, Wuhan 430074,P.R.China College of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

This paper studies some key technologies of cnc system for cam grinding. The mathematical motion model for cam grinding is established according to the harmony of reciprocating motion of the grinding wheel and the rotating motion of the workpiece. The method of using the linear servomotor to accomplish the grinding wheel tracking is developed and the dynamic model of the system is analyzed. Then the cross-coupled biaxial error compensation model is proposed. Finally, the hardware and software of the control system are designed based on open architecture. Some algorithms , such as spline fitting and interpolation for cam contour, velocity control and feed control, are presented to improve grinding precision.

关键词： cam grinding cnc system mathematical model for motion error compensation.

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The cnc system Based on SmarTeam Mechanism and Re-development of Pro/E

The CNC system Based on SmarTeam Mechanism and Re-developmen...

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E-Business·Creative Design·Manufacturing——2009 IEEE 10th International Conference on Computer-Aided Industrial Design & Conceptual Design（CAID&CD’2009）

作者： Bo Hao Li Xu Hui-jing Zhao Shenyang Ligong University Liaoning Province Shenyang 110168

Arming at the characteristics of shrapnel multi-type and variable batch,developing tools Visual C++ 6.0 and Pro/Toolkit are used,the cnc system based on SmarTeam Data Model is put *** management and utilization are carried out which are in the fields of the processing parameter inquiring,experience inquiring and G code of numerical control cutting,milling,drilling,boring and so on by SmarTeam,and then the process and results of the system is demonstrated by taking some shrapnel body cutting for example.

关键词： SmarTeam Re-development of Pro/E cnc system Data management.

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Research on cnc Turning system of Aspheric Machining Grinding Wheel

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Journal of China University of Mining and Technology 2005年第1期15卷 64-67页

作者： ZOUQin GUOYin-biao Departmentofmechanicalandelectricalengineering XiamenUniversityXiamenFujian361005China

The technology of machining aspheric surface with high precision is the premise for the application of aspheric surface. The grinding machining with error compensation is a commonly used method to machine aspheric surface, which will directly influence the quality of aspheric workpiece surface. Multifunctional cnc grinding wheel truing system is a four-axis cnc truing system which can be applied to grinding wheel truing. In this system, DSP-based multi-axes motion control card is adopted as the controller, and visual C++ is used as development tool. When the design of hardware and software is completed, the system can implement truing of various grinding wheel with high precision aspheric machining such as plane grinding wheel, arc grinding one, and sphere grinding one.

关键词： aspheric machining grinding wheel cnc system truing

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cnc Technology in the LOM system

CNC Technology in the LOM System

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第一届国际模具技术会议

作者： Ming Han Yuejia Xiao Lichao Zhang Shuhuai HuangState Key Lab of Die Technology Huazhong University of Science & Technology Wuhan 430074 P.R.China

＜正＞ The cnc technology in LOM system is different from that in conventional machining tool. This paper introduced the PC bus based composition of high precision cnc system for LOM. Emphasis was placed on the key techniques that composed of the cnc system. According to theory of open system structure and characteristics of advanced rapid prototyping technology, an industry PC based multi-microprocessor integrated distributed control system was designed , The good opening nature of the system enables its interchangability and universality. By changing a few different PC bus function block, it can be easily applied to other numerical contro! system.

关键词： LOM(laminated object manufacturing) cnc system CAD/CAM

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Realization of a 5-axis NURBS Interpolation with Controlled Angular Velocity

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Chinese Journal of Aeronautics 2012年第1期25卷 124-130页

作者： LIU Yuan LI Hui WANG Yongzhang School of Astronautics Harbin Institute of TechnologyHarbin 150001China School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China

5-axis machine tool plays an important role in high-speed and high-precision computer numerical control （cnc） machining of workpieces with complex shapes. A non-uniform rational B-spline （NURBS） interpolation format for 5-axis machining is pro- posed to adapt to the high speed machining （HSM）. With this interpolation format, angles between orientation vectors are chosen as parameters of orientation B-spline constructed by an open controller to achieve reasonable orientation vectors in real-time interpolation process. Coordinated motion between linear axes and rotary axes is achieved by building a polynomial spline which relates interpolation arc lengths of position spline to angles of orientation spline. Algorithm routine of this interpolation format and its realization methods in the supported controller are discussed in detail. Finally, performance of the proposed NURBS in- terpolation format is demonstrated by a practical example.

关键词： cnc system sculptured surface motion control NURBS interpolation multi-axis machining

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DEVELOPMENT OF A cnc MICRO-EDM MACHINE

DEVELOPMENT OF A CNC MICRO-EDM MACHINE

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： GUO Rui*, ZHAO Wansheng, LI Gang *School of Mechanical Engineering, Harbin Institute of Technology, 92 West Da-Zhi Street, Harbin 150001, China School of Mechanical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China

Micro-EDM has been a key technology for micro-machining because of the high precision and good surface quality that it can achieve. However, a number of issues remain to be solved before micro-EDM can

关键词： Micro-EDM cnc system machine vision system Linux.

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Study on the principle and method of interpolation algorithm for a new type parallel machine tool

Study on the principle and method of interpolation algorithm...

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第五届海内外青年设计与制造科学会议

作者： Fan Shouwen Xu Liju (Sichuan University)

＜正＞A structure configuration scheme for a new type parallel machine tool（PMT） is proposed in this paper. In this scheme, a 4dof spatial parallel mechanism is utilized as main feed mechanism, with assistance of a two direction movable worktable, multi-coordinates NC machining can be realized. Scheme of cnc system for this type PMT is designed. Interpolation strategy which combine coarse interpolation with the fine interpolation is proposed. Surface direct interpolation algorithm which is composed of cutter trajectory calculation, inverse displacement analysis, inverse velocity analysis and PVT fine interpolation mode is established. This research work lay a theory and technology foundation for cnc system of this new type PMT.

关键词： Parallel machine tool. Virtual axis machine tool Interpolation cnc system

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