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Bayesian zero-failure reliability modeling and assessment method for multiple numerical control(NC) machine tools 被引量:2
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作者 阚英男 杨兆军 +3 位作者 李国发 何佳龙 王彦鹍 李洪洲 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第11期2858-2866,共9页
A new problem that classical statistical methods are incapable of solving is reliability modeling and assessment when multiple numerical control machine tools(NCMTs) reveal zero failures after a reliability test. Thus... A new problem that classical statistical methods are incapable of solving is reliability modeling and assessment when multiple numerical control machine tools(NCMTs) reveal zero failures after a reliability test. Thus, the zero-failure data form and corresponding Bayesian model are developed to solve the zero-failure problem of NCMTs, for which no previous suitable statistical model has been developed. An expert-judgment process that incorporates prior information is presented to solve the difficulty in obtaining reliable prior distributions of Weibull parameters. The equations for the posterior distribution of the parameter vector and the Markov chain Monte Carlo(MCMC) algorithm are derived to solve the difficulty of calculating high-dimensional integration and to obtain parameter estimators. The proposed method is applied to a real case; a corresponding programming code and trick are developed to implement an MCMC simulation in Win BUGS, and a mean time between failures(MTBF) of 1057.9 h is obtained. Given its ability to combine expert judgment, prior information, and data, the proposed reliability modeling and assessment method under the zero failure of NCMTs is validated. 展开更多
关键词 Weibull distribution reliability modeling BAYES zero failure numerical control(nc) machine tools Markov chain Monte Carlo(MCMC) algorithm
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METHOD FOR SUPPRESSING CUTTING CHATTER IN NUMERICAL CONTROL MACHINE TOOLS
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作者 孙宝寿 黄筱调 +3 位作者 顾伯勤 方成刚 丁文政 魏韬 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第2期108-114,共7页
A new method for suppressing cutting chatter is studied by adjusting servo parameters of the numerical control (NC) machine tool and controlling the limited cutting width. A model of the cutting system of the NC mac... A new method for suppressing cutting chatter is studied by adjusting servo parameters of the numerical control (NC) machine tool and controlling the limited cutting width. A model of the cutting system of the NC machine tool is established. It includes the mechanical system, the servo system and the cutting chatter system. Interactions between every two systems are shown in the model. The cutting system stability is simulated and relation curves between the limited cutting width and servo system parameters are described in the experiment. Simulation and experimental results show that there is a mapping relation between the limited cutting width and servo parameters of the NC machine tool, and the method is applicable and credible to suppress chatter. 展开更多
关键词 numerical control machine tool chatter servo parameter limited cutting width
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Bayesian networks modeling for thermal error of numerical control machine tools 被引量:7
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作者 Xin-hua YAO Jian-zhong FU Zi-chen CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第11期1524-1530,共7页
The interaction between the heat source location, its intensity, thermal expansion coefficient, the machine system configuration and the running environment creates complex thermal behavior of a machine tool, and also... The interaction between the heat source location, its intensity, thermal expansion coefficient, the machine system configuration and the running environment creates complex thermal behavior of a machine tool, and also makes thermal error prediction difficult. To address this issue, a novel prediction method for machine tool thermal error based on Bayesian networks (BNs) was presented. The method described causal relationships of factors inducing thermal deformation by graph theory and estimated the thermal error by Bayesian statistical techniques. Due to the effective combination of domain knowledge and sampled data, the BN method could adapt to the change of running state of machine, and obtain satisfactory prediction accuracy. Ex- periments on spindle thermal deformation were conducted to evaluate the modeling performance. Experimental results indicate that the BN method performs far better than the least squares (LS) analysis in terms of modeling estimation accuracy. 展开更多
关键词 Bayesian networks (BNs) Thermal error model numerical control (nc machine tool
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Research on Remote Monitoring and Fault Diagnosis Technology of Numerical Control Machine 被引量:1
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作者 ZHANG Jianyu~1 GAO Lixin~1 CUI Lingli~1 LI Xianghui~2 WANG Yingwang~2 1.Key Laboratory.of Advanced Manufacturing Technology,Beijing University of Technology,Beijing 100022,China 2.Tangshan Iron and Steel Corp.LTD,Tangshan 063000,China 《武汉理工大学学报》 CAS CSCD 北大核心 2006年第S2期748-752,共5页
Based on the internet technology,it has become possible to complete remote monitoring and fault diagnosis for the numerical control machine.In order to capture the micro-shock signal induced by the incipient fault on ... Based on the internet technology,it has become possible to complete remote monitoring and fault diagnosis for the numerical control machine.In order to capture the micro-shock signal induced by the incipient fault on the rotating parts,the reso- nance demodulation technology is utilized in the system.As a subsystem of the remote monitoring system,the embedded data acquisi- tion instrument not only integrates the demodulation board but also complete the collection and preprocess of monitoring data from different machines.Furthermore,through connecting to the internet,the data can be transferred to the remote diagnosis center and data reading and writing function can be finished in the database.At the same time,the problem of the IP address floating in the dial-up of web server is solved by the dynamic DNS technology.Finally,the remote diagnosis software developed on the Lab VIEW platform can analyze the monitoring data from manufacturing field.The research results have indicated that the equipment status can be monitored by the system effectively. 展开更多
关键词 numericAL control machine RESONAncE DEMODULATION REMOTE monitoring FAULT diagnosis
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Carbon Emission Modeling and Analysis in Manufacturing Process for Numerical Control Machine Tools
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作者 刘晓龙 刘志杰 +1 位作者 林成新 柏博 《Journal of Donghua University(English Edition)》 EI CAS 2014年第6期827-830,共4页
Reducing carbon emissions( CEs) is the urgent demand all over the world. In order to realize the low-carbon numerical control( NC) machining, the evaluation model of a part's manufacturing carbon emission with NC ... Reducing carbon emissions( CEs) is the urgent demand all over the world. In order to realize the low-carbon numerical control( NC) machining, the evaluation model of a part's manufacturing carbon emission with NC machine tools was built by considering the influences of the cutting tool geometrical parameters.The manufacturing CEs were produced by electric power,cutting tools,and cutting fluid consumed in manufacturing process. The parameters of cutting tools affected not only the CEs,but also the machining quality. Then the actual constraint models of the machine performance,machining quality were given in order to optimize the cutting parameters and achieve the low-CEs. Finally,a case was given to analyze the influences of the cutting tool angles on the manufacturing CEs. The results show that the CEs decrease as the rake angle and edge angle increase under the constraints of the machine specifications and machining quality. 展开更多
关键词 carbon emission(CE) low-carbon manufacturing numerical control(nc) machining cutting tool angle
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Real-Time Data and Visualization Monitoring of Computer Numerical Control Machine Tools Based on Hyper Text Markup Language 5
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作者 WU Yan XIAO Lijun +2 位作者 DING Xiaoying WANG Bing ZHANG Jieren 《Journal of Donghua University(English Edition)》 EI CAS 2019年第3期261-266,共6页
In order to ensure the safety,quality and efficiency of computer numerical control(CNC)machine tool processing,a real-time monitoring and visible solution for CNC machine tools based on hyper text markup language(HTML... In order to ensure the safety,quality and efficiency of computer numerical control(CNC)machine tool processing,a real-time monitoring and visible solution for CNC machine tools based on hyper text markup language(HTML)5 is proposed.The characteristics of the real-time monitoring technology of CNC machine tools under the traditional Client/Server(C/S)structure are compared and analyzed,and the technical drawbacks are proposed.Web real-time communication technology and browser drawing technology are deeply studied.A real-time monitoring and visible system for CNC machine tool data is developed based on Metro platform,combining WebSocket real-time communication technology and Canvas drawing technology.The system architecture is given,and the functions and implementation methods of the system are described in detail.The practical application results show that the WebSocket real-time communication technology can effectively reduce the bandwidth and network delay and save server resources.The numerical control machine data monitoring system can intuitively reflect the machine data,and the visible effect is good.It realizes timely monitoring of equipment alarms and prompts maintenance and management personnel. 展开更多
关键词 computer numerical control(Cnc) machine tools real-time MONITORING VISUALIZATION hyper text MARKUP language(HTML)5 WebSocket CANVAS
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Specialized Numerical Control Plasma Cutting Machine
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《China's Foreign Trade》 1995年第2期36-36,共1页
The large thermal cutting equipment——The DHG. CNC numerical control plasma cutting machine is produced by The Ha’erbin Welding & Cutting Equipment Co. It specializes in the precise formation and baiting of nonf... The large thermal cutting equipment——The DHG. CNC numerical control plasma cutting machine is produced by The Ha’erbin Welding & Cutting Equipment Co. It specializes in the precise formation and baiting of nonferrous boards and thin carbon steel plates at a high speed. It avoids the disadvantage of flame cutting, which cannot cut nonferrous and thin steel plates. 展开更多
关键词 Cnc CO Specialized numerical control Plasma Cutting machine
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An Investigation into the Life Cycle Cost of a Typical Computer Numerical Control Machine
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作者 Liang Gongqian Liu WanxiaSchool of Management Northwestern Polytechnic University Xi’an, 710072, Shaanxi, P.R.China 《International Journal of Plant Engineering and Management》 1997年第2期32-38,共7页
This paper relates to a typical computer numerical control (CNC) machine, model FDXNC 128, and analyzes the payoff period quantitatively and forecasts the future maintenance cost and the evaluation of the economic be... This paper relates to a typical computer numerical control (CNC) machine, model FDXNC 128, and analyzes the payoff period quantitatively and forecasts the future maintenance cost and the evaluation of the economic benefit by using Life Cycle Cost (LCC) method and grey theory. The discussion shows conclusions that are beneficial to the production, management, and decision making of the enterprise. 展开更多
关键词 numerical control machine life cycle cost benefit.
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Method of triangular mesh modeling in numerical control machining simulation
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作者 马志艳 陈幼平 +1 位作者 李建军 赵遥劲 《Journal of Central South University》 SCIE EI CAS 2010年第5期1021-1027,共7页
In the process of numerical control machining simulation,the workpiece surface is usually described with the uniform triangular mesh model.To alleviate the contradiction between the simulation speed and accuracy in th... In the process of numerical control machining simulation,the workpiece surface is usually described with the uniform triangular mesh model.To alleviate the contradiction between the simulation speed and accuracy in this model,two improved methods,i.e.,the local refinement triangular mesh modeling method and the adaptive triangular mesh modeling method were presented.The simulation results show that when the final shape of the workpiece is known and its mathematic representation is simple,the local refinement triangular mesh modeling method is preferred;when the final shape of the workpiece is unknown and its mathematic description is complicated,the adaptive triangular mesh modeling method is more suitable.The experimental results show that both methods are more targeted and practical and can meet the requirements of real-time and precision in simulation. 展开更多
关键词 numerical control machining triangular mesh model SIMULATION
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Heat regulating strategy in numerical control end milling for hard metal machining
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作者 YingTang YoshiakiKakino 《Journal of University of Science and Technology Beijing》 CSCD 2005年第2期187-191,共5页
The trend in die/mold manufacturing at present is towards the hard machining at high speed to replace the electron dis- charge machining. Failure forms of the AlTiN-coated micro-grain carbide endmill when used for th... The trend in die/mold manufacturing at present is towards the hard machining at high speed to replace the electron dis- charge machining. Failure forms of the AlTiN-coated micro-grain carbide endmill when used for the machining of JIS SKD61 (HRC 53), a widely used material in die/mold manufacturing, are investigated. The endmill shows a characteristic that tool life decreases greatly due to the chipping when overload occurs or the rapid increase of wear when over-heat accumulation in cutting edges. As a consequence of the investigation, a strategy to regulate heat generation in the end milling process is proposed. This is accomplished by controlling the cutting arc length, i.e. the length of each flute engaging workpiece in a cutting cycle. Case studies on the slot end milling and comer rounding are conducted. The results show that the proposed strategy suggests the optimal tool path as well as the optimal pitch between successive tool paths under the cutting time criterion. 展开更多
关键词 heat generation: end milling hard metal machining numerical control
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Discussion on Reverse Design of Components with Complex Curved Surface and Computer Numerical Control Machining
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作者 Dapeng Fu Xinyu Lv Shuangyang Jiang 《Journal of Electronic Research and Application》 2018年第4期14-18,共5页
With the continuous development and advancement of science and technology,the work of tool path planning has received extensive attention.Among them,curved surface generation and data processing are the focus of manag... With the continuous development and advancement of science and technology,the work of tool path planning has received extensive attention.Among them,curved surface generation and data processing are the focus of management and design,which necessitate the full application of reverse design of complex curved surface components to complete numerical control processing,effective optimization and upgrading,integration the tasks of point cloud data collection,and point cloud data processing to ensure that the corresponding computer numerical control machining model can exert its actual value.This paper briefly analyzes the basic principles of curved surface reconstruction as well as discusses the reverse design of complex curved components and the experimental processes and results that involved computer numerical control machining,which serves the purpose as reference only. 展开更多
关键词 complex curved surface COMPONENT REVERSE design COMPUTER numericAL control machinING
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CPS Modeling of CNC Machine Tool Work Processes Using an Instruction-Domain Based Approach 被引量:19
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作者 Jihong Chen Jianzhong Yang +5 位作者 Huicheng Zhou Hua Xiang Zhihong Zhu Yesong Li Chen-Han Lee Guangda Xu 《Engineering》 SCIE EI 2015年第2期247-260,共14页
Building cyber-physical system(CPS) models of machine tools is a key technology for intelligent manufacturing. The massive electronic data from a computer numerical control(CNC) system during the work processes of a C... Building cyber-physical system(CPS) models of machine tools is a key technology for intelligent manufacturing. The massive electronic data from a computer numerical control(CNC) system during the work processes of a CNC machine tool is the main source of the big data on which a CPS model is established. In this work-process model, a method based on instruction domain is applied to analyze the electronic big data, and a quantitative description of the numerical control(NC) processes is built according to the G code of the processes. Utilizing the instruction domain, a work-process CPS model is established on the basis of the accurate, real-time mapping of the manufacturing tasks, resources, and status of the CNC machine tool. Using such models, case studies are conducted on intelligent-machining applications, such as the optimization of NC processing parameters and the health assurance of CNC machine tools. 展开更多
关键词 cyber-physical system (CPS) big data computer numerical control (Cnc) machine tool electronic data of work processes instruction domain intelligent machining
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A Windows bitmap-based numerically controlled sculpture method and its application 被引量:5
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作者 邱润生 高永强 《Journal of Shanghai University(English Edition)》 CAS 2008年第1期71-75,共5页
Bitmap (BMP) is a widely used format in image processing. With the combination of the digital image processing and computer numerically controlled (NC) techniques, we developed a bitmap-based NC single-step and mu... Bitmap (BMP) is a widely used format in image processing. With the combination of the digital image processing and computer numerically controlled (NC) techniques, we developed a bitmap-based NC single-step and multi-dot method. An example was provided to illustrate the application and principle of this bitmap-based method in our newly innovated sandblasting glass NC sculpture system. 展开更多
关键词 numerically controlled (nc sculpture device bitmap (BMP) image processing glass sculpture
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Research on cubic polynomial acceleration and deceleration control model for high speed NC machining 被引量:10
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作者 Hong-bin LENG Yi-jie WU Xiao-hong PAN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第3期358-365,共8页
To satisfy the need of high speed NC (numerical control) machining, an acceleration and deceleration (acc/dec) control model is proposed, and the speed curve is also constructed by the cubic polynomial. The proposed c... To satisfy the need of high speed NC (numerical control) machining, an acceleration and deceleration (acc/dec) control model is proposed, and the speed curve is also constructed by the cubic polynomial. The proposed control model provides continuity of acceleration, which avoids the intense vibration in high speed NC machining. Based on the discrete characteristic of the data sampling interpolation, the acc/dec control discrete mathematical model is also set up and the discrete expression of the theoretical deceleration length is obtained furthermore. Aiming at the question of hardly predetermining the deceleration point in acc/dec control before interpolation, the adaptive acc/dec control algorithm is deduced from the expressions of the theoretical deceleration length. The experimental result proves that the acc/dec control model has the characteristic of easy implementation, stable movement and low impact. The model has been applied in multi-axes high speed micro fabrication machining successfully. 展开更多
关键词 High speed nc machining Acceleration and deceleration (acc/dec) control model Cubic speed curve Discrete mathematical model Adaptive acceleration and deceleration control algorithm
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The Innovation of CNC Machine Interface Based on DNC System 被引量:11
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作者 Luo Jianjun Fan Liuqun Liang Gongqian China Research and Education Center of Plant Engineering,Northwestern Polytechnical University Xi’an,710072,P.R.China 《International Journal of Plant Engineering and Management》 1997年第1期50-55,共6页
This paper describes the innovation schemes of the interface of a CNC machine which cannot communicate with a computer by a Direct Numerical Control(DNC)interface and the functions of a DNC interface system.One archit... This paper describes the innovation schemes of the interface of a CNC machine which cannot communicate with a computer by a Direct Numerical Control(DNC)interface and the functions of a DNC interface system.One architecture of hardware and software of a practi- cal single-chip computer based on DNC interface system developed by the authors is given. Without any change of the original hardware and software,this DNC interface system has been used to innovate the CNC machine's interface to implement the direct communication between a computer and a CNC machine and to achieve no tape transmission of a part program and ma- chine parameters.It has been demonstrated that this DNC interface system has certain practical values in improving the reliability,efficiency and production management of CNC/NC machine. 展开更多
关键词 technical innovation Computer numerical control(Cnc) machine Direct numerical control(Dnc) interface single-chip computer
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Effect of mandrel on cross section quality of thin-walled tube numerical controlled bending 被引量:7
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作者 谷瑞杰 杨合 +2 位作者 詹梅 李恒 王光祥 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第6期1264-1274,共11页
The effect of mandrel with the structure of ball and socket on the cross section quality of thin-walled tube numerical controlled(NC) bending was studied by numerical simulation method, combined with theoretical (anal... The effect of mandrel with the structure of ball and socket on the cross section quality of thin-walled tube numerical controlled(NC) bending was studied by numerical simulation method, combined with theoretical (analysis) and experiment. Influencing factors of the mandrel include the count of mandrel heads, the diameter of mandrel and its position. According to the principle of NC tube bending, quality defects possibly produced in thin-walled tube NC bending process were analyzed and two parameters were proposed in order to describe the cross section quality of thin-walled tube NC bending. According to the geometrical dimension of tube and dies, the range of mandrel protrusion was derived. The finite element model of thin-walled tube NC bending was established based on the DYNAFORM platform, and key technological problems were solved. The model was verified by experiment. The effect of the number of mandrel heads, the diameter of mandrel and the protrusion length of mandrel on the cross section quality of thin-walled tube NC bending was revealed and how to choose mandrel parameters was presented. 展开更多
关键词 芯棒 数控弯曲 薄壁管 横截面质量
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Theoretical analysis and verification of uncertainty of measurement on a cantilever coordinate measuring machine
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作者 ZHANG Hai-tao LIU Shu-gui +1 位作者 LI Xing-hua SU Zhi-kun 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2017年第4期314-320,共7页
A cantilever coordinate measuring machine(CCMM)is proposed according to the in-situ measurement requirement of workpieces with complex structures limited by the finite space of the5-axes computerized numerical control... A cantilever coordinate measuring machine(CCMM)is proposed according to the in-situ measurement requirement of workpieces with complex structures limited by the finite space of the5-axes computerized numerical control(CNC)processing site.Factors affecting uncertainty of measurement(UM)are classified and analyzed on the basis of uncertainty evaluation criteria,and the estimation technique of UM for measuring systems is presented.UM of the CCMM is estimated from the factors such as temperature,error motions as well as the mechanism deformations.Measurement results show that the actual measurement error is smaller than that of measurement requirement. 展开更多
关键词 cantilever coordinate measuring machine (CCMM) structure design computerized numerical control machine estimation of uncertainty of measurement
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Patterns of CNC Machine Tool Reference Return and Its Trouble Shooting Methods
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作者 Lu Jiankang Wang Runxiao Northwestern Polytechnical University Xi’an 710071 P.R.ChinaGou Yali Qingan Aerospace Equipment Corporation Xi’an 710077 P.R.China 《International Journal of Plant Engineering and Management》 1997年第1期56-60,共5页
This paper presents four patterns of reference-return positions for CNC machine tools and analyses some causes of return reference troubles by showing typical examples of trouble shooting.Finally,it introduces several... This paper presents four patterns of reference-return positions for CNC machine tools and analyses some causes of return reference troubles by showing typical examples of trouble shooting.Finally,it introduces several methods of trouble shooting. 展开更多
关键词 Cnc (Computer numerical control) machine tool trouble shooting reference return
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Prototype CNC Machine Design
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作者 Paulo A. Sherring da Rocha Jr.t Rog6rio D. S M. Emilia de Lima Tostes 《Journal of Energy and Power Engineering》 2012年第11期1884-1890,共7页
The CNC (computer numerical control) is a technology which aims to generate, parse and execute sequential actions that describe the behavior of the end effector. This article reports the development of small sized, ... The CNC (computer numerical control) is a technology which aims to generate, parse and execute sequential actions that describe the behavior of the end effector. This article reports the development of small sized, low cost, prototype CNC system, based on a modular system with the capability of communication through USB. The report includes the basics of the electronic devices developed to run a CNC machine and proposes, as well, software developed in LabVIEW to control and establish the communication between the machine and the computer. The main objective of this work is the development of a machine which allows future researches on the process performance, on educational purposes, the demonstration of the parts involved on the CNC machine. 展开更多
关键词 machine control computer numerical control control systems.
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Java Language for Numerical Control Simulation System Research
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作者 LI Lei LI Hongmei ZHOU Huiqiang 《International Journal of Plant Engineering and Management》 2023年第3期166-179,共14页
Java language is widely used in a variety of development platforms to develop all kinds of application software for its simple and efficient.The programming language owning platform independent is adopted to solve the... Java language is widely used in a variety of development platforms to develop all kinds of application software for its simple and efficient.The programming language owning platform independent is adopted to solve the image flicker,sound loading and other issues by the threading technology,multimedia technology,graphics and point by point comparison techniques.Dynamic real⁃time process simulation is implemented and a two⁃dimensional network of CNC machining simulation system is developed while Java applet application is as a carrier.The simulation results show that the system has a friendly interface and fast calculation speed,and platform portability has a certain practicality and application value. 展开更多
关键词 network numerical control(nc) Java language by⁃point comparison interpolation SIMULATION
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