Real-Time Data and Visualization Monitoring of Computer Numerical Control Machine Tools Based on Hyper Text Markup Language 5

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.

Specialized Numerical Control Plasma Cutting Machine

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.

CPS Modeling of CNC Machine Tool Work Processes Using an Instruction-Domain Based Approach

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.

The Innovation of CNC Machine Interface Based on DNC System

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.

Patterns of CNC Machine Tool Reference Return and Its Trouble Shooting Methods

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.

Reliability Analysis of Electrical System of Computer Numerical Control Machine Tool Based on Bayesian Networks

The core of computer numerical control(CNC) machine tool is the electrical system which controls and coordinates every part of CNC machine tool to complete processing tasks, so it is of great significance to strengthen the reliability of the electrical system. However, the electrical system is very complex due to many uncertain factors and dynamic stochastic characteristics when failure occurs. Therefore, the traditional fault tree analysis(FTA) method is not applicable. Bayesian network(BN) not only has a unique advantage to analyze nodes with multiply states in reliability analysis for complex systems, but also can solve the state explosion problem properly caused by Markov model when dealing with dynamic fault tree(DFT). In addition, the forward causal reasoning of BN can get the conditional probability distribution of the system under considering the uncertainty;the backward diagnosis reasoning of BN can recognize the weak links in system, so it is valuable for improving the system reliability.

基于CNC系统的数控车床故障诊断方法

数控车床在现代制造业中扮演着重要角色,其故障诊断对于保障生产效率至关重要。提出一种基于计算机数控(Computer Numerical Control,CNC)系统的数控车床故障诊断方法,通过运行参数采集、数据预处理、特征提取和支持向量机算法,实现故障模式的智能识别。实验结果表明,该方法在故障检出率、误报率、诊断时间和准确率等方面均优于传统方法,为数控车床的智能化维护提供了新的思路,有助于提高设备的可靠性和生产效率。

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Driven by the ever increasing demand in function integration,more and more next generation high value-added products,such as head-up displays,solar concentrators and intra-ocular-lens,etc.,are designed to possess freeform(i.e.,non-rotational symmetric)surfaces.The toolpath,composed of high density of short linear and circular segments,is generally used in computer numerical control(CNC)systems to machine those products.However,the discontinuity between toolpath segments leads to high-frequency fluctuation of feedrate and acceleration,which will decrease the machining efficiency and product surface finish.Driven by the ever-increasing need for high-speed high-precision machining of those products,many novel toolpath interpolation and smoothing approaches have been proposed in both academia and industry,aiming to alleviate the issues caused by the conventional toolpath representation and interpolation methods.This paper provides a comprehensive review of the state-of-the-art toolpath interpolation and smoothing approaches with systematic classifications.The advantages and disadvantages of these approaches are discussed.Possible future research directions are also offered.

Studies of layout of world machine tools industry based on patent analysis

As the foundation of an industrialized country nowadays,machine tools industry is regarded as the engine of industrial development of a country.The developed countries,such as USA,Germany and Japan,have widely deployed the technology of using the patent in order to keep their strength in various fields.This research examins the CNC machine tools industry in the world by using the patent analysis method.It first gives an overview about the world patent application in CNC machine tools industry from 1963 to 2010 and divides the development of the industry into five stages.It also lists the patent application of the world top 20 countries,where the top 5 countries are compared.The patents of the world top 10 companies of machine tools manufacturers are mapped according to the international patent classification(IPC),and the future trends of world machine tools industry are discussed.Finally conclusions and suggestions are presented.

高速动车组铝合金零件CNC铣削加工工艺研究

高速动车组应用了较多铝合金零件。此类零件存在较高的加工装夹难度,若无法准确把握加工工艺,易出现加工缺陷。结合铝合金零件性能,详细分析零件计算机数字控制机床(Computer Numerical Control,CNC)铣削加工工艺特点,并从多个角度研究铝合金零件的CNC铣削加工工艺及其热处理技术。合理优化加工参数和热处理技术,可提高铝合金零件的加工质量和机械性能,促进高速动车组铝合金零件加工工艺水平的提升,进而推动我国高速动车组的发展。

柔性模块化CNC工装在离散型制造中的应用

电力装备零件加工具有小批量、多品种、加工复杂度不高的离散型制造特性,但频繁的装夹和换型调试会严重影响设备综合效率(Overall Equipment Effectiveness,OEE),导致加工效率偏低。研究结果表明:通过柔性组合工装设计,将大部分装夹过程转移至设备外,可减少停机等待时间;通过模块化安装节点设计,快速提升工装安装速度,可缩短换型时间。通过对某数控机床(Computer Numerical Control,CNC)设备的工装进行柔性模块化改造,产品装夹时间和换型时间分别缩短了56.71%和41.18%,设备OEE水平提升了26.17%。经过3年推广应用,企业CNC设备的OEE已由45%~55%提升为70%~80%,产品交付效率显著提高,产品竞争力逐步增强。此外,该柔性模块化工装改造新模式,可为国内广大制造业厂家提供一种新的降本增效思路。

基于CNC实时监测数据驱动方法的钛合金高速铣削刀具寿命预测

针对车间内不同设备的数据结构不一致导致车间监控数据中存在大量的多源异构数据,难以通过单一的通信协议采集与监控的问题,研究了基于OPC-UA技术与MTConnect协议的刀具、机床的数据模型、通信架构及访问策略,解决了多源异构数据的采集问题。针对硬质合金刀具在高速铣削钛合金工件时磨损较快、刀具剩余寿命的实时预测难度大的问题,建立了一种基于PCA前置处理数据的神经网络模型,实现了基于刀具剩余寿命的刀具健康状态信息的实时监测和预测。

虚拟CNC的齿轮测量中心

介绍了传统CNC齿轮测量中心的发展现状,结合虚拟现实技术,提出了CNC齿轮测量中心新的发展方向—虚拟CNC齿轮测量中心,同时介绍了虚拟CNC齿轮测量中心的概念、组成、实现方法。通过对虚拟CNC齿轮测量中心工作过程的仿真和分析,证明虚拟CNC齿轮测量中心基本可以表达真实CNC测量中心的几何形状和测量过程。

基于FANUC系统速度前馈提高CNC机床加工精度的研究

针对高速高精加工过程中,因数控伺服系统时滞而导致的指令轨迹与实际轨迹存在偏差、进而导致形状误差的问题,将前馈控制引入数控机床伺服系统。通过理论分析可知:选用适当的前馈控制器,可以有效减小形状误差。数控机床测试结果表明:通过调整速度前馈系数,可以提高速度环的增益,从而减小因加速度变化引起的形状误差,改善表面精度和加工形状精度,进而提高CNC机床的加工精度。

基于IPC的计算机数控(CNC)系统

用工业个人计算机开发ＣＮＣ系统具有很多的优越性。本文主要介绍了一种基于ＩＰＣ的ＣＮＣ系统的硬件和软件以及对一些关键问题的解决措施。

CNC雕刻机平面并联机构的运动学设计

提出一种新型三坐标 CNC雕刻机的概念设计 .该雕刻机采取平面并联机构实现 X,Y方向进给运动 ,而安装在该机构末端的串联主轴实现 Z向进给运动 .针对该平面并联机构 ,研究基于总体灵活度的运动学设计方法 ,指出运动学设计问题可归结为以全局运动性能指标最大为目标的单目标、有约束的优化设计问题 .同时 ,利用随机方向法搜索到一个最优解 ,通过实例分析进行验证 .结果表明 ,提出的方法是可行的 ,可用于样机的开发 .

与CNC机床配套的计算机控制零件尺寸在线测量系统的研究

论证了该系统的总体设计方案,阐述了其结构组成与工作原理,给出了该装置的主要机械结构、硬件、软件系统的具体设计,并对测量系统的精度进行了分析。

CNC系统开发与应用

介绍一种基于单片机控制的CNC系统,阐述了系统的硬件组成、软件设计和工作原理。该系统已成功应用于数控车床、数控铣床等机床控制中,其投资成本小,性价比高,完全满足企业生产的各项技术要求,特别适合中小企业及个体企业投资需要。

轧辊铣床CNC系统的设计

本文介绍了螺纹钢轧辊数控铣床的工作原理.阐述了轧辊铣床数控系统的软件、硬件结构.实现方法和轨迹插补算法.该系统软、硬件均已调试成功.并已在多家冶炼厂投入使用.在应用中取得了良好的效果.

基于Multibus的AC CNC系统体系结构研究

基于数控系统的高性能要求,提出了一种新的计算机数控(CNC)系统体系结构。在硬件结构上,基于Multibus构成多微处理器功能模块化结构,并采用双端口存储器连接基本CNC模块和自适应控制(AC)模块两个主模块。在软件结构上,基于iRMXⅡ操作系统建立了实时多任务数控操作管理系统,以保证各功能模块的并行处理和协调相互间的信息交换。