CNC-implemented fault diagnosis and web-based remote services

Recently, the conventional controller of machine-tool has been increasingly replaced by the PC-based open architecture controller, which is independent of the CNC vendor and on which it is possible to implement user-defined application programs. This paper proposes CNC-implemented fault diagnosis and web-based remote services for machine-tool with open architecture CNC. The faults of CNC machine-tool are defined as the operational faults occupied by over 70% of all faults. The operational faults are unpredictable as they occur without any warning. Two diagnostic models, the switching function and the step switching function, were proposed in order to diagnose faults efficiently. The faults were automatically diagnosed through the fault diagnosis system using the two diagnostic models. A suitable interface environment between CNC and developed application modules was constructed for the internal function of CNC. In addition, a suitable web environment was constructed for remote services. The web service functions, such as remote monitoring and remote control, were implemented, and their operability was tested through the web. The results obtained through this research could be a model of fault diagnosis and remote servicing for machine-tool with open architecture CNC.     

数控机床的维护保养和故障诊断

数控化生产在当代社会占着举足轻重的位置。重点讨论了数控机床维护与保养的基本要求,数控机床的故障诊断,其中包括了如何正确操作规程,合理使用数控机床,尽可能提高机床的开动。最后分列说明了对数控机床故障诊断的一般步骤和一般方法,并对其应用和维修的要素做出了说明。     

数控机床PMC故障诊断与实例分析

介绍了了PMC类故障诊断的常用方法,详细阐述了PMC的动态和静态两种诊断法的应用,结合PMC故障实例,通过数控系统的自诊断功能、I/O状态、PMC梯形图及动态跟踪梯形图等方法来判断故障原因,提高了故障诊断的速度和准确性。     

数控机床伺服系统的故障分析及处理

伺服系统是联系数控系统和机床的中间环节,伺服系统的故障是数控机床中较为重要的故障.结合实际工作中数控机床的故障现象,介绍伺服系统最常见的故障类型;根据故障定位方法判断故障发生部位;通过伺服系统故障诊断实例进行说明并提出处理办法.     

基于B/S的数控机床故障诊断系统的开发

数控机床发生故障会对机械装备制造业造成不可估量的损失。针对传统故障诊断方法的不足,利用B/S网络技术与数据库技术,建立了一种网络环境下的数控机床故障诊断系统。该系统可快速定位故障并及时报修,为企业节省了时间,降低了成本。     

基于绩效激励机制的数控机床人机交互系统创新设计

在中国制造业转型背景下,为了提高数控机床一线操作工人的工作绩效表现以及正面的心理情绪,设计了一种基于绩效激励机制的数控机床人机交互系统,作为一种创新的企业人力资源管理方法。为了实现该系统设计,提出了相应的系统结构设计策略。该系统通过网络技术联结了数控机床、上位机、云端平台以及移动客户端四个组成部分,对数控机床操作工人的各项生产过程数据进行计算与比较,利用实时的视觉反馈方式传递给相应的工人用户以及管理层用户。为了测试该系统的有效性,在两个制造业工厂内进行实验,结果表明,该系统使参与者的工作动机、工作满意度以及工作绩效表现有显著提升。     

数控机床回参考点控制原理与故障分析

分析了数控机床返回参考点的方式和原理,总结了回参考点的参数设定与挡块位置调试步骤,以及数控机床回参考点故障类型和产生的主要原因,提出了相应的故障诊断方法。     

数控机床回参考点常见故障分析与诊断方法

结合具体实例,分析了数控机床回参考点故障发生的主要原因,总结出该类故障发生的主要形式和规律,提出了相应的诊断和维修方法。     

基于元动作链理论的数控机床故障分析

利用所提出的元动作链方法建立宏观系统可靠度变化与微观元动作运行失效原因之间的联系,对数控机床运行过程中的运行故障进行了分析。以蜗轮齿面磨损失效为例,分析了微观失效原因与故障发生概率的联系,并综合所得到的故障底事件发生概率曲线,融合成系统可靠性曲线,从而实现系统结构信息、系统运行信息、微观失效原因信息、宏观可靠性模型的高度集成。算例表明,所提出的元动作链模型能够对机床的状态变换进行准确描述,有助于精确分析机电系统所有的故障模式,消除了传统可靠性建模过程中的不确定性。     

A scheme for an internet-based checking method of machine-tools with variant CNC architecture

This paper proposes an Internet-based checking technique for machine-tools with variant Computerized Numerical Controller (CNC). According to its architecture, CNC is classified into one of two types: Closed Architecture Controller (CAC), which is the conventional CNC, or Open Architecture Controller (OAC), which is a recently introduced PC-based controller. Since CAC has a closed architecture, it is dependent on CNC vender specification. Because of this, it has been very difficult for users to implement application programs in the CNC domain. Recently, the conventional CNC of machine-tools has been replaced by a PC-based open architecture CNC. However, now many conventional CAC machines are being operated together with OAC machines in inadequately equipped shop floors. For Internet-based checking for variant CNC machines with CAC and OAC, a suitable systematic environment is necessary. Through this research, for the global management of variant CNC machines both a CAC and an OAC in the manufacturing system, a suitable environment for Internet-based checking of variant CNC machines was designed, and the checking methods for CAC and OAC machines were compared. The results of this research may serve as a base model for global monitoring and remote control in an integrated manufacturing system with variant CNC machines. Checking points defined in this research are classified into two categories: structured point and operational point. The former includes the vibration of bearing, temperature of spindle unit, and other points of periodical management, while the latter includes oil checking, clamp locking/ unlocking, and machining on/off status.     

考虑共因故障的系统组成单元故障严重性测度模型

针对共因故障影响下的系统组成单元故障严重性测度问题,借助合作博弈思想,将系统组成单元看作是博弈的参与主体,将共因部件组定义为博弈过程中形成的联盟,构建了考虑共因故障的系统组成单元故障严重性Shapley值测度模型。首先,针对传统故障严重等级测度的不足,建立了故障严重等级非线性转换函数;其次根据共因故障特征提出了其联合严重性测度方法;然后根据共因部件组的形成概率以及系统组成单元对不同共因部件组联合严重度的边际贡献,求解出了共因故障影响下的系统组成单元故障修正严重度;最后结合某型号数控机床主轴系统的案例研究,探讨了不同非线性转换以及是否考虑共因故障对系统组成单元故障严重性测度的影响,表明了所提方法的可行性。     

FANUC数控机床返回参考点常见故障的诊断与分析

在数控机床的维修中,有关数控机床回参考点方面的故障率非常高。对于机床经常出现的回参考点故障,搞清楚回参考点的作用与原理是非常重要的。为了便于数控维修人员能够迅速准确地判断故障点,以配置FANUC 0i系统的数控机床为例,把有关机床回参考点的原理、动作过程以及故障现象进行了分析,以使大家能够从根本上了解和排除数控机床在返回参考点方面出现的各种故障。     

关于数控机床故障诊断的基本思路

随着数控机床的广泛应用,数控机床的维护维修变得更为复杂。了解和掌握数控机床的故障诊断和养护方法有助于延长设备的使用寿命,减低维修的成本,避免机械事故的发生。因此,该文提出对数控机床故障诊断的基本思路,从而简化故障诊断过程,提高故障诊断的准确性和快速性。     

数控机床故障原因分析方法浅谈

本文结合作者多年来从事数控机床故障分析与诊断方面的工作实践,系统地介绍了简便、快捷、实用的数控机床故障修理<契合法>、<差异法>和<共变法>,帮助分析、诊断出可能导致故障的原因,准确、迅速地排除,确保数控机床的运行.     

开放式体系结构数控系统实时性的建模与分析

给出一个新的用于描述开放式体系结构数控系统(Open architecture computerized numerical control system,OAC)的建模方法——时间转化模型/全时轴实时时态逻辑(Timed transition model/all-time real-time temporal logic,TTM/ATRTTL)。TTM/ATRTTL提供一整套方法用于对OAC系统的硬实时性和反馈特性进行建模并使用该形式化方法在系统层对OAC系统进行建模。分别给出开环OAC,系统级逻辑控制器以及任务间通信和同步机制的TTM模型,并最终给出具有调度机制的闭环OAC系统TTM模型。该模型为系统验证体系结构的基础。最后,给出系统验证体系结构并用模型验证工具STeP和CAD工具SF2STeP实现之。在系统验证过程中,首先解决STeP中遇到的若干模型验证问题,这些问题包括重写规则,验证规则,状态爆炸问题,以及时间约束限制问题。通过模型验证试验解决OAC系统运行过程中出现的死锁以及系统各模块执行时间约束检验问题。试验结果表明该方法可以有效地对OAC系统进行建模并对系统的实时特性进行验证。     

数控机床故障诊断专家系统的设计

建立了一个数控机床故障诊断专家系统。详细地介绍了ＴＣＧ１６ＣＮＣ机床故障诊断专家系统的结构与功能，以及采用基于知识的诊断推理，诊断目标的建立、诊断知识库的组成两个关键性技术问题的解决方法。最后介绍了ＴＣＧ１６ＣＮＣ机床故障诊断专家系统在工厂的应用。     

An Efficient Expert System for Machine Fault Diagnosis

An efficient expert system for machine fault diagnosis is developed. A new search method is proposed in this system to improve the efficiency of the diagnostic process. First of all, a diagnostic tree (a decision tree) is built by domain experts according to the functions of the devices in the machine. Then, the diagnostic priorities of nodes (devices) in the tree are determined based on a fuzzy group multiple attribute decision making method. A meta knowledge base for fault diagnosis is generated automatically based on the determined priorities to guide the diagnostic process. After that, a domain knowledge base that hypothesises possible faults for each device in the tree is generated by domain experts and/or manuals. At last, the inference process starts based on the meta knowledge base and hypothesises which device is the possible cause of failure. To validate the system performance, an illustrative example (VCR troubleshooting) is presented for demonstration purposes.     

基于故障树分析法的数控机床故障诊断系统

对数控机床典型故障建立故障树,通过其最小割集进行故障定性分析,并用VC 6.0开发了一套基于故障树分析法的数控机床故障诊断系统.     

数控机床伺服系统的故障形式及诊断方法

进给伺服系统故障是数控机床中较为常见的故障.首先,结合实际工作中数控机床的故障现象,介绍了伺服系统最常见的故障形式;其次,根据故障定位方法判断故障发生部位;最后,通过伺服系统故障诊断实例进行说明并提出处理办法.     

基于CDIO的《数控机床故障诊断与维修》课程学习效果分析

《数控机床故障诊断与维修》是高职院校学生掌握数控机床故障诊断与维修方面技能与知识的必修课,本文探索基于CDIO理论《数控机床故障诊断与维修》教学模式,系统分析了基于CDIO理论的《数控机床故障诊断与维修》课程学习效果,对于推动该课程教学模式改革具有重要意义。