机床精益模组化生产模式的研究

针对机床行业和机床装配生产的特点,对机床精益生产模式进行实践探索,提出了机床精益模组化生产的概念.通过对机床模组化特点的分析,建立了机床模组化生产的组织架构与实施流程,并对机床装配工艺模组化和机床装配线生产控制系统(Assembly Line Control,ALC)进行了介绍.机床精益模组化生产模式可为多种少量的机床柔性生产提供借鉴和参考.     

组合机床液压系统设计

机床的发展由来已久,伴随着科技的创新和进步,机床在现在社会的发展已经处于一个相当高的水平。机床技术已经趋于成熟和完善,机床的种类也日益增多,许多先进的技术手段也与机床生产相结合。组合机床是一种专门为了某些专业构件而研究的,它在机床通用部分的基础上,加入专用的设备或者工艺的专用机床。液压技术在组合机床中逐渐应用,使组合机床的效率更高,较以前更为先进。文章对组合机床及组合机床的液压系统进行分析,提出组合机床液压系统的优化设计。     

并联机床研究趋势及我国发展现状分析

并联机床是一种完全不同于传统机床的新一代机床,目前国内外对并联机床的研究趋势主要集中在并联机床机构学理论及相关理论研究、并联机床精度和可靠性研究、并联运动机床开放式数控系统的研究、并联机床组成标准模块和关键基础件的研制等。我国较早地对并联机床进行了研究并取得了较为显著的成果。     

浅谈并联机床发展趋势

并联机床作为机器人技术、机床结构技术、现代伺服驱动技术和数控技术四者相结合的产物,其发展前景非常广阔。并联机床于1994年在美国芝加哥国际机床展览会上的首次面世标志着机床设计开始采用并联机构,成为机床结构重大改革的里程碑。本文简要介绍了现阶段对并联机床的基本研究和其亟待解决的问题,以及并联机床未来的发展趋势。     

浅谈提高机床主轴回转精度的措施

随着机床制造技术的迅速发展,特别是自动化数控机床的日益普及,对机床主轴的回转精度和刚度要求越来越高;此外,在机床的维修和改造方面,对机床主轴轴承进行合理调整和改造,提高机床主轴运转精度,是提高机床加工精度和节约成本的一种有效方法。因此,该文对机床的制造和维修改造具有一定的指导意义。     

五轴联动机床动态误差与RTCP分析

在对零件加工进行研究的过程中,机床的动静态分析是主要的分析对象,机床的切削能力反应了机床的加工能力,不同的误差对机床的影响也不同,产生的精度影响也不同,误差仿真技术可以有效发现机床的误差源。动态性能会影响高精密机床的制造加工精度。该文分析了五轴精密加工机床的动态性能、机床的RTCP功能、影响机床加工精度的因素和机床误差的产生,同时对误差的影响因素进行了分析,通过减小机床的误差,保证机床的动态性能能够满足加工需求。     

跨国并购：中国机床品牌国际化的重要途径

有关资料显示,近年来,我国先后有7家机床行业骨干企业并购了德国、美国等发达国家的名牌机床制造企业,加速了中国机床行业品牌国际化进程。机床行业跨国并购的产业经济背景(一)随着中国加速成为世界制造中心．中国已连续多年成为全球最大的机床市场。部分德国机床企业     

机床涂装工艺浅述

我国现阶段机床产品的涂装工艺仍以小批量、手工为主,随着机床零部件质量的提高以及规模化生产,原有机床涂装方式已不适合现代机床工业的生产.通过对机床产品特性的分析和方案比较,提出了机床产品涂装工艺设计和平面布置,并介绍了主要的涂装设备:水旋喷漆室、油漆烘干室、多功能喷涂打磨室.通过对机床涂装工艺合理的设计,使得工件可以按产品特性组织批量生产.     

机床主轴回转误差对加工精度影响分析

机床的质量取决于机床关键部件的质量,而机床主轴部件是保证机床加工精度的核心,主轴回转误差是影响机床加工精度的重要因素之一,直接影响到加工零件的形状精度、表面的粗糙程度和质量,实验结果表明:由主轴回转误差引起的精密     

浅析电气设备维修和设备保养的重要性

恪种机床的电气设备在运行过程中会产生各种各样的故障。引起机床电气设备故障的原因,除一部分是由于机床电器元件的自然老化引起的外,有相当一部分是因为忽视了对机床电气设备的日常维护和保养,以致使小毛病发展成大事故,所以为了保证机床正常运行,减少因电气修理的停机时间,提高机床的利用率和劳动生产率,必须重视对机床电气设备的维护和保养。     

Design of Vibration Monitoring System of CNC Machine

CNC machine have a fast development and is widely used in China. Generally, CNC machine tool, includs CNC lathes and CNC milling machine. CNC machine tool is a necessary tool for machining. It plays an important role in the mechanical design and machining fields. CNC machine tool is mainly composed of two parts of the machine body and the computer control system. Mechanical equipment failures usually related information such as vibration, sound, pressure, temperature performance. CNC machine tool vibration monitoring system with piezoelectric accelerometer, the eddy current displacement sensor, signal amplifier, signal conditioning modules. We can take an advantage of the CNC machine tool vibration monitoring system for vibration monitoring and fault diagnosis of CNC machine tools.     

A radius compensation method of barrel tool based on macro variables in five-axis flank machining of sculptured surfaces

Barrel tool radius compensation is very important to improve the five-axis CNC machining precision and efficiency of sculptured surfaces. By combining macro variables and math function of CNC controller, a radius compensation method of barrel tool based on macro variables in five-axis flank machining of sculptured surfaces was presented. The basic principle of barrel tool radius compensation in five-axis flank machining was firstly investigated. For a specific five-axis CNC machine tool with dual rotary tables, a relationship equation between compensated cutter location (CL) data and machine control (MC) data could be derived. A post-processor with the function of five-axis barrel tool radius compensation was then developed by using the C++ language, which could generate the NC programme with macro variables of barrel tool radius compensation. Finally, the NC programme was obtained automatically by the developed post-processor for the aero-engine blade surface machining. The machining process was simulated on the software VERICUT, and machining experiments were also conducted on the five-axis machine tool. Both the simulation and experimental results showed that the proposed method could perform the function of barrel tool radius compensation in the NC programme for five-axis flank machining.     

用激光干涉仪检测双丝杠驱动加工中心的方法与评定

介绍了使用激光干涉仪检测双丝杠驱动加工中心时,选择测量轴线的有效位置,能够真实地反映加工中心轴线的运动定位状态;提出检测双丝杠驱动加工中心定位精度和重复定位精度的方法,通过调整激光干涉仪和位移镜组件的安装位置,获得数控机床及加工中心的检测精度,并根据自动采集获得的测量数据进行有效地补偿,以提高和恢复数控机床及加工中心的最佳定位精度.     

Adaptive nonlinear tool path optimization for five-axis machining

Current tool path computation in the CAM algorithms approximates the surface by piecewise linear interpolation. In the case of three-axis machining on a CNC machine the tool will exactly reproduce this computed tool path. However in the case of five-axis simultaneous machining the real tool path on the CNC machine will not follow the linear approximation computed by the conventional CAM algorithm. A new CAM algorithm is proposed which approximates the surface to be machined by a piecewise curved approximation. This curve represents the real tool path followed on the five-axis machine. This piecewise curved approximation is further optimized by formulating the tool path computation as the generation of a grid based on a variational smoothness penalty function. This new algorithm considerably improves the accuracy and reduces the number of blocks and machining time.     

高速激光切割机床数控加工态势识别系统

当前方法设计的系统对机床数控加工态势进行识别时,没有对噪声进行回放,对切割平面度、切割定位精度、机床平稳性进行识别时,识别结果不准确,存在识别准确率低的问题。该文提出高速激光切割机床数控加工态势识别系统设计方法,首先,通过运动控制卡,伺服控制模块及加工态势识别模块构成高速激光切割机床数控加工态势识别系统的架构;其次,在加工态势识别模块中设计系统初始化、态势识别、自动诊断报警、运动控制、图形转码和G代码编译等子模块,在此基础上,通过噪音采集、噪音回放和信号分析等方法提高加工态势识别的准确率;最后,采用HMM算法构建高速激光切割机床数控加工态势识别模型,实现加工态势识别。实验结果表明,加工态势设计方法设计的系统可有效识别机床的切割平面度、切割定位精度和机床平稳性,识别准确率较高。     

Intelligent tool path correction for improving profile accuracy in CNC turning

This paper presents the development of an intelligent predictive tool for improving the accuracy of parts produced on CNC turning centers. Actual dimensions and shape (form) produced on components during machining differ from the nominal dimensions commanded in the CNC program. These dimensional and form errors on parts depend on a variety of factors such as tool/work deflections, machine tool accuracy, machining conditions etc. These errors, if predicted, can be used to correct the ideal CNC code and thus improve the part accuracy in CNC machining. In the present work artificial neural networks are used to capture the complex relationship between the errors on the component and the input process conditions. Significant improvement in part accuracy has been obtained using the corrected CNC code during machining.     

Load spectra of CNC machine tools

Load spectra of CNC machine tools are described in this paper; 112 CNC machine tools have been traced for 3 years. Data including machining parameters and conditions, drawings and NC programs of parts, process cards and specifications of each individual CNC machine tool are gathered. A database containing this information is designed. The loads of CNC machine tools are calculated and the distribution parameters of loads are estimated. A fuzzy multicriteria comprehensive evaluation method is applied to evaluate the fitness of the distribution model. This methodology lays a foundation for the reliability designs of CNC machine tools. Copyright © 2000 John Wiley & Sons, Ltd.     

纤维树脂混凝土数控机床基础件热动力学拓扑优化研究综述

提出了从改善结构设计,采用新材料的角度出发解决困扰我国数控机床加工精度的难题。在对纤维增强树脂混凝土作为机床基础件的国内外研究现状分析的基础上,提出基于拓扑优化的方法、结合数控机床工作的环境条件,并考虑材料自身力学本构关系来对纤维增强树脂混凝土机床基础件进行优化设计。最后给出了具体解决策略和思路。     

数控机床热误差的建模与预补偿

研究了数控机床热误差的预补偿方法。建立了基于主轴转速的热误差自回归模型,从而不需要测量机床的温度场就可以预测热误差。在加工前通过修改工作的数控加工程度即可进行补偿,大大简化了误差补偿过程。可应用于中等精度的数控机床。     

基于状态空间模型的机床加工精度分析

伺服进给系统的机电耦合特性直接影响数控机床的加工精度，单独针对伺服系统或机械系统建立的模型不足以准确分析系统参数对机床整机加工精度的影响。因此，综合考虑机床伺服系统与机械结构之间的耦合关系，建立伺服进给系统机电耦合动力学模型具有重要意义。首先，为保证伺服进给系统建模精度，利用状态空间法建立了机床机电耦合状态空间方程。其次，建立了伺服进给系统机电耦合Simulink模型，在此基础上采用复合控制提高系统的响应速度和加工精度。随后，利用多体动力学软件建立机床进给系统的刚柔耦合动力学模型，添加摩擦、阻尼等非线性因素，并导入Simulink与伺服系统建立耦合关系。最终，建立了卧式加工中心伺服进给系统的刚柔-机电耦合仿真加工平台，通过模拟机床加工轨迹以验证机电耦合状态空间模型的可靠性。结果表明：该状态空间模型能准确描述系统内部参数和系统输入输出的耦合关系；采用复合控制结构能有效提高系统的响应速度和加工精度。研究结果为数控机床的仿真建模和提高加工精度提供理论依据，为机床机电系统的设计提供有效指导。