基于成组技术的NC代码分类及其转换技术的研究

为解决网络化制造环境下各类不同的机床NC系统对NC代码资源共享的需求,以及新的NC系统如何利用原有NC代码资源的问题,提出了运用成组技术的理念来分析NC代码的属性,并对NC代码进行分类、编码的可行性进行了探讨;通过基于代码实现的功能对NC代码进行分类,讨论了建立NC代码全功能集的步骤;最后介绍了NC代码的编码系统的内容,并对其应用进行了讨论.     

基于STEP-NC数控系统的研究

阐述了ISO6983的缺点及STEP—NC的优点；分析了STEP—NC产品数据模型的具体组成、文件结构、描述方法和生成途径；研究了STEP—NC数控系统的组成，提出SOFT型开发式STEP—NC控制器的概念及实现原理；指出STEP—NC对数控技术及制造业的深远影响。     

智能化的CNC--STEP-NC

介绍了STEP—NC的基本概念、数据模型、程序结构及相关辅助软件，指出了STEP—NC对制造业的影响，以及研究STEP—NC的重要性。     

变型零件NC程序主模板设计

针对大规模定制环境下数控加工程序的快速设计问题，在分析变型技术和NC编程技术的基础上，提出了一种适合零件尺寸变型的NC程序主模板的模型。通过加工特征的定义、划分和NC子程序库的设计，对NC程序主模板的内容和结构进行了分析，给出了NC程序主模板的生成过程。开发了NC程序主模板生成向导，以人机交互的方式快速得到定制零件族的NC程序主模板，实现了基于NC程序主模板的数控加工程序生成过程，可以快速得到变型零件的数控加工程序，提高了变型零件数控程序设计的效率和自动化水平，并用实例验证了这些原理的可行性。     

基于ISO6983与ISO14649标准的数控系统对比研究

按照传统NC接口标准ISO6983编写的数控程序局限性很多，严重阻碍了数控技术开放式、网络化的发展。STEP—NC是STEP标准在CNC领域的扩展，它弥补了传统标准的缺陷，成为数控技术的最新研究方向。文章分析了传统NC接口标准ISO6983的局限性，并与最新NC接口标准ISO14649作了对比，指出了STEP—NC的优越性。     

回转类零件NC加工智能编程系统

阐述了我公司自行研制开发的回转类零件NC加工智能编程系统,该系统是基于Esprit-X11数据应用软件,利用其二次开发语言Language Programming研究开发的智能化编程系统,主要应用于汽轮机关键零件－－整体转子的NC加工的程序编制。该系统运用CAD／NC全集成的系统原理,在CAD模型接口、CAD几何信息的择取、NC模型转换、NC工艺规范、中间数据转换、NC指令生成以及仿真加工等方面进行了研究和开发。     

综观开放式数控系统

本文论述了NC开放化的背景，NC开放化的基本概念，PC－NC的主要形态以及国内外开放化NC的研究开发概况     

基于STEP-NC数控加工的研究

STEP-NC技术是STEP标准在制造领域的应用，它定义了一种新的数控程序标准。首先介绍了STEP—NC的概念、数据模型和文件格式，对STEP-NC控制器进行了研究，提出了STEP—NC控制器应实现的功能和框架结构。探讨了STEP—NC的出现对制造信息化的影响，提出了基于STEP—NC的制造系统的闭环模式，研究了基于STEP—NC的智能化、网络化的实现方法，最后对其发展进行了展望。     

NC编程工作模式的变革

本文从技术层次介绍了Quick NC所采用的最新NC编程技术及其与传统技术的区别,同时阐述了这种新的技术为NC编程带来的影响,特别是对NC编程工作模式的变革。     

挑战传统NC技术 变革NC工作模式——新品Quick NC引导世界数控编程新技术

本文从技术层次介绍了Quiok NC所采用的最新NC编程技术及其与传统技术的区别,同时阐述了这种新的技术为NC编程带来的影响,特别是对NC编程工作模式的变革。     

基于自校准功能的低压智能断路器的校准器的设计

分析了低压智能断路器的系统误差对供配电安全可靠性构成的威胁,提出了低压智能断路器的校准器的总体设计方案,给出了系统硬件电路设计说明,介绍了系统程序设计的关键环节和系统误差的校准方法。     

EDFA增益平滑滤光片的容差特性模拟分析

在讨论 EDFA增益平滑滤光片镀制过程中监控方法及误差产生机理的基础上 ,利用自建的计算机膜厚容差模拟程序 ,分析了滤光片的容差特性 ,找出了膜系中影响膜系性能的对膜厚误差最敏感的膜层     

The effect of cam profile errors and system flexibility on cam mechanism outputL'effet des erreurs de profil des cames et de la flexibilite du systeme sur son fonctionnement

An investigation of the effects of machining errors in the contact surfaces of a cam mechanism together with all possible system flexibility errors is carried out by simulation. An 11 degree of freedom dynamic model of a cam follower system including its drive system was selected, and the dynamic simulation is combined with a stochastic simulation of the random nature of the machining tolerances which have a considerable effect on the actual output. Jump phenomena, the preloading of the retaining spring, variations in angular velocity, characteristics of the various motion curves, flexibility of the various components, non-roundness of cam shaft bearings, non-concentricity of the base circle and machining tolerance on both cam profile and follower are all taken into account, and an analytical method to calculate the spring constant between cam and follower considering Hertzian contact is developed.The lengthy simulation program is handled on a mini-computer by utilizing suitable numerical methods and overlay techniques resulting in a continuous simulation of the effects of all input errors in a cam-mechanism. The effects of tolerance and flexibility errors are examined separately as well as in combination.     

数控机床几何误差建模及误差补偿的研究

基于多体系统运动学理论，建立了一种通用的数控机床几何误差模型，该模型易于实现计算机自动编程，能够广泛的应用于各种不同类型的数控机床上。给出了实现误差补偿的算法和程序流程图，特别针对直线与圆弧的分段处理进行了研究，结出了分段方法及坐标求取方法。最后，以一台三轴立式加工中心为例，对其21项几何误差进行了辩识，通过实验验证了误差补偿的效果。     

以特征造型为基础的CAD／CAM系统

介绍了一种基于铣削特征为基础的CAPP系统。用户可在特征库的支持不对所要加工的零件进行特征造型,形成零件的描述文件;系统根据描述的特征信息自动生成加工工艺和数控加工程序,并可利用仿真模块对生成的数控加工程序进行仿真检验,若发现数控加工程序有误,可及时方便地进行修改。     

Propagating bias and precision errors using the perturbation method

Calculations based on measured variables are subject to some uncertainty due to errors in measurements. These measurement errors, while unavoidable, can be quantified. The usual method for determining the uncertainty in a calculated variable, given the uncertainties (or expected errors) in the measured variables that define it, involves the use of the Taylor series method. With this method, the partial derivative of the result with respect to each of the measured variables must be determined. This can be tedious and time consuming. When results are calculated by computer, another method is available that does not require partial differentiation. This alternative is known as the perturbation method.

This paper explains fow the perturbation method can be used in conjunction with the methodology for propagating measurement errors set forth in ANSI/ASME Performance Test Code 19.1-1985. The FORTRAN coding required to implement the perturbation method is also described. The program, which propagates the measurement uncertainties, is easily combined with the results calculation code and requires little or no maintenance. The code was developed to determine uncertainties associated with boiler performance calculations that were carried out as part of a test program for circulating fluidized bed combustion sponsored by the Electric Power Research Institute.     

数控机床机械手柔性定位控制方法研究

提出了新的数控机床机械手柔性定位控制方法。在柔性条件下构建数控机床机械手双作业臂的运动学模型,基于该模型设计气动定位控制硬件与控制程序,硬件选用光编码器和分周处理器等设备,软件程序通过 PLC 来编制,从而实现对机械手手臂各关节及基座等位置的定位控制。测试结果表明:应用所提方法后,作业臂旋转关节定位变量值与其定位理想值十分接近;作业臂 1 、2 的定位变量值相对误差最高不超过 0.50° 、0.40° ,平均定位误差分别为 52.805 mm 、 58.055 mm 。说明所提方法的定位控制性能能够满足设计需求。     

A new high-efficiency error compensation system for CNC multi-axis machine tools

To enhance the accuracy of CNC machines for the request of modern industry, an effective static/quasi-static error compensation system composed of an element-free interpolation algorithm based on the Galerkin method for error prediction, a recursive software compensation procedure, and an NC-code converting software, is developed. Through automatically analyzing the machining path, the new error prediction method takes into consideration the fact that the machine structure is non-rigid, and can efficiently determine the position errors of the cutter for compensation without computing a complex error model on-line. The predicted errors are then compensated based on a recursive compensation algorithm. Finally, a compensated NC program will be automatically generated by the NC-code converting software for the precision machining process. Because of the advantage of the element-free theory, the error prediction method can flexibly and irregularly distribute nodal points for accurate error prediction for a machine with complex error distribution characteristics throughout the workspace. To verify the algorithm and the developed system, cutting experiments were conducted in this study, and the results have shown the success of the proposed error compensation system.     

IMPROVING ACCURACY OF CNC MACHINE TOOLS THROUGH COMPENSATION FOR THERMAL ERRORS

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