一种开放式数控系统刀具运动轨迹验证方法

为了更准确的仿真五轴数控机床各运动轴的运动情况,提出一种开放式数控系统刀具运动轨迹验证方法.本方法从运动控制组件中采集运动控制数据,利用五轴机床机构运动学模型,将运动控制数据转换为工件坐标系下刀具的运动轨迹,并以三维线框方式显示.通过CNC系统与CAD系统STL模型数据的交换,实现了刀具运动轨迹与CAD设计模型的分析比较,并设计了轨迹误差计算模型,可以定量分析仿真的刀具运动轨迹.最后通过实验验证了方法的正确性.     

虚拟制造环境下数控机床的运动学建模与仿真

首先利用Pro/E软件建立三轴数控铣床的虚拟模型,以最简化原则建立运动副的坐标系后,对机床结构进行分析,建立了虚拟环境下任意三轴数控机床的通用运动学模型,实现了任意虚拟三轴数控机床运动的通用求解方法。最后结合ADAMS软件对XH-714型三轴数控铣床的圆周运动进行仿真分析,最终验证了所建虚拟数控机床运动学模型的正确性。     

VERICUT五轴联动数控机床模型建立及加工仿真

近年来,许多医疗设备,航空零部件,汽车零部件和模具都需要具有较高的精度和复杂的空间几何形状,使得五轴加工越来越重要,但是因为五轴机床具有自由度大,精度高且承受不了碰撞的特点,因此五轴机床在执行切削加工前,必须进行切削模拟测试。鉴于此,我们设计了一个五轴机床机构的运动仿真模型,并使用这个机构模型进行数控刀具路径的仿真模拟。首先,由Creo设计该五轴机床的机构模型和工件模型,通过CAM软件设计五轴加工NC代码,然后再通过VERICUT仿真模拟软件整合两者资料并构建刀具资料后,即可开始五轴加工仿真模拟,通过这样的方式将Creo、CAM软件和VERICUT软件三种软件中的五轴机床资料整合在一起,使用户可以看到五轴机床的运动仿真场景的结果,并切削模拟,还能让使用者在NC加工程序之后,可以更容易且更快地获得切削加工仿真的结果。     

VERICUT软件在五轴高速铣加工中的应用

一、VERICUT软件简介 VERICUT软件是美国CGTECH公司开发的数控加工仿真系统,由NC程序验证模块、机床运动仿真模块、优化路径模块、多轴模块、高级机床特征模块、实体比较模块和CAD/CAM接口等模块组成,可仿真数控车床、铣床、加工中心、线切割机床和多轴机床等多种加工设备的数控加工过程,也能进行NC程序优化,缩短加工时间、延长刀具寿命、改进表面质量,检查过切、欠切,防止机床碰撞、超行程等错误;具有真实的三维实体显示效果,可以对切削模型进行尺寸测量,并能保存切削模型供检验、后续工序切削加工;具有CAD/CAM接口,能实现与UG、CATIA及MasterCAM等软件的嵌套运行.     

数控回转工作台的几何误差测量和建模

作为五轴数控机床的关键零部件,数控回转工作台能够实现C轴和A轴的回转进给与定位,其精度在很大程度上决定了数控机床的加工精度。以此为研究背景,建立了回转工作台的空间误差模型,对回转工作台的几何误差进行测量,并建立了误差补偿的数学模型,为最终进行机床的误差补偿提供依据,从而实现数控加工中心加工精度的提高。     

基于AutoCAD的数控加工可视化仿真系统研究

NC仿真是代替传统"试切"来验证NC加工程序正确性和合理性的重要措施.综合利用三维实体建模技术与数据库技术,在计算机仿真模型中,构建了包括毛坯、刀具、夹具及机床等部件的"真实"数控加工仿真环境.采用基于实体建模技术,布尔造型的方法,实现了数控加工过程刀具运动仿真、工件切削过程动态仿真以及碰撞干涉检验仿真.并建立了零件表面粗糙度的数学模型,预测三维零件的表面加工质量.     

数控机床加工仿真技术及应用

该文简要论述了数控机床加工仿真技术及其研究现状，介绍了目前国外成熟的数控机床加工仿真软件VERICUT，并且充分应用这种软件的各项功能进行了具体的机床加工仿真和干涉检查及代码优化。     

一种工业机器人切削加工的系统集成与仿真方法

本文以QH165工业机器人为例,提出了利用6R工业机器人与CAD/CAM系统集成的切削加工解决方案,论述了切削加工机器人与CAD/CAM系统集成化,包括在Solid Works软件中CAD建模和在Master CAM软件中选取五轴数控机床进行CAM加工;并针对该切削加工系统,重点推导后置处理过程中机器人运动学正逆解和轨迹优化算法,在Unity3D引擎中建立仿真平台,模拟仿真机器人运动。实验结果验证了该系统设计和轨迹优化算法的正确性。     

VERICUT仿真技术在数控加工工厂中的应用

VERICUT软件是美国CGTECH公司开发的数控加工仿真系统,由NC程序验证模块、机床运动彷真模块、优化路径模块、自动比较模块和CAD/CAM接口等模块组成,可仿真数控车床、铣床、加工中心和多轴加工中心等多种加工设备的数控加工过程,也能进行NC程序优化,缩短加工时间,检查过     

关于数控自动编程加工的后处理问题

当前制造业在应用数控技术中,越来越多的人员开始使用CAM系统实现自动加工。CAM系统的使用通常会遇到一些关于如何生成被数控机床接受的后处理程序问题。例如,如何定位数控机床,使其能按照在CAD中建立的模型准确加工;如何按照不同的机床控制系统定义不同的处理程序,即如何生成符合自己使用要求的数控NC文件;如何实现与数控机床的文件传输等。通常CAM软件处理问题的过程如下:三维造型→生成刀路NCI文件→符合各种CNC机床控制系统要求的NC文件。这就是说,NCI文件是一个过渡性文件,最终起作用控制机床的是NC文件,也就是符合各种CNC…     

针对产品的CAD／CAM一体化技术

本文系统地介绍了一种基于ＣＡＤ工作站，利用Ｉ－ＤＥＡＳ软件实现的针对壳体类零件的ＣＡＤ／ＣＡＭ一体化技术。论述了利用ＰＥＡＲＬ数据库实现的从ＣＡＤ模型到ＣＡＰＰ之间信息的传输，分析了在ＣＡＤ与ＣＡＭ集成中创成式ＣＡＰＰ所起的关键作用，并介绍了利用ＧＮＣ图形辅助数控软件对加工过程的仿真以及机床文件的准备，最后系统能生成正确的数控指令。系统初步实现了ＣＡＤ／ＣＡＭ一体化。     

基于G代码的工业机器人的自动编程

随着自动化程度的提高和CAD/CAM技术的发展，工业机器人常见的手工示教编程 已经不能满足需要，利用CAD/CAM软件实现机器人自动编程是工业机器人发展的必然趋势． 本文分析了利用通用G代码实现机器人自动编程的可行性，在考虑了数控机床与机器人坐标 系统的差异的基础上，具体研究了G代码程序到机器人工作程序的转换算法，并从编程的角 度，对轨迹仿真、差错检验以及动态优化进行了讨论．     

Development of a collaborative CAD/CAM system

This paper presents the development of a collaborative CAD/CAM system (COCADCAM). COCADCAM extends an existing single-location CAD/CAM system to a multi-location CAD/CAM application so that two geographically dispersed CAD/CAM users can work together on a three-dimensional CAD-geometry coediting and CAD-related tasks collaboratively and dynamically. COCADCAM dynamically supports CAD data communication that are not available in traditional single-location CAD/CAM. The dynamic data communication is achieved through the development of networking algorithms and CAD/CAM functions in this paper. The networking algorithms based on UNIX Interprocess Communication (IPC), the Network File System (NFS), and a connection-oriented client and server model under the Transmission Control Protocol/Internet Protocol (TCP/IP) suite. The CAD/CAM functions included surface modelling, simulation of a milling toolpath, and post-processing of an NC program following collaborative CAD-geometry coediting, which are directly or indirectly supported by the Application Programming Interface (API) of the CAD/CAM software. The networking algorithms and CAD/CAM functions together can facilitate an environment for CAD-geometry coediting and related tasks such as design, analysis and manufacture. COCADCAM has been successfully implemented through local area network (LAN) and the Internet; a remote machining cell is also linked so that the generated NC program based on a coedited free-form surface can be used for the physical machining operation. The algorithm proposed by COCADCAM can be referenced for the extension of other single-location CAD/CAM systems to multi-location applications.     

STEP-NC based high-level machining simulations integrated with CAD/CAPP/CAM

With the development of manufacturing,numerical control(NC) machining simulation has become a modern tool to obtain safe and reliable machining operations.Although some research and commercial software about NC machining simulations is available,most of them is oriented for G&M code.It is a low-level data model for computer numerical control(CNC),which has inherent drawbacks such as incomplete data and lack of accuracy.These limitations hinder the development of a real simulation system.Whereas,standard for the exchange of product data-compliant numerical control(STEP-NC) is a new and high-level data model for CNC.It provides rich information for CNC machine tools,which creates the condition for an informative and real simulation.Therefore,this paper proposes STEP-NC based high-level NC machining simulations solution integrated with computer-aided design/computeraided process planning/computer-aided manufacturing(CAD/CAPP/CAM).It turned out that the research provides a better informed simulation environment and promotes the development of modern manufacturing.     

CM,RE和CAD/CAM系统集成环境的研究

对三坐标测量系统、联系实际向工程、CAD/CAM系统信息集成中存在的问题进行分析，提出了面向快速逆向设计和制造集成环境的功能模型、关键技术和处理方法。通过建立CM，RE，CAD/CAM系统的集成平台，对样件、模型进行快速测量，并对测量数据进行数据处理、特征重建、几何造型和数控加工处理，以实现对产品样件或模型的快速逆向设计与制造。     

基于IGES接口的电磁计算模型数据交互

现今武器大多是利用非均匀有理B样条(non-uniform rational B-spline,NURBS)数学表述,在CAD/CAM系统下完成建模和重构.利用电磁计算软件运算武器模型的雷达散射截面(radar cross section,RCS)从而评估其隐身性能,就需要与CAD/CAM系统进行数据交互.通过对基本图形转换规范(initial graphics exchange specification,IGES)数据标准的分析,为电磁计算软件编译了IGES数据接口.该数据接口具备IGES文件数据导入和模型数据导出另存为IGES文件格式的功能,从而实现了自行开发的计算软件CRCS v1.2和CAD系统软件的数据交互,提高了软件处理复杂模型的能力进而使模型重构与计算趋于一体化.     

Automation in the design of EDM electrodes

Plastic parts, especially those designed for consumer electronics products, are becoming more compact and freeform in shape. This requires the construction of compact and delicate geometric features in the injection moulds that produce these parts. It is now common practice to employ electric discharge machining (EDM) whenever the conventional machining process fails to machine such delicate features. Although CAD/CAM systems are widely used in mould design and manufacturing, and specific commercial CAD/CAM systems that are customized for injection mould applications are also available, there are still no intelligent CAD tools that address the specific requirements of EDM electrode design. The aim of this research is to develop an intelligent CAD tool that supports EDM electrode design. This CAD tool uses a new technique that recursively splits the EDM region into sub-regions until machinable electrodes can be constructed. The CAD tool has been implemented and integrated into a commercial CAD/CAM system, and 40 different real designs has been used to test its capability in handling a wide variety of geometric shapes. Performance data show that the efficiency of the design process can be improved by at least 50%, with a potential to achieve 85% through improved implementation and further research.     

A system for CAD/CAM software development and implementation

Some approaches to CAD/CAM software are presented based on the experience gained by the authors from the development and implementation of several such systems. The metamonitoring system MEMO and two examples of its implementation in mechanical and civil engineering are described. MEMO implies the family of complex multi-task software which can be used as a tool for building integrated packages and as a monitoring system for controlling the problem solution processes. MEMO can be considered a kernel of the supporting environment for CAD/CAM systems software development and implementation.     

STEP信息集成软件工具的设计和实现

ＳＴＥＰ是国际标准化组织ＩＳＯ正在组织开发的应用于计算机集成制造系统（ＣＩＭＳ）信息集成的产品数据表达与交换标准，ＳＴＥＰ不仅是一种规范，更是一种信息集成技术，本文以ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成为背景，提出了ＳＴＥＰ信息集成支持工具ＥｘＴｒａ的设计和实现技术，该软件工具已成功且有效地应用于ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成中。     

Development of CAM system based on industrial robotic servo controller without using robot language

This paper describes the development of a robotic CAM system for an articulated industrial robot RV1A from the view point of robotic servo controller. It is defined here that the CAM system includes an important function which allows an industrial robot to move along cutter location data (CL data) consisting of position and orientation components. In addition, the developed CAM system has a high applicability to other industrial robots whose servo systems are technically opened to end-users. The developed robotic CAM system works as a straightforward interface between a general CAD/CAM and an industrial robot. At the present stage, the relationship between CAD/CAM and industrial robots is not well established compared to NC machine tools that are widely spread in manufacturing industries. The CAM systems for NC machine tools are already established, however, the CAM system for industrial robots has not been sufficiently considered and developed yet. A teaching pendant is generally used to obtain position and orientation data of the arm tip before an industrial robot works. Here, in order to enhance the relationship between a conventional CAD/CAM system and an industrial robot, a simple and straightforward CAM system without using any robot language is developed and implemented. The basic design of the robotic CAM system and the experimental results are presented in this paper.