【作者】 夏语冰；

【导师】 张秋菊；

【作者基本信息】 江南大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 无心外圆磨削作为一种高精度的精加工工艺方法,在机械制造领域占有重要地位。无心外圆磨削仿真是指无心外圆磨削加工过程在虚拟环境中的映射,无心外圆磨削仿真系统是虚拟制造技术的重要组成部分,对无心磨削过程进行建模仿真,可以帮助设计人员检查制造中的问题,同时找到一种便利的方法来选择最佳的加工参数,必将获得巨大的经济效益。本文首先介绍了常用的软件开发流程,结合仿真系统开发流程的特点初步建立了无心外圆切入磨削仿真系统的开发流程。对照项目要求,初步拟定了系统的目标功能。通过对系统目标功能的详细分析,确定了无心外圆磨削仿真系统的总体构架和相关模块的设计思想。随后文章重点探讨了仿真系统实现的几个关键技术。在分析了OpenGL三维建模的优缺点后提出了3DS模型在仿真系统中的应用的思想。并对3DS文件格式构架及3DS模型在仿真系统中的读取与重现的具体方法进行了详细分析。在对目前主流数控仿真软件中对于工件表面三维形貌变化处理常用的三角网格离散仿真法分析的基础上结合无心外圆磨削的特点,指出了三角网格离散仿真在无心磨削应用中的不足。提出了仿真系统的动画设计思想以及利用OpenGL相关技术实现加工过程工件三维形貌变化的详细过程。同时又分析了布尔运算在加工过程二维动画仿真中的原理及优缺点,并在分析无心磨削加工特点的基础上,采用OpenGL混合技术实现了无心外圆磨削加工过程的二维动画仿真。在介绍无心磨削中工件中心高的理论计算方法的基础上提出了根据工件中心高的理论优化值计算托板高度的方法,并详细介绍了相关计算机程序的设计。同时通过计算机编程实现了在时域中表现工件真圆度的变化状态和实时的磨削力的输出。此外,文章还对工件自身存在的不平衡对于无心磨削的影响进行了相关分析。将工件的不平衡划分为轴向不平衡、径向不平衡和轴向径向同时不平衡三大类,然后分别对这三种情况进行了动力学分析,并通过Matlab计算绘制了各种情况下稳定磨削区域的范围,为进一步了解无心磨削的特性提供了有益参考。仿真系统经过测试具有良好的实时性、交互性以及较为真实的三维,二维动画显示能力,基本实现了仿真系统的设计目标。更多还原

【Abstract】 As a precision machining technique which can get high precision and low roughness, cylindrical centerless grinding has an important position in the field of mechanical manufacturing. The cylindrical centerless grinding simulation indicates a mapping of cylindrical centerless grinding process in the virtual environment. The cylindrical centerless grinding simulation system is an important part of virtual manufacturing. The simulation of centerless grinding processes could help the designer to identify the problems, and find a convenient method for optimal parameters in the processes of centerless grinding, then it will make enormous economic benefits.This paper first introduced the commonly used software development process, simulation system combining the features of the development process initially established a cylindrical centerless grinding simulation system development process. Then develop the objective function of the system according to the project requirements. Through a detailed analysis of the system goals, determine the cylindrical centerless grinding simulation system.Then the article focuses on the several key technologies used in simulation of the system.After analysis of the advantages and disadvantages of OpenGL 3D modeling,a method of using 3DS model in the simulation system is propounded. The paper makes a detail analysis of 3DS document format,reading and reproducing 3DS model in the simulation system .The article use OpenGL-related technology to achieve a detailed three-dimensional shape change process. Also analyzes the traditional method based on Boolean used in simulation of NC processing and brings forward a method based on OpenGL blending in 2D simuluation of centerless grinding processing. Compared with the traditional method this method is easier to carrying out and convenient for dynamic simuluation.After analysis the theoretical calculation method of the centrhigh, the paper proposed a method of the blade high calculation. At the same time, the method of computer programming in the time domain performance of the workpiece roundness of real-time changes in state and the grinding force of the output was carried out.In addition, the article also made some relevant analysis in the imbalance in workpieces.The imbalance of workpieces was divided into uneven axial, radial imbalance, radial and axial imbalance and then make a dynamic analysis through Matlab,it provided a useful referencea of the characteristics of centerless grinding.The running results of simulation system have shown that it has good real-time effectivity, interaction and visualization of 3D and 2D animation, and achieved the desired objectives.更多还原