装夹方案快速设计与误差评价技术研究

发布时间：2018-05-15 10:26

本文选题：装夹方案 + 参数化快速设计　；参考：《西南交通大学》2016年硕士论文

【摘要】：为提高装夹方案设计效率,缩短夹具准备时间,实现定位和夹紧变形误差快速评价,编制了装夹方案快速设计与误差评价系统,运用该系统可以实现夹具的参数化和模块化快速设计、误差快速评价等功能,进行的主要研究工作如下：(1)通过对装夹方案设计过程进行研究,采用参数化设计理念建立了装夹实例库,主要包括参数化的元件库和组件库。以建立的实例库为基础,采用基于实例的推理技术研究了装夹设计知识的快速重用方法。(2)通过对定位误差产生的原因进行分析,结合刚体齐次坐标变换原理等数学方法,建立了定位误差评价数学模型,通过程序实现了误差快速评价,由夹具定位元件制造公差和工件定位特征制造公差推导出任意加工位置处由于定位误差可能产生的最大加工误差。(3)通过有限元分析技术计算夹紧变形导致的工件加工位置处三向误差变化量,结合夹紧变形和定位误差分析结果建立综合轮廓法向误差评价方法。以工件加工位置处的轮廓法向误差作为统一的评价指标,同时对工件定位误差和夹紧变形误差进行评价。(4)选用Microsoft Visual Studio 2008开发平台作为开发工具,通过C++语言和CATIACAA二次开发工具开发了装夹方案快速设计与误差评价系统,结合图例说明了系统开发的总体构架等相关内容。通过采用参数化设计、模块化设计、基于实例的推理和二次开发等技术针对夹具的快速设计与误差评价问题进行了研究,在一定程度上能够提高方案设计的效率和质量。
[Abstract]:In order to improve the design efficiency of the clamping scheme, shorten the preparation time of the fixture, and realize the quick evaluation of the positioning and clamping deformation error, a quick design and error evaluation system for the clamping scheme is developed. The system can be used to realize the parameterized and modularized fast design of fixture and the rapid evaluation of error. The main research work is as follows: 1) the design process of clamping scheme is studied. The clamping case library is established with the idea of parameterized design, which mainly includes parameterized component library and component library. Based on the established case library, the rapid reuse method of clamping design knowledge is studied by using case-based reasoning technology. By analyzing the causes of positioning errors, combining with the principle of rigid body homogeneous coordinate transformation and other mathematical methods, this paper studies the method of quick reuse of clamping design knowledge. The mathematical model of positioning error evaluation is established, and the rapid error evaluation is realized by the program. According to the manufacturing tolerance of fixture positioning element and the manufacturing tolerance of workpiece positioning feature, the maximum machining error caused by positioning error at any machining position is derived. 3) the clamping deformation of workpiece is calculated by finite element analysis technique. The change of three directions error at the processing position, Combined with the analysis of clamping deformation and positioning error, a synthetic contour normal error evaluation method is established. Taking the normal error of the contour at the machining position of the workpiece as the unified evaluation index, and evaluating the positioning error and clamping deformation error of the workpiece, the Microsoft Visual Studio 2008 development platform is chosen as the development tool. The quick design and error evaluation system of clamping scheme is developed by using C language and CATIACAA secondary development tool. The overall framework of the system is illustrated with legend. By using parameterized design, modular design, case-based reasoning and secondary development, the rapid design and error evaluation of fixture are studied. To a certain extent, the efficiency and quality of scheme design can be improved.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG75

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