CATIA V5环境下基于产品数模的三坐标测量机测点自动采样

Automatic Acquiring of Measurement Points for CMM under CATIA V5 Based on Digital Model of Product[HS)]

摘要:

为了实现CAD与CAIP(计算机辅助测量规划)的集成,提出了一种基于产品三维模型的CMM(三坐标测量机)测量点采样方法。该方法从产品的IGES文件中有效识别型面形状与边界定义,采用均匀采样与依曲率变化二次采样相结合的策略,针对各个型面类型制定专门的信息处理机制,实现测量点的自动采样,并通过转换在参数平面中判断采样点与裁剪区域的隶属关系,以有效剔除无效采样点;通过典型飞机部件外形曲面的采样点生成结果表明,该方法能有效应用于飞机的测量规划中。

Abstract:

To integrate the CAIP system with the CAD system,a sampling approach of measurement points for CMM based on the 3D digital model of product is proposed. The method identifies shape and boundary information from IGES files with respect to the product. After that,it carries out special mechanism for each type of surface shape,to acquire measurement points automatically,based on algorithm of combining the even sampling method with the equal curvature sampling method. In addition,the delete of invalid measurement points is performed by transforming the judgment of membership of the measurement point and the cutting area into the parameter plane of the surface. Practical examples of generating measurement points of typical aircraft shapes show that the proposed approach can be applied to the measurement plan of aircraft shapes effectively. 