基于IGES的激光扫描投影文件解析方法研究

激光扫描投影仪能够实现待装配零部件线框轮廓的精准位置投影，能够大幅度改善由传统装配方式所引起的精度差，效率低等问题。为了在自主研发的激光扫描投影系统中实现可直接读取IGES（初始化图形交互规范）格式的三维数模激光投影，研究了多特征图元提取和文件自动生成方法。该方法通过提取待投影线框图形的点、线、面等数据特征，以元胞的方式存储在.ply格式文档中，通过.ply文件对数控开关进行延时控制以及对二维振镜轨迹进行操控，实现更加智能化地控制激光扫描投影。应用12个IGES格式图元的投影实验验证，该方法可实现所有图元清晰投影且激光轮廓线宽优于0.3 mm，通过这种新型投影系统可提高车间装配生产效率，改善装配精度。

Research on analytical method of laser scanning projection files based on IGES

The laser scanning projector can realize the precise position projection of the wire frame contour for the components to be assembled, and can also greatly improve the problems of low precision and low efficiency caused by the traditional assembly method. In order to realize the 3D digital model laser projection in IGES format that can be read directly in the independently developed laser scanning projection system, the multi-feature image primitive extraction and the automatic files generation method were studied. In this method, the data features such as points, lines, and surfaces of the wire frame graphics to be projected were extracted and stored as the cellular in the .ply format file. The delay control of the numerical control switch and the control of the 2D vibrating mirror track were carried out by the .ply format file, which realized the more intelligent control of the laser scanning projection. The projection experiment of 12 IGES format image primitives verify that the proposed method can achieve the clear projection of all the image primitives, and the laser contour width is better than 0.3 mm. The assembly efficiency of the workshop and the assembly precision can be improved by using this new projection system.