IGES文件B样条曲线的激光扫描投影方法研究

Study on laser scanning projection method of B-spline curve in IGES file

激光扫描投影系统可以通过在目标面上投影出待投影零部件轮廓线框的方式来辅助工人装配,使用该系统进行辅助装配可以有效解决由传统装配方式所引起的效率慢、精度低等问题。为了解决自研激光扫描投影系统不能直接读取零部件外形数模,影响激光扫描投影系统的实际应用价值,拖慢工作效率等问题。提出了IGES文件B样条曲线的激光扫描投影方法研究,针对IGES初始化图形交互规范格式文件中应用在零部件外形设计中最广泛的B样条曲线实体类型进行了解析,并结合B样条曲线定义式推导得到曲线上点参数信息,在此基础上提出了基于IGES文件的扫描投影坐标提取和二维振镜扫描驱动文件生成的方法。实现了使自主研发的激光扫描投影系统可实现直接读取数模中复杂曲线的数据并进行投影,投影精度达到0.5mm。通过这种方法可有效的提高车间装配生产效率,使工业生产更加智能化、高效化。

The laser scanning projection system assists workers in assembling by projecting a contour frame on the target surface.Using this system for auxiliary assembly can effectively solve the problems of poor efficiency and low accuracy caused by traditional assembly methods.In order to make the self-developed laser scanning projection system directly read and project the data of complex curves in the digital model.The B-spline curve entity type is analyzed in the IGES(Initial Graphic Exchange Specification)file,and then a method for extracting scanning projection coordinates based on the IGES file and generating a 2 D galvanometer scan drive file is proposed.The self-developed laser scanning projection system can be realized to directly read the data of the complex curve in the theoretical model,and the projection accuracy can reach 0.5 mm.This method can effectively improve the production efficiency of workshop assembly and make industrial production more intelligent and efficient.