基于线结构光传感器的汽车后横梁前板尺寸测量  

Front Plate Dimension Measurement of Automobile Rear Cross Beam Based on Line Structured Light Sensor

作　　者：杨金祥 章海 陈胜 YANG Jinxiang;ZHANG Hai;CHEN Sheng(College of Marine Engineering Equipment,Zhejiang Ocean University,Zhoushan 316000,China)

机构地区：[1]浙江海洋大学海洋工程装备学院,浙江舟山316000

出　　处：《机械工程师》2021年第11期84-86,共3页Mechanical Engineer

摘　　要：汽车后横梁前板是前保险杠后面的第一根横梁,该总成零件的生产效率和生产精度是冲压过程中需要考虑的重要环节。针对汽车后横梁前板生产过程中边线、孔径、面轮廓等测量问题,设计了一种基于线结构光传感器的汽车后横梁前板测量系统。该系统使用CCD摄像机捕捉零件表面的结构光平面条纹,进而通过图像处理将二维图像转化为三维点云数据,基于特征值法拟合总成零件的点云平面去检测曲面的精度;通过总体最小二乘法拟合点云平面计算孔径尺寸。通过基于线结构光传感器的汽车零件测量系统,对于后横梁前板零件的各个点云平面的坐标测量,并对比分析测量坐标与标准坐标之间的公差,可知该系统的最大公差不超过0.01 mm,满足生产精度要求,与其他接触式测量系统相比,该系统可靠性强、安全性高,可实现非接触的实时快捷测量。The front plate of the rear cross beam of the automobile is the first cross beam behind the front bumper.The production efficiency and production accuracy of the assembly parts are important links that need to be considered in the stamping process.Aiming at the measurement problems of sideline,aperture and surface profile in the production process of the front panel of the rear cross beam of the automobile,a front panel measurement system of automobile rear cross beam based on the line structure light sensor is designed.The system uses a CCD camera to capture the structured light plane stripes on the surface of the part,and then converts the two-dimensional image into three-dimensional point cloud data through image processing,and fits the point cloud plane of the assembly part based on the feature value method to detect the accuracy of the curved surface.The least square method is used to fit the point cloud plane and calculate the aperture size.By measuring the coordinates of the various point cloud planes of the rear cross beam and the front plate parts of the automotive parts measurement system based on the line structured light sensor and comparing and analyzing the tolerance between the measured coordinates and the standard coordinates,it can be seen that the maximum tolerance of the system does not exceed 0.01 mm to meet the production accuracy requirement.Compared with other contact measurement systems,this system has strong reliability,high safety,and can realize non-contact real-time fast measurement.

关 键 词：后横梁前板 CCD摄像机 特征值法 总体最小二乘法 尺寸测量 

分 类 号：U466[机械工程—车辆工程]