H型钢端面尺寸的精密视觉检测方法

Precision Visual Inspection Method for the End Face Dimension of H-shaped Steel

在截面尺寸为300 mm 300 mm和400 mm 300 mm的H型钢的切割和焊接过程中,为了达到0.2 mm的测量分辨力要求,由CCD相机采集的图,通过计算机处理,测量型钢端部的几何尺寸及形变量,为焊枪的定位、切割提供坐标参数。针对型钢测量过程中需要解决0.7‰分辨力和大景深测量的问题,提出了一个大景深视觉成像测量的设计方案,给出了被测工件的实际测量结果,并做了测量重复性和稳定性分析。理论分析和实验及结果表明,该系统的分辨力达到0.2 mm,从采集图像到得出最后数据,处理时间满足工程要求。

In cutting and welding processes of the H-shaped steel whose section size is about 300（W） mmx300（H） ram, 400（W） mm×300（H） mm or larger, a vision inspection method is adopted and set up in work field actually. By CCD image processing and programming, this system can measure geometry size and deformation of the steel with the resolution of 0.2 mm, and provide coordinate parameters for orientation and position of cutting/welding torch. For the problem that needs 0.7%o resolution and large depth of field to measure the large section size of H-shaped steel, a vision imaging system is presented. From the actual measurement results, it can be seen that this system has a good measurement repeatability and stability. The theoretical analysis and experimental results show that the system achieves a resolution of 0.2 mm, and its processing time, from image capturing to final data uploading, meets the engineering requirements.