The Light Plane Calibration Method of the Laser Welding Vision Monitoring System

[摘要] According to the aerospace and automobile industry, the sheet steels are the very important parts. In the recent years, laser welding technique had been used to weld the sheet steel part. The seam width between the two parts is usually less than 0.1mm. Because the error of the fixture fixed can't be eliminated, the welding parts quality can be greatly affected. In order to improve the welding quality, the line structured light is employed in the vision monitoring system to plan the welding path before welding. In order to improve the weld precision, the vision system is located on Z axis of the computer numerical control (CNC) tool. The planar pattern is placed on the X-Y plane of the CNC tool, and the structured light is projected on the planar pattern. The vision system stay at three different positions along the Z axis of the CNC tool, and the camera shoot the image of the planar pattern at every position. Using the calculated the sub-pixel center line of the structure light, the world coordinate of the center light line can be calculated. Thus, the structured light plane can be calculated by fitting the structured light line. Experiment result shows the effective of the proposed method.

[发布机构] Laboratory of Non-traditional Machining and Functional Material Preparing, College of Mechanical Engineering, Dalian University, Dalian; 116622, China^1

[效力级别] 无线电电子学

[关键词] Calibration method;Computer numerical control;Line structured lights;Monitoring system;Structure light;Structured Light;Welding quality;World coordinates