摘要
随着汽车、航空航天等行业激光焊接应用的发展,含有非平行直线或曲线焊缝的剪裁激光拼焊板件快速增长,柔性的机器人激光焊应用也随之增加。但目前的大多数关节式工业机器人尚难以有效地追踪重复性不足的焊缝。集成了激光视觉传感的DIGI-LAS激光焊接头系统特别适合这些机器人或专机的激光焊应用。DIGILAS系统配置了2个激光传感器,一个用于焊前搜索、定位焊缝及焊缝跟踪,另一个用于实时检测焊缝,包括焊缝的成形尺寸和探测表面缺陷。此外,DIGI-LAS的激光传感器能够记录机器人追踪焊缝的误差,在焊接时给予补偿,保证了机器人系统可以满足激光焊的精度要求。经过补偿后,在超过6 m/min的焊接速度下,系统追踪曲率半径为50 mm的曲线焊缝的对中误差小于100μm。检测结果通过数字IO输出到机器人、PLC或外部的质量管理系统。自动的焊接质量检测有助于用户实现6σ的质量控制与管理。
With the increasing of laser welding application in both automotive and aerospace industries,laser tailor-welded blanks involving in both non parallel or curvilinear seams are needed more and more,which results a quick increase in the amount of robotic laser welding because it works well in these tailored welded blank applications.However,the present articulated industrial robots can not match the precision require- ment since there is no any efficient way to track the unrepeatable weld bead.To solve this problem,a laser vision seam tracker must be adopted, and the DIGI-LAS laser welding head system with integrated laser vision sensing is optimized for this exact purpose.This DIGI-LAS system includes two laser vision cameras:one for seam tracking and the other for real time weld inspecting which includes measurement of the weld size and detection of the surface defects.In addition,the laser vision camera is used to measure and record the robot tracking inaccuracy which can be compensated in welding process.After compensation,the alignment error is less than 100 μm in curve welding seam with a tracked curvature radius of 50 mm by this system when welding speed is more than 6 m/min.The inspection results are input through digital IO to the robot, PLC or external quality system according to the customer requirements.Automatic weld quality inspection helps a manufacturer achieve 6σ level quality.
出处
《焊接》
北大核心
2009年第5期30-35,共6页
Welding & Joining
