基于STL模型的五轴激光切割轨迹生成

Generation of 5-Axis Laser Cutting Path Based on STL Model

提出一种基于切口特征自动识别的五轴三维激光切割轨迹自动生成方法。采用STL模型,通过切口特征自动识别实现了切口特征的自动选取,并通过对切口边环的偏置实现了激光束半径补偿;利用切口边环的离散点确定了激光束入射点位置,并利用激光束入射点所在三角面片的法向量确定了激光头姿态;算法应用实例表明,该方法能够实现切口特征的自动选取和激光束半径补偿,并能保证激光头始终与工件表面保持垂直,软件系统运行稳定可靠。

A method for automatically generation of 5-axis 3D laser cutting path was proposed based on automatic recognition of incision features.Automatic selection of incision features was realized through automatic recognition of incision features using STL（stereo lithography） model.The laser beam radius compensation was done by offsetting of the edge loop of incision.The positions of laser beam focal points were decided according the discrete points on the edge loop of incision.The laser head posture was determined using the normal vector of triangle face on which the laser beam focal points was located.The case studies indicate that the method can automatically select incision features and carry out laser beam radius compensation automatically,at the same time can ensure the laser head perpendicular to the surface of workpiece all the time.The operation of software system is stable and reliable.