基于空间轨迹规划与切片的GTAW填丝增材制造成形控制

Forming control of GTAW wire filling additive manufacturing based on spatial trajectory and slice

增材制造是基于3D模型逐层堆积以制造产品的过程。当前复杂零件的加工制造相对较难,文中提出了路径轨迹与切片联合的方法自动控制成形。通过建立模型,并对模型进行切片处理。试验以钨极气体保护焊为热源,6轴机器人为控制端。将基底坐标变换至钨极坐标,以模型切片后生成的路径轨迹为钨极坐标运动轨迹,实现最终的堆垛成形。基于路径规划与切片联合使用和传统钨极气体保护焊填丝增材制造试验表明:采用切片与路径规划对成形有较好的控制效果。比较实体结构件与三维模型之间的差异发现:实体结构件与模型的边长尺寸精度相同,壁厚较模型大1 mm,结构件与模型长度和厚度的精度较高,总体的高度较模型的高度低5 mm。

Additive manufacturing is a process of manufacturing products by stacking layer by layer based on 3D model.At present,it is relatively difficult to manufacture complex parts. In this paper,a method of combining path and slice is proposed to automatically control forming.,by establishing the model and slicing the model. In the experiment,tungsten gas shielded welding was used as the heat source and six axis robot was used as the control end. The base coordinates were transformed into tungsten polar coordinates,and the path trajectory generated after model slicing was taken as the tungsten polar coordinate motion trajectory to realize the final stacking forming. Based on the combination of path planning and slicing and the manufacturing test of filler wire additive in traditional tungsten gas shielded welding,it was shown that slicing and path planning had a good control effect on the forming. Comparing the differences between the solid structural parts and the three-dimensional model,it was found that the side length,the dimensional accuracy of the solid structural parts and the model were the same,the wall thickness was 1 mm larger than the model,the length and thickness accuracy of the structural parts and the model were higher,and the overall height was 5 mm lower than the model height.