典型薄壁结构件增材制造焊接路径规划优化算法

针对复杂曲面薄壁件的电弧增材制造引入有理B样条曲线求取成形轨迹.首先根据预制件三维模型提取轮廓数据建立轨迹曲线方程,自动生成成形路径;然后通过边缘曲线方程计算预制件在z轴方向上偏移量,进行高度补偿预测,提高分层精度,实现基于高度预测的分层算法优化.另一方面针对具有相交特征的薄壁件交叉点处焊高过高等问题,基于相反、相切成...

Welding path planning optimization algorithm for additive manufacturing of typical thin-walled structural parts

The rational B-spline curve was introduced to obtain the forming trajectory for the wire arc additive manufacturing of thin-walled parts with complex curved surfaces. Firstly, the contour data were extracted according to the 3D model of the perform and the trajectory curve equation was established, then the forming path was automatically generated. Secondly, the offset of the performance in the z-axis direction was calculated by the edge curve equation, and the height compensation prediction was carried out to improve the layering accuracy and optimized the layering algorithm based on height prediction. Thirdly, aiming at the problem of high welding height at the intersection of thin-walled parts with intersection characteristics, the optimal path was designed based on the idea of an opposite and tangent forming path, and the error caused by stress concentration and heat accumulation can be minimized. Finally, the corresponding weld sizes under different welding parameters were obtained by experiments, and the suitable welding parameters range was determined. The feasibility of the optimization algorithm was verified by forming experiments of typical complex thin-walled structures. The results showed that the path planning optimization algorithm improved the layering accuracy and realized the layering algorithm optimization based on height prediction. At the same time, the surface of the solid part was well-formed, and the forming dimension error was within the acceptable range, so this algorithm can be applied in the process of preparing thin-walled structures.