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根据激光强化的工艺特性,从优化的角度出发,提出了一种基于平行截面法的改进算法。首先通过分析光斑的平均离焦量与光斑覆盖域曲率的关系,得到用自由曲面最大主曲率表示的工艺所允许的最大光斑尺寸公式;进而通过轨迹样本点分析的方式,得到统计平均的相邻平行截面间距。该方法综合考虑光斑大小、光斑间距、轨迹排距等多种因素,相较于一般的轨迹规划算法,能在保证加工效果的基础上有效提高加工效率。最后给出了一个算例,这一方法被用于汽车门板局部的激光强化加工轨迹规划,取得了良好的效果。
According to the process characteristics of laser enhancement, an improved algorithm based on parallel section method is proposed from the perspective of optimization. Firstly, by analyzing the relationship between the average defocus amount of the spot and the curvature of the spot coverage area, the maximum spot size formula allowed by the process represented by the largest principal curvature of the freeform surface is obtained. Furthermore, by means of the track sample point analysis, Parallel section spacing. Considering the various factors such as spot size, spot spacing and track spacing, the proposed method can effectively improve the machining efficiency compared with the conventional trajectory planning algorithm. Finally, an example is given. This method is used to plan the trajectory of the laser enhanced machining in the door panel of a car and achieves good results.