论文部分内容阅读
为了提高选区激光熔化(SLM)成型悬垂结构的质量,从调节成型方向和能量输入入手研究悬垂结构的计算机辅助工艺参数优化。以减小零件模型整体难成型悬垂面的面积为目标,以零件模型非成型方向的两个旋转角度为优化变量,建立成型方向的优化模型,并基于遗传算法实现优化模型参数的求解。通过遍历零件模型中的所有三角面片,建立倾斜角静态查找表,并在成型时查表实现能量输入的实时调节。实验结果表明,经成型方向优化,零件模型难成型悬垂面的面积从555.12mm2减小为16.211mm2,所需支撑数量明显减少;成型后所得零件无明显悬垂物和翘曲变形,成型质量明显改善。
In order to improve the quality of constitutive laser melting (SLM) overhanging structure, computer-aided process parameters optimization of overhanging structure was studied by adjusting forming direction and energy input. In order to reduce the area of the difficult to shape overhang of the whole part model, the optimization model of the forming direction was established based on the two rotation angles of the non-forming part of the part model, and the optimization of the model parameters was solved by genetic algorithm. By traversing all the triangular patches in the part model, a static look-up table of tilt angle is established, and the real-time adjustment of the energy input is realized when looking up the table. The experimental results show that after the forming direction is optimized, the area of difficult-to-shape overhanging surface of the part model is reduced from 555.12mm2 to 16.211mm2, and the number of required supports is obviously reduced. After the forming, the obtained part has no obvious overhang and warpage, and the forming quality is obviously improved .