拱架式贴片机贴装路径优化

贴片机工作时贴装头需在喂料器与印刷电路板之间频繁移动，缩短贴装头移动距离是提高贴装效率的重要途径。对多头拱架式贴片机贴装路径优化问题进行研究，分析贴装头沿喂料器移动取料时贴装路径变化，建立贴装头移动距离表达式。以贴装头移动距离最小为目标建立贴装路径优化模型，以贴装位置编号对取贴顺序编码，利用遗传算法对取贴顺序和取料方向进行优化。分析不同取料方式下贴装路径差异和结构特点，结果表明：双向取料与近侧取料在贴装点位置分布偏于PCB单侧较多时出现结构性差异，采用双向取料可获得比近侧取料更短的贴装路径，更利于提高贴装效率。

Optimization of mounting path for arch style mounting machine

The mounting head needs to move frequently between the feeder and the printed circuit board when the mounting machine works. Shortening the moving distance of the mounting head is an important way to improve the mounting efficiency. Optimization of the mounting path for arch style mounting machine is studied. Variation of the mounting path that the mounting head moves along the feeder is analyzed, and the formula of moving distance is proposed. An optimization model is established with the goal of minimizing moving distance of the mounting head. The sequence of pick-and-place is coded by component mounting positions, and a genetic algorithm is used to optimize the sequence of pick-and-place as well as the moving direction of the mounting head. The differences and characteristics of the mounting path corresponding to different picking up methods is analyzed. The results show that there are significant differences between two-way and near side picking up especially when the distribution of points is more on one side of PCB. A shorter mounting path can be obtained by two-way picking up than by near side picking up. Therefor the two-way picking up is more useful to improve mounting efficiency.