ADAPTIVE ASSEMBLY PLANNING FOR HIGH PRECISION ASSEMBLY SYSTEMS

利用基于组合优化方法的选择性装配，优化零件的组合，使得在适当参考每个零件的尺寸的同时以最大装配率在批次单元中获得高质量的装配单元。本研究所提出的组装方法，结合了基于组合最佳化方法的选择性组装与微细加工，以生产高精度的组装单元。该方法适用于孔类零件与轴类零件的高精度装配系统。此外，在零件组合的优化过程中考虑了用于校正零件尺寸的微加工，并试图通过模拟来验证性能。组装单元的质量得到优化，同时考虑到微加工，保持最大组装率。通过对零件组合优化方法的模拟，得到了以下结果。(1)该系统在小批量生产中是有效的，其中用常规方法不能获得更高的组装速率，使得如果同时使用微加工，则获得更高的速率。(2)采用预先考虑微细加工的零件组合优化方法，可以大大减少零件的最大微细加工尺寸和最大加工时间，增加接近理想状态的装配单元数。

With selective assembly based on the combinatorial optimization method, a combination of parts is optimized so that high quality assembled units are obtained in a lot unit at the maximum assembly rate while dimensions of each part are referred to appropriately. The assembly method proposed in this study combines selective assembly based on a combinatorial optimization method with micro machining so as to produce high precision assembled units. This method is applied to the high precision assembly system where hole parts are combined with shaft parts. Further, micro machining used for the correction of the dimensions of the parts is taken into consideration during the optimization of the parts combination, and it is attempted to verify the performance by simulation. The quality of the assembled units is optimized while preserving the maximum assembly rate taking micro machining into account. The following findings are obtained by simulating combinatorial optimization methods of parts.(1) This system is effective in a small lot production, where higher assembly rates can not be attained with conventional methods, in such that a higher rate is obtained if micro machining is used alongside.(2) With the combinatorial optimization method for parts where micro machining is taken into consideration in advance, maximum micro machining dimension and maximum machining time of the parts can be greatly reduced and the number of assembled units close to the ideal state is increased.