关键词: 三角网格, 刀具组合, 刀轨长度估算, 区域分割, 干涉查找

Abstract: To increase the NC machining efficiency of the complex triangular mesh model, a new method of tool combination optimization is developed on the premise of demanded accuracy. Aiming at minimum tool-path length, the effects of the model differential geometry information on the machining efficiency and accuracy are taken into account. Firstly, the model is segmented into several feature sub-regions, and different tool path planning methods are adopted for different feature sub-regions. Then the more precise tool-path length estimation model is established. After selecting suitable standard tool combinations and estimating their path lengths, the cubic B-spline curve is fitted, and the minimum value is obtained by calculating the first derivative vector of the curve. Finally, the standard tool corresponded to the minimum value is selected as the optimal tool. The proposed method is programmed in the VC++ environment and is experimented, and the experimental results demonstrate the feasibility and validity of the method.

Key words: triangular mesh, tool combination, estimated tool-path length, region segmentation, interference detection