一种改进的型腔粗铣加工可行刀具序列构建方法

An Improved Method for Generating Feasible Tool Sequences of Pocket Rough Milling

刀具序列优化对提高型腔粗铣加工的效率具有显著的作用,构建可行刀具序列是刀具序列优化过程中的重要环节.为此提出一种改进的型腔粗铣加工可行刀具序列构建方法.通过对现行的基于有向图的可行刀具序列构建方法进行分析,指出对刀具进行近似纯数学上的排列组合使得解空间偏大,进而制约刀具序列优化效率是该方法的主要不足;分析刀具在组合过程中产生的利与弊,建立一种用于判断刀具序列是否有效的分析模型,并将该模型引入至现行的可行刀具序列构建方法中,加强对解空间的约束,从而得到一种改进的、可预先排除大部分无效序列的新方法;最后对包括刀具组合有效性计算方法等在内的实现技术进行了研究.算例结果表明,改进后的方法在排除无效刀具序列上效果明显,对实现刀具序列的高效优化具有良好的促进作用.

Tool sequences optimization （TSO） can largely promote the efficiency of pocket rough milling. As an important link of the TSO process, an improved method for generating feasible tool sequences （FTS） is proposed. The analysis of the current FTS generation method based on directed graph indicates the method constructs oversize solution space due to its approximately pure mathematical permutation and combination, which restricts the optimization performance. In order to improve the current method, based on analyzing the advantages and disadvantages generated in the process of tools combination, an analytical model for judging the validity of tool sequences is established. By importing this model to the current method, a large amount of the invalid tool sequences are eliminated from the solution space, thus the optimization performance is accordingly promoted. The implementation techniques, including the tool sequences validity analysis, of the new method are studied. The case study shows the obvious effect of the improved method in eliminating invalid tool sequences.