Abstract:

Contour-parallel offset(CPO) tool path was used widely in the rough machining process for dental restoration. In order to minimize the number of tool-retractions which did not contribute to the actual cutting and optimize the links between tool path loops(TPLs), a CPO tool path linking algorithm based on single root TPLs tree data structure was presented. With the parent/child relationship built during the calculation of TPLs, a single root TPLs tree was constructed, and then it was divided into many subtrees according its topology, as a result all TPLs were split into several grouped TPLs. TPLs in each group were linked by linking point pairs. Finally, a CPO tool path without tool-retraction can be generated by traveling TPLs tree. Several testing results show that this method can obtain CPO tool path without tool-retraction effectively.

Key words: tool path topology, tool path without retraction, tool path tree, dental restoration machining

摘要：

在口腔修复体数控粗加工中环切走刀方式应用广泛,为了减少加工时刀具跳刀次数以缩短空走刀时间和优化刀轨环之间的过渡连接,提出了基于单根树结构的环切刀轨无跳刀过渡连接算法。在该算法中,根据刀轨环计算过程中建立的父子关系构建刀轨环树,然后对刀轨环树拓扑分解实现刀轨环编组,编组环集合中具有父子关系的刀轨环之间通过“过渡点对”构建过渡连接关系,最后遍历刀轨环树获得无跳刀刀轨。实验表明,该算法无跳刀,无重复切削,满足实际加工要求。
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关键词: 刀轨拓扑, 无跳刀刀轨, 刀轨环树, 口腔修复体加工