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中文摘要：
型腔加工是现代数控加工中广泛面临的一类加工问题。刀具筛选是型腔粗加工刀具序列优化过程中的一个重要环节。现有的基于几何、设备和工艺等约束的刀具筛选方法并不能判别因刀具之间相互制约而产生的冗余刀具,降低了刀具序列优化的效率。通过对比刀具组合过程中因不同刀具的优势互补而产生的效益增量与因换刀带来的相关效益损失量,建立一种用于判断刀具序列是否有效的分析模型;在此基础上,从刀具序列的组合形态的角度构造并证明一种可以判别部分冗余刀具的规则,并将其与基于几何、设备和工艺等约束的刀具筛选方法相串联,得到一种可支持刀具序列高效优化的刀具筛选方法;研究新方法的实现技术,包括刀具加工能力的估算方法和刀具组合有效性的计算方法;算例结果表明所提方法在去除冗余刀具上的效果明显,能为刀具序列的高效优化提供有效支持。
英文摘要：
Pockets with complex geometry are usually machined on CNC machining tools,and the optimization of tool sequence significantly affects the rough machining time.In the process of tool sequence optimization,screening cutters is a basic work.However,most cutter screening methods are based on constraints extracted from pocket geometry,machining tools,and machining process,and rarely take constraints between cutters into consideration;thus,redundant cutters appear in feasible cutter set.A mathematic model is established for estimating validity of tool sequence by comparing benefits increment generated from cutters combination with benefits decrement generated from the tool-change process,in addition,a redundant cutter judging rule based on the model is constructed and demonstrated from the point of cutters combination forms.By connecting the existing cutters screening methods and the new rule for judging redundant cutters,a new cutters screening method for high performance tool sequence optimization is obtained.The technologies of the new method including the method for estimating cutter＇s machining ability and the method for calculating validity of tool sequence are studied.A case study is introduced,which proves the practical value of the presented method.
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