基于变形映射的多轴粗加工工序模型建立方法

Morphing Technology for Generating Intermediate Roughing Models in Multi-axis Machining

在多轴铣削加工中,建立准确的加工工序模型是实现航空类零件智能加工的关键技术。为了获得复杂零件准确的加工工序模型,提出一种基于变形映射的多轴粗加工工序模型建立方法。介绍变形映射技术的理论基础,建立三次埃尔米特超限插值的变形映射模型,并分析变形映射模型中影响工序模型几何形状的工艺参数;根据工艺约束的分析结果对工艺参数进行设计,并将带工艺约束的工艺参数引入到变形映射建模方法中来构造工序模型。在一类复杂航空零件上进行验证。算例表明,该方法能够在控制当前加工余量的情况下构造复杂零件多轴粗加工的工序模型,可缩短零件的总加工时间,在一定程度上改善了加工效率。

In multi-axis milling,establishing accurate machining process model is a key technology to realize intelligent processing of aviation parts.In order to obtain accurate machining process model of aviation complex parts,a method based on morphing technology to structure models of multi-axis roughing process is proposed.Firstly,the theoretical basis for morphing technology is introduced,the mathematical model of three Hermite transfinite interpolation for morphing technology is established,and the process parameters which impact geometry of process model in morphing technology is analyzed;according to the analysis of the process constraint to design the process parameters,and process parameters with constraints is introduced into the morphing technology to construct the process models.A validation is conducted on a class of complex aviation parts.The example shows that the method is able to structure process models of complex structure parts for multi-axis rough machining under the condition of controlling the machining allowance,and also can shorten the total processing time of the parts,to a certain extent,the processing efficiency is improved.