基于形心轴的多轴增材制造工艺规划方法

增减材混合制造是目前航空航天制造的关键技术之一,得益于五轴加工中心的旋转自由度,在增材过程中不断改变材料堆叠方向,理论上可实现零件的无支撑增材制造。然而,多轴姿态的引入增加了求解空间,极大提升了工艺求解难度。针对以上问题,提出了一种基于形心轴的多轴增材制造工艺规划方法。在形心轴定义的基础上研究了"柱状"特征形心轴的提取方法,垂直于形心轴方向进行切片,以此为基础构建了体积分解约束条件,自下而上搜索不满足约束条件的切片位置,在该位置将零件模型进行分解,并以该处形心轴方向作为新的材料堆叠方向,持续搜索直至分解完成。最后设计了零件模型,通过试验验证了方法的可行性,实现了零件的无支撑增材制造。

Multi-Axis Additive Manufacturing Process Planning Method Based on Centroid Axis

Additive and subtractive hybrid manufacturing is one of the key technologies for aerospace manufacturing at present.Owing to the rotational degrees of freedom provided by five-axis machining center,the build direction can be continuously changed during additive manufacturing(AM)process,which can theoretically eradicate support structure.However,the introduction of multi-axis motion capacity increases the solution space,which poses great challenge for finding the solution of the process.In view of the above problem,a multi-axis AM process planning method based on centroid axis was proposed.On the basis of the definition of the centroid axis,the extraction method of centroid axis with"columnar"feature was studied,and sliced perpendicular to the centroid axis direction.Accordingly,the volume decomposition constraint was constructed.The slice position that dissatisfies the constraint was searched from the bottom to the top,where the part model was decomposed,and the direction of the centroid axis was used as the new build direction.The search was continued until the decomposition was completed.Finally,the part models are designed,and the feasibility of the method is verified through experiments,and support-free additive manufacturing of parts is realized.