基于回转曲面性质的五轴粗加工叶轮流道方法研究

Research on Five-axis Rough Machining Impeller Runner Method Based on theNature of Surface of Rotation

针对叶轮流道的粗加工问题,提出了一种等切深均匀分层的加工策略,并针对叶轮流道宽度变化的特点,给出了采用平底刀铣削时每一层分层曲面边界的确定方法。针对任一层曲面,通过分析其几何形状和曲率变化,提出了一种基于回转曲面性质的刀具路径规划方法,用以解决传统分层法规划路径时,刀具路径冗余和计算量较大的问题,并针对刀具碰撞干涉问题,给出了一个刀轴矢量优化的方法,使其过渡更加平滑,最终用UG的二次开发功能实现了上述算法,并使用该软件的切削模块进行仿真,验证了上述方法的可行性。

Aiming at the rough machining problem of impeller runner,a machining strategy of equal cutting depth and uniform layering was proposed.According to the characteristics of impeller channel width variation,the method to determine the boundary of each layer of layered surface was given.Aiming at any layer surface,by analyzing the geometric shape and curvature changes,a tool path planning method based on the properties of revolution surface was proposed to solve the problems of redundant tool path and large amount of calculation when traditional hierarchical method was used to plan path.In addition,a tool axis vector optimization method was proposed to make the transition more smooth.The algorithm was realized by the secondary development function of UG,and the cutting module of the software was used to verify the feasibility of the above method.