基于NURBS插补算法的汽轮机叶片数控加工  

NURBS Interpolation Algorithm for Turbine Blade in NC Machining

作　　者：乐英[1] 王颖[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071000

出　　处：《组合机床与自动化加工技术》2017年第1期78-81,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：河北省自然科学基金项目(E2014502042);中央高校基本科研业务费专项资金项目(11QJ61)

摘　　要：为了提高汽轮机叶片的加工精度,文章通过分析汽轮机叶片的结构特点,采用一种NURBS曲线插补算法对其进行插补仿真。文章所采用算法由两部分组成:速度规划和参数计算。首先速度规划采用简化的五段S曲线加减速控制方法,保证了叶片在高速加工过程中加速度的连续,使机床运行平稳,然后利用牛顿迭代法来计算插补参数,得到更精确的插补参数,进一步提高了叶片的加工精度和加工速度。汽轮机叶片的插补仿真表明,该算法有高的稳定性和运算精度,并且使机床振动减小,速度波动小,保证了叶片的高质量加工。In order to improve the machining accuracy of turbine blade, a NURBS curve interpolation algo-rithm is used according to the structure features of the turbine blade,which included two parts of velocity planning and parameter calculating. First five phased S-curve acceleration and deceleration control method was adopted in velocity planning module. The accelerate speed is continuous when blade in high speed ma-chining process using the method and the CNC machine runs smoothly. Then the interpolation parameters are calculated using Newton iterative method. It gets more accurate interpolation parameters,the machining pre-cision and speed of the blade are more improved. The simulation test for interpolation of turbine blade shows that the algorithm has good stability, high computing precision. It can satisfy the requirements of the real-time interpolation,reduce machine tool vibration and limit the speed fluctuation in the real-time interpolation to the ideal level.

关 键 词：汽轮机叶片 NURBS插补算法 五段S曲线加减速控制 牛顿迭代法 

分 类 号：TH165[机械工程—机械制造及自动化] TG659[金属学及工艺—金属切削加工及机床]