摘要
针对中长型叶片加工出现的变形问题,基于切削力抵消的思想,提出叶片整体型面上的双刀纵切加工系统实现方案及轨迹规划方法。根据叶片型面特性和双刀对刀加工需求,建立双刀系统运动自由度分配方案;基于NURBS曲面的理论建立了叶片型面的参数化模型,建立牛鼻刀在空间姿态下加工复杂曲面的切削力计算的解析模型,在此基础上进行了双刀加工的轨迹规划。通过有限元计算对比单刀和双刀加工的变形。结果表明:优化后的路径在保证叶片整体表面质量的前提下能够有效地减小加工变形,整个叶片型面上的变形量平均减少了56.76%,为中长型叶片的高精双刀加工提供了一种实际解决思路。
A method of tool path generation for long turbine blades machined with twin-cutters is proposed to reduce the deformation.The movement system is designed which can realize the machine process with twin-cutters.The mathematics model of the blade is presented based on the NURBS surface,and an analytic model of cutting force of the bullnose cutter is also built.After that,the tool path is generated base on the designed system.Finite element analyses are carried out to compare the two kinds of schemes with one cutter and twin-cutters.The results show that the path with twin-cutters can effectively reduce the blade deformation by 56.76% on average,which is greatly helpful to machine the long blades accurately.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2016年第11期140-145,共6页
Journal of Mechanical Engineering
基金
国家科技重大专项资助项目(2011ZX04016-021)
关键词
汽轮机叶片
双刀
切削力
变形
轨迹规划
turbine blade
twin-cutters
cutting force
deformation
tool path generation
