自由曲面粗加工分层行切刀轨规划方法
Method of Layered Line Tool Path Planning for Rough Machining Free-Form Surface
王天力 1刘威 1范吕阳 1张嘉萍 1赵宇航1
作者信息
- 1. 苏州科技大学机械工程学院,苏州 215000
- 折叠
摘要
粗加工分层行切刀轨加工效率高、适用范围广,但在加工自由曲面时相邻行刀轨连接处容易产生过切或切削余量过大.针对三轴数控粗加工的不足,提出了一种分层行切刀轨规划方法:获取加工平面上的曲面轮廓,以初始刀轨与轮廓交点定义加工区域,并以交点邻域的局部轮廓计算出无干涉刀位点;向相邻行刀轨搜索不与轮廓线发生干涉的刀位点进行连接,对连接刀轨提出以精度为约束的离散特征点计算逼近误差的方法,通过新增过渡刀位点使最终的连接刀轨逼近误差低于最大允许值.所提出的方法对包含自由曲面的零件生成了刀轨,并进行仿真加工,结果验证了方法的可行性.
Abstract
Numerical control rough machining with layered tool path planning demonstrates high machining efficiency and wide applicability.However,when processing free-form surface,there is a tendency to en-counter issues at the connections of adjacent tool paths,such as overcutting or excessive cutting allowances.For three-axis numerical control rough machining,a method of layered line tool path planning is proposed.It involves obtaining the surface contour on the machining plane,defining the machining area by intersec-ting the initial toolpath with the contour,and calculating interference-free cutter location points based on the local contour around the intersection points.The method searches for connecting cutter location points be-tween adjacent tool paths that do not interfere with the contour lines.For the connecting tool paths,a meth-od is proposed to calculate the step error with precision constraints and discrete characteristic points.By adding transitional cutter location points,the final connecting tool paths achieve step error below the maxi-mum allowable value.The proposed method generates tool paths for a part with free-form surface and simu-lates the machining process.The results validate the feasibility of the method.
关键词
自由曲面/粗加工/行切刀轨/刀轨规划Key words
free-form surface/rough machining/line tool path/tool path planning引用本文复制引用
基金项目
江苏省自然科学基金(BK20210865)
中国博士后科学基金(2020M671604)
江苏省大学生创新项目(2020103320Z)
国家级大学生创新项目(202310332046Z)
出版年
2024
NETL
NSTL
万方数据