摘要
文章提出采用非均匀有理B样条表示整体波轮自由曲面,基于孔斯曲面构造生成波轮空间曲面的造型设计方法;同时为避免复杂曲面加工中瓶颈干涉现象,提出将圆环面铣刀等效为变直径平底铣刀,基于圆环面铣刀有效切削轮廓曲率与刀触点曲面法曲率匹配,初定刀具姿态,利用交线上干涉点数据计算并调整刀具姿态,以避免切削刃后缘和侧缘过切被加工表面;在详细分析加工工艺基础上完成了整体波轮的仿真加工和数控加工,验证了设计及加工方法的正确性、合理性。
In this paper,non-uniform rational B-spline （NURBS） is proposed to express the freeform surface of integral impeller and its modeling design is constructed based on Coons surface.In addition,in order to avoid the bottle neck interference phenomenon in machining complex surface,the torus milling cutter is equalized to the variable diameter fiat end cutter,the posture of the cutter is initially determined based on the match of the effective cutting profile curvature of the torus milling cutter and the surface curvature of the cutter contact point.In order to avoid the trailing edge and the lateral edge of the cutting edge over cutting the machined surface,the data of the interference points on the intersection lines are used to calculate and adjust the cutter orientation.Based on the detailed analysis of process technology,the stimulation and numerical control machining of the integral impeller are finished.It verifies that the design and machining methods are correct and reasonable.
出处
《组合机床与自动化加工技术》
北大核心
2013年第12期122-125,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家自然科学基金项目(51075198)
江苏省自然科学基金项目(BK2010479)
南京工程学院创新基金项目(CKJ2011004)
南京工程学院高等教育研究项目(GY201112)
关键词
自由曲面
非均匀有理B样条
孔斯曲面
干涉避免
freeform surface
non-uniform rational B-spline （NURBS）
coons surface
interference avoidance
