自由曲面的五坐标端铣加工研究  

Study on 5-axis End Milling of Free-form Surfaces

作　　者：吴宝海[1] 李山[1] 张定华[1] 王尚锦[2] 

机构地区：[1]西北工业大学现代设计与集成制造技术教育部重点实验室,西安710072 [2]西安交通大学,西安710049

出　　处：《中国机械工程》2007年第10期1135-1139,共5页China Mechanical Engineering

基　　金：国防基础科研项目(K0504020512);航空科学基金资助项目(05H53080)

摘　　要：针对自由曲面的五坐标端铣加工,建立了平底刀有效切削轮廓的数学模型,分析了刀具姿态对有效切削轮廓及加工效率的影响。沿行距方向,通过对被加工曲面法截线的偏置曲线与有效切削轮廓求交,得到一种走刀行距的计算方法。探讨了影响走刀行距的因素,在不发生干涉的前提下,小的后跟角和侧偏角有利于加工行距的提高。结合平底刀加工不发生过切的充要条件和被加工曲面沿行距方向的法曲率,给出了后跟角的自动计算方法。算例表明,所提出的走刀行距及刀具倾角的计算方法合理可行,能够有效提高计算精度和加工效率。Focusing on the 5-axis milling of free-form surfaces with the flat-end cutter, the mathematical model of the effective cutting shape corresponding to the cutter dimension and attitude was created. Based on this model, the influence of inclination angle and tilt angle on the machining efficiency was analyzed. A new method for determining the machining strip width of the flat end cutter was presented,which depends on the intersection points between the effective cutting shape and the offset curve of the normal transversal along the path interval direction on the machined surface. Meanwhile, the factors which affect the machining strip width were discussed herein. Under the precondition of non-gouging, smaller inclination angle and tilt angle will help to enlarge the machining strip width. Finally, with consideration of the sufficient and necessary non-gouging condition for end milling, a new approach to automatically calculate the inclination angle was proposed. In this approach, the inclination angle was determined by the normal curvature of the surface to be machined along the path interval direction. Examples show that the method is feasible and the result is with high accuracy and efficiency.

关 键 词：五坐标 端铣 走刀步距 有效切削轮廓 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]