基于实体造型的球头铣刀三维铣削力仿真  

Cutting Forces Simulation of Ball-End Milling Based on Solid Modeling

作　　者：倪其民[1] 李从心[1] 阮雪榆[1] 

机构地区：[1]上海交通大学塑性成形工程系,上海200030

出　　处：《上海交通大学学报》2001年第7期1003-1007,共5页Journal of Shanghai Jiaotong University

基　　金：教育部博士点基金资助项目 (980 2 4834)

摘　　要：提出了基于实体造型技术的复杂曲面球头铣刀三轴铣削加工过程三维铣削力仿真方法 .整个系统由几何仿真模块和物理仿真模块组成 .用基于 UG 的实体造型技术表示工件、刀具、刀具扫描体以及被切除材料实体 ,用分段三次 NURBS曲线表示刀具切削刃 ,通过 NURBS曲线和被切除材料实体之间的求交运算 ,抽取参与切削的切削刃片段 .基于切削力与切屑几何之间的经验关系 ,用数值积分方法建立了球头铣刀三分量铣削力模型 .在径向未变形切屑厚度公式的推导中 ,考虑了刀具进给运动的三维特点 .在铣削力系数模型中 ,考虑了切屑厚度变化对铣削力影响的指数关系和铣刀球头部分不同位置切削微元不同切削条件的特点 .实例计算表明 。A ball-end milling process simulation system for automatic prediction of cutting forces was developed. The geometry of the workpiece, the cutter, and the cutter/workpiece engagement is modeled using a geometric simulation system, which uses a commercial solid modeler (UGII) as a geometric engine and can accurately extract the chip geometry for general 3-axis ball-end milling operations. On the basis of the empirical relationship between cutting forces and undeformed chip geometry, a three-component force model is developed to calculate instantaneous ball-end milling cutting forces by a numerical integration method. The three-dimensional characteristic of cutter feed motion is considered in the formulation of undeformed radial chip thickness. The influence of exponential relationship of chip thickness variation on the cutting force and the cutting action variation along the cutting edge are considered in the cutting force coefficient model. The applicability of the developed system is demonstrated through a ball-end milling test and its validity is checked by comparing simulated cutting forces with experimental ones.

关 键 词：球头铣刀 铣削力 实体造型 几何仿真 物理仿真 分段三次NURBS曲线 切削厚度 

分 类 号：TG54[金属学及工艺—金属切削加工及机床] TP391.9[自动化与计算机技术—计算机应用技术]