基于分层递阶模型的多轴加工过程分析与运动度量规划  

Analysis and Motion Planning for Multi-axis Machining Process Based on Hierarchical Model

作　　者：张立强[1] 王宇晗[2] 

机构地区：[1]上海工程技术大学机械工程学院,上海201620 [2]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2011年第11期1715-1719,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50875171);上海市优秀青年教师资助项目(gjd09003)

摘　　要：针对复杂曲面多轴数控加工过程的复杂性,提出了一种面向多轴加工的分层递阶构造模型,即利用铣削过程的几何、运动学与力学模型综合分析多轴加工规律.切削工件几何模型采用深度元素法,通过分析刀具与工件接触区域,得到刀具在不同瞬时的轴向范围及沿轴向各微元的切入角和切出角,转换为铣削力模型所需的几何信息,同时运动学模型又为几何与力学模型提供计算依据.采用序列二次规划法优化进给速度,使机床工作在多个约束条件的最大范围值内.五轴螺旋桨加工实验表明,在满足加工精度条件下,优化的进给速度使零件加工效率提高约20%.For complex surface multi-axis machining process,a complete hierarchical model for multi-axis milling was presented.The geometric model,kinematics model and mechanistic model are integrated to analyse the machining methods.The method selected for geometric stock modeling is the dexel approach.The cutter workpiece engagement defines the instantaneous intersection boundary between the cutting tool and the in-process workpiece.From the CWE,the cutter entry-exit angles and depth of cuts are found and used to calculate the instantaneous cutting forces.The kinematics model also supports the calculation of workpiece updating and cutting force during the multi-axis milling process.The constrained optimization is solved by sequential quadratic programming and the machine operates at threshold levels.The production time in a flank milling propeller was reduced considerably to 20% with the satisfaction of precision demand.

关 键 词：多轴 分层递阶 几何仿真 力学模型 运动规划 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]