五轴联动数控加工进给率规划方法  

Method of Feed Rate Planning in Five-axis Machining

作　　者：郑焱[1] 毕庆贞[1] 王宇晗[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海2002400

出　　处：《组合机床与自动化加工技术》2011年第7期1-4,8,共5页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家"863"重点项目(2009AA04Z150v);国家自然科学基金项目(50875171);中国博士后科学基金(00470687)

摘　　要：针对五轴联动数控加工中恒定机床进给率下加工刀尖点速度波动的问题,提出了同时考虑机床坐标系和工件坐标系下运动学性能约束的进给率规划方法。首先推导了机床坐标系和工件坐标系之间的运动学变换关系,然后综合考虑了机床各轴运动速度和加速度约束条件,以及刀尖点与工件相对运动速度与加速度约束条件,对各程序段中的机床进给速度进行规划。将该方法主要应用于后置处理,仿真结果表明,规划进给率后,加工时间比恒定进给速度下缩短了32.9%,加工速度更为平滑。This paper proposes a feed rate planning method to solve the velocity fluctuation problem in both machine tool coordinate system and the workpiece coordinate system.The velocity fluctuation of the tool tip point,which occurs in simultaneous five-axis NC machining if a constant feed rate is used,can be decreased.The kinematic transformation between the machine coordinate system and the workpiece coordinate system is first derived.The feed rate in every block of the NC code is then generated by considering the velocity and acceleration constraints in the two coordinate systems.The developed method has been integrated into a post-process system.Simulation results show that the machining time with the generated feed rate is 32.9% shorter than that of the constant feed rate,and the velocity of the tool tip point becomes smoother.

关 键 词：五轴加工 机床坐标系约束 工件坐标系约束 进给率规划 

分 类 号：TH16[机械工程—机械制造及自动化] TG65[金属学及工艺—金属切削加工及机床]