摘要
在综合考虑机床动静态因素的基础上,建立了各运动轴伺服运动模型和多体联动模型,给出了刀具的实际运动位置和姿态,基于包络理论求解了零件实际铣削成形点、线和层面,采用曲面造型方法构建出零件型面的综合误差。以复杂非可展曲面——"S"试件为例,进行了加工误差的预测和分析,给出了位置环、速度环等机床重要参数对工件铣削精度的影响,并通过切削试验后的数据回归分析予以验证。该平台的搭建为实现航空关键零件加工精度预测提供了技术支撑,依据计算结果可实时调整机床的动态参数,评估机床的加工状态。
Part accuracy in high-speed NC machining is often difficult to control, especial for large structure aviation. Small changes in some dynamic factors may lead to errors exceeding the allowable value. A method integrated machine on dynamic error factors and static geometric errors is presented to build the surface data of actual workpiece. Each servo axis movement is simulated and composed by kinematics of the joint bodies of the machine for calculating the actual position and attitude of the tool. The actual milling point is solved by the envelope theory and the final part of the surface is obtained by the surface forming method. A case study is analyzed through the ＆quot;S＆quot; specimen sample, which is verified the composition of surface methods and get the milling error in influence of dynamic factors, such as the gap, the position loop and speed loop. This method can estimate the milling accuracy on large parts in advance, and help to adjust the dynamic parameters of the complex servo system. It provides a basis for better precision control effect and economic costs.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2014年第5期787-793,共7页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(51205048)
中国博士后科学基金(2013M542265)
关键词
精度预测
航空整体结构件
动态误差
多轴数控机床
精度建模
accuracy prediction
aerospace monolithic component
dynamic error
multi-axis CNC machine
precision modeling
