数控加工过程柔性工件变形预测与误差补偿方法的研究  

Deformation Prediction of Flexible Workpieces and an Error Compensation Method in NC Machining Processing

作　　者：邓耀华[1,2] 刘桂雄[1] 吴黎明[2] 唐露新[2] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510643 [2]广东工业大学信息工程学院,广州510006

出　　处：《机械科学与技术》2010年第7期846-851,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：2008年粤港关键领域重点突破项目(20080102-5);广东省自然科学基金项目(05001838)资助

摘　　要：研究了数控加工过程中被加工的柔性工件变形预测和加工轨迹偏移的补偿方法。以绗缝数控加工中常用的织物面料为对象,分析了有限元技术在该类材料变形模拟方面的应用,在此基础上提出了使用样条有限元的方法对柔性织物变形量的计算方法。首先对单条纱线的变形进行三次样条插值分析,然后运用有限元的思想由线及面,将平面织物作为各向异性材料,利用双三次函数插值,建立简单的面模型,推导出平面织物受力变形位移的计算公式。最后提出了一种分象限的补偿的新方法,该方法以加工直线图元为对象,根据变形特征得到直线图元象限补偿落点的分布规律。测试结果表明:该方法能够提高加工补偿计算的速度和精度。Prediction of flexible material deformation and its compensation in NC processing is studied.We analyze the finite element method for deformation simulation and prediction of fabric and its application to quilting processing,and a method for calculating fabric deformation using spline finite element is put forward.First,fabric is regarded as anisotropic materials.We analyze the deformation of single yarn by cubic spline interpolation.Then,we apply finite element method from line to plane,utilize dual cubic spline interpolation to build a simple plane deformation model,and deduce the calculation formula for deformation displacement.Finally,we take the line graphic element for object;according to different quadrant we give the compensation method and obtain the distribution law of correction coordinate points in four quadrants.Result shows that the above method can improve the speed of compensation calculation,the precision of manufacture and the quilting effect.

关 键 词：数控加工 柔性工件 样条有限元 变形预测 误差补偿 

分 类 号：TH16[机械工程—机械制造及自动化]