• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2014, Vol. 50 ›› Issue (9): 142-147.

• 论文 • 上一篇    下一篇

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基于逆向工程的自由曲面涂层加工系统设计

陈志鸿;房海蓉;方跃法   

  1. 北京交通大学机械与电子控制工程学院
  • 出版日期:2014-05-05 发布日期:2014-05-05

Design of the Free-form Coating Machining System in Reverse Engineering

CHEN Zhihong,;FNAG Hairong,;FANG Yuefa   

  1. School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University
  • Online:2014-05-05 Published:2014-05-05

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摘要： 提出针对金属曲面表面非金属涂层的逆向工程加工系统。由改造的840D数控系统作为采集轨迹控制系统和加工控制系统，对工件自由曲面自动采集形貌特征并储存。工控机通过以太网与数控系统交换数据并生成小线段数控加工程序。为提高加工效率，减小拐点加速度突变产生冲击，提出以NURBS样条程序代替小线段加工程序的程序后置处理方法。该方法与传统的NURBS样条拟合算法不同，直接以小线段的拐点作为样条的控制顶点构造曲线，避免繁琐的拟合运算，提高程序处理效率，在小线段拐角较大的衔接点通过修改样条形状的方法减小误差。在工件喷涂完涂层后，系统通过激光传感器实现自动对刀。最后通过加工试验证明该加工系统高效、稳定和实用。

关键词: 逆向工程;自由曲面;涂层加工;NURBS;对刀

Abstract: A new profile modeling machining system is presented, which processes the foam coating on the surface of aircraft to be uniform thickness. 840D CNC, a laser sensor which is installed on the spindle and industrial personal computer are employed to form the system. The feature of the free-form surface is sampled and modeled by CAM software to generate continuous micro-line NC program. NURBS is introduced to NC program post-processing to make the machining high-efficiency and smooth. The main idea of program post-processing algorithm is to construct NURBS curves base on letting inflection points be control points and modifying it by changing the control points, instead of fitting a NURBS curve based on letting measured points be data points, which is time-consuming. The laser is used for precise positioning work piece. Finally, experimental results verify the effectiveness of the processing methods.

Key words: reverse engineering;free-form surface;coating machining;NURBS;tool setting

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