侧铣加工自由曲面刀具路径轨迹规划关键技术研究

项目名称： 侧铣加工自由曲面刀具路径轨迹规划关键技术研究

项目编号： No.51305379

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 赵世田

作者单位： 盐城工学院

项目金额： 24万元

中文摘要： 自由曲面中的直纹面以其几何特性适用于侧铣加工，相对于球头刀点接触加工方式可以极大提高加工效率，但是侧铣加工的应用受限于干涉调整困难等关键技术。本项目采用运动学理论、自由曲面建模理论，分析加工误差模型的建立和刀具姿态的整体优化方法，借助微分几何建立评价加工误差函数模型的方法，探讨刀具路径轨迹的刀轴矢量整体平滑方法和调整方案，研究侧铣加工刀具路径轨迹双NURBS样条曲线插补直接输出模式，分析侧铣加工非线性误差模型。本项目的难点和关键问题在于，衡量设计曲面与刀具包络面的加工误差模型的建立和基于实际机床运动结构的非线性误差模型的建立。本项目的实施将为五轴联动侧铣加工直纹面类航空关键零件提供理论基础。

中文关键词： 侧铣加工；自由曲面；加工误差；干涉；双NURBS样条曲线插补

英文摘要： Flank milling is suitable for freeform surface machining, especially for ruled surface machining for its geometric characteristics. Although the machining efficiency can be improved greatly by flank milling method relative to the ball milling method, application of flank milling method is restricted to the difficulties, such as the adjustment of collision avoidance. In this research, Kinematics theory and freeform surface modeling theory are used. Methods of machining error model construction and global optimization of tool axis are analyzed. Differential geometry is used to construct the method to weight the machine errors model. Adjustment and global smooth of tool axis of tool-path planning are investigated. Model of double NURBS curve interpolation to be output directly for flank milling is studied and non-linear errors model of flank milling is studied also. Key technology and difficulty of the research are the construction of non-linear error model based on the real structure of machining center and the construction of the machining error model to weight the design freeform surface and the swept envelop surface of machine tool. Application of the research can provide the basis theory of ruled surface machining using flank milling method.

英文关键词： Flank milling；Free-form nsurface；Machining error；Interference；Double NURBS curve interpolation