三维椭圆振动辅助切削装置设计与优化研究

发布时间：2018-11-27 20:26

【摘要】：三维椭圆振动辅助切削(EVAC)是一种具有广阔应用前景的加工方法,三维EVAC能否在实际加工中表现出最佳性能,取决于三维EVAC装置的性能。目前已研制的三维EVAC装置存在产生椭圆轨迹形式单一、椭圆轨迹范围可调性差等问题,为此,本文对多种椭圆振动轨迹并存的三维EVAC装置进行了研究,从装置布局和尺寸优化方面探索了所设计装置的性能优化方法。首先采用三个相互垂直且结构形式相同的子链和柔性铰链放大结构的形式进行三维EVAC装置的设计,输出轨迹可调的三维椭圆振动,分析了产生三维椭圆振动轨迹;其次运用有限元方法对设计的装置进行了静力校核和动力瞬态分析,验证了刀尖轨迹多种输出方式;最后根据有限元分析的结果,从布局和尺寸方面建立三维EVAC装置的柔性铰链优化模型,对设计装置的尺寸参数和结构布局参数进行了分析和优化,得到装置最优参数。
[Abstract]:Three-dimensional elliptical vibration assisted cutting (EVAC) is a kind of machining method with wide application prospect. Whether 3D EVAC can show the best performance in practical machining depends on the performance of 3D EVAC device. At present, the developed 3D EVAC device has some problems, such as the single elliptical trajectory form, the poor adjustable elliptical trajectory range and so on. In this paper, a 3D EVAC device with multiple elliptical vibration trajectories is studied. The performance optimization method of the designed device is explored from the aspects of layout and dimension optimization. At first, three kinds of vertical sub-chain and flexure hinge amplification structure are adopted to design the three-dimensional EVAC device. The output trajectory is adjustable, and the three-dimensional elliptical vibration trajectory is analyzed. Secondly, the static checking and dynamic transient analysis of the designed device are carried out by using finite element method, which verifies the various output modes of the tool tip trajectory. Finally, according to the results of finite element analysis, the flexure hinge optimization model of 3D EVAC device is established from the aspect of layout and dimension. The dimension parameters and structural layout parameters of the design device are analyzed and optimized, and the optimum parameters of the device are obtained.
【作者单位】：南京航空航天大学机电学院;
【基金】：国家自然科学基金项目(51675277) 中央高校基本科研业务费专项资金项目(NS2016048) 研究生创新基地(实验室)开放基金项目(kfjj20150518)资助
【分类号】：TH122

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