双驱滚滑复合导轨直线进给系统动态特性分析

发布时间：2018-04-08 18:15

本文选题：双驱动　切入点：滚滑复合导轨　出处：《南京理工大学》2015年硕士论文

【摘要】：随着高档数控机床的发展,应对高速重载工作条件的能力越来越受到重视。传统的滚动导轨和滑动导轨由于自身特性,不能独立应对这样的工作条件。同样,双丝杠驱动具有刚度高和响应速度快等优点,相较于单丝杠驱动可以更好的满足高速重载数控机床进给系统的要求。因此,本文针对一种新型双驱滚滑复合导轨进给系统及其动态特性的研究具有十分重要的意义。本文基于双驱滚滑复合导轨进给系统的功能要求,对于滚滑复合导轨结构进行设计,同时对进给系统工作台等零件进行了静力学分析和拓扑优化,最终研制了新型进给系统试验台。建立模态试验系统,对进给系统进行模态试验,采集到试验台各阶振型和频率。提出了一种基于环形虚拟材料层的圆柱结合部动态特性建模方法。并将应用了新型建模方法的有限元仿真结果与模态试验结果对比,误差绝对值平均值只有6.7%,验证了新型建模方法的准确性。基于单自由度振动理论,建立了消除基础部件位移影响的进给系统结合部动态特性参数测试系统和识别方法。通过变量控制试验,得到了不同工况下进给系统结合部动态特性参数。分析了参数在不同工况下变化的规律和原因。
[Abstract]:With the development of high-grade NC machine tools, more and more attention has been paid to the ability to deal with high-speed and heavy-load working conditions.Because of their own characteristics, the traditional rolling guide and sliding guide can not independently deal with such working conditions.In the same way, double screw drive has the advantages of high stiffness and fast response. Compared with single lead screw drive, it can better meet the requirements of high speed and heavy load CNC machine feed system.Therefore, it is of great significance to study the feed system and its dynamic characteristics of a new type of double drive rolling slide composite guideway.In this paper, based on the functional requirements of the double drive rolling slide composite guideway feed system, the structure of the rolling slide composite guide rail is designed, and the statics analysis and topology optimization of the feed system worktable and other parts are carried out.Finally, a new feed system test-bed is developed.The modal test system was set up, and the mode test of the feed system was carried out, and the vibration modes and frequencies of each order of the test bed were collected.A method for modeling the dynamic characteristics of cylindrical joints based on annular virtual material layer is presented.The finite element simulation results using the new modeling method are compared with the modal test results, and the average absolute error is only 6.7, which verifies the accuracy of the new modeling method.Based on the vibration theory of single degree of freedom, a testing system and identification method for dynamic characteristic parameters of feed system joint are established to eliminate the influence of displacement of foundation parts.Through variable control test, the dynamic characteristic parameters of feed system are obtained under different working conditions.The law and reason of the change of parameters under different working conditions are analyzed.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG659

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