CAJ | 학술논문

滚珠丝杠进给系统的动态特性对数控机床的定位精度、加工性能和振动等特性具有重要影响.针对滚珠丝杠进给系统理论建模中结合部刚度难以确定的问题,以自行设计制造的滚珠丝杠进给系统为研究对象,基于吉村允效法计算进给系统固定结合部的刚度;根据滚珠丝杠副、滚动导轨副和轴承结合部的共同特点,提出基于Hertz接触理论的进给系统滚动结合部刚度计算方法,建立进给系统的有限元模型.在此基础之上,对进给系统进行理论和试验模态分析,通过模态振型和固有频率的对比验证了有限元模型和滚动结合部刚度计算方法的正确性.根据所建立的有限元模型,着重分析工作台的质量和位置、滚珠丝杠副的刚度、滚动导轨副的刚度和轴承的刚度等参数对进给系统动态特性的影响.所提出的方法为机床滚动结合部刚度的识别提供了参考,研究结论为滚珠丝杠进给系统的改进设计和动态性能优化提供了依据.
곤주사강진급계통적동태특성대수공궤상적정위정도、가공성능화진동등특성구유중요영향.침대곤주사강진급계통이론건모중결합부강도난이학정적문제,이자행설계제조적곤주사강진급계통위연구대상,기우길촌윤효법계산진급계통고정결합부적강도;근거곤주사강부、곤동도궤부화축승결합부적공동특점,제출기우Hertz접촉이론적진급계통곤동결합부강도계산방법,건립진급계통적유한원모형.재차기출지상,대진급계통진행이론화시험모태분석,통과모태진형화고유빈솔적대비험증료유한원모형화곤동결합부강도계산방법적정학성.근거소건립적유한원모형,착중분석공작태적질량화위치、곤주사강부적강도、곤동도궤부적강도화축승적강도등삼수대진급계통동태특성적영향.소제출적방법위궤상곤동결합부강도적식별제공료삼고,연구결론위곤주사강진급계통적개진설계화동태성능우화제공료의거.
Dynamic characteristic of ball screw feed system is of significant influence on positioning precision, machining performance and vibration characteristic of machine tools. In illusion to the problem that stiffness of joints are difficult to determine in theoretical modeling of the ball screw feed system, with a self-designed and manufactured ball screw feed system as research object, fixed joints stiffness of the feed system is obtained by Takashi Yoshimura method; According to the common feature of ball screw assembly, rolling guide pair and rolling bearing, a stiffness calculating method of the rolling joints is proposed based on the Hertz contact theory, upon which a finite element (FE) model is established. On this basis, theoretical and experimental modal analysis are conducted, the validity of the FE model is verified by the comparisons of modal shapes and natural frequencies. According to the established FE model, effects of workbench's mass and location, ball screw assembly's stiffness, rolling guide pair's stiffness and bearing's stiffness on dynamic characteristic of the ball screw feed system are analyzed. The proposed method provides a reference for the stiffness identification of machine tool's rolling joints, and the research conclusions provide a foundation for optimal design of the ball screw feed system.