滚珠丝杠副刚性和综合性能研究与测评

发布时间：2018-05-08 18:36

本文选题：滚珠丝杠副 + 赫兹理论　；参考：《南京理工大学》2017年硕士论文

【摘要】：滚珠丝杠副广泛应用于数控机床进给系统。滚珠丝杠副的刚性、定位精度、温升、噪声及加速度是反映其优劣的重要性能指标。目前,国内滚珠丝杠副刚性和综合性能理论研究不足以及测评标准还不够完善,严重制约了国产丝杠副的自主研发。因此,针对滚珠丝杠副的刚性与综合性能进行研究与测评具有重要的意义。本文以双螺母垫片预紧滚珠丝杠副为研究对象,以赫兹理论为基础,对两螺母中的滚珠进行受力分析,并考虑滚珠丝杠副在受轴向载荷的情况下,接触角发生变化的情况,建立双螺母预紧滚珠丝杠副轴向静刚度数学模型。基于建立的轴向静刚度数学模型,讨论了丝杠有效行程内摩擦力矩的波动、丝杠旋转与扭转对轴向静刚度测量的影响,建立关系模型,并通过试验验证模型的正确性。理论上分析预紧力、滚珠圈数、适应度对轴向静刚度的影响,并通过试验验证了轴向静刚度模型的正确性。基于滚珠丝杠副轴向静刚度理论与试验研究,制定滚珠丝杠副轴向静刚度测评方案。该方案包括样件的选取、适应度的测量、轴向变形测量、扭转与旋转变形的补偿、轴向载荷的施加与测量、测量数据的处理以及轴向静刚度的评价。介绍了滚珠丝杠副加速度、定位精度、温升与噪声的测量原理,对定位精度、温升和噪声测量方案进行优化,最后进行实验并给出评价结果。
[Abstract]:Ball screw pair is widely used in CNC machine feed system. The rigidity, positioning accuracy, temperature rise, noise and acceleration of ball screw are important performance indexes. At present, the domestic ball screw pair rigidity and comprehensive performance theory research and evaluation standards are not perfect, which seriously restricts the independent research and development of domestic screw pairs. Therefore, it is of great significance to study and evaluate the rigidity and comprehensive performance of ball screw pairs. In this paper, the double nut gasket pre-tightening ball screw pair is taken as the research object. Based on Hertz's theory, the force of the ball in the two nuts is analyzed, and the contact angle of the ball screw pair is considered when the ball screw pair is subjected to axial load. A mathematical model of axial static stiffness of double nut pre-tightening ball screw is established. Based on the established mathematical model of axial static stiffness, the fluctuation of friction moment in the effective stroke of the lead screw, the influence of screw rotation and torsion on the measurement of axial static stiffness is discussed, and the relationship model is established, and the correctness of the model is verified by experiments. The effects of pretightening force ball number and fitness on axial static stiffness are analyzed theoretically and the correctness of axial static stiffness model is verified by experiments. Based on the theoretical and experimental study of axial static stiffness of ball screw, the evaluation scheme of axial static stiffness of ball screw is established. This scheme includes sample selection, fitness measurement, axial deformation measurement, torsion and rotation deformation compensation, axial load application and measurement, data processing and axial stiffness evaluation. This paper introduces the measurement principle of ball screw pair acceleration, positioning accuracy, temperature rise and noise, and optimizes the measurement scheme of positioning accuracy, temperature rise and noise. Finally, the experiment is carried out and the evaluation results are given.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG659

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