结合部法向载荷解析解修正与定量实验验证

Modification of Normal Load's Analytic Solutions for Joint Interface and Quantitative Experimental Verification

给出了识别结合部的2个重要表征参数(分形维数和分形粗糙度)的方法,修正了结合部法向总载荷公式。以XHK5140型自动换刀计算机数控立式镗铣床上的结合部为研究对象,以测试试件的实验结果为基准,按照振型相似定性比较、固有频率定量比较的原则,对结合部法向与切向接触刚度的理论解进行了验证。理论模型的振型与实验的振型皆一致,理论与实验固有频率的相对误差在-9%～9%之间。

A method to identify such two important characteristic parameters of joint interfaces as fractal dimension and fractal roughness was given. The expression of normal total load in joint interface was modified. A joint interface was selected as an example in XHKS140 automatic tool-changing CNC vertical boring and milling machine tool on the basis of the experimental results about test specimen, the theoretical solutions for normal and tangential contact stiffness were verified in terms of qualitative comparison principle of resembling mode shape and quantitative comparison principle of natural frequencies. The theoretical mode shapes between the theoretical natural frequencies agreed well with the experimental results. The relative errors and the experimental ones are between -9% and 9%.