Parameter Identification and Dynamic Analysis of Machine Tool Guide-way Joint Surface

Abstract

The joint surface of machine tools has an important impact on the dynamic characteristics of the whole machine, and the identification of the dynamic characteristics parameters of the joint surface has great significance to improve the whole performance and shorten the development cycle. According to the characteristics of concentrated parameters in the connection process of machine tool structural components, a test and identification method based on discrete component analysis theory is proposed to realize the stiffness and damping parameters of the joint surface of the whole machine tool. In this paper, the parameters of two rolling joint surfaces and one sliding joint surface of the machine tool are tested and analyzed for a machining center. This paper uses the pulse test method to identify the parameters of the joint surface of the three guide-way in a certain type of slant bed CNC machine tool. The method proposed in this paper for testing the parameters of the machine tool joint surface is different from the traditional method for identifying the parameters of the joint surface in the separate paired test of components. Using the whole machine field test, it can reflect the real time values of the parameters of the joint surface in the use of the machine tool. In the experiment, the joint surface was excited in the vertical direction, and the transfer function of the guide-way joint surface was obtained from it, so as to identify the stiffness parameters and damping of the guide-way. By dividing the mesh in the finite element software Hyper Mesh and combining with the finite element software ANSYS to perform the equivalent of the machine tool guide-way joint surface, and the stiffness and damping parameters tested in the joint surface are given for modal analysis. Comparing the modal analysis results that define the joint surface parameters or not, it is important to verify that the simulation of the joint surface part of the guide-way is of great significance in the modeling.