Research On The Static And Dynamic Characteristics Of Multi-axes Blades Grinding Machine Tool

Nowadays, turbine blades grinding machine tools have become the key equipment of turbine blades' fininishing. Comparing with the common NC machine tools, multi-degrees of freedom in movement and higher performances are needed. In order to meet the accuracy demands of the blades' grinding, the machine tool must have good static and dynamic characteristics. So it's important to employ static and dynamic structure analysis and optimize the structure of the machine tool.This dissertation is based on the project named "Research on the grinding technology of turbine blades", which is sponsored by the creative fund of AVIC I. The structure of the machine tool was designed at first. Then the static and dynamic characteristic analysis of the base frame and the vertical column of the machine tool were carried out. In addition, the non-linear FEM contact analysis is applied to the engaging distortion analysis of a timing belt via ANSYS.The optimal style and primary parameters of the machine tool structure were determined after investigations on most foreign grinding machine tools had been carried out. Then the degrees of freedom in movement, kinematics links, workspace, velocity, acceleration and many other parameters about the machine tool were designed.The 3D models of the base frame and the vertical column of the machine tool were constructed with Unigraphics. An FEM model was established in ANSYS utilizing the interface between UG and ANSYS. Then the static property of the base frame and the vertical column were simulated with ANSYS. The figures of nodes stress and the deformation were obtained.Modal analyses of the base frame and the vertical column were carried out to investigate their dynamic characters. And the several lowest natural frequencies were calculated. In order to improve anti-vibration character of the structure, the improved design was undertaken to make it have a higher first natural frequency and a better dynamic character was acquired. According to the results of the harmonic analysis of the vertical column, the variation was figured out by calculating the responses underseveral different frequencies. Then the response of the peak value was determined and the corresponding deformation and stress at the peak frequency were obtained.In order to validate the precision of timing belt's transmission, non-linear FEM contact analysis was applied to the engaging distortion analysis of a timing belt via ANSYS. The distortion of the timing belt, the stress distribution of the belt teeth and the maximal stress forced under the known torque were calculated. The law of the deformation of the timing belt and translation angle error alone with different loads was also obtained.