Finite Element Analysis Of CK61125 CNC Lathe Spindle Box

Before CK61125 CNC lathes was put into processing, in order to verify whether in the actual production it can meet the requirements of strength and stiffness, and have a good dynamic performance, and meet the processing precision in the actual processing, so it is necessary to make theoretical or experimental analysis. CNC lathe spindle box is a key component of the CNC lathe, and its own mechanical properties are the main factor affecting the machining accuracy and life of machine tools. So the systematic finite element analysis was made for CK61125 Spindle Box in ANSYS Workbench.Fully considered CK61125 spindle box actual geometry, boundary conditions and load conditions, etc, the headstock solid model was build by simplifying its structure in Pro/ENGINEER, and the calculation of the finite element analysis was largely simplified. Spindle box grids were obtained using the method of FEM convergence, and the accuracy of finite element analysis results was greatly increased. Through the static analysis for the spindle box, the stress and strain of the spindle box were calculated. Finally, it is verified that the spindle box meet the requirements of static stiffness and strength. The spindle box has a high ability to resist damage and deformation, and it has better stiffness and strength, but the design is too conservative. Through the finite element modal analysis for spindle box, the first 12 natural frequencies and mode shapes were obtained, and it can avoid resonance with other objects. The possible weak links in the headstock were found, and it provide theoretical basis for the rational design of the spindle box, and laid the foundation for the subsequent harmonic analysis. Through the harmonic response analysis for spindle box, the response in the exciting force frequency and vibration frequency curve for spindle box were gained. The above analysis, the spindle box meet their performance requirements, and the main weak link in the headstock was identified which is located the support ribs in the middle of spindle box, and structural reform in this area can improve the performance of the spindle box, thus the CNC lathes processing accuracy and life were improved. In order to improve the performance of the spindle box, the structural transformation of the spindle box was done in the help of adding the stiffener of the support rib in the middle of the spindle box. To verify the feasibility of the approach, the systematic finite element analysis was made after the transformation of headstock, and compared with the former. By comparing, the static stiffness and strength of the headstock has been improved after transformation, and the response displacement of stress in the excitation force decreased. After the transformation, the spindle box had not major structural changes, but its dynamic performance was improved, so the reconstruction scheme is a cost-effective and feasible.