Structural Optimization Design Of The Main Spindle Box In SKR-4DQ Coiling Machine

SKR-4DQ coiling machine is a new developed product, yet noises are quite large during the running process, and vibrations are strong which result in low qualitative outputs. In this work, the software Cosmosworks was employed to do the modal analysis of the vibration of the main spindle box, which serves as the major component of a coiling machine. Base on the results of the modal analysis, structural optimization was carried out to increase the fundamental vibration frequency.A three dimensional computational model was built up using the software Solidworks, then Cosmosworks which embedded in Solidworks was employed to investigate the effect of the mesh resolution on the modal analysis results, and to calculate the resonant vibration modes. Base on these results, structural optimizations concerning a single caliber or all calibers were studied, and some useful conclusions are obtained.The first ten order resonant modes and their corresponding vibration frequencies were obtained, which gives information on the components with weak rigidity in the main spindle box. The sensitivity of each caliber on the fundamental vibration frequency was studied, and the best calibers to have the highest fundamental vibration frequency were found out in the structural optimization with all calibers taking into account. With the optimized calibers, the fundamental vibration frequency was increased from 788.02 Hz to 1224.8 Hz, corresponding to a 55.4% increment, yet mass of the main spindle box is only 21.1% heavier than that of the original model. The coiling machine with the optimized calibers has the potential to increase the running velocity, and to increase the efficient. The software ANASYS which based on the finite element method was dopted to analysis the harmonic response of the original spindle box and the improved one, results showed that the optimazing process is good enough to fulfill the optimazition target.Conclusions about the mesh resolution, the sensitivities of the major caliber on the fundamental vibration frequency and their corresponding trends are valuable, and these results are important in future designing activities.