Research On Rotary Cross Structure Vibration Isolator

Rotary cross structure is an innovative mechanical structure form. It can be used as elastic component and support structure in devices, and has a good prospect of practical application. In this paper, based on the vibration theory and rotary cross structure, a dry friction damping vibration isolator had been designed. Static and dynamic characteristics of rotary cross structure was analyzed with finite element simulation technique. Casting process and parameter optimization also had been studied in this paper. The research in this paper will be a useful point of reference for the rotary cross structure practical application.According to the characteristics of rotary cross structure, a dry friction vibration isolator consists of damping plates and rotary cross structure was designed. The geometric and mechanical analysis showed that the vibration isolator was a variable stiffness vibration isolator. The results of analysis by ANSYS indicated that stiffness of rotary cross structure increased with the increase of the thickness. Load stepping analysis verified that stiffness of the vibration isolator decreased with the increased of loads. Based on ANSYS sine load transient dynamics analysis, the phenomenon of hysteresis was found and hysteretic curve was drawn. Results showed that the rotary cross vibration isolator performed well in energy dissipation and damping effect.Besides, the forming method and process of rotary cross structure was studied. According to the rotary cross structural characteristics and its bearing characteristics, investment casting process was chosen. And step gating system and top gating system were designed for investment casting. By using PROCAST numerical simulation technology, a comparison of two kinds of gating systems were given. The simulation results showed that top gating system could achieve better quality of casting. So, top gating system was selected, and then improvements steps for top gating system were taken.Finally, the investment casting technology for rotary cross structure was optimized by orthogonal experiment. The effects of pouring temperature, casting time and shell temperature on the quality of casting are studied. Results showed that the factors affecting cast shrinkage cavity and porosity defects in a descending order as:mold temperature, pouring time, pouring temperature. Casting porosity volume was minimum, when pouring temperature of 1610℃,mold temperature of 500℃, pouring time of 5s.