| In this paper,the dynamic characteristics of rolling roller adjustment mechanism in high precision blade roller mill of aerospace engine are studied.The axial adjustment mechanism of the rolling roll is a reformed mechanism,and the dynamic simulation is carried out to verify whether the mechanism can meet the dynamic characteristics required by the adjustment.Based on this,this paper mainly discusses the dynamic characteristics of the lead-inclined plate adjustment system,and obtains the natural frequency of the adjustment system,and finally achieves the purpose of avoiding its resonance frequency,so that the roll can achieve high precision in axial adjustment,rolling out high-precision blades,and improving the mechanical properties and service life of the blades.In order to study the dynamic characteristics of the lead-inclined plate adjustment system,the mathematical modeling of the front and rear bearings,the lead screw,the inclined plate and the contact part between the lead screw and the inclined plate in the adjustment system was firstly carried out by the spring-damping model.The lead screw of the adjustment system is processed into a model of iron and wood hinged beam with lumped mass block.Considering the six degrees of freedom in the transverse,longitudinal and torsional directions of the lead screw in the working process,the calculation equations of kinetic energy,potential energy,virtual work by external load and energy dissipation function of the adjusting mechanism are listed,and the kinematics equation of the lead screw-inclined plate drive system is derived by using Lagrangian method.The microscopic expression of the free vibration of the lead screw was established by analyzing the transverse,longitudinal and torsional forces of the lead screw.On the premise of bearing stiffness,the frequency equation and mode function of the screw are solved by setting boundary conditions.By establishing the frequency equation and vibration mode function of the lead screw,the influences of bearing bearing stiffness,preload of the lead screw installation,rated speed of the lead screw,end face diameter of the lead screw and other factors on the vibration frequency and vibration mode function of the lead screw are analyzed respectively.The influence of the system parameters of the lead screw on the resonance speed of the lead screw at start is analyzed.Based on the consideration of avoiding the resonance phenomenon of lead screw,the system parameters of lead screw are selected reasonably.In view of the lead screw and take the initiative to the quality of the inclined plate for screw-inclined plate drive system has universal significance,and the influence of the quality of the inclined plate and screw in active ratio and the lead screw and the ratio of the length of the twodimensionless parameter plane,through the study of the numerical analysis of system,to determine the stability of the system and unsteady boundary,systematically analyzes the system parameters on the screw-inclined plate adjustment system stability influence factors.Excessive lead screw speed reduces the stability of the system.When the diameter of lead screw is small,the system has high stability.Increasing the contact stiffness between the active inclined plate and the lead screw will effectively increase the stability of the system.The paper has 66 figures,2 tables,58 references. |
