| Inertia vibration shakeout machine is widely used in the field of casting shakeout in the foundry industry because of its high efficiency and good quality.In the working process of the falling sand machine,its key components bear the effect of motor exciting force and casting load for a long time,which is easy to produce fatigue fracture.The mechanical characteristics and fatigue life of the components have an important impact on the comprehensive performance of the falling sand machine.Therefore,this paper probes into the mechanical properties of a certain type of sand falling machine and proposes a complete analysis and optimization scheme,which provides an idea for the optimization of domestic high reliability inertia vibration sand falling machine.The main research contents of this paper are as follows:Firstly,based on the structure,working principle and design data of this type of inertial vibration shakeout machine,the basic physical parameters and the stiffness of the spring assembly are calculated.According to the working state of the sand machine and Lagrange equation,a 3-degree-of-freedom mechanical model of vertical motion,rotation around y axis and z axis of the vibration frame is established for theoretical analysis.The natural frequency and mode of the system are obtained by using MATLAB.Secondly,based on the finite element model establishment method,the threedimensional model of the inertial vibration shakeout machine is simplified to a certain extent and the static analysis of its no-load,uniformly distributed load,and eccentric load in different areas of the upper grid plate is carried out.By analyzing the position shift and equivalent stress distribution of the inertia vibration shakeout machine under different working conditions,the influence of off-load position on the equivalent stress of the shakeout machine was analyzed.Determine the failure prone area of the falling sand machine under working condition and compare it with the actual use.Thirdly,the dynamic analysis of the inertia vibration shakeout machine is carried out,the vibration characteristics of the shakeout machine under different conditions are studied,and the influence law of prestress loading on its natural frequency is analyzed;The reliability of the theoretical model is verified by comparison.The dynamic simulation is carried out for different specifications of castings and the position of eccentric load,and the influence of the position and size of eccentric load on its transient response is further analyzed.Finally,combined with the transient dynamic analysis results of the inertia vibration shakeout machine under different working conditions and the specific parameters of each material in the relevant design data,the fatigue life of the machine under various working conditions is analyzed by using the fatigue analysis software ANSYS n Code Design Life,and the structure is improved according to the fatigue life results. |
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