Vibration Analysis And Structural Optimization For Swing Arm Of Chip Sorting Machine

The chip sorting machine is a key equipment in the semiconductor packaging and testing industry,and the sorting mechanism on the sorting machine is a key component,by which realizes the sorting of different photoelectric parameter chips.The swing arm acts as a part of the sorting mechanism that directly drives the nozzl e to pick up and place the chip,whose structural stiffness directly affects the sorting precision,and even scrapes off the chip that has been sorted.For the vibration of the swing arm of the chip sorting mechanism,it is necessary to carry out research on the vibration suppressio n of the swing arm of the chip sorting mechanism under the premise of ensuring the structural strength and stiffness.In this paper,the swing arm of a new chip sorting mechanism was taken as the research object,and the following research work was carried out:(1)Structural design and dynamics simulation of the swing arm.Firstly,according to the structural size requirements of the swing arm,an empirical design meth od was adopted to design the swing arm.Then,considering to the structural relationship between the different parts of the sorting mechanism,I established the multi-rigid dynamics model of the sorting mechanism by the ADAMS software,and applied the motion pair and drive to verify the correctness of the motion pair and the drive according to the actual working conditions;The rigid-flexible coupling dynamics model of the sorting mechanism was used to obtain the vibration displacement curve of the centroid of the nozzle,and the acceleration curve of the centroid of the swing arm was obtained to prepare for the following static and dynamic characteristics analysis.(2)Static and dynamic characteristics analysis.Firstly,the three-dimensional model of the swing arm was simplified,the finite element simulation model of the swing arm was established,the static analysis was performed,the force and deformation of the swing arm were obtained,and the strength and stiffness were investigated.Then the modal analysis was performed to calculate the front tenth-order mode of the swing arm.The tenth-order mode obtained the natural frequency of the swing arm,and was used to decide whether it was within the range of the excitation frequency,whether resonance may occur to determine its optimization space.Finally,the harmonic response analysis was carried out to investigate the steady-state vibration response of the swing arm.(3)Stiffness optimization of the swing arm.Based on the parametric model of the swing arm,the strength and stiffness of the swing arm were used for constraints.The lateral deformation of the swing arm and the first-order natural frequency were used for the objective functions to optimize the stiffness of the swing arm.According to the optimized structural parameters,the model of the swing arm was re-established,and the dynamics simulation analysis,static analysis,modal analysis an d harmonic response analysis were performed,and then compared with the improved results to verify the effectiveness of the optimization.In this paper,the swing arm of a new sorting mechanism was taken as the research object,and the work of structural design,dynamics simulation analysis,finite element analysis and structural stiffness optimization was carried out,which had certain guiding value for engineering application.