Vibration Analysis And Optimization Of Gear Transmission System Of Crank Press

With the rapid development of the manufacturing industry and the improvement of production efficiency,the manufacturing industry has increasingly higher requirements for manufacturing equipment.Compared with other production methods,forging manufacture has the advantages of high production efficiency,good product quality and low processing cost.In industrial production,more and more forging processes are used to replace traditional cutting processes and other processing processes.As an important processing equipment for forging and manufacturing,crank presses are playing an increasingly important role in machinery manufacturing and related industries.People have put forward higher requirements on the working performance of crank presses.Therefore,studying the cause of the transmission gear meshing vibration plays a very important role in improving the working performance of the crank press.This paper takes Shandong Machinery Co.,Ltd.JM21-160 crankshaft press gear transmission system as the research object.Factors such as the deviation of the bearing housing hole of the crankshaft press gearbox in actual production,the manufacturing error of the transmission gear and the deformation of the gear teeth under load are analyzed,and an optimized solution is proposed.The main work of this paper is as follows:Firstly,the mechanism and working principle of the crank press transmission system are analyzed.The transmission ratio,meshing frequency and meshing force between teeth of the gear transmission system are calculated.According to the Hertz theory and Hu Ke’s law,the calculation of the stress of the gear teeth of the crank press transmission gear under rated conditions is analyzed.Using the parameter design method,a three-dimensional model of the JM21-160 crank press is established and assembled without interference,which provided a geometric basis for subsequent analysis.Secondly,the reason for the deviation of the bearing housing of the crank press gear box in the three aspects of manufacturing,position measurement and load deformation is studied.And calculated the deviation of the bearing seat hole.The meshing stiffness of the gear is calculated to provide a data basis for the subsequent simulation.ADAMS is used to establish the multi-body dynamic model of the gear transmission system,and the gear meshing vibration caused by the deviation of the housing bore is explored.Next,the errors of gears during processing and manufacturing and the deformation of gear teeth under load are analyzed.From the perspective of reducing gear meshing impact and improving transmission stability,the gear modification program is introduced.And calculated the best amount of modification.Through simulation experiments,the motion characteristics of gearbox gears before and after modification are discussed,which provides a reference for improving the performance of gearbox gears.Finally,the JM21-160 crank press is carried out three sets of experiments:bearing bore deviation test of crank press transmission system,comparison test before and after gear modification,and vibration test experiment of modified gear under bearing seat bore deviation.By comparing the experimental results of the three groups of experiments with the results of the simulation analysis in this paper,the rationality of the simulation analysis and the effectiveness of the proposed scheme are verified.