The Research On The Flow-induced Vibration Of Pipelines In Oil Drain System Of The20MN Quick Forging Press

Pipe vibration is a common problem in the hydraulic system. Pipe vibration will affect the safety and life of the pipeline, and cause the pipeline damage, rupture.In this paper.In this paper, the AMESim model of the20MN fast forging press drain system was built and analyzed in order to study the overflow pipes, drain pipes, unloading pipes and surge tank. The flow and pressure curves of the pipes was obtained from the AMESim simulation. According to the curves, based on the geometry of the pipes, the mutual influences of the flow and pressure in overflow pipes, drain pipes, unloading pipes and surge tank was analysed.ANSYS software was applied to analyze transient dynamics of the overflow pipes in order to analyse and calculate the stress and strain on the pipeline under pressure shocks, obtain the variation trend of the stress-strain stress of the pipeline structure with pressure changes in the pipe and pipeline construction trends strain cloud. Through the analysis of simulation results on drain piping systems and pipe structure, propose three measures to improve the pipeline of vibration:increasing the diameter of pipes to reduce the flow rate in pipelines, minimizing the flow impact in pipes; Changing pipe connections that separate unloading oil return pipe, avoid that the drain pipes and overflow pipes is affected of shocks in unloading pipe; installing the energy dissipating shock absorbers in unloading pipes, reducing the flow impact to reduce shock and vibration in unloading pipe. The research and analysis of this thesis should have some reference value and guiding significance to the design and installation, of the hadraulic system and pipelines of the fast forging press.The main content of this thesis:In chapter1, the object and significance of this thesis is presented. The current progress and problems on pipeline vibration have been reviewed. The development trend of fast forging presses forging machines is briefly introducted. Lastly, the main research subjects are resented.In chapter2, the characteristics, operating characteristics and process of20MN fast forging hydraulic systems was analysed so that to determine the initial possibility cause of piping vibrationof the quick forging machine drain systems.In chapter3, according to tructure and the working principle of the components in the20MN quick forging machine hydraulic system, the AMESim model of each component was applied to simulate the response characteristics,which estimate if its parameter settings of the valve meets the standard of the experimental test; the AMESim model of the return cylinder drain system in quick forging machine was simulated to obtain the flow and pressure curves of the drain pipe, overflow pipe and unloading pipeline and analyse the causes of flow and pressure distribution.In hapter4, ANSYS software was applied to analyze transient dynamics of the overflow pipes in order to analyse and calculate the stress and strain on the pipeline under pressure shocks, obtain the variation trend of the stress-strain stress of the pipeline structure with pressure changes in the pipe as well as the case of the pipeline occurred at a greater stress and strain; proposed three measures to improve the pipeline of vibrationAt the end, some conclusions in this thesis are summarized and future research proposals are suggested.