Numerical Simulation And Experimental Research Of 20Cr Gear Strengthened By Water-jet Cavitation Peening

With the progress and development of modern industry,high-end equipment requires higher and higher mechanical properties of parts and components.But in engineering practice,many parts will produce fatigue cracks due to the impact of alternating loads,which will eventually lead to the failure of parts.Water-jet cavitation peening technology utilizes the lots of clusters of the cavitation bubbles caused by the submerge cavitation jet.These cavitation bubbles clusters could produce shock wave which can strengthen the surface of the component.But at present,the research on Water-jet cavitation peening started late in China.The research on the formation mechanism of residual stress field in Water-jet cavitation peening is relatively weak,which hinders the further development and improvement of this technology to a great extent.Firstly,the current popular shot peening strengthening methods are described.The paper introduces the tradition mechanical shot peening and some new shot peening methods,and then,introduces the production conditions,determination method and residual compressive stress generation mechanism.In order to study the stress distribution of 20 Cr gear under different loading time and different peak load conditions,the whole loading mode was used to simulate the gear.The process of 20 Cr gear strengthened by shot peening with cavitating water was numerically simulated.The propagation process of shock wave in gear and the distribution of residual compressive stress of 20 Cr gear under different loading time and peak load conditions were obtained.By comparing and analyzing the simulation results and experimental data of 20 Cr gear strengthened by shot peening with cavitating water,it shows that the numerical simulation method used in this paper can provide certain theoretical support for the design of process parameters of Water-jet cavitation peening.