Study Of The Effect Of Working Conditions On Tribology Behavior Of Piston Pump Cylinder Material

As the core device of the hydraulic system,the axial piston pump is widely used in petroleum exploration,submarine and other fields due to its unique structure and high temperature resistance.However,the current machine is facing severe working conditions such as high temperature,high speed and heavy load.The service life of the piston pump has become a key factor in the development of high-end equipment.The long-term optimization and improvement of the lubrication characteristics of the friction pair of the piston pump is an effective way to extend the service life of the pump body.Therefore,enhancing the wear resistance and seizure resistance of the piston cylinder material is the key to life extension and efficiency.In this paper,under the premise of retaining the basic characteristics of the mechanics and kinematics of the swash plate axial piston pump,a simplified modeling is carried out to obtain the "Ring-Block" friction model of the piston pair.The dual ring selects GCr15 bearing steel ri ng,and the dual block selects Cu Sn10,Cu Sn10Pb10,Cu Sn10Bi3,Cu Sn Pb24,Cu Pb30 five copper-based composite materials prepared by powder metallurgy technology,and tribological performance test of materials the copper-based composite is completed on the MRH-3 high-speed ring-block wear tester.By analyzing the lubrication state,surface morphology and piston inclination of the friction pair when the piston is working,the influence of the lubrication condition and surface roughness of the piston pair on the tribological properties of the material is obtained.The influence of the tribological properties of the copper matrix composites,and then the influence of the surface roughness of the couple rings on the wear process of Cu Sn10Bi3 was evaluated.The frict ion surface is characterized by scanning electron microscope(SEM)and three-dimensional profile,and the distribution of elements on the friction surface is quantitatively analyzed by energy spectrometer(EDS)and electron probe(EPMA),and the lubricatin g oil is analyzed by laser dynamic scattering instrument.The liquid is analyzed for particle size.The results show that Cu Sn10Bi3 has better mechanical properties,tribological properties and seizure resistance than traditional tin bronze and high-lead bronze.The friction coefficient,volume wear and wear rate of Cu Sn10Bi3 increase sharply with the increase of the mating ring roughness.Trend,that is,the greater the roughness of the dual ring,the faster the upward trend of the friction characteristic curve,and the shorter the time required to enter the stable wear stage and the severe wear stage.On the basis of the above research,with the aid of ABAQUS finite element simulation software,three sizes of asperity collision models were established,foc using on the stress distribution of the friction contact interface,and it was learned that the roughnesses Ra0.01,Ra0.1 and Ra0.8 correspond s to three types.The influence law of the size of asperity 2 on the friction and collision of asperity 1.In summary,under different lubrication conditions and surface roughness,the Cu Sn10Bi3 cylinder block material with better tribological properties was determined,which further improved the tribological properties cylinder block material of the piston pump piston,and quantitatively studied Cu Sn10Bi3 Wear mechanism under different roughness.The size of the abrasive particles produced at different stages of the wear process is related to the simulation results.The simulation method can predict the wear condition of the bismuth bronze cylinder under different surface roughness during the operation of the piston pump to a certain extent.Development provides theoretical foundation and engineering guidance.