Experimental Study On Friction And Wear Properties Of Copper Alloy Materials For Diesel Engine Sliding Bearings

The sliding bearing of the diesel engine is connected to the piston pin and the small end of the connecting rod.It works in the harsh environment of high specific pressure,high temperature,high speed and lean oil lubrication.The friction and wear performance of the sliding bearing is critical to the reliability and life of the diesel engine.Therefore,the research on the friction and wear performance of the sliding bearing has always been one of the difficult problems in the development of diesel engine.In this paper,the sliding bearing copper alloy material and the piston pin are used as the friction pair.The pin-disk friction and wear test is designed.Combining the scanning electron microscope and the energy spectrum analysis method,the friction and wear performance of the sliding bearing copper alloy material under different loads and speeds is studied.The wear mechanism and transformation of bearing copper alloy materials under test conditions provide a theoretical basis for the development of sliding bearings.The main work and research results are as follows:1.Three kinds of sliding bearing copper alloy materials QSn7-0.2,CuZn31Si1,CuNi9Sn6 were selected as the test pins,and 12CrNi3 A was used as the ring.The pin-disk friction and wear test was conducted to compare and analyze the friction an d wear properties of the three sliding bearing copper alloy materials under different loads and speed Law of influence.The results show that: friction coefficient: CuNi9Sn6<CuZn31Si1<QSn7-0.2;wear amount: CuNi9Sn6<CuZn31Si1<QSn7-0.2.CuNi9Sn6 has the best friction and wear performance.2.The scanning electron microscope and energy spectrometer were used to observe and measure the microscopic morphology and element content of the wear surfaces of the three sliding bearing copper alloy test pieces,and analyze the wear mechanism and transformation.The test results show that as the load increases,the main wear type of QSn7-0.2 changes from abrasive wear to adhesive wear;the main wear type of CuZn31Si1 changes from abrasive wear and plastic deformation wear to abrasive wear and adhesive wear;CuNi9Sn6 The main type of wear is changed from abrasive wear to fatigue wear.As the speed increases,the main wear type of QSn7-0.2 changes from abrasive wear to plastic deformation wear and adhesive wear;the main wear type of CuZn31Si1 changes from abrasive wear to slight adhesive wear and slight plastic deformation wear;the main wear type of CuNi9Sn6 changes from abrasive wear to plastic deformation wear.