Study On Surface Silicon Particle Shaping Technology Of High Silicon Aluminum Alloy Cylinder Liner

High silicon aluminum alloy liner has low density,high thermal conductivity and good compatibility.Besides,it shows same thermal physical properties with aluminum alloy piston.It is a cylinder liner material with good comprehensive performance.It needs higher content of silicon particles to improve the poor wear resistance of aluminum alloy and reduces the friction coefficient.The friction coefficient is larger with aluminum on the surface of silicon particle after machining the surface of the cylinder because the aluminum alloy matrix is tough and the silicon particle is fragileand.After the silicon particles expose,the sharp edge easily induced scuffing.Therefore,we need a shaping technology to effectively improve the tribology properties of the liner.The shaping technology not only can make the surface silicon particles protruding,but also be able to make the convex silicon particles corner rounding.However,the existing honing processing technology cannot achieve this purpose in the field of mechanical processing.This paper object in the high silicon aluminum alloy cylinder,to make the cylinder surface silicon protruding particles as the guide,design and manufacture the testing machine which can shaping surface silicon particle of high silicon aluminum alloy cylinder.This machine simulates the contact and movement behavior between whetstone and cylinder.As to the most important factor of product honing force,we construe it independently.Test show that,the machine not only can make the surface silicon particles protruding,but also be able to make the convex silicon particles corner rounding.These can solute the problem of stress concentration brings by projecting silicon particles corners sharp effectively.Then,make the cylinder sample processed by the machine under different time parameters as a comparison,and paired them with chromium based ceramic composite plated piston ring sample.Contrast they friction coefficient and wear rate after friction and wear test.Finely select a better processing time parameters.The main contents and conclusions of this paper are as follows:1.Design and manufacture the test machine of shaping surface silicon particle of the high silicon aluminum alloy cylinder liner.The verification test shows that the test machine can make the surface silicon particles protruding and edge angle effectively,and the stable of the machine is well.2.The test machine of shaping surface silicon particle of the high silicon aluminum alloy cylinder liner is used-to process the high silicon aluminum alloy cylinder surface.-In.the same conditions of reciprocating frequency,rotation speed,load,with the increase of processing time,the surface silicon particles protruding higher,and the corner round degree is also improved.3.Friction and wear test results show that,with the increase of processing time,Law of friction coefficient pair showed decreased first and then increased.In 2 min,the pair friction coefficient reaches the minimum value.Composition of the pairs of 0 min,the friction coefficient decreased 14 percent.Cylinder specimen of wear volume showed law of decreased first and increased then,in the treatment of 2 min and 3min,wear of cylinder has a minimum value.Piston ring specimen showed law of a stable first and increased then,before 2min,the wear of piston ring specimen was small.4.Experiments show that the machine can improve the tribology properties of the liner effectively.Under the condition of the other parameters remain unchanged,using the machine treat surface of the cylinder sample for 2min,the cylinder sample can show the better friction and wear properties.