Bearing of the piston and piston ring is located in the heart of the engine, its working quality fit and unfit quality directly affect the sex of the engine.Modern engine piston with aluminum alloy material.Its main advantage is quality light heat conduction performance is good.Piston and piston ring is a pair of friction.To make it work to achieve optimal performance, in terms of choosing raw materials and coating material in the working face, should first consider the matching between sex.Chemical passivation treatment such as piston ring end face, the piston type should be chosen AEB5 eutectic aluminum Cu content (5%) as materials, and phosphating process was carried out on the piston ring groove.With the constant improvement of the engine power and extend the working life of piston, ordinary aluminum alloy piston is hard to meet the requirements, many of the better performance of new materials used in the piston.The performance of the aluminum matrix composites have reached to use the best material of Ni - resist, cast iron, and made into piston and piston ring, the quality is greatly reduced after compared with the ordinary aluminum alloy material its high temperature strength and thermal fatigue resistance increase obviously, and has lower linear expansion coefficient.Can improve the service life of the piston and reduce fuel consumption and exhaust emissions, improve engine power.Japan's Toyota motor has been widely used in the material, the company also developed to make the car engine enclosed of expanded graphite.Sliding bearing is four times higher than aluminum, 5 times higher than copper heat transfer coefficient, and relatively low density, light quality, producing cost is not high, can not only reduce the quality of 40% (compared with the system of gold scrap material), and cooling refrigeration, can effectively increase the engine power output, improve work efficiency.
Ductile iron material used to using normalized to improve strength.With mature production technology, the as-cast pearlite nodular cast iron crankshaft is gradually replacing the ball graphite cast iron crankshaft.Because of the graphite ball number increase, matrix was full of pearlite, thus can get higher action under the as-cast mechanical properties.As-cast crankshaft is without heat treatment, such not only simplify the production process, to reduce the energy consumption and production cost, also avoid man-made factors of internal stress, thereby reducing the crankshaft after the machining deformation in the case of surface quenching strengthening treatment.EQl092 automobile crankshaft production, for example, as long as the as-cast matrix was pearlite content not less than 75%, shaft neck surface quenching hardness is higher than that of platinum HRC, the deformation is less than 0.3 mm, but the original ball graphite cast iron crankshaft, surface after quenching, large crankshaft deformation and instability, an average of 15 ma, maximum of 3.5 mm.
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