案例分析-活塞环、缸套

对凸轮轴进行了模拟试验，实现了新材料研发的快速筛选，出厂前成品的抽检等。大大提高了研发及生产效率，为发动机的性能提供了可靠的保证。

实现了新材料研发的快速筛选、出厂前的成品抽检以及众多供应商产品质量的统一，从根本上实现了体系化的质量管理，大大提高了产品合格率。

TE33发动机动力及其传动机构各部件摩擦试验机等设备对气门进行了不同工况的模拟实验，实现了新材料研发的快速筛选、不同工况的磨损研究，以及众多供应商质量的统一，大大提高了气门及发动机的使用寿命。

Abstract The commercialattractivenessof rolls with greaterresistanceto wearandfatiguedamageis substantial.providing reducedrolling mil down times. increasedroll life. reducedproductsurfacedefectsand improvedstockgaugetolerances.Relatively little is known about1&' wearmechanismsof thesematerialswhich limit the usefullife of cold rolling mill work rolls.Two steelsof composition0.8%C/3%Craid 0.8%C/5%Cr. which are representativeof industry standardmaterials.havebeentestedin a rolling-sliding configuration (slippage.8C1t-againsta high speedsteel (M2) counterface.A comparisonhasbeenmadebetweensamplesmanufacturedby conventional processiDl (castingandforging) andby sprayforming. Sprayforming provideda microstructuresimilar to thatof the heavilyforged materialbutwitJt afiner averagecarbidesize (134 nm in thesprayformedand317nm in theforged,bothfor the3%Crsteels)andthesprayformedmaterill did not containthe occasionalcoarsecarbides( - 2 ~m) found in theforgedmaterial.The increasein Cr contentfrom 3% to 5%changed thecarbidefrom (Fe.Cr)3C (3%Cr steel) to (Fe.Cr)7C3(5%Crsteel) in bothsprayformedandforgedmaterials.However.boththe~ sizeandcarbidetype hadlittle effectonwearratewhentestedin thequenchedandtemperedcondition.Temperingof thequenchedsteelwa.s; undertakenin thetemperaturerange200-500 °c. which yieldedhardnessin the range540-890 H. for the 3% Cr steeland470-880 H. fIX" the 5% Cr steel. The wear coefficient decreasedsignificantly for an increase in hardnessfrom to 470 H.(k-l.72X 10-5mm3 N-1 m-l) ~ 750 H. (k-l.35X10-6 mm3N-1 m-l)but only fell slightly for hardnessvaluesabove750 H.. The friction coefficient was0.49-0.6.1': irrespectiveof loador materialtemper.Characterisationof worn surfacesindicatedthatsurfacestrainwaslimited to adepthof - 5-15 ~