| Aviation engine is the "heart" of aircraft, working in high-temperature, high-pressure and high-speed extreme environment for a long time, has an important influence on the performance of the aircraft, is related to aircraft safety and reliability. Accessory drive system is an aircraft engine gears, complete the power transmission from the engine drive shaft to the functional components, provide power for accessory devices. An aviation engine accessory drive system bearing bushing material used mainly aluminum and steel, two materials to use in the actual prototype surface in varying degrees of wear and abrasion problems, leading to the development of aero-engine system and the whole engine fail and the failure rate is high. From the perspective of tribology, wear mechanism of the two materials to explore, to predict wear failure law to provide the theoretical basis and guidance for the design of the bearing bush through tribology design.This paper mainly about aero engine accessory drive system of bearing bush the actual use of two bushing materials bearing 2A12 aluminum alloy and 16Cr3NiWMoVNbE steel and bearing steel GCr15 matched pair analysis and research results of friction and wear testing machine.Including testing, roughness testing hardness, tensile properties and impact toughness testing.In this paper, the properties of different Counterpair factors in determining the working conditions and the use of HRS-2M reciprocating friction and wear tester to GCr15 steel pins to slide,2A12 aluminum and 16Cr3NiWMoVNbE steel grinding parts for the friction and wear test Research.The use of friction and wear tester data acquisition friction factor changes over time, the use of L-200-type photoelectric analytical balance to measure the amount of wear 16Cr3NiWMoVNbE or 2A12 aluminum and steel materials. The main consideration test load, frequency, and media environment three factors.The main consideration test load, frequency, and media environment three factors. First of all, to consider changes in load, frequency, and media environment experimental study conducted univariate wear. Come to change the load, frequency, medium impact on the wear resistance of the material are larger. Secondly, the proposed level of uniform design method using three-factor test program designed to study the tribological properties of the coupling of two under three factors bearing bush materials. Three different combinations of factors come a greater impact on the role of the two materials by grinding and abrasion resistance.In this paper, SSX-550 scanning electron microscopy and spectroscopy analysis of the surface material of two bearing bushings were worn surface morphology and chemical element analysis, to explore the wear mechanism. The results showed:under dry friction, a certain frequency, different load, the wear mechanism of 2A12 aluminum alloy mainly as adhesive wear and abrasive wear, accompanied by oxidation wear. Wear mechanisms 16Cr3NiWMoVNbE steel materials mainly for abrasive wear and adhesive wear, accompanied by fatigue wear; loads certain frequencies different wear mechanisms 2A12 aluminum alloy material mainly for abrasive wear and fatigue wear accompanied by oxidation wear. Wear mechanisms 16Cr3NiWMoVNbE steel materials mainly for abrasive wear and adhesive wear, accompanied by fatigue wear. In different media conditions, compared with dry friction, the two materials in the 4050 aviation fuel and environmental MoS2 powders showed good wear resistance.This article also uses the gray theory GM (1,1) model of single-factor test data modeling and prediction, to establish a database of 2A12 aluminum alloy friction and wear and 16Cr3NiWMoVNbE steel materials for the aero-engine accessory drive system designed to provide a test of basic data through optimized selection to improve the reliability and service life of the transmission system accessories. |
PDF Full Text Request