The break-in stage of cylinder-ring wear: A correlation between fired engines and a laboratory simulator |
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| Affiliation: | 1. SoNovum AG, Leipzig, Germany;2. MTZ Clinical Research, Warsaw, Poland;3. Department of Cardiology and Internal Medicine, Military Institute of Medicine, Warsaw, Poland;4. Sonomed Sp. Z o. o., Warsaw, Poland;1. School of Mechanical and Electrical Engineering, Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Jiangsu Province, Xuzhou, 221116, China;2. Citic Heavy Industries Co. Ltd, Luoyang, China;3. Luoyang Mining Machinery Engineering Design Institute Co. Ltd, Luoyang, China;4. State Key Laboratory of Mining Heavy Equipment, CITIC HIC, Luoyang, China;5. College of Mechanical Engineering, Chongqing University, Chongqing, 400044, China;1. Research Scholar, School of Mechanical and Building Science, VIT University, Chennai, India;2. School of Mechanical and Building Science, VIT University, Chennai, India |
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| Abstract: | The wear of the piston ring-cylinder wall contact area in fired engines has not been satisfactorily simulated in bench testers so far. This paper reports the development of a successful test device in which the same progression of surface change occurs as in fired engines. These changes were observed by microscopy, by hardness indentations and by the use of the stylus roughness tracer. The test device uses ring and cylinder segments and it oscillates at 350 cycles min-1 over a stroke of 19 mm. It is apparently not necessary to duplicate the temperature, atmosphere, fluid film thickness and other obvious conditions in an engine to achieve simulation. At least, the materials in the engine were not affected by the conditions in the engine that were not duplicated in the laboratory tester.The purpose in developing the tester was to study the role of the honed roughness pattern found on most cylinder walls. Several engine manufacturers attempt to achieve “fplateau honing”. No manufacturer polishes new cylinder walls. The reason for the honed roughness is to allow a high wear rate, without catastrophic scuffing, in locations of high stress between poorly conforming parts. |
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