TAILIEUCHUNG - Tribology Handbook 2 2010 Part 12

Tham khảo tài liệu 'tribology handbook 2 2010 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | D2 Plain bearing failures Overheating Characteristics Extrusion and cracking especially of whitemetal-lined bearings. Causes Operation at escessibe temperatures. Thermal cycling Characteristics Surface rumpling and grain-boundary cracking of tin-base whitemetal bearings. Causes Thermal cycling in service causing plastic deformation associated with the non-uniform thermal expansion of tin crystals. Faulty assembly Characteristics Localised fatigue or wiping in nominally lighdy loaded areas. Faulty assembly Characteristics Overheating and pick-up at the sides of the bearings. Causes Stagger at joint faces during assembly due to excessive bolt clearances or incorrect bolt disposition bolts too far out . Causes Incorrect grinding of journal radii causing fouling at fillets. Plain bearing failures D2 Incorrect journal grinding Characteristics Severe wiping and tearing-up of bearing surface. Causes Too coarse a surface finish or in the case of SG iron shafts the final grinding of journal in wrong direction relative to rotation in bearing. Inadequate oil film thickness Characteristics Fatigue cracking in proximity of a groove. Causes Incorrect groove design . positioning a groove in the loaded area of the bearing. Inadequate lubrication Characteristics Seizure of bearing. Causes Inadequate pump capacity or oil gallery or oilway dimensions. Blockage or cessation of oil supply. Bad bonding Characteristics Loss of lining sometimes in large areas even in lighdy loaded regions and showing full exposure of the backing material. Causes Poor tinning of shells incorrect metallurgical control of lining technique. All photographs courtesy of Glacier Metal Co. Ltd D3 Rolling bearing failures FATIGUE FLAKE Characteristics Flaking with conchoidal or ripple pattern extending evenly across the loaded part of the race. Causes Fatigue due to repeated stressing of the metal. This is not a fault condition but it is the form by which a rolling element bearing should eventually .

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