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Study of scar diameters

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Study of Grease testing on SUJ2 material

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Study of scar diameters

  1. 1. BITS, PILANI – K. K. BIRLA GOA CAMPUSEffect of Surface Finish On The Friction & Wear-BehaviourOf SUJ2 Bearing Material at different velocity & viscosity. Prepared By P.N Uday 2010H141029G
  2. 2. Introduction(contd.)1. Most greases are used in rolling elements withlesser quantities in plain bearings, gear boxes & opengears.2. A satisfactory grease is expected to:a)Provide adequate lubrication to reduce friction & toprevent harmful wear of bearing components.b)Protect against corrosion.c)Act as a seal to prevent entry of dirt & water. BITS, PILANI – K. K. BIRLA GOA 2 CAMPUS
  3. 3. Introduction3. A grease typically consists of the following threecomponents :-a)Base Oilb)Thickenerc)Performance enhancing additives. BITS, PILANI – K. K. BIRLA GOA CAMPUS 3
  4. 4. Introduction(contd.)4)A base oil usually represents about 90% of the total weight of the grease. It performs the actual lubrication.5)This is commonly a mineral oil, can be a vegetable oil or a synthetic lubricating fluid.6)In most greases refined petroleum oils are used. They offer a good combination of performance characteristics & price. BITS, PILANI – K. K. BIRLA GOA 4 CAMPUS
  5. 5. Introduction(contd.)7) The physical properties important for base-oilselection are:-a)Lubricating properties.b)Viscosity (strength of the lubricating film).c)Resistance to oxidation.(high temperature & life-time).d)Volatility. BITS, PILANI – K. K. BIRLA GOA 5 CAMPUS
  6. 6. Methodology1)Three different surface roughness of discs were considered:-a)Rough (Ra - 0.3-0.5 µm)b)Medium (Ra - 0.1-0.3 µm)c) Smooth(polished) (Ra - 0.01-0.09 µm)2) Three greases with different viscosities were chosen:-a)N6C (10cst)b)Microlon (25cst)c) Chemtura (20cst) BITS, PILANI – K. K. BIRLA GOA 6 CAMPUS
  7. 7. Methodology(contd.)3) Finally three different velocities of operation wereconsidered:-a)V1 = 0.25 m/sb)V2 = 0.5 m/sc)V3 = 0.75 m/s4) Hardware used :- the TRIBOMETER (CETR)5) Software used :- UMT6) Module used :- Ball on Disc BITS, PILANI – K. K. BIRLA GOA 7 CAMPUS
  8. 8. Methodology(contd.) BITS, PILANI – K. K. BIRLA GOA 8 CAMPUS
  9. 9. RESULTS coeff of Ra V D W T Grease Distance R.P.M d1 d2 Avg Scar Dia friction0.0389 0.25 30 400 66.66 N6C(10cst) 1000m 159.23 935 942 938.5 0.1234 0.49 0.75 50 400 22.22 N6C(10cst) 1000m 287 1101 1083 1092 0.12530.2531 0.25 30 400 66.66 Microlon(25cst) 1000 159.23 700 673 686.5 0.1244 0.012 0.75 50 400 22.22 Microlon(25cst) 1000 287 896 833 864.5 0.12550.2531 0.5 50 400 33.33 Microlon(25cst) 1000 191 875 876 875.5 0.1223 Chemtura0.0118 0.25 30 400 66.66 1000 159.23 906 932 919 0.1142 sample1 Chemtura0.0329 0.75 50 400 22.22 1000 287 705.7 653.6 679.65 0.09392 sample1 BITS, PILANI – K. K. BIRLA GOA 9 CAMPUS
  10. 10. Scar Images BITS, PILANI – K. K. BIRLA GOA 10 CAMPUS
  11. 11. Scar Images(contd.) BITS, PILANI – K. K. BIRLA GOA 11 CAMPUS
  12. 12. Conclusion1)Selection of grease is very important.2)Polished surfaces are the best for bearings.3)The base oil of a grease has to be a good grade oil especially mineral oil.4)Chemtura has Calcium Sulphonate as the base oil which is the best. BITS, PILANI – K. K. BIRLA GOA 12 CAMPUS
  13. 13. ThanksBITS, PILANI – K. K. BIRLA GOA CAMPUS 13

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