PPT on Air Lubrication by Love soni

1. PRESENTED BY :-
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2. LUBRICANT

3. What Is Lubricant ???
The Substance Which Is
Used To Decrease The
Friction Between Two
Moving Parts Of A Machine
Is Know As Lubricant.
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4. FRICTION
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5. What Is Friction ???
Any Force That Resists Motion Is Know As
Friction. For Example:-
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6. Disadvantages Of Friction :-
 It Decreases The Efficiency Of
Machine.
 It Causes Wear And Tear In
Machine.
 It Causes Loss Of Energy Which
Turns Into Heat Energy.
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7. Due To The
Harmful Effects
Of Friction We
Use LUBRICANT
To Reduce The
Friction.
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8. Function Of A Lubricant
• Lubricant - Reduce Friction
• Cooling - Avoid Heating
• Noise Pollution – Reduce The
Noise Of A Moving Machine
• Sealing – Prevent Leakage
• Protection – Prevent Wear &
Tear and Corrosion
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9. Reduce Friction
There Are Some Irregularities
Present On Surface Which
Produce Friction And The
Lubricant Fills The Irregularities
And Make It Smooth And
Friction Less.
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10. Cooling
Lubricant Reduce The Friction
Between The Two Parts And Avoid
The Production Of Heat Energy
And Remain The Machine Cool.
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11. Noise reduction
By Preventing Metal To
Metal Contact Lubricant
Avoid Noise By Making A
Layer Between Them.
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12. Sealing
It Also Works Like A Seal In The
Machine By Making A Oil Film
And Avoid Leakage.
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13. Protection
• Protection Against Moisture &
corrosion.
• To Increase Life Of Machine Parts.
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14. Types of Lubricant – Physical
state:-
• Liquid
• Solid
• Semi solid
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15. LIQUID LUBRICANT :-
MINERAL OIL
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16. VEGITABLE OIL
&
BLANDED OIL
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17. ANIMAL
OIL
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18. Synthetic Oil
It Works At -50 To -250 Degree Celcius
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19. SOLID LUBRICANT :-
1. GRAPHITE 2. MOLYBDENUM
DI
SULPHIDE
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20. SEMI SOLID :-
GREASE
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21. Properties of lubricants
• Viscosity
• Viscosity index
• Cloud & Pour Point
• Flash Point & fire point
• Total acid Number (TAN)
• Oiliness
• Emulsification
• Volatility
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22. Viscocity :-
• The Property Of A Liquid
Which Resiste Its Own
Flow Is Know As
Viscocity.
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23. Viscocity Index :-
The Rate Of Change Of
Viscocity With
Temperature Is Know
As Viscocity Index.
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24. Cloud & Pour Point :-
Cloud Point – The Lubricating Oil
Cool Slowly The Temp. At Which It
Becomes Cloudy Is Called Cloud
Point.
Pour Point – The Lubricating Cool
Slowly The Temp. At Which It
Ceases To Flow Or Pour Is Called
Pour Point.
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25. Flash & Fire Point :-
Flash Point – The Lowest
Temp. At Which The Oil Gives
Off Enough Vapours That
Ignite For A Moment When A
Small Flame Is Brought Near It
Is Called Flash Point.
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26.  FIRE POINT – The Lowest
Temp. At Which The Oil Gives Off
Enough Vapours Which Burns
Continuously For 5 Seconds When
A Small Flame Is Brought Near It
Is Called Fire Point.
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27. TOTAL ACID NUMBER (TAN):-
The No. OF MILLIGRAM OF
POTASSIUM HYDROXIDE
REQUIRE TO NEUTRALISE
THE FREE ACID PRESENT IN
1 Gm OF OIL IS CALLED
TAN.
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28. OILINESS :-
The Capacity Of Oil To Stick To
The Surface Of Machine Under
Condition Of Heavy Pressure
Or Load Is Called Oiliness.
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29. EMULSIFICATION :-
The Property Of Oil To Get
Intimate Mixed With Water
Forming A Colloidal Sollution
Or Emulsion Is Called
Emulsification.
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30. VOLATILITY :-
The Tendency Of Oil
Vapourised With Increase Of
Temp. Is Called Volatility.
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31. CHARACTERISTICS OF
GOOD LUBRICANT:-
1. LOW VAPOUR PRESSURE.
2. HIGH BOILING POINT.
3. NON CORROSIVE NATURE.
4. GOOD THERMAL
CONDUCTIVITY.
5. ADEQUATE VISCOSITY.
6. HIGH FLASH & FIRE POINT.
7. HIGH OILINESS.
8. LOW VOLATILITY.
9. LOW FREEZING POINT.
10. DOES NOT FORM EMULSION.
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32. MECHANISM OF
LUBRICATION :-
1. Hydrodynamic/Fluid
Film/Thick Film Lubrication
2. Thin Film/Boundary
Lubrication
3. Extreme Pressure
Lubrication
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33. HYDRODYNAMIC
LUBRICATION :-
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34. Love soni

35. BOUNDARY
LUBRICATION :-
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36. EXTREME PRESSURE
LUBRICATION :-
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37. Love soni

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40. Thank you
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