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Basics of Coolant Management

Industrial Lubricants are always a vast and interesting subject to discuss and share. Broadly Industrial Lubricants can be discussed in two verticals – one is of course Factory, Plant & Machinery [ FPM ] products like Hydraulics, Gear Oils, Compressor Oils, etc. Another is Lubricants used in processing. In the later segment, one of the most sensitive portfolios is water extendable cutting coolants used in metal processing industries. Many technical publications and in-depth experiences are shared for the maintenance of cutting coolants. However, today's effort is to address the basics of maintenance of Soluble cutting coolants either mineral based conventional high oil content products or new generation semi-synthetic products. Before going into maintenance practices let us have a quick look at the composition and chemistry of Cutting coolants. New generation cutting oils are a complex combination of Lubricity components blended with Emulsifiers, Co-emulsifiers, Corrosion Inhib

Relation Between Friction, Wear & Lubricants

(R.S) What is Friction:-   Friction is the resistance to motion and wear is the loss of material as a result of friction, contact fatigue and corrosion. Reducing friction is a key objective of lubrication, but there are many other benefits of this process. Lubricating films can help prevent corrosion by protecting the surface from water and other corrosive substances. Different Types of Friction:- Sliding Friction:-  The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be called kinetic friction. Sliding friction is intended to stop an object from moving.    Rolling Friction:-  In simple words Rolling friction is the force resisting the motion when a body rolls on a surface.     Also there some more types of friction is there like Boring Friction, Mix of Sliding & Rolling Friction, Internal Friction of a deform-able body. Majorly in all types of application, we can see these types of friction & the main purpose of

Can Lubricants Increase Friction?

  Lubricants like any types of greases & oils usually used to reduce the effect (heat generated when the surface move) of friction or we can say that its decrease the friction between surfaces in mutual contact rather increasing friction. A good lubricants or proper lubrication process does not only reduce friction but also it has multi functional tasks mentioned below. 1st & for most lubricants used to separate or lubricate two moving surfaces. 2nd A good lubricant or if you have selected proper lubrication process then lubricants can be a good sealant & can be used for sealing process. 3rd one of the major role of lubricants is to reduce the heat generated by two moving surfaces in mutual contact. Lubricants can act as coolant. Last but not the least Lubricating oils & greases can also protect material from different types of foreign particles, which can damage the materials like bearing, gears etc. & protects from oxidization and corrosion. To clarify how lubrica

What is Tribology, Tribosystem & Lubrication

 In article, we have shared the basics about Friction, Wear & Lubricants. Thank you very much for the support extended by liking & sharing the article with your network. Today we are trying to share with you some information about Tribology & Tribosystem. Before understanding the Tribology & Tribology, if you still have not reached to the article of the Basics of Friction, Wear & Lubricants article then I suggest you to once go through the article. It will help you to understand the Tribology & Tribosystem in a better way.

What is Tribology:-

Tribology is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear & also encompasses how interacting surfaces and other tribal-elements behave in relative motion in natural and artificial systems. Tribology is not an isolated science, but rather a complex, multidisciplinary endeavor where advances are made by collaborative efforts of researchers from fields including mechanical engineering, manufacturing, materials science and engineering, chemistry and chemical engineering, physics, mathematics, biomedical science and engineering, computer science, and more.

Peter Jost (also known as Hans Peter Jost), was a British mechanical engineer. He is the founder of the discipline of tribology in 1966. Now a days Tribology has moved beyond its traditional & historical focus in industrial machinery & mechanize components into the modern sectors of Classical Tribology, Bio Tribology, Green Tribology, Geo Tribology, Nano Tribology, Tribotronics, Computational Tribology, Space Tribology, Open System Tribology.

What is Tribosystem:-

A Tribosystem is defined as a Tribological System composed of at least two contacting bodies and any environmental factor affecting their interaction (“Tribosystem,” Wikipedia). It is essential for tribologists to understand Tribological Systems as it allows them to create and execute Tribological Tests.

What is Lubrication:-

Lubrication is the control of friction and wears by introducing a friction-reducing film between moving surfaces in contact. This film, aka lubricant, can be a solid, fluid or plastic substance with oil and grease being the most common. When it comes to lubrication, there are three different types referred to as regimes: Boundary Lubrication, Mixed Lubrication, and Full Film Lubrication. To understand all types of lubrication regimes first we need to understand Sribeck Curve.

What is Stribeck Curve:-

The Stribeck Curve is a fundamental concept in the field of tribology. It is named after Richard Stribeck, a German mechanical engineer, who first described the concept in 1902. This graph showcases how the generation of lubricant films are critical in the reduction of friction and wear of machine parts.

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Stribeck Curve

1. Boundary lubrication

2. Thin or Mixed lubrication

3. Full Film lubrication

Note:- Lambda (λ) (Specific Lubricant Film Thickness) is the ratio of the minimum lubricant film thickness (V1) divided by the average surface roughness of the surfaces in contact (Ra1 + Ra 2).

Lambda (λ) = Minimum Lubricant film thickness (V1) / {(Ra1 + Ra 2) / 2}.

Our aim is always try to get Full Film lubrication to increase the life of the application by reducing friction & wear.

Boundary Lubrication:-

We generally want to avoid boundary lubrication where possible. It is observed by lubrication specialists that friction may be at its highest level during the boundary lubrication regime. Boundary lubrication exists where there are frequent starts and stops, and also where shock-loading or continues high loading conditions are present. A main method of reducing boundary lubrication is to provide the correct lubricant viscosity.

So, In Boundry Lubrication process we should select correct base oil viscosity with extreme pressure (EP) or anti-wear (AW) additives. These EP and/or AW additives adhere to the metal surfaces to form a sacrificial layer that protects the metal from wear & protect surfaces.

Full Film Lubrication:-

Full-film lubrication exists in two forms: hydrodynamic and elastohydrodynamic. Hydrodynamic lubrication (HL) occurs when two surfaces in sliding motion are fully separated by a film of fluid. Elastohydrodynamic lubrication (EHL) is very similar to HL but occurs when the surfaces are in a rolling motion (relative to each other).


Mixed lubrication:-

Mixed Lubrication is a combination between boundary and hydrodynamic lubrication. When the surfaces are separated by a lubricating layer but still the asperities make contact with each other.

Mixed Lubrication
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