How Classification Of Tribometers Is Done?

Tribometers can be classified on the original equipment's developer or the contact arrangement being simulated

. There are different arrangements that can aid you in making the right choice. Some examples of tribometers are bouncing ball tribometer, four ball tribometer and pin on disc tribometer.

A tribometer is a device used in sectors like the manufacturing industries to aid in measuring of tribological quantities. It is also a term given to a machine that is used to perform simulations and tests of lubrication, wear and friction, the core aspects in the study of tribology. Tribologial quantities are obtained by getting measurements like the coefficient of friction, wear volume and constant friction between two different surfaces coming into contact as well as the friction force. Experts normally use this device in order to enhance their analyzing and testing of the long term performance of the products they manufacture. One particular field where tribometers are used is in the manufacture of orthopedic implants. Tribotesters or tribometers are developed that accurately reproduce and simulate the forces and motions occurring in the hip joints of humans. This enables the manufacturers perform wear tests on their products in an accelerated manner.

The classification of tribometers is dependent on the original equipment's developer or the contact arrangement being simulated. There are several arrangements in use including SVR test machine, Four Ball, Block on Ring, Twin Disc, Pin on Disc and Bouncing Ball. When choosing a tribometer, you should bear in mind that there are different arrangements that can aid you in making the right choice.

The Bouncing Ball tribometer is comprised of a ball impacted at a certain angle against the surface. When conducting a typical test using this tribometer, the ball slides at an angle across the track before it finally makes an impact and bounces off the surface. A rotating force on the ball as well as a horizontal force on the test surface is the result of the friction caused when there is contact between the ball and the surface. The Bouncing Ball can be an ideal choice of tribometer if you would like to determine the reaction of lubricants under different conditions like extreme high pressure that is found in ball bearings and in gears.

The Four Ball tribometer is ideal for use in quality checks and development. When using this device, repeatable action is evident as the top ball and the bottom three balls make a configuration that is unique and that enhances stable and repeatable contact. This helps in the determination and identification of extreme pressure properties like wear prevention properties and the friction action of various lubricants. It is an ideal device for research and development (R&D) projects as the tribometer not only delivers cost effective samples but also quick results.

One of the standout features of the Pin on Disc tribometer is the stationary pin located below an applied load connecting with a rotating disc. The pin could adopt any desired shape to enhance simulation of different contacts. An example would be the use of spherical pins to simulate simple geometrical contact. Those who want to conduct testing for wear and friction on low coatings mainly prefer the Pin on Disc tribometer. To examine the wear that has occurred on a particular surface, you can use different methods and equipment like optical microscopes, mechanical roughness testers, optical inferometry and scanning electron microscopes.

by: Vishal Khosla

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