GrindSmart® Nano6
GrindSmart® 629XW
GrindSmart® 629XS
GrindSmart® Np5
GrindSmart® 529XF
LaserSmart 500

PVD/PeCVD/Hybrid, Edge
Preparation, Plasma Nitriding
Machine, Turnkey

The Right grinding fluids for every machine!
Foaming behaviour of the basic oils
Poor foaming behaviours and air release properties result in filter systems foaming over and poor grinding results. Since the air trapped in the oil is compressed, the decompression that occurs when it leaves the cooling lubricant nozzle cause cavitation that results in increased wear. A laminar jet can no longer be directed onto the grinding wheel. The use of low- foam grinding oil with good air release properties thus increases the process reliability. The tests carried out in our development centre illustrate the foaming behaviour and air release properties of different basic oils. In the figures below, the sample bottles were each filled with mineral oil, hydrocrack and polyalphaolefin and heavily enriched with air. This creates foam and the air is trapped in the basic oil that is clearly visible as bubbles. A crucial factor for the foaming behaviour and air release property is how quickly the trapped air can escape from the basic oil and how quickly the foam thereby breaks down.

Evaporation Loss
Despite a boiling point of the oil of 250°C, oil vapours are constantly produced due to evaporation. these result not only in continuous loss of the medium (oil), but also significantly burden the surroundings of the company. the highest evaporation rates naturally occur with watersoluble cooling lubricants. Due to their uniform composition, polyalphaolefin- based grinding oils have a roughly two- thirds lower evaporation loss than conventional hydrocrack and mineral oil products.
Air release property
The air release property is determined by measuring how many minutes the air bound in the oil requires to leave the medium again down to a residual content of 0.2% v/v. Every air bubble trapped in the oil later interrupts the lubricant film of the medium during the process. Hence, the more air there is in the oil and thus in the process, the poorer will be the machining result. Polyalphaolefins are characterised in particular by an outstanding air release property and thus offer a significantly higher process reliability.

The figure shows the different grinding results with two different grinding oils
under the same test conditions. The significantly better results in all the trials
were obtained using the SintoGrind grinding oil developed by oelheld.