Grinding fluids for hard metal grinding
Hard metals such as tungsten carbide contain significant amounts of Cobalt in their make-up. It has been shown* that if released into the work place, Cobalt poses a health hazard to machine operators. If conventional synthetic grinding fluids are used to grind carbides, Cobalt is automatically released into the fluid and builds up to harmful levels. A specialist product is therefore required to prevent such levels being present in the fluid. Supergrind CG is a specially developed water miscible fluid free from boron, amines and nitrite designed to overcome this effect and to prevent and/or suppress the dissolution of Cobalt. When used as directed, the product is capable of suppressing dissolved cobalt to extremely low levels (a fraction of a part per million in solution) to protect the operative from harmful exposure. Low Cobalt dissolution rates ensure longer fluid life and a safer working environment for the operator. It is recommended that Cobalt levels in the fluid are monitored regularly and maintained at levels below those considered safe by the authorities.
The basic function of the grinding fluid when grinding hard metal is to remove the heat generated in the grinding operation, to lubricate the tools in order to reduce wheel wear, and to remove grits from the grinder.
Water based oil in water emulsion and water soluble synthetic lubricants are the most common grinding fluids. But refined neat oil of type white oil is frequently used for grinding of cobolt based hard metal. One of the reasons for this is to avoid skin allergy at water based coolant in which cobolt can be dissolved and also to reduce the wear of the grinder.
Water based coolant have some drawbacks such as growth of fungis and bacteria, inferior lubricity, formation of metal soap that clogg the grinding wheel, and it dissolves cobolt which causes health problems.
Neat oil has inferior heat removing capacity compared to water based coolant. For this reason external chillers are used to enhance the cooling capacity.
Particles generated in the grinding operation can be of very small dimension, in diameter. Grinding fluids with high content of particles reduce the grinding speed and muck up the machine tool and coolant tank requiring frequently maintenance.
For the initial grinding and regrinding in all areas of carbide tooling which includes carbide inserts, end mills, tipped saw blades, drill tips et cetera.
As a flood coolant and to enable the inhibitor systems to work correctly, a working strength must be maintained at between 2-4%.
Note: This is not normally recommended for mixed metal grinding.
Pale straw liquid
Relative Density @ 15.6°C
Emulsion Appearance (2%in 200ppm water)
pH @ 25°C (2% aqueous)
IP 287 Rust Prevention Characteristics (200ppm water)
Foaming Tendency (2% in 200ppm water)
< 20 secs collapse time
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