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Why must cooling lubricant be tempered?

The function of a cooling lubricant is to reduce the friction between tool and workpiece in order to generate less heat and thus improve the machining result. The cooling lubricant heats up in the course of this and thus carries away the heat generated from the machining zone.

The cooling lubricant ensures a constant temperature of workpiece and tool, which is imperative for exact tolerances. It is a requirement that the cooling lubricant is always supplied at the same temperature. HOFFMANN filters are therefore almost always equipped with a cooler that is ideally matched to the filter.

In the case of water-based emulsions, which are frequently used as cooling lubricants, the cooling also reduces the growth of germs and thus contributes to occupational safety.