Houghton International Inc. Houghton Fluid Performance Requirements Historically and at present, the primary function of a grinding fluid is cooling. A fluid should also inhibit corrosion of the workpiece and the machine. Swarf control is needed to remove the debris of grinding so that the operation can proceed unimpeded. A grinding fluid should be nonglazing, although this property depends on the nature of the wheel as well as the fluid. Foaming should be minimized.
Foam reduces the contact between the cooland and the workpiece by introducing air to the system.
The grinding fluid should be biostatic so that the growth of microorganisms and the resultant souring of the fluid is kept to a minimum. Good tramp oil rejection allows the mechanical lubricants used in the grinder to be easily removed if small quantities are introduced inadvertently. Filtration of grinding fluid is another consideration. Most fluids can be filtered, but often the importance of removal of swarf from the system is overlooked. The control of pH is important for rust protection and biostatic activity.