The main function of adding defoamers to metalworking fluids

In the process of metal cutting, small chips, metal powders, and grinding wheel sand particles and dust are often generated. This is particularly severe when machining cast iron and grinding with cutting fluid defoamers. In order to prevent these small chips and powders from sticking to each other or to the workpiece, tool (grinding wheel), and mold, which may affect the surface roughness and accuracy of the workpiece and the service life of the tool, it is required that the metalworking fluid has a good cleaning effect. The cleaning effect of machining fluid is manifested in two aspects: firstly, reducing the adhesion of small chips and powders for easier cleaning; The second is to use the cleaning effect of metal processing fluid defoamers to wash away these chips and dust.

The cleaning effect of metalworking fluid is related to factors such as its permeability, fluidity, viscosity, and usage pressure. The permeability and fluidity are related to the composition of the metalworking fluid. Adding some alkaline compounds (such as sodium sulfonate, triethanolamine, etc.) to the machining fluid can improve its cleaning performance. 

After grinding with emulsion, a layer of fine sand particles and black ash adheres to the grinding wheel; After grinding with extreme pressure emulsion, there is a layer of black ash on the grinding wheel; After grinding with fully synthetic machining fluid, there are no fine sand particles or black dust on the grinding wheel, and the cleaning performance is the best. Therefore, using fully formed machining fluid for grinding can effectively reduce the surface roughness of the workpiece and extend the service life of the grinding wheel. 

Generally speaking, defoamers for fully formed machining fluids have better cleaning effects than emulsions and cutting oils. The lower the concentration of emulsion, the better the cleaning effect.