Lubricants, Coolants | Viscosity of Metalworking Fluids in Cutting Processes

Metalworking fluids are a vital part of manufacturing processes. Viscosity influences the liquid’s performance and the manufacturing quality. SVM is a fast and precise solution to measure viscosity and density, which are quality relevant parameters.

Introduction to Metalworking fluids

Metalworking fluids (MWF) are complex mixtures of base liquids and additives, carefully selected and blended to provide optimum performance in a given application. There are different types: straight oils, oilbased water miscible fluids (emulsions, semi-synthetic fluids), and synthetic fluids.

Metalworking fluids in cutting processes

Water miscible fluids are one main group used in cutting processes such as drilling, milling, or turning, while oils are often used for grinding, honing, or threading. Their main function is to lubricate and cool the contact zone between a machine tool and a work piece. Depending on the combination of work piece and tool, but also on the cutting speed, different fluid compositions are required. Straight oils and oil concentrate are evaluated for viscosity and density, further for pour point, flash point and other parameters. When mixing concentrates with water, the correct dilution ratio can be checked with a refractometer.

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