During metal cutting, the tool experiences intense heat and pressures. If unchecked, these forces and generate significant tool wear. Also, high temperatures and pressures can result in a built-up edge, where workpiece material welds to the cutting edge. This makes it hard to maintain accurate dimensions and a good surface finish.

The Critical Role of the Fluid

Most cutting operations use a metalworking fluid to reduce friction between the tool and workpiece surface while also cooling the tool. This helps prolong tool life and improve the surface finish and quality of the workpiece.

When it comes to a cutting fluid, a major benefit is lubricating the point of contact between the cutting tool and workpiece. Oil-based fluids are effective in reducing friction, but many metalworking fluids contain additional additives to boost lubricity and protection from extreme pressure. By reducing friction, the fluid helps minimize tool wear and generate an improved surface finish.

Metalworking fluids also must cool the tool and workpiece. Water-based fluids offer excellent cooling but are less effective at reducing friction. Again, various additives are often added to the fluid to optimize these properties.

Other Fluid Benefits

Beyond reducing friction and cooling the tool and workpiece, a metalworking fluid plays other key roles. It helps flush away chips from the cutting zone. It also needs to avoid foaming so that the fluid fully engages the cutting zone for optimal cooling and lubricating. It has to be compatible with the workpiece material to avoid corrosion or staining. And, it must guard against microbial or biological contamination, as the fluid is stored in a sump and reused over time.

There is no one ideal metalworking cutting fluid. The right fluid depends on the machine operations, the workpiece materials, the cutting tool along with other numerous factors. Choosing the right fluid results in better tool life, workpiece quality and overall productivity.

See related posts to learn more:

How It Works - Metalworking

How it Works - The Types of Metalworking Fluids

How it Works - What's the Role of a Metalworking Fluid?