What is the cooled state of a coolant used for in machining?

The cooled state of a coolant in machining is primarily used to reduce friction and heat generated during the cutting process. This cooling effect is crucial because it helps maintain the optimal temperature of both the cutting tool and the workpiece, preventing overheating. Excessive heat can lead to tool wear, reducing the tool's lifespan and compromising the quality of the finished part. Additionally, maintaining appropriate temperature levels helps achieve better dimensional accuracy and surface finish.

While cooling plays a significant role in lubrication, the primary purpose of the cooled state of a coolant emphasizes its ability to manage thermal conditions effectively rather than merely providing lubrication. Enhanced speeds or changes in color are not direct functions of the coolant's cooled state. Thus, its main role is indeed to reduce friction and heat, ensuring efficient and effective machining operations.