CUTTING FLUIDS Lesson Objectives Explain the function and importance of cutting fluids in metal-removal operations Describe the characteristics and advantages of the most common types of cutting fluids Select the proper cutting fluid to suit various metals and machining operations.

CUTTING FLUIDS OBJECTIVES State the importance and function of cutting fluids. Identify three types of cutting fluids and state the purpose of each Identify cutting fluid application methods. Lesson Objectives Explain the function and importance of cutting fluids in metal-removal operations Describe the characteristics and advantages of the most common types of cutting fluids Select the proper cutting fluid to suit various metals and machining operations.

Cutting Fluid Functions Lubrication reduces heat-creating friction: improved chip flow. 1/3 of the generated heat can be reduced. Cooling removes heat from 1) the cutting tool 2) the chip 3) the work-piece

NONCUTTING FUNCTIONS Rust & Corrosion Prevention Non-flammability protects the machine and machined parts Non-flammability preferably noncombustible and should not smoke excessively. Bacterial Control Bacteria will eventually destroy water-based cutting fluids. (And make it stink)

CUTTING FLUID BENEFITS Increased Productivity Reduced Friction and Heat Higher Speeds can be used Reduction of Labor Costs Less downtime Improved Surface Finishes Reduction of Tool Costs Reduced Tool Wear Improved Accuracy

Types of Cutting Fluids Emulsions (water soluble) Semi-synthetic (semi-chemical) Synthetic (chemical Fluids) Straight Cutting Oils

Synthetic Fluids (chemical fluids) Contain very little oil Depend upon chemical agents for: 1) lubrication 2) rust prevention 3) bacterial control

Emulsions (Soluble Oils) Mineral oils mixed with water Emulsifiers are needed.

Semi-synthetic fluids Chemical fluids mixed with cutting oils Two main types: 1) plain type 2) extreme-pressure type - chlorine and sulfur are added

Straight Cutting Oils Not mixed with water. Two classifications 1) Inactive Cutting Oils - very little sulfur is released/does not react 2) Active Cutting Oils - releases sulfur/reacts with work surface

CUTTING FLUIDS Applications: Flood Spray-Mist

CUTTING FLUIDS Applications: Through the Tool

CUTTING FLUIDS Review Questions Name two important functions of a cutting fluid. Name the four main types of cutting fluids. Name 3 methods of applying cutting fluids. List the non-cutting functions of a good cutting fluid. What is a emulsifier? Name the two classifications of straight cutting oils.

ANY QUESTIONS?