Introduction
Cutting fluids are special kinds of fluids used to lubricate and cool down the cutting tools and workpiece during the machining process. It is considered useful in terms of various factors such as efficiency, quality and cost-effectiveness of various metal-cutting operations. They are also used to improve the finished surface of the machine parts, extend the lifespan of the tools and reduce the risk of tool failure. It is important to select the correct right fluid to achieve optimal results during the metal cutting operations.
Basic Classification of Cutting Fluids
Below stated are the basic classification of cutting fluids along with their advantages and limitations:
- Emulsions: Emulsions are also known as water-based cutting fluids as they are composed of water, emulsified oil and various additives. The advantage of these cutting fluids is low cost and good cooling performance. It is also ideal for machining operations that require substantial heat dissipation. However, the limitation of those fluids is that they are prone to bacterial growth and are highly corrosive due to which it needs strict control and regular maintenance.
- Fully Synthetic Fluids: This is a type of fluid that does not contain petroleum oil base. It is only composed of various chemical additives. Some of the advantages of these are that these fluids provide excellent cooling and lubrication while resisting bacterial growth. Thus, it is considered ideal for applications that require a highly clean machining environment. However, its limitation is that fully synthetic fluids are comparatively expensive and some of its chemical components may be corrosive to the machine.
- Semi-Synthetic Fluid: Semi-synthetic fluids are positioned between emulsions and fully synthetic fluid as they contain a certain amount of petroleum oil base and water as its components. The advantage of this fluid is that it balances benefits of both emulsions and fully synthetic fluids such as cooling effect and excellent lubrication capacity. However, its limitations are that one has to pay constant attention to biostability and corrosiveness which can affect the performance of machining environments.
- Straight Cutting Oil: Straight cutting oils are also known as oil-based cutting fluids as they mainly consist of mineral oil or vegetable oil as their components. They are completely water-free and provide superior lubrication by also preventing rusting of the workpiece. Thus, they are considered ideal for machine operations that require high lubrication. However, the disadvantages of this fluid are that it has a low heating capacity and the cooling effect is not as good as water-based fluids. This limitation can affect the high-speed and high-temperature machining.
- Soluble Oil: Soluble oil is a mixture of both oil-based and water-based fluids along with emulsions as a component. The advantages of these oils are that they have good lubricity and cooling capacity which makes them suitable for various machining needs. However, its limitation is that it requires strict control over the dilution ratio and water quality. The bacterial growth and corrosion also need to be kept in check for the safety and efficiency of the machine.
Factors to Be Considered While Choosing the Cutting Fluids
Below stated are some of the important factors that should be considered while choosing the cutting fluids:
- Materials Being Machined: It is important to know the type of material that is being machined while choosing the cutting fluid. This is because, different materials have different properties such as hardness, ductility or thermal conductivity. These properties tend to impact the machining process and the choice of cutting fluid. For example, as aluminum is a soft metal, soluble oils or synthetic fluids are more suitable for aluminum machining to dissipate heat and prevent it from melting.
- Cutting Operation: Another important factor to be considered is the type of cutting operation. Every different cutting operation such as drilling, milling or turning requires a different type of cutting fluid. For example, emulsions or soluble oils are suitable for drilling operations as these operations require cutting fluids that can reach the small particles between the drill bit and workpiece. On other hand, synthetic fluids are more suitable for turning operations as these require cutting fluid that can be applied on the surface evenly.
- Machining Condition: Different aspects of machining conditions such as speed, feed and depth of the cut should also be kept in mind while choosing the cutting fluid. For example, higher cutting speeds tend to generate more heat and require cutting fluids that can dissipate heat. On other hand, higher feed rates and deeper cuts require cutting fluids that can provide exceptional cooling and lubrication.
- Environmental Concerns: Environmental regulations and restrictions should be taken seriously while the usage and disposal of cutting fluids. Some cutting fluids can be proven hazardous to the environment if not disposed properly. Thus, those environmental regulations should be followed strictly. One can also use cutting fluids that are biodegradable or recyclable to preserve the environment.
- Health and Safety: Cutting fluids can be a health and safety risk if not handled properly. Some cutting fluids contain chemicals causing skin irritation, problems while inhalation, or flammability. Thus, it is important to take necessary precautions such as wearing protective clothes and respirators while using the cutting fluids.
- Cost: The cost of cutting fluids varies greatly. Thus, it is important to choose the cutting fluid that is cost-effective along with the performance and longevity.
Take Away
This is the brief explanation about cutting fluids, its basic classifications and ways to select it correctly. We hope those tips will be effective for you. Please let us know through your valuable feedback and the suggestion in the drop box.