Oil-based cutting fluid: How should cutting fluids be managed?
发布时间：2022年07月22日 13:43
Oil-based cutting fluids can be stored for several years, whereas water-based cutting fluids can only be stored for 6 to 12 months. Cutting fluids should be stored indoors whenever possible, at a temperature between 5°C and 40°C. If stored outdoors, avoid direct sunlight and exposure to the elements. In summer, outdoor temperatures in some regions can rise significantly, which is harmful to cutting fluids and may easily cause them to deteriorate. Additionally, it’s important to prevent rainwater from entering. Mixing rainwater with oil-based cutting fluids will reduce their lubricity and anti-rust properties; mixing rainwater with water-based cutting fluids may lead to separation of additives or gelation. The pour point of oil-based cutting fluids typically does not exceed -5°C, and the safety of water-based cutting fluids is generally guaranteed at temperatures no lower than -5°C. Generally speaking, southern regions do not face freezing issues, but northern regions should pay close attention to frost-prevention measures. In particular, once an emulsified cutting fluid concentrate freezes, it will separate when heated and melted, rendering most of it unusable. If a cutting fluid does freeze, after thawing, it should be thoroughly stirred or the container rolled on the ground to ensure even mixing. Then, a sample should be tested to determine whether the fluid can still be used safely.
Containers containing cutting fluids should be kept clean and sealed. Iron drums with galvanized inner surfaces must not be used, as the zinc coating could react with the components of the cutting fluid, forming zinc soaps. When stored vertically outdoors, the opening should face upward and be sealed with a lid. When stored horizontally, the opening should remain at the top to prevent rainwater from entering.
Oil-based cutting fluids are flammable. In general, the closed-cup flash points of cutting oils and emulsified oils are well above 60°C, classifying them as Class C flammable liquids. Although they offer high fire safety, they require strict management.
Daily Management of Cutting Fluid:
1. Detect the number of cells inhibiting bacterial growth in the solution. Cutting fluids—especially emulsified cutting fluids—are particularly prone to contamination, which can promote bacterial growth in the solution. If left untreated, this accelerated bacterial growth will lead to the deterioration of the cutting fluid and the development of unpleasant odors.
2. After machining is completed, the machine tool should be promptly protected. Once machining is finished, use the coolant hose to rinse away any chips and abrasive particles from the machine tool’s surface. Then, open the machine tool’s protective doors to remove the moist air from the machining area.
3. Regularly check parameters such as the concentration and pH value of the cutting fluid. When preparing the cutting fluid, it is generally recommended to use tap water with good water quality, dilute the cutting fluid to the specified concentration, and then thoroughly mix it.
4. Ensure that the cutting fluid pipes are unobstructed and promptly remove metal powders. During metalworking, pipes tend to become clogged with various metal powders. If these blockages are not cleared, the cutting process will be impaired, and the cutting fluid oil will become severely contaminated.
5. Regularly clean the machine tool’s cooling system and promptly replace the cutting fluid. When the solution becomes contaminated after a period of use, causing blockage in the cooling system, it is necessary to clean the system and replace the cutting fluid at the same time.
6. Contaminated cutting fluids should be rigorously purified. Generally, contaminated cutting fluids contain metal powders, fine sand particles, floating oil, free water, and other impurities, and therefore need to be cleaned promptly.
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