Proper management of coolant sumps is crucial for extending the lifespan of cutting fluids, reducing production costs, and preventing foul odors in industrial plants. Neglecting maintenance not only reduces cooling and lubrication efficiency but also damages workpiece surfaces and significantly shortens tool life. Guidelines for optimal maintenance of water-soluble cutting fluids are as follows:
1. Concentration Control
• Daily monitoring: Use a refractometer to check the concentration to ensure it remains within the manufacturer’s specified range (usually around 5% – 10%, depending on the application).
• Proper filling method: Always use the O.I.L. (Oil in Water) principle, pouring the oil into the water and stirring until mixed. Never pour water into the oil, as this will prevent the oil molecules from breaking down and cause separation.
• Use good quality water: Use DI (De-ionized Water) or distilled water for mixing. 1. Avoid using highly hard tap water as it will cause the rust inhibitor to degrade more quickly.
2. pH Management
• Maintain a stable pH level: The ideal pH for cutting oil should be between 8.5 and 9.5, which is slightly alkaline.
• Prevent rust and bacteria: If the pH drops below 8.0, the oil will begin to spoil, develop a foul odor, and lose its rust-preventive properties. If a pH drop is detected, immediately add a pH conditioner or replace the oil.
3. Contamination Removal
• Separate trump oil: Hydraulic oil or slide oil spilled into the cutting oil pit will float and block oxygen, allowing anaerobic bacteria to grow and causing a foul odor. An oil skimmer should be installed to regularly remove this oil.
• Remove metal chips from the bottom of the pit: Metal chips remaining at the bottom of the pit are a breeding ground for pathogens and cause wear on the oil pump. Regular cleaning and removal of metal debris is recommended.
4. Treatment and Aeration
• Aeration during long periods: Bacteria grow very well when the oil is stagnant, such as during weekends. The oil circulation pump or air pump should be turned on to add oxygen to the well for about 1-2 hours per day during periods when the machinery is not running to inhibit the growth of microorganisms.
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If you require additional oil well maintenance system planning for your plant, please provide the following information for more specific advice:
• Type of machinery used (e.g., CNC machine, manual lathe, or grinder)
• Type of metal being machined (e.g., steel, aluminum, or brass)
• Main problems currently being faced (e.g., foul odor, rust on workpieces, or oil separation)
