Advantages of filtering and purifying cutting fluids
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To prevent odors and deterioration of cutting fluids during use, it’s important to take the following measures: 1. Regularly use a refractometer to test the concentration parameters of the cutting fluid. If the concentration is too high, the cutting fluid can easily cause skin allergies in operators; if it’s too low, it may lead to extensive bacterial corrosion. 2. When the pH value of the cutting fluid drops too low, promptly add fresh cutting fluid to raise the pH. Cutting fluids with a pH between 8.3 and 9.2 are less conducive to bacterial survival. 3. Minimize the mixing of oil leaking from machine tools into the cutting fluid as much as possible, since the oils used in machine tools contain bacteria. 4. Keep the workshop environment clean.
To prevent odors and deterioration of cutting fluids during use, the following measures should be taken:
1. Regularly use a refractometer to test the concentration parameters of the cutting fluid. If the concentration is too high, the cutting fluid can easily cause skin allergies in operators. If the concentration is too low, it may lead to extensive bacterial corrosion.
2. When the pH value of the cutting fluid is too low, promptly add fresh cutting fluid to raise the pH. Bacteria find it difficult to survive when the pH of the cutting fluid is between 8.3 and 9.2.
3. As much as possible, minimize the mixing of machine-tool oil leaking out into the cutting fluid, since the oil used in machine tools contains bacteria.
4. Keep the workshop environment clean and ensure that cutting fluids do not come into contact with contaminants such as dirty oil, food, tobacco, and other debris.
5. Conduct thorough training on the operation and maintenance of cutting fluids for workers.
Simply put, this method uses tools such as filters and filter bags to remove floating oils and particulate matter from cutting fluids. However, this approach is unable to filter emulsified oils or tiny particles in the micrometer range. The cutting fluid filtration and regeneration system employs purely physical methods to break up the emulsion of oil, particles, and water. Leveraging air flotation technology, it brings impurities to the liquid surface, where they can be easily separated. This system is particularly well-suited for enterprises with high purification requirements and those engaged in precision machining production.
The filtration and purification of cutting fluids is the process of removing a certain proportion of relatively large solid particles from the cutting fluid. After filtration and purification, the cutting fluid can be reused in machining operations, achieving the goal of circular utilization. The advantages of filtering and purifying cutting fluids are mainly reflected in the following aspects:
1. Extend the replacement cycle of cutting fluid: As proven by practice, the replacement cycle of cutting fluid that has been filtered and purified can be significantly extended.
2. Enhancing the service life of cutting tools and grinding wheels: Recent studies have shown that reducing the concentration of impurities (such as chips and grinding-wheel dust) in cutting fluids from 40 μm to below 10 μm can extend the service life of cutting tools (or grinding wheels) by a factor of 1 to 3.
3. Improve the surface roughness of workpieces and reduce the defect rate.
4. Extending the service life of pipelines and pump units: Solid particles and other chips in the cutting fluid can accelerate the wear of components such as pipelines and pumps.
The filtration and purification of cutting fluids can broadly be categorized into two main types: filtration and separation. However, in actual production, these two methods are often used in combination.
Single-machine filtration of cutting fluid
There are two types of coolant circulation systems: individual-machine filtration and centralized filtration. In an individual-machine filtration system, each machine tool has its own independent filtration system. Such systems typically come standard with the machine tools when they leave the factory; they are generally relatively simple, have lower filtration accuracy, and can only meet the requirements of low-precision production—not high-precision needs. This independent filtration approach is usually suitable for situations where the number of machine tools is small or where different cutting fluids are used.
Coolant centralized filtration system
The centralized coolant filtration system provides centralized supply and treatment of grinding fluids in the production workshop. It enables centralized filtration, oil removal, oxygen enrichment, and sterilization of the coolant, allowing precise control over its concentration, pH value, and bacterial count. This ensures that the coolant remains free from deterioration and significantly extends its service life.
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