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Selection of centralized filtration and supply plan for grinding fluid in bearing processing

Source: FAG bearings  Tags: News

When the workpiece is being ground, high temperature is formed in the grinding area, which will wear the grinding wheel, deteriorate the surface integrity of the parts, and the machining accuracy of the parts is difficult to control. Therefore, the grinding fluid must be injected into the grinding area to reduce the grinding temperature. Grinding fluid not only has lubrication and cooling effects, but also has washing and anti-rust effects. The correct use of grinding fluid can prevent workpiece burns, improve the surface accuracy and roughness of workpieces, improve the rust-proof ability of workpieces and machine tools, and extend the service life of tools and machine tools. Therefore, rational use and maintenance of grinding fluid is crucial in the bearing processing process important.

If the grinding fluid is supplied separately, it is difficult to control its concentration, pH value and the number of colonies in the cooling fluid; and the separately equipped fluid supply system is mostly relatively simple, regardless of the season, even if the quality of the grinding fluid has not changed, a large amount Iron filings and grinding wheel dust will also fill the water tank quickly, causing the grinding fluid to rot and deteriorate during use, damage the equipment, and it is difficult to ensure the quality of the processed parts. Frequent replacement of the coolant not only reduces the production efficiency, but also brings heavy fatigue to the workers, but also increases the production cost; and these replaced coolants are generally discharged without treatment, which has a great impact on the environment. In addition, since the grinding fluid supply system comes with the equipment, it is generally in the production workshop. The evaporation of the grinding fluid will produce pungent odor gases that directly affect the health of workers, and the leakage of the grinding fluid will also affect the production. The environment of the workshop caused pollution. Using the coolant centralized filtering system to centrally supply and filter the grinding fluid in the production workshop has obvious advantages compared with the coolant supply system that is equipped with a single machine and is separately supplied. It can perform centralized filtration, degreasing, oxygenation, and sterilization of the coolant, and realize the control of its concentration, pH value and colony count, so as to ensure that the coolant does not deteriorate and prolong the service life of the coolant. The centralized filtration and recycling of coolant can reduce production costs, reduce labor intensity, improve the working environment of the workshop, and reduce environmental pollution. At the same time, it can also realize the centralized treatment of waste coolant, thereby further reducing environmental pollution. The important thing is that the coolant centralized filtering system makes the coolant quality stable for a long time and ensures the needs of bearing grinding processing. For large and medium-sized machinery processing plants, where possible, a centralized circulation system should be considered to supply grinding fluid to multiple machine tools, but each machine must use the same grinding fluid. SKF 23060 CC/W33 bearings online , today share packing photos :

Grinding fluid centralized filtration equipment mainly has many forms, including negative pressure filter and positive pressure filter. The two filters are described and compared below. The working principle of the negative pressure filter is that there is a sealed cavity under the filter cloth of the filter, and a certain degree of vacuum is formed under the suction action of the water pump. The grinding fluid on the filter cloth enters through the filter cloth under atmospheric pressure and gravity. Seal the cavity, leaving the grinding residue on the filter cloth. When the grinding residue on the filter cloth increases, the resistance of the grinding fluid through the filter cloth increases, the filtration rate decreases, and the filter residue layer becomes thicker, and the gap between the filter residues is reduced. The accuracy is increased. While improving the filtration accuracy, the resistance of the liquid flow will increase, and the vacuum degree of the clean liquid tank will increase. When the vacuum reaches a predetermined value, the valve opens, the filter cloth moves, and the filter residue is taken out, and the clean filter cloth at the back enters the filter position to continue filtering. The working principle of the positive pressure filter is to create a pressure-resistant sealed cavity above the filter cloth. When working, the grinding fluid enters the sealed cavity above the filter cloth through the pipe at a certain pressure, and the particulate impurities in the dirty floating liquid are intercepted by the filter paper and filtered After the net liquid is collected in the net liquid tank, when the filter paper is used for a period of time, the passing capacity of the floating liquid decreases, and when the internal pressure rises to a certain set value, the system will automatically cut off the entry of the grinding liquid and pass through the compressed air cylinder Pressurize to drive off the grinding fluid on the filter cloth and press dry the filter residue. After a set period of time, the sealed cavity opens, the filter cloth moves horizontally, and the clean filter cloth is input, and the filter residue is discharged at the same time. Finally, the sealed cavity is closed. Start the next cycle. The common point of the two is that they both use filter cloth to filter, and the filtering accuracy is similar. The difference is that the way of pressure is different when filtering. The key to these two filtering methods is to truly form a sealed cavity. If the sealed cavity of the negative pressure filter leaks, the vacuum cannot be formed and no negative pressure is generated. At this time, the filtration will become completely dependent on gravity. Filtering, the filtering flow will be greatly reduced, which cannot meet the amount of grinding fluid required for production. If the seal between the filter cloth of the positive pressure filter and the sealed cavity is not good, the grinding fluid will directly enter the net without filtering. The liquid tank cannot meet the quality requirements of the grinding fluid required for production, which will affect the product quality. Since the pressure difference of the positive pressure filtration method is larger than that of the negative pressure filtration method, when the filtration area is the same, the filtration flow is relatively large, and the filtered residue is relatively dry, low in water content, easy to handle, and reduces grinding The loss of cutting fluid avoids secondary pollution, and the precision of fluid discharge is less than 10um.

In the bearing processing, the grinding fluid concentrated filtering form and the selection of the filter are related to many factors. Each arrangement has its own advantages and unavoidable disadvantages. It is impossible to qualitatively infer which method is the best. It can be a specific analysis of a specific project, and the most appropriate method is selected after comprehensive comparison.