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Bearing processing grinding fluid and super essential oil gather supply and gathering filtration process
Source: China Bearing Network Time: 2014-01-17
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When the grinding tool and the metal surface are ground and polished; there is a lot of conflict heat between the grinding tool and the workpiece; the partial temperature can be as high as several hundred degrees; and the touch surface between the grinding tool and the metal surface is often in an extreme pressure state during high-speed grinding. This requires the grinding fluid to have the following functions: 1) excellent smoothness and kneading, 2) excellent cleansing and cooling, 3) excellent corrosion resistance and rust resistance, 4) Also have low foam and antibacterial properties.
Grinding fluid plays an extremely important role in grinding; correct application of grinding fluid can improve process stability, improve workpiece quality, and extend tool life. Compared with other machining processes; the primary feature of grinding is grinding wheel and The touch area of ​​the workpiece is large; the conflict between the abrasive particles and the appearance of the workpiece is high; the grinding arc is difficult to supply liquid; then the appearance of the workpiece is easily damaged by heat; the grinding wheel is subjected to the rated load and the wear is aggravated. It is usually thought that the grinding fluid has smoothness and cooling. , cleaning, rust and other effects.
Grinding fluid induction skill function quality can be divided into three categories: processing characteristics, its own quality function and environmental adaptability. Processing characteristics mainly refer to the cooling, smoothing, cleaning function of the grinding fluid in the process of processing and the integrity of the workpiece, things The impact of durability, etc., its quality function mainly refers to the physical and chemical functions of the grinding fluid. Environmental adaptability refers to the odor, toxicity, biological oxygen demand (BOD) and chemical oxygen demand (COD) of the grinding fluid. Environmental impact.
Grinding is the final process of ferrule machining, which has a direct impact on the accuracy, function and service life of the bearing products. In the process of machining, the coolant is used to avoid burns on the workpiece, improve the accuracy and roughness of the workpiece, and improve the workpiece and machine tool. Anti-rust ability, extended tool and machine tool life has a very important role.
If the coolant is supplied separately, the concentration, pH value and the number of colonies in the coolant are difficult to control, and the liquid supply system that is equipped alone is mostly rough, and the coolant is not changed, even if the mass is not changed. The chips and the grinding wheel ash will also fill the water tank very quickly, so that the coolant will rot and mutt during the application process, and the equipment will be damaged. It is difficult to ensure the quality of the processed parts. The coolant is often replaced, which reduces the production power and brings heavy fatigue to the workers. Together, they also increase the cost of production, and these replaced coolants are usually discharged without disposal, which has a great impact on the environment. In addition, because the coolant supply system is built by the equipment, usually In the production workshop, the transpiration and leakage of the coolant will also pollute the environment of the production workshop, directly affecting the well-being of the workers.
2. Grinding fluid gathering supply and filtration system for large and medium-sized mechanical processing plants; where possible; should consider the use of the collecting cycle system to supply cutting fluid for multiple machines; but it is necessary to use the same cutting fluid for each Several grinding machines can handle the grinding debris with a combined transport system; collect the fine chips and wear debris that are wet by the cutting fluid; reduce manpower disposal; improve working conditions.
The grinding fluid gathering system allows the factory to better protect the grinding fluid. The grinding fluid is collected in a large pool; it is periodically sampled; the raw liquid or water is compensated according to the results of the inspection; and the concentration of the grinding fluid is easy to handle; Ability to reduce the number of sample views; then perform more intent viewing; ensure the quality of the grinding fluid during the application period. Compare with many separate multi-grinding fluid supply systems separately; because the grinding fluid protection work is reduced; Also relatively falling.
The most important advantage of the collection supply system is that it can be removed by centrifugation to remove the oil and metal particles from the grinding fluid; together with half of the bacteria in the grinding fluid (because the bacteria are very simple in the grinding fluid) The interface between the floating oil and the metal particles grows.) Remove the dirt in succession; check the quality regularly and check the results according to these; plan to use the additive or participate in the stock solution; this is to make the gathering system very useful to extend the cutting fluid The important factor in the application of life. This also cuts the disposal of water-soluble grinding fluid waste.
The coolant collection system is used to collect and supply the grinding fluid in the production workshop; it has significant advantages compared with the single-machine sole-cooled liquid supply system. It can carry out the coolant. Concentrate filtration, degreasing, aeration, sterilization; complete control of its concentration, pH and number of colonies; then ensure that the coolant does not attack; extend the life of the coolant. Concentrate filtration of the coolant; The production cost is reduced; the labor intensity of the workers is reduced; the working environment of the workshop is improved; the environmental pollution is reduced together; the collection and disposal of the waste coolant can be completed; and then the environmental pollution is further reduced. Importantly, the cooling liquid is collected. The filtration system stabilizes the quality of the coolant for a long time; it ensures the demand for grinding of the bearing ring.
3. Super essential oil collection filter system Super essential oil filtration system consists of super essential oil filter and filter aid coating machine plus oil tank and pipeline valve. Mixing diatomaceous earth and clean oil before starting the filtration; After the mixing is completed; the liquid is transported by the pump on the coating machine to the filter for pre-coating of the filter layer; the pre-coating amount of diatomaceous earth is 0.5 to 1 kg/m 2 ; The concentration of the coating liquid is 0.3 to 0.6%; the circulating speed of the precoating liquid is 0.15 to 5 cubic meters per hour square meter. When the outer surface of the filter cloth is coated with a proper thickness (1.5 to 2 mm) of diatomaceous earth layer Ultra-precision oil filtration accuracy of 2 ~ 5μm. Currently in the ultra-essential oil filtration; the system is more ambitious in terms of operating costs and filtration. Super-fine oil filter because the filter plate and filter media are horizontally placed; The filter layer is uniform; it can be intermittently filtered without pressure and will not damage the pre-coating.
Usually, the bearing processing machine can be attached with a separate filtering system when it leaves the factory; however, the filtering system has low filtering precision; it can only satisfy the demand for low-precision bearing production; it cannot meet the demand for high-precision, low-noise bearing. In the case of a large number of machine tools The ultra-essential oil filtration system that uses this set of oil supply methods is an extremely ambitious plan; it can completely eliminate the filtration system of the original machine tool when acquiring the new machine tool and transforming the original filtration system; the cost performance is obvious. The actual situation; the plan needs to be able to make alignment corrections.
4. Investment, income analysis and implementation advocates to collect grinding fluid; can improve cooling and anti-rust function; extend the use time of grinding fluid, improve the precision of bearing ring ultra-precision, protect the environment, produce health; make the wheel ash get the disposal .
Gathering grinding fluid; filter or other methods of filtration; filtration accuracy ≤ 20um; filtration flow: 3000L / min, collecting super essential oil; filter or other methods of filtration; filtration accuracy ≤ 10um; filtration flow: 800L /min.
Practice has proved that the use of coolant collection filter system in the field of bearing grinding, the quality control of the product, the environmental requirements of the working environment and the best cost performance of the product, is a sophisticated and reliable method. Dealing with, bringing great economic benefits to the company, will also bring out outstanding social benefits.
The grinding process requires the use of grinding fluids; once every grinding machine used 0.5 cubic meters of water per day; then it was completely renewed; on the one hand, it was a great waste of water resources; on the other hand, wastewater constituted environmental pollution; It uses the water supply circulation room; it supplies water to each machine through the pipeline; the equipment can be used for 3 years per water supply. This reduces labor intensity, pollution reduction and water conservation.
The grinding fluid collection system can not exceed 500,000 yuan in one-time investment; it can dispose 50 grinding water supply; the investment cost of equipment can be recovered within 3 years.
Before using the super-essential oil to collect the filtration system; the super-essential oil is replaced once by the oil in one month; the application amount reaches 200 kg/month; after use, it is treated as waste oil. After the super-essential oil is used to collect the filtration system; the current is 5 tons of oil pool; Only 5 tons of oil can be used for 20-30 machines per year.
The collection and filtration system of grinding fluid and super essential oil has great implementation value; one-time investment is not large; but the resource saving effect is significant; the social effect is good; the demand for plant transformation is not high. [MechNet]
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