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Oil and gas smoothing skills in the use of colored occupations
Source: China Bearing Network Time: 2018-06-16
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First, the strengths of oil and gas smooth skills
1. The bearing bearing can be improved from the meaning of smoothness; viscosity is the most important physical function of the smoothing agent; it directly affects the thickness of the oil film formed on the smooth surface. In heavy-duty bearings; usually it has a higher kinematic viscosity. Smooth oil is smoothed.
The habit of oil and gas smoothness on the viscosity of smooth oil is very wide; it can be from 0. 02×10-3mm2/s to 0.75×10-3mm2/s. It has been used in oil mist smoothing methods; it is only used to lower viscosity ( 0. 02 × 10-3mm2 / s or less) smooth oil.
Another common smoothing method is grease smoothness; perhaps many people will misunderstand because of the appearance; think that grease is a smooth oil with very high viscosity. In fact, oil is made from base oil, additives and thickeners or soap bases. A solid or semi-solid thick smoothing agent. The smoothness of the grease depends on the smoothness of the smooth oil contained in the grease; while the thickener or soap base can be regarded as a sponge; its function is to adsorb the smooth oil. Yuelu Tu Cixi (15) is forced to lick the edge and the viscosity of the smooth oil in the oil; in fact, most of it is lower than 0.15×10-3mm2/s.
On the other hand, Harbin Engineering University, which carried out the early research on the cooling and smoothing of gas-liquid two-phase fluids in China, passed the experimental research and thought; in the gas-liquid two-phase flow; the liquid and the gas firmly formed the gas-liquid "two-phase film". The gas-liquid "two-phase film" is compared with the single-phase liquid film; its viscosity is greatly improved.
2, the working speed of the progressive bearing oil and gas smooth can be a suitable kind of smooth oil and the "gas-liquid two-phase flow" composed of filtered compressed air is sprayed to the smooth zone at a higher speed; in the high-speed operation of the bearing conflict surface energy It is useful to constitute a gas-liquid "two-phase film" with a certain bearing capacity; the gas-liquid "two-phase film" has a two-layer action of hydrodynamic pressure and hydrostatic pressure. Therefore, the conflict appearance is always in an outstanding working state. This is unmatched by a single-phase "fluid film" consisting solely of fluid dynamic pressure. Because the gas-liquid two-phase mixed fluid with smooth oil and gas contains many gases and a small amount of smooth oil; thus, under high-speed working conditions; The temperature rise is low. Because "gas-liquid two-phase flow" can take away a lot of heat in time; so it also has outstanding cooling and cooling effect.
Tests by the bearing manufacturer SKF have proved that the smooth oil and gas is suitable for the bearing; without changing any mechanical structure; the single row cylindrical rolling bearing can greatly improve its limit speed. The current disclosure reports that the ndm value can reach 2000000 (ndm) = bearing speed (r / min) × bearing diameter (mm)).
Therefore, the gas-liquid two-phase fluid is selected to be smooth in oil and gas; it has more and more speed customary scale than any smooth method.
3, the progress of the bearing on the harsh working environment can be about the smooth oil and gas; smooth area filled with compressed air; constitutes a positive pressure (0. 02 ~ 0. 08MPa; depending on the sealing function); can avoid dust well The immersion of water, dirt, etc.; plays a "sealing" role; greatly reduces the damage caused by the external pollution of the bearing; therefore, it is uniquely suitable for use in severe working conditions; the operational reliability of the bearing has been significantly improved.
4, the use of progressive bearing life bearing oil and gas smooth; related to the selection of other smooth methods; the oil film breaks the probability of a dry conflict; the bearing temperature rise during operation; because of the external damage caused by accidental damage several degrees. The life of the lower bearing has been greatly improved; the uniform application period can be improved by 3 to 6 times.
5, the cost of greatly reducing the smoothing agent theoretically; 100% of the smoothing agent in oil and gas smoothness is used; it is only used to form the oil film.
But the need to clarify is that; in the process of smoothing agent operation; gradually there will be physical and chemical changes; constitute the so-called "oil residue"; thus; the need for new smoothing agents to make up; and the old smoothing agent After being used, it will not be seen; it will be discharged from the collection hole that may be specifically depicted by the bearing gap.
The minimum fuel consumption formula (experience formula) supplied by bearing manufacturer SKF is:
Q=C×D×B in the Q-single shaft required for smooth oil; ml/h,
C-coefficient; about oil and gas smooth; C=0.00003~0.00005, about oil mist smooth; C=0.0005, about grease smooth; C=0.003,
D-bearing outer diameter; mm, B-bearing row width; mm. According to the above formula, it can be seen that the oil and gas smoothness is 1/10 of the smooth amount of oil mist; it is about 1/100 of the smooth amount of grease; so it can be greatly reduced The cost of the smoothing agent; it can also reduce the environmental pollution caused by smoothness.
Second, the oil and gas smooth in the non-ferrous occupations in the non-ferrous metal occupation of the various rolling mills on the work rolls, the center roller and the support roller; its bearing seat is characterized by a large load; in the past these parts are selected oil mist smooth. Follow the rolling The development of the equipment; the oil mist is more and more unable to serve.
1. Because the rolling speed is getting faster and faster today; the corresponding demand for smooth bearing is getting higher and higher; the smoothness of oil mist gradually shows that it is not suitable for high-speed bearings.
2, because the positive pressure in the bearing cavity. ã„” 0. 02MPa); not enough to resist the process rolling oil invading the inside of the bearing housing and damage the bearing.
3, followed by the continuous improvement of the demand for the appearance of the product; many of the misty oil particles that occur in the smoothness of the oil mist are increasingly incapable of being endured by users.
Another type of oil that is used when the oil mist is smooth is turned into a very small misty oil particle that is harmful to the human body and enters the surrounding air; it becomes an invisible killer of Ankang.
Because of the above factors; the smoothness of the oil mist can not be accustomed to the needs of skills development; thus the oil and gas smoothing skills can be agile in the non-ferrous profession.
Third, the verification of the role of oil and gas smoothing is based on the previous knowledge; the very small amount of oil supplied by the oil and gas is not enough to play an outstanding smoothing effect; everyone is always accustomed to think that the method of increasing the oil supply is reliable; The facts prove that this kind of worry is the remaining. According to the relationship between oil and gas smooth oil supply Q, bearing temperature T and conflict NR; oil supply, bearing temperature and conflict are not directly proportional; when oil supply When the amount increases to a certain extent; the bearing temperature shows a downward trend; in the middle of this temperature curve; the temperature value is the highest; because the oil supply amount at this moment is not enough to lower the temperature of the bearing, on the contrary; because the remaining liquid conflicts The heat is followed by the increase in oil supply; the bearing conflict is also increased; and the lowest point of the two curves is exactly the time when the oil supply is the smallest; this is also the best area for oil and gas smoothness. The oil quantity can reach the outstanding effect of lowering the bearing temperature and reducing the bearing conflict.
Aligned with this subject; we and some of the skilled personnel of Shanghai Ou Teng Engineering Skills Co., Ltd. have tested some bearings on the oil and gas smoothing system of the winding unit of Yunnan Xinmei Aluminum Co., Ltd.; the intention is to verify that under the condition of micro-supply; bearing can Whether it is in an outstanding working condition. The test uses the actual temperature rise value of the measuring bearing as the target of the bearing operation; every 10 to 20 minutes, the portable thermometer is used to record the temperature of a certain fixed point of the bearing of the online operation bearing. The bearing parameters tested were: 95/145×24; when the data was collected during practice, the speed was 800-2000 r/min.
According to the minimum fuel consumption formula supplied by the bearing manufacturer SKF (Q=C×D×B); the bearing parameters to be tested are substituted into the fuel consumption formula; and C=0.00005 is obtained; the minimum working oil quantity Q is obtained. =0.174mL/h. Calculate through a long time; obtain a series of test data; take the uniform value test data and the curve; that is, when the oil supply reaches the optimal area of ​​oil and gas; even if a small amount of smooth oil is used; It also can well reach the drop bearing temperature and reduce the bearing conflict.
In summary, the oil and gas smoothing skills can be selected; the fuel consumption can be reduced; the bearing temperature can be lowered; the bearing life can be extended; and the environment will not be polluted together; because of its advantages of simple operation, wide application scale and advanced skills; Smooth skills will gradually be known and endured by everyone.
Fourth, the latest research direction of oil and gas smoothing skills follows the development of data science; presents a new type of smooth data superfine metal powder. Compared with some experts, some skill researchers add ultrafine metal powder into the gas-liquid two-phase flow; The gas-liquid-solid three-phase fluid smoothing agent; exhibits a more superior smoothing function. Although there is no practice in practice, it can be foreseen; the gas-liquid-solid three-phase fluid smoothing skill is a further development of the smoothing skill of gas-liquid two-phase fluid. Has a good development vision.
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