阅读说明：本技术 一种乏油工况下纳米润滑高速滚动轴承抗磨延寿方法 (Method for prolonging service life of nano-lubricating high-speed rolling bearing under oil-lacking working condition in wear-resisting manner ) 是由 李军宁 唐晓婕 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种乏油工况下纳米润滑高速滚动轴承抗磨延寿方法,包括以下步骤：步骤一：纳米润滑混合油液制备；步骤二：基于蠕动泵定量供油系统的实验系统改进；步骤三：乏油工况纳米润滑滚动轴承实验方案设计；步骤四：纳米润滑混合油液作用下滚动轴承抗磨延寿实验研究。本发明通过提出乏油状态判据并将其应用到实验研究方面,获得高性能滚动轴承抗磨增寿方案,可为高速滚动轴承服役性能的提升提供重要参考。(The invention relates to a wear-resistant life-prolonging method for a nano-lubricating high-speed rolling bearing under the oil-lacking working condition, which comprises the following steps: the method comprises the following steps: preparing nano lubricating mixed oil; step two: an experimental system improvement based on a peristaltic pump quantitative oil supply system; step three: designing an experimental scheme of a nano lubricating rolling bearing under the oil-lacking working condition; step four: and (3) experimental research on the wear resistance and the service life of the rolling bearing under the action of the nano lubricating mixed oil. According to the invention, the wear-resistant life-prolonging scheme of the high-performance rolling bearing is obtained by providing the spent oil state criterion and applying the spent oil state criterion to the aspect of experimental research, and an important reference can be provided for the improvement of the service performance of the high-speed rolling bearing.)

1. A wear-resistant life-prolonging method for a nano-lubricating high-speed rolling bearing under the oil-lacking working condition is characterized by comprising the following steps:

the mass flow of the nanometer lubricating mixed liquid carried on the two surfaces of the rolling bearing contact area is as follows:

m_x＝ρ(h_au₁+h_bu₂)

where ρ is the lubricant density, h_a、h_bThe thickness u of the oil layer on the two surfaces of the elastic flow contact zone₁、u₂The average speed of the surface of a contact point between the inner ring raceway and the roller;

converting mass flow to volume flow as:

in the formula, m_xRho is the mass flow rate, and is the density of the lubricating oil;

the line contact isothermal elastohydrodynamic lubrication is as follows:

wherein p is pressure, h is film thickness, and eta and rho are viscosity and density of the lubricating oil respectively;

under the oil-lacking working condition, the flow of the nano lubricating mixed liquid is combined with the line-contact isothermal elastohydrodynamic lubrication, an analysis model of the oil film thickness and the oil film pressure of the rolling bearing contact area is established, and the change rule of the oil film thickness h of the rolling bearing contact area under the action of different working conditions and volume flow parameters is analyzed;

when the thickness of the oil film is reduced to the state that rough peaks on two surfaces of the friction pair are in direct contact, the lubrication failure is determined, and the film thickness ratio lambda is used as the judgment standard of the oil lacking state:

wherein h is the thickness of the lubricating oil film under different working conditions and oil supply amount obtained by an oil film thickness and oil film pressure analysis model, and R₁And R₂The roughness of the two surfaces of the friction pair respectively.

2. The method for resisting wear and prolonging the service life of the nano-lubricating high-speed rolling bearing under the oil-lacking working condition according to claim 1, wherein the nano-lubricating mixed solution comprises the following components in percentage by mass: 0.1 to 2.5 percent of silicon dioxide nano particles, and the balance of base oil.

3. The method for improving the wear resistance and the service life of the nano-lubricating high-speed rolling bearing under the oil-lacking working condition of claim 2, wherein Mobil DTE 24 is selected as the base oil, and the particle size of the silicon dioxide nanopowder is 50 nm.

4. The method for wear resistance and life extension of the nano-lubricating high-speed rolling bearing under the oil-lacking working condition according to claim 2, wherein the preparation method of the nano-lubricating mixed solution comprises the following steps: firstly, adding base oil into a reactor, and starting a stirrer; then adding the silicon dioxide nano particles into the base oil, and stirring for 5-10min to obtain the finished oil.

Technical Field

The invention belongs to the technical field of high-speed rolling bearings, and particularly relates to a wear-resistant life-prolonging method for a nano-lubricating high-speed rolling bearing under an oil-lacking condition.

Background

The high-performance rolling bearing is used as a key part of heavy equipment such as an aircraft engine, and the actual working performance of the whole machine is directly influenced by the performance of the high-performance rolling bearing. The rolling bearing faces the practical problems of wear failure and the like, and the conventional treatment method is generally as follows: if the normal fatigue failure indicates that the service life of the bearing can not meet the use requirement, the bearing with higher performance needs to be replaced; for corrosion-induced failures and the like, it is often necessary to exclude corrosion-inducing liquids or to improve sealing in the bearing; for failures caused by improper lubrication, the oil needs to be replaced.

The high-speed rolling bearing often faces the problems of slipping and wear failure under the oil-lacking working condition, and the common oil lubrication mode can cause the rolling bearing to generate serious wear.

Disclosure of Invention

The invention provides a method for prolonging the wear resistance of a nano-lubricating high-speed rolling bearing under the oil-lacking working condition, which solves the problems in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a wear-resistant life-prolonging method for a nano-lubricating high-speed rolling bearing under the condition of oil lacking comprises the following steps:

the mass flow of the nanometer lubricating mixed liquid carried on the two surfaces of the rolling bearing contact area is as follows:

m_x＝ρ(h_au₁+h_bu₂)

where ρ is the lubricant density, h_a、h_bThe thickness u of the oil layer on the two surfaces of the elastic flow contact zone₁、u₂The average speed of the surface of a contact point between the inner ring raceway and the roller;

converting mass flow to volume flow as:

in the formula, m_xRho is the mass flow rate, and is the density of the lubricating oil;

the line contact isothermal elastohydrodynamic lubrication is as follows:

wherein p is pressure, h is film thickness, and eta and rho are viscosity and density of the lubricating oil respectively;

under the oil-lacking working condition, the flow of the nano lubricating mixed liquid is combined with the line-contact isothermal elastohydrodynamic lubrication, an analysis model of the oil film thickness and the oil film pressure of the rolling bearing contact area is established, and the change rule of the oil film thickness h of the rolling bearing contact area under the action of different working conditions and volume flow parameters is analyzed;

when the thickness of the oil film is reduced to the state that rough peaks on two surfaces of the friction pair are in direct contact, the lubrication failure is determined, and the film thickness ratio lambda is used as the judgment standard of the oil lacking state:

wherein h is the thickness of the lubricating oil film under different working conditions and oil supply amount obtained by an oil film thickness and oil film pressure analysis model, and R₁And R₂The roughness of two surfaces of the friction pair respectively;

different lambda values are obtained by changing different working conditions and oil supply quantities, and further different lean oil states are corresponded.

Further, under a specific oil-lacking state, the rotating speed of the inner ring of the high-speed rolling bearing testing machine is adjusted, the working condition is set to be 0-9000 r/min for carrying out experiments, the friction coefficient, the abrasion loss and the temperature rise index of the high-speed rolling bearing testing machine are respectively obtained, the data are analyzed to obtain the friction abrasion time-varying rule of the high-speed rolling bearing testing machine, and then the abrasion reduction and life increase method of the high-speed rolling bearing under the oil-lacking condition is obtained.

Further, under a specific oil-lacking state, the radial load of the high-speed rolling bearing testing machine is adjusted, the working condition is set to be 0-9000N for experiment, and then an influence mechanism of different numerical values of single factors of the load on the change rules of the friction coefficient, the abrasion loss, the temperature and the like of the rolling bearing is obtained, and further the method for reducing the abrasion and prolonging the service life of the high-speed rolling bearing under the oil-lacking condition is obtained.

Further, the nanometer lubricating mixed liquid comprises the following components in percentage by mass: 0.1 to 2.5 percent of silicon dioxide nano particles, and the balance of base oil.

Further, Mobil DTE 24 is selected as base oil, and the particle size of the silicon dioxide nano powder is 50 nm.

Further, the preparation method of the nano lubricating mixed solution comprises the following steps: firstly, adding base oil into a reactor, and starting a stirrer; then adding the silicon dioxide nano particles into the base oil, and stirring for 5-10min to obtain the finished oil.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a wear-resistant life-prolonging method for a high-speed rolling bearing under an oil-deficient condition through nano lubricating mixed oil, discloses a friction and wear rule of the nano lubricating rolling bearing under the influence of multiple factors such as nano lubricants, oil-deficient states, operating conditions and the like, obtains a wear-resistant life-prolonging scheme for the high-performance rolling bearing, and is beneficial to the improvement of the service performance of the high-speed rolling bearing.

2. According to the invention, the silicon dioxide nanoparticles are added into the lubricating liquid, so that the lubricating liquid has excellent tribological properties, and simultaneously has the advantages of good controllability, good dispersibility and the like as a novel environment-friendly additive.

Drawings

FIG. 1 is a schematic view of an embodiment of a nano-lubricating mixed oil-lubricated rolling bearing of the present invention;

FIG. 2 is a schematic diagram of the wear change law of the nano lubricating mixed oil lubricating rolling bearing of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

the first part is preparation of nanometer lubricating mixed oil.

And in the second part, the experimental system improvement based on a peristaltic pump quantitative oil supply system.

And the third part is the design of an experimental scheme of a nano lubricating rolling bearing under the oil-lacking working condition.

And fourthly, experimental research on the anti-wear and life-prolonging of the rolling bearing under the action of the nano lubricating mixed oil.

In the first part of the embodiment, silica nanoparticles with the particle size of 50nm are preferably selected, 0.1-2.5% by mass of nano powder is added to be mixed with the Mobil DTE 24 base oil, and the mixture is continuously stirred for 5-10min by a stirrer to prepare nano lubricating mixed oil with different particle sizes and proportions. Meanwhile, pure oil with the same amount and without any nanoparticles is selected as an experimental control group.

In the second part of the embodiment, a peristaltic pump quantitative oil supply system is added into the high-speed rolling bearing testing machine, the original oil supply, oil inlet and oil return passage of the rolling bearing testing machine is closed, one end of the peristaltic pump is connected with the rolling bearing testing machine to supply oil to the bearing, and the other end of the peristaltic pump is communicated with a prepared nano lubricating mixed oil container to extract oil. The WG600F industrial intelligent peristaltic pump is preferably used for large-flow transmission and liquid split charging, and further achieves the basic functions of forward and backward movement, starting and stopping, flow regulation and the like.

The third part of this example is the design of the nano-lubricating rolling bearing experimental scheme. On the basis of the prepared nano-particle mixed oil, the relationship between the linear contact elastic flow and the lubricating flow is obtained by analyzing the lubricating property of the contact area of the roller inner ring of the rolling bearing. And improving a linear contact isothermal elastic flow typical calculation method by adopting a lubricating oil flow characterization model, and obtaining an analysis program suitable for the lubricating characteristics of the micro contact area of the high-speed rolling bearing by integrating an elastic flow calculation model and a volume flow calculation formula. And obtaining an oil film thickness distribution value and combining a film thickness ratio lambda formula to obtain a spent oil state judgment basis, and researching and disclosing an anti-wear life-prolonging scheme of the nano lubricating rolling bearing under the spent oil working condition.

The fourth part of the embodiment is the experimental research on the anti-wear and life-prolonging of the rolling bearing under the action of the nano lubricating mixed oil, the experiment is carried out, the influence mechanism of the change rule of the friction coefficient, the wear loss, the temperature and the like of the nano lubricating rolling bearing under the action of different lubricating oil quantities, rotating speeds, loads and other factors is obtained, the friction and wear mechanism of the rolling bearing under the action of the nano lubricating mixed oil with different particle sizes and proportions is revealed through analysis, and the anti-wear and life-prolonging mechanism and the solution of the high-speed rolling bearing under different working conditions are further obtained.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a schematic diagram of an embodiment of a nano-lubricating rolling bearing, in the scheme, configured nano-lubricating oil is independently conveyed to an experimental bearing through a peristaltic pump and an oil supply pipeline, and the flow of the lubricating oil is adjusted and changed through the peristaltic pump, so that the friction and wear rule and the friction reduction and service life prolonging mechanism research of the nano-lubricating rolling bearing under working conditions of different oil supply amounts, rotating speeds, loads and the like are realized.

Fig. 2 is a schematic diagram of the wear change rule of the nano-lubricating rolling bearing. The results show that the abrasion loss of the rolling bearing is continuously reduced along with the increase of the oil supply amount. Through comparing the pure oil operating mode, the bearing wearing capacity is littleer in the experiment that contains 50nm nanoparticle mixed lubrication fluid, demonstrates that 50nm granule and fluid mixing can play the effect that reduces the wearing and tearing to a certain extent. Meanwhile, the antifriction effect of the added nano-particle mixed oil liquid on the bearing in the oil lacking stage is found to be greater than that of the added nano-particle mixed oil liquid on the bearing in the full oil supply process.

The above are specific embodiments of the present invention, but the structural features of the present invention are not limited thereto, and the present invention can be applied to similar products, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the claims of the present invention.