What principles should be taken into account when choosing a grease?

Attention should be paid to the selection of grease: quality requirements: the purpose of lubrication is to reduce friction and wear.

Oil lubrication can also take away the heat generated by friction, thereby reducing the temperature of the friction surface and acting as a cooler. Therefore, it is necessary to select lubricating grease with different quality requirements according to the operating conditions of the machinery and equipment. For example, for gasoline engines with different compression ratios, gasoline oils of the appropriate quality grade should be used.

It is precisely because of the change of gasoline engine that the upgrading of gasoline engine oil has been driven. When choosing a lubricant for mechanical components, the lubrication system needs to be considered at the same time. In particular, the circulating lubrication system requires the selection of lubricating oil with excellent oxidative stability and demulsibility resistance to ensure its service life, and easy separation of moisture and removal of mechanical impurities.

Lubrication requirements: When the automobile engine is running, due to the easy production of sludge, coking and carbon deposits in the friction parts, additives such as cleaning dispersants must be added to the engine, and the cleaning dispersants are the main ones. The circulating lubrication system of industrial machinery and equipment is required to be able to quickly separate water molecules and sedimented impurities, so it is not suitable to add cleaning and dispersing agents to industrial lubricating oil.

The main role of grease is to lubricate, protect and seal.

The vast majority of greases are used for lubrication and are called anti-friction greases. Anti-friction grease mainly plays the role of reducing mechanical friction and preventing mechanical wear, and also plays a protective role in preventing metal corrosion and sealing and dustproofing. There are some greases that are mainly used to prevent metal from rusting or corroding, known as protective greases.

For example, there are a few greases such as industrial petroleum jelly that are specially used for sealing, which are called sealing greases, such as thread grease. Greases are mostly semi-solid substances with unique fluidity.

1) The selected grease should be suitable for the grease supply method of the friction pair.

When it is a centralized grease supply, 00 No. 1 grease should be selected; For parts that are regularly filled with grease such as grease guns and grease cups, No. 1 and No. 3 grease should be selected; For long-term use without changing grease, No. 2 or No. 3 grease should be used.

2) The selected grease should be suitable for the working state of the friction pair.

For example, when the vibration is large, the grease with high viscosity, good adhesion and vibration damping properties should be applied, such as a composite soap grease thickened with a high-viscosity naphthenic or mixed-based lubricating oil.

3) The selected grease should be suitable for its purpose of use.

The grease for lubrication must be selected according to the type, working conditions, working conditions, environmental conditions and grease supply methods of the friction pair. For the protective grease, it should be able to effectively protect the metal from corrosion, such as protecting the parts in contact with seawater and water, and the aluminum-based grease with strong adhesion ability and high water resistance should be selected; For general protective greases, greases made from solid hydrocarbon-thickened high-viscosity base oils can be used. For sealing greases, attention should be paid to their resistance to the solvent of the sealed medium.

4) The selected grease should be as much as possible to ensure that the variety of grease is reduced to improve economic benefits.

In the case of meeting the requirements, try to choose lithium grease, compound soap grease, polyurea grease and other multi-effect general grease. In this way, the variety of lipids is reduced, the management of fats is simplified, and the cost of lipids and maintenance costs can be reduced due to the long service life of multi-effect lipids.

Grease is made of base oil, thickener and additives, and the performance of different types and different grades of the same type of grease varies greatly, and the permissible rotation limit is different, so it is important to pay attention when choosing. The performance of a grease is mainly determined by the base oil. Generally, low-viscosity base oils are suitable for low temperature and high speed; High viscosity is suitable for high temperatures and high loads.

The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. As a general rule, greases of different brands should not be mixed, and even greases with the same thickener can have a negative effect on each other due to different additives. The viscosity of the lubricating oil is the basic factor in the formation of the lubricating oil film.

In the working conditions of medium speed, medium load and temperature are not too high, medium viscosity lubricating oil is selected. In the case of heavy loads, low speeds and high temperatures, use high-viscosity lubricants or lubricants with extreme pressure anti-wear agents. Under low load, high speed and low temperature, low-viscosity lubricating oil is selected.

The higher the working environment temperature, the higher the viscosity of the lubricating oil;

The larger the working load, the higher the viscosity of the lubricating oil to ensure that the oil film has sufficient strength;

The smaller the gap between the friction surfaces, the lower the viscosity of the lubricating oil to ensure that enough oil flows between the two friction surfaces;

Between the perpendicular friction surfaces, the viscosity of the lubricating oil should be higher to reduce the loss of oil flow.

Introduction to lubricants

Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and processed parts, mainly playing the functions of lubrication, cooling, rust prevention, cleaning and foundation, sealing and buffering.

Classification and use of industrial lubricants.

1.anti-wear hydraulic fluid; Anti-wear hydraulic oil is generally used in the hydraulic system of construction machinery and die-casting machine, construction, hardware, plastics, machine tools and other medium and high hydraulic systems and some gearboxes, bearing lubrication systems and other special anti-wear and anti-oxidation lubrication systems.

2.air compressor oil; Air compressor oil is used in a variety of domestic or imported air compressors.

3.industrial gear oils; Industrial gear lubricants are used for the lubrication of gear transmissions with a wide range of loads.

4.machine tool spindle oil; Guide rail oil and spindle oil are suitable for the lubrication of spindles, guide rails and other parts of various mechanical equipment such as modern CNC machining centers, grinding machines, lathes, planers, drilling machines, etc.

5.Vacuum pump oil is used for lubrication of various mechanical vacuum pumps.

6.heat transfer fluids; Heat conduction oil is suitable for the chemical, food, pesticide, textile, printing and dyeing, coking, paint, ink, rubber industry oil boiler, oil bath furnace, oven heat setting and distillation, melting fractionation, reactor heating process in the need of liquid phase heat conduction source.

7.There are also specialty industrial oils; High-temperature chain oil is suitable for the lubrication of transmission chains such as spraying, paint baking workshop, reflow soldering machine, wave soldering machine, heat setting machine, etc.; Quenching oil is used in the quenching process of various metal materials.

From the perspective of automotive lubricant demand, the number of civilian vehicles has increased year by year, stabilizing the demand for automotive oil.

I have helped you find the results; The selection principles of lubricating oil Xinbi old grease mainly include: according to the working conditions and use requirements of mechanical equipment, determine the viscosity, viscosity index, oxidation stability, wear resistance and other performance requirements of lubricating grease; According to the material and working environment of the mechanical equipment, select the appropriate type of lubricating grease, such as high temperature, low temperature, food wisdom group grade, etc.; Choose the right grease brand and quality grade based on the service life and maintenance cost of your machinery and equipment. Reminder:

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Dear, hello delicate and coarse, the selection principle of lubricating grease is:1Select lubricating grease according to the requirements of the machine and equipment:

When the machine is designed, the manufacturer will clearly specify what kind of lubricating grease needs to be used, including the model and grade. Therefore, when purchasing lubricating grease, it is necessary to understand the requirements of machinery and equipment. 2.

Understand the performance characteristics of lubricating grease: Different lubricating greases have different performance characteristics, such as viscosity, oxidation stability, extreme pressure, rust resistance, wear resistance, etc. When selecting lubricating grease, it is necessary to determine the required performance characteristics according to the working conditions and working environment of the machine and equipment.

3.Choose lubricating grease according to the conditions of use: In the use of machinery and equipment, the limbs of the stool will change due to factors such as working environment and temperature, so the use conditions need to be considered when choosing lubricating grease.

4.Pay attention to the quality and storage conditions of lubricating grease: the quality and storage conditions of lubricating oil directly affect its use effect.

Therefore, when choosing lubricating grease, it is necessary to choose products from regular channels and pay attention to storage conditions. In short, when choosing lubricating grease, it is necessary to comprehensively consider the requirements of machinery and equipment, the performance characteristics of lubricating grease, the use conditions and quality to ensure the normal operation of machinery and equipment and extend its life.

The principle of the selection of lubricating oil is the selection of viscosity, in different working environments, then the viscosity of the selected lubricating oil is also different, and the different working environments are generally divided into four types, that is to say, there will generally be four options in the case. So what is the lubricating oil used in these different working environments, interested partners can continue to read and understand.

1. Generally speaking, if the working environment is not very high in terms of speed, medium load and temperature, then the lubricating oil selected is the medium viscosity lubricating oil.

2. If it is in the case of high load, low speed and high temperature working environment, then the lubricating oil selected is a high-viscosity lubricating oil or a lubricating oil with extreme pressure anti-wear agent.

3. If it is in the case of low load, high speed and low temperature working environment, then the lubricating oil selected is the lubricating oil with low viscosity and sailing.

4. If the width and height and temperature are relatively low, as well as light load and high speed, and there are other special requirements of the working environment, then the selected lubricating oil is a synthetic lubricating oil.

There are four principles for the selection of lubricating oil, first: the higher the temperature of the working environment, the higher the viscosity of the lubricating oil. Two:

The greater the load when working, the higher the viscosity of the lubricating oil. Three: the smaller the gap between the friction and hail on the surface, the lower the viscosity of the lubricating oil.

Four: If it is between the surfaces of vertical friction, then the viscosity of the lubricating oil will be higher.

1. If the fluidity of the polymer can meet the needs of the molding process, the main consideration is whether the external lubricant meets the process requirements and whether it is convenient for demoulding to ensure the balance between inside and outside.

2. Whether the external lubrication is ideal should be seen whether it can form a complete liquid film on the plastic surface during molding. Therefore, the melting point of the external lubricant should be close to the molding temperature, but it should be noted that there is a difference of 10-30 so that a complete film can be formed.

3. The compatibility with the polymer is moderate, the internal and external lubrication is balanced, no frosting, and it is not easy to scale.

4. The heat resistance and chemical stability of the lubricant are excellent, and it does not decompose in processing, does not volatile, does not corrode equipment, does not pollute products, and has no toxicity.

When using lubricating oil, it should be determined according to the actual use of machinery and equipment. If the provisions of the lubrication specification in the manual of the machinery and equipment are the basis for the selection of oil products for the machinery and equipment; If there is no manual or regulation, the equipment user shall choose by itself. Then according to the general practice of the industry, the following principles should be followed when choosing oil products:

First: the speed of movement of mechanical equipment.

When running at high speeds, the higher the speed, the easier it is to form oil wedges, and low viscosity lubricating oil can be used to ensure the presence of oil film, such as: Mobil DE24 anti-wear hydraulic fluid. If the viscosity is too high, the impedance will be large, the heat generated by the mechanical equipment will be large, and the unsafe factors such as excessive temperature will damage the mechanical equipment.

When operating at low speeds, machinery and equipment mainly rely on the viscosity of the oil to carry the load, and a lubricating oil with higher viscosity should be selected, such as Mobil 600XP680 gear oil.

Second: carrying loads.

Generally speaking, the higher the load of mechanical equipment, the higher the viscosity of the lubricating oil. Low-speed heavy loads should consider the allowable carrying capacity of the oil, and should be within the range of its carrying capacity, and try to use high-viscosity oils, such as Mobil DTE heavy duty circulating oil.

Third: operating temperature.

When many mechanical equipment are running, the temperature changes are relatively large, at this time we should choose oil products with high viscosity index, and oil products with high viscosity and flash point, good oiliness and oxidation stability, and corresponding additives should be used for working under high temperature conditions. For example, low-temperature resistant oils with low viscosity, less moisture and low freezing point should be used for working at low temperatures, such as Mobilith SHC100 high temperature grease.

Fourth: the working environment.

a.In humid environments and aerosol environments, oil products with strong emulsification resistance, oiliness and rust resistance should be selected.

b.In dusty environments, attention should be paid to dust-proof sealing.

c.In the environment with corrosive gases, oil with good corrosion resistance should be selected.

Therefore, Mobilrama 245 anti-rust oil can be selected for this type of oil.

To sum up: when choosing lubricating oil for mechanical equipment, we should always pay attention to it, otherwise, it is likely to cause unnecessary waste and even cause major safety accidents.

The key to choosing an industrial lubricant is to consider the performance of the industrial lubricant according to the condition of the mechanical equipment, that is, the working load, speed, temperature and environmental conditions of the mechanical equipment. The matching industrial lubricating oil has also become the key to the operation of each plant, and Jiaoda Derun lubricating oil recommends the following points for you: 1. The working load of mechanical equipment 2, the temperature of mechanical equipment 3, the environment of mechanical equipment 4, and the speed of movement of mechanical equipment.

The industrial lubricants of Jiaoda Derun have been widely used in various industries such as machinery, metallurgy, coal mining, light industry, electric power, and transportation. The whole series of products use the world's leading scientific research technology, relying on Xi'an Jiaotong University in machinery manufacturing, high-speed cutting, high-end machine tools, rotor bearing systems and other high-end manufacturing equipment in the field of engineering tribology research, lubrication theory research, lubrication status monitoring, lubricating oil detection and analysis, lubrication design and efficiency, micro and nano oil film research, mixed lubrication condition research, multi-lubrication state research, health maintenance, operation safety and other aspects of scientific research achievements, relying on Xi'an Jiaotong University talents, technology, scientific research has great advantages.