The importance of using deep groove ball bearing grease for stability

1, anti-rust performance

The rust preventive agent is preferably insoluble in water, has good adhesion, and can form an oil film on the surface of the steel.

2, mechanical stability

If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3, oil seal

Oil seals are necessary to protect deep groove ball bearings and lubricants from external contamination. During the operation of TIMKEN bearings, no matter whether debris or moisture can penetrate into TIMKEN bearings to prevent damage.

4, mixed grease

Do not mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the TIMKEN bearing may be damaged due to the easy loss of grease.

5, the classification of oil

The consistency and lubricity of grease are affected by the operating temperature. TIMKEN bearings operating at a certain temperature must select greases with the correct consistency and good lubrication at the same temperature.

In general, the amount of grease filled in deep groove ball bearings always exceeds the actual required amount of direct participation in lubrication, in the cavity on the frame and in the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of the excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be carried by the rolling element into the raceway. In the early stages of the bearing, most of the grease is squeezed out of the raceway very quickly (less than a minute), and the build-up grease is discharged a small amount while circulating along with the bearing rotor. At this time, the bearing temperature continues to rise until the excess bearing grease is completely discharged, which can be called the running phase of the grease. According to the grease quality and filling amount in the TIMKEN bearing structure, this time may last for more than ten. Minutes, even hours.

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Analysis of the Influence of Grease Viscosity on IKO Rolling Mill Bearings

The measure of internal friction during material activity is called viscosity. In order to prevent the contact surface between moving parts, the bearing lubricant must have sufficient viscosity, and the viscosity value decreases with increasing temperature. Viscosity is an important physical and chemical performance index for evaluating the quality of IKO bearing lubricants. It is of great significance for production, transportation and use.

Viscosity is the main technical index of bearing lubricants, but the viscosity of IKO bearing lubricants should not be higher than the degree that affects the start of the engine. Most bearing lubricants are classified according to their viscosity, and the viscosity is the oil of various equipment. mostly according. The measurement of viscosity is divided into two categories: absolute viscosity and relative viscosity. Absolute viscosity is divided into dynamic viscosity and kinematic viscosity; relative viscosity has several expressions such as Enshi viscosity, Sai's viscosity and Rayleigh viscosity.

The use of excessively large rolling mill bearing lubricants will increase the wear of the machine. In practical applications, the selection of lubricants of suitable viscosity will ensure that the mechanical equipment works normally and reliably. Generally, for low-speed and high-load applications, oils with higher viscosity are selected to ensure sufficient oil film thickness and normal lubrication. For high-speed and low-load applications, oils with lower viscosity are selected to ensure the normal starting of mechanical equipment. The running torque, the lubricating oil of the engine is too large, the activity is slow, the upstream is slow, and the oil pressure is high, but the lubricating oil passes through a small amount, and cannot be added to the friction surface in time, and the friction generated under the condition of continuous operation is the smallest.

Because the rolling speed of the rolling mill bearing oil is slow, the number of passes through the bearing lubricating oil filter is small, and it is difficult to clean the worn metal chips, carbon particles and dust from the friction surface in time. In operation, because the viscosity of the lubricating oil is large, the friction between the friction surfaces of the parts increases, and in order to overcome the increased friction, the fuel is consumed more, and the output power of the engine is also reduced. IKO bearing lubricants have high viscosity, and the oil's cycle speed is slow. The cooling and heat dissipation effects are poor, which makes the engine overheat. The temperature rise is small so that an oil film can be formed between the moving parts at various operating temperatures.

Therefore, do not use excessively strong engine oil, let alone think that the viscosity is as high as possible. Under the premise of ensuring lubrication, depending on the temperature range at the time of use, use a lubricant with a small viscosity as much as possible. However, for the engine that has been worn to a serious degree and the gap has been relatively large, a lubricant having a slightly higher viscosity can be appropriately selected.

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Standard method and lubrication maintenance for installing IKO railway bearings

Since IKO bearings are rust-proofed and packaged, do not open the package until installation. In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose railway bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.

Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.

Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.

The method of installing the IKO bearing depends on the matching, condition and structure of the railway bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.

When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.

Just close the packaging bearing before installation. Generally smooth grease is smooth, not clean, and directly adds smooth grease. Smooth oil, generally not clean, but use instruments or high-speed bearings and clean with clean oil to remove the rust inhibitor applied to railway bearings. Remove the bearing, rust and rust inhibitor, we can't open it. In addition, it has been sealed up, the VTC grease bearing, not washed directly. The mounting method of the bearing differs depending on the bearing layout and the premise. Generally, more shafts are twisted, and the inner ring nuisance is suitable for the request.

The fit of the IKO bearing to the shaft is generally a transition fit. The fit between the race and the housing bore is generally a clearance fit. Therefore, the bearing is easier to install. The center shaft of the two-way thrust bearing should be fixed on the shaft to prevent relative The shaft rotates. The installation method of the railway bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.

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How to deal with the problem of FAG imported bearings heating

Overheating of the microstructure after quenching can be observed on the rough mouth of FAG imported bearing parts. However, the exact microstructure must be observed to determine the degree of overheating. If coarse needle-shaped martensite appears in the quenched structure of GCr15 steel, it is quenched and superheated. The formation may be caused by excessive overheating of the quenching heating temperature or excessive heating and holding time; or it may be due to the serious banding of the original structure, forming a local martensite needle-like coarseness in the low carbon zone between the two zones. Local overheating caused. The retained austenite increases in the superheated structure, and the dimensional stability decreases. Due to the overheating of the quenched structure, the coarseness of the steel crystals will result in a decrease in the toughness of the parts, a decrease in the impact resistance, and a decrease in the life of the FAG bearings. Excessive heat can even cause quenching cracks

If the quenching temperature is low or the cooling is poor, the tortite structure exceeding the standard is produced in the microstructure, which is called the underheated structure, which reduces the hardness and the wear resistance sharply decreases, which affects the bearing life of the FAG imported bearing.

The cracks formed by FAG imported bearing parts due to internal stress during quenching and cooling are called quenching cracks. The causes of such cracks are: due to excessive heating temperature of quenching or too rapid cooling, the microstructure stress when the thermal stress and metal mass volume change is greater than the fracture strength of the steel; the original defects of the working surface (such as surface micro cracks or scratches) Trace) or steel internal defects (such as slag inclusions, severe non-metallic inclusions, white spots, shrinkage residuals, etc.) form stress concentration during quenching; severe surface decarburization and carbide segregation; insufficient tempering after quenching of parts Or not tempered in time; the cold punching stress caused by the previous process is too large, forging and folding, deep turning tool marks, sharp edges and corners of the oil groove. In short, the cause of quenching crack may be one or more of the above factors, and the existence of internal stress is the main reason for the formation of quenching cracks. The quenching crack is deep and slender, the fracture is straight, and the fractured surface has no oxidation color. It is often a longitudinal straight crack or ring crack on the FAG imported bearing ring; the shape of the FAG imported bearing steel ball is S-shaped, T-shaped or ring-shaped. The microstructure of the quenching crack is that there is no decarburization on both sides of the crack, and the difference is obvious with forging cracks and material cracks.

FAG imported bearing parts have thermal stress and tissue stress during heat treatment. These internal stresses can be superimposed or partially canceled. It is complex and variable because it can follow heating temperature, heating speed, cooling method, cooling rate, The shape and size of the part change, so heat treatment deformation is inevitable. Knowing and mastering the changing rules can make the deformation of FAG imported bearing parts (such as the oval of the ferrule, the size of the ferrule, etc.) in a controllable range, which is conducive to the production. Of course, mechanical collisions during heat treatment can also deform the part, but this deformation can be reduced and avoided with improved handling.

In the heat treatment process of FAG imported bearing parts, if it is heated in an oxidizing medium, the surface will be oxidized to reduce the mass fraction of carbon on the surface of the part, resulting in surface decarburization. The depth of the surface decarburization layer exceeds the final processing allowance and the part is scrapped. Determining the depth of the surface decarburization layer The metallographic method and the microhardness method can be used in the metallographic examination. The surface layer microhardness distribution curve measurement method shall prevail and the arbitration criterion may be used.

The phenomenon that the surface hardness of FAG imported bearing parts is insufficient due to insufficient heating, poor cooling, improper quenching operation, etc. is called quenching soft point. It decarburizes the surface and can cause a serious drop in surface wear resistance and fatigue strength.

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How to deal with the problem of FAG imported bearings heating

Overheating of the microstructure after quenching can be observed on the rough mouth of FAG imported bearing parts. However, the exact microstructure must be observed to determine the degree of overheating. If coarse needle-shaped martensite appears in the quenched structure of GCr15 steel, it is quenched and superheated. The formation may be caused by excessive overheating of the quenching heating temperature or excessive heating and holding time; or it may be due to the serious banding of the original structure, forming a local martensite needle-like coarseness in the low carbon zone between the two zones. Local overheating caused. The retained austenite increases in the superheated structure, and the dimensional stability decreases. Due to the overheating of the quenched structure, the coarseness of the steel crystals will result in a decrease in the toughness of the parts, a decrease in the impact resistance, and a decrease in the life of the FAG bearings. Excessive heat can even cause quenching cracks

If the quenching temperature is low or the cooling is poor, the tortite structure exceeding the standard is produced in the microstructure, which is called the underheated structure, which reduces the hardness and the wear resistance sharply decreases, which affects the bearing life of the FAG imported bearing.

The cracks formed by FAG imported bearing parts due to internal stress during quenching and cooling are called quenching cracks. The causes of such cracks are: due to excessive heating temperature of quenching or too rapid cooling, the microstructure stress when the thermal stress and metal mass volume change is greater than the fracture strength of the steel; the original defects of the working surface (such as surface micro cracks or scratches) Trace) or steel internal defects (such as slag inclusions, severe non-metallic inclusions, white spots, shrinkage residuals, etc.) form stress concentration during quenching; severe surface decarburization and carbide segregation; insufficient tempering after quenching of parts Or not tempered in time; the cold punching stress caused by the previous process is too large, forging and folding, deep turning tool marks, sharp edges and corners of the oil groove. In short, the cause of quenching crack may be one or more of the above factors, and the existence of internal stress is the main reason for the formation of quenching cracks. The quenching crack is deep and slender, the fracture is straight, and the fractured surface has no oxidation color. It is often a longitudinal straight crack or ring crack on the FAG imported bearing ring; the shape of the FAG imported bearing steel ball is S-shaped, T-shaped or ring-shaped. The microstructure of the quenching crack is that there is no decarburization on both sides of the crack, and the difference is obvious with forging cracks and material cracks.

FAG imported bearing parts have thermal stress and tissue stress during heat treatment. These internal stresses can be superimposed or partially canceled. It is complex and variable because it can follow heating temperature, heating speed, cooling method, cooling rate, The shape and size of the part change, so heat treatment deformation is inevitable. Knowing and mastering the changing rules can make the deformation of FAG imported bearing parts (such as the oval of the ferrule, the size of the ferrule, etc.) in a controllable range, which is conducive to the production. Of course, mechanical collisions during heat treatment can also deform the part, but this deformation can be reduced and avoided with improved handling.

In the heat treatment process of FAG imported bearing parts, if it is heated in an oxidizing medium, the surface will be oxidized to reduce the mass fraction of carbon on the surface of the part, resulting in surface decarburization. The depth of the surface decarburization layer exceeds the final processing allowance and the part is scrapped. Determining the depth of the surface decarburization layer The metallographic method and the microhardness method can be used in the metallographic examination. The surface layer microhardness distribution curve measurement method shall prevail and the arbitration criterion may be used.

The phenomenon that the surface hardness of FAG imported bearing parts is insufficient due to insufficient heating, poor cooling, improper quenching operation, etc. is called quenching soft point. It decarburizes the surface and can cause a serious drop in surface wear resistance and fatigue strength.

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How to prevent NSK imported bearing inventory loss

Many users will use imported bearings. The quality of domestic bearings without imported bearings is good, and the service life is not good. Of course, the damage of imported bearings is also caused by many factors, such as: imported bearing lubrication, imported bearing speed, imported bearing inventory loss, Noise and a series of problems, today mainly introduces the main factors related to the loss of imported bearing stocks, I hope to help you.

The main reasons for the loss of imported bearing stocks are as follows:

Due to poor oil seal packaging or oil seal exceeding the expiration date, or the warehouse environment is poor, the imported bearings are rusted; the impact and vibration of the inbound and outbound handling process cause the imported bearings to be bumped; the temperature of the warehouse is not suitable or poorly managed, making the imported bearings faster. Metallographic changes occur, resulting in reduced size and shape accuracy.

Therefore, the technical tasks of the management of imported bearing warehouses are as follows:

Avoid the damage of the imported bearings during the handling of the in and out of the warehouse; reasonable distribution, so that the imported bearings can be effectively utilized without causing excessive backlog;

Minimize the loss of precision of imported bearings during inventory; prevent rusting of imported bearings during inventory, derusting imported bearings; minimize the inventory of imported bearings, save money and land; ensure the supply of imported bearings, Will not affect production due to the shortage of imported bearings;

Investigate and compare the use of imported bearings, compare and analyze, and summarize the experience to improve the supply, inventory, use and selection of imported bearings.

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SKF bearing lubrication information

SKF bearing equipment lubrication management is an important branch of SKF bearing equipment management. Lubrication work is beneficial to prolong the service life of SKF bearings, improve their operation rate, reduce the occurrence of faults, and facilitate the smooth production. On the contrary, it will lead to a significant increase in the failure rate of SKF bearings, and the number of downtimes and downtimes will increase, which will cause inconvenience to the production. In severe cases, the production tasks will not be completed and cause significant losses.

So, how do you do the lubrication of SKF bearings? We believe that we should analyze the three aspects of employee's attention, employee's operational ability and supervision and management.

First of all, how to make all employees attach great importance to SKF bearing lubrication work? This requires managers to publicize the operating staff and tell them: the role and benefits of adding lubricants somewhere, and vice versa, what kind of harm will be caused by not adding lubrication. Only by letting the operator understand the importance of equipment lubrication, they will pay attention to equipment lubrication. For example, the function of adding lubricating oil to the belt conveyor and the speed reducer is to reduce the wear between the gears, reduce the heat generated by the wear, reduce the working temperature of the equipment, protect the SKF bearing from being burned by the high temperature, and ensure the normal operation of the equipment. If the reducer does not add lubricating oil or lack of oil, it will cause the SKF bearing to burn out, which will cause the reducer to be damaged, which will make the belt conveyor unusable, resulting in the suspension of production. At the same time, they are also told: how much the equipment maintenance work is after the equipment is damaged, how complicated the equipment procurement work is, and how big the company's losses are.

Second, how to improve the operational ability of employees? This requires the management to let each employee know clearly: his position SKF bearing lubrication points and lubrication requirements. For example, which lubrication points of a piece of equipment, the specific location of the lubrication point, the method of refueling the lubrication point, the type of refueling, the frequency of refueling, and the method of checking for lack of oil. In order to enable all employees to operate this work correctly, with the support of the leaders, the employees must be provided with the necessary refueling tools such as wrenches, oil drums and oil guns.

Again, the division of labor should be clearly defined, and the specific work of equipment lubrication should be properly distributed to the appropriate operators. Establish equipment lubrication records so that after inspection, the lubrication status of each equipment can be clearly known, and the responsibility should be clearly defined. The employees who have not performed their duties should be punished accordingly.

Finally, in order to improve the work of equipment lubrication, it is necessary to establish a system for this purpose and form a document as a standard for supervision and inspection. Doing a good job of equipment lubrication records makes it easy to distinguish the responsibility of the specific operator and to find out the cause of the equipment failure, which can reduce the waste of unnecessary manpower, material resources and time resources in the production process.

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