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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What is the range of FAG cross roller bearings?

FAG bearing cross-roller bearings can withstand loads from all directions (such as axial, thrust or momentum loads). Since the FAG is in contact with the outer surface of the track, the bearing is subject to load and elastic deformation is small.

This type of FAG imported bearings are commonly used in industrial robots, mission machinery and medical facilities. FAG requires high rigidity, tightness and high speed to ensure accurate position in cross roller bearings, because cylindrical rollers are in The 90-degree V-groove rolling surface FAG bearings are arranged perpendicular to each other by the distance maintaining device, so that one cross-roller bearing can bear loads in all directions such as radial load, axial load and moment load.

The size of the inner and outer rings is minimized, and the special ultra-thin type is a small size close to the limit and has high rigidity, so it is most suitable for the joint portion or the rotating portion of the industrial robot.

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Skf bearing products deep groove ball bearings commonly used suffix

The standard products provided by skf have various types of skf bearings of 20,000. In addition to rolling skf bearings, skf group also manufactures linear bearings, plain bearings, bearing housings, ball and roller screws, textile machinery parts, and retaining rings. , machine tools and various precision mechanical parts. With extensive experience in these areas, he has the knowledge and expertise to develop, manufacture and apply a wide range of advanced engineering products.

The small ones are only 0.003 grams of miniature bearings, roughly 34 tons of giant skf bearings. In addition, skf also provides a number of bearing repair tools, grease and bearing testing equipment, in order to make skf imported bearing users get higher efficiency and achieve worry-free operation.

Skf bearing featured product explorer series bearing, this series of skf bearings has better performance and longer life than any brand on the market. It has been outstanding in design and use. It is the top scientist of skf engineering and research center in the Netherlands. After years of careful research by the engineering team, the skf explorer bearing shell is identified by the EXPLORER logo on the outer ring side of the bearing and the EXPLORER logo on the box, but the product number remains unchanged.

Skf bearing products deep groove ball bearings commonly used suffix:

CN: Normal Group Radial Clearance: Usually used only in combination with the following letters to indicate a narrow or offset range of play. H: The narrowed clearance range is equivalent to the upper half of the original clearance range. L: The narrowed clearance range is equivalent to the lower half of the original clearance range. The clearance range of the P offset is equivalent to the composition of the upper half of the original clearance range and the lower half of the next set of clearance ranges.

The above letters are also applicable to the following combinations of gaps into corresponding meanings: C2, C3, C4, C5, for example C2 C2: radial clearance is smaller than the normal group. C3: The radial ranger is larger than the normal group. C4: Radial clearance is greater than C3. C5: Radial clearance is greater than C4.

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Discussion: Serious problems in bearing wear of Raymond mill

  First, improper installation (about 16%)

1. Use brute force during installation. Directly tapping the bearing with a hammer will cause the greatest damage to the bearing; it is the main cause of deformation.

2, the installation is not in place, the installation is biased or not installed to the bearing position, resulting in too small bearing clearance. The inner and outer rings are not in the center of uniform rotation, resulting in a small ball mill of different hearts.

Recommendation: Select an appropriate or professional bearing installation tool, and use a special instrument to detect it after installation.

Second, poor lubrication (about 50%)

According to the survey, poor lubrication is one of the main causes of premature bearing damage, coal gangue crusher. The main reasons include: not adding lubricant or lubricating oil in time; lubricant or lubricating oil is not filled in place; improper selection of lubricant or lubricating oil; inaccurate lubrication method, etc.

Recommendation: Choose an accurate lubricant or lubricant and use an accurate lubrication method for the ball mill manufacturer.

Third, pollution (about 14%)

Contamination can also lead to premature bearing damage, which means that dust, metal chips, etc. enter the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is contaminated by the impact crusher.

Recommendation: It is best not to disassemble the bearing before use; keep the installation environment clean during installation, clean the bearing to be used; and strengthen the bearing seal.

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Easy maintenance method after fan or computer bearing wear

According to the degree of wear, there are two ways to repair: the first one is only for fans, and the second is for computer trials.

The first type: first clean the dust on the fan, avoid dust from entering the bearing during the installation process, then tear off the self-adhesive of the bearing seal, remove the bayonet on the shaft, and remove the residual in the bearing. Clean the oil with a clean tissue or a soft cloth, then wipe the shaft clean and add a little butter to the bearing. The principle is that it should not be too much to avoid seriously affecting the speed; then the aluminum can of the can is cut off. Cut a disc as large as the diameter, and dig a small hole in the middle that can pass through the shaft, and pad it between the bearing and the bayonet to reduce the axial movement and parallel movement of the bearing. If the gap is large, it is necessary to put a few thickening on the pad to make the bearing's back and forth movement distance below 0.5mm; the last step is to seal the oil seal, add a little butter, and finally put the fan back to the graphics card. You're done.

The second type: the sound of the fan inside the computer case is getting louder and louder because the computer's graphics card fan is worn out due to lack of oil in the bearing, the bearing hole is worn out - the gap between the fan shaft and the bearing is too large, and the axial movement of the fan The gap is too large and the fan blades can move a few millimeters back and forth.

The fan moves axially after the rotation, and the plane of rotation of the blade is also swaying, which not only wears more and more, but also generates a lot of noise. The vast majority of fan failures are due to this. Although it is the most troublesome to change a new fan, but it does not meet the spirit of DIY, and secondly, it is not always possible to find a model that can be replaced.

Of course, fans with such faults are not unrepairable. I will introduce a repair method now. The material is very simple, just a small piece of cans of aluminum and a little bit of butter (the butter should be clean and free of impurities).

1. First clean the dust on the fan to avoid any dust entering the bearing during the installation process;

2. Remove the self-adhesive of the bearing seal and remove the bayonet pin on the shaft;

3. Wipe the residual oil in the bearing with a clean tissue or a soft cloth, and then wipe the shaft clean;

4, add a little butter in the bearing, the principle is to be more than not to avoid serious impact on the speed;

5. Cut the aluminum skin of the can to cut a round piece as the outer diameter of the bearing pin, and dig a small hole in the middle that can pass through the shaft, and pad it between the bearing and the bayonet. The distance that the small bearing moves axially and moves in parallel. If the gap is large, it is necessary to put a few thickening on the pad, so that the front and rear moving distance of the bearing is below 0.5mm;

6. Seal the oil seal, add a little butter, and finally put the fan back into the graphics card.

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