Cleaning, overhaul and judgment of nsk bearings

1, the cleaning of the bearing

When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and clean the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.

The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning, use a brush to remove the grease and adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the bearing while rotating it in the cleaning solution. In addition, the cleaning oil should always be kept clean.

2. Inspection and judgment of bearings

In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance and whether there is dimensional accuracy. Falling damage, abnormality. For non-separable ball bearings, use one hand to support the inner ring horizontally, and turn the outer ring to check if it is in a smooth rotation.

Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance, the more careful inspection is required.

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IKO tapered roller bearing vibration maintenance detection method

Maintaining the bearing is a necessary condition for the operation of the tapered roller bearing. The common maintenance is to lubricate the IKO bearing. When reading how to select the lubrication method of the bearing, under the premise of understanding the lubrication mode of the bearing, it is also known to the maintenance of the bearing system. It is necessary to let us see how to carry out bearing lubrication maintenance.

1. Keep the bearing lubricated clean

Before inspecting the tapered roller bearing, the surface of the bearing should be cleaned first, and then the oil seal of the bearing and its surrounding parts should be carefully inspected. If there are any bad symptoms, be sure to replace it. The bad oil seal will cause damage, making IKO The bearing cloud is not normal and the equipment is shut down.

2. Pay attention to cover exposed bearings

When inspecting tapered roller bearings, do not expose the bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material. If the unshielded bearing is cleaned without performing disassembly and may be inspected, use a brush for application to clean with a petroleum solvent, then dry it with a lint-free cloth or blow it with compressed air (be careful not to let The bearing assembly starts to rotate). Check the track surface, retainers and beads of the IKO bearing with a small mirror and a probe similar to that used by dentists. Do not clean the bearing with a sealing cover or dustproof; just wipe the outer surface. If the bearing is damaged, it needs to be replaced. Replacing bearings during regular downtime maintenance is far more economical than the loss of sudden downtime selected due to damage to the array.

3. Check the lubricant of the bearing

Lubricants are important not only for bearings but also for all bearings. However, please note that it is not advisable to add too much grease to tapered roller bearings. Then it is to replace the lubricant of the bearing. Bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect the contaminants from the wreckage and then vent the oil. For grease-lubricated IKO bearings, when replacing grease, the cutter used should avoid any contact with the cotton material in any part of the bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, in particular the application of the bearing needs to pay attention to this problem.

When the waviness of the component is closely matched between the bearing ring and the bearing housing or the transmission shaft, the bearing ring may be deformed in cooperation with the shape of the adjacent component. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the housing and drive shaft to the required tolerances.

Local damage A small number of bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components. Vibration Behavior in Applications In many applications, the stiffness of an IKO bearing is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application as long as the bearings (including preload and clearance) are properly selected and their configuration in the application.

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Proper maintenance and use of TIMKEN bearings

1. Installation of TIMKEN bearings

Whether the TIMKEN bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of TIMKEN bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) Cleaning bearings and bearing related parts

(2) Check the size and finishing of the connected parts

(3) Installation

(4) Inspection after mounting the bearing

(5) Supply lubricant

2, TIMKEN bearing alignment and alignment

After the TIMKEN bearing is installed, alignment may result in additional loads, friction and vibration of the bearing if not carefully aligned. These can accelerate fatigue and reduce bearing life and can damage the life of other machine parts. In addition, increased vibration and friction can greatly increase energy consumption and risk of premature failure.

3. Basic condition monitoring of TIMKEN bearings

During use, the basic external conditions of TIMKEN bearing operation, such as temperature, vibration and noise measurements, are often monitored. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.

4. Relubricate the TIMKEN bearing

During operation, the bearing is required to have the correct relubrication to perfect its performance. The method of bearing lubrication is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.

5, TIMKEN bearing unloading

When the TIMKEN bearing will reach its end of life, it should be replaced.

Although the TIMKEN bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can promote the service life of the new bearing.

First, the use of a suitable method of removal of the tool will help prevent damage to other machine components;

Second, techniques that are improperly removed can be hazardous to the operator.

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Proper maintenance and use of TIMKEN bearings

1. Installation of TIMKEN bearings

Whether the TIMKEN bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of TIMKEN bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) Cleaning bearings and bearing related parts

(2) Check the size and finishing of the connected parts

(3) Installation

(4) Inspection after mounting the bearing

(5) Supply lubricant

2, TIMKEN bearing alignment and alignment

After the TIMKEN bearing is installed, alignment may result in additional loads, friction and vibration of the bearing if not carefully aligned. These can accelerate fatigue and reduce bearing life and can damage the life of other machine parts. In addition, increased vibration and friction can greatly increase energy consumption and risk of premature failure.

3. Basic condition monitoring of TIMKEN bearings

During use, the basic external conditions of TIMKEN bearing operation, such as temperature, vibration and noise measurements, are often monitored. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.

4. Relubricate the TIMKEN bearing

During operation, the bearing is required to have the correct relubrication to perfect its performance. The method of bearing lubrication is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.

5, TIMKEN bearing unloading

When the TIMKEN bearing will reach its end of life, it should be replaced.

Although the TIMKEN bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can promote the service life of the new bearing.

First, the use of a suitable method of removal of the tool will help prevent damage to other machine components;

Second, techniques that are improperly removed can be hazardous to the operator.

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Application of NSK Bearings in Construction Machinery Industry

There are many types and types of construction machinery and equipment. The main types are: forklifts, earthmoving machinery, compaction machinery, concrete machinery, etc.

Many modern large-scale construction machinery, such as asphalt mixing equipment, stabilized soil mixing equipment, and combined crushers, are large in scale. Each part has a quality of several tens to hundreds of tons, and most of the construction machinery is in sediment, gravel, and rain. In the harsh environment such as wind and snow, the technical condition will inevitably fall faster than other machinery. The fitting between the parts will have different degrees of looseness, wear, rust and scaling. The mating properties of the joints and the mutual position of the parts Relationships and coordination of institutional work will be affected to varying degrees, causing performance indicators such as power, economy, and reliability to decline, and even cause machine accidents. Therefore, we must pay attention to the selection and maintenance of parts in engineering machinery, especially NSK bearings. A high-quality NSK bearing can improve the working life of construction machinery, improve work efficiency, and thus improve economic efficiency.

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Comparison of grease lubrication and oil lubrication in rolling FAG bearings

The advantages of rolling FAG bearings with lubricating oil are:

1) Under certain operating specifications, the starting torque and friction loss of lubricating oil is significantly smaller than that of lubricating grease.

2) Since the lubricating oil takes away heat in the circulation to cool, it can make the FAG bearing reach a relatively high rotational speed.

3) It can guarantee a relatively high operating temperature.

4) When changing the grease, the relevant connecting parts must be disassembled, and when it is lubricated with oil, there is no such trouble.

5) The FAG bearing in the reduction gearbox is very suitable when lubricating with lubricating oil, because the oil simultaneously achieves the purpose of lubricating the gear and the FAG bearing at the same time in a splash manner. 6) In FAG bearings, grease is gradually contaminated by product wear products, abrasives, products that penetrate from the outside through the sealing device and aging products. If not replaced in time, it will cause accelerated wear of FAG bearings, and when using liquid lubricants It can be filtered to ensure its normal operation.

Advantages of rolling grease for FAG bearings:

1) Individual FAG bearing points must be refueled by hand. If the grease is used, it will save trouble and avoid accidents caused by lack of oil.

2) The grease itself has a sealing effect, which allows the use of a mechanism with a low degree of sealing to achieve a simplified design.

3) Experience has shown that in a certain speed range (n < 20000r / min or dn < 20000mm.r / min) with lithium grease lubrication has a lower temperature rise and a longer FAG bearing life than the drop method.

2. Rolling FAG bearing lubrication theory foundation: The lubrication mechanism of rolling FAG bearing belongs to the theory of elastic fluid dynamic pressure lubrication.

3, rolling FAG bearing failure type and lubrication relationship: most of the failure is due to assembly problems, poor sealing and damage. A small number of failures are caused by wear, gluing, corrosion and overheating due to lack or excess of lubricant or quality failure.

4. Basic characteristics of grease and general criteria for selecting grease:

When selecting grease, it is necessary to select the grease that is compatible with the conditions of use (temperature, speed, load, environment, etc.), which are related to the basic characteristics of the grease, and the basic characteristics of the grease depend on the thickener and base oil. kind of.

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Talking about the use of new self-lubricating plastic sliding bearing on the isolating switch

The use of new self-lubricating plastic sliding bearings on the isolating switch

First, the isolation switch definition

The Disconnector is mainly used to reliably isolate the part of the high-voltage power distribution device that needs to be powered off from the live part to ensure the safety of the maintenance work. When the isolating switch is in the sub-position, there is an insulation distance and an obvious disconnection mark between the contacts in accordance with the specified requirements; in the combined position, it can carry the current under normal loop conditions and under abnormal conditions (such as short circuit) within a specified time. Current switching device

Second, the working principle of the isolation switch

The contacts of the isolating switch are all exposed to the air and have obvious breaking points. The isolating switch has no arc extinguishing device and therefore cannot be used to cut off the load current or short circuit current. Otherwise, under the action of high voltage, the breaking point will generate a strong arc. It is difficult to extinguish itself, and may even cause arcing (relative to ground or phase-to-phase short circuit), burning equipment, endangering personal safety. This is a serious accident called "loading isolation switch". The isolating switch can also be used to switch between certain circuits to change the way the system operates. For example, in a double bus circuit, an isolated switch can be used to switch a running circuit from one bus to another. At the same time, it can also be used to operate some small current circuits; aluminum plate spot welding machine

Third, the use of the sliding bearing of the rotating part of the isolating switch

The contact of the isolating switch, that is, the separating action of the isolating knife can be completed by manual and electric control, but in any case, it is required that the rotating parts can smoothly run under any circumstances, which requires the bearing of each rotating part to be longer. After the pause of time, it can still ensure normal operation; in order to ensure the normal operation of the isolating switch during the annual maintenance process, it is required that the sliding bearing of each rotating part can resist high and low temperature staggering all the year round and can still be used after the end face cover fails. Resist the erosion of various external factors, such as salt fog, acid rain, oxidative corrosion and other natural factors.

In the early days, the domestic and foreign isolating switch manufacturers were able to solve the various rotating parts of the isolating switch. After the long-term stop, the metal sliding bearings were used in all rotating parts, such as powder metallurgy bearings, copper alloy bearings and three-layer composite. Bearings; although these bearings have adopted the self-lubricating process, they can not change the disadvantages of metal bearings, such as the lubricant is easy to dry, the corrosion and rust after the cover fails, etc. The isolation switch can not ensure the normal operation after long-term stop. . At present, the domestic use of a certain proportion of the three-layer composite bearing, although the inner diameter of the working surface is sintered with a lubricating layer, but this layer of lubricating layer thickness is only 0.03mm, when the lubricating layer works off the surface of the rotating shaft and the underlying metal copper powder layer or low The direct contact of carbon steel may result in rust and adhesion of the shaft and the surface of the metal bearing after a long pause, and the isolating switch has a risk of failure. In order to completely solve these risks, European isolation switch manufacturers first began to try to use new plastic self-lubricating bearings and after years of use prove that engineering plastic self-lubricating bearings become the most effective means of isolating switches to solve the risk of rotational failure.

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How to choose the servo motor housing correctly

Parallel slitted housings are usually made of a single piece of metal. Aluminum is often used, and spiral slitting is used to accommodate deflection and torque transfer. They usually have good functionality and have a price advantage, and in many practical applications, it is the product of choice. The single piece of original data is designed to complete the torque transfer without backlash and the maintenance-free advantages. There are two fundamental series here: single-slit and multi-slit.

The single-slot type has a long multi-ring long slit, which gives the bearing housing a good elasticity and a small bearing load. It can accept all kinds of deflections, and is most suitable for handling angular displacement and axial displacement, but the parallel bias has a weaker receiving force. Because the single slit is bent together in two different directions, a large external pressure will occur. This incurs premature damage to the parts. Although the long single-sleeve housing can be easily bent under the biased condition, the rigidity of the bearing housing has the same effect under the torsional load. Excessive turning clearance under torsional loads can affect the accuracy of the housing and weaken its overall function. Single-slot housings are an economical choice and are best suited for low torque applications, especially in articulated encoders and other lighter instruments.

Multi-slit housings typically have 2-3 slits to create a low torque rigid Issue. The multi-slit type allows the slit to be shortened without impairing the biasing ability. The short slit increases and overlaps the torque rigidity of the bearing housing to allow it to accept a very large torque. This function makes it suitable for light load applications, such as the connection of servo motors and lead screws. This function does not have any negative effects: as the size of the slit increases beyond the single-slot type, the bearing load will increase, but in a few cases, the bearing can be sufficiently useful to maintain. A few manufacturers have extended the concept of multi-cutting to another level. In addition to a set of multiple slits, two sets of multiple slits are also used together. Multiple sets of multiple slits make the housing more flexible and biased. The increase in size means the ability to accept parallel deflection. Compared to single slits and single-sleeve multi-slit housings, multiple sets of multi-slit housings can be bent together in different directions in parallel deflections. Comply with this bias. Today, a large number of this series of housings are made of aluminum, but there are also a few manufacturers that supply stainless steel for design. In addition to corrosion resistance, stainless steel housings also increase torque acceptance and stiffness, sometimes reaching twice the equivalent of aluminum. But this increased torque and stiffness is also offset by increased mass and inertia. Many time negative effects will also surpass their strengths, so users have to find other ways of bearing housing. In the use of small motors, a large percentage of the motor torque is used to restrain the inertia of the housing, which will severely impair the overall function of the piece.

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How to judge the quality of KOYO bearings

First, the outer packaging of KOYO bearings is clear:

Under normal circumstances, KOYO bearings of the factory brand have their own special designers to design the external packaging, and arrange the production facilities to produce and produce, so the packaging is very clear from the line to the color block, unambiguous, part The brand's accessory packaging also has a unique design specifically designed to protect your intellectual property.

Second, whether the steel printing on KOYO bearings is clear:

Brand words, labels, etc. will be printed on the KOYO bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but the recess is deep and very clear. The fonts of counterfeit products are not only blurred, but because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand.

Third, KOYO bearing KOYO bearing body has a strange noise:

Hold the KOYO bearing inner sleeve of KOYO bearing with your left hand, and turn the outer sleeve with your right hand to make it rotate to hear if there is any noise. Due to the backward production conditions of most counterfeit products, it is completely hand-worked. It is inevitable that impurities such as sand will be incorporated into the KOYO bearing body during the production process, so it will make noise when rotating. This is the biggest difference between a factory brand that strictly enforces production standards and operates with machines.

4. Is there any turbid oil on the surface of KOYO bearings:

This should be paid special attention when purchasing KOYO bearings. Since the current domestic anti-rust technology is not particularly good at home, it is easy to leave a thick oil trace when the KOYO bearing body is rust-proof, and it is sticky on the hand, and the foreign original KOYO bearing is almost seen. Not to trace the anti-rust oil, but it is particularly careful that the expert said that KOYO bearing smells like a smell, it must be under the anti-rust oil, just can't see it.

5. Whether the chamfer of KOYO bearing is uniform:

The so-called chamfering of KOYO bearings, that is, the intersection of the horizontal and vertical faces, the counterfeit KOYO bearings are not well handled at these corners due to the limitation of production technology.

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NA bearing lubrication skills

Rust prevention performance

The grease used in the INA bearing must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. Grease should have good adhesion to form an oil film on the surface of the steel, even if the grease is filled with water.

Mechanical stability

Grease becomes soft during machining and causes leakage. When there is a vibration application example, the grease will be pulled from the INA bearing housing into the INA bearing. If the mechanical stability of the grease is not sufficient, the grease will be continuously thrown out of the INA bearing, which will cause mechanical collapse of the soap structure and destruction of the grease.

Oil seal

The oil seal is necessary to protect the INA bearings and lubricants from external contamination, and no matter whether the sundries or moisture can penetrate into the INA bearing to prevent damage. Proper installation and maintenance is an important factor in the longest service life of INA bearings. At the same time, we must pay attention to the cleanliness of the INA bearing, the correctness of the INA bearing selection and the selection of appropriate installation and maintenance tools. INA bearings must be protected from contaminants and moisture and must be properly installed and lubricated. The design of the INA bearing, the condition of the oil seal, the type of lubricant and the lubrication cycle, as well as the special maintenance play an important role.

Mixed grease

Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually soften and eventually damage may occur due to the loss of grease. If you don't know which type of grease was originally used in INA bearings, you should first remove the old grease inside and outside the INA bearing to add grease.

Classification of oils and fats

According to temperature and working conditions: grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by working temperature. Imported INA bearings operating at a certain temperature must choose the correct consistency at the same temperature. Grease with good lubrication. Grease is manufactured in different operating temperature ranges and can be classified into low temperature (LT), medium temperature (MT) and high temperature (HT) greases. At the same time, there is a type of grease called EP (extrusion resistant) or EM (resistant to extrusion and added molybdenum disulfide), with additives to enhance the strength of the lubricant film.

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Test the effect of KOYO bearing grease deterioration on temperature

The grease used in KOYO bearings must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. The grease should have good adhesion and form an oil film on the surface of the steel. The grease will become soft during machining and cause leakage. In normal operation, grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is not enough, 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. If the grease is wrongly selected, all the measures for preventing the bearing are futile. It is important that the viscosity of the base oil at the working temperature provides sufficient lubrication. The viscosity is mainly affected by the temperature, it decreases as the temperature rises, and it rises when the temperature drops. Therefore, it is necessary to know the viscosity of the base oil at the operating temperature. Mechanical manufacturers often specify the use of certain greases, however most standard greases are available in a wide range of applications.
Grease is very critical in the use of KOYO bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the bearing.

1 Oil flow observation method

Take two measuring cups, one of which is filled with the lubricating oil to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted to allow the lubricating oil to slowly flow to the empty cup. In the middle, observe the flow, the quality of the lubricating oil flow should be slender, even, continuous, if the oil flow suddenly and slowly, and sometimes there is a large flow, then the lubricant has deteriorated.

2 manual method

The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubricating oil. There are many impurities inside, can not be reused, should be replaced with new lubricants.

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