40w laser engraving machine

INA ball screw bearing use damage countermeasures

INA bearing structure design is fair and has the ability to improve the predecessor, will have a longer ball screw bearing life. Bearings are manufactured through multiple processing steps such as casting, heat treatment, turning, grinding and assembly. The fairness of each processing technology, the improvement of predecessors, and the inconsistency will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of bearing working surface shows that the relationship between grinding process and bearing surface quality is closely related.

The metallurgical quality of INA bearing materials was once the main factor affecting the early failure of dynamic ball bearings. With the improvement of metallurgical technology (such as vacuum degassing of bearing steel), the quality of raw materials is improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting bearing failure. The proper selection of materials is still a factor that must be considered in bearing failure analysis.

The main task of INA bearing failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, prolong the service life of bearings and avoid sudden occurrence of bearings. Early failure of sex.

1, bearing maintenance, overhaul, and abnormal handling

In order to maintain the original performance of the ball screw bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.https://www.supplyforever.com/

The important role of SKF non-standard bearing lubrication in the elimination of the guide

In general, non-standard bearings heat up after they start running, and after a period of time, they are at a lower temperature (usually 10 to 40 degrees higher than room temperature). The normal time is different depending on the size, form, rotation speed, lubrication method of the SKF bearing, and the exothermic conditions around the non-standard bearing. It takes about 20 minutes to several hours.

When the temperature of the non-standard bearing does not reach the normal state and the abnormal temperature rises, the following reasons may be considered. In addition, the machine should be stopped as soon as possible and necessary countermeasures should be taken. Temperature is essential for maintaining the proper life of non-standard bearings and preventing deterioration of lubricating oil. It is recommended to use as much as possible under non-high temperature conditions (generally below 100 degrees). The main cause of abnormal temperature rise is too much or too little. Poor installation of SKF bearings. The internal clearance of non-standard bearings is too small, or the load is too large. The friction of the seal is too large. The lubricant does not match. The creep of the mating surface.

1. Firstly, the parts of the SKF bearing are lubricated to reduce the friction and wear of the bearing;

2. The rolling contact surface of the bearing often forms an appropriate oil film to prolong the fatigue life of the non-standard bearing;

3. The heat generated by friction or other reasons inside the bearing is removed by lubrication;

4. Through lubrication, it can achieve anti-rust and dust-proof effects on non-standard bearings.

Therefore, we must correctly understand the importance of lubrication for SKF bearings, improve bearing performance and reduce consumption.https://www.supplyforever.com/

Extend the life cycle of TIMKEN angular contact ball bearings from maintenance

The main task of angular contact ball bearing failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, extend the service life of bearings, and avoid TIMKEN bearings. A sudden early failure occurred.

First of all, the structural design is reasonable and advanced, so that there will be a long angular contact ball bearing life. Bearings are generally manufactured through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished TIMKEN bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of bearing working surface shows that the grinding process is closely related to the bearing surface quality.

1, pay attention to the installation of the bearing

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

(1) cleaning the bearing and bearing related components;

(2) Check the size and finishing of the connected components;

(3) installation;

(4) Inspection after installing the bearing;

(5) Supply lubricant. Carefully do the five steps of bearing installation

2, alignment, straightening

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 the service life of bearing products 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

During use, the basic external conditions of the bearing operation are often monitored, such as temperature, vibration and noise measurements. Bearing experts point out that these regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.https://www.supplyforever.com/

Application of coating in shaft machining

Core Tip: Changing machining tasks are constantly placing new demands on single or small batch parts manufacturers. If you want to gain an edge in the fierce competition, you must use efficient milling tools, first
Changing machining tasks are constantly placing new demands on single or small batch parts manufacturers. If you want to gain an edge in the fierce competition, you must use efficient milling tools. The first task is to meet the technical and economic requirements.
The competition between most tool and mold manufacturers is reflected in the services they can provide: such as the size, material, processing and precision of the workpieces that can be machined. Individualized strategies can improve time and cost pressures and provide advice on process optimization to service.
One of the difficulties is productivity, which is also a major challenge for most processing companies. To optimize costing and increase competitiveness, tool manufacturer Paul Horn has developed a range of products for different applications and materials, including DS series full carbide milling cutters, DA series end mills and spiral end mills. DM series combination milling cutter.
In general, the user will select the tool according to the product manual or according to special specifications. As a result, the versatile tool and tooling industry requires high flexibility and short lead times. In addition, Horn has been engaged in tool development and analysis of numerous application cases for many years, which has enabled them to have strong professional capabilities and to solve complex milling problems.
A medical device manufacturer hopes to simplify the casting process of a cylindrical support by providing a funnel-shaped gate. WF Fottner, from Moessingen near Tuebinen, took on this task, using four templates to make the required two-piece injection casting mold.
The goal is to process 2 million times
The mould has an edge length of 500 mm and a special profile according to the user's requirements, with the aim of achieving 2 million machining – the company has designed a special mould for this and found a special process for the tool. This collaboration with Tuebingen's tool manufacturers not only shortens the geographical distance, but more importantly meets the requirements of tool type, efficiency, precision and economy.
The first task is to rough the template of the closed edge. The material is hot work die steel 1.2343ESU. The specific processing parameters are as follows: the angle cutter with DM series has a diameter of 12 mm and the cutting head radius is 2 mm. Inspection control is performed using a 0.2 mm gauge block. This process features patented components for connecting the shank and the blade for diameters ranging from 8 to 12 mm.
Since the shank is used as a bracket for blades of various diameters, the fit between them needs to be very precise, so it is necessary to select the tool as little as possible in accordance with the cutting parameters for economical machining.
Carbide shanks have a wide range of lengths and a collapsible construction. The use of a holder with a length of up to 140 mm allows access to the inside of the cavity and achieves high radial accuracy.
Due to the delivery period and the ability to make better use of the machining center, two brass electrodes can be placed next to the machining center template for processing additional injection casting molds. Although the milling parameters of the two are different (different from the template, the brass electrode requires a humid environment), the CNC programming process can be made relatively simple because the DM series milling cutter can be used alone. The brass milling cutters on the catalogue can have 2, 3 or 4 cutting edges, respectively, and the diameter of the cutting circumference ranges from 0.3 to 12 mm. The recommended machining parameters for roughing with electrodes are: ring and full radius structures with 2 to 4 blades. For semi-finishing and finishing of wire molds, double-edged micro-milling cutters with a diameter of 0.3 to 2 mm can be used.

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Bearing fatigue damage

Some of the common fatigue damages in bearings are caused by a variety of reasons.
The INA bearing fatigue life test is an intensive fatigue life test method that fully lubricates the wear factor of the automobile bearing to the maximum extent, and uses the enhanced load and speed to highlight the bearing fatigue factor.
The calculation method of bearing fatigue life and fatigue life test are complementary, and the results obtained by the two have sufficient correspondence.
However, in reality, for each specific use case, a sufficient number of INA bearings are taken for life testing to verify that the selected bearings are suitable, which is very economical, time and labor. The test method for the bearing life of an automobile is used only when it is necessary or important. In most cases, the standard life calculation method is used to estimate the service life of the bearing, which has a sufficient degree of dependence.
To predict the fatigue life of an INA bearing and determine the remaining life, it is necessary to know all the bearing fatigue damage, which will take a long time. However, since rolling fatigue is fatigue occurring under the compressive stress of the contact point, great material changes will occur to achieve breakage. Therefore, in addition to the early crack on the surface, the chemical influence of the raceway, and the expansion of the crack prior to the material change, it is possible to determine the fatigue of the automobile bearing by detecting the material change.
The secondary reason for INA bearing breakage is that the defect takes two major voxels. When a applied load crosses the material strength limit to form a part fracture, it is called an overload fracture. The reason for the overload is that the slave suddenly has a problem or is not properly installed. Defects such as microcracks, shrinkage cavities, air bubbles, large foreign bodies, overheated tissue and localized burns of bearing parts are also causing fractures at the defects when they are impacted by overload or violent vibration, called defect fracture. It should be pointed out that the automobile bearing is in the process of being manufactured, and the re-inspection of the material, the control of the casting and the heat treatment, and the control of the process can be accurately analyzed by the instrument to determine whether the above defects can be obtained or not. But in general, all the INA bearing breakage effects are generally overloaded.https://www.supplyforever.com/

Bearing selection

Core Tip: The types, types and sizes of rolling bearings are varied. In order for the mechanical device to perform as expected, it is essential to select the most suitable bearing. For the selected bearing, need
The types, types and sizes of rolling bearings are varied. In order for the mechanical device to perform as expected, it is essential to select the most suitable bearing. In order to select a bearing, it is necessary to analyze many factors, and to study and evaluate the procedures for selecting bearings from various angles. There are no special specifications, but the general sequence is as follows: (1) Master the conditions of use of mechanical devices and bearings, etc. (2) Clearly Bearing requirements (3) Type of selected bearing (4) Selected bearing arrangement (5) Selected bearing size (6) Selected bearing specifications (7) Mounting method of selected bearing

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Extend the life cycle of TIMKEN angular contact ball bearings from maintenance

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Analysis of the Influence of TIMKEN Micro-bearing Lubrication Method on Performance

When testing the advantages of chrome steel and stainless steel as TIMKEN bearing materials, they were found to not only have rust preventive effects. Chrome steel is the most common miniature bearing material. It is harder than stainless steel, so it lasts longer. However, at higher temperatures, its performance is not good.

At a high temperature of 120C, it undergoes tremendous deformation and the load is reduced. It can withstand a high temperature of 150C, but an instantaneous temperature of 150C or higher will reduce the life of the imported bearings. The heat treatment can subject the bearing to an elevated temperature of 170C.

The purpose of lubrication of TIMKEN bearings is to reduce internal friction and wear of the bearings, to prevent sticking, and the lubricating effect is as follows.

(1). Reduce friction and wear.

In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the micro bearing, metal contact is prevented, and friction and wear are reduced.

(2). Extend fatigue life.

The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.

(3). Discharge friction heat, cooling

The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.

(4). Other

There is also the effect of preventing foreign matter from entering the inside of the bearing or preventing rust and corrosion.

Lubrication method:

The lubrication method of TIMKEN bearings is divided into grease lubrication and oil lubrication. In order to make the miniature bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and 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 and comparing the advantages and disadvantages of grease lubrication and oil lubrication.

The most common stainless steel 440 for miniature bearings, it is hard enough and strong to load (20% less than brass steel), but it can resist rust, can withstand the instantaneous high temperature of 250C and the continuous high temperature of 300C. We often mistakenly think that all stainless steel is non-magnetic. 440 stainless steel is magnetic. It is not completely rust-proof, but is affected by salt, acid and alkali. The 316 grade has good rust resistance, no magnetic, but it is softer and therefore has less load. Because it is not strong, the 316 bearing is not accurate and feels rough.

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Grease performance and its evaluation index

Greases are used in a wide range of applications and work conditions vary widely. Different mechanical equipment requires very different grease properties. Grease performance is a combination of grease composition and preparation process. The evaluation of grease performance is not only decisive in production and research work, but also essential in the selection and inspection of grease in the use department. According to the specific conditions of the grease parts of automobiles and engineering machinery, the basic requirements for grease are: proper consistency, good high and low temperature performance, good extreme pressure, abrasion resistance, good resistance to water, corrosion, rust and stability. Sex and so on.

l. Consistency

At the specified shear force or shear rate, the degree of deformation of the grease structural system is measured to express the structurality of the system, which is the concept of consistency. It is an important performance indicator related to the retention and sealing properties of the grease on the lubricated parts, as well as the pumping and filling methods of the grease. Some lubrication points use grease because they have a certain consistency, which gives them a certain resistance to loss. Greases of different consistency are suitable for different working conditions such as mechanical speed, load and ambient temperature. Therefore, consistency is an important indicator of grease.

The consistency level of the grease can be expressed as the degree of penetration. The penetration of the grease refers to the depth of the standard cone of the specified weight penetrating the grease sample under the specified time and temperature conditions, expressed as (l/10) mm. The measurement of the penetration of the grease can be carried out according to the method specified in the "Measurement method of grease penetration" (GB/T269-91). Grease penetration usually includes four types: no work, work, extended work, and block penetration. The non-working cone is generally not as effective as the working cone, and it usually represents the consistency of the grease in use. It is best to use the working cone. Extended working penetration is suitable for taper measurements measured over 60 times. Summary of the method for measuring the penetration of grease: The cone assembly is released from the cone meter at 25 ° C, and the cone is sunk into the depth of the sample for 5 s to determine the above four degrees of penetration of the grease.

Cone penetration reflects the deformation and flow properties of the grease at low shear rates. The higher the cone penetration value, the softer the fat, that is, the smaller the consistency, the easier it is to deform and flow; the lower the cone penetration value, the harder the fat, that is, the greater the consistency, the less likely to deform and flow. It can be seen that the degree of penetration can effectively represent the consistency of the grease and is an important basis for the selection of grease. In China, the range of the degree of penetration is used to divide the consistency of the grease. GB7631.1-87 is consistent with the consistency number of the American Grease Association (NLGI), which is widely used internationally.

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How to clean and judge whether to replace SKF cylindrical roller bearing

When disassembling the lower bearing inspection, first record the appearance of the SKF cylindrical roller bearing, confirm the residual amount of the lubricant, and wash 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. In rough cleaning, if the bearing is rotated with dirt, it will damage the moving surface of the SKF cylindrical roller bearing, so you should pay attention to it. In the rough cleaning oil, use a brush to remove the grease and the 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 oil. In addition, the cleaning oil should always be kept clean.

2. Inspection and determination of SKF cylindrical roller bearings

In order to determine whether the removed SKF cylindrical roller bearing can be reused, check the SKF cylindrical roller bearing after cleaning. Carefully check the raceway surface, the dynamic spring surface, the state of the mating surface, the wear of the cage, and the bearing clearance. The increase and the presence or absence of damage and abnormality regarding the decrease in dimensional accuracy. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.

Separate SKF cylindrical roller bearings such as tapered roller bearings can be inspected separately for the raceway surface of the moving body and the outer ring.

Because large bearings cannot be rotated by hand, pay attention to checking the appearance of moving bodies, raceways, cages, ribs, etc. The higher the importance of bearings, the more careful inspection is required.

The determination of whether it can be reused is determined by considering the damage degree, mechanical function, importance, operation premise of the German SKF cylindrical roller bearing, and the period until the next inspection. However, if there are the following defects, they can no longer be used, and new bearings must be replaced:

(a) cracks or gaps in any of the inner ring, the outer ring, the moving body and the cage;

(b) There is a break in any of the ferrule and the moving body;

(c) obvious jamming on the raceway surface, ribs and moving body;

(d) The cage is significantly worn or the rivet is significantly slack;

(e) There is rust and injury on the raceway surface and the moving body;

(f) There are severe indentations and marks on the raceway surface and the moving body;

(g) There is significant creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;

(h) significant discoloration due to heat;

(i) SKF cylindrical roller bearings sealed with grease, and the seal or dust cover is damaged.

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Causes of vibration of NTN tapered roller bearings during operation

In general, the rolling bearing itself does not produce noise. The "NTN tapered roller bearing noise" that is usually felt is actually the sound effect of the bearing directly or indirectly vibrating with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the entire NTN tapered roller bearing application.

Excitation due to changes in the number of loaded rolling elements

When a radial load is applied to an imported bearing, the number of rolling elements carrying the load will change slightly during operation, ie: 2-3-2-3.... This causes a shift in the load direction. The resulting vibration is unavoidable, but can be mitigated by axial preloading and applied to all rolling elements (not for cylindrical roller bearings).

Component waviness

In the case of a tight fit between the NTN tapered roller bearing ring and the bearing housing or the drive shaft, the NTN tapered roller bearing ring may be deformed in accordance 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.

Partial damage

Small parts of NTN tapered roller bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling through damaged NTN tapered roller bearing components produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components.

Vibration behavior in applications

In many applications, the stiffness of NTN tapered roller bearings is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application by properly selecting NTN tapered roller bearings (including preload and clearance) and their configuration in the application.

There are three ways to reduce vibration:

– removing critical excitation vibrations from the application;

– suppressing the critical excitation vibration between the excitation component and the resonance component;

– Change the stiffness of the structure to change the critical frequency.

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How to install to enable TIMKEN self-aligning ball bearings to achieve the longest service life

In order to ensure the long life of TIMKEN self-aligning ball bearings, it is not enough to meet the general installation and adjustment requirements. It is recommended to take the following measures:

(1) The TIMKEN self-aligning ball bearings are grouped according to the size of their interference fit surface. In each group, the TIMKEN self-aligning ball bearings are arranged in order of their clearance size. The corresponding shaft or seat hole diameters are grouped in the same way. The TIMKEN self-aligning ball bearing set with a large interference fit surface size is matched with a large diameter shaft set or a seat hole set, and a small size and a small diameter corresponding group are selected. In each corresponding group of matching, the TIMKEN self-aligning ball bearing with large clearance is tightly matched, and the TIMKEN self-aligning ball bearing with small clearance takes a loose fit. The result of this selection makes the TIMKEN self-aligning ball bearing have the same interference and interference in the same batch of machines, which is neither too loose nor too tight, and the clearance is relatively uniform, thus ensuring the installation of TIMKEN self-aligning ball bearings. After the pre-stress is appropriate, and avoid creep, ferrule bursting, impact due to improper play, vibration or heat, cohesion and other abnormal TIMKEN self-aligning ball bearing failure.

(2) The coaxiality of the journal and the seat hole at both ends of the support and the perpendicularity to the support end face are strictly ensured to prevent the occurrence of additional load. If possible, the mechanical components acting on the load outside the TIMKEN self-aligning ball bearing should be slightly away from the TIMKEN self-aligning ball bearing at the end that is more susceptible to damage, while the shaft and rotating part system should be as smooth as possible.

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How to install to enable TIMKEN self-aligning ball bearings to achieve the longest service life

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Several methods to check whether SKF tapered roller bearing grease is reused

If the grease used in SKF tapered roller bearings cannot be used, if it is not noticed, it will cause great damage to SKF tapered roller bearings. Therefore, you must learn how to judge whether the grease can be reused.

Oil droplet trace method

Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is a black powder on the surface, touch the hand with a feeling of resistance, it means that there are a lot of impurities in the lubricant. Good lubricants are powder-free, dry and smooth by hand, and have yellow marks.

2. Handcuffs

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 lubrication. There are many impurities in the oil, which can no longer be used. New lubricants should be replaced.

3. Illumination method

On a clear day, use a screwdriver to pick up the oil at a 45-degree angle to the horizontal. In the light of the sun, observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can be inherited. If the grinding debris is too much, the lubricating oil should be replaced.

4. 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 activity, the quality of the lubricating oil flow should be slender, average, continuous, if the oil flow suddenly and slowly, and sometimes there is a large flow, then the lubricant has deteriorated.

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Note on the use of grease in IKO plain bearings

Lubricating this process is indispensable in the use of flat bearings. However, there are many ways to lubricate. Various lubrication methods should pay attention to different problems during the lubrication process, which leads to the user's Confused, here I will introduce you to the precautions for IKO bearing oil lubrication and grease.

1, grease lubrication

Relubrication of IKO bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the flat bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.

2, lubricating oil lubrication

Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the oil level of IKO bearing housing is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.

Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced.

If the sample is darkened or thickened, it may indicate that the lubricant has begun to carbonize and the old lubricant should be completely replaced. If possible, flush the oil line with fresh oil. When changing the lubricating oil, make sure that the new and old models of the replaced oil are the same and supplement the required oil level.

The grease used in the flat 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. Grease becomes soft during machining and causes leakage. When there is a vibration application example, grease will be trapped inside the bearing by the IKO bearing housing. If the mechanical stability of the grease is insufficient, the grease will be continuously thrown out of the bearing, which will cause mechanical collapse of the soap structure and destruction of the grease.

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Rolling bearing cleaning is extensive, precautions

1. Bearing cleaning

Most of the newly purchased bearings are coated with grease. These greases are mainly used to prevent the bearings from rusting and do not act as a lubricant. Therefore, they must be thoroughly cleaned before they can be installed. The cleaning method is: the bearings sealed with anti-rust oil can be cleaned with gasoline or kerosene. For heavy-duty oils and anti-rust greases such as industrial Vaseline rust-proof bearings, first use 10 or 8 oil or transformer oil to heat and dissolve (oil temperature should not exceed 100 °C), and immerse the bearings in oil. After the rust-proof oil is melted and taken out, it is cooled, and then washed with gasoline or kerosene. Bearings that are rust-proof with gas phase, rust-proof water and other water-soluble rust-preventing materials can be cleaned with other soap-based cleaning agents such as 664, flattening, 6503, 6501.

When cleaning with gasoline or kerosene, hold the inner ring of the bearing with one hand and slowly rotate the outer ring with the other hand until the oil on the rolling elements, raceways and cage of the bearing is completely washed away, then clean the outer ring of the bearing. surface. When cleaning, it should also be noted that it should be rotated slowly at the beginning, reciprocating and shaking, and should not be excessively rotated. Otherwise, the raceway and rolling elements of the bearing are easily damaged by the attached dirt. When the number of bearing cleaning is large, in order to save gasoline, kerosene and ensure the cleaning quality, it can be divided into two steps: coarse and fine cleaning.

For inconveniently disassembled bearings, rinse with hot tears. That is, the hot oil is sprayed at a temperature of 90°-100°C to dissolve the old oil, and the old oil in the bearing is dug with an iron hook or a small spoon, and then the residual oil and oil in the bearing are washed away with kerosene, and finally Rinse it with petrol.

The quality of the bearing is checked by hand. After the bearings have been cleaned, observe carefully that there will always be some remaining oil in the inner and outer ring raceways, on the rolling elements and in the gaps in the cage. When testing, first scrape off with the remaining oil of the clean feeler, apply it on the thumb, and slowly slap it back and forth with your index finger. If there is a rustling sound between the fingers, the bearing is not cleaned and should be washed again. Finally, take the bearing on the hand, pinch the inner ring, and push the outer ring to rotate horizontally (large bearings can be placed on the assembly table, the inner ring pad, the outer ring is suspended, the inner circle is pressed, the outer ring is rotated), to rotate Flexible, unblocked, and no bounce is acceptable.

For the cleaned bearings, after adding the lubricant, it should be placed on the assembly table. The bottom pad should be covered with a net cloth or a paper pad, and covered with a plastic cloth for assembly. It is not allowed to be placed on the floor or the box. When moving the bearing, it is not allowed to take it directly by hand. Wear canvas gloves or use a clean cloth to wrap the bearing and then take it. Otherwise, because of the sweat and moisture on the hand, the bearing will easily produce fingerprint rust after contact.

Bearings with dust caps or seals on both sides, and bearings coated with rust-proof and lubricated greases are greased at the time of manufacture, so do not clean them before installation. For example, workers and peasants - type 12, Red Wei - 12 type hand drag and Dongfang red 20 tractor clutch with 51708ZHS (original code 688808) bearing.

2. Cleaning of shaft and housing housing hole and other parts

Wash with gasoline or kerosene first, wipe with a dry cloth, and then apply a small amount of oil to facilitate installation. After cleaning these parts, it should be noted that all types of sand on the castings should be completely removed; if there are burrs on the parts that are matched with the bearings, they must be removed to prevent residual sand and metal debris from falling into the bearing during installation. Assembly quality.

1. Notes

For bearings that can be separated from the inner and outer rings, do not interchange the outer rings to avoid affecting the contact quality. For the self-aligning ball and spherical roller bearing, the rolling elements in the bearing must not be arbitrarily removed and mixed, so as to avoid the disorder of the installation position and affect the accuracy.

When installing the bearing, in order to facilitate the inspection of the bearing code, it is not wrong, the typing surface of the bearing ring should be placed and installed outward.

2. Heating of bearing and housing housing bore

For medium and large bearings with large interference, in order to facilitate the installation, pre-heating must be installed; for the tightly fitting light metal bearing housing hole (such as aluminum bearing housing), the hardness is very low, to prevent the bearing outer ring from being pressed. When the surface of the housing hole of the bearing housing is scratched and pulled, it should be heated and installed. The heating method generally involves placing the bearing or the separate type bearing ring into a fuel tank containing clean engine oil, so that the oil floods the bearing and uniformly heats. When the temperature reaches 80-90 ° C, remove it and wipe it clean. The fuel tank can be made of 2-3 mm thick iron plate, a porous iron plate is placed 50-70 mm from the bottom of the box, and the bearing is placed on a porous iron plate for heating. Its purpose is to prevent deposits of impurities in the oil from entering the bearing.

However, for bearings with dust caps or seals on both sides, since the lubricant has been added in the manufacturing process, it cannot be heated in the early stage of installation.

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Grinding machine static pressure NTN bearing maintenance method

Static pressure NTN bearings have high rotation precision, good rigidity, high bearing capacity, no wear and high durability. The following are some of the experiences of static pressure NTN bearings in the process of repair and try to obtain, for your reference only.

1. Small hole throttle:

(1). Change the internal throttling to external throttling, and add a pressure gauge to instantly display the upper and lower chamber pressure. It is easy to maintain, especially it can be cleaned regularly, which is unmatched by the internal throttle.

(2). Throttling ratio. The theoretical value of the throttle ratio β is between 1.2 and 1.5, and 1.25 is preferred based on years of experience. In this way, the geometric accuracy of the main shaft, the geometrical accuracy of the front and rear bearing pads, the concentricity, the roundness and the taper need to be strictly controlled in order to ensure the β value. The e value (the eccentricity of the main axis and the geometric center of the bearing bush) is determined according to the load carrying capacity of the machine tool to optimize the β value.

(3). When the oil chamber is not equipped with the main shaft, the oil column of each oil outlet must be consistent (observation method). If it is inconsistent, the flow rate should be changed by changing the orifice diameter of the throttle. Taking 4 chambers as an example, the oil column of the lower, left and right chambers is generally between 20 and 25 mm, and the diameter of the small holes is 0.25 to 0.4 mm.

2. Thin film feedback throttle:

The film feedback throttle NTN bearing stiffness is very large, but the machine tool often appears in the operation of the tiling, pulling, falling pressure and so on. The most critical of the film feedback is the film. In practice, the main reasons for the bearing lock and pulling are: 1 plastic deformation of the film; 2 slow feedback. When the external load is abrupt, the shaft and the tile have already rubbed when the film has not reacted; 3 the film is fatigued. The film is used for a long time and fatigue deformation, which is equivalent to changing the feedback parameters.

Increased film thickness and the use of some fatigue-resistant materials can achieve good results. Generally, a rigid film, a preload, and a gap are reserved. The specific method is: change the 1.4mm thick film to a 4mm thick rigid film, and place a 0.05mm thick tin foil in the lower cavity to adjust the spindle to a position 0.05mm higher than the ideal position. The purpose is to return to the ideal center just after the spindle is stressed (grinding weight, cutting force).

3. Improvement of the oil supply system:

In the static pressure NTN bearing oil supply system, except for the coarse filter and the fine filter, the other components have a protective effect on the static pressure NTN bearing. The oil supply system is improved on the basis of the original system.

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Grinding machine static pressure NTN bearing maintenance method

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How to make SKF bearing extended life

Transmission SKF bearing is a kind of central nervous situation in the rigid operation. In order to ensure the normal situation of the transmission shaft, the result of life extension can be extended in this respect. In the utilization, we should make the following points too fine;

1. In order to ensure the dynamic balance of the SKF bearing, the fine balance soldering piece should be desoldered. The new drive shaft assembly is provided with the device logo of the thin telescopic sleeve when the new drive shaft is loaded, and the flange fork should be wrapped in a plane. When repairing and disassembling the drive shaft, the device mark should be printed on the telescopic sleeve and the flange shaft, so that the original device can be stabilized when the device is reinstalled.

2. It is strictly forbidden to start with a high-speed gear.

3. It is strictly forbidden to lift the clutch pedal.

4. It is strictly forbidden to overload the car and speed.

5, should always be added to the universal joint SKF bearing grease, seasonal differences, the use of grease is not the same, such as the summer should be injected with No. 3 lithium-based grease, in winter, the second lithium-based grease.

6. Should check the fastening environment of the drive shaft hanger every time, whether the supporting rubber is damaged, whether the connection parts of the transmission shaft are loose, and whether the transmission shaft is deformed.

7, should always check the situation of the drive shaft.

SKF bearings also have a special environment in this situation. In the face of this aspect of change, all aspects of the situation have affirmative changes, and this day's maintenance role is a kind of handling from this aspect. The situation embodied.

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NSK bearing high temperature and high speed grease performance characteristics

High-temperature high-speed NSK bearing grease: high-temperature thickener thickened synthetic oil, and added multi-effect additives, is a high-quality grease that maintains normal working conditions in high temperature environment for a long time.

Performance characteristics:

The structure is smooth, the fiber is fine, and has high cleanliness. It can suppress the abnormal sound of NSK bearing during operation and meet the long-term operation requirements of high-speed NSK bearing with DN value above 500,000.

Excellent resistance to high and low temperature, lubricity, good colloidal stability and mechanical stability.

Water resistant, resistant to water rinsing and maintaining hardness over a wide temperature range. Excellent anti-oxidation performance, good anti-wear performance, resulting in extremely long service life and 5-10 times the service life of lithium base grease.

Extremely high temperature resistance and high-speed shear resistance make it easy to handle in high temperature and high speed environments.

The operating temperature range is -40 to 230 ° C and the short time is 250 ° C.

Recommended Applications:

It is suitable for lubrication of precision NSK bearings, motor NSK bearings and miniature NSK bearings in high and low temperature environments.

Suitable for lubrication of all kinds of high speed NSK bearings, high speed long life gyro motors, high speed grinders and other high speed instruments and mechanical NSK bearings.

It is suitable for mechanical use where there is a requirement to reduce noise or the environment is extremely harsh, and it is also suitable for lubrication of high temperature parts.

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About

Shandong eworld cnc Co., Ltd. is a high-tech enterprise integrating R&D, production, sales and engraving drawings design. Headquartered in Jinan, Quancheng, the company has a plant area of approximately 4,000 square meters and has a team with extensive experience in mechanical design and development and numerical control applications. The main product series include: woodworking engraving machine, laser engraving machine, stone engraving machine, glass engraving machine, laser cutting machine, flame cutting machine, metal cutting machine, etc.