Life of ultra-thin spheroid bearings

Luoyang Lirui Bearing Co., Ltd.'s strength is long life and high precision. After the ultra-thin squash bearings are on the machine, they are required to stop 24 hours a day, 365 days a year. The fast bearing is 24,000 rpm. It should be transferred to more than 12.6 billion rpm in one year. Under normal circumstances, it can be used normally for 4-5 years. Such a product can be regarded as a qualified product, even if it is 10 billion rpm in 1 year, it is 4-5 billion rpm in 4-5 years. The robot said that you can't use such a long life.

Features and functions of equal-section thin-walled bearings

Isometric thin-walled bearings are made up of seven open series and five sealed series with inner diameters ranging from 1 inch to 40 inches and cross-section sizes ranging from 0.1875X to 0.1875 inches to 1.000X 1.000 inches. There are three types of open bearings: radial contact (L type), angular contact (M type), and four point contact (N type). There are only two types of sealed bearings: radial contact (L-shaped) and four-point contact (N-type). The thin-walled bearings produced by our company are different from the standard bearings. In thin-walled bearings, the cross-sectional dimensions in each series are designed to be fixed values, and the dimensions in the same series are constant. Does not increase with increasing inner diameter size. Therefore, this series of thin-walled bearings, also known as equal-section thin-walled bearings, allows designers to standardize the common parts associated with them. With large bores, thin-walled bearings with small cross-sections can use large diameter hollow shafts, such as air, water pipes, and wires that can be supplied through hollow shafts for a simpler design. Thin-walled bearings save space, reduce weight, significantly reduce friction, and provide good rotation accuracy. Without thin-wall bearings, the design can be reduced without affecting bearing performance and service life. External dimensions and reduced production costs. In 2006, the series of thin-wall bearing products of the same section won the National Torch Plan project commitment unit, and was supported by the National Science and Technology Innovation Project in 2008.

Analysis of Causes of Surface Fatigue Failure Caused by High Temperature of Tapered Roller Bearings

Bearing failure analysis to improve the working surface reliability of the system engineering is an important part of the bearing (the bearing's working function in its specified loss, causing failure or not working as a phenomenon of failure is called (bearing failure can be divided according to them) The normal life failure and two early failures, mainly for the analysis of the causes of early failure of the bearing caused by pitting and fatigue and suggest improvements to improve the life and reliability of TIMKEN bearings. TIMKEN bearing fatigue failure It is a failure surface form, mainly characterized by fatigue crack initiation, expansion and fracture processes, and long-term effects of load failure under alternating metal. Tapered roller bearings use glass fiber reinforced nylon The cage manufactured by 66 is suitable for the steady state of working temperature not exceeding 120 degrees. When the bearing is oil lubricated, if the oil contains additives, the life of the cage may be shortened. When the temperature exceeds 120 degrees, the aging lubrication Oil will also shorten the life of the cage. Therefore, observe and replace the lubricant as scheduled. The sealed TIMKEN bearing is lubricated with a specially tested high quality lithium-based grease that can withstand temperatures of up to 120 degrees in a short period of time. If the stable operating temperature reaches 70 degrees or higher, the life of a standard lithium-based grease Will be shortened. To work frequently at high temperatures, special greases must be used, and care should be taken to use heat-resistant materials as a seal. Standard contact seals should not be used for temperatures up to 110 degrees. If a high temperature synthetic material is used for sealing, consider that this very effective fluorinated material will release harmful gases and fumes at temperatures above 300 degrees, especially when disassembling the tapered roller. This is especially important when using a welding torch for bearings. 1. Tapered roller bearings have a much lower load bearing capacity than sliding bearings of the same size, so the radial size of their rolling bearings is large. In the case of heavy load and where small radial size and compact structure are required (such as crankshaft bearings for internal combustion engines), sliding bearings are often used. 2. Bearing vibration The noise is large, especially in the later stage of use. Therefore, in the case where the precision bearing is required to be high and vibration is not allowed, the sliding bearing is generally better. 3. Tapered rolling The sub-bearing is particularly sensitive to foreign matter such as metal chips. Once foreign matter is mixed, intermittent vibration and noise are generated, which may cause damage. Therefore, the life of the rolling bearing has a certain limit. In short, the life of the TIMKEN bearing is shorter than that of the sliding bearing. Some.

New process method for anti-rust work of rolling bearings

Bearing rust prevention is an important task, especially rust prevention between processes. There are many processes after the bearings are pickled, cleaned and ground in the heat treatment workshop. When the product is not produced by running water, it is stored in the intermediate storage after being processed sequentially, so the bearing rings stored between the processes must be rust-proof. Introduction to new anti-rust process methods After years of joint research with relevant manufacturers, many years of production practice has shown that the anti-rust between processes has been improved several times to adopt the spray-type anti-rust The rust effect is better. Initially, the rust prevention of the roller was tested. The semi-finished product and the finished product were washed once a day with an aqueous solution of sodium nitrite. After 3 months, no rust was found in the test results. Now, the semi-finished product of the bearing ring is sprayed and rust-proof, and the effect is also the same. The spray-type anti-rust process is relatively simple, and the method is as follows: 1. Purchase and construction of equipment According to how much semi-finished product is stored, an intermediate library is built, the ground is cemented, and the middle is A walkway can be set up, about 1.5m, for the trolley that passes through the bearing ring. Place a pool of sodium nitrite solution at the end of the channel. The solution is formulated with 5%-10% sodium nitrite plus 0.6% sodium carbonate. The backwater is made on the ground and the bearing rings are stacked on both sides of the floor. On the top, there is a 0.6m walkway between each pile of bearing rings. It can be said that the intermediate library is designed to be about 64m2, and its sodium nitrite aqueous solution pool is 1m3. 2. Process method Rinse once a day with an aqueous solution of sodium nitrite. The aqueous solution is sucked from the pool by a water pump, passed through the rubber tube to the shower head, and rinses the bearing like a shower. Ferrules. The rinsed aqueous solution flows back to the pool from the backwater ditch, and is placed on the upper layer of the backwater tank at the end of the backwater ditch. A fine wire mesh and gauze are used as a filter to transport the dust and dirt into the pool. The intermediate library should be clean and in good condition. The solution in the pool is tested every 2 days and is supplemented according to the test results. The replacement period of the solution in the pool is carried out according to different months. It is completely changed every 2 weeks from April to September, and October-March. , change once a month. Conclusion The rust-proof rust-proof, easy to manage, and labor-saving, in the past, the intermediate library with 2 people can not complete the rust, now you can also use one person to do other Work is also very noticeable from the rust prevention effect. In March 2003, more than 4,000 rolls of 7002136 and 3620 rollers were sprayed and rust-proof. They have remained very bright for nearly a year and have no rust. In addition, there is a great saving in the consumption of chemicals. In the past, the roller workshop consumed more than 4,000 kilograms of sodium nitrite per month, but now only 200 kilograms is used, saving nearly half. The spray-type rust-proof method has been tested and used by relevant manufacturers in recent years, which proves that it is suitable for medium and large-sized, long-volume, long-cycle bearing semi-finished products.

Improve safety production applications from bearing maintenance and repair to selection of details

1. Bearing maintenance In order to maintain the original performance of the bearing in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity. Economic. 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. As a maintenance item in operation, there are bearing rotation sound, vibration, temperature, lubricant status, and so on. 2, Bearing overhaul Bearing cleaning: When disassembling the bearing for inspection, first record the appearance of the bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, Wash the bearings. As a cleaning agent, a cleaning agent or kerosene is generally used. The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and 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 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. Bearing inspection and judgment: In order to judge whether the removed bearing can be used, it should be checked after the bearing is cleaned. Check the condition of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the bearing clearance, and the damage and abnormality with irrelevant dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring and horizontally rotate the outer ring to check if it is smooth. Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring. Because large bearings cannot be rotated by hand, pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of the bearings, the more careful inspection is required. 3, Bearing Selection Overview of Bearing Selection: Market requirements for various mechanical devices and instruments using rolling bearings are becoming more stringent, for bearings The required conditions and performance are also increasingly diversified. In order to be able to select the most suitable bearing from a large number of structures and sizes, it is necessary to study from various angles. When selecting a bearing, generally, the bearing structure, the ease of mounting and dismounting as a shaft system, the space allowed for the bearing, the size, and the marketability of the bearing are generally considered, and the bearing structure is roughly determined. Secondly, the bearing size is determined while comparing the design life of various machines using bearings and the various endurance limits of the bearings. When selecting a bearing, it is often preferred to consider only the fatigue life of the bearing. The grease life, wear, noise, etc. caused by the aging of the grease also need to be fully studied. Furthermore, depending on the application, it is necessary to select bearings that are specially designed for accuracy, clearance, cage structure, grease, and the like. However, there is no order or rule for selecting bearings. It is especially practical to consider the conditions, performance, and most relevant requirements for the bearings.

Relationship between thin-walled ferrule bearings and deep groove ball bearings, four-point contact bearings and angular contact ball bearings

Thin-walled ferrule bearings can be deep groove ball bearings (C), four-point contact bearings (X), and angular contact ball bearings (E). The above various designs are available in different series. The series depends on the size of the cross section. The ball matches the series. Deep groove ball bearings can support both axial and radial loads. Four-point contact bearings can support bidirectional axial loads as well as radial loads; therefore they operate in the same way as double row angular contact ball bearings. Angular contact ball bearings can match an optimal number of balls and have a contact angle of 30°. They support higher radial loads than deep groove ball bearings or four-point contact bearings and can support axial loads originating in the same direction. Angular contact ball bearings are also available as mating bearings for special needs. Therefore, the rigidity and load carrying capacity of these combinations are much higher than for single bearing products.

Thin-walled ferrule bearings can achieve multiple functions depending on the design

Thin-walled ferrule bearings are highly accurate, very quiet and have a high load carrying capacity. These ball bearings are available in three designs and are extremely small and mostly square in cross section. In these series, even with larger shaft diameters and bearing bores, the cross section remains the same. These bearings are therefore referred to as equal sections (CS). It is this feature that distinguishes thin-walled ferrule bearings in the standard ISO series from conventional bearings. Therefore, you can choose a larger cross section and use a more load bearing without having to change the shaft diameter. Thin-walled ferrule bearings can be designed to be extremely light and require very little space.

Stainless steel thin-walled ball bearing features and application fields

LRZ stainless steel thin-walled ball bearings are rust-proof and corrosion-resistant. They are suitable for use in wet, underwater and other rust-resistant and corrosive media environments. LRZ stainless steel thin-walled ball bearings have the same rolling elements and ferrules as other series of bearings, but the materials are made of stainless steel and equipped with corresponding seals and retainers. They can also withstand radial, axial and overturning forces depending on the structure. Stainless steel thin-walled ball bearings have flexible rotation, stable operation, friction torque is much smaller than sliding bearings, and have a long service life. However, the overall load carrying capacity is slightly smaller than that of ordinary bearings. LRZ stainless steel thin-walled ball bearings mainly include large deep groove ball thin-walled bearings and four-point thin-walled ball bearings. The seal structure can be opened and closed for users to choose.

Bearing contact fatigue strength linear and bearing wear resistance

The contact fatigue strength of the bearing is related to the wear resistance of the bearing, the hardness of the bearing steel, the rust resistance of the bearing steel, and the processing performance. First, the cracking and spalling of the bearing is caused by the cyclic load of the bearing, and the contact surface is prone to fatigue damage. Therefore, in order to improve the service life of the bearing, the bearing steel must have high contact fatigue. strength. Second, wear resistance The wear resistance of bearing steel is good and bad, which directly affects the sliding friction between the ferrule, the rolling element and the cage when the bearing is working, so that the bearing parts Constant wear and tear In order to reduce the wear of parts during bearing work, maintain bearing accuracy and stability, and extend service life, better bearing steel must be used as the material. III. Hardness Hardness is one of the important qualities of bearing quality and has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the bearing steel in the use state generally reaches HRC61~65, in order to obtain high contact fatigue strength and wear resistance of the bearing. IV. Anti-rust performance In order to prevent corrosion and rust of bearing parts and finished products during processing, storage and use, bearing steels are required to have good anti-rust properties. V. Processing performance Bearing parts are subjected to many cold and hot processing steps in the production process. In order to meet the requirements of high volume, high efficiency and high quality, bearing steel Should have good processing properties. For example, cold, thermoforming properties, machinability, hardenability, and the like. Common materials for bearing parts are: high carbon chromium bearing steel, carburized steel (such as 20Cr2Ni4A, 15Mn, 20Cr2MnMoA), high temperature bearing steel (such as Cr4Mo4V, Cr14Mo4, Cr15Mo4V, W18Cr4V), stainless bearing steel (9Cr18, 9Cr18Mo, 1Cr18Ni9Ti), vacuum degassing steel, anti-magnetic bearing steel, etc., the most commonly used is high carbon chromium bearing steel. The basic steel grades of high carbon chromium bearing steels are GCr6, GCr9, GCr9SiMn, GCr15, GCr15SiMn. It is the most widely used and most used steel in the bearing manufacturing industry in China. It has good wear resistance and contact fatigue performance. Ideal processing performance with a certain degree of flexibility and toughness. In addition to the above basic requirements, bearing steels should also meet the requirements of proper chemical composition, uniform internal organization, less non-metallic inclusions, internal surface defects meeting the standard and surface decarburization layer not exceeding the specified concentration. The project has clear regulations in the raw material standards.

Introduce the damage of precision bearings, pay attention to prevent rust, insufficient lubrication, current and other reasons

There are many causes of bearing damage, such as improper installation, dirt intrusion or moisture intrusion, which are common causes of early damage to many imported bearings. Not all damaged imported bearings can be repaired, but for each damaged inlet bearing, the cause and extent of damage must be evaluated to avoid or reduce re-damage before considering repairing or replacing a new bearing. The following are some common causes of damage to large-size imported bearings and the corresponding precautions to extend the life of imported bearings. A. Improper installation, operation or disassembly may cause deformation or defect of the cage. Precautions: Use appropriate handling, installation and removal tools B. Insufficient lubrication: insufficient lubrication Or improper use may result in component scratches or severe bearing deformation precautions: Improve the lubrication system and properly replenish or replace the lubricant at regular intervals. C. Rusting and Corrosion Contact with water may cause corrosion and rusting of the shaft components. Bearings after corrosion damage may cause spalling precautions during work, regular inspection of seals, good sealing effect, proper storage of bearings D. Current Energization of imported bearings when rotating may cause grooves or nicks . Improper grounding of the electrical drive when the bearing is stationary can result in minor burn precautions. Reduce the current flow through the bearing by appropriate grounding connections before welding the components outside the bearing. E. External material Abrasion particles and debris Intrusion may lead to wear and tear on the working face of the bearing, scratches and dents, remove invading particles and debris, replace the lubricant, check the sealing system F. Eccentricity Eccentricity, tilt or excessive load may cause geometric stress Concentration or surface peeling

Deep groove ball bearing model knowledge introduction