Needle Bearing Factory

Bearings are important components in vehicles and play a vital role in the operation of vehicles. In many cases, vehicle bearings will have certain failures. China Bearing Network (referred to as: Bearing Network) will share a typical failure of vehicle bearings-peeling phenomenon. And tell everyone how to better test the quality of the bearings, so that the bearings are safer to use.1. Typical failure of vehicle bearings - peeling phenomenon.After decomposing the faulty bearing, it was observed that the working surface of the bearing roller was peeled off, but the edge of the roller was dropped. The working surfaces of the inner and outer rings of the bearing also had metal flakes, and pits also appeared on the working surfaces of the inner and outer rings in contact with the edge of the rollers, as shown in Figures 1 and 2. The bearing cage has also been severely damaged and broken, and plane scars have appeared on the upper plane of the cage.2. Cause analysis of bearing failureFor the analysis of the damage characteristics of the bearing, the basic reasons for the bearing failure mainly include the following aspects:1) Contact fatigue damage.2) The bearing is subjected to abnormal loads such as excessive contact load or impact load. For example, when the molten iron car is subjected to a large impact load during desulfurization or hanging tank operations; The effect of the load.3) Improper bearing assembly or too small clearance, resulting in excessive additional contact stress between components.4) Poor lubrication. Due to the harsh maintenance environment of metallurgical enterprises, iron slag, cotton yarn, dust and other foreign matter are mixed into the lubricant during bearing maintenance.3. Measures to improve the quality of bearing inspection1) Appropriate selection of bearing clearanceClearance is an important factor for the normal operation of rolling bearings, and it is divided into axial clearance and radial clearance. Choosing an appropriate clearance can make the load reasonably distributed among the rolling elements of the bearing, limit the axial and radial displacement of the shaft (or shell), and ensure the rotation accuracy of the shaft; it can make the bearing work normally under the specified temperature; Reduce vibration and noise, which is beneficial to improve the life of the bearing. Therefore, when selecting a bearing, an appropriate bearing clearance must be selected. The selection of bearing clearance should consider the working conditions of the bearing, such as load, temperature, speed, etc.2) Improve the quality of bearing assembly①Matching and measuring link: When assembling the bearing, making the correct matching is an important factor to ensure the reasonable bearing clearance, but the current measurement means and tools are very single, and it is impossible to accurately match the bearing. Purchasing more advanced measurement tools at present; after the bearing is assembled, it needs to go through the process of clearance measurement, but it has not yet been implemented due to the limitations of tools and measurement technology. It is recommended to add this process.②Operation inspection link: After the bearing is installed, it should be inspected to ensure that the bearing is installed in place, the rotation is flexible, and there is no stagnation. If the bearing is installed improperly, the temperature of the bearing will rise rapidly and be damaged, and even major accidents such as bearing seizure and fracture will occur. It is recommended to increase the bearing running and inspection process.3) Improve bearing maintenance and storage environment① Overhaul environment: Due to the particularity of the overhaul environment of metallurgical enterprises, there are a lot of iron dust and dust in the overhaul environment, so when the bearing is overhauled, the surrounding environment should be kept clean and free from hand sweat and dirt.②Storage environment: Bearings should not be stored directly on the ground (more than 30cm above the ground), avoid direct light and cold walls. In order to prevent rust, store in an environment with a temperature of about 20°C and a humidity of less than 65%. Bearings placed in acidic air are prone to rust and discoloration, so it is necessary to strengthen bearing storage management to ensure that new bearings are not damaged by external factors.4) Standardized disassembly and assembly of axle boxesAt present, the maintenance work of bearings is relatively extensive, especially in the process of disassembling and assembling the axle box. Sometimes a sledgehammer is used to strike, which may cause internal damage to the bearing and shorten the working life of the bearing. Therefore, while strengthening the management of bearing maintenance, it is necessary to Actively go deep into the front line to understand the situation, effectively improve the problems found, develop corresponding maintenance tooling, and improve the quality of bearing maintenance.5) Eliminate the loading of inferior bearings from the source①External packaging inspection: In general, genuine factory brands have their own dedicated designers to design the external packaging, and arrange factories that pass the production conditions to produce and produce. Therefore, the packaging is very clear from the lines to the color blocks.②Steel printing inspection: Usually, the bearing body is printed with brand words, labels, etc., and the fonts are very small. However, most of the products produced by the original factory use steel printing technology, and the characters are embossed before heat treatment, so although the fonts are small, they are deeply concave and very clear. The fonts of counterfeit products are not only blurry, but also have rough printing techniques, floating on the surface, and can even be easily erased by hand.③ Rotation check: hold the inner sleeve of the bearing with the left hand, turn the sleeve with the right hand to make it rotate, and listen for noise. Due to the backward production conditions of most counterfeit products, or even completely manual workshop operation, it is inevitable that sundries such as sand will be mixed into the bearing body during the production process, so there will be noise when rotating. This is the biggest difference from genuine factory brands that strictly enforce production standards and operate with machines.④Surface quality inspection: Since the current anti-rust technology in China is not particularly qualified, it is easy to leave thick oil stains when anti-rust treatment is carried out on the bearing body, which is sticky and sticky when held in the hand. There are almost no traces of anti-rust oil on the bearings. A particularly careful expert said that the imported bearings smell a certain smell, and there must be anti-rust oil, but they cannot be seen.

1. The present invention relates to the technical field of automobile clutches, in particular to a driven disc assembly.Background technique:2. The inner ring of the car is another part of the clutch, which transmits the torque of the engine to the transmission through friction conversion, reduces the vibration and impact of the drive train, and completes the tasks of "disengagement" and "combination". The inner ring of the automobile clutch is an essential consumable part of the manual transmission step-change car. When in use, the driven disc assembly transfers the torque of the engine to the transmission through friction conversion. At present, most clutch driven disc assemblies on the market use Friction plates made of organic friction materials, when the car starts with too much energy or overloads, it is easy to cause the friction plates to burn out; secondly, it is affected by the material and manufacture of the friction plates.3. In the prior art, the strength of the inner ring of the clutch is relatively low, so that when the clutch is hit by a collision, the inner ring is prone to collision damage, thereby shortening the service life; on the other hand, the wear resistance of the existing clutch inner ring is poor, It is subject to friction for a long time during use, which is prone to friction damage and shortens the service life.4. Chinese patent cn201811374803.8 discloses "a clutch driven disc assembly with a reinforced protective device", which includes a large steel plate of the clutch driven disc, a clamping disc and a clutch reinforcement plate. The clutch reinforcement plate is set close to the engine flywheel The large steel plate of the clutch driven plate assembly on one side is fixed together with the large steel plate of the clutch driven plate assembly and the clamping plate through rivets.Based on the ordinary clutch driven plate assembly, this technology installs a clutch reinforcing plate on the side close to the engine flywheel, and uses riveting to fix the large steel plate of the clutch driven plate assembly and the clutch reinforcing plate together. Strengthen the axial rigidity and strength of the clutch driven disc assembly, reduce the failure rate caused by stiffness and strength and improve the wear resistance of the clutch driven disc assembly, but the traditional split wave plate is still used when using, which will cause The heat dissipation effect of the driven plate assembly is not good, which leads to the burning of the friction plate.\

Nitrile rubber:  Nitrile rubber is a common sealing material. It is a rubber synthesized from acrylonitrile and butadiene. It has good resistance to the following media.  Most mineral oils and mineral oil-based greases  General fuels such as gasoline, diesel and light heating oil  Animal oils, vegetable oils and fats  Hot water   Nitrile rubber seals also allow the bearing to run without oil for short periods of time. The allowable operating temperature range is -40 to 100°C. It can withstand temperatures up to 120°C for a short period of time. But it is not suitable to run at higher temperature, because the nitrile rubber will harden.Hydrogenated nitrile rubber  HNBR has more wear-resistant properties than nitrile rubber, so the seals made of this material have a longer working life. In addition, hydrogenated nitrile rubber has stronger resistance to heat, aging and hardening in hot oil or ozone. Hydrogenated nitrile rubber allows a maximum working temperature of 150°C, which is much higher than that of nitrile rubber.  fluororubber  The main characteristics of fluorine rubber are high temperature resistance and chemical corrosion resistance, and good anti-aging and anti-ozone properties, and the gas permeability is also very low. Even under very harsh working conditions, fluororubber still has excellent wear resistance. It can withstand operating temperatures of 200°C or below. Seals made of this material allow the bearing to run without oil for short periods of time.Viton also has excellent resistance to various media including oil and hydraulic oil, fuel oil, lubricants, inorganic acids, aliphatic and aromatic hydrocarbons, etc. Viton should not be used in the presence of compounds such as esters, ethers, ketones, certain amines and high temperature anhydrous hydrogen fluoride. If the seals made of fluorine rubber are exposed to open flame or high temperature above 300 ℃, it will be harmful to health and environment! Even when cooled, they are dangerous.  Seals are important for lubricant cleanliness and bearing life.  The role of the seal is to prevent the loss of lubricant and prevent contamination from entering the space that needs to be protected.  Seals have the following properties:   Have sufficient deformation capacity to compensate for irregular surfaces   Have enough strength to withstand the pressure of work   Capable of withstanding a wide operating temperature range  Chemical Resistance  Operates with minimal friction, frictional heat and wearWhat material are bearing seals made of?   Bearings with shields or seals on both sides are already filled with grease and generally require no maintenance.   Shielded bearings are suitable for applications in dry conditions and relatively clean operating conditions. Dust caps are also suitable for applications requiring low friction, such as high rotational speeds or high temperatures.  The dust cover is generally made of metal.  What material is the bearing seal made of?  Bearings with contact seals are suitable for applications with a general degree of contamination, moisture or humidity, or where long service life and long-term maintenance-free conditions are required. Seals are generally made of rubber.

According to the ISO grading standard, it is divided into: P0, P6, P5, P4, P2. The grades increase in turn, of which P0 is ordinary precision, and other grades are precision grades, which are so-called precision bearings. The precision grades and material properties of precision bearings are different. It is more beneficial than ordinary bearings. Based on the analysis of precision bearings, Zhonghua Bearing Network will tell you the difference between precision bearings and ordinary bearings, the use requirements of precision bearings, and how WXING bearings are precise and reliable?The difference between precision bearings and ordinary bearings:1. The size requirements are different, and the dimensional deviation (inner diameter, outer diameter, ellipse, etc.) of products with high precision grades is smaller than the required value of products with low precision grades;2. The required value of rotation accuracy is different. The rotation accuracy (inner radial runout, outer radial runout, end-to-raceway runout, etc.) of products with high precision grades is stricter than that required by products with lower precision grades;3. The required values of surface shape and surface quality are different. The surface shape and surface quality of products with high precision grades (surface roughness of raceways or channels, circular deviation, groove shape deviation, etc.) are lower than those with low precision grades. The value required by the product must be strict;4. The material properties of products with particularly high precision grades are more favorable than those of products with general precision grades.In general, the requirements of precision bearings for accessories:1. The roundness of the shaft and seat hole and the verticality of the shoulder should be required according to the corresponding precision of the bearing.2. It is necessary to accurately calculate the interference fit of the rotating ferrule and the appropriate fit of the fixed ferrule.The amount of interference of the rotating ring should be as small as possible. As long as the influence of thermal expansion at the working temperature and the influence of centrifugal force at the highest speed are ensured, it will not cause creep or sliding of the tight fit surface. According to the size of the working load and the size of the bearing, the fixed ring selects a very small clearance fit or interference fit. Too loose or too tight is not conducive to maintaining the original and accurate shape.3. If the bearing is operated at high speed and the working temperature is high, special attention should be paid to the fit of the rotating ferrule not being too loose to prevent eccentric vibration, and the fit of the fixed ferrule to avoid gaps to prevent the ferrule from being under load. Deforms and excites vibrations.4. The condition for adopting a small interference fit for the fixed ring is that both sides of the mating surface have high shape accuracy and small roughness, otherwise it will make installation difficult and disassembly more difficult. In addition, the influence of the thermal elongation of the spindle needs to be considered.5. The main shaft using paired double angular contact ball bearings is mostly light-loaded. If the fit interference is too large, the internal axial preload will be significantly larger, causing adverse effects. The main shaft using double-row short cylindrical roller bearings and the main shaft of tapered roller bearings have relatively large loads, so the fit interference is also relatively large.NSK has developed countless new types of bearings to meet the needs of users all over the world, and has made great contributions to industrial development and technological progress. At the same time, relying on its technical advantages in precision machining, WXING continues to develop high-end, precision and cutting-edge products such as auto parts and precision mechanical components, and actively develops diversified operations in the fields of electronic applications.WXING bearing research and development technology:4. Analysis technologyNSK's analysis technology, which contributes to the design and development of high-function and high-reliability products, and the construction of efficient production systems, is advancing towards sophistication. In addition, for tests that require high precision and tests that are difficult to evaluate, WXING realizes the method of virtual tests with computer simulation experiments, and promotes the improvement of product development speed by further improving the level of analysis technology.How does WXING bearing achieve precision and reliability?Home appliances such as refrigerators and washing machines, automobiles, airplanes, large-scale industrial machinery, space stations, and many other things used in the world are equipped with bearings. With the slogan of "beautiful and infinite operation and control", WXING provides various products such as auto parts and precision machinery products to the world in addition to various bearings. Based on the technology honed in the field of bearings, WXING is pursuing the possibility of development in various technical fields. WXING bearings are durable and have a wide variety of bearings that can achieve long life even under harsh working conditions such as mines and engineering sites.As one of the important components to ensure the safe operation of railways, bearings for railway trains must have extremely high reliability.1. Tribological technologyCompared with the automatic design of supporting rotary motion and reciprocating motion, lubrication is required to improve its high-speed, quiet sound, load resistance, and durability. nsk uses high-level lubricating technology in the design of grease and solid lubricants, surface processing research, etc., and plays a playful role in products.2. Material technologyIn order to improve product function and durability, as well as the low production efficiency of industrial offices and high schools, nsk focuses on material cost, heat treatment, design performance and analysis and evaluation, and actively strives to improve material technology. The honed material technology is effectively used for high longevity and high reliability for various purposes such as trains and industrial machinery.3. Mechatronics TechnologyNSK's unique mechatronics technology, which combines mechanical elements and electronic elements, is effectively applied to high-function motors, control technology, induction technology, high heat resistance, high density, high reliability mounting technology, and biomedical micro-electromechanical systems. systems technology etc.