The bearing runs inside and outside, that is, the bearing runs inside and outside the ring. Pitting process The pitting repair process is an emergency measure. The bearing room is pitted or knurled. The bearing and the shaft (hole) fit very tightly, generally an interference fit, and in a few cases a transition fit. 1.5-2mm, curing at room temperature for more than 24h, processing on the lathe, the tolerance is controlled within In the H6 range, the roughness is 1.

 

This measure has a wide range of applications and can be used in large and small bearing chambers.1.) to heat powdered or filamentous metal or non-metallic materials to a molten or semi-molten state, and then spray it at a certain speed with the help of flame itself or compressed air A technology in which the surface of the pretreated substrate is deposited to form a surface coating with various functions. If you can’t buy the end cap of the original machine for various reasons, you can use the original end cap as a model,tensioner bearing kit manufacturers sand casting or steel plate welding blank, pay attention to repairing the sand mold to leave the machining allowance of the metal processing part and the shrinkage of the casting cooling. Solei carbon nano polymer repair technology Soleil carbon nano polymer material repair technology is a kind of 'cold repair' technology, which can implement offline machining repair, or implement on-site online repair, which is more flexible in application.

 

Fitting tolerance: There are strict standards for the fitting tolerances of bearings and shafts (holes). This measure is one of the most ideal repair programs. After cleaning the dust and other debris, you can reinstall it. The inner diameter and length of the steel sleeve are reserved for the machining allowance after nesting. As long as the basic mechanical strength of the shaft head meets the use, it can be repaired by this technology. Pay attention to ensure that the arc surface of the rubber strip is slightly higher than the cylindrical surface in the bearing chamber. 2. Machining accuracy and installation accuracy: refers to the technical parameters of shaft, bearing, bearing seat hole processing tolerance, surface roughness, installation and assembly accuracy.

 

Under the torsion force, the shaft (bearing) will break the static between each other and cause sliding. If either aspect is not good, the bearing may run into circles. The interference between the bearing and the shaft is insufficient, resulting in insufficient friction between the bearing and the journal and running the inner ring. The inner diameter tolerance is controlled at H6, and the roughness is 1.

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Half-round key connection The first structural feature is that the keyway on the shaft is machined with an external disc milling cutter with the same radius as the key size. The working principle of flat key connection: key side extrusion, key shear transmission torque 3) Wedge key connection Advantages: It can play a one-way axial fixation role on the hub or bear a one-way axial load.

Good neutrality and high cost (processing by special equipment). When the mating surface is a cylindrical surface, the press-in method or the temperature difference method (heating the contained part or cooling the contained part) can be used for assembly. There are many ways to connect the shaft and hub, the most common and widely used are key connection, spline connection, pin connection, interference connection and so on. Flat key type: A-type flat key, B-type flat key, C-type flat key.

Although the connecting parts have no weakened keyway, the stress concentration at the edge of the mating surface is greater. Second, the function of shaft hub connection Transmission torque; fixation and positioning. China Clutch Release Bearings factory \tworking principle: The reason why interference coupling can transmit load is that the parts have elasticity and the coupling has assembly interference. At the same time, there is a gap between the top surface of the key and the hub keyway during assembly, which does not affect the centering of the hub and the shaft, so the neutrality is better, so it is used widely.

Higher and inconvenient assembly.1. Advantages of flat key connection: Ordinary flat key connection has the advantages of simple structure and convenient assembly and disassembly. Interference connection Interference connection uses the fit interference between parts to achieve connection.. Which assembly method is used is determined by the factory equipment conditions, the amount of interference, and the structure and size of the parts.

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Industrial sewing machine bearings are also lubricated with grease, and there are no special requirements for oil and water resistance. The axial size of the ring seal groove (the axial position of the seal groove) has a great influence. Comparing the groove contact seal structure in Fig.1. Therefore, the interference between the sealing ring lip and the inner ring sealing groove of this structure has a large dispersion. 2 for motorcycle engine case bearings. 1 to Fig. 1 is that the inner ring of the bearing does not have a seal groove and the sealing route is short, which is not conducive to sealing. Therefore, the requirements for the anti-leakage sealing performance of this type of bearing are very high, and the bearing must adopt a contact seal structure.

According to the different sealing materials, they are mainly divided into two types: rubber sealing ring and dust cover (standard iron cover): according to different seals, they can be divided into contact sealing and non-contacting seal. 4, the difference is that the structure of Fig. For sealed deep groove ball bearings such as motorcycles, home appliances motors, luxury ceiling fans, etc. Therefore, the sealing performance of the non-contact dust cover sealing structure of FIG. For example, the sealing grooves of precision low-pitched automotive bearings produced by some domestic bearing manufacturers are grinded with a shaped grinding wheel, which greatly improves the processing accuracy of the sealing groove and the accuracy of matching with the sealing ring, so that the sealing performance of the bearing

The quality of vibration and noise has been significantly improved. 5 uses a dust cover. At the same time, due to the better roughness of the outer diameter grinding of the inner ring, the friction torque of the bearing under the same sealing effect is smaller than that of the groove contact seal structure in Figure 1. For example, a single-sided sealed motorcycle engine case bearing is lubricated by splash lubrication by the engine oil in the engine when the engine is working. The sealing ring lip either has too little contact deformation, which affects the sealing effect, or the contact deformation is too large, increasing the contact surface The frictional torque and bearing rotating torque caused the vibration and noise to increase and the temperature rise too high and too fast when the bearing was working.

Since this structure requires high processing precision of the sealing ring and the sealing groove of the ferrule, and high production cost, it has not been widely adopted. 2 has the following four advantages: (1) The inner ring does not have a sealing Mechanical ball bearing manufacturers groove, so the processing cost is lower; (2) The sealing ring lip With the grinding inner and outer diameters, the interference is smaller; (3) The friction torque is smaller under the same sealing effect; (4) Under the same friction torque and the same oil pressure on the inner side of the sealing ring, the sealing ring lip The contact surface with the inner ring is not easy to separate, which is very advantageous for the sealing under pressure on the inside of the bearing seal ring.

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It can be used as a user to recheck the axial direction of double-row tapered roller bearings on site.” The foreign company’s “protrusion method” measuring instrument is equipped with a counterweight device to measure different sizes When double and four-row tapered roller bearings have axial clearance, the counterweight can be adjusted to meet the measurement requirements.

Fourth, the conclusion JB/T8236—2010 stipulates that “load blocks are added to the outer ring during measurement, and the load value should ensure that the rolling elements are in uniform contact with the raceway. Manufacturers and users of the main engine have explored various alternative measurement methods in practical applications. The users of the main engine often need to recheck the axial clearance and measure the double and four-row tapered rollers in accordance with the standard 'split method' When bearing axial clearance, a height gauge is used to determine the distance between the end face of the ring and the measurement platform.

The 'whole method' is currently an alternative measurement method widely used by users of the main engine. The manufacturing principle of the counterweight device is also very simple, and can be manufactured by ordinary bearing manufacturers.4 times that of the 'protrusion method'. This is due to the 'integral method' measurement, due to the self-locking problem of the next row of rolling elements, the gap measurement value is greater than its actual value, resulting in the actual clearance of the bearing when the clearance configuration is greater than the true value. The 'protrusion method' is a measurement method with accurate measurement and high measurement efficiency. The requirements for Wholesale Mechanical ball bearing manufacturers the bearing test platform are high, and it is difficult for users to achieve it on site.

Some foreign companies have adopted the 'projection method' when measuring the clearance of double and four-row tapered roller bearings without spacers, and have developed special measuring instruments, as shown in Figure 1. , Improve measurement accuracy, and then make beneficial improvements for bearing rotation accuracy increase, vibration reduction, and life extension.

The difference in the measured values ​​obtained by different measurement methods forces bearing manufacturers to increase the axial clearance value to 'match' the user's measurement method when configuring the clearance, causing the actual bearing clearance to be greater than the measured value, thereby reducing the rotation accuracy of the bearing and increasing the bearing Vibration and noise during operation will eventually reduce bearing life. Three, data analysis The measured data of the three measurement methods are shown in Figure 3. To sum up, learn from the principle of the foreign company's 'protrusion method' measuring instrument, make simple tooling to carry out double and four-row tapered roller bearing axial clearance test experiments, and compare and analyze the results obtained by different measurement methods.

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Improving the cleanliness of bearing steel, especially reducing the oxygen content in the steel, can significantly extend the life of the bearing. The US Naval Research Institute (NSP) conducted a 650°C warm processing test on 52100 steel and showed that no fracture occurred at a true strain of 2.

Developed high-frequency hardening bearing steel, using ordinary medium carbon steel or medium carbon manganese, chromium steel, through high frequency heating and quenching to replace ordinary bearing steel, which not only simplifies the production process, reduces costs, and increases the service life. In the late 1980s, the advanced level of Japan's Sanyo Special Steel Company was 5.

Due to the increasing use of bearings in environments with high temperature, corrosion, and harsh lubrication conditions, bearing steels such as M50 (CrMo4V) and 440C (9Cr18Mo) ​​used in the past can no longer meet the requirements of use. After rolling, air cooling and short-time annealing are adopted, or the spheroidizing annealing process is completely eliminated, and qualified bearings can be obtained Steel organization.

In terms of heat treatment, progress has been made in improving the qualit ynon-standard bearings suppliers of spheroidizing annealing, obtaining fine, uniform and spherical carbides, and shortening the annealing time or eliminating the spheroidizing annealing process In the guidance work, the division of labor is responsible for guidance. The main content of the search is based on the principle of adhering to the 'three key points', and mainly searches for the possibility of subjective and deliberate embezzlement, misappropriation, or the loss of company assets during the operation of power. It is a quantitative change.　　　　

The activity implementation plan made detailed arrangements for the procedures and methods for finding risk points, as well as specific implementation steps and time limits.　　　　 

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Solving the environmental pollution problem of heat treatment and implementing clean heat treatment (or green heat treatment) is one of the development directions of heat treatment technology in developed countries. Energy-saving heat treatment: Scientific production and energy management are the most potential factors for the effective use of energy.The quality of heat treatment is directly related to the quality of subsequent processing and ultimately affects the performance and life of parts. The finishing allowance after heat treatment is reduced, which improves material utilization and machining efficiency. At the same time, heat treatment is a major energy consumer and a major polluter in the machinery industry. In order Wheel Bearing manufacturers to reduce the emissions of SO2, CO, CO2, dust and coal slag, the use of coal as fuel has been basically eliminated, and the use of heavy oil is becoming less and less.

Precision heat treatment: Precision heat treatment has two meanings: on the one hand, it is based on the use requirements, materials, and structural dimensions of the parts, using physical metallurgy knowledge and advanced computer simulation and testing technology to optimize the process parameters to achieve the required Performance or maximize the potential of the material; on the other hand, the stability of the optimized process is fully guaranteed, and the product quality dispersion is very small (or zero) and the heat treatment distortion is zero. The waste heat utilization of the combustion furnace has reached a high level.

Non-oxidation heat treatment: By using protective atmosphere heating instead of oxidizing atmosphere heating to precise control of carbon potential and nitrogen potential, the performance of parts is improved after heat treatment, and heat treatment defects such as decarburization and cracks are greatly reduced.. Most people switch to light oil, and natural gas is still the most ideal fuel. In recent years, with the progress of science and technology and its application in heat treatment, the development of heat treatment technology is mainly reflected in the following aspects: (1): Heat treatment: waste water, waste gas, waste salt, dust, dust, etc. Vacuum heating gas quenching, vacuum or low-pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality, reduce distortion and increase life.

The establishment of a professional heat treatment plant to ensure full-load production and give full play to equipment capabilities is the choice of scientific management. The optimization of the burner structure and the strict control of the air-fuel ratio ensure that the NOX and CO are reduced to a minimum under the premise of reasonable combustion; gas carburizing and carbonitriding are used And vacuum heat treatment technology replaces salt bath treatment to reduce the pollution of waste salt and CN-containing toxic substances to water sources; uses water-soluble synthetic quenching oil to replace part of quenching oil, and uses biodegradable vegetable oil to replace part of mineral oil to reduce oil pollution. formed in the heat treatment process Noise and electromagnetic radiation will pollute the environment. In terms of heat treatment energy structure, priority is given to primary energy; waste heat and waste heat are fully utilized; processes with low energy consumption and short cycles are used instead of processes with long cycles and high energy consumption

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