1, the vibration of the bearing
Bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, rust, crack, wear, etc. are reflected in the bearing vibration measurement. Therefore, vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.). The size of the frequency can not be inferred from the specific circumstances of the abnormality. The measured value differs depending on the conditions of use of the bearing or the position at which the sensor is mounted. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
2, the temperature of the bearing
The temperature of the bearing, generally the temperature outside the bearing can be inferred. If the oil hole can directly measure the temperature of the bearing outer ring, it is more suitable.
Usually, the temperature of the bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.
The thermal sensor can be used to monitor the operating temperature of the bearing at any time, and automatically alarm or stop the occurrence of a burning shaft accident when the temperature exceeds the specified value.
The high temperature often indicates that the bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes the bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.
Therefore, it is necessary to continuously monitor the bearing temperature, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.
The periodic measurement of the bearing temperature can be carried out by means of a thermometer, such as a skf digital thermometer, which accurately measures the bearing temperature and displays it in °C or Fahrenheit.
The importance of the bearing means that when it is damaged, it will cause the equipment to stop. Therefore, it is better to install a temperature detector for this type of bearing.
Under normal conditions, the bearing will naturally rise in temperature after lubrication or relubrication and last for one or two days.
2018年12月5日星期三
Rolling bearing hardness
Regarding the hardness of the bearing, the inner and outer rings of the rolling bearing and the rolling elements are made of high-chromium steel GCr15 or GCr15SiMn bearing steel. The hardness of the finished bearing ring is in Rockwell HRC60-65; the hardness of the finished bearing rolling element is in Rockwell HRC60-66. Among them, the hardness of the steel ball made of GCr15 bearing steel is in the range of Rockwell HRC62-66; the hardness of the roller made of GCr15SiMn bearing steel is in the range of Rockwell HRC60-64 and steel ball in Rockwell HRC60-66. Maybe you don't know what Rockwell hardness HRC is. For example, the hardness of the blade of a household kitchen knife is generally around HRC50. The steel of surgical tools and military cutters should be pure and the hardness is also within the Rockwell HRC60. . The hardness of the alloy cutter head for machine tool metal turning is also about 62 to 65 in Rockwell HRC. The hardness of the rolling bearing is relatively hard, and the finished bearing needs to be further processed with special equipment and tools.
2018年12月4日星期二
The cause of abnormal damage to the hub bearing
During the maintenance process, it is often found that some vehicles have large running noise, and the tires are checked for no abnormal wear, and there is no obvious abnormal sound when the wheels are turned on the lift.
This phenomenon is often caused by abnormal damage of the hub bearing. The so-called abnormality refers to the bearing damage caused by the installation.
The front wheel bearing of a car is generally a double row ball bearing. If the hammer is used for the installation when the bearing is installed, or when the bearing is installed into the bearing housing, the inner ring of the bearing is installed by the pressure bearing inner ring. damage. Noise is generated when the vehicle is running, and no significant noise is heard when the wheel is off the ground due to the better side of the raceway. Proper installation is the key to long bearing life
This phenomenon is often caused by abnormal damage of the hub bearing. The so-called abnormality refers to the bearing damage caused by the installation.
The front wheel bearing of a car is generally a double row ball bearing. If the hammer is used for the installation when the bearing is installed, or when the bearing is installed into the bearing housing, the inner ring of the bearing is installed by the pressure bearing inner ring. damage. Noise is generated when the vehicle is running, and no significant noise is heard when the wheel is off the ground due to the better side of the raceway. Proper installation is the key to long bearing life
2018年12月3日星期一
Radial spherical bearing model
(1) GE...E type: single outer ring, no lubricating oil groove. Can withstand radial loads and small axial loads in either direction.
(2) GE...ES type: single-slit outer ring with lubricating oil groove. Can withstand radial loads and small axial loads in either direction.
(3) GE...ES-2RS type, GEEW...ES-2RS type: single-slit outer ring with lubricating oil groove and sealing ring on both sides. Can withstand radial loads and small axial loads in either direction.
(4) GE...ESN type: single-slit outer ring, GE...XSN type: double-slit outer ring (split outer ring), with oil groove, and outer ring with stop groove. Can withstand radial loads and small axial loads in either direction. However, when the axial load is received by the retaining ring, its ability to withstand axial loads is reduced.
(5) GE...HS type: There are lubricating oil grooves in the inner ring and double outer rings. The clearance can be adjusted after wear. Can withstand radial loads and small axial loads in either direction.
(6) GE...DE1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. Extrusion during assembly of the inner ring, with lubrication grooves and oil holes. Bearings with an inner diameter of less than 15 mm, no lubrication grooves and oil holes. Can withstand radial loads and small axial loads in either direction.
(7) GE...DEM1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. When the inner ring is assembled, it is extruded. After the bearing is installed in the bearing housing, the end groove is pressed out on the outer ring to fix the bearing axially. Can withstand radial loads and small axial loads in either direction.
(8) GE...DS type: The outer ring has a fitting groove and a lubrication groove. Limited to large size bearings. Can withstand radial loads and small axial loads in either direction (the side of the mounting groove cannot withstand axial loads).
(2) GE...ES type: single-slit outer ring with lubricating oil groove. Can withstand radial loads and small axial loads in either direction.
(3) GE...ES-2RS type, GEEW...ES-2RS type: single-slit outer ring with lubricating oil groove and sealing ring on both sides. Can withstand radial loads and small axial loads in either direction.
(4) GE...ESN type: single-slit outer ring, GE...XSN type: double-slit outer ring (split outer ring), with oil groove, and outer ring with stop groove. Can withstand radial loads and small axial loads in either direction. However, when the axial load is received by the retaining ring, its ability to withstand axial loads is reduced.
(5) GE...HS type: There are lubricating oil grooves in the inner ring and double outer rings. The clearance can be adjusted after wear. Can withstand radial loads and small axial loads in either direction.
(6) GE...DE1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. Extrusion during assembly of the inner ring, with lubrication grooves and oil holes. Bearings with an inner diameter of less than 15 mm, no lubrication grooves and oil holes. Can withstand radial loads and small axial loads in either direction.
(7) GE...DEM1 type: the inner ring is hardened bearing steel and the outer ring is bearing steel. When the inner ring is assembled, it is extruded. After the bearing is installed in the bearing housing, the end groove is pressed out on the outer ring to fix the bearing axially. Can withstand radial loads and small axial loads in either direction.
(8) GE...DS type: The outer ring has a fitting groove and a lubrication groove. Limited to large size bearings. Can withstand radial loads and small axial loads in either direction (the side of the mounting groove cannot withstand axial loads).
2018年11月30日星期五
How to maintain the water pump bearing
How to maintain the water pump bearing
(1) The pump that is newly put into use must be replaced with grease (oil) after 100 hours of operation, and then replaced once every 500 hours.
(2) Flow bearing with grease lubrication, after 1500 hours of operation, the grease should be replaced. The amount of oil to be filled should not be too much or too little, because too much or too little grease will cause the bearing to heat up. It is preferably 1/2 to 2/3 of the volume of the bearing chamber.
(3) For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.
(4) The container containing lubricating oil or grease should be clean and should be sealed properly. There should be no dust, iron filings and other debris to avoid damage to the bearing.
(5) Motor bearings generally use sodium-based grease, which is characterized by high temperature resistance (125 ° C), but is easily soluble in water, so it can not be used for lubrication of water pump bearings.
2018年11月28日星期三
Advantages of hybrid ceramic bearings
Hybrid ceramic bearings may be less common, and the main configuration of hybrid ceramic bearings is a combination of inner and outer ring bearing steel / stainless steel + ceramic ball + PA66 / stainless steel retainer + 2RS / ZZ. Hybrid ceramic bearings have the following four advantages in use.
(1), high temperature resistance, ceramic ball thermal expansion coefficient is small, in the high temperature environment will not cause the bearing ball to expand due to temperature, which greatly improves the use temperature of the entire bearing, the temperature of ordinary bearings is about 160 degrees, ceramic ball Can reach more than 220 degrees.
(2), high speed, ceramic ball has oil-free self-lubricating properties, ceramic ball friction coefficient is small, so ceramic ball bearings have a very high rotational speed. The statistics of ceramic ball bearings are more than 1.5 times the speed of the general bearing.
(3), long life, ceramic ball can be added without any grease, which means that even if the grease is dry, the bearing can still operate, thus avoiding the premature bearing damage caused by the dry grease in the ordinary bearing. According to us The test and some customer feedback use the ceramic ball after the bearing has a service life of 2-3 times that of ordinary bearings.
(4) Insulation. Bearings made of ceramic balls can insulate the inner and outer rings of the bearing. Because the ceramic ball is an insulator, the ceramic ball can be used between the inner and outer rings of the bearing to achieve the effect of insulation. Can be used in a conductive environment. This is also the biggest advantage of hybrid ceramic bearings.
http://www.bearingkingdom.com/ceramic-bearings/
(1), high temperature resistance, ceramic ball thermal expansion coefficient is small, in the high temperature environment will not cause the bearing ball to expand due to temperature, which greatly improves the use temperature of the entire bearing, the temperature of ordinary bearings is about 160 degrees, ceramic ball Can reach more than 220 degrees.
(2), high speed, ceramic ball has oil-free self-lubricating properties, ceramic ball friction coefficient is small, so ceramic ball bearings have a very high rotational speed. The statistics of ceramic ball bearings are more than 1.5 times the speed of the general bearing.
(3), long life, ceramic ball can be added without any grease, which means that even if the grease is dry, the bearing can still operate, thus avoiding the premature bearing damage caused by the dry grease in the ordinary bearing. According to us The test and some customer feedback use the ceramic ball after the bearing has a service life of 2-3 times that of ordinary bearings.
(4) Insulation. Bearings made of ceramic balls can insulate the inner and outer rings of the bearing. Because the ceramic ball is an insulator, the ceramic ball can be used between the inner and outer rings of the bearing to achieve the effect of insulation. Can be used in a conductive environment. This is also the biggest advantage of hybrid ceramic bearings.
http://www.bearingkingdom.com/ceramic-bearings/
2018年11月26日星期一
Improvement of the inner chute grinding fixture for tapered bore roller bearings
Cylindrical Roller Bearings
Cylindrical roller bearings need to overcome the shortcomings of solid cylindrical roller bearings. In the design of hollow cylindrical roller bearings, the hollow shape should be improved and the preload problem of hollow cylindrical roller bearings should be reduced. If the hollow cylindrical rolling element has greater elasticity than the solid cylindrical rolling element, it is necessary to increase the bearing capacity, and the bearing life is improved according to the contact area of the roller bearing. The quality of the hollow cylindrical bearing and the centrifugal inertia force should be adapted to the rotational speed, improve the structural design of the hollow cylindrical roller bearing and improve the working quality. Cylindrical roller bearing is a very important mechanical component. The working performance will directly affect the working performance of the mainframe. It is necessary to continuously improve the complexity of mechanical equipment, and fully improve the high-speed, heavy-duty and high-precision extreme working conditions and rationality. For the safety, dynamic performance and load carrying capacity of cylindrical roller bearings, the requirements are increased.
Structural design of elastic composite cylindrical roller bearing
3.1 Hollow cylindrical roller bearing has many advantages. It is necessary to improve the periodic alternating state of hollow cylindrical rolling elements to ensure the reasonableness of the load. For the bending stress of hollow cylindrical rolling body, it is necessary to improve the bending fatigue fracture problem of rolling and promote the damage of hollow cylindrical roller bearing. solve. Thereby, the engineering application ability of hollow cylindrical roller bearing can be realized to meet the requirements of modern mechanical development. According to the combination innovation principle, the structural stress condition of the cylindrical roller bearing structure is improved, the bearing capacity of the bearing is enhanced, the bending stress of the hollow cylindrical rolling element is reduced, and the bearing fatigue life is guaranteed. Improve the problem of bearing noise according to the physical characteristics of the textbook.
3.2 cylindrical roller bearing structure needs innovative research, for the solid cylindrical rolling element contact stress to improve the bending stress of the hollow cylindrical rolling element, increase the rolling element and contact half-width stress level, reduce the bearing comprehensive fatigue strength problem, design a reasonable plan to improve the cylindrical rolling The sub-bearings are essentially rolling elements embedded in good molecular materials. At the same time, it is necessary to continuously improve the stress concentration at the edge of the rolling element and improve the depth of the edge design. The design of the cylindrical roller bearing structure is improved according to a certain scheme to ensure the rationality of the elastic composite column bearing. At the same time, it is necessary to improve the influence of the stress concentration on the edge of the rolling element, design a deep hole with reasonable inclination in the rolling element, and then give the cylindrical roller bearing a reasonable name for the composite cylindrical roller bearing.
3.3 Under normal circumstances, the rolling element of elastic composite cylindrical roller bearing is more likely to cause deformation than the solid cylindrical rolling element. Therefore, it is necessary to increase the contact between the rolling element and the bearing under the same load, and reduce the stress in time. The elastic composite cylindrical rolling element The stress condition should be improved in time, especially for the bending stress of the rolling body, the fatigue resistance and the damage resistance between the bearings are increased, and the bearing safety is
Cylindrical roller bearings need to overcome the shortcomings of solid cylindrical roller bearings. In the design of hollow cylindrical roller bearings, the hollow shape should be improved and the preload problem of hollow cylindrical roller bearings should be reduced. If the hollow cylindrical rolling element has greater elasticity than the solid cylindrical rolling element, it is necessary to increase the bearing capacity, and the bearing life is improved according to the contact area of the roller bearing. The quality of the hollow cylindrical bearing and the centrifugal inertia force should be adapted to the rotational speed, improve the structural design of the hollow cylindrical roller bearing and improve the working quality. Cylindrical roller bearing is a very important mechanical component. The working performance will directly affect the working performance of the mainframe. It is necessary to continuously improve the complexity of mechanical equipment, and fully improve the high-speed, heavy-duty and high-precision extreme working conditions and rationality. For the safety, dynamic performance and load carrying capacity of cylindrical roller bearings, the requirements are increased.
Structural design of elastic composite cylindrical roller bearing
3.1 Hollow cylindrical roller bearing has many advantages. It is necessary to improve the periodic alternating state of hollow cylindrical rolling elements to ensure the reasonableness of the load. For the bending stress of hollow cylindrical rolling body, it is necessary to improve the bending fatigue fracture problem of rolling and promote the damage of hollow cylindrical roller bearing. solve. Thereby, the engineering application ability of hollow cylindrical roller bearing can be realized to meet the requirements of modern mechanical development. According to the combination innovation principle, the structural stress condition of the cylindrical roller bearing structure is improved, the bearing capacity of the bearing is enhanced, the bending stress of the hollow cylindrical rolling element is reduced, and the bearing fatigue life is guaranteed. Improve the problem of bearing noise according to the physical characteristics of the textbook.
3.2 cylindrical roller bearing structure needs innovative research, for the solid cylindrical rolling element contact stress to improve the bending stress of the hollow cylindrical rolling element, increase the rolling element and contact half-width stress level, reduce the bearing comprehensive fatigue strength problem, design a reasonable plan to improve the cylindrical rolling The sub-bearings are essentially rolling elements embedded in good molecular materials. At the same time, it is necessary to continuously improve the stress concentration at the edge of the rolling element and improve the depth of the edge design. The design of the cylindrical roller bearing structure is improved according to a certain scheme to ensure the rationality of the elastic composite column bearing. At the same time, it is necessary to improve the influence of the stress concentration on the edge of the rolling element, design a deep hole with reasonable inclination in the rolling element, and then give the cylindrical roller bearing a reasonable name for the composite cylindrical roller bearing.
3.3 Under normal circumstances, the rolling element of elastic composite cylindrical roller bearing is more likely to cause deformation than the solid cylindrical rolling element. Therefore, it is necessary to increase the contact between the rolling element and the bearing under the same load, and reduce the stress in time. The elastic composite cylindrical rolling element The stress condition should be improved in time, especially for the bending stress of the rolling body, the fatigue resistance and the damage resistance between the bearings are increased, and the bearing safety is
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