Performance of Koyo bearing material after heat treatment
Performance of Koyo bearing material after heat treatment
2022年5月10日
Causes and treatment measures of peeling and burn of NSK imported bearing
Causes and treatment measures of peeling and burn of NSK imported bearing
2022年5月11日

Influence of lubrication on the performance importance of IKO bearing

In order to improve the actual fitting accuracy of INA Bearing during installation.

  • In the installation of INA Bearing, the matching degree with other accessories should be considered, which requires not only ina bearing itself, but also the accessories it wants to meet. Due to the precision of INA Bearing itself, the accuracy is 1 μ M, so it is required that the matching parts (shaft, ina bearing seat, end cover, retaining ring, etc.) have high dimensional accuracy and shape accuracy, especially the accuracy of mating surface should be controlled within the same level as ina bearing, which is very important and easy to be ignored.
  • It must also be noted that if the matching parts of the precision INA Bearing fail to meet the above requirements, the error of the precision ina bearing is often several times or even more than 10 times greater than that of the original ina bearing after installation, which is not a precision INA Bearing at all. 
  • The reason is that the error of the matching parts is often not simply superimposed on the error of the INA Bearing, but amplified by different multiples.Influence of lubrication on the performance importance of IKO bearing
  • the measurement methods and tools that do not deform the INA Bearing must be used to accurately measure the fitting surface dimensions of the inner hole and outer circle of INA Bearing. Influence of lubrication on the performance importance of IKO bearing
  • All the measurement items related to the inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed. Based on this, the dimensions of the installation part of INA Bearing of shaft and seat hole can be accurately matched. When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring ina bearing.Influence of lubrication on the performance importance of IKO bearing
  • In order to ensure a high actual matching effect, the roughness of the surface matching the shaft and seat hole with ina bearing should be as small as possible.Influence of lubrication on the performance importance of IKO bearing
  • When making the above measurement, two groups of marks that can show the direction of large deviation shall be marked on the outer circle and inner hole of INA Bearing and the corresponding surface of shaft and seat hole on both sides close to the assembly chamfer, so that the large deviation of matching two sides can be aligned in the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly.Influence of lubrication on the performance importance of IKO bearing
  • The purpose of helping out the two groups of orientation marks is to comprehensively consider the compensation of deviation, which not only improves the rotation accuracy of the supports at both ends, but also partially eliminates the coaxiality error of the seat hole between the two supports and the journal at both ends.Influence of lubrication on the performance importance of IKO bearing 
  • The implementation of surface strengthening measures on the mating surface, such as sand blasting, using a precision plug with a slightly larger diameter to plug the primary inner hole, etc., are conducive to improving the mating accuracy.Influence of lubrication on the performance importance of IKO bearing
  • Size limitations. Generally, the space where NSK imported bearings can be installed is limited. In most cases, the shaft diameter (or inner diameter of NSK inlet bearing) is limited by mechanical design or other design. Therefore, the selection of NSK imported bearing type and size is determined according to the inner diameter of NSK imported bearing. Therefore, the main dimension tables of NSK imported bearings are compiled according to the internal diameter dimensions of international standards.Influence of lubrication on the performance importance of IKO bearing
  • NSK imported bearings are used in the design of mechanical devices. The nature, size and direction of the load of NSK imported bearings and the load imposed on NSK imported bearings are changeable. Influence of lubrication on the performance importance of IKO bearing
  • In general, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable NSK imported bearings. When the size of the ball and needle roller bearing is commensurate, the needle roller bearing usually has high load capacity and bears large vibration and impact load.Influence of lubrication on the performance importance of IKO bearing
  • The speed and allowable speed are determined according to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of NSK imported bearings. The allowable speed of NSK imported bearings with scale accuracy under oil lubrication and grease lubrication is listed in the table of NSK imported bearings. In general, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are all suitable for high-speed operation.Influence of lubrication on the performance importance of IKO bearing
  • NSK imported bearing tolerance, dimensional accuracy and rotation accuracy of NSK imported bearing are based on ISO and JIS standards. For machines requiring high precision and high-speed operation, NSK imported bearings with accuracy of grade 5 or above are recommended. Influence of lubrication on the performance importance of IKO bearing
  • Deep groove ball bearings, centripetal thrust ball bearings or cylindrical roller bearings are suitable for machines with high operation accuracy. Rigid, elastic deformation will occur when the contact surface of the moving elastic body and raceway of NSK imported bearing is compressed. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings
  • In some cases, the NSK inlet bearing shall be preloaded to increase rigidity. This procedure is usually used for deep groove ball NSK imported bearing, centripetal thrust ball bearing and tapered roller bearing. Inner and outer ring offset, shaft bending, tolerance change of shaft or NSK imported bearing housing, and matching error will lead to inner and outer ring eccentricity. Influence of lubrication on the performance importance of IKO bearing
  • In order to prevent excessive eccentric angle, self-aligning ball bearing, self-aligning roller bearing or self-aligning bearing seat are better choices. Voice frequency and torque, dynamic NSK imported bearings are manufactured according to high-precision standards, so voice and torque are small. Deep groove ball bearings and cylindrical roller bearings are used for occasions with special requirements for low voice and low torque.Influence of lubrication on the performance importance of IKO bearing
  • Installation and disassembly. Some applications require frequent disassembly and installation to ensure that inspection and maintenance can be carried out according to their location. NSK imported bearings with separate inner and outer rings, such as cylindrical bearing, needle roller bearing and conical bearing, are very suitable for this occasion. With the help of the shaft sleeve, the installation procedure of the taper hole type self-aligning ball bearing and self-aligning roller bearing is also simplified.Influence of lubrication on the performance importance of IKO bearing
  • SKF imported bearing of automobile rear axle is an important part driving wheel movement. SKF imported bearings mainly bear bending and torsion compound torque and certain impact load. The half shaft is usually made of medium carbon alloy steel. After overall quenching and tempering, induction heating quenching and surface hardening are adopted. Influence of lubrication on the performance importance of IKO bearing
  • The hardened layer is 4-6mm deep and the hardness is 50 ~ 55HRC. In the production of SKF imported bearings, it is found that the SKF imported bearings are often burned out, which seriously affects the production of SKF imported bearings and the induction quenching quality of workpieces. The inspection found that the burned out area of SKF inlet bearing was located in the induction ring 225. The left and right parts expand to both sides, showing the characteristics of regular failure.Influence of lubrication on the performance importance of IKO bearing
  • Radiate heat around. The induction coil is provided with a magnet, insulating paint, glass fiber cloth, etc. This form has less heat loss and uniform heat dissipation, which has little impact on the burnout of the inductor.Influence of lubrication on the performance importance of IKO bearing
  • Cooling water takes away heat. This part of heat cools the inductor and makes the induction heating run. The test shows that the water inlet is between 0-180 degrees and the water temperature is low, which indicates that the heat exchange of cooling water is good, the water flow is smooth and the water temperature rises little;Influence of lubrication on the performance importance of IKO bearing
  •  More than 180. Later, due to the long water flow path and large increase of water temperature, the rise of water temperature makes the heat exchange worse, which is easy to cause the temperature rise of the next section of the inductor (such as the left and right section of 225), which is the main reason for the burnout of the induction ring.Influence of lubrication on the performance importance of IKO bearing
  • The heat of the induction ring is transmitted to the connecting plate. The current density of the connecting plate is small and the water cross-sectional area is large, so that the water temperature in this area is low and the heat on the induction ring is transmitted to the connecting plate. At 0 ~ 90 degrees and 270 – 360 degrees, the sensing ring is close to the connecting plate and has good heat conduction;Influence of lubrication on the performance importance of IKO bearing
  • Influence of lubrication on the performance importance of IKO bearing The 90 ~ 270 degree induction coil is far away from the connecting plate, and the heat conduction effect is poor, which makes the temperature of the induction coil in this area rise greatly, and it is easy to burn out the induction coil in this section. Comparison of heat flow direction of induction coil in different parts. The induction coil has large heat accumulation and poor conduction near the 225 degree area, so the induction coil is easy to burn out in this part.Influence of lubrication on the performance importance of IKO bearing
Influence of lubrication on the performance importance of IKO bearing

There are many sizes and forms of NSK imported bearings. 

  • SKF imported bearing of automobile rear axle is an important part driving wheel movement. SKF imported bearings mainly bear bending and torsion compound torque and certain impact load. The half shaft is usually made of medium carbon alloy steel. After overall quenching and tempering, induction heating quenching and surface hardening are adopted. Influence of lubrication on the performance importance of IKO bearing
  • The hardened layer is 4-6mm deep and the hardness is 50 ~ 55HRC. In the production of SKF imported bearings, it is found that the SKF imported bearings are often burned out, which seriously affects the production of SKF imported bearings and the induction quenching quality of workpieces. The inspection found that the burned out area of SKF inlet bearing was located in the induction ring 225. The left and right parts expand to both sides, showing the characteristics of regular failure.Influence of lubrication on the performance importance of IKO bearing
  • When the half shaft is heated in the inductor, the heat generated by the inductor mainly has three ways of heat loss in addition to heating the workpiece.Influence of lubrication on the performance importance of IKO bearing
  • Radiate heat around. The induction coil is provided with a magnet, insulating paint, glass fiber cloth, etc. This form has less heat loss and uniform heat dissipation, which has little impact on the burnout of the inductor.Influence of lubrication on the performance importance of IKO bearing
  • Cooling water takes away heat. This part of heat cools the inductor and makes the induction heating run. The test shows that the water inlet is between 0-180 degrees and the water temperature is low, which indicates that the heat exchange of cooling water is good, the water flow is smooth and the water temperature rises little;Influence of lubrication on the performance importance of IKO bearing
  •  More than 180. Later, due to the long water flow path and large increase of water temperature, the rise of water temperature makes the heat exchange worse, which is easy to cause the temperature rise of the next section of the inductor (such as the left and right section of 225), which is the main reason for the burnout of the induction ring.Influence of lubrication on the performance importance of IKO bearing
  • The heat of the induction ring is transmitted to the connecting plate. The current density of the connecting plate is small and the water cross-sectional area is large, so that the water temperature in this area is low and the heat on the induction ring is transmitted to the connecting plate. At 0 ~ 90 degrees and 270 – 360 degrees, the sensing ring is close to the connecting plate and has good heat conduction; Influence of lubrication on the performance importance of IKO bearing
  • The 90 ~ 270 degree induction coil is far away from the connecting plate, and the heat conduction effect is poor, which makes the temperature of the induction coil in this area rise greatly, and it is easy to burn out the induction coil in this section. Comparison of heat flow direction of induction coil in different parts. The induction coil has large heat accumulation and poor conduction near the 225 degree area, so the induction coil is easy to burn out in this part.Influence of lubrication on the performance importance of IKO bearing

When the half shaft is heated in the inductor, importance of IKO bearing

  • High speed grinding technology is widely used. When grinding the inner surface, the linear speed of the grinding wheel can reach 60 ~ 80m / S; When grinding the outer surface, the linear speed of the grinding wheel can reach 120m / s.
  • The improvement of grinding wheel grinding linear speed puts forward new requirements for the dynamic balance of grinding wheel. Therefore, the grinding machine tools adopt the dynamic balance device of grinding wheel to make up for the imbalance of grinding wheel caused by grinding.
  • In order to meet the requirements of Timken bearing ring grinding automation, CBN grinding wheel grinding technology has been adopted in Timken bearing ring grinding. Compared with ordinary grinding wheel, its wear ratio is as high as 4000 ~ 10000, which is about 150 times that of ordinary grinding wheel. The grinding efficiency is very high, especially suitable for automatic high-speed grinding.
  • As the material for manufacturing Timken bearing grinder bed, artificial granite is gradually adopted by machine tool manufacturers all over the world because of its strong rigidity, good vibration resistance, low thermal conductivity and short manufacturing cycle.
  • With the help of frequency converter and PC or CNC programming control device, the spindle of head frame and Timken bearing grinder can adjust speed steplessly to obtain large sales volume, high processing quality and maintain the constant linear speed of grinding wheel.
  • With the development of cutting in grinding technology and the application of computer in measurement feedback (inductance active measurement) system, cutting in grinding, dimension measurement and feedback control become a closed-loop system.
  • With the development of hydraulic component technology, the hydraulic system of Timken bearing ring grinder has also been updated. Variable vane pump is widely used to control the working temperature of hydraulic oil at a level higher than 5 ℃ of room temperature, which overcomes the influence of hydraulic system on the working accuracy of machine tool and product processing accuracy.
  • The combined grinding technology of two processes on the same grinder has been applied in Timken bearing ring grinding, which not only ensures high machining accuracy, but also greatly improves the machining efficiency of products.
  • Due to the rapid development of numerical control technology and its hot running components (servo motor, ultra precision roller lead screw and encoder, etc.), PC and CNC control technology are widely used in the control system of Timken bearing ring grinder. The CNC system can program, control, store and modify the action of each mechanism and the whole processing cycle parameters of Timken bearing ring grinder; The grinding wheel dresser realizes the requirements of forming and dressing of linear or circular grinding wheel through NC coordinates.
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