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Stripping
Damage status: NSK bearing load bearing rotates again, inner ring and outer ring raceway surface or rolling decent present designed stripping due to rolling fatigue phenomenon.
Reason: too much load. Bad installation (non linear) torque load foreign invasion, into the water. Poor lubrication, lubricants inappropriate NSK bearing clearance is not appropriate. NSK bearing box accuracy is bad, NSK bearing box of large uneven rigidity of shaft deflection of rust, erosion, abrasion and creasing surface deformation phenomenon the development of the cause.
Measures: check the size of load and again institute NSKbearing improve installation method is used to improve the sealing device, when stop rust. Using the appropriate lubricant viscosity, improving the lubrication method. Check the shaft and the accuracy of NSK bearing box. Check the clearance.
Skinning
Damage status: present a dark side, with a mild wear dark surface from the surface of multiple deep down inside to tiny cracks of 5 to 10 m, and on a larger scale slightly off (the tiny stripping)
Reason: the lubricant is not appropriate. Foreign body into the lubricant. Lubricant bad cause surface roughness. Matching rolling parts surface finish is not good.
Measures: improve sealing device to improve matching rolling lubricant selection of parts surface finish.
Card injury
In the injury is due to the damage state of sliding surface injury parts of small burns summary of surface damage. Slide face, rolling surface circumferential direction of linear scars. End of the roller set linear scar near the end of the roller shaft torus card.
Reason: too much too much load, preloading. Bad lubrication. Foreign body nip. The inner ring of the outer ring tilt, the deflection of shaft. The precision of the axis, NSK bearing box.
The size of the measures: check the load. Preloading is appropriate. Improve lubricant and lubricating method. Check the accuracy of shaft, NSK bearing box.
The fracture
Damage status: fracture refers to the roller Angle of groove wheel rim or on the local part are exerted impact or excessive load and a small part of the fracture.
Reason: when installation has taken a knock. The load is too large. Using bad fall, etc.
Measures: to improve the installation method (using hot charging, using the appropriate tool holder). Correct the load conditions. NSK bearing installed, supporting to guard.
Crack, crack
Damage status: crack refers to the crack damage raceway wheel or roller. If continue to use, will also include the development of the crack fracture.
Reason: greater than surplus quantity. Too much load, impact load. Stripping. Because of the raceway contact of wheel and install components of fever and micro vibration wear. Fever caused by creep. The cone shaft taper Angle. Axis of the cylindricity. Steps of the shaft radius is bigger than NSK bearing chamfer and cause interference with NSK bearing chamfer.
Appropriate measures: interference quantity. Check the load conditions. Improve the installation method. The shape of the shaft to appropriate.
Indentation
Damage status: bite into a tiny metal powder, foreign bodies, such as on the raceway surface or rotating the dent. Due to impact, such as the installation on the roller spacing interval to form the concave (brinell hardness indentation).
Reason: the foreign body nip of metal powder etc. Assembly or transport process under impact load is too big.
Measures: shock collar. Improve the sealing device. Filter the lubricating oil. Improve assembly and method of use.
Pear skinning pitting
Damage status: the weak glossy dark on the surface of the raceway pear peel pitting.
Reason: the foreign body nip appeared in the process of lubrication. Due to the moisture in the air and condensation. Bad lubrication.
Measures: to improve the sealing device. Fully filter lubricating oil. Using the appropriate lubricant.
Wear and tear
Damage status: the so-called wear is caused by friction of raceway surface or rolling surface, roller ends, shaft ring surface and maintains a concave surface of the wear and tear.
Reason: foreign invasion, rust electric erosion caused by development. Bad lubrication. Due to the irregular motion of rolling body caused by the skid.
Measures: to improve the sealing device. Cleaning NSK bearing box. Fully filter lubricating oil. Check the lubricant and lubricating method. To prevent the non linear.
The micro vibration wear
Damage status: due to the relatively tiny repeatedly sliding between two contact surfaces and the wear and tear in the contact section of the raceway surface and rolling body on. Due to wear reddish brown and black powder, and therefore is also called the micro vibration wear corrosion.
Reason: poor lubrication. Swaying motion of small amplitude. Insufficient amount of interference.
Measures: using the appropriate lubricant. Preloading. Check amount of interference. To cooperate with the surface coating lubricant
Pseudo brinell indentation
Damage status: during the micro vibration in the rolling element and raceway contact part of the wheel wear due to vibration and shaking, tired like brinell indentation impressions.
Reason: in the transport process of medium NSKbearing vibration and swing in the stall. The motion of the small amplitude motion. Bad lubrication.
Measures: in the process of transportation for shaft and NSK bearing box to be fixed. Transportation in inner ring and outer ring are to be packed separately. Plus the preloading reduce vibration. Using the appropriate lubricant.
Creep
Damage status: the so-called creep refers to the mating surfaces generated in NSK bearing clearance, relative sliding between mating surface, the creep of registering with angled mirror light or dark side, and sometimes the pages with injury and wear.
Reason: enough interference or clearance fit. Set set of tighten enough.
The interference measures: check the quantity, check transfer measures. Fastening set set appropriately. The accuracy of the shaft and NSK bearing box. The axial preloading. Rolling wheel side fastening. Bonding surface. To cooperate with the surface coating? Slip agent.
Burns
Damage status: rolling wheel, roller and cage in the rotating heat until discolored sharply, softening, deposition and damaged.
Reason: poor lubrication. Too much load (preloading is too large). Speed is too large. Clearance is too small. Water intrusion, foreign body. The precision of the axis, NSK bearing box, shaft deflection.
Measures: to study the lubricant and lubricating method. The choice of correct NSK bearing. Research, NSK bearing clearance and preloading. Improve the sealing device. Check the shaft and the accuracy of NSK bearing box. Improve the installation method.
Electric erosion
Damage status: electric erosion refers to the current in the loop turn heavy NSK bearing raceway and rolling body contact part of the flow, by sparks were emitted from thin lubricant film and its surface appear partial melting and bump phenomenon.
Reason: the ground potential difference between outer and inner ring.
Measures: in setting circuit, current flow or NSK bearing parts. NSK bearings for insulation.
Rust, corrosion,
Damage status: NSK bearing rust and corrosion with rolling wheel, rolling on the surface of the body surface rust pit type, comprehensive rust and corrosion.
Reason: water, corrosive substances (paint, gas, etc.). Lubricant is not appropriate. Due to the condensation of water vapor with water droplets. When the high temperature high humidity halt. Heavy rust bad transport process. Takes care of the state is not appropriate. Not appropriate to use.
Measures: to improve the sealing device. The lubrication methods. A halt when the rust prevention measures. Improve storage method. To be careful when using.
Install the scars
Damage status: during installation and removal, etc when used to the raceway surface and rolling surface caused by axial linear scars.
Reason: installation, remove the inner ring and outer ring tilt installation, remove the Impact load.
Measures: use appropriate tools use punching machine and to prevent the impact load. When installing the centering between each other.
Discoloration
Damage status: because of temperature rising and lubricant, etc, raceway and rolling element and cage.
Reason: poor lubrication. And the reflection of lubricant oil hot dip. Temperature rise. Measures: to improve the lubrication method.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 432314U NTN | 70 | 150 | 116 |
| 430314XU NTN | 70 | 150 | 83 |