Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Rank higher in turn, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, high-speed rotation and small changes in friction and friction.
2013年8月12日星期一
will reduce the cylindrical roller bearing life.
Temperature frequently expressed cylindrical roller bearings in unusual circumstances, high temperature also harmful in the cylindrical roller bearing lubricant, sometimes cylindrical roller bearings overheating can be attributed to cylindrical roller bearings lubricant, if cylindrical roller bearings in more than 125 degrees Celsius long run, will reduce the cylindrical roller bearing life.
Cylindrical roller bearings high temperature causes of damage include: lack of lubrication or excessive lubrication, the lubricant containing magazine, the load is too large, cylindrical roller bearing damage, lack of space, and seal the heat generated by friction and so on.
Cylindrical roller angular contact ball bearing rolling elements and the inner and outer raceway surfaces are exposed to periodic pulsating action of the load, resulting in a periodic variation of contact stress. When stress cycles reaches a certain value, the rolling elements or inner, outer ring raceway fatigue spalling on the work surface. If the cylindrical roller bearing load is too large, this fatigue worse. In addition, the cylindrical roller bearing is not properly installed, the shaft bent, will produce raceway spalling. Cylindrical roller bearing raceway fatigue spalling will reduce shaft running accuracy, enables organizations to happen vibration and noise. Adhesion of the metal cage on the rolling elements, may cause the rolling body is within the card in the holder or insufficient lubrication.
Cylindrical roller bearings burns its raceway, rolling on the temper color. The reason is usually burns insufficient lubrication, oil quality does not meet the requirements or deterioration, and cylindrical roller bearing assembly tight and so on.
Cylindrical roller bearing raceway and roller contact surface uneven pits, indicating cylindrical roller bearing plastic deformation. The reason is that a large cylindrical roller bearing static load or impact loads, the working surface of the local stress exceeds the material yield limit, which generally occurs in low-speed rotation of the cylindrical roller bearing.
Cylindrical roller bearing ring cracks may be due with tight cylindrical roller bearings, cylindrical roller bearing inner ring of foreign or loose, cylindrical roller bearings inclusive deformation, installation cylindrical roller bearings and poor surface finish. Cylindrical roller bearing cage fragmentation, the reason is lack of lubrication Cylindrical roller bearings, roller crusher, seat skew and so on.
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