Slewing bearing is a large bearing with special configuration, which can endure biggest multiply load, such as axial&radial load, overturning moment,etc.
Slewing ring is composed of outer ring (teeth or non-teeth),rolling (steel ball, cylindrical roller, tapered roller), cage, inner ring(teeth or non-teeth) and seals (the one with sealed structure).
Slewing bearing itself is featured in compact structure, convenient lead to slew, easy for installation&maintenance, which is widely used as slewing set in the fields of heavy machine, slewing platform in the steelworks, excavator grab, material taking&stacking set, material traveler, harbor machine, missile lauching cage,CT set, etc.
1）Rings: Steel 45#,50Mn(carbon structural steel), 42CrMo (alloy structural steel). 50Mn and 42CrMo are usually used.
2）Rolling : It is made of chrome steel GCr15 or GCr15SiMn.
3）Seal: It is usually made of NBR,iron,felt,or other thing which meet the capability.
Hardness: Normalizing hardness of the rings is 187HB-241HB, quench & temper hardness is 229HB-269HB, hardness of the raceway after quenching is 55HRC-62HRC.
Normally we have structure for slewing bearings as below:
Single-row light weight series slewing bearings
Accept custom making according to drawing or requirment.
For further detail information, please click the below application name you need.
DRE supplies the slewing rings to a wide range of the excavators, a good replacement of excavator slewing ring bearings used on Komatsu, Hitachi, Kobelco, Caterpillar, and so on, we can supply according to the most of the machine number, and a lot of slewing rings are in stock for the quick delivery.
Because of the light structure of the crane, slewing ring bearing is an essential and strategic part. Our slewing rings are widely used in kinds of cranes, such as tower cranes, ship deck cranes, mobile cranes, railway cranes and so on.
All our slewing bearings follows the international certification standards and can accept the inspection such as DNV, GL and others.
DRE can supply the fastening bolts for the slewing ring bearings for mounting. We can produce as customer requirements. Normally the bolts can use the same material as the slewing ring bearings, or also can use others as requires. And we can produce the match pinion of slewing rings according to the spec if customers purchase pinion together with slewing bearings.
Slewing ring refurbishment can offer significant savings when compared to a replacement slewing ring. Repair or refurbishment is usually only economic on slewing ring with large bore size and depends on the degree of wear or damage. Repair on smaller slewing rings is possible, but only becomes economic on larger batch sizes.
Certain types of damage are easy to repair, such as minor surface scuffing or light staining. Moderate surface conditions, such as corrosion, indentation of fine spalling, and more difficult tpo repair and will probably require raceway grinding. Also some bad condition we have to change the rollers/balls and cage, re-grinding on the raceway and surface. It all depends on the status of the slewing rings.
So if you want to repair on your slewing ring, please contact with us to show the condition of the slewing rings and better the photos to let us check if can be repaired and give you the repair suggestion on this.
We determine the hardness according to the diameter of depression in the forged rings.