Cement equipment use two row Cylindrical roller bearing NNU4172M 600x360x243mm

Cement equipment use Cylindrical roller bearing NNU4172M 600x360x243mm 

NNU4172M double row cylindrical roller bearing had matched the spherical roller bearing 24172EC3 used for cement equipment.

NNU4172M double row cylindrical roller bearing feature:
Cylindrical roller bearing consists of an inner ring and outer ring and a complement of controlled-contour cylindrical rollers.Depending on the style of bearing,either the inner or the outer ring will have two roller-guiding ribs. The other rings,separable from the assembly, has one rib or none. The ring with two ribs axially located the position of the roller assembly. The diameters of these ribs may be used to support the roller. One of the ribs may carry light thrust loads when an opposing rib is provided in the mating ring.
The cylindrical roller bearing including single row cylindrical roller bearing, Two row cylindrical roller baring, four row cylindrical roller bearing and mullti-row cylindrical roller bearing.

Forging process:

The blanks of bearing rings are mainly made of rods and tubes, while the forging process is only applicable to rods. However, forgings are the most used blank materials in bearing manufacturing, and are suitable for large and medium-sized bearings. Forging can be divided into hot forging, cold forging and warm forging. Hot forging refers to processing above the re-crystallization temperature of the billet metal, warm forging is forging at a temperature not exceeding the re-crystallization temperature, and cold forging refers to forging at normal temperature.

The purpose of ferrule forging: 1. Through forging, obtain a blank with a size similar to the product, improve the utilization of metal materials, reduce the amount of machining, and reduce costs. 2. Forging can eliminate the internal defects of the metal, improve the structure, and thus increase the service life of the bearing.

General process of forging:

Bar material ,inspection, heating, blanking, secondary heating, forging, rolling,cooling, annealing, cleaning

Rough turning: Rough turning is performed according to the drawing of the turning process, and the cutting speed and cutting amount are strictly implemented according to the technical regulations (the general cutting speed is 5 rpm. The cutting amount is 10mm ~ 12mm).

2.2 Rough turning aging: After the rough turning of bearing parts is completed, three-point support and flat laying is not allowed (stacking is not allowed), and the precision turning processing can be performed after the aging time is not less than 48 hours.

2.3 Fine turning bearing parts When finishing turning, the cutting speed is 6 to 8 revolutions per minute, and the cutting amount is 0.3 to 0.5 mm.

2.4 Precision turning: In order to prevent the parts from deforming when the bearing parts are finally finished, the parts must be loosened to make the parts in a non-stressed state. The turning speed is 8 revolutions per minute and the cutting amount is 0.2 mm.

2.5 Cross and three-row roller slewing bearing inner ring special process: To prevent cross and three-row roller slewing bearing inner ring from deforming after heat treatment. The turning process must be performed in pairs, that is, the raceway is back-to-back processing. No cutting is performed before heat treatment, and cutting is performed after heating.

2.6 Finished car after heating: After the inner and outer rings of the bearing are heat-treated, the finished car turning process is carried out, and the technical procedures are the same as 2.3 and 2.43)

NNU4172M cylindrical roller bearing application as following:
Power generation
Aggregate processing
Oil fields
Pumps
Crop shears
Rolling mills
Gear drives
Wheel end planetary
Hoists
Wind energy
Metal construction
Mining and other industrial equipment