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Bearings for tubular stranding machines

Bearings for tubular stranding machines

Wire rope machines, through twisting and braiding processes, are machinery capable of forming steel, aluminum, and other metal ropes and cables, used in various industries and sectors for anchoring, lifting, and traction purposes.

The bearings for the rotor of these machines must meet specific working conditions:

  1. Very high speeds. The inner rings of the bearing are placed directly above the outer diameter of the rotor body. The maximum rotation speed of this machine far exceeds that of any other bearing permissible at this size.
  2. High acceleration and deceleration forces during machine startup and shutdown. This must be taken into account to establish the cage design and the mass of the rolling element assembly.
  3. Thermal expansions that must be freely absorbed by the bearing. To this end, only one of the bearings is intended to be the reference bearing, and the others are floating bearings.
  4. Defective alignment. After a certain period of operation, poor alignment may occur, which must be supported by the bearings.

 

A relatively small bearing is mounted as the reference bearing on one side, and it can be chosen independently of the rotor diameter. For this position, spherical roller bearings are used.

The floating bearings must be able to displace along the axial direction even after long periods of operation, which is why cylindrical roller bearings are preferred.

These bearings must have specific characteristics for this application:

  1. Dimensional specifications according to ISO standards or special dimensions according to specific customer requirements.

  2. "N" shape with a removable outer ring, inner ring with two edges, a row of rollers with a solid cage centered on the rollers or on the inner ring, circumferential groove, and three lubrication holes on the outer ring.

  3. Cages are usually made of lightweight alloy to allow high rotation speeds or bronze, always to be evaluated according to actual working conditions.

  4. Crowned outer ring raceway to allow ± 8-10' misalignment.

  5. Precision class P6/P5.

  6. Radial clearance at the bench usually between C3 and C4 (to be verified case by case based on mating tolerances, thermal expansion, or specific customer requirements).

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