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NSK’s Molded Oil bearings

NSK’s asset-improvement programme has delivered an annual cost saving of €38,400 for a concrete pipe manufacturer. This has been achieved by reducing failures on the blade support roller of a concrete pipe-slotting machine, replacing the original bearings, which were lasting 2-3 months on average, with NSK Molded Oil bearings. To date, these bearings have operated for 12 months without a single failure.

The problem on the original bearings, as identified by an NSK applications engineer, was the ingress of concrete dust. This is a common problem in the industry as the dust combines with bearing lubricant to produce an abrasive mixture that causes premature bearing failure. In this instance, the dust-contaminated lubricant was causing failures four times a year, each failure resulting in 8h downtime, at a cost of €1,200/h.

As a means of overcoming the problem, NSK’s engineer recommended using bearings equipped with Molded Oil, a solid lubricant technology developed by NSK for bearings used in remote locations, and/or where oil- and grease-absorbing dust is produced.

Molded Oil has been proven to transform the performance of bearings used in machinery and equipment - in terms of reliability, maintenance-free intervals and operation - in environments exposed to contamination. It also allows plant operators to make real cost savings by replacing existing, and often costly, methods of lubricating machine parts.

Molded Oil differs from other oil-impregnated plastics, where the oil content is just a few percent by weight, by offering a lubricating oil content of more than 50% by weight. This allows the material to always maintain a good lubrication regime, helped by the mechanism of oil discharge from the matrix, where this is temperature dependent, so the higher the heat generation, the higher the oil-discharge rate. Operating temperatures are normally limited to 60°c.

NSK UK Ltd, Northern Road, Newark, Notts NG24 2JF; tel: (0500) 2327464; fax: (01636) 643075

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