Problems with roller bearings solved in concrete pipe production

Every two to three months, a British manufacturer of concrete pipes was faced with bearing failures at the blade carrier of a concrete saw which always resulted in eight-hour downtimes. As part of the so-called added-value program (AIP), engineers of NSK examined the operation and noticed that early failures were caused by concrete dust. The examination revealed that dust was able to pass the seals, thus ingressing into the bearing and contaminating the lubricant of the covered deep groove ball bearing.

NSK recommended to switch to Molded-Oil bearings with contact type seals (DDU). These bearings are lubricated with NSK‘s original oil-impregnated material, consisting of lubricating oil and polyolefin resin that has an affinity to oil. This material – that prevents the ingress of pollutants – provides for continuous supply of the lubricant for a long period of time. In comparison to grease-lubricated bearings, Molded-Oil bearings achieve more than twice the operating life in water- and dust-contaminated environments.


Savings of 38,400 Euros

The concrete saw was modified accordingly, and no bearing failure had occurred over the following twelve months. Hence, the operating life of the bearings has quadrupled at least. As a result, the user has saved 38,400 euros for service costs and downtimes in the first year.

This is not only achieved by the Molded-Oil technology but also by the highly efficient packing of the bearings with contact type seals (DDU). They also prevent contaminations from ingressing into the bearing and thus increasing the operating life of the bearing in unfavorable environmental conditions.

This application case is an example for the typical approach of the AIP program of NSK. Specialists experienced in both roller bearings and the respective industry and field of application examine the present application of the bearing and develop proposals for an optimization that is aiming at minimizing downtimes and increasing the operating life of the bearings.

Related articles:

Issue 2012-01

Replacement of the roller bearing annually saves € 68,600

If the automated precast component production does not run “smoothly“ once, a quick action and support of experts is absolutely reasonable. This was the logical response of a manufactu­rer of...

Issue 2012-01

Problems at pan-type mixers solved

Every person involved in concrete manufacturing knows the countless problems with hardened concrete caused by worn out mixing arm bearings and spring units. Pan mixers of any common manufacturer...

Issue 2017-02 Improved design models as against EC 2

Increase in the load-bearing capacity of shear stud assemblies

A purposefully applied supplementary reinforcement can considerably increase the load-bearing capacity of fastenings embedded in concrete under tension load (mode of failure: concrete cone failure)...

Issue 2010-01 Patent

Mixing arm of Pucest®

Every concrete worker is familiar with the pictures of a worn out mixing arm bearing and spring units with hardened concrete residues. As is well-known, all these may result in numerous problems. Pan...

Issue 2010-01 Efficient construction method

Bearings without complex bracket strips

The manufacturers united in VBBF (German association for the promotion and development of fastening, reinforcement and façade technology) are jointly committed to realize efficient concrete...