Vol.11, No2, 2011, pp.109-114
UDC 625.122.085

The geometry of a railway is obtained through tamping operation. The tamping operation is one of the most important operations for building and maintenance of railway and is executed with the help of different tamping tools, like BNRI-85 tamping tool. This type of tamping tool comes in different models. We have improved this type of tamping tool to decrease stress, tension concentrators, fatigue, wear and breakages. We used two methods. One of them was to make and test a new model of tamping tool BNRI-85, under real workplace conditions. For the second method we used a CAD programme to design and verify this new model of tamping tool. Using these two methods, we could determine critical areas, the wear mechanism, potential breakage sections and compare the results in order to improve this new tamping tool. Because the tamping operation involves vibration movement, we have determined the eigen frequencies of the tamping tool through the CAD method, establishing that the resonance phenomenon does not appear. For the active part of this tamping tool we used tungsten carbides scrap to increase the consistency.

Keywords: tamping tools, stress, test, CAD (computer aided design)