Abstract
The subject of the research was Underfloor Wheel Lathes de-signed to regenerate the profiles of the running wheels and brake discs of heavy rail vehicles without removing the wheelsets. These machines can also be used to regenerate wheel sets in trolleys dismantled from vehicles or the wheel sets themselves. The machine tools operate in a pass-through system. Two machine tools differing in the structure of the supporting sys-tem were tested: monolithic and folding. Conclusions are based on the re-sults of the FEA simulation. They concerned the influence of the type of supporting structure and connection between the bodies on the static stiff-ness, forms of vibrations and dynamic stiffness of machine tools.
Highlights
Underfloor wheel lathes are used in the railway industry
The question arises what the supporting structure of the machine tool should be like. Should it be a steel structure welded and bolted from modules, a cast iron structure bolted from modules, or a monolithic cast iron structure? Some manufacturers decide to use a polymer concrete cast structure or a hybrid one, i.e. a steel structure filled with polymer concrete [3, 4, 5, 6]
On the basis of the obtained results, the following conclusions were formulated regarding the influence of the type of the supporting structure and the connection between the bodies on the static stiffness, vibration modes and the dynamic stiffness of machine tools
Summary
Underfloor wheel lathes are used in the railway industry. They allow re-profiling (rolling) of the wheel profile of some railway vehicles. The subject of this study is the analysis of two variants of the structure of the bearing system of an underfloor wheel lathe intended for machining of wheelsets This machine tool is classified as heavy machine tool. Two machine tools from the same manufacturer, of the same size and purpose, were taken into account They differ in their supporting structure in such a way that one of them is a structure built on the basis of cast iron bodies, constituting a kind of modules of the supporting structure bolted together. Static and dynamic tests allow to identify the deformations of the main components of the machine tool, and to determine their impact on the accuracy and efficiency of machining (maintaining dimensional tolerances, the ability to fall into vibrations and determining the stable machining band)
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