The carbodies and underframes are the basic load-bearing parts of railway vehicles providing for firm and stable interconnections of all parts both inside and outside the vehicle. Sufficient dimensioning and suitable construction design determine a number of other parameters – such as passenger safety, total weight, usable properties, appearance, layout of the vehicle etc.
The construction of the carbody is either integral or differential, or a combination of the two. The most frequently used materials include steel (differential structure), mainly for the reason of easy accessibility and repair, and recently also aluminum alloys, especially in the form of protruded profiles (integral structure). And further, even though in smaller amounts, and for the purpose of particular construction units only, alternative materials, like corrosion-resistant or high-strength steel, plastics, composite materials are used.
VÚKV a.s. employs a team of experienced experts in development of carbodies. The development begins with design and strength studies and feasibility studies. The results of the studies guide further progress of the carbody development - design and construction, already including detailed, especially strength calculations. In the design stage these calculations verify whether the designed construction solutions are feasible and in the construction stage they help optimise the structure.
The carbody is a construction unit whose development and manufacture are always carried out in advance of all other works. This fact places great demand on flexibility of the development staff, their cooperation with the other design groups and the manufacturing plant. In the course of the manufacture emphasis is laid on change documentation and reflection of the changes in the final serial manufacturing documentation. VÚKV a.s. possesses extensive experience in this too and can offer high-standard services in this area.
Regular parts of a carbody development also include experimental verification of strength of the structure – the so called static strength test, performed by the testing laboratory of the VÚKV a.s.