KUHN turned to Tata Steel to help improve tube consistency
Working closely together, the two partners co-developed a new hollow section specification, unique to this application. This specification corresponds perfectly to the design of the gyrotedders and particularly the welding process of the hinges to the tubes.
Tata Steel’s specialist sector team modified the settings of its tubes mill, which ensured the tight specifications required could be met every time.
Tata Steel now supplies KUHN with Hybox TT (Tight Tolerances) high strength cold formed hollow sections. With a minimum strength of 355 MPa, excellent formability and weldability, it is used in a wide range of demanding construction and mechanical applications, including agricultural machinery.
The manufacturing specification for Hybox TT is twice as stringent as the requirements of standard EN 10219.
Rolled according to the precise new specifications, Hybox TT meets KUHN’s narrow dimensional tolerances and has reduced concavity/convexity values. As well as a consistent ready-to-paint surface finish, the ends of the tubes are supplied clean, safe and free of burrs. They alleviate the need to sort the tubes and reject non-compliant ones. Furthermore, they enable the smooth, continuous, automated welding process that is required for serial production.
KUHN and Tata Steel
The collaboration between KUHN and Tata Steel has improved product quality such that KUHN’s tube rejection rate is now almost zero. The need for manual re-working has been eliminated, which has boosted output yield and overall production efficiency.
These results mean that KUHN has introduced Hybox TT into more machines, making its assembly plants more efficient and optimising the quality and performance of the gyrotedders. In turn, KUHN can uphold its brand promises to customers.