CIC ovens: the world's first use in truck manufacturing
December 2012 – Dürr is building a new oven line for the thermal treatment of sealing points at truck cabins in the Mercedes-Benz plant in Wörth. It is the world's first use of CIC (Conveyor Integrated Convection) ovens in truck manufacturing.
A convection oven consists of a complete module including integrated roller bed and external drives. This allows for stop and go operation, thereby ensuring high flexibility. The integrated conveyor system provides maximum ease of maintenance and prevents all heat loss. Furthermore, the oven is extremely easy to clean.
In terms of weight, design and size, truck cabins differ greatly from passenger cars. The oven line was therefore modified to suit the requirements of the factory in Wörth. When it came to the design, dimensions and functionality of the system, one of Dürr's primary concerns was to select the right materials and identify potential energy savings.
Oven and cooling zone were fully pre-assembled at Dürr's site in Ochtrup. The abnormal load was transported as individual units with a length of up to 11 meters all the way to Wörth, covering a distance of around 550 kilometers.
With a crane spanning 60 meters – almost 150 meters using a jib – and weighing 108 tons, the components were lifted into the workshop from above and placed in their final positions. The parts were suspended at a maximum height of 56 meters – this would have been impossible in strong wind. Calm and stable weather conditions were therefore just as important in this project as the smooth transportation of the heavy load; otherwise it would have been impossible to keep to the tight schedule.
There was not much space in the workshop. Truck production continued in parallel, so there was no temporary storage space available for the oven units.
“It was an exciting construction project with several unknowns”, summarizes Gino Caparelli, who managed the project together with Jörg Köhler. “But we had planned everything very thoroughly with the colleagues from Mercedes, and that eventually paid off.”
This was a big first step, but marked only the start of the assembly and commissioning of the oven line. As a large part of the work can only be done in the weekends to ensure uninterrupted truck production, the Dürr team will be present in Wörth till January or February.