Crankshaft forgings approx. 4.5 to 9 m in length are produced in hydraulic presses and using the single throw procedure. In this process, extremely high forming forces must be controlled. During throw-by-throw forging, the forgings (spindles) are heated section by section to a temperature of 1,300°C. This is followed by the axial compression of the spindle section and the vertical pressing of the individual main journals. The formed crankshaft is therefore created step by step. All devices used in single throw forging are designed and produced in-house by Maschinenfabrik ALFING Kessler. Thanks to our high level of process reliability during forging, we are able to maintain a low allowance for mechanical machining.
A total of 10 round chamber furnaces are available at the press forging shop. In each furnace, two spindles can simultaneously be subjected to throw-by-throw heating.
The transport of the work pieces from the furnaces to the forging presses is performed using state-of-the-art crane systems with a load capacity of up to 40 t.
The hydraulic presses each have a press force of 3,500 t. Up to 10 forgings are produced by each press in a single forging cycle.