STORY

How do we make... metal harder?

Posted on October 31, 2013 by Marcel Rothmund, Images by Robert Hack

1,800 revolutions per minute – steel on steel. Only the very hardest of components can take the strain. But how is that hardness achieved?
Friedrichshafen, Germany

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Hardening shop workers lift the red-hot camshafts out of the 850° annealing furnaces with a crane and immerse them immediately in an oil bath for quenching.
Angelo Caruso tests the hardness of the heat-treated camshafts using the Rockwell method.
The hardness test is followed by the peening stage for cleaning. Gunther Dziewas takes the finished camshafts out of the sand-blasting machine.

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