Abstract:
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The development of an industrial hydroforming process has been undertaken at
Saclay, with the help of experts in forming material. In a first step, finite
element program "Forge 2" was modified and tested with copper and niobium tubes
on the CERN hydroforming bench. In a second step, we have designed with the
help of "BOURGOGNE HYDRO" company an hydroforming machine able to form 1.3 GHz
cavities in few steps according to the calculation. In the same time,
calculations were performed by the CEREM (CEA Material Research Center) to
optmize the forming process of large high RRR niobium tubes as required for
3-cells fabrication. The "FORGES-DE-BOLOGNE" company carried out the effective
production. of seamless bulk tubes. First attemps of hydroformed monocells
with RRR 30 and RRR 200 Niobium will also be described in this paper, and
compared the results of simulation calculation.
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