As for this invention in the most general feature, as method of sheet material corrugation it is possible, to be defined at the same time curved line time of the curved line sandwich panel of the airliner it is possible to be used for tune structure optical corrugated core production. Corrugated blank from the side is compressed by the connection section of the edge the fact that this technical ability is expanded as purpose, by the curved line time tune structure design parameter is demarcated offers the tune diameter which to the side section. Furthermore, being locked in this circumstance, block is processed in order to ease internal stress thermally in the product material, curved line time of given pulls to the tune structure and is extended.
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