| 摘要 |
Hollow bodies are produced from deformable plane or conically shaped blanks by rotating the blanks about an axis extending at least approximately through the cross-sectional center of gravity of the hollow body to be formed and simultaneously forming undulations in the blank. The undular shaping involves continuous formation of a propagating wave having a directional component extending in a circumferential direction, with the wave being transposed by repeated undular shaping in a direction generally radially of the body to be formed. The waves are transposed exclusively parallel to the original plane of the blank and in a single directional sense toward the hollow body to be formed. In the formation process, the material is worked out of its original plane in a deflection zone annularly surrounding the cross-sectional center of gravity of the hollow body in the formation of the hollow body wall. The forming process may be performed by apparatus which includes a rotatable roll with undularly extending generatrices.
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