Method for manufacturing a rotationally symmetrical construction part

摘要

An apparatus and method for fixedly positioning a rotationally symmetrical constructional part having an irregular longitudinal peripheral wall consisting of a plurality of spirally wound juxtaposed tubes. The apparatus comprises a rotatable core having a peripheral surface corresponding to the inner contour of the peripheral wall for supporting the tubes with means for rotating the core about the axis of symmetry. Clamping devices are included for fixedly positioning the ends of the tubes on the core. A wire wrapping device is positioned alongside the core for applying a removable temporary wire wrapping of non-circular wire cross-section under tensile stress to the surface of the tubes. The wrapping device includes guide devices for guiding the wire to the surface of the tubes in a plane substantially perpendicular to the axis of symmetry and for maintaining the wire under a selected tensile stress so that it is helically wound in successive contacting turns over the tubes, and a device for effecting a change in the elevation of the wire wrapping device depositing the wire on the tubes during heating of successive turns of the wire. The apparatus and method cause the successive contacting turns of wire to closely and forcefully apply against preceding turns of wire and against the tubes for forming the constructional part.