METHODS OR MAKING CURVILINEAR MEMBER HAVING INNER AND OUTER COAXIALLY MOUNTED TUBES AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 2005 - IPC

FIELD: machine engineering, namely manufacture by bending complex-shape pipelines having coaxially mounted tubes, for example for heat exchangers and fuel supply systems.

SUBSTANCE: method for making curvilinear member having inner and outer tubes is realized at using inner tube with curvilinear and rectilinear portions. Outer tube is mounted coaxially relative to inner one during process of bending outer tube on template. The last has working groove whose surface is congruent to surface of curvilinear portion of inner tube. Apparatus for performing the method includes template, unit for clamping tube and stationary hollow cylindrical mandrel. Clamping unit has cavity formed by changeable holders; one holder is movable and other is stationary relative to template. In description of invention relation is given for determining length of stationary holder. One end of hollow mandrel is arranged in cavity of clamping unit.

EFFECT: lowered cost price, improved operational reliability of product.

5 cl, 6 dwg