METHOD OF PRODUCTION OF CURVED ELEMENT THAT CONTAINS INNER AND OUTER PIPES INSTALLED COAXIALLY TOWARDS EACH OTHER Russian patent published in 2009 - IPC B21D9/05 B21D53/06 

FIELD: engineering industry.

SUBSTANCE: invention relates to engineering industry, namely to production of curved elements of shaped form pipe lines that contain coaxially installed pipes for heat exchangers and fuel supply systems. First outer pipe is put on flexible mandrel, then coaxial arrangement of inner and outer pipe is performed by way of flexible mandrel centering along inner pipe together with outer pipe bending. Note that for the provision of pipes coaxial arrangement inner pipe serves as base master form for flexible mandrel. Inner pipe is constantly cooled down by liquid flow that runs through it. Bending is performed in pipe-bending machine with the help of guide rails and bending rollers. Outer pipe with flexible mandrel is moved through ring induction block of high-frequency current with simultaneous local heating of outer pipe area by high-frequency current. After that the area is cooled down by water spraying machine connected with induction block. Then flexible mandrel is withdrawn from the outer pipe.

EFFECT: technological capabilities are extended.

3 dwg