PROCESS OF ANCHORING OF TUBES IN TUBE GRATES Russian patent published in 1998 - IPC

FIELD: plastic metal working, specifically processes of anchoring of tubes in tube grates by directed localized deformation of tube material. SUBSTANCE: process includes formation of ring protrusions on outer surface of ends of tube, installation of tube in hole of grate having ring recesses of rectangular cross-section. Registration of tube against possible axial displacement and its further anchoring in grate with provision for match of protrusions and recesses is carried out by application of radial effort from side of inner surface of tube. Outer thickening is formed on tube end, for instance, by sequential upsetting with simultaneous calibration of hole of tube over length of thickening prior to installation of tube into hole of grate. Ring protrusions are formed on thickened part of tube creating first ring protrusions with trapezoidal cross-section and geometric dimensions exceeding required ones. After this geometric dimensions of ring protrusions are brought to required ones by surface deformation of material of tube, for example, by forming with the aid of gauges. EFFECT: enhanced efficiency of process. 1 cl, 9 dwg