METHOD OF AUGER MANUFACTURE AND AUGER Russian patent published in 2009 - IPC B21C37/26 B23K31/02 B23K101/08 B23P15/04 

FIELD: technological processes.

SUBSTANCE: cut open annular sectors are previously welded with rectangular sections into continuous spiral. Spiral is installed on shaft. The first annular sector of spiral in point lying on its internal circumference is tack-welded to shaft origin. Annular sectors are distributed on shaft, starting from the first one by imparting rotary motion to shaft with permanent speed with provision of perpendicularity of spiral generatrix to shaft axis in zone of current auger vane distribution along shaft. The first one and a half turns are welded to shaft at least in three points with pitch equal to half of turn pitch, and the last turn is rigidly fixed, preventing it from longitudinal and rotary displacement. Then, after the first turn, shaft is cut at the angle α, equal to angle of spiral lift, and free part is rotated by 180°. Afterwards shaft is periodically displaced in longitudinal direction by value S of spiral turn step for further welding of previously bent segment into internal surface of every vane, and the first and last one and a half turns are welded to shaft.

EFFECT: prevention of auger jamming in operation.

2 cl, 3 dwg