METHOD FOR MAKING SLEEVE WITH FLANGES Russian patent published in 2004 - IPC

FIELD: plastic working of metals, possibly in forging shops of metallurgical and machine engineering plants for making automobile wheels and similar products.

SUBSTANCE: method comprises steps of preparing initial blank and then shaping intermediate product in the form of cup having shaped bottom, wall and thickened portion near wall-to-bottom transition zone. Said thickened portion is restricted at inner side of cup by surface of revolution, by annular protrusion on outer end of bottom and by flange on wall end. Annular protrusion is cone at inner side. Flange on wall end is formed by applying to said end axial effort for increasing thickness of wall near its end while keeping constant diametrical size at inner side. Then blank is finally formed due to expanding intermediate product from inside in zone adjoined to its end. During such procedure cone whose apex is turned to bottom of cup is formed. Conicity angle of annular protrusion of intermediate product and conicity angle of wall of blank in zone adjoined to its end are selected in given ranges.

EFFECT: improved quality of ready products.

4 cl, 3 dwg, 2 ex