METHOD FOR MAKING SLEEVES WITH TWO 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 forming intermediate semi-finished product in the form of cup having shaped bottom, wall, thickened portion in transition zone of wall and bottom. Said thickened portion is restricted at inner side of cup by surface of revolution, annular protrusion in outer end of bottom and by flange on wall end. Inner surface of annular protrusion is cone one. Flange on wall end is formed by applying to end of wall axial effort for increasing thickness of wall near its end and for keeping constant diametrical size of wall at inner side. Then blank is finally formed due to expanding wall of intermediate semi-finished product in zone adjoined to thickened portion near wall-to-bottom transition. After such working, cone whose apex is turned to bottom of cup is formed. In zone of wall end inner cylindrical surface is formed. Conicity angle of annular protrusion and conicity angle of wall in zone adjoined to thickened portion near wall- to-bottom transition are selected in given ranges.

EFFECT: enhanced quality of products.

4 cl, 3 dwg, 2 ex