METHOD FOR MAKING FLANGED BUSHINGS 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 zone of wall to bottom transition restricted by cone surface at inner side of cup, by annular protrusion on outer end of bottom and by flange on wall end; forming on inner end of bottom central protrusion; forming flange of wall by applying axial effort to its end and increasing thickness of wall with constant diametrical size at its inner side; then finally shaping blank by expanding annular protrusion on cup bottom to other flange at expanding blank wall from inside; forming flange in bottom part of bush at limiting outer diameter and increasing thickness; increasing height of central bottom protrusion while decreasing its thickness; performing heat treatment and mechanical working of bushings.

EFFECT: enhanced quality of ready bushes due to their improved strength characteristics.

3 cl, 2 dwg, 1 ex