FIELD: metallurgy.
SUBSTANCE: proposed method comprises cutting flat ring blank with bore diameter smaller than that of finished article bottom and forming that blank to produce semi. After cutting bore edges are expanded. Forming flat ring blank to produce semi is effected by flanging to maximum tolerable deformation at bore edge via expansion of fibers tangentially and contraction in crosswise direction. Then, more hardened material of semi bore edge is removed by broaching. Final flanging is performed to produce finished article.
EFFECT: expanded performances, decreased edge drop.
2 dwg
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