FIELD: metallurgy.
SUBSTANCE: invention refers to metal pressure processing and can be applied in punching of bolts with cavity in bulge part, i.e. in bolthead. Blanc part to be deformed, of relative length within tolerance limits, is placed in the punch cavity. The blanc undergoes upsetting, broaching and shaping by simultaneous application of puncheon and broach. Counterpressure equal to the value of bulge upsetting force is applied to puncheon. Puncheon is shifted in axial direction opposite to broach movement. Shift size is equal to the depth of broached cavity in the bulge.
EFFECT: improved quality of rod parts with a cavity in bulge part.
3 dwg, 1 ex
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