FIELD: machine building.
SUBSTANCE: invention relates to piercing of blanks. Prevention of defects such as slivers inner surface of hollow sleeve is provided by fact that firing installation comprises a mandrel having a through hole which extends along central axis of mandrel adapted to central portion transmittance sewn workpiece through said through hole, wherein installation has a plurality of rollers placed around mandrel in axial direction, or container for placing workpiece and mandrel with its piercing pressing workpiece in its axial direction.
EFFECT: reducing probability of occurrence of defects.
16 cl, 19 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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