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2 250 147

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IPC

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Application

2004100259/02, 2004-01-09

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Start date

2004-01-09

(22)

Actual filing date

2004-01-09

(45)

Published

2005-04-20

(72)

Inventor

Pumpjanskij D.A.Marchenko L.G.Fadeev M.M.Marchenko K.L.Romantsev B.A.Bagaev N.F.Poljakov K.A.Fiskin B.M.Goncharuk A.V.

(73)

Holder

Zakrytoe Aktsionernoe Obshchestvo Prom Torg"

METHOD FOR HELICAL PIERCING OF CAST BILLET Russian patent published in 2005 - IPC

Abstract RU 2250147 C1

FIELD: rolled stock production, plastic working of metals, namely helical piercing processes.

SUBSTANCE: method comprises steps of guiding heated billet to working rolls turned by angle of feeding and expansion; piercing billet by means of plug mounted in pass formed by rolls and guiding tool. Feed angle value is in range 12 - 18°; expansion angle value is in range 6 - 10°. Reduction degree in restriction portion is in range 21 -35 % and it is realized with use of rolls having inlet cone angle equal to 4 -8°. Reduction degree of billet in front of nose of plug is normalized by means of mathematical expression given in description of invention.

EFFECT: possibility for making tubes with high accuracy geometry size and high quality inner and outer surfaces.

1 dwg, 1 ex

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RU 2 250 147 C1

Authors

Pumpjanskij D.A.

Marchenko L.G.

Fadeev M.M.

Marchenko K.L.

Romantsev B.A.

Bagaev N.F.

Poljakov K.A.

Fiskin B.M.

Goncharuk A.V.

Dates

2005-04-20—Published

2004-01-09—Filed