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2 040 988

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IPC

(21) (22)

Application

93025976/02, 1993-05-05

(22)

Actual filing date

1993-05-05

(45)

Published

1995-08-09

(72)

Inventor

Saprygin Kh.M.Klepanda V.V.Mikhajlov S.M.Rjabinkov V.T.Barabantsev G.E.Bosyj V.N.

(73)

Holder

Cherepovetskij Metallurgicheskij Kombinat

METHOD OF MAKING WELDED STRAIGHT-SEAM TUBES Russian patent published in 1995 - IPC

Abstract RU 2040988 C1

FIELD: metal pressure forming. SUBSTANCE: method, providing lowered twisting of longitudinal butt of a tubular blank, comprises steps of lateral bending of an initial crescent-like blank, having concave and convex edges, along shaping transitions in rolls; twisting the blank at least in first intertransition zone around the concave edge with simultaneous applying to it a cross compression effort at a side of its convex edge in such a way, that a value of twisting deformation is no more, than an elastic deformation value of a material of the blank. EFFECT: enhanced quality of straight-seam welded tubes due to lowered twisting of their longitudinal butt upon making process. 1 cl, 9 dwg, 3 tbl

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RU 2 040 988 C1

Authors

Saprygin Kh.M.

Klepanda V.V.

Mikhajlov S.M.

Rjabinkov V.T.

Barabantsev G.E.

Bosyj V.N.

Dates

1995-08-09—Published

1993-05-05—Filed