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Application

2003103641/02, 2003-02-06

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Start date

2003-02-06

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Actual filing date

2003-02-06

(45)

Published

2005-01-10

(72)

Inventor

Saf'Janov A.V.Fedorov A.A.Ignat'Ev V.V.Lapin L.I.Romantsov I.A.Nenakhov S.V.Panov S.A.Logovikov V.A.

(73)

Holder

Oao Truboprokatnyj Zavod"

METHOD FOR MAKING MANDRELS OF PILGER MILLS Russian patent published in 2005 - IPC

Abstract RU 2243838 C2

FIELD: rolled tube production, namely method for making pilger mill mandrels from heat resistant steel for rolling hot rolled tubes.

SUBSTANCE: method for making mandrels used for rolling hot rolled tubes with large and mean diameters in range 273-550mm comprises steps of casting ingots of hear resistant steel; forging cylindrical solid or hollow blanks, roughly working of them, performing heat treatment and finishing mandrels at forming conicity 1 - 2 mm on length of their working portion while taking into account designed linear expansion coefficient during rolling process; determining diameter size by means of expression δ = dn - Δ/1 + α·t. One portion of mandrel from lock along length of half of working portion of mandrel is in the form of cone with diameters of cone bases determined form given expression and second portion is in the form of cylinder or truncated cone whose diameters are determined according to next expression

EFFECT: lowered lengthwise thickness difference of tubes.

3 cl, 1 dwg, 1 tbl

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RU 2 243 838 C2

Authors

Saf'Janov A.V.

Fedorov A.A.

Ignat'Ev V.V.

Lapin L.I.

Romantsov I.A.

Nenakhov S.V.

Panov S.A.

Logovikov V.A.

Dates

2005-01-10—Published

2003-02-06—Filed