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2 560 471

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(51)

IPC

B21B25/02(2006-01-01)

(21) (22)

Application

2014118205/02, 2014-05-05

(24)

Start date

2014-05-05

(22)

Actual filing date

2014-05-05

(45)

Published

2015-08-20

(72)

Inventor

Valitov Mukhtar ZufarovichTomarev Gennadij IvanovichPersijanov Sergej Valer'Evich

(73)

Holder

Ooo Zavod Burovogo Instrumenta"

ROLLING MILL PIERCING MANDREL CORE Russian patent published in 2015 - IPC B21B25/02

Abstract RU 2560471 C1

FIELD: metallurgy.

SUBSTANCE: piercing mandrel core is composed of tube consisting of rigidly connected pipes and stem. Conical threads are made at adjacent end sections of pipes and stem to mate so that outer and inner end collars are made. Note here that adjacent collars of adjacent units interact. Ratio between OD, pipe wall depth and thread size, that is, mean thread diameter in plane D₀, profile angle φ and thread pitch t are defined by mathematical relationships.

EFFECT: higher hardness, longer life.

2 cl, 4 dwg

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RU 2 560 471 C1

Authors

Valitov Mukhtar Zufarovich

Tomarev Gennadij Ivanovich

Persijanov Sergej Valer'Evich

Dates

2015-08-20—Published

2014-05-05—Filed