IT1279193B1 - Perforation/rolling procedure and device for steel ppes without joints - Google Patents

Perforation/rolling procedure and device for steel ppes without joints

Info

Publication number
IT1279193B1
IT1279193B1 IT95TO000363A ITTO950363A IT1279193B1 IT 1279193 B1 IT1279193 B1 IT 1279193B1 IT 95TO000363 A IT95TO000363 A IT 95TO000363A IT TO950363 A ITTO950363 A IT TO950363A IT 1279193 B1 IT1279193 B1 IT 1279193B1
Authority
IT
Italy
Prior art keywords
angle
inclination
way
main cylinder
face
Prior art date
Application number
IT95TO000363A
Other languages
Italian (it)
Inventor
Tomio Yamakawa
Chihiro Hayashi
Kazuhiro Shimoda
Original Assignee
Sumitomo Metal Ind
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Ind filed Critical Sumitomo Metal Ind
Priority to IT95TO000363A priority Critical patent/IT1279193B1/en
Publication of ITTO950363A0 publication Critical patent/ITTO950363A0/en
Publication of ITTO950363A1 publication Critical patent/ITTO950363A1/en
Application granted granted Critical
Publication of IT1279193B1 publication Critical patent/IT1279193B1/en

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  • Metal Rolling (AREA)

Abstract

Procedure for producing steel pipes without weld means of the Mannesmann pipe production process, in which a round ingot is made to pass through a perforator and the centre of the round ingot is perforated to obtain a hollow shell. A pair of disc cylinders is arranged in such a way as to be inclined by an angle of inclination δ with respect to a pass line towards a main cylinder of the conical type arranged on the entrance side, where the material to roll enters into the sliding face of the disc cylinder, thereby becoming non-parallel with respect to the angle of the exit face of the main cylinder, while the angle of inclination δ is fixed in such a way as to meet the following conditions relative to the angle of the inclination δ, to the angle of the entrance face θ1 and to the angle of the exit face θ2 of the main cylinder, in such a way as to obtain an expansion ratio of the external diameter having a value of 1.15 or more: "θ2+2degree<δ<9degree, δ+θl<12degree <IMAGE>
IT95TO000363A 1995-05-09 1995-05-09 Perforation/rolling procedure and device for steel ppes without joints IT1279193B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IT95TO000363A IT1279193B1 (en) 1995-05-09 1995-05-09 Perforation/rolling procedure and device for steel ppes without joints

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT95TO000363A IT1279193B1 (en) 1995-05-09 1995-05-09 Perforation/rolling procedure and device for steel ppes without joints

Publications (3)

Publication Number Publication Date
ITTO950363A0 ITTO950363A0 (en) 1995-05-09
ITTO950363A1 ITTO950363A1 (en) 1996-11-09
IT1279193B1 true IT1279193B1 (en) 1997-12-04

Family

ID=11413537

Family Applications (1)

Application Number Title Priority Date Filing Date
IT95TO000363A IT1279193B1 (en) 1995-05-09 1995-05-09 Perforation/rolling procedure and device for steel ppes without joints

Country Status (1)

Country Link
IT (1) IT1279193B1 (en)

Also Published As

Publication number Publication date
ITTO950363A1 (en) 1996-11-09
ITTO950363A0 (en) 1995-05-09

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Legal Events

Date Code Title Description
0001 Granted