US3911714A - Method of automatically rotating a hollow shell in a plug mill - Google Patents

Method of automatically rotating a hollow shell in a plug mill Download PDF

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Publication number
US3911714A
US3911714A US493782A US49378274A US3911714A US 3911714 A US3911714 A US 3911714A US 493782 A US493782 A US 493782A US 49378274 A US49378274 A US 49378274A US 3911714 A US3911714 A US 3911714A
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US
United States
Prior art keywords
return
rolls
roll
rolled tube
rolled
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US493782A
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English (en)
Inventor
Haruo Kamimura
Toshitsugu Nakai
Katsumi Wadano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
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Nippon Kokan Ltd
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3911714A publication Critical patent/US3911714A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
    • B21B17/12—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills in a discontinuous process, e.g. plug-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/20—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands
    • B21B39/28—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands by means of guide members shaped to revolve the work during its passage

Definitions

  • ABSTRACT In a plug mill following a Mannesmann piercing mill on a seamless tube production line, a method whereby the rolled hollow shell which has been subjected to the first rolling pass is automatically rotated about its longitudinal central axis by an angle of about 90 while it is being returned to the inlet. V-table of the plug mill for the second rolling pass.
  • the present invention relates to a method whereby in a plug mill following a Mannessmann piercing mill on a seamless tube production line, the rolled hollow shell which has been subjected to the first rolling pass thus having fin-like sides in section, is rotated about its longitudinal central axis by an angle of about 90before I the second rolling pass which is effected using the same 'roll calibers and replacing only the plug with another plug.
  • the roll caliber means the shape of the grooves in each of the pair of opposed work rolls in the plug mill.
  • the bottom roll of the pair of return rolls of a return roll means located to the rear of the plug mill having a pair of work rolls is in its lowered position during the rolling operation of the plug mill.
  • the top work roll of the plug mill is elevated and the bottom return roll of the return roll means is elevated by a lifting mechanism. Consequently, the rolled hollow shell is gripped firmly between the pair of return rolls so that the rotation of the return rolls returns the rolled hollow shell to the inlet V-table of the plug mill.
  • each of the top and bottom work rolls of the plug mill is made circular onlywith respect to about 120 of its center angle and the remaining angular portions each have a relief formed therein to facilitate the rolling operation, these relief portions produce during the first rolling pass fins on both sides of the hollow shell which make the wall thickness of the shell nonuniform, and therefore it is necessary to rotate the rolled hollow shell by an angle of 90 before the second rolling pass is started so that the fin portions of the rolled hollow shell are rolled during the second rolling pass to provide a uniform wall thickness by the second rolling pass.
  • FIG. 1 is a general plan view showing a plug mill and return roll means as well as associated tables;
  • FIG. 2 is a front elevation showing the return roll means of FIG. 1 comprising a pair of rolls as viewed in the direction of the arrow II II;
  • FIG. 3 is a schematic view showing the manner in which the matching roll calibers of the top and bottom return rolls of said return roll means are shifted relative to each other;
  • FIG. 4 is a sectional view showing an exemplary form of the non-driven side bearing section of the top return roll of said return r'oll means.
  • FIG. 5 is a sectional view showing an exemplary form of the non-driven side bearing section of the bottom return roll of said return roll means.
  • FIG. 1 showing the arrangement of a plug mill, return roll means 7 and an inlet V-table 3, a material converted into a hollow shell 1 by a Mannessmann piercing mill (not shown) is kicked out onto inclined skid rails 2, and the hollow shell 1 is moved forward while rolling over the inclined skid rails 2.
  • a pusher 4 After the hollow shell 1 has eventually fallen into an inlet V-table 3, the hollow shell 1 is pushed forward longitudinally and fed between top and bottom work rolls of the plug mill 5 by a pusher 4, and it is then subjected to the first rolling pass in the plug mill 5.
  • a bottom return roll 9 of return roll means 7 is held in its lowered position during thefirst rolling pass of the plug roll mill 5 and as soon as the first rolling pass is over, the bottom return roll 9 of the return roll means 7 is elevated and the rolled hollow shell 1 is gripped by the top and bottom return rolls 8 and 9 which are then rotated to feed the rolled hollow shell 1 back to the inlet V-table 3 through the top and bottom work rolls of the plugmill 5.
  • the rolled hollow shell I is not affected by the plug mill 5, since its top work roll is in its elevated position.
  • the rolled hollow shell is again pushed forward by the pusher 4 and it is fed to the plug mill 5 for the second rolling pass.
  • the automatic rotation by of a rolled hollow shell according to the present invention is accomplished during the return stroke when the rolled hollow shell that has been subjected to the first rolling pass is returned to the inlet ⁇ /-table 3 by the return roll means 7.
  • the return roll means 7 automatically rotates the rolled hollow shell about 90 during its return stroke by means of its special structure including a nondriven side bearing section 10 on one end of the shaft of the top return roll 8 and a driven side bearing section 11 on the other end thereof, and a non-driven thrust locking mechanism 12 of the bottom return roll 9 for preventing the movement of the roll 9 in the direction of the center line of its shaft.
  • the non-driven side bearing section 10 as shown in FIG.
  • a roll shaft 17 of the top return roll 8 is mounted in roll-neck bearings 13 which are mounted in a bearing chock 14.
  • the rollneck bearings 13 consist of needle bearings, thus permitting the axial movement of the roll shaft 17.
  • a pusherplate 16 formed with a threaded hole in the central portion thereof is provided on the outside of the bearing chock 14 on itscenter line, and a screw shaft push rod 15 having a rotary center at one end thereof and a square turning head at the other end thereof is threadedly mounted in the threaded hole of the pusher plate 16 to move the roll shaft 17 and hence the top return roll 8 in the axial direction by the turning of the square head.
  • the driven side bearing sections 11 and 6 employ needle bearings to permit the axial movement of the associated roll shafts.
  • the roll shaft of the bottom return roll 9 is mounted, as shown in FIG. 5, in thrust bearings 18 and 19 of the thrust locking mechanism 12 for exerting a thrust in the direction of the center line of the bottom return roll shaft, and in this way the axial movement of the bottom return roll 9 is prevented. It should be noted that it is possible to arrange the component elements of the above-described automatic shell rotating mechanism in an inverse relation relative to the top and bottom return rolls to obtain the same results.
  • the rolled hollow shell that has been subjected to the first rolling pass can be rotated during its return stroke to the inlet V-table so that the horizontal fin-like portions of the shell are placed in the desired vertical positions.
  • top and bottom return rolls 8 and 9 were slightly slid or displaced axially relative to each other to exert a turning moment on the rolled hollow shell
  • the roll shafts of the top and bottom return rolls 8 and 9 may be arranged as shown by the dot and chain lines in FIG. 1 so that the roll shafts cross each other at small angles at the center of the roll calibers through which the rolled hollow shell is passed so as to similarly exert a turning moment on the rolled hollow shell.
  • this crossing angle a is in the range 1 to 5.
  • the matching roll calibers of the top and bottom return rolls 8 and 9 of the return roll means 7 may be displaced from each other by an amount A, or the roll shafts of the top and bottom return rolls 8 and 9 may be arranged to cross each other at small angles at the center of the roll calibers through which the rolled hollow shell is passed, or both of these methods may be employed together so that the contacting time between the top and bottom return rolls 8 and 9 of the return roll means 7 is controlled by means of a timer or the like to automatically rotate the rolled hollow shell by an angle of predetermined degrees during its return stroke to the inlet side of the plug mill.
  • the present invention has among its great advantages the fact that with only a simple modification of the conventional equipment, it is possible to lessen the amount of work required for the rolling operation of tubes and thereby to ensure an increased industrial utility of the invention.
  • a tubular product production line including a plug mill, feed means for feeding the product to said plug mill, and return means for returning a rolled hollow shell that has been subjected to a rolling pass in said plug mill to said feed means, said return means including a pair of rotatable return rolls located at the outlet side of said plug mill, a rolling method comprisfeeding a tube to said plug mill;
  • said rotating step comprises rotatably driving at least one of said rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
US493782A 1973-08-23 1974-08-01 Method of automatically rotating a hollow shell in a plug mill Expired - Lifetime US3911714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48093859A JPS5143991B2 (enExample) 1973-08-23 1973-08-23

Publications (1)

Publication Number Publication Date
US3911714A true US3911714A (en) 1975-10-14

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Application Number Title Priority Date Filing Date
US493782A Expired - Lifetime US3911714A (en) 1973-08-23 1974-08-01 Method of automatically rotating a hollow shell in a plug mill

Country Status (6)

Country Link
US (1) US3911714A (enExample)
JP (1) JPS5143991B2 (enExample)
BR (1) BR7406994D0 (enExample)
DE (1) DE2438833A1 (enExample)
ES (1) ES429441A1 (enExample)
IT (1) IT1019938B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412974A (en) * 1992-04-16 1995-05-09 Mannesmann Aktiengesellschaft Method of producing seamless pipes utilizing a plug rolling procedure
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment
CN107639120A (zh) * 2016-07-22 2018-01-30 句容毅马五金制品有限公司 红钢坯自动翻转装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53117883A (en) * 1977-03-24 1978-10-14 Honda Motor Co Ltd Boring device with blade correcting means
JPS57145609U (enExample) * 1981-03-09 1982-09-13
JPS57145608U (enExample) * 1981-03-09 1982-09-13
JPS57173909U (enExample) * 1982-03-24 1982-11-02
CN120362267B (zh) * 2025-06-20 2025-09-09 太原科技大学 一种用于中厚板角轧的钢板转动装置及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9274A (en) * 1852-09-21 Machinery for beveling the edges op skelps or
US662916A (en) * 1899-04-04 1900-12-04 Joseph Daschbach Device for holding rounds in rolling-mills.
US1928811A (en) * 1931-10-22 1933-10-03 Frank J Burns Manipulating mechanism
US2016141A (en) * 1931-04-01 1935-10-01 Bethlehem Steel Corp Rolling mill guide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9274A (en) * 1852-09-21 Machinery for beveling the edges op skelps or
US662916A (en) * 1899-04-04 1900-12-04 Joseph Daschbach Device for holding rounds in rolling-mills.
US2016141A (en) * 1931-04-01 1935-10-01 Bethlehem Steel Corp Rolling mill guide
US1928811A (en) * 1931-10-22 1933-10-03 Frank J Burns Manipulating mechanism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412974A (en) * 1992-04-16 1995-05-09 Mannesmann Aktiengesellschaft Method of producing seamless pipes utilizing a plug rolling procedure
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment
CN107639120A (zh) * 2016-07-22 2018-01-30 句容毅马五金制品有限公司 红钢坯自动翻转装置

Also Published As

Publication number Publication date
JPS5044156A (enExample) 1975-04-21
ES429441A1 (es) 1976-09-01
DE2438833A1 (de) 1975-03-13
IT1019938B (it) 1977-11-30
JPS5143991B2 (enExample) 1976-11-25
BR7406994D0 (pt) 1975-09-09

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