EP0542387B1 - Verfahren zum Längswalzen nahtloser Rohre - Google Patents

Verfahren zum Längswalzen nahtloser Rohre Download PDF

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Publication number
EP0542387B1
EP0542387B1 EP92250328A EP92250328A EP0542387B1 EP 0542387 B1 EP0542387 B1 EP 0542387B1 EP 92250328 A EP92250328 A EP 92250328A EP 92250328 A EP92250328 A EP 92250328A EP 0542387 B1 EP0542387 B1 EP 0542387B1
Authority
EP
European Patent Office
Prior art keywords
roll
wall thickness
pipe
rolling
pass
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
EP92250328A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0542387A1 (de
Inventor
Johann Heinrich Rohde
Burkhart Schifferings
Rolf Kümmerling
Jochen Vochsen
Karl Heinz Häusler
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0542387A1 publication Critical patent/EP0542387A1/de
Application granted granted Critical
Publication of EP0542387B1 publication Critical patent/EP0542387B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21B17/02—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, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—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, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process

Definitions

  • the invention relates to a method for longitudinally rolling seamless tubes in a continuous rolling process using an internal tool in a multi-stand rolling mill, the rolls of the successive stands being installed offset from one another.
  • a rolling process of this type can be found, for example, in US-A-3392565.
  • the prerequisite is that the upstream piercing mill delivers sufficiently long hollow blocks.
  • Modern cross-hole punching machines produce hollow block lengths of 12 meters and more.
  • the wall in the caliber jump of the second roll stand is stretched in the longitudinal direction of the tube and thus drawn thin.
  • a uniform wall thickness over the entire circumference of the pipe can therefore only be achieved if the degree of thinning of the wall in the second roll stand is already taken into account in the wall thickness design in the first roll stand.
  • the uniform wall thickness can be achieved in that the caliber of the first rolling pass is relatively wide open and a large decrease in wall thickness is made possible in the base of the caliber.
  • the finished wall thickness or at least almost the finished wall thickness can already be set in the caliber base of the first rolling caliber. Because the second caliber so far on the caliber flanks If it is opened that the entire or at least the major part of the deformation does not occur as a longitudinal stretching, but migrates as a spread into the caliber flanks, it can be avoided that the wall in the caliber flank of the second pair of rollers is pulled thin.
  • the ovality of the rolled tube is measured after the second rolling pass and the deviation from the setpoint is used as an impulse for regulating the roller speed difference of the drive motors. It makes sense to drive one of the drive motors as a pilot motor with a fixed speed, which serves as a reference variable for the controllable drive of the second roll stand.
  • the invention can be used in an advantageous manner both in continuous rolling mills with a free-running as well as in a controlled following rolling rod.
  • a hollow block which has a length of 12000 mm with a diameter of 183.7 mm and a wall thickness of 13.25 mm.
  • the aspect ratio is approximately 3.47: 1.
  • the hollow block with a length of 12000 mm is then rolled out in the two-stand rolling mill according to the invention with an extension of 2.48: 1, so that there is a diameter of 164 mm of the outgoing pipe with a wall thickness of 5.70 mm.
  • the length of the emerging pipe is approx. 30,000 mm.
  • the roll stand shown is a two-roll stand; the lower roller is a mirror image of the upper roller.
  • the caliber 4 of both rolls is open in the area of the roll caliber flanks 5, ie the radius of the caliber in the area of the Flanks is larger than the radius of the caliber in the roller base 6.
  • the gap 3 between the inner tool 2 and the roller 1 or 2 in the roller caliber base 6 corresponds approximately to the finished wall thickness or slightly more. In the area of the roll caliber flanks 5, the gap between the inner tool 2 and the caliber 4 is larger due to the opening of the roll caliber flanks 5, so that a greater wall thickness is produced in this area than in the area of the roll caliber base 6.
  • FIG. 2 shows the calibration of the second roll pass, the installation position of the rolls at 90 degrees to that of the rolls in FIG. 1 having to be thought of.
  • a clear opening of the roll caliber flanks 5 of the calibration 4 is provided in both calibration alternatives of the right and left half of the drawing, while in the area of the roll caliber base 6 between the inner tool 2 and the rolls 1, the finished tube wall thickness is set.
  • the clear opening of the caliber in the area of the roll caliber flanks 5 causes the flank area 7 emerging from the first roll pass (FIG. 1) to be deformed in the roll caliber base 6 of the second roll pass and, as a result of the lateral opening of the caliber in the flank area, a material flow almost exclusively in width, in the circumferential direction of the tube. This would, as can be seen in FIG. 2, significantly increase the circumference of the tube; an approximate ellipse is created.
  • the pipe is stretched between the two calibres (FIGS. 1 and 2) in the manner according to the invention, which is dimensioned such that the pipe does not spread oval in the manner shown, but rather the material which has the aim of to go in width, in length.
  • the tube 8 rounds itself and lies against the inner tool with little play, as shown in FIG. 3, without the finished wall thickness determined in the roller caliber base being thinly drawn from the first rolling pass.
  • Only a small dilution of the finished wall thickness from the roller caliber base 6 of the first roll pass (FIG. 1) is permissible, ie the finished wall thickness in the first pass can be selected to be slightly larger in order to achieve the finished wall thickness in the caliber base of the second pass after a slight stretch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Steel (AREA)
EP92250328A 1991-11-15 1992-11-10 Verfahren zum Längswalzen nahtloser Rohre Expired - Lifetime EP0542387B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4138178A DE4138178A1 (de) 1991-11-15 1991-11-15 Verfahren zum laengswalzen nahtloser rohre
DE4138178 1991-11-15

Publications (2)

Publication Number Publication Date
EP0542387A1 EP0542387A1 (de) 1993-05-19
EP0542387B1 true EP0542387B1 (de) 1994-09-21

Family

ID=6445205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92250328A Expired - Lifetime EP0542387B1 (de) 1991-11-15 1992-11-10 Verfahren zum Längswalzen nahtloser Rohre

Country Status (7)

Country Link
US (1) US5357773A (ja)
EP (1) EP0542387B1 (ja)
JP (1) JPH08243B2 (ja)
AT (1) ATE111788T1 (ja)
CZ (1) CZ283112B6 (ja)
DE (2) DE4138178A1 (ja)
RU (1) RU2097155C1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4213276C2 (de) * 1992-04-16 1996-05-23 Mannesmann Ag Verfahren zum Herstellen nahtloser Rohre nach dem Stopfenwalzverfahren

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858990A (en) * 1928-04-16 1932-05-17 Globe Steel Tubes Co Method of and means for rolling seamless tubing
US3392565A (en) * 1965-02-15 1968-07-16 Blaw Knox Co Manufacture of seamless tubing
US4002048A (en) * 1975-12-19 1977-01-11 Aetna-Standard Engineering Company Method of stretch reducing of tubular stock
GB1557872A (en) * 1976-09-15 1979-12-12 Shevchenko A A Others method of continuous tube rolling and rolling mill therefor
JPS5747517A (en) * 1980-09-04 1982-03-18 Ishikawajima Harima Heavy Ind Co Ltd Method and apparatus for controlling rolling speed of mandrel mill
IT1168096B (it) * 1981-06-11 1987-05-20 Innocenti Santeustacchio Spa Laminatoio continuo a gabbie incrociate per la produzione di tubi senza saldatura
JPS59104207A (ja) * 1982-12-08 1984-06-16 Kawasaki Steel Corp マンドレルミルにおける鋼管の伸ばし長さ制御方法
JPS6099423A (ja) * 1983-11-02 1985-06-03 Kawasaki Steel Corp 管の連続延伸圧延方法
JPH0714524B2 (ja) * 1987-06-26 1995-02-22 川崎製鉄株式会社 管の連続延伸圧延方法およびその圧延機

Also Published As

Publication number Publication date
DE4138178A1 (de) 1993-05-27
CZ331992A3 (en) 1993-06-16
EP0542387A1 (de) 1993-05-19
CZ283112B6 (cs) 1998-01-14
US5357773A (en) 1994-10-25
JPH05237515A (ja) 1993-09-17
ATE111788T1 (de) 1994-10-15
DE4138178C2 (ja) 1993-08-26
DE59200537D1 (de) 1994-10-27
RU2097155C1 (ru) 1997-11-27
JPH08243B2 (ja) 1996-01-10

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