EP0882526A2 - Procédé et dispositif pour éviter ou réduire des évasements en forme de trompette à l'extrémité d'un tube lors du laminage oblique de tubes à parois minces - Google Patents

Procédé et dispositif pour éviter ou réduire des évasements en forme de trompette à l'extrémité d'un tube lors du laminage oblique de tubes à parois minces Download PDF

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Publication number
EP0882526A2
EP0882526A2 EP98250181A EP98250181A EP0882526A2 EP 0882526 A2 EP0882526 A2 EP 0882526A2 EP 98250181 A EP98250181 A EP 98250181A EP 98250181 A EP98250181 A EP 98250181A EP 0882526 A2 EP0882526 A2 EP 0882526A2
Authority
EP
European Patent Office
Prior art keywords
rolling
rollers
mill
roller
reduction
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.)
Granted
Application number
EP98250181A
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German (de)
English (en)
Other versions
EP0882526B1 (fr
EP0882526A3 (fr
Inventor
Jürgen Dr.-Ing. Pietsch
Torsten Frank
Ingo Baade
Frank Dipl.-Ing. Salomon
Walter Dipl.-Ing. Randerath
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.)
SMS Siemag AG
Original Assignee
Mannesmann AG
SMS Demag 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, SMS Demag AG filed Critical Mannesmann AG
Publication of EP0882526A2 publication Critical patent/EP0882526A2/fr
Publication of EP0882526A3 publication Critical patent/EP0882526A3/fr
Application granted granted Critical
Publication of EP0882526B1 publication Critical patent/EP0882526B1/fr
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
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills

Definitions

  • the invention relates to a method and an apparatus for performing the Procedure for avoiding or reducing trumpet-shaped widenings on Pipe end when diagonally rolling thin-walled pipes on an Assel mill.
  • the driving force for this expansion is the material displacement per unit of time that occurs in the absence of longitudinal tensile stress, which is mainly influenced by the size of the wall reduction and the feed angle, whereby the geometry of the hollow block used also plays an important role in preventing the unwanted material flow. If the wall thickness of the bobble exceeds a certain dimension or its ratio D L / S L falls below a certain amount, for example 10, the expansion-related formation of trumpets on the bobble head is small or practically imperceptible.
  • the object of the present invention is to provide a method and an apparatus for Perform the method to find the one with which the trumpet-shaped Expansion of thin-walled blanks at their front end when rolled into one Woodlice mill avoided or at least in its dimensions on a harmless Dimension can be reduced.
  • the invention proposes that when the front hollow block area in the Assel mill the radial forming of the blanks reduced compared to the stationary rolling condition and / or that Section modulus at the head end due to obstruction of the tangential material flow is increased. This will be in the transient Phase during the rolling of the tube blank in the wood mill, conditions created, that come close to the stationary rolling condition.
  • the material flow in tangential Direction is reduced so that the missing tension in the axial direction is partially compensated. The result is a reduction depending on the tube wall thickness or avoided formation of trumpets at the front end of the cap.
  • the opening path ⁇ DHP is therefore upwards limited that the gripping of the hollow block by the rollers in the inlet part or in The stretched part must still be guaranteed. If necessary, gripping the slug in supported or forced the rollers by pressing with the hollow block inserter will.
  • all rollers should be in the starting position by the same amount be open and at the same time after triggering a signal or command End position to be closed.
  • Another possibility is to reduce the stretch in the circumferential direction in reducing the feed angle of the rolls when rolling or otherwise expressed, the rolling with a smaller feed angle, as it is to avoid triangulation is practiced at the back end of the head.
  • the feed angle of the Rolling reduced to 0 ° to 5 °, preferably to 3 ° to 4 °.
  • Dome pole with a conical or cylindrical front end with rounded or angled transition is positioned so that the Wall thickness reduction is reduced.
  • the rolling then takes place with a initial wall thickness reduction of about 0.5 to 3 mm, which also causes the Widening of the front tube end is reduced.
  • a device for performing the method is characterized in that at least one of the rolls, preferably all rolls of the wood mill, with hydraulic quick release or quick closing devices are provided with which the rollers can also be adjusted radially to the rolling stock against the rolling force in a short time are, the closing path of each sliding roller at most the respective Shoulder height or the maximum wall thickness reduction.
  • the device according to the invention must be able to roll in to reduce the distance between the rollers for a short time, from partially open to the closed state (in the working position).
  • the closing path should preferably be infinitely variable or in small increments of preferably 0.5 to 1 mm. This can e.g. through a stroke limitation, such as the addition of spacers, respectively.
  • the closing process must be triggered automatically by a signal or how it is Invention provides can be initiated by an automatic control.
  • a signal for control of the closing process the increase in the armature current in the drive motor below Use of a timer is usable.
  • the signal to control the closing process from one to the Transport path of the tube switch switched radiation sensor is removable. So can a thermal or radiation sensor (a photo cell) immediately before the inlet of the Hollow block inserted between the rollers or from the outlet side will.
  • the time from the detection of the hollow block to the exit from the Forming zone or until the rollers start to close should be calculated approximately, but should be better for each shell dimension can be determined empirically under constant technological conditions.
  • FIG. 1 is the stationary phase for rolling a tube blank shown.
  • A denotes the woodlouse
  • B denotes a cylindrical one Dome pole inside the tube; the direction of rolling is given at WR.
  • the in Hollow block C introduced in the rolling direction is turned into the blank D in the wood lapping process rolled out.
  • the woodlouse is composed of the inlet part G, the stretching part and the Shoulder E, the smoothing part F and the outlet and rounding part H together.
  • X is denotes the outlet-side wall at the front end of the cap.
  • FIG. 3 shows the proposal according to the invention for an Assel rolling mill, which includes a roller quick-locking device.
  • the same parts are the same designated.
  • the outlet-side front end of the bobbin is labeled D1.
  • the Rolling takes place as shown in the drawing figure with partially opened rollers, see above that at the front end D1 a head with a thicker wall than that Target wall thickness D ( Figure 1) results.
  • the tendency to form trumpets becomes strong Dimensions hindered or restricted by the main driver of the expansion, the Wall reduction, is greatly reduced when rolling on.
  • the done Rolling i.e. after the first filling of the forming zone is finished the work rolls as quickly as possible by moving them into their end positions or Desired working position driven. This state is shown in Figure 4. Now that can Should be rolled wall D2, the target diameter is set.
  • This Procedure can be practiced by opening and closing with a roller or is carried out simultaneously with two or three rollers. This is preferred Closing and opening with all three rollers.
  • FIGs 5 and 6 Another possibility for carrying out the method according to the invention is in Figures 5 and 6 shown.
  • One of the conical or in the form of a cylindrical heel with a rounded or angled transition trained dome rod B used, which is positioned during rolling ( Figure 5) must be that in the beginning only a wall thickness reduction of approx. 0.5 to 3 mm he follows. This also reduces the expansion; a thicker wall is created on front end of the head.
  • FIG. 6 shows, after the rolling and filling of the forming zone, the The dome rod is pushed forward and in the stationary rolling process the target slab wall generated.
  • both cases i.e. in the procedural steps after the Figures 3 and 4 as in Figures 5 and 6 can be those shown in Figure 2 Avoid trumpet-like flared ends, because according to the invention radial deformation of the billet is reduced compared to the stationary rolling condition and the section modulus at the head end Hindrance of the tangential material flow is increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
EP98250181A 1997-06-03 1998-05-26 Procédé et dispositif pour éviter ou réduire des évasements en forme de trompette à l'extrémité d'un tube lors du laminage oblique de tubes à parois minces Expired - Lifetime EP0882526B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19724233A DE19724233C2 (de) 1997-06-03 1997-06-03 Verfahren zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren und Vorrichtung zur Durchführung des Verfahrens
DE19724233 1997-06-03

Publications (3)

Publication Number Publication Date
EP0882526A2 true EP0882526A2 (fr) 1998-12-09
EP0882526A3 EP0882526A3 (fr) 2002-02-06
EP0882526B1 EP0882526B1 (fr) 2003-10-01

Family

ID=7831905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98250181A Expired - Lifetime EP0882526B1 (fr) 1997-06-03 1998-05-26 Procédé et dispositif pour éviter ou réduire des évasements en forme de trompette à l'extrémité d'un tube lors du laminage oblique de tubes à parois minces

Country Status (3)

Country Link
EP (1) EP0882526B1 (fr)
AT (1) ATE250990T1 (fr)
DE (2) DE19724233C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1008400A3 (fr) * 1998-12-10 2003-08-20 SMS Demag AG Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69326455T2 (de) 1993-07-01 2000-01-20 Schneider (Europe) Gmbh, Buelach Arzneigeräte für die Behandlung von Blutgefässen mittels ionisierungsbestrahlung
DE69413209T2 (de) 1994-06-10 1999-03-04 Schneider Europ Gmbh Arzneigerät für die Behandlung eines Teiles von Körpergefäss mittels Ionisierungsbestrahlung
DE69426071T2 (de) 1994-06-24 2001-05-10 Schneider (Europe) Gmbh, Buelach Arzneigerät für die Behandlung eines Teiles eines Körpergefässes mittels Ionisierungsbestrahlung
US6234951B1 (en) 1996-02-29 2001-05-22 Scimed Life Systems, Inc. Intravascular radiation delivery system
US5855546A (en) 1996-02-29 1999-01-05 Sci-Med Life Systems Perfusion balloon and radioactive wire delivery system
US6676590B1 (en) 1997-03-06 2004-01-13 Scimed Life Systems, Inc. Catheter system having tubular radiation source
US6019718A (en) 1997-05-30 2000-02-01 Scimed Life Systems, Inc. Apparatus for intravascular radioactive treatment
US6413203B1 (en) 1998-09-16 2002-07-02 Scimed Life Systems, Inc. Method and apparatus for positioning radioactive fluids within a body lumen
US6352501B1 (en) 1999-09-23 2002-03-05 Scimed Life Systems, Inc. Adjustable radiation source
US6398709B1 (en) 1999-10-19 2002-06-04 Scimed Life Systems, Inc. Elongated member for intravascular delivery of radiation
US6416457B1 (en) 2000-03-09 2002-07-09 Scimed Life Systems, Inc. System and method for intravascular ionizing tandem radiation therapy
DE10334011B3 (de) * 2003-07-25 2004-08-12 Sms Meer Gmbh Walzwerk zur Herstellung eines nahtlosen Rohres
DE10338110A1 (de) * 2003-08-15 2005-03-10 Biomet Deutschland Gmbh Mit Chitosan beschichteter metallischer Gegenstand sowie Verfahren zu dessen Herstellung
RU2368440C1 (ru) * 2008-10-20 2009-09-27 ОАО "Волжский трубный завод" Способ горячей прокатки бесшовных тонкостенных труб
RU2441722C1 (ru) * 2010-12-21 2012-02-10 Александр Васильевич Гончарук Способ производства бесшовных труб на агрегате со станами винтовой прошивки и непрерывным станом продольной прокатки
DE102022004111B4 (de) 2022-11-03 2024-09-26 Zhozef Rotenberg Verfahren zum Schrägwalzen von Rohlingen mit der im Walzkaliber wirkenden axialen Zugkraft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1939778A1 (de) * 1969-08-05 1971-02-18 Deutsche Edelstahlwerke Ag Vorrichtung an Schulterwalzwerken zum Streckwalzen von Rohren
DE2219941C3 (de) * 1972-04-20 1975-05-15 Mannesmann-Meer Ag, 4050 Moenchengladbach Dreiwalzen - Schrägwalzwerk zur Herstellung von Rohren, vorzugsweise zur Herstellung von dünnwandigen Rohren mit verdickten Enden
DE3622678A1 (de) * 1985-07-12 1987-01-15 Kocks Technik Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen
DE4428530C5 (de) * 1994-08-12 2005-11-10 Kocks Technik Gmbh & Co. Kg Verfahren und Walzgerüst zum Schrägwalzen von Rohren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1008400A3 (fr) * 1998-12-10 2003-08-20 SMS Demag AG Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube

Also Published As

Publication number Publication date
EP0882526B1 (fr) 2003-10-01
ATE250990T1 (de) 2003-10-15
DE59809767D1 (de) 2003-11-06
DE19724233C2 (de) 2003-10-16
EP0882526A3 (fr) 2002-02-06
DE19724233A1 (de) 1998-12-10

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