EP1008400B1 - Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube - Google Patents

Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube Download PDF

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Publication number
EP1008400B1
EP1008400B1 EP99250417A EP99250417A EP1008400B1 EP 1008400 B1 EP1008400 B1 EP 1008400B1 EP 99250417 A EP99250417 A EP 99250417A EP 99250417 A EP99250417 A EP 99250417A EP 1008400 B1 EP1008400 B1 EP 1008400B1
Authority
EP
European Patent Office
Prior art keywords
assel
mandrel
rolling
roll
rolls
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
EP99250417A
Other languages
German (de)
English (en)
Other versions
EP1008400A3 (fr
EP1008400A2 (fr
Inventor
Torsten Frank
Frank Salomon
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
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1008400A2 publication Critical patent/EP1008400A2/fr
Publication of EP1008400A3 publication Critical patent/EP1008400A3/fr
Application granted granted Critical
Publication of EP1008400B1 publication Critical patent/EP1008400B1/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 for reducing trumpet-shaped widenings on front pipe end during the oblique rolling of thin-walled pipes on an Assel mill, at the at the front end between two cylindrical areas conically stepped in In its starting position correspondingly positioned mandrel when entering the front Hollow block area is moved axially controlled in the rolling mill in the rolling mill Assel.
  • the invention is based on the DE 197 24 233 A1 is proposed in the inlet the front hollow block area in the Assel mill the radial deformation of the billet to reduce compared to the stationary rolling condition and / or the moment of resistance of the cross section of the cross section at the head end by obstruction of the tangential material flow to increase.
  • the stationary rolling condition to come close.
  • the flow of material in the tangential direction is reduced, so that the missing tension in the axial direction is partially compensated.
  • the disadvantage here however, that the wall thickness of Tube end enlarged, so that cut a considerable amount of material as scrap must become. It would be better if the material accumulation by increasing the Wall thickness would not arise at all.
  • the object of the present invention is to find a method with which the trumpet-shaped expansion of thin-walled lumps at their front end Rolling in an Assel mill reduced in size to a harmless level can be.
  • the hollow block is at Walzbeginn with his leading edge in front of the shoulder of the weevil rolls.
  • the Mandrel pushed forward at a fixed speed in the rolling direction.
  • the Asselwalzen are moved apart and pivoted so that the Distance between mutually parallel generatrices remains constant from each other, i. the Pipe wall thickness is maintained.
  • the weevil rolls become not further apart.
  • the Asselwalzen so far swung back that now the generatrix of the Glätteils parallel to the generatrix of the (cylindrical) mandrel is located.
  • the distance between the generatrices corresponds to each other furthermore, the rolled tube wall thickness, thickened ends do not occur.
  • the swirling of the weevil rolls takes place about their roll centers, wherein the rolling center points lie on a vertical line of the roll longitudinal axis, which is the Glätteil the rollers in the middle cuts.
  • the two drawing figures give a rough schematic of the conditions in the Asselwalzen a thin-walled tube again. Shown are one of the Asselwalzen 7 and the Mandrel 1, which at its free end a cone 2 of e.g. 150 mm in length and on it then again a cylindrical piece 3 of e.g. 120 mm long. Of the Diameter 4 of this cylindrical piece is e.g. 15 mm smaller than the actual one Mandrel bar diameter 5. The mandrel bar 1 is controlled in the rolling direction 6 Speed adjustable.
  • Figure 1 At the beginning of rolling ( Figure 1) is the mandrel 1 with its cone 2 in a dormant Position between the weevil rolls 7, wherein the end 8 of the conical part under the Shoulder 9 of the weevil rolls 7 is located.
  • the roll longitudinal axis a - a will now be around the Roller center M in the direction of arrow X is pivoted so that the surface line 10 of the Glätteils the Asselwalzen is approximately parallel to the opposite generatrix 11 of the cone 2.
  • the distance between the two lines gives the wall thickness of the rolled tube.
  • a exact parallel position of the generatrices of both bodies arises only if the Transport angle of the weevil rolls is 0 °.
  • the hollow block 14 is located with its front edge 15 in front of the shoulder 9 of the weevils 7.
  • the mandrel 1 is fixed with a Speed advanced in the rolling direction.
  • the weevils 7 become so apart, that the distance between the generatrices 10 and 11 from each other constant remains, i. the pipe wall thickness is maintained.
  • the end of cone 2 is reached, be The Asselwalzen 7 no longer moved apart.
  • the Assel rollers 7 in the direction of arrow Y so far swung back (Fig. 2), that now the generatrix 10 of the Glätteils is parallel to the surface line 13 of the cylindrical part 3 of the mandrel 1.
  • the distance of the generatrices 10 and 13 from each other still corresponds to the rolled Pipe wall thickness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Metal Rolling (AREA)
  • Electric Cable Installation (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Claims (3)

  1. Procédé de réduction des élargissements en forme de trompette à l'extrémité avant de tubes lors du laminage oblique de tubes à paroi mince dans un laminoir Assel, dans lequel le poinçon, qui est étagé en cône entre deux zones cylindriques à son extrémité avant et qui dans sa position de départ est placé de manière appropriée, coulisse dans la direction de laminage en étant commandé axialement lorsque la zone avant du lingot creux pénètre dans le laminoir Assel,
    caractérisé en ce qu'on éloigne l'un de l'autre les cylindres Assel qui, au début du laminage du tube, sont réglés à l'épaisseur de paroi à laminer tout en maintenant leur emprise formée entre le cône du poinçon et la partie lisseuse de chaque cylindre Assel, et ce, en même temps que le poinçon coulisse et de manière analogue à l'allure croissante du cône du poinçon, et en ce qu'on les fait en même temps basculer de sorte que la partie lisseuse du cylindre Assel soit sensiblement parallèle au cône du poinçon.
  2. Procédé selon la revendication 1,
    caractérisé en ce que, au début du laminage, le bord avant du lingot creux se trouve devant l'épaule du cylindre Assel et le poinçon est placé de sorte que, en position de repos, sa partie conique se trouve entre les cylindres Assel et que sa transition de la partie cylindrique mince à la partie conique se trouve sous l'épaule du cylindre Assel.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que le basculement des cylindres Assel a lieu autour de leurs centres de cylindre et en ce que les centres de cylindre se situent sur une perpendiculaire à l'axe longitudinal de cylindre qui coupe la partie lisseuse des cylindres au milieu.
EP99250417A 1998-12-10 1999-11-29 Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube Expired - Lifetime EP1008400B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19858955A DE19858955C2 (de) 1998-12-10 1998-12-10 Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende
DE19858955 1998-12-10

Publications (3)

Publication Number Publication Date
EP1008400A2 EP1008400A2 (fr) 2000-06-14
EP1008400A3 EP1008400A3 (fr) 2003-08-20
EP1008400B1 true EP1008400B1 (fr) 2005-01-05

Family

ID=7891905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99250417A Expired - Lifetime EP1008400B1 (fr) 1998-12-10 1999-11-29 Procédé pour réduire des évasements en forme de trompette à l'extrémité avant d'un tube

Country Status (3)

Country Link
EP (1) EP1008400B1 (fr)
AT (1) ATE286437T1 (fr)
DE (2) DE19858955C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019123836A1 (de) 2019-09-05 2021-03-11 Sms Group Gmbh Schrägwalzaggregat sowie Verfahren zum Anstellen des Walzkalibers eines Schrägwalzaggregats
DE102024002391A1 (de) * 2024-07-23 2026-01-29 Zhozef Rotenberg Verfahren zum Strecken von mittel- und dünnwandigen Luppen in einem Mehrwalzen-Schrägwalzwerk unter dem Einfluss einer inneren axialen Zugkraft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020927A1 (de) * 1980-06-03 1981-12-10 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Schraegwalzwerk zum reduzieren des durchmessers von rohren
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
DE19724233C2 (de) * 1997-06-03 2003-10-16 Sms Demag Ag Verfahren zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren und Vorrichtung zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
EP1008400A3 (fr) 2003-08-20
ATE286437T1 (de) 2005-01-15
DE19858955A1 (de) 2000-06-21
DE19858955C2 (de) 2000-09-28
DE59911403D1 (de) 2005-02-10
EP1008400A2 (fr) 2000-06-14

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