DE3545942C1 - Rolling mandrel drive on elongators for hollow blooms - Google Patents

Rolling mandrel drive on elongators for hollow blooms

Info

Publication number
DE3545942C1
DE3545942C1 DE19853545942 DE3545942A DE3545942C1 DE 3545942 C1 DE3545942 C1 DE 3545942C1 DE 19853545942 DE19853545942 DE 19853545942 DE 3545942 A DE3545942 A DE 3545942A DE 3545942 C1 DE3545942 C1 DE 3545942C1
Authority
DE
Germany
Prior art keywords
rolling
rolling mandrel
tube blank
hollow
elongators
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
Application number
DE19853545942
Other languages
German (de)
Inventor
Michael Dr.-Ing. 4050 Mönchengladbach Graefe
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
Priority to DE19853545942 priority Critical patent/DE3545942C1/en
Application granted granted Critical
Publication of DE3545942C1 publication Critical patent/DE3545942C1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels

Abstract

The invention relates to the operation of the rolling mandrel drive in the rotational and longitudinal direction of the held rolling mandrel on two- or multi-roll elongators for stretching hollow blooms to give thin-walled hollow tube blanks in the production of seamless tubes. In order to increase the ratio of the hollow tube blank diameter to its wall thickness in the stretching of thick-walled hollow blooms to give thin-walled hollow tube blanks, it is necessary to adopt a special method of operating the rolling mandrel drive. The object on which the invention is based is therefore, while ensuring a favourable influence on the stressing of the material, to achieve a higher tube blank diameter/tube blank wall thickness ratio than hitherto. For this purpose, it is proposed that a torque be transmitted to the rolling mandrel during the rolling of the central portion of the rolling stock and/or that the rolling mandrel be retarded in the direction of rotation, shortly before the rolling down of the foot end of the tube blank, to a speed below the rotational exit speed of the rolling stock and is simultaneously accelerated in the rolling direction to the exit speed of the rolling stock.

Description

Patentansprüche: 1. Walzstangenantrieb zum Drehen und Längsverschieben der gehaltenen Walzstange an Zwei- oder Mehrwalzen-Elongatoren zum Strecken von Hohlblöcken zu dünnwandigen Luppen bei der Herstellung nahtloser Rohre, d a d u r c h g e k e n n -z e i c h n e t, daß der Walzstange während des Durchwalzens des mittleren Walzgutabschnittes ein Drehmoment übertragen wird und/oder daß die Walzstange kurz vor dem Abwalzen des Fußendes der Luppe in Drehrichtung auf eine Drehzahl unter der Walzgutauslaufdrehzahl verzögert und gleichzeitig in Walzrichtung auf Walzgut-Auslaufgeschwindigkeit beschleunigt wird.Claims: 1. Rolling rod drive for turning and longitudinal displacement the held roller rod on two- or multi-roller elongators for stretching Hollow blocks to thin-walled blanks in the manufacture of seamless tubes, d a d u r c h g e k e n n -z e i c h n e t that the rolling rod during the rolling through of the middle rolling stock section, a torque is transmitted and / or that the Rolling rod shortly before the rolling of the foot end of the hollow in the direction of rotation on a Speed below the rolling stock run-out speed decelerated and at the same time in the rolling direction is accelerated to the rolling stock exit speed.

2. Antrieb nach Anspruch 1, dadurch gekennzeichnet, daß zur Steuerung des Drehmomentes der Walzstange während des Durchwalzens des mittleren Rohrabschnittes die gemessenen und ausgewerteten Drehzahlverläufe der Walzstange, der Luppe und ggf. des Hohlblockes verwertet werden. 2. Drive according to claim 1, characterized in that for control of the torque of the rolling rod during the rolling of the central pipe section the measured and evaluated speed curves of the rolling rod, the hollow and if necessary, the hollow block can be recycled.

3. Antrieb nach Anspruch 1, dadurch gekennzeichnet, daß zur Steuerung des Drehmomentes der Walzstange während des Durchwalzens des mittleren Rohrabschnittes die gemessenen und ausgewerteten Drehmomentverläufe an der Walzstange und ggf. an den Walzen bzw. die Walzkräfte und/oder Antriebsleistungen an den Walzen benutzt werden. 3. Drive according to claim 1, characterized in that for control of the torque of the rolling rod during the rolling of the central pipe section the measured and evaluated torque curves on the rolling rod and, if necessary, on the rollers or the rolling forces and / or drive powers used on the rollers will.

Die Erfindung betrifft einen Walzstangenantrieb nach dem Oberbegriff des Anspruchs 1. The invention relates to a roller bar drive according to the preamble of claim 1.

Um beim Strecken von dickwandigen Hohlblöcken zu dünnwandigen Luppen die Verhältnisse von Luppendurchmesser zur Luppenwanddicke zu vergrößern bzw. To be used when stretching thick-walled hollow blocks to thin-walled blanks to increase or increase the ratio of the diameter of the bell to the wall thickness of the bell.

die Fehlerrate zu verringern, ist es erforderlich, eine besondere Arbeitsweise des Walzstangenantriebes vorzusehen. Es ist bekannt (US 24 80 381), die Lochdornstange in Schrägwalzwerken in Drehrichtung anzutreiben, um das Anwalzen im Schrägwalzwerk zu erleichtern. Um das Ausziehen der Walzstange nach dem Strecken zu sehr dickwandigen Luppen zu erleichtern, wird in Assel-Walzwerken mit rückwärts bewegter Walzstange gearbeitet. Außerdem ist es bekannt, mit frei schwimmender, mit stehender und mit zurückgezogen nachfahrender Walzstange zu arbeiten.To reduce the error rate, it is necessary to use a special To provide for the operation of the roller bar drive. It is known (US 24 80 381), to drive the piercer bar in cross-rolling mills in the direction of rotation in order to start rolling to facilitate in the piercing mill. About pulling out the rolling rod after stretching To facilitate very thick-walled blanks is used in Assel rolling mills with backwards moving roller bar worked. It is also known to use free-floating, to work with a standing roller bar and with a retracted roller bar.

Es wurde festgestellt, daß dünnwandigere Luppen in Elongatoren hergestellt werden können, wenn kurz vor dem Abwalzen des Luppenfußendes die Walzen gelüftet werden und/oder der Walzgut-Vorschubwinkel verringert wird. Bestehende Schwierigkeiten beim An-oder Abwalzen konnten beispielsweise durch Absenkung der Walzendrehzahl behoben werden. It has been found that thinner-walled blanks are made in elongators can be if the rollers are lifted shortly before the rolling of the Luppenfußend and / or the rolling feed angle is reduced. Existing difficulties during rolling on or off, for example, by lowering the roll speed be resolved.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei günstig beeinflußter Werkstoffbeanspruchung ein höheres Luppendurchmesser-Luppenwanddickenverhältnis als bisher zu erreichen. The present invention is based on the object at low influenced material stress a higher shell diameter-shell wall thickness ratio than before to achieve.

Zur Lösung der Aufgabe werden die im kennzeichnenden Teil des ersten Patentanspruchs beschriebenen Maßnahmen vorgeschlagen. To solve the problem, those in the characterizing part of the first Claim described measures proposed.

Durch Aufbringen eines Drehmomentes auf die Walzstange während des Durchwalzens des mittleren Walzgutabschnittes entsteht ein minimales Torsionsmoment in dem Walzgutquerschnitt am Beginn der Glättzone der Walzen. Dadurch wird die Werkstoffbeanspru- chung günstig beeinflußt. Wenn kurz vor tlcm Abw,ilzi des Fußendes der Luppe die Walzstange eine Ucschlcunigung in Längsrichtung auf Walzgut-Auslaufgcschwindigkeit erfährt, wird damit der Werkstofffluß in l ängsrichtung gefördert. Eine gleichzeitige Verzögerung dci. By applying a torque to the roller bar during the Rolling through the middle section of rolling stock results in a minimal torsional moment in the rolling stock cross-section at the beginning of the smoothing zone of the rolls. This reduces the material stress chung favorably influenced. If shortly before the half-inch deviation of the foot end of the hollow, the roller bar experiences a reciprocation in the longitudinal direction to the rolling stock discharge speed, the material flow is thus promoted in the longitudinal direction. A simultaneous delay dci.

Walzstange in Drehrichtung verringert den Werkstofífluß in Umfangsrichtung bzw. eine zu große Durchmcsseraufweitung des Luppenendes.Rolling rod in the direction of rotation reduces the flow of material in the circumferential direction or too large a widening of the diameter of the shell end.

Zur Steuerung des Drehmomentes der Walzstange während des Durchwalzens des mittleren Rohrabschnittes können nach einem anderen Merkmal die gemesscnen und ausgewerteten Drehzahlverläufe der Walzstange, der Luppe und ggf. des Hohlblocks verwertet werden. Es ist auch nach einem weiteren Merkmal der Erfindung denkbar, daß die Drehmomentverläufe an der Walzstange und ggf. an den Walzen verwendet werden, wobei anstelle der Drehmoment an den Walzen die Walzkräfte und/oder die Antriebsleistung benutzt werden können. For controlling the torque of the rolling rod during rolling of the middle pipe section can be measured and measured according to another feature evaluated speed curves of the rolling rod, the hollow and possibly the hollow block be recycled. It is also conceivable according to a further feature of the invention, that the torque curves are used on the rolling rod and, if necessary, on the rollers, where instead of the torque on the rollers, the rolling forces and / or the drive power can be used.

Claims (1)

Durch die mit der Erfindung vorgeschlagenen Maßnahmen lassen sich gegenüber dem Stand der Technik höhere Luppendurchmesser-Luppenwanddicken verhältnisse erreichen, so daß Luppen mit höheren Durchmesser-Wanddickenverhältnissen als bisher ohne Fußende mit erhöhter Wanddicke erzeugt werden können. The measures proposed with the invention can Compared to the prior art, the ratio of the diameter to the wall thickness is higher achieve, so that bulbs with higher diameter-wall thickness ratios than before can be created without a foot end with increased wall thickness.
DE19853545942 1985-12-23 1985-12-23 Rolling mandrel drive on elongators for hollow blooms Expired DE3545942C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853545942 DE3545942C1 (en) 1985-12-23 1985-12-23 Rolling mandrel drive on elongators for hollow blooms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853545942 DE3545942C1 (en) 1985-12-23 1985-12-23 Rolling mandrel drive on elongators for hollow blooms

Publications (1)

Publication Number Publication Date
DE3545942C1 true DE3545942C1 (en) 1986-11-20

Family

ID=6289481

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853545942 Expired DE3545942C1 (en) 1985-12-23 1985-12-23 Rolling mandrel drive on elongators for hollow blooms

Country Status (1)

Country Link
DE (1) DE3545942C1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480381A (en) * 1945-12-20 1949-08-30 Nat Tube Co Thrust bearing for seamless tube mills and the like
DE3618949A1 (en) * 1985-07-12 1987-01-15 Kocks Technik METHOD FOR CROSS ROLLING SEAMLESS TUBE TUBE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480381A (en) * 1945-12-20 1949-08-30 Nat Tube Co Thrust bearing for seamless tube mills and the like
DE3618949A1 (en) * 1985-07-12 1987-01-15 Kocks Technik METHOD FOR CROSS ROLLING SEAMLESS TUBE TUBE

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