EP0601680B1 - Method of guiding a rough-pierced tube blank - Google Patents

Method of guiding a rough-pierced tube blank Download PDF

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Publication number
EP0601680B1
EP0601680B1 EP93250337A EP93250337A EP0601680B1 EP 0601680 B1 EP0601680 B1 EP 0601680B1 EP 93250337 A EP93250337 A EP 93250337A EP 93250337 A EP93250337 A EP 93250337A EP 0601680 B1 EP0601680 B1 EP 0601680B1
Authority
EP
European Patent Office
Prior art keywords
pipe
rollers
puddled iron
puddled
iron
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
EP93250337A
Other languages
German (de)
French (fr)
Other versions
EP0601680A1 (en
Inventor
Manfred Ing. Grad. Peglau
Paul Ing. Grad. Koenen
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 EP0601680A1 publication Critical patent/EP0601680A1/en
Application granted granted Critical
Publication of EP0601680B1 publication Critical patent/EP0601680B1/en
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
    • 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
    • B21B39/14—Guiding, positioning or aligning work
    • 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
    • B21B19/12—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 parallel to the axis of the work
    • B21B19/16—Rolling tubes without additional rollers arranged inside the tubes
    • 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 guiding a tube blank and reducing its end before it enters an immediately downstream Assel mill, according to the preamble of claim 1.
  • Pre-reduction devices of the generic type are known for example from DE 38 23 135 C 2. They are used to avoid the funnel-shaped, triangular end parts of tubes rolled from tube blanks in Assel rolling mills, which arise due to the process in that the tube end expands when the tube end is rolled. To avoid these trumpet-shaped pipe ends, DE 38 23 135 C 2 proposes to reduce the diameter of the end part of the pipe blank before it enters the reduction zone of the wood mill.
  • a pre-reduction facility will be free rotatable rollers used, which are arranged in a stand as seen in the rolling direction in front of the wood mill, the four rollers distributed over the circumference of the tube blank are centrally adjustable against the tube blank. Shortly before the end part of the tube blank enters this pre-reduction device, the rollers are turned on, thereby reducing the end portion of the tube blank.
  • the existing pre-reduction device is used for the purpose of pushing the short tube blank for rolling between woodleaf rollers, then taking over the tube guidance like a steady rest and finally at the tube end end with the aid of the rollers of the device to be driven centrically in the known manner reduce the tube blank wall thickness to avoid triangulation.
  • the pre-reduction device is therefore also used universally for rolling on the tube blank and for guiding to avoid twisting.
  • rollers are preferably freely rotatably mounted in a stand body, which is longitudinally displaceable with respect to the frame of the pre-reduction device in slide guides by means of piston-cylinder units arranged parallel to the longitudinal axis of the tube blank.
  • Simple sliding guides on both sides of the scaffold body enable the scaffold body to be guided securely by the required stroke of approximately 200 mm.
  • the scaffold body is preferably resiliently supported in the frame in order to be able to compensate for slight deflections as a result of irregularities over the longitudinal direction of the tube blank.
  • a short tube blank 4 lies in front of the front edge 1.
  • the dimension-dependent mandrel bar which can be seen at 2
  • the transport roller table 3 leads the unit consisting of tube blank 4 and mandrel bar 2 into the woodworking mill indicated at 5.
  • the rollers 7 of the pre-reduction device 6 move together centrally and clamp the outer diameter of the tube blank 4, actuated by hydraulic cylinders which are controlled as a function of the path.
  • the two hydraulic piston-cylinder units 8 arranged on the side move the entire pre-reduction device 6 together with the tube blank 4 by one stroke Approx.
  • An infrared eye detects the end of the slug and controls the piston-cylinder units for adjusting the rollers of the pre-reduction device 6 to a set value in a known manner. From a certain point in time, the end of the tube blank is reduced to such an extent that the triangulation of the tube blank 4 described in DE 38 23 135 C 2 and the resulting connector between the woodleaf rollers is prevented.
  • the rollers 7 of the pre-reduction device 6 are opened and the lateral piston-cylinder units 8 move the pre-reduction device back into the starting position for a new working cycle.
  • the pre-reduction device 6 can be used in addition to its actual purpose as a steady rest, i.e. can be used to guide pipe sections.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Führen einer Rohrluppe und Reduzieren ihres Endes vor dem Einlauf in ein unmittelbar nachgeordnetes Asselwalzwerk gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for guiding a tube blank and reducing its end before it enters an immediately downstream Assel mill, according to the preamble of claim 1.

Vorreduktionseinrichtungen der gattungsgemäßen Art sind beispielsweise aus der DE 38 23 135 C 2 bekannt. Sie werden benutzt, um die trichterförmigen, triangularen Endteile von aus Rohrluppen in Asselwalzwerken gewalzten Rohren zu vermeiden, die verfahrensbedingt dadurch entstehen, daß beim Walzen des Rohrendes sich dieses ausweitet. In der DE 38 23 135 C 2 wird zur Vermeidung dieser trompetenförmigen Rohrenden vorgeschlagen, den Durchmesser des Endteils der Rohrluppe vorzureduzieren, ehe er in die Reduktionszone des Asselwalzwerkes einläuft. Als Vorreduktionseinrichtung werden frei drehbare Walzen benutzt, die in Walzrichtung gesehen vor dem Asselwalzwerk in einem Gerüst angeordnet sind, wobei die über den Umfang der Rohrluppe verteilten vier Walzen gegen die Rohrluppe zentrisch verstellbar sind. Kurz vor dem Einlaufen des Endteils der Rohrluppe in diese Vorreduktionseinrichtung werden die Walzen angestellt und dadurch das Endteil der Rohrluppe reduziert. Diese Vorreduktionseinrichtungen haben sich grundsätzlich bewährt.Pre-reduction devices of the generic type are known for example from DE 38 23 135 C 2. They are used to avoid the funnel-shaped, triangular end parts of tubes rolled from tube blanks in Assel rolling mills, which arise due to the process in that the tube end expands when the tube end is rolled. To avoid these trumpet-shaped pipe ends, DE 38 23 135 C 2 proposes to reduce the diameter of the end part of the pipe blank before it enters the reduction zone of the wood mill. As a pre-reduction facility will be free rotatable rollers used, which are arranged in a stand as seen in the rolling direction in front of the wood mill, the four rollers distributed over the circumference of the tube blank are centrally adjustable against the tube blank. Shortly before the end part of the tube blank enters this pre-reduction device, the rollers are turned on, thereby reducing the end portion of the tube blank. These pre-reduction devices have generally proven themselves.

Zum Anwalzen der Rohrluppen im Asselwalzwerk ist es erforderlich, diese soweit zwischen die Asselwalzen zu schieben, daß die Walzen die Rohrluppe ergreifen. Dazu ist es bekannt, die Rohrluppe am Ende verdrehfest einzuspannen und mit dem vorderen Ende in den Walzspalt einzuschieben. Nachteilig ist es, daß die so geklemmte Rohrluppe, wenn sie nicht rechtzeitig losgelassen wird, in der Klemmung verdrallt. Es ist weiterhin bekannt, an der Dornstange eine Anlageschulter vorzusehen, über die die Rohrluppe in den Walzspalt eingeschoben wird. Dies hat den Nachteil, daß die Schulter längenabhängig einstellbar und auf die Dimension der anzuwalzenden Rohrluppe abgestellt, d. h. austauschbar sein muß.To roll the pipe blanks in the woodlouse mill, it is necessary to push them between the woodlice rolls so far that the rollers grip the pipe bladder. For this purpose, it is known to clamp the tube blank at the end so that it cannot rotate and to push it into the roll gap with the front end. It is disadvantageous that the tube clamp clamped in this way, if it is not released in time, twists in the clamp. It is also known to provide a contact shoulder on the mandrel rod, via which the tube blank is inserted into the roll gap. This has the disadvantage that the shoulder is adjustable depending on the length and adjusted to the dimension of the tube blank to be rolled, i.e. H. must be interchangeable.

Ein besonderes Problem beim Anwalzen der Rohrluppen entsteht dann, wenn besonders kurze Rohrluppen zum Einsatz gebracht werden, weil die Einführvorrichtungen hinsichtlich ihres Hubes nicht ausreichen, um den Anfang der Rohrluppe sicher in die Walzen des Asselwalzwerkes einzuschieben. Dies ist insbesondere dann problematisch, wenn das Einschieben durch die bekannte Vorreduktionseinrichtung erfolgen muß, die verfahrensbedingt einen bestimmten Abstand vom Asselwalzwerk einnimmt.A particular problem with the rolling of the tube blanks arises when particularly short tube blanks are used because the insertion devices are not sufficient in terms of their stroke to securely insert the beginning of the tube blank into the rollers of the woodleader mill. This is particularly problematic when the insertion has to be carried out by the known pre-reduction device which, due to the method, is at a certain distance from the wood mill.

Aus der JP-A-57-190 708 ist eine Vorrichtung zum Reduzieren der Wanddicke von Rohrenden bekannt, die unabhängig vom nachgeordneten Walzwerk wirkt.From JP-A-57-190 708 a device for reducing the wall thickness of pipe ends is known, which acts independently of the downstream rolling mill.

Es ist das Ziel der vorliegenden Erfindung, ein Asselwalzwerk mit Vorreduktionseinrichtung so einzusetzen bzw. auszugestalten, daß das Anwalzen insbesondere kurzer Rohrluppen mit einfachen Mitteln und sicher möglich ist, ohne daß die vorstehend zum Stand der Technik beschriebenen Nachteile wie Verdrallen der Rohrluppe oder Austauschen von Vorrichtungselementen weger unterschiedlicher Abmessungen erforderlich wird.It is the object of the present invention to use or to design an Assel rolling mill with a pre-reduction device in such a way that rolling on, in particular, short tube groups is possible with simple means and without the disadvantages described above in relation to the prior art, such as twisting of the tube group or replacement of device elements because of different dimensions is required.

Zur Lösung der Aufgabe wird in Verbindung mit den Merkmalen im Oberbegriff des Patentanspruches 1 erfindungsgemäß vorgeschlagen, daß zum Anwalzen kurzer Rohrluppen diese durch Verschieben der Vorreduktionseinrichtung mit den die Rohrluppe klemmenden Walzen in das Asselwalzwerk eingeführt werden und beim Anwalzen im Asselwalzwerk auch die Walzen der Vorreduktionseinrichtung lünettenartig drehgeführt werden.
Mit anderen Worten, die vorhandene Vorreduktionseinrichtung wird zu dem Zweck eingesetzt, die kurze Rohrluppe zum Anwalzen zwischen Asselwalzen zu schieben, um dann die Luppenführung wie eine Lünette zu übernehmen und um schließlich am Rohrluppenende mit Hilfe der zentrisch zu fahrenden Walzen der Einrichtung in der bekannten Weise die Rohrluppenwandstärke zur Vermeidung der Triangulation zu reduzieren. Die Vorreduktionseinrichtung wird also neben ihrem eigentlichen Zweck universell auch zum Anwalzen der Rohrluppe sowie zum Führen zur Vermeidung des Verdrallens benutzt.To solve the problem it is proposed according to the invention in connection with the features in the preamble of patent claim 1 that for rolling on short tube blanks these are inserted into the woodworking mill by moving the pre-reduction device with the rollers clamping the tube blank, and when rolling in the woodworking mill the rollers of the pre-reduction device are also bezel-like be turned.
In other words, the existing pre-reduction device is used for the purpose of pushing the short tube blank for rolling between woodleaf rollers, then taking over the tube guidance like a steady rest and finally at the tube end end with the aid of the rollers of the device to be driven centrically in the known manner reduce the tube blank wall thickness to avoid triangulation. In addition to its actual purpose, the pre-reduction device is therefore also used universally for rolling on the tube blank and for guiding to avoid twisting.

In einer Ausgestaltung der Erfindung ist vorgesehen, drei gleichmäßig um die Rohrluppe verteilt angeordnete Walzen zu verwenden, die mittels radial zur Rohrluppenmitte wirkender Kolben-Zylinder-Einheiten gegen die Rohrluppe anstellbar sind. Damit läßt sich mit entsprechendem Gleichlauf der Kolben-Zylinder-Einheiten sicher zu klemmen und andererseits auch zum Vermindern des Luppenendes zu reduzieren.In one embodiment of the invention, it is provided to use three rolls which are evenly distributed around the tube blank and which can be adjusted against the tube blank by means of piston-cylinder units acting radially to the tube center. This allows the piston-cylinder units to be clamped securely with a corresponding synchronism and, on the other hand, to reduce the end of the slug.

Vorzugsweise sind die Walzen in einem Gerüstkörper frei drehbar gelagert, der gegenüber dem Rahmen der Vorreduktionseinrichtung in Gleitführungen mittels parallel zur Rohrluppenlängsachse angeordneter Kolben-Zylinder-Einheiten längsverschiebbar ist. Einfache Gleitführungen beidseitig des Gerüstkörpers ermöglichen eine sichere Gleitführung des Gerüstkörpers,um den erforderlichen Hub von etwa 200 mm.The rollers are preferably freely rotatably mounted in a stand body, which is longitudinally displaceable with respect to the frame of the pre-reduction device in slide guides by means of piston-cylinder units arranged parallel to the longitudinal axis of the tube blank. Simple sliding guides on both sides of the scaffold body enable the scaffold body to be guided securely by the required stroke of approximately 200 mm.

Vorzugsweise ist der Gerüstkörper in dem Rahmen federnd abgestützt, um geringe Auslenkungen infolge Ungleichmäßigkeiten über der Rohrluppenlängsrichtung ausgleichen zu können.The scaffold body is preferably resiliently supported in the frame in order to be able to compensate for slight deflections as a result of irregularities over the longitudinal direction of the tube blank.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:

Fig. 1
eine Seitenansicht der erfindungsgemäßen Vorreduktionseinrichtung und
Fig. 2
eine Ansicht in Rohrluppenlängsrichtung.
An embodiment of the invention is shown in the drawing and is described below. It shows:
Fig. 1
a side view of the pre-reduction device according to the invention and
Fig. 2
a view in the pipe longitudinal direction.

Wie in Figur 1 erkennbar, liegt eine kurze Rohrluppe 4 vor der Anschlagvorderkante 1. In dieser Stellung wird die dimensionsabhängige Dornstange,die bei 2 erkennbar, eingestoßen. Alsdann führt der Transportrollgang 3 die Einheit aus Rohrluppe 4 und Dornstange 2 in das bei 5 angedeutete Asselwalzwerk. Befindet sich die Rohrluppe 4 im Bereich der Asselwalzen, fahren die Walzen 7 der Vorreduktionseinrichtung 6 zentrisch zusammen und klemmen den Außendurchmesser der Rohrluppe 4 betätigt durch wegabhängig gesteuerte hydraulische Zylinder. Nach Klemmung der Rohrluppe 4 fahren die beiden seitlich angeordneten hydraulischen Kolben-Zylinder-Einheiten 8 die gesamte Vorreduktionseinrichtung 6 zusammen mit der Rohrluppe 4 um einen Hub von ca. 200 mm in Richtung Asselwalzwerk 5 und schieben dabei die Rohrluppe 4 zum Anwalzen zwischen die Walzen des Asselwalzwerkes 5. Beim Anwalzen wird die Rohrluppe 4 in Drehung versetzt, wobei sie sich gleichzeitig in den Walzen 7 der Vorreduktionseinrichtung 6 dreht, die damit - ähnlich wie eine Lünette - die Lupperführung übernehmen.As can be seen in FIG. 1, a short tube blank 4 lies in front of the front edge 1. In this position, the dimension-dependent mandrel bar, which can be seen at 2, is pushed in. Then the transport roller table 3 leads the unit consisting of tube blank 4 and mandrel bar 2 into the woodworking mill indicated at 5. If the tube blank 4 is located in the area of the woodlice rollers, the rollers 7 of the pre-reduction device 6 move together centrally and clamp the outer diameter of the tube blank 4, actuated by hydraulic cylinders which are controlled as a function of the path. After clamping the tube blank 4, the two hydraulic piston-cylinder units 8 arranged on the side move the entire pre-reduction device 6 together with the tube blank 4 by one stroke Approx. 200 mm in the direction of Asselwalzwerk 5 and thereby push the tube blank 4 for rolling between the rollers of the Asselwalzwerkes 5. When rolling the tube blank 4 is set in rotation, while it rotates in the rollers 7 of the pre-reduction device 6, which - similarly like a bezel - take the lead.

Ein Infrarot-Auge erfaßt das Luppenende und steuert in bekannter Weise wegabhängig die Kolben-Zylinder-Einheiten zum Anstellen der Walzen der Vorreduktionseinrichtung 6 auf einen eingestellten Wert. Damit wird von einem bestimmten Zeitpunkt an das Rohrluppenende soweit reduziert, daß die in der DE 38 23 135 C 2 beschriebene Triangulation der Rohrluppe 4 und daraus resultierende Stecker zwischen den Asselwalzen verhindert wird.An infrared eye detects the end of the slug and controls the piston-cylinder units for adjusting the rollers of the pre-reduction device 6 to a set value in a known manner. From a certain point in time, the end of the tube blank is reduced to such an extent that the triangulation of the tube blank 4 described in DE 38 23 135 C 2 and the resulting connector between the woodleaf rollers is prevented.

Sobald die Rohrluppe 4 ausgewalzt ist, werden die Walzen 7 der Vorreduktionseinrichtung 6 geöffnet und die seitlichen Kolben-Zylinder-Einheiten 8 fahren die Vorreduktionseinrichtung in die Ausgangsstellung für einen neuen Arbeitszyklus zurück.As soon as the tube blank 4 is rolled out, the rollers 7 of the pre-reduction device 6 are opened and the lateral piston-cylinder units 8 move the pre-reduction device back into the starting position for a new working cycle.

Werden längere Rohrluppen verwalzt, bei denen ein Verschieben der Vorreduktionseinrichtung 6 in erfindungsgemäßer Weise nicht erforderlich ist, so kann die Vorreduktionseinrichtung 6 neben ihrem eigentlichen Zweck als Lünette, d.h. zur Rohrluppenführung verwendet werden.If longer tube blanks are rolled in which it is not necessary to move the pre-reduction device 6 in the manner according to the invention, the pre-reduction device 6 can be used in addition to its actual purpose as a steady rest, i.e. can be used to guide pipe sections.

Claims (4)

  1. Process for guiding pipe, puddled iron (4) and for reducing, by means of a reducing-device (6), its end before it runs into a rolling-mill (5), which is disposed immediately afterwards in relation to this and which comprises several rollers (7), disposed uniformly around pipe, puddled iron (4), which can be disposed centrally against pipe, puddled iron (4), a movement of application concerned being controlled based on a recorded position of pipe, puddled iron concerned,
    characterized in that
    to roll short pipe, puddled iron (4), this latter is directed into a rolling mill (5), by pushing of a pipe-reducing device (6) with rollers (7) gripping pipe, puddled iron (4) concerned, and in that, during rolling in a rolling mill (5) by rollers (7), a prereducing device (6) is guided in a rotating steady-type movement.
  2. Process in accordance with claim 1,
    a prereducing device (6) has three rollers (7) distributed uniformly around pipe, puddled iron (4), it being possible for said rollers to be set against pipe, puddled iron concerned by means of piston-cylinder units (8) acting radially in relation to a centre of pipe, puddled iron.
  3. Process in accordance with claim 2,
    characterizedin that
    rollers (7) are carried in a support-frame such that they can rotate freely, a said support frame (9) being able to move in a lengthwise direction, in relation to a frame of a prereducing device (6), in guideways (10), by means of piston-cylinder units (8) disposed parallel to a lengthwise axis of pipe, puddled iron.
  4. Process in accordance with claim 3,
    characterized in that
    a support-frame (9) has sprung support in a frame (11).
EP93250337A 1992-12-11 1993-12-07 Method of guiding a rough-pierced tube blank Expired - Lifetime EP0601680B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242423 1992-12-11
DE4242423A DE4242423C1 (en) 1992-12-11 1992-12-11 Pre-reduction device

Publications (2)

Publication Number Publication Date
EP0601680A1 EP0601680A1 (en) 1994-06-15
EP0601680B1 true EP0601680B1 (en) 1996-04-10

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Application Number Title Priority Date Filing Date
EP93250337A Expired - Lifetime EP0601680B1 (en) 1992-12-11 1993-12-07 Method of guiding a rough-pierced tube blank

Country Status (4)

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US (1) US5440911A (en)
EP (1) EP0601680B1 (en)
JP (1) JP3361375B2 (en)
DE (2) DE4242423C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989773A (en) * 2012-12-18 2013-03-27 中国二冶集团有限公司 Construction method for improving centring accuracy of racks of steel tube perforating machines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431410C1 (en) * 1994-08-24 1995-11-16 Mannesmann Ag Method for rolling hollow block on roller mechanism
KR100419864B1 (en) * 2001-11-15 2004-03-04 한국화학연구원 New Cross-linker, and Cross-linkable Solid polymer Electrolytes using the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU486820A1 (en) * 1974-05-17 1975-10-05 Уральский научно-исследовательский институт трубной промышленности Device for preparing the end of the workpiece before rolling
JPS5772708A (en) * 1980-10-24 1982-05-07 Nippon Kokan Kk <Nkk> Front and back roller guide for skew rolling mill
JPS57190708A (en) * 1981-05-18 1982-11-24 Kawasaki Steel Corp Rolling device for reducing wall thickness of pipe end of seamless steel pipe
DE3823135C3 (en) * 1988-07-05 1995-05-04 Mannesmann Ag Method and arrangement to reduce the outer diameter and the wall thickness of a mainly cylindrical hollow tube blank by rolling
JPH05309407A (en) * 1992-05-08 1993-11-22 Nippon Steel Corp Pusher for shaft material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989773A (en) * 2012-12-18 2013-03-27 中国二冶集团有限公司 Construction method for improving centring accuracy of racks of steel tube perforating machines
CN102989773B (en) * 2012-12-18 2015-03-25 中国二冶集团有限公司 Construction method for improving centring accuracy of racks of steel tube perforating machines

Also Published As

Publication number Publication date
US5440911A (en) 1995-08-15
EP0601680A1 (en) 1994-06-15
JPH06218407A (en) 1994-08-09
DE59302191D1 (en) 1996-05-15
DE4242423C1 (en) 1994-01-05
JP3361375B2 (en) 2003-01-07

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