DE2929401A1 - Hot piercing of ingots for tube mfr. - esp copper ingots, which are heated and rolled over mandrel in skew mill in protective atmos. of nitrogen to preclude oxidn. of ingots - Google Patents
Hot piercing of ingots for tube mfr. - esp copper ingots, which are heated and rolled over mandrel in skew mill in protective atmos. of nitrogen to preclude oxidn. of ingotsInfo
- Publication number
- DE2929401A1 DE2929401A1 DE19792929401 DE2929401A DE2929401A1 DE 2929401 A1 DE2929401 A1 DE 2929401A1 DE 19792929401 DE19792929401 DE 19792929401 DE 2929401 A DE2929401 A DE 2929401A DE 2929401 A1 DE2929401 A1 DE 2929401A1
- Authority
- DE
- Germany
- Prior art keywords
- ingots
- oxidn
- rolling
- rolled
- heated
- 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.)
- Withdrawn
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 10
- 229910052802 copper Inorganic materials 0.000 title claims description 10
- 239000010949 copper Substances 0.000 title claims description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
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
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/005—Copper or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
- B21B2045/006—Heating the product in vacuum or in inert atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/023—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes by immersion in a bath
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
und einem in Durchlaufrichtung gesehen dahinter angeordneten Warmschräzwalzwerk, dadurch gejennzeichnet, daß in dem Glühofen (3) eine Schutzgasatmosphäre vorhanden ist und an die Austrittsöffnung (13) für die Metallblöcke (2) ein mit Schutzgas gefulltes Rohr (14, 15) angeschlossen ist, welches sich bis in den Walzspalt erstreckt. and a hot-cut mill located behind it, viewed in the direction of passage, characterized in that a protective gas atmosphere is present in the annealing furnace (3) is and to the outlet opening (13) for the metal blocks (2) with a protective gas filled pipe (14, 15) is connected, which extends into the roll gap.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Rohr (14, 15) im Bereich unmittelbar vor dem Walzspalt durch mehrere frei drehbar gelagerte oder angetriebene Büchsen (15) gebildet ist, deren Innendurchmesser geringfügig größer als der Außendurchmesser des zu walzenden Metallblockes (2) ist und der mit den Büchsen (15) bestückte Bereich des Rohres (14, 15) mindestens gleich der Länge des zu walzenden Blockes (2) ist.5. Apparatus according to claim 4, characterized in that the tube (14, 15) in the area immediately in front of the roll gap by several freely rotatable or driven bushes (15) is formed, the inner diameter of which is slightly is larger than the outer diameter of the metal block (2) to be rolled and that with the sleeve (15) equipped area of the tube (14, 15) at least equal to the length of the block to be rolled (2).
(,. Vorrichtung naci, Anspruch 5, dadurch gekennzeichnet, daß benachbarte Büchsen (15) an ihren Enden gasdicht miteinander verbunden sind.(,. Device naci, claim 5, characterized in that adjacent Bushings (15) are connected to one another in a gas-tight manner at their ends.
7. Vorrichtung nach Anspruch 5 oder G, dadurch sekennzeichnetX daß jede Büchse (15) in einem Gehäuse (16) lilittels zweier in axialem Abstand zueinander angeordneter Kugellager (20, 21) gelagert ist.7. Apparatus according to claim 5 or G, characterized in that X each sleeve (15) in a housing (16) by means of two axially spaced apart arranged ball bearing (20, 21) is mounted.
8. Vorrichtung nach Anspruch 5 oder einem der folgenden, dadurch gekennzeichnet, daß jede Büchse (15) mit dem Gehäuse (16) zwischen den Kugellagern (20, 21) einen Ringraum (25) bildet, dem durch im Gehäuse (10) vorgesehene Offnungen (22, 23) ein Kühlmedium zugeführt ist.8. Apparatus according to claim 5 or one of the following, characterized in that that each sleeve (15) with the housing (16) between the ball bearings (20, 21) one Annular space (25) forms, which through openings (22, 23) provided in the housing (10) Cooling medium is supplied.
Verfahren zum Walzen von in der Wärme zur Oxidation neigenden Metallblöcken zu Rohren Die Erfindung betrifft ein Verfahren zum Walzen von iii der Wärme zur Oxidation neigenden Metallblöcken zu Rohren, beispielsweise Kupferblöcken, welche in einem Glühofen auf Walztemperatur erwärmt, einem Walzwerk zugeführt und dort mittels eines feststehenden Dornes und mehrerer schräggestellter angetriebener Walzen gelocht und gestreckt werden.Process for rolling metal blocks which tend to oxidize when exposed to heat to tubes The invention relates to a method for rolling iii the heat to Oxidation-prone metal blocks to tubes, for example copper blocks, which heated to rolling temperature in an annealing furnace, fed to a rolling mill and there by means of a fixed mandrel and several inclined driven rollers be punched and stretched.
Zur Herstellung nahtloser metallischer Rohre ist es bekannt, Rohrwalzwerke zu verwenden, in denen Blöcke in rotglühendem Zustand zwischen zwei oder drei Arbeitswalzen über einen Dorn verformt werden. Es hat sicfi gezeigt, daß sich beim Glühen und bein Transport des Walzknüppels in den Walzspalt dieser mit einer Oxidschicht überzieht, die beim Walzen in die Oberfläche eingewalzt wird, sofern man diese nicht vorher entfernt.For the production of seamless metallic tubes, it is known to use tube rolling mills to use in which blocks in red-hot state between two or three work rolls be deformed via a mandrel. It has been shown that when glowing and When the billet is transported into the roll gap, it is covered with an oxide layer, which is rolled into the surface during rolling, provided that this has not been done beforehand removed.
Bei einem bekannten Verfahren (DE-OS 25 05 769) wird der Metallblock unmittelbar vor dem Eintritt in den Walzspalt mittels Wasserstrahlen entzundert. Diese Vorgehensweise ist recht unsicher, da nicht gewährleistet werden kann, daß sämtlicher Zunder von der Oberfläche des Walzblocks abgestrahlt wird. Darüberhinaus ist dieses Verfahren unwirtschaftlich, da der Wasserverbrauch sehr hoch ist.In a known method (DE-OS 25 05 769) the metal block Descaled by means of water jets immediately before entering the roll gap. This approach is quite uncertain as it cannot be guaranteed that all of the scale is blasted from the surface of the billet. Furthermore this process is uneconomical because the water consumption is very high.
Der Erfindung liegt von daher die Aufgabe zugrunde, ein Verfahren der eingangs erwähnten Art anzugeben, bei dem walzblöcke mit metallisch blanker Oberfläche in den Walzspalt gelangen und somit Rohre gewalzt werden können, die frei von eingewalzten Oxiden sind.The invention is therefore based on the object of a method of the type mentioned at the beginning, in which the billets are covered with bright metal Surface get into the roll gap and thus tubes can be rolled that are free of rolled-in oxides.
Diese Aufgabe wird dadurch gelöst, daß gemäß der Erfindung die einzelnen Metallblöcke in einer Schutzgasatmosphäre geslüht und dem Walzwerk in einer Schutzgasatmosphäre zugeführt werden. Durch das Glühen unter Schutzgas gelangen Walzblöcke aus dciii Ofen, die vo'lli trei von Oxiden sind. Die Schutzgasatmosphäre während des Transportweges zum Walzspalt sorgt dafür, daß metallisch blanke Metallblöcke in den Walzvorgang gelangen. Nach einem weiteren Gedanken der Erfindung wird im Waltzspalt selbst auch eine Schutzgasatmosphäre aufrechterhalten. Das aus dem Waltzspalt austretende Metallrohr wird, wie an sich bekannt, direkt in Wasser gewalzt, so daß das gewalzte Rohr sich ebenfalls nicht mit Oxiden überziehen kann. Als Sciiutzgyas hat sich Stickstoif als zweckmäßig erwiesen. Jedoch können auch Edelgase, wie Argon, verwender werden.This object is achieved in that, according to the invention, the individual Metal blocks annealed in a protective gas atmosphere and the rolling mill in a protective gas atmosphere are fed. By annealing under protective gas, rolling blocks come from dciii Furnaces that are vo'lli free of oxides. The protective gas atmosphere during the transport route to the roll gap ensures that bare metal blocks are used in the rolling process reach. According to a further idea of the invention, in the rolling gap itself is also maintain a protective gas atmosphere. The metal pipe emerging from the rolling gap is, as is known per se, rolled directly in water, so that the rolled tube is cannot be coated with oxides either. As Sciiutzgyas, Stickstoif Proven to be useful. However, noble gases such as argon can also be used.
Die Erfindung betrifft weiterhin eine Vorrichtung zur Durchführung des Verfahrens, welche aus einem Glüllofen und einem in Durchlaufrichtung gesehen dahinter angeordneten Warmschrägwalzwerk besteht. Diese bekannte Vorrichtung wird dahingehend verbessert, daß in deui Glühofen eine Schutzgasatnio sphäre vorhanden ist und an die Austrittsöffnung für die Metallblöcke ein mit Schutzgas gefülltes Rohr angeschlossen ist, welches sich bis in den Walzspalt erstreckt.The invention also relates to a device for implementation of the process, which consists of an annealing furnace and one in the direction of passage behind it, there is a hot piercing mill. This known device is improved to the effect that a protective gas atmosphere is available in the annealing furnace is and to the outlet opening for the metal blocks with inert gas filled pipe is connected, which extends into the roll gap.
Wird in dem Glühofen ein geringer Überdruck an Schutzgas aufrecht erhalten, so strömt dieses durch die Austrit tsöffnung in das Rohr und tritt an dessen Ende, welches möglichst nahe am Walzspalt endet, aus diesem aus. Dadurch ist gewährleistet, daß auch der Walzvorgang selbst unter Schutzgas durchgeführt wird. Nach einer besonders günstigen Ausgestaltung der Erfindung ist das Rohr im Bereich unmittelbar vor dem Walzspalt durch mehrere drei drehbar gelagerte oder angetriebene Büchsen gebildet, deren innendurchmesser geringfügig größer als der Außendurchmesser des zu walzenden Metallblockes ist und daß der mit den Büchsen bestückte Bereich des Rohres mindestend gleich der Länge des zu walzenden Blockes ist. Die Schrägstellung der Walzen bewirkt, daß sowohl der Metallblock als auch das mit diesem verbundene bereits gewalzte Rohr in Rotationsobewegung versetzt wird. Die frei drehbaren bzw. angetriebenen Büchsen verringern die Reibung zwischen dem Metallblock und der Einlaufstrecke, so daß Beschädigungen des Walzblockes vermieden sind. Um den Austritt von Schutzgas möglichst einzuschränken, sind benachbarte Büchsen an ihren Eiiden gasdicht miteinander verbunden. Es hat sich als vorteilhaft erwiesen, jede Büchse in einem Gehäuse mittels zweier in axialem Abstand zueinander angeordneter Kugellager zu lagern. Weiterhin ist vorgesehen, daß jede Büchse mit dem Gehäuse zwischen den Kugellagern einen Ringraum bildet, dem durch im Gehäuse vorgesehene Öffnungen ein Kühlmedium zugeführt ist. Dadurch wird vermieden, daß die Kugellager durch die durch die Metaliblöcke zugeführte Wärme überhitzt und damit beschädigt werden.If a slight overpressure of protective gas is maintained in the annealing furnace received, it flows through the outlet opening into the pipe and occurs its end, which ends as close as possible to the roll gap, from this. Through this it is guaranteed that the rolling process itself is carried out under protective gas will. According to a particularly advantageous embodiment of the invention, the tube is in Area immediately in front of the roll gap by several three rotatably mounted or Driven bushings formed whose inner diameter is slightly larger than the Outside diameter of the metal block to be rolled and that with the sleeves equipped area of the pipe at least equal to the length of the block to be rolled is. The inclination of the rollers causes both the metal block and the already rolled pipe connected to this is set in rotation. The freely rotatable or driven bushings reduce the friction between the Metal block and the inlet section, so that damage to the rolling block is avoided are. In order to limit the escape of protective gas as much as possible, adjacent bushings are required connected to one another in a gastight manner at their eggs. It has been shown to be beneficial each sleeve in a housing by means of two axially spaced apart Bearing ball bearings. It is also provided that each sleeve with the housing Forms an annular space between the ball bearings, which is provided by the housing A cooling medium is supplied to openings. This avoids that the ball bearings overheated and damaged by the heat supplied by the metal blocks will.
Die Erfindung ist anhand des in den Fig. 1 und 2 schematisch dargestellten Ausführungsbeispiels näher erläutert.The invention is shown schematically with reference to FIGS. 1 and 2 Embodiment explained in more detail.
Uber einen Fördergang 1 werden Kupferblöcke 2 einem Glühofen 3 zugeführt. Die aus dcii Glühofen 3 austretendeii erwärmten Kupferblöcke 2 werden dem Warmschrägwalzwerk 4 zugeführt und in diesem mittels der schräggestellten Walzen 5 uiid (J und eines an einer Dornstange 7 befestigten in den Walzspalt eingreifenden nicht dargestellten Dorn zu Kupferrohren 8 gewalzt.Copper blocks 2 are fed to an annealing furnace 3 via a conveyor aisle 1. The copper blocks 2 exiting from the annealing furnace 3 are heated to the hot piercing mill 4 and in this by means of the inclined rollers 5 uiid (J and one attached to a mandrel bar 7 engaging in the roll gap, not shown Mandrel rolled into 8 copper tubes.
Die aus dem Walzspalt austretenden Kupferrohre 8 gelangen direkt in einen mit Wasser gefüllten Behälter 9.The copper pipes 8 emerging from the roll gap go directly into a container 9 filled with water.
Das Walzwerk 4 besteht aus einem Antrieb 10, welcher über Spindeln 11 und 12 den walzen 5 und b eine Drehbewegung erteilt. Durch die Schrägstellung der Walzen 5 und ö wird dem Block 2 sowie dem Rohr 8 sowohl eine Vorschubbewegung als auch eine Rotationsbewegung erteilt.The rolling mill 4 consists of a drive 10 which is driven by spindles 11 and 12 the rollers 5 and b are given a rotary motion. Due to the inclination of the rollers 5 and 6, the block 2 and the pipe 8 both have a feed movement as well as a rotational movement.
Erfindungsgemäß arbeitet der Glühofen 3 unter Schutzgas und werden die geglühten Kupferblöcke 2 dem Walzspalt ebenfalls in einer Schutzgasatmösphäre zugeführt. Diese Schutzgasatmosphäre wird dadurch erzeugt, daß an die Austrittsüffnung 13 des Glühofens 3 eine Rohr 14 angeschlossen ist, in dessen Innenraum das in dem Glühofen 3 befindliche Schutzgas,zweckmäßigerweise Stickstoff, einströmen kann.According to the invention, the annealing furnace 3 works under protective gas and are the annealed copper blocks 2 the roll gap also in a protective gas atmosphere fed. This protective gas atmosphere is generated by the fact that the outlet opening 13 of the annealing furnace 3, a tube 14 is connected, in the interior of which in the Annealing furnace 3 located inert gas, expediently nitrogen, can flow in.
Um eiiie Beschädigung der Oberfläche der zu walzenden Kupferblöcke 2 möglichst einzuschränken, ist der Bereich des Rohres 14 unmittelbar vor dem Walzspalt durch mehrere aneinandergereihte angetriebene Büchsen 15 gebildet. Die Büchsen 15 sind gasdicht miteinander verbunden. Durch einen leichten Überdruck des Schutzgases im Glühofen 3 strömt eine geringe Menge Schutzgas durch das Rohr 14 und die Büchsen 15 bis in den Bereich der schrägwalzen 5 und 6, so daß auch ein Walzen unter Schutzgasatmosphäre möglicht ist. Durch die erfindungsgemäßen Maßnahmen is erreicht, daß hupferrohre erzeugt werden können, die völlig frei von eingewalzten und auch nach de Walzen entstandenen Oxiden sind.To avoid damaging the surface of the copper blocks to be rolled 2 as possible, is the area of the pipe 14 immediately in front of the roll gap formed by several driven bushings 15 lined up in a row. The cans 15 are connected to one another in a gastight manner. By a slight overpressure of the protective gas In the annealing furnace 3, a small amount of protective gas flows through the tube 14 and the cans 15 to the area of the inclined rollers 5 and 6, so that rolling in a protective gas atmosphere is possible. By the measures according to the invention is achieved that copper pipes can be generated that are completely free from rolled and also after de rolling resulting oxides are.
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792929401 DE2929401A1 (en) | 1979-07-20 | 1979-07-20 | Hot piercing of ingots for tube mfr. - esp copper ingots, which are heated and rolled over mandrel in skew mill in protective atmos. of nitrogen to preclude oxidn. of ingots |
| IT49156/80A IT1146057B (en) | 1979-07-20 | 1980-07-03 | PROCESS AND APPARATUS FOR THE LAMINATION OF METAL BLOCKS SUBJECT TO HOT OXIDATION TO OBTAIN PIPES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792929401 DE2929401A1 (en) | 1979-07-20 | 1979-07-20 | Hot piercing of ingots for tube mfr. - esp copper ingots, which are heated and rolled over mandrel in skew mill in protective atmos. of nitrogen to preclude oxidn. of ingots |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2929401A1 true DE2929401A1 (en) | 1981-02-05 |
Family
ID=6076272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19792929401 Withdrawn DE2929401A1 (en) | 1979-07-20 | 1979-07-20 | Hot piercing of ingots for tube mfr. - esp copper ingots, which are heated and rolled over mandrel in skew mill in protective atmos. of nitrogen to preclude oxidn. of ingots |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2929401A1 (en) |
| IT (1) | IT1146057B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2569582A1 (en) * | 1984-09-01 | 1986-03-07 | Kocks Technik | PROCESS AND INSTALLATION FOR MANUFACTURING SOLDER FREE TUBES |
| EP0426935A2 (en) * | 1989-11-10 | 1991-05-15 | Sumitomo Heavy Industries, Ltd | Process for hot working article defining hole at the center thereof |
| WO2002049781A1 (en) * | 2000-12-20 | 2002-06-27 | Outokumpu Oyj | Method and apparatus for manufacturing tubes |
| WO2002055226A1 (en) * | 2000-12-20 | 2002-07-18 | Outokumpu Oyj | Method and apparatus for manufacturing tubes by rolling |
| EP1232808A2 (en) * | 2001-02-17 | 2002-08-21 | SMS Meer GmbH | Method for cold rolling seamless copper pipes |
| DE19936010B4 (en) * | 1999-08-04 | 2009-04-30 | Sms Demag Ag | Process and apparatus for suppressing scale formation, in particular secondary scale during hot rolling of slabs |
| US8479550B2 (en) | 2005-11-09 | 2013-07-09 | Siemens Vai Metals Technologies Gmbh | Method for the production of hot-rolled steel strip and combined casting and rolling plant for carrying out the method |
-
1979
- 1979-07-20 DE DE19792929401 patent/DE2929401A1/en not_active Withdrawn
-
1980
- 1980-07-03 IT IT49156/80A patent/IT1146057B/en active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2569582A1 (en) * | 1984-09-01 | 1986-03-07 | Kocks Technik | PROCESS AND INSTALLATION FOR MANUFACTURING SOLDER FREE TUBES |
| US4928507A (en) * | 1984-09-01 | 1990-05-29 | Kocks Technik Gmbh & Co. | Methods and apparatus for manufacturing seamless tube |
| EP0426935A2 (en) * | 1989-11-10 | 1991-05-15 | Sumitomo Heavy Industries, Ltd | Process for hot working article defining hole at the center thereof |
| EP0426935A3 (en) * | 1989-11-10 | 1991-06-26 | Sumitomo Heavy Industries, Ltd | Process for hot working article defining hole at the center thereof |
| DE19936010B4 (en) * | 1999-08-04 | 2009-04-30 | Sms Demag Ag | Process and apparatus for suppressing scale formation, in particular secondary scale during hot rolling of slabs |
| US6920773B2 (en) * | 2000-12-20 | 2005-07-26 | Outokumpu Oyj | Method and apparatus for manufacturing tubes by rolling |
| US6892559B2 (en) * | 2000-12-20 | 2005-05-17 | Outokumpu Oyj | Method and apparatus for manufacturing tubes |
| WO2002055226A1 (en) * | 2000-12-20 | 2002-07-18 | Outokumpu Oyj | Method and apparatus for manufacturing tubes by rolling |
| WO2002049781A1 (en) * | 2000-12-20 | 2002-06-27 | Outokumpu Oyj | Method and apparatus for manufacturing tubes |
| CN100488650C (en) * | 2000-12-20 | 2009-05-20 | 奥托库姆普联合股份公司 | Method and apparatus for manufacturing tubes |
| CN1492788B (en) * | 2000-12-20 | 2011-11-09 | 奥托库姆普联合股份公司 | Method and apparatus for manufacturing tubes by rolling |
| EP1232808A2 (en) * | 2001-02-17 | 2002-08-21 | SMS Meer GmbH | Method for cold rolling seamless copper pipes |
| EP1232808A3 (en) * | 2001-02-17 | 2004-09-29 | SMS Meer GmbH | Method for cold rolling seamless copper pipes |
| US8479550B2 (en) | 2005-11-09 | 2013-07-09 | Siemens Vai Metals Technologies Gmbh | Method for the production of hot-rolled steel strip and combined casting and rolling plant for carrying out the method |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1146057B (en) | 1986-11-12 |
| IT8049156A0 (en) | 1980-07-03 |
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