EP0644272A2 - Procédé de fabrication de tubes en cuivre ou en alliages de cuivre - Google Patents

Procédé de fabrication de tubes en cuivre ou en alliages de cuivre Download PDF

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Publication number
EP0644272A2
EP0644272A2 EP94250225A EP94250225A EP0644272A2 EP 0644272 A2 EP0644272 A2 EP 0644272A2 EP 94250225 A EP94250225 A EP 94250225A EP 94250225 A EP94250225 A EP 94250225A EP 0644272 A2 EP0644272 A2 EP 0644272A2
Authority
EP
European Patent Office
Prior art keywords
tube
copper
speed
cold
rolling
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Withdrawn
Application number
EP94250225A
Other languages
German (de)
English (en)
Other versions
EP0644272A3 (fr
Inventor
Karl-Heinz Häusler
Horst Stinnertz
Wilfried Dipl.-Ing. Schrey
Peter Dipl.-Ing. Kalkenings
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
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 EP0644272A2 publication Critical patent/EP0644272A2/fr
Publication of EP0644272A3 publication Critical patent/EP0644272A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/005—Pilgrim-step tube-rolling, i.e. pilger mills with reciprocating stand, e.g. driving the stand
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • 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
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • 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
    • B21B3/003—Rolling non-ferrous metals immediately subsequent to continuous casting, i.e. in-line rolling
    • 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
    • B21B39/006—Pinch roll sets

Definitions

  • the invention relates to a method and a plant for the production of pipes made of copper or copper alloys by cold pilger rolling a hollow body in a rolling mill with a reciprocating roll stand with positively driven calibrated rolls located therein with batch feed and / or rotation of the pipe in the region of one or both dead centers , in which the cyclically uneven feed / exit speed of the rolled tube is converted into a constant outlet speed in a buffer zone and the tube is held in a constant speed driving device against torsion.
  • a method and a plant for producing copper pipes of the type described in the introduction is described in DE 31 46 284 C2.
  • the aim of the known method is to roll pipes of great lengths on a generic plant.
  • large pipe lengths because the use of large block weights increases the economic viability of the process.
  • Large block weights also mean tube lengths behind the cold pilger rolling mill of up to 250 meters.
  • the known patent solves the problem that arises from the fact that when pipes are cold crawled, cyclically very different speeds arise at the outlet of the rolling mill in that these cyclical speeds are compensated for and the torsion of the pipe rotated during the vocational rolling process remains below the flow limit, even though the pipe is held. This means that large pipe lengths can also be handled, for example by coiling.
  • the known method can be used without problems for extruded or diagonally rolled blanks which have a fine-grained structure as a result of the hot shaping carried out during pressing or rolling and subsequent quenching.
  • the production of copper pipes from obliquely rolled, but in particular from extruded, blanks is expensive and complex.
  • the energy required to warm up the block is considerable, the weight of the blocks is limited by the size of the extrusion presses. If extrusion presses with higher press forces or block weights are used, they become disproportionately expensive.
  • extruded materials for example extruded hollow bodies, instead of extruded or obliquely rolled blocks, which means that the block heating and pressing and thus the use of the extrusion press are not required.
  • the use of continuously cast hollow bodies has the disadvantage that the continuous casting cross section has a coarse-grained cast structure, which is only after a first cold forming of the hollow body and by subsequent Recrystallization annealing can be converted into a fine-grained structure. Missing or inadequate recrystallization inevitably leads to errors in cold processing by pulling or the like.
  • the annealing temperature and annealing time for recrystallizing the structure must be in a certain relationship to one another if one wants to achieve a uniformly fine-grained structure with the smallest possible grains.
  • the front pipes produced in this way have an irregularly recrystallized structure with small and large grains and remnants of the cast structure. It is known to the person skilled in the art that the achievable stretching is determined by the grain size in a subsequent cold further processing. A larger grain limits the stretchability, which is very important when manufacturing very small and thin-walled heat exchanger tubes, e.g. of dimensions 7 ⁇ 0.28 mm can cause tears when pulling. The reason for this is that the coarse grain exceeds the formability of the material and cracks appear on the shear lines that form, which in the further course can lead to the pipe being torn off. In these cases, additional intermediate annealing must be carried out again.
  • the pipes either come in straight lengths, which, depending on the operating weight, can be 150 meters and more, or they are coiled in a line behind the cold pilger rolling mill, as described in DE 31 46 284 C2.
  • the coil diameter is approximately 2500 mm on average and is adapted to the drum diameter of a drum drawing machine.
  • a recrystallization annealing of the tubes wound into coils in a gas-heated continuous annealing furnace is also out of the question because these ovens are usually used Coil diameter of 2500 mm can not accommodate.
  • the existing ovens are designed for the annealing of already drawn and wound pipes that have significantly smaller coil diameters. It would be uneconomical to lay out additional ovens on larger widths.
  • the present invention proposes, starting from the known method for cold crawlage and coiling, that which is held against torsion and at a constant speed leaking cold-piled tube one-line recrystallizing glow.
  • the suggestion made in connection with the reaching of longer pipe lengths to coil the pipe after the cold crawlage in line is used to solve the problem described at the beginning of being able to carry out the recrystallization of pipes online.
  • This proposal of the invention surprisingly makes it possible to roll out continuously cast hollow bodies in the cold pilger rolling process and then to compensate for the coarse-grained casting structure, which has been improved during the roll forming, by fine-grained recrystallization. In this way, a tube is obtained which contains a structure that is uniform over the entire cross section and is therefore ideally suited for the following drawing processes.
  • the recrystallization-annealed tube is wound up in a manner known per se.
  • a system for producing pipes made of copper or copper alloys by cold pilger rolling a hollow body in a rolling mill with a reciprocating roll stand with positively driven calibrated rolls located therein with batch feed and / or rotation of the pipe in the region of one or both dead centers, at which the cylindrical uneven feed / exit speed of the rolled tube in a buffer zone is converted into a constant outlet speed and the tube is held in a constant speed driving device against torsion, is characterized by the arrangement of a continuous annealing device with subsequent cooling part following the one working at constant speed Driver.
  • a coil device for the tube which is preceded by a separating device for the tube, is preferably arranged after the cooling part of the continuous annealing device.
  • the continuous annealing device is preceded by a closure device for the start of the tube. This closure device can close the beginning of the pipe by simply pressing it together.
  • the method according to the invention and the proposed plant are characterized in particular by the fact that it enables the use of hollow continuous casting while at the same time achieving a fine-grained structure of the cold-piled pipe.
  • the system is characterized by a small size, expensive additional furnaces for extremely long pipes or large coils are not necessary, so that the advantages given by the use of the hollow body continue in the recrystallization part of the system.
  • FIG. 1, 1 denotes the continuous casting of the system, which here produces four-strand hollow bodies which, in the exemplary embodiment, have a length of 22 meters and a weight of approximately 650 kg, a diameter of 85 mm and wall thicknesses of 15 mm.
  • the hollow bodies transported via the transport roller table 2 are placed at 3 on the inlet channel of the cold vocational rolling mill, which is indicated at 4.
  • the cold pilger mill 4 reduces the hollow body to a diameter of 48 mm and a wall thickness of 2.3 mm with a total length of approx. 220 meters.
  • the cold-pilgered tube 5 leaving the cold-pilger mill 4 is guided in the outlet over the loop table 6, which serves to eliminate the cyclically uneven outlet of the tube 5 from the cold-pilger mill.
  • the closure apparatus 8 which is designed to run along rails 9 with the pipe, the pipe start of the pipe 5 is closed, so that no water can get into the pipe in the subsequent continuous annealing device with cooling part.
  • Drivers 10 and 11 transport the tube 5 through the continuous annealing device, which is indicated at 12 and whose cooling part is designated by 13. The recrystallization of the tube 5 takes place within the continuous annealing device at the appropriate temperature and then the tube is quenched in the cooling part 13 with water.
  • a flying separating device 14 provided at the outlet of the continuous annealing device 12 cleanly cuts off the tube at the front and possibly also at the rear end.
  • the coil device 15 winds the tube 5 in a basket or on a removal table, it being possible for the coil to be equipped with a tangent in order to facilitate further processing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
EP94250225A 1993-09-17 1994-09-12 Procédé de fabrication de tubes en cuivre ou en alliages de cuivre. Withdrawn EP0644272A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4332135 1993-09-17
DE4332135 1993-09-17

Publications (2)

Publication Number Publication Date
EP0644272A2 true EP0644272A2 (fr) 1995-03-22
EP0644272A3 EP0644272A3 (fr) 1995-06-07

Family

ID=6498258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94250225A Withdrawn EP0644272A3 (fr) 1993-09-17 1994-09-12 Procédé de fabrication de tubes en cuivre ou en alliages de cuivre.

Country Status (2)

Country Link
EP (1) EP0644272A3 (fr)
FI (1) FI944312A7 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004056502A1 (fr) * 2002-12-21 2004-07-08 Wieland-Werke Ag Procede et chaine de production permettant la production rationnelle de tubes d'echange thermique en forme de u
CN102699101A (zh) * 2012-05-29 2012-10-03 金川集团股份有限公司 一种HAl77-2黄铜合金管材制备方法
CN114369772A (zh) * 2021-12-08 2022-04-19 西南交通大学 具有高延伸率的梯度金属材料的制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374126A (en) * 1965-10-08 1968-03-19 Int Nickel Co Bright annealing of tubular metal articles
DE1286761B (de) * 1966-03-03 1969-01-09 Kabel Metallwerke Ghh Vorrichtung zum Gluehen von rohr- oder strangfoermigen Metallprofilen
BE878482A (fr) * 1979-08-28 1979-12-17 Crane Enfield Metals Pty Procede de preparation de tuyaux en cuivre et produits ainsi obtenus
DE3146284C2 (de) * 1981-11-19 1985-10-31 Mannesmann AG, 4000 Düsseldorf Verfahren zum Abführen von kaltgewalzten Rohren, insbesondere großer Längen
FI77057C (fi) * 1987-03-26 1989-01-10 Outokumpu Oy Foerfarande foer framstaellning av roer, staenger och band.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004056502A1 (fr) * 2002-12-21 2004-07-08 Wieland-Werke Ag Procede et chaine de production permettant la production rationnelle de tubes d'echange thermique en forme de u
CN1311926C (zh) * 2002-12-21 2007-04-25 威兰德-沃克公开股份有限公司 弯曲成u形的换热管的生产方法
US7992299B2 (en) 2002-12-21 2011-08-09 Wieland-Werke Ag Method for the economical production of heat exchanger tubes bent in a u-shape
CN102699101A (zh) * 2012-05-29 2012-10-03 金川集团股份有限公司 一种HAl77-2黄铜合金管材制备方法
CN114369772A (zh) * 2021-12-08 2022-04-19 西南交通大学 具有高延伸率的梯度金属材料的制备方法

Also Published As

Publication number Publication date
FI944312L (fi) 1995-03-18
EP0644272A3 (fr) 1995-06-07
FI944312A0 (fi) 1994-09-16
FI944312A7 (fi) 1995-03-18

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