EP0787542A2 - Mandrin et tige porte-mandrin pour laminoirs obliques - Google Patents

Mandrin et tige porte-mandrin pour laminoirs obliques Download PDF

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Publication number
EP0787542A2
EP0787542A2 EP97250015A EP97250015A EP0787542A2 EP 0787542 A2 EP0787542 A2 EP 0787542A2 EP 97250015 A EP97250015 A EP 97250015A EP 97250015 A EP97250015 A EP 97250015A EP 0787542 A2 EP0787542 A2 EP 0787542A2
Authority
EP
European Patent Office
Prior art keywords
rolling
rod
mandrel
dome
water
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.)
Granted
Application number
EP97250015A
Other languages
German (de)
English (en)
Other versions
EP0787542A3 (fr
EP0787542B1 (fr
Inventor
Karl-Heinz Ing. Häusler
Siegfried Dipl.-Ing. Oehme
Werner Dipl.-Ing. Henze
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 EP0787542A2 publication Critical patent/EP0787542A2/fr
Publication of EP0787542A3 publication Critical patent/EP0787542A3/fr
Application granted granted Critical
Publication of EP0787542B1 publication Critical patent/EP0787542B1/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
    • 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
    • B21B25/04—Cooling or lubricating mandrels during operation

Definitions

  • the invention relates to a method and an apparatus for performing the rolling for the production of seamless tubes from heated solid metal blocks, in particular on a Mannesmann cross-rolling mill, in which the block is driven through the inclined rolls and pressed over an internal tool that comes from an internally cooled roll dome exists, which is releasably attached to a rolling rod through which both water for cooling the rolling dome and inert gas for introduction into the resulting hollow block can be passed, the rolling rod being supported against a mandrel abutment during rolling with its end facing away from the rolling mandrel.
  • the piercing mandrel Since the piercing mandrel has to do its work under the influence of the rolling heat, it is subjected to extreme stress and has a limited lifespan. Since the invention of the cross rolling process, the cross roll has been endeavoring to extend the service life of the rolling mandrels, to save costs and improve the quality of the rolled pipes. If the service life of the roll mandrel is nearing its end, the roll mandrel can lose its shape, get a damaged surface or welded material. This also means a deterioration in the pipe quality.
  • Tinder leads to imperfect welding of the tears in the loosened core zone and thus to the formation of shells and cracks on the inner surface of the tube during further processing of the hollow blocks.
  • DE-PS 34 32 288 contains a device with which both water for internal cooling of the rolling mandrel and inert gas are supplied through the rolling rod.
  • the same Japanese device describes the same device 61-002446.
  • the water supply and drainage lines and the inert gas supply could be connected to the rotating roller rod relatively easily, because the roller rods are firmly connected to the mandrel abutment and the connections do not have to be loosened when the dome abutment moves back after the rolling has ended.
  • the rolling rod with the roll dome is pulled out of the rolled hollow block in order to be able to remove the hollow block.
  • Pipes with high-quality inner surfaces are produced directly from a hollow block by cold processing, such as thin-walled copper pipes, pulling out the rolling rod from the hollow block is prohibited because the rolling mandrel that slides on the inner surface can cause damage to the inner surface of the hollow block.
  • a stationary mandrel abutment has been developed, against which the rolling rod is only loosely supported during rolling. After rolling is completed, the dome abutment is simply pivoted away to the side or up or down and the hollow block is pulled off the rolling rod in the rolling direction. Since he no longer has to pass through the rolling mandrel, the feared damage is eliminated.
  • a significant increase in the service life can be achieved, in particular when cross-rolling copper, by internally cooling the roll dome with water. At the same time, however, the blowing in of inert gas cannot be dispensed with, just as little as there is no pivotable dome abutment, i.e. withdrawing the rolled hollow block from the stationary mandrel bar.
  • a fine grain is advantageous for good cold processing capability of the copper. This is how the standards become one.
  • certain fine grain size prescribed on the other hand, a fine grain structure increases the stretchability of the material for producing a thin-walled finished tube before an intermediate annealing process must be switched on. Efforts are therefore made to immediately quench the rolled material after hot forming in order to limit subsequent grain growth if possible.
  • the hollow block behind the rolling zone is cooled as quickly as possible by water showers or introduced directly into a water basin to quench the material.
  • the object of the invention is therefore to provide a method and a device which combines all of the aforementioned advantages without accepting the disadvantages.
  • a method using a generic system for the production of pipes is proposed, which is characterized in that the water is returned for cooling the rolling mandrel and at a position as close as possible behind the forming zone of the rolls for quenching the inside of the hollow block into the space between Roll rod and hollow block inside is passed, that at the same time the forming zone around the rolling mandrel is placed under inert gas to prevent oxidation of the hollow block inner surface, the inert gas acting as a barrier against the ingress of water into the forming zone between the dome and the hollow block and that the hollow block immediately after is pulled from the rod in the rolling direction.
  • both the service life of the rolling mandrels and the quality of the tube can be significantly improved. While the harmful oxidation inside the hollow block is reliably suppressed by the introduction of the inert gas and at the same time the penetration of water is prevented, the water cools the rolling mandrel in a conventional manner to increase the service life. Both measures are combined with the possibility of pulling the hollow block from the mandrel in the rolling direction, i.e. over the roller rod so that damage to the inner surface of the hollow block is prevented by the mandrel.
  • An internal tool device for carrying out the method is characterized in that at least the water for cooling the rolling dome is fed through the mandrel abutment into the rolling rod, which is in a stationary position during the rolling process by means of a pivoting abutment which can be removed from the rolling line for loading the rolling rod is definable.
  • a sleeve sealed by sealing rings and coaxially rotatable around the rolling rod is attached to the end piece of the rolling rod, in which radially attached Holes are located on the one hand to an annular channel provided in the rolling rod, which is connected to the lines inside the rolling rod and, on the other hand, lead to an annular channel which is provided on the inside of a releasable inert gas supply which engages around the rolling rod.
  • the sleeve surrounding the roller rod like a pliers can be easily released by opening the "pliers " and thereby also allows unhindered handling of the roller rod and the hollow block when stripping.
  • the cooling water conducted through the mandrel abutment into the rolling rod also be drained through the dome abutment. It is also conceivable that the cooling water supplied through the dome abutment is carried out through radial bores provided in the roll rod into the area behind the roll dome. Finally, it can also be provided that the cooling water conducted through the dome abutment into the rolling rod is selectively switchable through the dome abutment or through radial bores provided in the rolling rod into the area behind the rolling mandrel. In all cases, the cooling water is supplied through the mandrel abutment without the need to connect additional connections to the roll rod.
  • the optional switching of the cooling water discharge can be achieved by shifting the inner pipe that conducts the cooling water, by means of which the corresponding outlet openings are closed or opened in the shifting end positions.
  • the intensity of the internal cooling of the hollow block can advantageously be controlled via the amount of water emerging from the roller rod.
  • the device according to the invention consists in the main elements of a rolling rod 1 with the screwed-on rolling dome 2 and the swivel abutment 3.
  • the mandrel 2 is hollow and relatively thin-walled for effective internal cooling.
  • the inner surface 4 of the mandrel is corrugated.
  • the rolling mandrel 2 is screwed onto the intermediate piece 6 of the rolling rod 1 with a thread 5. Since no cooling water may penetrate to the outside at the screwing point, a sealing ring 8 is inserted into a groove 9 of the intermediate piece 6. The same is repeated for the intermediate piece 7 with the sealing ring 50.
  • the sealing rings 8 and 50 can consist of a squeezable metal due to the action of heat.
  • the intermediate piece 6 is connected to the intermediate piece 7 by the thread 14.
  • the cooling water is passed through the pipe 11 into the rolling dome 2, runs outside on the pipe 11 back into the annular gap 21 and from there passes through the outlet bores 22 into the annular gap which is formed between the rolling rod 1 and the hollow block 10.
  • the tube 11 is secured by the stop 51 against slipping in the longitudinal direction and sealed by the seal 52. From the point at which the water emerges from the bores 22 of the intermediate piece 7, the hollow block 10 is cooled from the inside. The water leaves the hollow block 10 in the rolling direction.
  • the inert gas passes through the annular gap 23 and the bores 24 and 25 in front of the rolling mandrel 2 and leaves the rolling rod 1 through the outlet bores 27 which are located in the intermediate piece 6.
  • annular channel 26 is arranged between the two.
  • the exit bores 27 for the inert gas are closer to the mandrel 2 than the bores 22 for the cooling water.
  • the overpressure of the inert gas ensures that the cooling water cannot penetrate into the forming zone of the hollow block 10.
  • a circumferential bead 28 on the intermediate piece 7 also narrows the annular gap between the rolling rod 1 and the hollow block 10 and thus further reduces the risk of water or water vapor entering the forming zone.
  • the forming zone is formed by the rollers 43 and the mandrel 2.
  • the inert gas leaves the hollow block 10 in the same way as the cooling water.
  • FIG. 2 The inflow of cooling water and inert gas into the rolling rod 1 is shown in FIG. 2. This is the point at which the loose rolling rod 1 lying in the rolling position is supported against the turntable 29 of the swivel abutment 3.
  • the turntable 29 has the conical centering 30.
  • the cooling water is introduced into the central bore 19 of the rolling rod 1 through the inlet bore 31 and fed to the rolling mandrel 2 through the pipe 11.
  • the water and inert gas connections must be separated from each other so that no water can flow into the inert gas line.
  • a sleeve 32 is loosely attached to the end piece 18 of the rolling rod 1, which sleeve can rotate on the end piece 18 and which is sealed by the sealing rings 33.
  • Radial holes 34 are provided in the sleeve 32.
  • an opening and closing pincer-like inert gas supply 35 is pressed onto the sleeve 32, as shown in FIG. 3, the inert gas passing through the annular channel 36 and the bores 34 into the annular channel 38. From here, the gas flows through a plurality of radially provided bores 39 and is transported through the annular gap 44 into the front part of the rolling rod 1.
  • the device is supplied with inert gas via the hose connection 49.
  • the inert gas supply 35 is sealed according to FIG. 2 on the sleeve 32 by the seals 37.
  • the end piece 18 is screwed to the intermediate piece 16 via the thread 17, which in turn is welded to the pipe 15.
  • the inert gas supply 35 is opened together with the swivel abutment 3 when a hollow block is to be pulled off the roller rod.
  • the internal cooling of the hollow block 10 with water is dispensed with.
  • the water inside the roller rod 1 is returned and exits at the rear end of the rod. 4
  • the water is fed into the rolling mandrel 2 via the pipe 11 and runs back through the pipe 13, which surrounds the pipe 11, back to the rod end.
  • the tube 11 is centered by the spacers 12 in the intermediate piece 6 and secured against displacement in the longitudinal direction.
  • the tube 13 is sealed by means of the sealing rings 45.
  • the intermediate piece 6 is screwed together with the intermediate piece 7 via the thread 14.
  • the intermediate piece 7 is in turn welded to the tube 15 of the rolling rod 1.
  • the tubes 11 and 13 can be removed by unscrewing the end piece 18.
  • the inert gas passes through the annular gap 23 into the front part of the rolling rod 1 and leaves it through the outlet bores 27a, which are arranged in the intermediate piece 7.
  • the opposite end of the rolling rod 1 is shown in FIG. 5.
  • the intermediate piece 16 is welded to the pipe 15 and connected to the end piece 18 via the thread 17.
  • the tube 11 extends into the end piece 18 and enables the water to be supplied through the central bore 19.
  • the water flowing back through the pipe 13 reaches the annular gap 44 in the region of the end piece 18 and is discharged via the bores 20.
  • the turntable 29 with its conical centering 30 is additionally equipped for collecting the return water with the annular space 46, which collects the water and feeds it through the holes 47 in a manner not shown to a rotary connection arranged on the turntable 29, which in one Hose connection merges.
  • a seal 48 seals the rod seat in the turntable 29.
  • connection of the inert gas is carried out in the manner already described.
  • the bores 39 merge into the longitudinal bores 40. From here, the inert gas is passed through the annular gap 23 to the front part of the rolling rod 1.
  • the tube 13 is displaceable in the longitudinal direction.
  • the bores 22 are covered.
  • the cooling water flows back through the annular gap 21 and in the further course between the outer wall of the tube 11 and the inner wall of the tube 13 to the rear part of the rolling rod 1.
  • the holes 22 are released and the water can now flow out of the roller rod 1 through these holes.
  • the drain is closed by a switching valve (not shown in the drawing) at the rear end of the roller rod.
  • a switching valve not shown in the drawing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP97250015A 1996-02-02 1997-01-29 Procédé de fabrication de tube sans soudure et mandrin pour mise en oeuvre le procédé Expired - Lifetime EP0787542B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19604969A DE19604969C2 (de) 1996-02-02 1996-02-02 Verfahren zur Herstellung von nahtlosen Rohren und Innenwerkzeug
DE19604969 1996-02-02

Publications (3)

Publication Number Publication Date
EP0787542A2 true EP0787542A2 (fr) 1997-08-06
EP0787542A3 EP0787542A3 (fr) 1998-10-28
EP0787542B1 EP0787542B1 (fr) 2003-11-26

Family

ID=7785101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97250015A Expired - Lifetime EP0787542B1 (fr) 1996-02-02 1997-01-29 Procédé de fabrication de tube sans soudure et mandrin pour mise en oeuvre le procédé

Country Status (3)

Country Link
EP (1) EP0787542B1 (fr)
DE (2) DE19604969C2 (fr)
ES (1) ES2206654T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433281A (zh) * 2013-08-28 2013-12-11 无锡欧龙特种钢管有限公司 一种无缝管穿孔机顶头冷却装置
CN106825051A (zh) * 2017-03-24 2017-06-13 山西容合易工业科技有限公司 一种无缝钢管穿孔机顶杆
EP3718655A4 (fr) * 2017-11-29 2021-09-15 Nippon Steel Corporation Machine de perçage, barre de mandrin et procédé de fabrication de tube métallique sans soudure l'utilisant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101505525B1 (ko) 2010-06-08 2015-03-24 코팅 매니지먼트 스위처랜드 게엠베하 심리스 파이프를 생산하는 방법
DE102011012761A1 (de) 2011-03-01 2012-05-24 Sms Meer Gmbh Verfahren und Vorrichtung zum Erzeugen eines Hohlblocks, Innenwerkzeug mit einer Dornstange und einem Lochdorn, Verwendung eines Innenwerkzeugs und Verwendung eines Deoxidationsmittels
RU2549022C1 (ru) * 2013-10-07 2015-04-20 Акционерное общество "Выксунский металлургический завод" Способ горячей винтовой раскатки гильз и технологический инструмент для его осуществления
RU2568805C1 (ru) * 2014-05-27 2015-11-20 Открытое акционерное общество "Российский научно-исследовательский институт трубной промышленности" (ОАО "РосНИТИ") Охлаждаемая оправка косовалкового стана и способ ее охлаждения

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE383240C (de) * 1921-07-14 1923-10-11 Abteilung Duesseldorfer Roehre Vorrichtung zur Ausfuehrung des Verfahrens zur Herstellung gelochter Metallrohrbloecke
DE594215C (de) * 1932-06-21 1934-03-19 Leo Becker Schraegwalzwerk oder Rohrpresse zur Herstellung von nahtlosen Rohren
US2159123A (en) * 1936-11-09 1939-05-23 Nat Tube Co Rolling mill mandrel
US2237983A (en) * 1937-01-21 1941-04-08 Nat Tube Co Pipe or tube rolling
DE3123645A1 (de) * 1981-06-15 1982-12-30 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover "verfahren zur herstellung nahtloser kupferrohre"
JPS5835005A (ja) * 1981-08-27 1983-03-01 Sumitomo Metal Ind Ltd マンネスマン穿孔機による穿孔方法
JPS5933010A (ja) * 1982-08-19 1984-02-22 Kawasaki Steel Corp 継目無鋼管製造用穿孔装置
JPS60130406A (ja) * 1983-12-20 1985-07-11 Kawasaki Steel Corp 継目無鋼管の製造方法およびその装置
DE3432288C2 (de) * 1984-09-01 1987-01-02 Kocks Technik Gmbh & Co, 4010 Hilden Anwendung von Inertgas beim Herstellen nahtloser Rohre
DE4004155A1 (de) * 1990-02-10 1991-08-14 Kocks Technik Verfahren und vorrichtung zum kuehlen und schmieren von dornstangen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433281A (zh) * 2013-08-28 2013-12-11 无锡欧龙特种钢管有限公司 一种无缝管穿孔机顶头冷却装置
CN106825051A (zh) * 2017-03-24 2017-06-13 山西容合易工业科技有限公司 一种无缝钢管穿孔机顶杆
CN106825051B (zh) * 2017-03-24 2018-11-02 山西容合易工业科技有限公司 一种无缝钢管穿孔机顶杆
EP3718655A4 (fr) * 2017-11-29 2021-09-15 Nippon Steel Corporation Machine de perçage, barre de mandrin et procédé de fabrication de tube métallique sans soudure l'utilisant
US11344935B2 (en) * 2017-11-29 2022-05-31 Nippon Steel Corporation Piercing machine, mandrel bar, and method for producing seamless metal pipe using the same

Also Published As

Publication number Publication date
DE59711039D1 (de) 2004-01-08
EP0787542A3 (fr) 1998-10-28
ES2206654T3 (es) 2004-05-16
DE19604969C2 (de) 2000-08-24
DE19604969A1 (de) 1997-08-07
EP0787542B1 (fr) 2003-11-26

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