EP2042247A1 - Piercer - Google Patents
Piercer Download PDFInfo
- Publication number
- EP2042247A1 EP2042247A1 EP08013820A EP08013820A EP2042247A1 EP 2042247 A1 EP2042247 A1 EP 2042247A1 EP 08013820 A EP08013820 A EP 08013820A EP 08013820 A EP08013820 A EP 08013820A EP 2042247 A1 EP2042247 A1 EP 2042247A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mandrel
- piercer
- radial direction
- recess
- guide
- 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- Withdrawn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
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000004080 punching Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
-
- 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
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- 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 piercing mandrel for rolling a received on the piercer hollow block, wherein the piercer has a mandrel with a mandrel arranged at the axial end of the mandrel.
- the raw material for the production of seamless pipes is usually rolled round steel, mainly round casting up to 200 millimeters in diameter, which is brought to a rolling temperature of approx. 1,280 ° C in lengths of up to 5 meters in a rotary hearth furnace.
- the solid block is punched on a piercing mill to form a thin-walled hollow block.
- a piercing mill usually a cross rolling mill is used, wherein the hollow tube block is rolled in a roll nip, by a number of rollers, preferably of three rollers, which roll the outer periphery of the tube hollow block, and a mandrel-shaped inner tool coaxial with the tube Hollow block is arranged, is formed.
- the rollers are inclined in order to achieve a sufficient flow rate by an angle between 10 ° and 12 ° to the rolling stock.
- the hollow block manufactured in the piercing mill is then rolled in the same heat in a continuous rolling mill (continuous tube rolling) via a perforated mandrel to form a billet.
- a continuous rolling mill continuous tube rolling
- the continuous rolling mill is also referred to as MPM (Multistand Plug Mill).
- the continuous rolling mill usually consists of seven to nine closely spaced rolling stands.
- the individual rolling stands are each rotated against each other, for example by 90 °.
- the roller circumferential speeds are coordinated according to the cross-sectional decreases, so that between the stands no significant tensile or compressive forces act on the rolling stock.
- the piercer Before starting the rolling process in the continuous rolling mill, the piercer is inserted or threaded into the hollow block. After reaching a certain position hollow block are then punched together with piercer in the continuous rolling mill. The rolling stock is picked up by the rolls and rolled on the piercer by the rolling caliber, which becomes smaller from stand to stand. As a result of the increasing rolling material speed, the piercer also assumes an ever increasing speed.
- the Luppenspitze enters an extractor mill following the continuous rolling mill.
- the removal of the piercer takes place on the far finished doll.
- a game between the piercer and the rolling stock can be achieved, which is evenly distributed in the last round caliber around the circumference, so that the piercer can be solved more easily.
- the retraction of the piercer takes place in the starting position, an ejection of the piercer and the insertion of a new piercer.
- a perforated mandrel circuit is required.
- about eight to ten piercers of the same dimensions are in circulation.
- the invention is therefore the object of a perforated mandrel of the type mentioned in such a way that it is possible, even with certain deformations of the mandrel rod to achieve a more uniform wall thickness of the hollow block to be produced or to be produced billet.
- the mandrel bar may have a guide section which extends in the radial direction or parallel thereto and projects beyond the axial end of the mandrel bar and which engages in a corresponding recess extending in the radial direction or parallel thereto in the mandrel.
- the mandrel rod has a recess extending in the radial direction or parallel thereto, into which engages a corresponding guide section projecting beyond the axial end of the mandrel and extending in the radial direction or parallel thereto.
- two pairs of guide portions and recesses may be arranged axially adjacent, wherein the two pairs are arranged rotated relative to each other by 90 ° about the longitudinal axis of the piercer. This is it possible that the mandrel is movable relative to the mandrel in all radial directions.
- a linear guide Between the guide portion and the recess may be formed a linear guide. Also between the axial end portion of the guide portion and the bottom of the recess may be formed a linear guide. The surface of the guide portion and the recess may be provided with a sliding bearing material. In the area of the linear guides, a lubricant can be arranged. This is, for example, a grease.
- coolant is provided in the piercer with which it can be cooled.
- the cooling means may comprise line elements with which a cooling medium can be conducted into an inner bore which expands over a predetermined axial extension in the punching mandrel.
- the outer surface of the mandrel and / or the mandrel is provided with a layer of wear-resistant material, in particular of ceramic material.
- the mandrel bar can have a slightly conical shape over its axial course, which favors the withdrawal of the mandrel bar from the finished billet in the hollow block.
- a hollow block or a billet can be made with a uniform wall thickness.
- the mandrel tip With unchanged rear axially fixed mandrel of the mandrel (the mandrel tip) is arranged with a radial clearance of a few millimeters. So there is no solid connection, such as a screw, between mandrel and mandrel before.
- the transmission of radially acting forces is avoided by the mandrel bar on the mandrel or at least reduced.
- the invention is preferably used when punching in a cross rolling mill in the production of a seamless tube.
- a piercer which has a along a longitudinal axis L réellerechende mandrel 2, at the axial end 3, a mandrel 4 is arranged.
- the perforated mandrel 1 is used in the manner mentioned above, preferably in a cross rolling mill from a hollow block in a conventional manner to roll a tube blank.
- the area in which the mandrel 4 is arranged on the mandrel bar 2 is in Fig. 2 in a first embodiment of the invention.
- the mandrel 2 has at its axial end portion on a over the entire diameter of the mandrel bar extending guide portion 5. This extends in the radial direction R.
- the mandrel 4 has a recess 6 which is designed as over the entire diameter of the mandrel 4 formed groove and also extends in the radial direction R. Consequently, the guide section 5 inserted into the recess 6 forms a linear guide 7, which makes it possible for the mandrel 4 to be movable relative to the mandrel bar 2 in the radial direction R.
- the linear guide 7 can also be formed by the frontal surfaces of the mandrel bar 2 and the mandrel 4. As in Fig. 2 can be seen, the axial end portion 8 of the guide portion 5 is the base 9 of the recess 6 against; Together, these two surfaces form a linear guide 10th
- the guide portion 5 ' may also be arranged in the mandrel 4; In this case, then has the mandrel 2 in its axial end portion of the recess 6 'to form the linear guide 7.
- a further linear guide can be provided in addition to the linear guide 7, which is constructed analogously to the linear guide 7. However, this is arranged rotated by 90 ° about the longitudinal axis L. Here engages a guide portion 5 "in a corresponding recess 6". The two pairs of guide portions 5 'and 5 "and the recesses 6' and 6" allow a relative displacement of the mandrel 4 to the mandrel 2 in all radial directions.
- the mandrel 2 and the mandrel 4 are provided in the region of the forming zones under the rolls of the stands with a wear-resistant material, for example with ceramic inserts.
- the mandrel 2 can perform a small oscillating movement during the rolling process to avoid partial overheating in the working zone.
- the piercer 1 is subjected to continuous cooling during the rolling process in the continuous rolling mill.
- a further development provides a conical mandrel 2, which facilitates the removal or rolling of the billet from the mandrel 2 following the Kontiwalzen.
Abstract
Description
Die Erfindung betrifft einen Lochdorn zum Walzen eines auf dem Lochdorn aufgenommenen Hohlblocks, wobei der Lochdorn eine Dornstange mit einem am axialen Ende der Dornstange angeordneten Dorn aufweist.The invention relates to a piercing mandrel for rolling a received on the piercer hollow block, wherein the piercer has a mandrel with a mandrel arranged at the axial end of the mandrel.
Als Ausgangsmaterial zur Herstellung nahtloser Rohre dient zumeist gewalzter Rundstahl, vorwiegend als Rundstrangguss bis 200 Millimeter Durchmesser, der in Längen bis zu 5 Meter in einem Drehherdofen auf Walztemperatur von ca. 1.280 °C gebracht wird. Nach einer Presswasserentzunderung erfolgt das Lochen des Massivblocks auf einem Lochwalzwerk zu einem dünnwandigen Hohlblock. Als Lochwalzwerk wird dabei zumeist ein Schrägwalzwerk eingesetzt, wobei der Rohr-Hohlblock in einem Walzspalt gewalzt wird, der durch eine Anzahl Walzen, vorzugsweise von drei Walzen, die den Außenumfang des Rohr-Hohlblocks walzen, und einem dornförmigen Innenwerkzeug, das koaxial zum Rohr-Hohlblock angeordnet ist, gebildet wird. Dabei sind die Walzen zwecks Erreichen einer hinreichenden Durchsatzleitung um einen Winkel zwischen 10° und 12° zur Walzgutachse geneigt.The raw material for the production of seamless pipes is usually rolled round steel, mainly round casting up to 200 millimeters in diameter, which is brought to a rolling temperature of approx. 1,280 ° C in lengths of up to 5 meters in a rotary hearth furnace. After a descaling of the press water, the solid block is punched on a piercing mill to form a thin-walled hollow block. As a piercing mill usually a cross rolling mill is used, wherein the hollow tube block is rolled in a roll nip, by a number of rollers, preferably of three rollers, which roll the outer periphery of the tube hollow block, and a mandrel-shaped inner tool coaxial with the tube Hollow block is arranged, is formed. The rollers are inclined in order to achieve a sufficient flow rate by an angle between 10 ° and 12 ° to the rolling stock.
Der im Lochwalzwerk gefertigte Hohlblock wird dann in gleicher Wärme in einem Kontiwalzwerk (kontinuierliches Rohrwalzen) über ebenfalls einem Lochdorn zu einer Luppe ausgewalzt. Dabei wird eine Längung bis zu einer vierfachen Streckung erreicht, d. h. es kommt zu einer Querschnittsabnahme bis zu 75 %. Das Kontiwalzwerk wird auch als MPM (Multistand Plug Mill) bezeichnet.The hollow block manufactured in the piercing mill is then rolled in the same heat in a continuous rolling mill (continuous tube rolling) via a perforated mandrel to form a billet. In this case, an elongation is achieved up to a fourfold extension, ie there is a reduction in cross section up to 75%. The continuous rolling mill is also referred to as MPM (Multistand Plug Mill).
Das Kontiwalzwerk besteht zumeist aus sieben bis neun dicht hintereinander liegenden Walzgerüsten. Die einzelnen Walzgerüste sind gegeneinander jeweils verdreht angeordnet, beispielsweise um jeweils 90°. Die Walzenumfangsgeschwindigkeiten werden entsprechend den Querschnittsabnahmen aufeinander abgestimmt, so dass zwischen den Gerüsten keine nennenswerten Zug- oder Stauchkräfte auf das Walzgut wirken.The continuous rolling mill usually consists of seven to nine closely spaced rolling stands. The individual rolling stands are each rotated against each other, for example by 90 °. The roller circumferential speeds are coordinated according to the cross-sectional decreases, so that between the stands no significant tensile or compressive forces act on the rolling stock.
Vor dem Beginn des Walzvorgangs im Kontiwalzwerk wird der Lochdorn in den Hohlblock eingeschoben bzw. eingefädelt. Nach dem Erreichen einer bestimmten Position werden dann Hohlblock samt Lochdorn in das Kontiwalzwerk eingestoßen. Das Walzgut wird von den Walzen erfasst und durch die von Gerüst zu Gerüst kleiner werdenden Walzkaliber auf dem Lochdorn ausgewalzt. Dabei nimmt der Lochdorn infolge der zunehmenden Walzgutgeschwindigkeit auch eine immer größer werdende Geschwindigkeit an.Before starting the rolling process in the continuous rolling mill, the piercer is inserted or threaded into the hollow block. After reaching a certain position hollow block are then punched together with piercer in the continuous rolling mill. The rolling stock is picked up by the rolls and rolled on the piercer by the rolling caliber, which becomes smaller from stand to stand. As a result of the increasing rolling material speed, the piercer also assumes an ever increasing speed.
Ist der für das Kontiwalzwerk vorgesehene Umformgrad für die Luppe erreicht, läuft die Luppenspitze in ein dem Kontiwalzwerk nachgeschaltetes Extraktorwalzwerk ein. In diesem erfolgt das Abziehen des Lochdorns auf der soweit fertigen Luppe. Durch eine ovale Kalibrierung der zumeist eingesetzten Duowalzen kann hier ein Spiel zwischen dem Lochdorn und dem Walzgut erreicht werden, das im letzten Rundkaliber gleichmäßig um den Umfang verteilt wird, so dass der Lochdorn leichter gelöst werden kann. Dann erfolgt der Rückzug des Lochdorns in die Ausgangsstellung, ein Auswerfen des Lochdorns sowie das Einlegen eines neuen Lochdorns. Bevor ein Lochdorn wieder verwendet werden kann, muß er gekühlt werden, so dass ein Lochdorn-Kreislauf erforderlich ist. Üblicherweise sind etwa acht bis zehn Lochdorne gleicher Abmessungen im Umlauf.When the degree of deformation for the billet intended for the continuous rolling mill has been reached, the Luppenspitze enters an extractor mill following the continuous rolling mill. In this, the removal of the piercer takes place on the far finished doll. Through an oval calibration of the duo-rolls mostly used here a game between the piercer and the rolling stock can be achieved, which is evenly distributed in the last round caliber around the circumference, so that the piercer can be solved more easily. Then the retraction of the piercer takes place in the starting position, an ejection of the piercer and the insertion of a new piercer. Before a piercer can be used again, it must be cooled, so that a perforated mandrel circuit is required. Usually about eight to ten piercers of the same dimensions are in circulation.
Ein sowohl beim Schrägwalzen zum Lochen von Blöcken zu Hohlblöcken als auch beim Walzen des Hohlblockes zu einer Luppe in einem mehrgerüstigen Kontiwalzwerk bekanntes Problem ist es, dass die Dornstange aufgrund der teilweise erheblichen Kräfte Verformungen erleidet. Damit bewegt sich auch der Dorn am axialen Ende der Dornstange exzentrisch zur Längsachse des Lochdorns. In der Folge kommt es zu Wanddickenungleichmäßigkeiten des Hohlblockes und der Luppe über deren Umfang. Dieselbe Problematik stellt sich auch beim Einsatz von Lochdornen (Walzstangen) mit ungenügender Geradheit oder Steifigkeit.A both in the oblique rolls for punching blocks into hollow blocks and when rolling the hollow block to a billet in a multi-stand Konti ming Known problem is that the mandrel due to the sometimes considerable forces undergoes deformations. Thus, the mandrel moves at the axial end of the mandrel eccentrically to the longitudinal axis of the piercer. As a result, there are wall thickness irregularities of the hollow block and the billet over the circumference. The same problem arises with the use of perforated mandrels (rolling rods) with insufficient straightness or rigidity.
Der Erfindung liegt daher die Aufgabe zugrunde, einen Lochdorn der eingangs genannten Art so fortzubilden, dass es möglich wird, auch bei gewissen Verformungen der Dornstange eine gleichmäßigere Wanddicke des zu fertigenden Hohlblocks bzw. der zu fertigenden Luppe zu erzielen.The invention is therefore the object of a perforated mandrel of the type mentioned in such a way that it is possible, even with certain deformations of the mandrel rod to achieve a more uniform wall thickness of the hollow block to be produced or to be produced billet.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Dorn relativ zur Dornstange in radialer Richtung verschieblich angeordnet ist. Es wird damit die Entstehung von Wanddickenabweichungen infolge radial wirkender Kräfte, die vom Lochdorn ausgehen, vermieden bzw. zumindest reduziert.This object is achieved in that the mandrel is arranged displaceable relative to the mandrel in the radial direction. It is thus the formation of wall thickness deviations due to radially acting forces emanating from the piercer, avoided or at least reduced.
Die Dornstange kann dabei einen sich in radialer Richtung oder parallel hierzu erstreckenden und über das axiale Ende der Dornstange hinaus ragenden Führungsabschnitt aufweisen, der in eine korrespondierende, in radiale Richtung oder parallel hierzu verlaufende Ausnehmung im Dorn eingreift.The mandrel bar may have a guide section which extends in the radial direction or parallel thereto and projects beyond the axial end of the mandrel bar and which engages in a corresponding recess extending in the radial direction or parallel thereto in the mandrel.
Alternativ kann entsprechend vorgesehen sein, dass die Dornstange eine sich in radiale Richtung oder parallel hierzu erstreckende Aufnehmung aufweist, in die ein über das axiale Ende des Dorns hinaus ragender korrespondierender, in radiale Richtung oder parallel hierzu verlaufender Führungsabschnitt eingreift.Alternatively, it can be provided accordingly that the mandrel rod has a recess extending in the radial direction or parallel thereto, into which engages a corresponding guide section projecting beyond the axial end of the mandrel and extending in the radial direction or parallel thereto.
Ferner können auch zwei Paare Führungsabschnitte und Ausnehmungen axial benachbart angeordnet sein, wobei die beiden Paare relativ zueinander um 90° um die Längsachse des Lochdorns verdreht angeordnet sind. Hiermit wird es möglich, dass der Dorn relativ zur Dornstange in allen radialen Richtungen beweglich ist.Further, two pairs of guide portions and recesses may be arranged axially adjacent, wherein the two pairs are arranged rotated relative to each other by 90 ° about the longitudinal axis of the piercer. This is it possible that the mandrel is movable relative to the mandrel in all radial directions.
Zwischen dem Führungsabschnitt und der Ausnehmung kann eine Linearführung ausgebildet sein. Auch zwischen dem axialen Endbereich des Führungsabschnitts und dem Grund der Ausnehmung kann eine Linearführung ausgebildet sein. Die Oberfläche des Führungsabschnitts und der Ausnehmung können mit einem Gleitlagermaterial versehen sein. Im Bereich der Linearführungen kann ein Schmiermittel angeordnet sein. Hierbei handelt es sich beispielsweise um ein Schmierfett.Between the guide portion and the recess may be formed a linear guide. Also between the axial end portion of the guide portion and the bottom of the recess may be formed a linear guide. The surface of the guide portion and the recess may be provided with a sliding bearing material. In the area of the linear guides, a lubricant can be arranged. This is, for example, a grease.
Gemäß einer Weiterbildung sind im Lochdorn Kühlmittel vorgesehen, mit denen er gekühlt werden kann. Die Kühlmittel können Leitungselemente umfassen, mit denen ein Kühlmedium in eine sich über eine vorgegebene axiale Erstreckung ausdehnende Innenbohrung im Lochdorn geleitet werden kann.According to a further development, coolant is provided in the piercer with which it can be cooled. The cooling means may comprise line elements with which a cooling medium can be conducted into an inner bore which expands over a predetermined axial extension in the punching mandrel.
Zur Erzielung einer langen Lebensdauer kann vorgesehen werden, dass die Außenoberfläche der Dornstange und / oder des Dorns mit einer Schicht aus verschleißfestem Material, insbesondere aus keramischem Material, versehen ist.To achieve a long service life can be provided that the outer surface of the mandrel and / or the mandrel is provided with a layer of wear-resistant material, in particular of ceramic material.
Schließlich kann die Dornstange über ihren axialen Verlauf eine leicht konische Form aufweisen, was den Abzug der Dornstange von der fertigen Luppe in dem Hohlblock begünstigt.Finally, the mandrel bar can have a slightly conical shape over its axial course, which favors the withdrawal of the mandrel bar from the finished billet in the hollow block.
Durch die erfindungsgemäßen Maßnahmen kann ein Hohlblock bzw. eine Luppe mit gleichmäßigerer Wanddicke gefertigt werden. Bei unverändert hinten axial festgelegter Dornstange wird der Dorn (die Dornspitze) mit radialem Spiel von wenigen Millimetern angeordnet. Es liegt also keine feste Verbindung, wie beispielsweise eine Verschraubung, zwischen Dornstange und Dorn vor.By the measures according to the invention, a hollow block or a billet can be made with a uniform wall thickness. With unchanged rear axially fixed mandrel of the mandrel (the mandrel tip) is arranged with a radial clearance of a few millimeters. So there is no solid connection, such as a screw, between mandrel and mandrel before.
Durch die vorgeschlagene Ausgestaltung wird die Übertragung radial wirkender Kräfte von der Dornstange auf den Dorn vermieden oder zumindest reduziert.The proposed embodiment, the transmission of radially acting forces is avoided by the mandrel bar on the mandrel or at least reduced.
Die Erfindung kommt bevorzugt beim Lochen in einem Schrägwalzwerk bei der Herstellung eines nahtlosen Rohres zum Einsatz.The invention is preferably used when punching in a cross rolling mill in the production of a seamless tube.
In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:
- Fig. 1
- schematisch die Seitenansicht eines Lochdorns für die Herstellung einer Luppe aus einem Hohlblock;
- Fig. 2
- eine vergrößerte Ansicht des rechten Teils des Lochdorns nach
Fig. 1 gemäß einer ersten Ausführungsform der Erfindung; und - Fig. 3
- in der Darstellung gemäß
Fig. 2 eine hierzu alternativ Ausführungsform der Erfindung.
- Fig. 1
- schematically the side view of a piercing pin for the production of a billet from a hollow block;
- Fig. 2
- an enlarged view of the right part of the piercer after
Fig. 1 according to a first embodiment of the invention; and - Fig. 3
- in the illustration according to
Fig. 2 an alternative embodiment of the invention.
In
Der Bereich, in dem der Dorn 4 an der Dornstange 2 angeordnet ist, ist in
Die Linearführung 7 kann auch durch die stirnseitigen Flächen der Dornstange 2 und des Dorns 4 gebildet werden. Wie in
Wie das alternative Ausführungsbeispiel gemäß
Wie in
Die Dornstange 2 und der Dorn 4 sind im Bereich der Umformzonen unter den Walzen der Walzgerüste mit einem verschleißfesten Material versehen, beispielsweise mit Keramikeinsätzen.The
Die Dornstange 2 kann während des Walzvorganges eine kleine oszillierende Bewegung ausführen, um eine partielle Überhitzung in der Arbeitszone zu vermeiden.The
Bei allen Lösungen kann vorgesehen werden, dass der Lochdorn 1 einer kontinuierlichen Kühlung während des Walzvorgangs im Kontiwalzwerk unterzogen wird.In all solutions can be provided that the piercer 1 is subjected to continuous cooling during the rolling process in the continuous rolling mill.
Eine Weiterbildung sieht eine konisch ausgebildete Dornstange 2 vor, was das Abziehen bzw. Abwalzen der Luppe von der Dornstange 2 im Anschluß an das Kontiwalzen erleichtert.A further development provides a
- 11
- Lochdornpiercer
- 22
- Dornstangemandrel
- 33
- axiales Endeaxial end
- 44
- Dornmandrel
- 55
- Führungsabschnittguide section
- 5'5 '
- Führungsabschnittguide section
- 5"5 '
- Führungsabschnittguide section
- 66
- Ausnehmungrecess
- 6'6 '
- Ausnehmungrecess
- 6"6 "
- Ausnehmungrecess
- 77
- Linearführunglinear guide
- 88th
- axialer Endbereich des Führungsabschnittsaxial end portion of the guide portion
- 99
- Grund der AusnehmungReason of the recess
- 1010
- Linearführunglinear guide
- RR
- radiale Richtungradial direction
- LL
- Längsachselongitudinal axis
Claims (12)
dadurch gekennzeichnet,
dass der Dorn (4) relativ zur Dornstange (2) in radialer Richtung (R) verschieblich angeordnet ist.Piercing mandrel (1) for rolling a hollow block accommodated on the piercer (1), the piercer (1) having a mandrel bar (2) with a mandrel (4) arranged at the axial end (3) of the mandrel bar (2),
characterized,
in that the mandrel (4) is displaceable relative to the mandrel rod (2) in the radial direction (R).
dadurch gekennzeichnet,
dass die Dornstange (2) mindestens einen sich in radialer Richtung (R) oder parallel hierzu erstreckenden und über das axiale Ende der Dornstange (2) hinaus ragenden Führungsabschnitt (5) aufweist, der in mindestens eine korrespondierende, in radiale Richtung (R) oder parallel hierzu verlaufende Ausnehmung (6) im Dorn (4) eingreift.Mandrel according to claim 1,
characterized,
in that the mandrel bar (2) has at least one guide section (5) extending in the radial direction (R) or parallel thereto and projecting beyond the axial end of the mandrel bar (2), which in at least one corresponding, radial direction (R) or parallel thereto extending recess (6) in the mandrel (4) engages.
dadurch gekennzeichnet,
dass die Dornstange (2) mindestens eine sich in radiale Richtung (R) oder parallel hierzu erstreckende Ausnehmung (6') aufweist, in die mindestens ein über das axiale Ende des Dorns (4) hinaus ragender korrespondierender, in radiale Richtung (R) oder parallel hierzu verlaufender Führungsabschnitt (5') eingreift.Mandrel according to claim 1,
characterized,
that the mandrel (2) has at least one in radial direction (R) or parallel thereto extending recess (6 '), in which at least one beyond the axial end of the mandrel (4) also projecting corresponding, in the radial direction (R) or parallel thereto extending guide portion (5 ') engages.
dadurch gekennzeichnet,
dass zwei Paare (5', 6'; 5", 6") Führungsabschnitte (5', 5") und Ausnehmungen (6', 6") axial benachbart angeordnet sind, wobei die beiden Paare (5', 6'; 5", 6") relativ zueinander um 90° um die Längsachse (L) des Lochdorns (1) verdreht angeordnet sind.A piercer according to claim 2 or 3,
characterized,
in that two pairs (5 ', 6', 5 ", 6") are arranged axially adjacent guide sections (5 ', 5 ") and recesses (6', 6"), the two pairs (5 ', 6';",6") relative to each other by 90 ° about the longitudinal axis (L) of the piercer (1) are arranged rotated.
dadurch gekennzeichnet,
dass zwischen dem Führungsabschnitt (5, 5', 5") und der Ausnehmung (6, 6', 6") eine Linearführung (7) ausgebildet ist.Punching mandrel according to one of claims 2 to 4,
characterized,
in that a linear guide (7) is formed between the guide section (5, 5 ', 5 ") and the recess (6, 6', 6").
dadurch gekennzeichnet,
dass zwischen dem axialen Endbereich (8) des Führungsabschnitts (5, 5', 5") und dem Grund (9) der Ausnehmung (6, 6', 6") eine Linearführung (10) ausgebildet ist.Punching mandrel according to one of claims 2 to 5,
characterized,
in that a linear guide (10) is formed between the axial end region (8) of the guide section (5, 5 ', 5 ") and the base (9) of the recess (6, 6', 6").
dadurch gekennzeichnet,
dass die Oberfläche des Führungsabschnitts (5, 5', 5") und der Ausnehmung (6, 6', 6") mit einem Gleitlagermaterial versehen sind.A piercer according to claim 5 or 6,
characterized,
that the surface of the guide portion (5, 5 ', 5 ") and the recess (6, 6', 6") are provided with a sliding bearing material.
dadurch gekennzeichnet,
dass im Bereich der Linearführung (7, 10) ein Schmiermittel zuführbar ist.Punching mandrel according to one of claims 5 to 7,
characterized,
in that a lubricant can be supplied in the region of the linear guide (7, 10).
gekennzeichnet durch
eine Versorgung mit einem Kühlmittel.Mandrel according to one of claims 1 to 8,
marked by
a supply of a coolant.
dadurch gekennzeichnet,
dass eine sich über eine vorgegebene axiale Erstreckung ausdehnende Innenbohrung im Lochdorn (1) als Kühlmittel-Zuleitung vorgesehen ist.Punching mandrel according to claim 9,
characterized,
in that an inner bore which expands over a predetermined axial extent is provided in the piercer (1) as a coolant supply line.
dadurch gekennzeichnet,
dass die Außenoberfläche der Dornstange (2) und / oder des Dorns (4) mit einer Schicht aus verschleißfestem Material, insbesondere aus keramischem Material, versehen ist.Mandrel according to one of claims 1 to 10,
characterized,
in that the outer surface of the mandrel bar (2) and / or of the mandrel (4) is provided with a layer of wear-resistant material, in particular of ceramic material.
dadurch gekennzeichnet,
dass die Dornstange (2) über ihren axialen Verlauf eine leicht konische Form aufweist.Punching mandrel according to one of claims 1 to 11,
characterized,
that the mandrel rod (2) has a slightly conical shape over its axial course.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007045934 | 2007-09-25 | ||
DE102008031569A DE102008031569A1 (en) | 2007-09-25 | 2008-07-07 | Mandrel for rolling of hollow ingot, has mandrel bar with thorn arranged at axial end of mandrel bar, where thorn is arranged in relocated manner relative to mandrel bar in more radial direction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2042247A1 true EP2042247A1 (en) | 2009-04-01 |
Family
ID=39764967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08013820A Withdrawn EP2042247A1 (en) | 2007-09-25 | 2008-08-01 | Piercer |
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Country | Link |
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EP (1) | EP2042247A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014067514A1 (en) * | 2012-11-03 | 2014-05-08 | Hans Joachim Pehle | Method and device for producing seamless steel pipes having low eccentricity |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE534112C (en) * | 1931-09-23 | Ver Stahlwerke Akt Ges | A mandrel for tube rolling mills consisting of mandrel head and mandrel bar | |
JPS59206105A (en) * | 1983-05-10 | 1984-11-21 | Sumitomo Metal Ind Ltd | Manufacture of seamless pipe |
EP1764167A1 (en) * | 2005-09-20 | 2007-03-21 | SMS Meer GmbH | Method and rolling mill for manufacturing a seamless tube |
-
2008
- 2008-08-01 EP EP08013820A patent/EP2042247A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE534112C (en) * | 1931-09-23 | Ver Stahlwerke Akt Ges | A mandrel for tube rolling mills consisting of mandrel head and mandrel bar | |
JPS59206105A (en) * | 1983-05-10 | 1984-11-21 | Sumitomo Metal Ind Ltd | Manufacture of seamless pipe |
EP1764167A1 (en) * | 2005-09-20 | 2007-03-21 | SMS Meer GmbH | Method and rolling mill for manufacturing a seamless tube |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014067514A1 (en) * | 2012-11-03 | 2014-05-08 | Hans Joachim Pehle | Method and device for producing seamless steel pipes having low eccentricity |
CN104968447A (en) * | 2012-11-03 | 2015-10-07 | 汉斯·约阿希姆·佩勒 | Method and device for producing seamless steel pipes having low eccentricity |
US9616475B2 (en) | 2012-11-03 | 2017-04-11 | Hans Joachim Pehle | Method and device for producing seamless steel pipes having low eccentricity |
RU2652667C2 (en) * | 2012-11-03 | 2018-04-28 | Ханс Йоахим ПЕЛЕ | Method and device for producing seamless steel pipes having low eccentricity |
CN104968447B (en) * | 2012-11-03 | 2019-03-12 | 汉斯·约阿希姆·佩勒 | Method and apparatus for producing low eccentricity seamless steel pipe |
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