EP0849010B1 - Method and device for cold rolling tubes and bars - Google Patents
Method and device for cold rolling tubes and bars Download PDFInfo
- Publication number
- EP0849010B1 EP0849010B1 EP97250369A EP97250369A EP0849010B1 EP 0849010 B1 EP0849010 B1 EP 0849010B1 EP 97250369 A EP97250369 A EP 97250369A EP 97250369 A EP97250369 A EP 97250369A EP 0849010 B1 EP0849010 B1 EP 0849010B1
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- Prior art keywords
- run
- transport mechanism
- rolled
- transport
- out side
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- 238000000034 method Methods 0.000 title claims description 16
- 238000005097 cold rolling Methods 0.000 title 1
- 238000005096 rolling process Methods 0.000 claims description 50
- 230000007723 transport mechanism Effects 0.000 claims 11
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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Classifications
-
- 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
- B21B21/06—Devices for revolving work between the steps
- B21B21/065—Devices for revolving work between the steps for reciprocating stands
-
- 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
- B21B2015/0028—Drawing the rolled 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
-
- 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
- B21B21/04—Pilgrim-step feeding mechanisms
- B21B21/045—Pilgrim-step feeding mechanisms for reciprocating stands
Definitions
- the invention relates to a method for cold crawlage, in particular of extreme thin-walled tubes and rods of small diameter, on one Cold pilger rolling mill with a reciprocating mill stand.
- rotation and feed are fixed over a stationary one Rotary feed head with rotating chains causes, the chain links the Enclose the tube blank and transport it in the rolling direction using friction.
- the Rotary feed head is driven by a planetary gear and thus causes simultaneous rotation of the tube blank.
- the object of the present invention is based on the described state to propose to the technology a method for cold mushrooms with the extreme thin-walled, especially small pipes or rods of small diameter are rolled can be without the risk of buckling or rolling.
- the invention provides for the rolling stock to be taken on the outlet side behind the roll stand and pull through the rolling zone. In this way, the critical pressure and / or Buckling stresses are avoided in the rolling stock and thus also with it caused disturbances in the rolling process.
- the transport device arranged on the outlet side is assigned to the inlet-side rotary and feed drive, at least temporarily takes over the feed and rotation of the piled rolling stock and its movement sequence on the movement sequence of the outlet side Transport device is coordinated.
- the rolling stock can initially by inlet-side device in the forming zone of the roll stand and be rolled on, after the beginning of the piled rolling stock has reached the outlet-side transport device and is detected there on its circumference, the rotary feed drive arranged on the inlet side can be switched so that only the outlet-side transport device the forward transport of the rolling stock takes over.
- the transport device arranged on the outlet side also includes a little compared to the outlet speed of the piled rolling stock increased transport speed can be operated from the roll stand. That means, that a tensile force is always exerted on the piled rolling stock, so that with Safety avoided the critical compressive and / or buckling stresses in the rolling stock become. Furthermore, tensile stress can be applied to the rolling stock from the outside increase the formability of the rolling stock.
- the turning and Feed drive independent of the outlet-side transport device can be switched off, so that the different states during rolling be recorded.
- rolling the rolling stock it is only necessary that to operate the inlet-side rotating and feeding device. The moment that piled rolling stock has left the roll stand and into the outlet side Transport device was introduced, the forward transport of the Take over the rolling stock so that the inlet-side rotary feed drive is switched off can be.
- both the rotary feed drive as well as the outlet-side transport device together switch, the tuning of the drives shown in claim 1 is to be observed.
- At least the discharge-side transport device as a fixed rotary feed head with rotating Chains is formed, the chain links enclose the tube blank and by means of Transport friction in the rolling direction.
- Such devices are known per se; So far they have been used as a rotary feed drive in front of the roll stand can replace the inlet chuck of conventional cold pilger rolling mills.
- the Rolling stock beginning with the finished diameter of the piled rolling stock appropriate diameter taper is provided from the inlet side inserted through the roll stand into the transport device becomes.
- Such a threading procedure is particularly necessary if only an outlet-side transport device with the features of the invention is used. This case is applicable if it is very long or almost endlessly long Poles or slabs are to be rolled. In this case, the rolling stock only has to once in the outlet-side transport device and can then transported almost endlessly and thereby "pulled" through the forming zone become.
- the narrowing of the diameter for threading the rolling stock can be achieved, for example, by Pulling the beginning of the rolling stock can be produced in a pulling device; they are too Devices conceivable, such as those used to form drawing bars in front of drawing machines are known.
- the diameter taper can also are formed by a rod which is coaxial at the front end of the rolling stock is attached.
- the present invention can advantageously ensure that when rolling Blanks introduced immediately one after the other do not wedge or roll into each other the pipe ends appear; because the features of the invention ensure that Always keep a small distance between two successive holes e.g. 20 mm at the joint of two loops.
- very thin-walled tubes can with a wall thickness-to-diameter ratio of ⁇ 1:40, which is has not been possible so far or has been difficult
- the invention increases process reliability of the cold mitage process and avoids interference.
- the invention is equally for pipes like also applicable for wires and small profiles.
- the drawing figure shows a cold pilger mill 1, which, like the double arrow indicated above the cold pilger roll stand, oscillating back and forth.
- the Oscillating movement of the cold pilger stand 1 is carried out by an underlying (Not shown) crank drive generated.
- the roller pair 2 rotates synchronously the movement of the roll stand 1, driven by pinions on the roll axes, the correspond with fixed racks.
- the rollers are calibrated so that the rolling stock is in the two dead spots of the stand is released in each case.
- the rotary and pushes to these release zones Feed drive 3 with 6 designated in the direction of arrow 7 and rotates them at the same time by a predetermined angular amount.
- In the Longitudinal transport movement of the transport device on the outlet side is the The course of the stretching of the rolling stock during rolling must be taken into account.
- the Subsequent second blank 5 is placed at a distance of approximately 20 mm in the rotary feed device 3 inserted so that the ends of successive tubes themselves do not touch, not even in the reduction area.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Kaltpilgern, insbesondere von extrem dünnwandigen Rohren und Stangen kleinen Durchmessers, auf einem Kaltpilgerwalzwerk mit in einem hin- und herbewegten Walzgerüst.The invention relates to a method for cold pilgrimage, in particular of extreme thin-walled tubes and rods of small diameter, on one Cold pilger rolling mill with a reciprocating mill stand.
Aus der SU-A-863025 ist eine Vorrichtung zum Kaltpilgern von Rohren bekannt, bei
der eine Transportvorrichtung zum Drehen und Vorwärtstransportieren des zu
walzenden Rohres vorgesehen ist.
Dreh-und Vorschubeinrichtungen sind ebenfalls in der DE -C- 3717165 sowie der JP-A-63-84704
beschrieben.From SU-A-863025 a device for cold pilgrimage of pipes is known, in which a transport device is provided for rotating and transporting the pipe to be rolled.
Rotary and feed devices are also described in DE-C-3717165 and JP-A-63-84704.
Kaltpilgerwalzwerke mit einem hin- und herbewegten Walzgerüst benötigen Einrichtungen, die die Rohrluppe bzw. das Rohr bei jedem Gerüst um einen definierten Winkel drehen und um einen ebenfalls definierten Betrag in Walzrichtung vorwärtsschieben. Die Vorschubbewegung wird im allgemeinen mittels in Rohrluppenlängsachsrichtung bewegter Schlitten bewirkt, die entweder die Rohrluppe von hinten schieben oder von außen klemmen. Im letzteren Fall ist die Klemmvorrichtung mit einem Drehantrieb versehen, der das Rohr gleichzeitig mit der Vorwärtsbewegung um seine Längsachse dreht.Cold pilger mills with a reciprocating mill stand are required Devices that define the tube blank or tube by a defined amount for each scaffold Rotate the angle and by a defined amount in the rolling direction forward push. The feed movement is generally in Rohrluppenlängsachsrichtung moving carriage causes either the Rohrluppe push from behind or clamp from the outside. In the latter case it is Clamping device with a rotary drive, which simultaneously the pipe with the Forward movement rotates about its longitudinal axis.
In anderen Ausführungen werden Drehung und Vorschub über einen ortsfesten Drehvorschubkopf mit umlaufenden Ketten bewirkt, wobei die Kettenglieder die Rohrluppe umschließen und mittels Reibung in Walzrichtung transportieren. Der Drehvorschubkopf ist über ein Planetengetriebe drehangetrieben und bewirkt somit die simultane Drehung der Rohrluppe. In other versions, rotation and feed are fixed over a stationary one Rotary feed head with rotating chains causes, the chain links the Enclose the tube blank and transport it in the rolling direction using friction. The Rotary feed head is driven by a planetary gear and thus causes simultaneous rotation of the tube blank.
In den meisten Fällen ist es erforderlich, die Rohrluppe nur in den Zeitphasen zu drehen und vorzuschieben, wenn die Walzen die Rohrluppe in den Totpunktbereichen des Walzgerüstes freigeben. Das heißt im allgemeinen, daß die Vorschub- und die Drehbewegungen einer stop and go-Funktion folgen. Da sich die Beschleunigungsvorgänge in Milli-Sekundenbereichen abspielen, werden hohe Anforderungen an die Antriebsmechanismen gestellt.In most cases it is necessary to close the tube blank only in the time phases rotate and advance when the rollers blow the tube blank in the dead center areas release the roll stand. This generally means that the feed and Follow rotary movements of a stop and go function. Since the Playing acceleration processes in millisecond ranges become high Requirements placed on the drive mechanisms.
Da bei den bekannten Kaltpilgerwalzwerken das Walzgut ausschließlich von den Vorschubeinrichtungen vorgeschoben wird, werden Druckkräfte und Spannungen zwischen Vorschubapparat und Umformzone wirksam. Hieraus ergibt sich grundsätzlich die Gefahr des Ausknickens des Walzgutes und der Domstange, insbesondere dann, wenn sich der Stoß zwischen zwei aufeinanderfolgenden Luppen oder Stangen zwischen Vorschubeinrichtung und dem Ende der Umformzone befindet. Bei dünnwandigen oder besonders kleinen Rohren oder Stangen kleinen Durchmessers ist es ein häufig beobachtetes Problem, daß sich die Luppen- bzw. Stangenenden durch die Druckbelastung ineinander verkeilen oder daß die Walzgutenden in der Umformzone ineinandergewalzt werden.Since in the known cold pilger rolling mills, the rolling stock exclusively from the Feed devices are pushed forward, compressive forces and tensions effective between feed device and forming zone. It follows from this basically the risk of buckling of the rolling stock and the dome bar, especially when there is an impact between two successive holes or rods between the feed device and the end of the forming zone. In the case of thin-walled or particularly small pipes or rods, small ones It is a frequently observed problem in diameter that the cap or Wedge rod ends into each other by the pressure load or that the Rolled ends are rolled into each other in the forming zone.
Aufgabe der vorliegenden Erfindung ist es, ausgehend von dem beschriebenen Stand der Technik ein Verfahren zum Kaltpilgem vorzuschlagen, mit dem extrem dünnwandige besonders kleinen Rohre oder Stangen kleinen Durchmessers gewalzt werden können, ohne daß die Gefahr des Ausknickens oder der Überwalzung auftritt.The object of the present invention is based on the described state to propose to the technology a method for cold mushrooms with the extreme thin-walled, especially small pipes or rods of small diameter are rolled can be without the risk of buckling or rolling.
Gelöst wird diese Aufgabe mit den Merkmalen des Patentanspruchs 1.This object is achieved with the features of
In Abkehr von der bisherigen Bauart, bei der das Walzgut von in Walzrichtung gesehen vor dem Walzgerüst angeordneten Vorschubeinrichtungen geschoben wird, sieht die Erfindung vor, das Walzgut auslaufseitig hinter dem Walzgerüst zu ergreifen und durch die Walzzone zu ziehen. Auf diese Weise werden die kritischen Druckund/oder Knickspannungen im Walzgut vermieden und damit auch die damit verursachten Störungen im Walzprozeß.In departure from the previous design, in which the rolling stock from in the rolling direction seen in front of the roll stand is pushed feed devices, The invention provides for the rolling stock to be taken on the outlet side behind the roll stand and pull through the rolling zone. In this way, the critical pressure and / or Buckling stresses are avoided in the rolling stock and thus also with it caused disturbances in the rolling process.
Dabei ist vorgesehen, daß der auslaufseitig angeordneten Transportvorrichtung ein einlaufseitig angeordneter Dreh- und Vorschubantrieb zugeordnet ist, der zumindest zeitweise den Vorschub und die Drehung des gepilgerten Walzgutes übernimmt und dessen Bewegungsablauf auf den Bewegungsablauf der auslaufseitigen Transportvorrichtung abgestimmt ist.It is provided that the transport device arranged on the outlet side is assigned to the inlet-side rotary and feed drive, at least temporarily takes over the feed and rotation of the piled rolling stock and its movement sequence on the movement sequence of the outlet side Transport device is coordinated.
In Zusammenwirkung der erfindungsgemäßen Transportvorrichtung mit herkömmlichen, vor dem Walzgerüst angeordneten Dreh-Vorschubantrieben und unter entsprechender Abstimmung der Einrichtungen kann das Walzgut zunächst von der einlaufseitigen Vorrichtung in die Umformzone des Walzgerüstes geführt und angewalzt werden, wobei, nachdem der Anfang des gepilgerten Walzgutes die auslaufseitige Transportvorrichtung erreicht hat und dort an seinem Umfang erfaßt ist, der einlaufseitig angeordnete Dreh-Vorschubantrieb so geschaltet werden kann, daß nur die auslaufseitige Transportvorrichtung den Vorwärtstransport des Walzgutes übernimmt.In cooperation with the transport device according to the invention conventional rotary feed drives arranged in front of the roll stand and under Corresponding coordination of the facilities, the rolling stock can initially by inlet-side device in the forming zone of the roll stand and be rolled on, after the beginning of the piled rolling stock has reached the outlet-side transport device and is detected there on its circumference, the rotary feed drive arranged on the inlet side can be switched so that only the outlet-side transport device the forward transport of the rolling stock takes over.
Ferner ist vorgesehen, daß die auslaufseitig angeordnete Transporteinrichtung mit einer geringfügig gegenüber der Auslaufsgeschwindigkeit des gepilgerten Walzgutes aus dem Walzgerüst erhöhten Transportgeschwindigkeit betreibbar ist. Das bedeutet, daß stets eine Zugkraft auf das gepilgerte Walzgut ausgeübt wird, so daß mit Sicherheit die kritischen Druck- und/oder Knickspannungen im Walzgut vermieden werden. Desweiteren kann von außen auf das Walzgut aufgebrachte Zugspannung das Umformvermögen des Walzgutes erhöhen.It is further provided that the transport device arranged on the outlet side also includes a little compared to the outlet speed of the piled rolling stock increased transport speed can be operated from the roll stand. That means, that a tensile force is always exerted on the piled rolling stock, so that with Safety avoided the critical compressive and / or buckling stresses in the rolling stock become. Furthermore, tensile stress can be applied to the rolling stock from the outside increase the formability of the rolling stock.
Nach einer Ausgestaltung des Verfahrens ist vorgesehen, daß der einlaufseitige Dreh-und
Vorschubantrieb unabhängig von der auslaufseitigen Transporteinrichtung zu- und
abschaltbar ist, so können damit die verschiedenen Zustände während des Walzens
erfaßt werden. Beim Anwalzen des Walzgutes ist es lediglich erforderlich, die
einlaufseitige Dreh- und Vorschubeinrichtung zu betreiben. In dem Moment, wo das
gepilgerte Walzgut das Walzgerüst verlassen hat und in die auslaufseitige
Transporteinrichtung eingeführt wurde, kann diese den Vorwärtstransport des
Walzgutes übernehmen, so daß der einlaufseitige Dreh-Vorschubantrieb abgeschaltet
werden kann. In anderen Betriebszuständen ist es denkbar, sowohl den Dreh-Vorschubantrieb
als auch die auslaufseitige Transporteinrichtung gemeinsam zu
schalten, wobei die im Patentanspruch 1 aufgezeigte Abstimmung der Antriebe
einzuhalten ist. According to an embodiment of the method, it is provided that the turning and
Feed drive independent of the outlet-side transport device
can be switched off, so that the different states during rolling
be recorded. When rolling the rolling stock, it is only necessary that
to operate the inlet-side rotating and feeding device. The moment that
piled rolling stock has left the roll stand and into the outlet side
Transport device was introduced, the forward transport of the
Take over the rolling stock so that the inlet-side rotary feed drive is switched off
can be. In other operating states, it is conceivable both the rotary feed drive
as well as the outlet-side transport device together
switch, the tuning of the drives shown in
Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß mindestens die auslaufseitige Transporteinrichtung als ortsfester Dreh-Vorschubkopf mit umlaufenden Ketten ausgebildet ist, dessen Kettenglieder die Rohrluppe umschließen und mittels Reibung in Walzrichtung transportieren. Derartige Vorrichtungen sind an sich bekannt; sie werden bisher als Dreh-Vorschubantrieb vor dem Walzgerüst eingesetzt und können das Einlaufspannfutter herkömmlicher Kaltpilgerwalzwerke ersetzen.According to a further embodiment of the invention it is provided that at least the discharge-side transport device as a fixed rotary feed head with rotating Chains is formed, the chain links enclose the tube blank and by means of Transport friction in the rolling direction. Such devices are known per se; So far they have been used as a rotary feed drive in front of the roll stand can replace the inlet chuck of conventional cold pilger rolling mills.
Bei Verwendung von jeweils gleichartigen, vor und hinter dem Walzgerüst angeordneten Dreh-Vorschubköpfen mit umlaufenden Ketten kann das Ein- und Auslaufspannfutter entfallen. Durch einen derartigen Antrieb lassen sich die Vorteile der Erfindung besonders günstig verwirklichen.When using the same type, in front of and behind the roll stand arranged rotary feed heads with rotating chains can be the in and Outlet chucks are not required. The advantages can be achieved by such a drive realize the invention particularly cheap.
Um das Einfädeln des Walzgutes zu erleichtern ist ferner vorgesehen, daß der Walzgutanfang mit einer dem Fertigdurchmesser des gepilgerten Walzgutes entsprechenden Durchmesserverjüngung versehen wird, die von der Einlaufseite ausgehend durch das Walzgerüst hindurch in die Transporteinrichtung eingeschoben wird. Ein solches Einfädelverfahren wird vor allem dann erforderlich, wenn lediglich eine auslaufseitige Transportvorrichtung mit den erfindungsgemäßen Merkmalen verwendet wird. Dieser Fall ist anwendbar, wenn sehr lange oder quasi endlos lange Stangen oder Luppen gewalzt werden sollen. In diesem Fall muß das Walzgut nur einmal in die auslaufseitige Transportvorrichtung eingeführt werden und kann dann nahezu endlos vorwärtstransportiert und dabei durch die Umformzone "gezogen" werden.In order to facilitate the threading of the rolling stock, it is also provided that the Rolling stock beginning with the finished diameter of the piled rolling stock appropriate diameter taper is provided from the inlet side inserted through the roll stand into the transport device becomes. Such a threading procedure is particularly necessary if only an outlet-side transport device with the features of the invention is used. This case is applicable if it is very long or almost endlessly long Poles or slabs are to be rolled. In this case, the rolling stock only has to once in the outlet-side transport device and can then transported almost endlessly and thereby "pulled" through the forming zone become.
Die Durchmesserverjüngung zum Einfädeln des Walzgutes kann beispielsweise durch Ziehen des Walzgutanfanges in einer Ziehvorrichtung hergestellt werden; es sind auch Vorrichtungen denkbar, wie sie zum Anformen von Ziehangeln vor Ziehmaschinen bekannt sind.The narrowing of the diameter for threading the rolling stock can be achieved, for example, by Pulling the beginning of the rolling stock can be produced in a pulling device; they are too Devices conceivable, such as those used to form drawing bars in front of drawing machines are known.
Nach einem anderen Merkmal der Erfindung kann die Durchmesserverjüngung auch von einer Stange gebildet werden, die koaxial am vorderen Ende des Walzgutes befestigt wird.According to another feature of the invention, the diameter taper can also are formed by a rod which is coaxial at the front end of the rolling stock is attached.
Um bei Verwendung von einlaufseitigen Dreh-Vorschubantrieben und auslaufseitiger Transportvorrichtung die notwendige Abstimmung der beiden Vorrichtungen eigenen Transportgeschwindigkeiten vornehmen zu können, ist im Übrigen vorgesehen, daß zunächst die Transportgeschwindigkeit des auslaufenden Walzgutes hinter dem Walzgerüst bei geöffneter auslaufseitiger Transportvorrichtung gemessen wird und das Ergebnis auf die Geschwindigkeitsregelung des Antriebes der Transportvorrichtung übertragen wird, wobei die Geschwindigkeit der auslaufseitig angeordneten Transportvorrichtung gegenüber der Transportgeschwindigkeit des einlaufseitigen Vorschubantriebes um 3 bis 10 % erhöht wird, bevor die Transportvorrichtung gegen das Walzgut geschlossen wird.In order to use rotary feed drives on the inlet side and on the outlet side Transport device own coordination of the two devices To be able to make transport speeds, it is also provided that first the transport speed of the rolling stock behind the Roll stand is measured with the transport device on the outlet side open and that Result on the speed control of the drive of the transport device is transmitted, the speed of which is arranged on the outlet side Transport device compared to the transport speed of the inlet side Feed drive is increased by 3 to 10% before the transport device against the rolling stock is closed.
Durch diese Vorgehensweise wird sichergestellt, daß die richtige Transportgeschwindigkeit der auslaufseitigen Transportvorrichtung eingestellt wird, die berücksichtigen muß, daß das Walzgut infolge der Verformung in der Umformzone eine Längsgeschwindigkeit erteilt bekommt, die abhängig ist vom Umformvorgang selbst. Diese aus der Umformung resultierende Transportgeschwindigkeit wird dann in der aufgezeigten Weise erhöht, so daß die zu vermeidenden Druck- und/oder Knickspannungen nicht eintreten können.This procedure ensures that the correct one Transport speed of the outlet-side transport device is set, the must take into account that the rolling stock due to the deformation in the forming zone is given a longitudinal speed which is dependent on the forming process itself. This transport speed resulting from the forming is then in the manner shown increases so that the pressure to be avoided and / or Buckling stresses cannot occur.
Die vorliegende Erfindung kann in vorteilhafter Weise sicherstellen, daß beim Walzen unmittelbar hintereinander eingeführter Luppen kein Verkeilen oder Ineinanderwalzen der Rohrenden auftritt; denn durch die Merkmale der Erfindung wird sichergestellt, daß zwischen zwei aufeinanderfolgenden Luppen stets ein geringer Abstand eingehalten wird, z.B. 20 mm am Stoß zweier Luppen.The present invention can advantageously ensure that when rolling Blanks introduced immediately one after the other do not wedge or roll into each other the pipe ends appear; because the features of the invention ensure that Always keep a small distance between two successive holes e.g. 20 mm at the joint of two loops.
Mit den Merkmalen und Maßnahmen der Erfindung können sehr dünnwandige Rohre mit einem Wanddicken-zu-Durchmesser-Verhältnis < 1 : 40 kaltgepilgert werden, was bislang nicht oder nur schwer möglich war. Die Erfindung erhöht die Prozeßsicherheit des Kaltpilgerverfahrens und vermeidet Störungen. Auch kürzere Rohrstücke sind nach der Erfindung verbessert walzbar. Die Erfindung ist gleichermaßen für Rohre wie auch für Drähte und kleine Profile anwendbar.With the features and measures of the invention, very thin-walled tubes can with a wall thickness-to-diameter ratio of <1:40, which is has not been possible so far or has been difficult The invention increases process reliability of the cold pilgrimage process and avoids interference. There are also shorter pipe sections improved rollable according to the invention. The invention is equally for pipes like also applicable for wires and small profiles.
Ein Ausführungsbeispiel der Erfindung ist in der einzigen Zeichnung dargestellt und wird nachfolgend beschrieben. An embodiment of the invention is shown in the single drawing and is described below.
Die Zeichnungsfigur zeigt ein Kaltpilgerwalzgerüst 1, das sich, wie der Doppelpfeil
über dem Kaltpilgerwalzgerüst andeutet, oszillierend hin- und herbewegt. Die
Oszillationsbewegung des Kaltpilgerwalzgerüst 1 wird von einem darunter liegenden,
(nicht dargestellten) Kurbeltrieb erzeugt. Das Walzenpaar 2 dreht sich synchron mit
der Bewegung des Walzgerüstes 1, getrieben von Ritzeln auf den Walzenachsen, die
mit ortsfesten Zahnstangen korrespondieren.The drawing figure shows a
Die Walzen sind so kalibriert, daß das Walzgut in den beiden Gerüsttotpunkten
jeweils freigegeben wird. Zu diesen Freigabezonen schiebt der Dreh- und
Vorschubantrieb 3 die mit 6 bezeichnete Luppe in Pfeilrichtung 7 vorwärts und dreht
sie gleichzeitig um einen vorgegebenen Winkelbetrag. Ist die Luppe soweit
ausgewalzt, daß das das Walzgerüst 1 verlassende gepilgerte Rohr auch von der
auslaufseitigen Transportvorrichtung 4 erfaßt und gedreht und gezogen werden kann,
so wird von dieser die Dreh- und Vorschubbewegung unterstützt. Bei der
Längstransportbewegung der auslaufseitigen Transportvorrichtung ist der
Streckungsverlauf des Walzgutes während des Walzens zu berücksichtigen. Die
nachfolgende zweite Luppe 5 wird mit einem Abstand von ca. 20 mm in die Dreh-Vorschubeinrichtung
3 eingelegt, so daß die Enden einander folgender Rohre sich
nicht berühren, auch nicht im Reduktionsbereich. Sobald ein Ende des gewalzten
Rohres die Umformzone im Walzgerüst 1 erreicht hat, wird durch die erhöhte
Transportgeschwindigkeit der auslaufseitigen Transportvorrichtung das Rohr schnell
abgezogen, so daß keine Berührung mit dem Anfang des nachfolgenden Rohres
stattfinden kann.The rollers are calibrated so that the rolling stock is in the two dead spots of the stand
is released in each case. The rotary and pushes to these release
Claims (6)
- Process for the cold pilger rolling in particular of tubes with extremely thin walls and bars with small diameters in a cold pilger rolling mill with rolls (2) arranged in a rolling stand (1) that moves back and forth, which are calibrated with a taper at their circumference, in which the material (5) to be rolled is rotated and transported forwards at least at one of the two rolling stand dead points, such that to rotate the rolled material and transport it forwards a transport mechanism (4) is provided on the run-out side arranged immediately behind the rolling stand (1), which grips the pilger-rolled material (5) at its circumference, the said transport mechanism (4) arranged on the run-out side being associated with a rotation and feed drive unit (3) arranged on the run-in side which, at least at times, takes over the feeding and rotation of the pilger-rolled material and whose movement sequence is matched to the movement sequence of the transport mechanism (4) on the run-out side, such that to adjust the transport speed of the transport mechanism arranged on the run-out side the transport speed of the emerging rolled material behind the rolling stand (1) is first measured while the transport mechanism (4) on the run-out side is open and the result is transmitted to the speed regulation system of the drive of the transport mechanism, so that the speed of the transport mechanism (4) arranged on the run-out side is made 3% to 10% higher compared with the transport speed of the feed drive (3) on the run-in side, before the transport mechanism is closed onto the rolled material.
- Process according to Claim 1,
characterised in that
the rotation and feed drive (3) on the run-in side can be switched on and off independently of the transport mechanism (4) on the run-out side. - Process according to Claim 1,
characterised in that
at least the transport mechanism (4) on the run-out side is formed as a rotation and feeding head in a fixed position with revolving chains, whose chain segments enclose the rolled material (blooms 5 and 6) and transport it in the rolling direction by friction. - Process according to any of the preceding claims,
characterised in that
the leading end of the material to be rolled is provided with a diameter taper corresponding to the finished diameter of the pilger-rolled material, which is pushed from the run-in side through the roller stand into the transport mechanism. - Process according to Claim 4,
characterised in that
the diameter taper is produced by drawing the leading end of the material to be rolled in a drawing device. - Process according to Claim 4,
characterised in that
the diameter taper is formed by a bar attached coaxially to the leading end of the material to be rolled.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19654489 | 1996-12-17 | ||
DE19654489 | 1996-12-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0849010A1 EP0849010A1 (en) | 1998-06-24 |
EP0849010B1 true EP0849010B1 (en) | 2002-04-17 |
Family
ID=7816299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97250369A Expired - Lifetime EP0849010B1 (en) | 1996-12-17 | 1997-12-10 | Method and device for cold rolling tubes and bars |
Country Status (4)
Country | Link |
---|---|
US (1) | US5921128A (en) |
EP (1) | EP0849010B1 (en) |
DE (1) | DE59707038D1 (en) |
RU (1) | RU2210444C2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19860710A1 (en) * | 1998-12-23 | 2000-06-29 | Sms Demag Ag | Process for controlling a hydraulic rotary and feed drive for a cold pilger rolling mill |
DE10105827B4 (en) * | 2001-02-07 | 2005-11-03 | "Alwag" Tunnelausbau Gesellschaft Mbh | Device for chipless forming of elongate workpieces |
DE10248136B3 (en) * | 2002-10-12 | 2004-05-06 | Sms Meer Gmbh | Making extended metal pipe filled with pressurized flowing mass, fills body before feeding into pilgering mill without internal tool |
US9016178B2 (en) * | 2010-01-12 | 2015-04-28 | Lewis W. Wadsworth | Apparatus and method for cutting tubular members |
RU2545935C2 (en) * | 2013-04-15 | 2015-04-10 | Открытое акционерное общество "Челябинский трубопрокатный завод" | Plant for production of tapered long-sized hollow metal parts |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE700857C (en) | 1937-03-31 | 1941-01-02 | Kronprinz Akt Ges Fuer Metalli | Device for bringing about the gradual feed in pilger mills |
DE843535C (en) * | 1951-04-21 | 1952-07-10 | Westdeutsche Mannesmannroehren | Device for sharpening hollow blocks |
US3668916A (en) * | 1970-01-19 | 1972-06-13 | Wean Ind Inc | Drawing of metal tubing |
PL87519B1 (en) * | 1973-05-30 | 1976-07-31 | ||
SU863025A1 (en) * | 1977-06-20 | 1981-09-15 | За витель Юшкевич и Л.И. Фил чкин-а | Method of cold rolling of tubes |
SU778834A1 (en) * | 1978-11-14 | 1980-11-15 | Уральский научно-исследовательский институт трубной промышленности | Method of preparing sleeve for tube pilger rolling |
JPS6384704A (en) * | 1986-09-29 | 1988-04-15 | Manabu Kiuchi | Method and apparatus for cold pilger rolling |
US4819471A (en) * | 1986-10-31 | 1989-04-11 | Westinghouse Electric Corp. | Pilger die for tubing production |
DE3709008C1 (en) * | 1987-03-19 | 1988-02-25 | Mannesmann Ag | Rotary and feed device for batchwise rolling of elongated workpieces on a cold pilger rolling mill |
DE3717165C1 (en) * | 1987-03-26 | 1988-03-31 | Mannesmann Ag | Method for the production of tubes by the cold reciprocating rolling method |
ES2111225T3 (en) * | 1993-09-29 | 1998-03-01 | Danieli Off Mecc | RODS STRETCHING MACHINE. |
DE19609291C2 (en) * | 1995-03-09 | 2003-06-12 | Walter Wolf | Process for rolling pipes or bars |
-
1997
- 1997-12-02 US US08/982,489 patent/US5921128A/en not_active Expired - Lifetime
- 1997-12-10 DE DE59707038T patent/DE59707038D1/en not_active Expired - Lifetime
- 1997-12-10 EP EP97250369A patent/EP0849010B1/en not_active Expired - Lifetime
- 1997-12-16 RU RU97120967/02A patent/RU2210444C2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE59707038D1 (en) | 2002-05-23 |
RU2210444C2 (en) | 2003-08-20 |
US5921128A (en) | 1999-07-13 |
EP0849010A1 (en) | 1998-06-24 |
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