EP0314935B1 - Hot rolling of rods having helicoidal ribs - Google Patents
Hot rolling of rods having helicoidal ribs Download PDFInfo
- Publication number
- EP0314935B1 EP0314935B1 EP88116615A EP88116615A EP0314935B1 EP 0314935 B1 EP0314935 B1 EP 0314935B1 EP 88116615 A EP88116615 A EP 88116615A EP 88116615 A EP88116615 A EP 88116615A EP 0314935 B1 EP0314935 B1 EP 0314935B1
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- EP
- European Patent Office
- Prior art keywords
- ribs
- rod
- rollers
- produced
- steel rod
- 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.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/04—Roll speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
Definitions
- the invention relates to a method for producing a hot-rolled steel bar, in particular a concrete reinforcement bar, according to the preamble of patent claim 1.
- steel bars are known as concrete reinforcement bars, in particular as tension bars, in which these ribs lie on two opposite sides of the bar circumference and each extend only over part of the bar circumference (DE-PS 17 84 630).
- Such steel bars can be rolled in the course of a normal warm rolling process in the last roll pass by a pair of duo rolls if precautions are taken to be able to adjust one of the rolls by rotating about its axis relative to the other roll so that certain points of its circumference correspond to the corresponding one
- the circumference of the opposing roller can be precisely assigned to one another in terms of position and if the rollers are driven at the same peripheral speed. In this way it can be achieved that the ribs produced on opposite sides of the steel rod lie on a continuous helix and thus form a screwable thread.
- Such steel bars can be used both as concrete reinforcement bars if the shape and dimensions of the ribs with regard to the composite properties of the requirements correspond to a concrete rib steel, as well as prestressing rods for prestressed concrete, as anchor rods for ground and rock anchors, as formwork anchors or the like, because anchoring bodies can be screwed onto the partial thread formed by the ribs at any point.
- anchoring or connecting bodies to be screwed on must have a greater length in order to transmit a certain rod force than would be the case with a rod with a continuous, uninterrupted thread.
- a steel rod provided with a continuous thread is already known and is also provided for the reinforcement of concrete (DE-GM 1 905 704).
- the thread is produced on conventional thread rolling machines; these are so-called transverse rolling mills made of two correspondingly profiled rolls that rotate in the same sense.
- the steel rod is located between these rollers and rolls around their circumference, whereby in addition to the deformation, it undergoes an opposite rotational movement and a feed in the sense of screwing it forward.
- this process is very time-consuming, it has the disadvantage that it cannot be carried out continuously, especially not immediately after hot rolling, because the steel rod has to perform a rotary movement in order to produce the thread.
- the object of the invention is to create a possibility for producing a steel rod, in particular a concrete reinforcement rod, in a machining step immediately following the hot rolling process, the ribs of which have an uninterrupted screwable thread form.
- a steel rod 1 produced according to the invention is shown in side view and in Fig. 2 in cross section along the line II-II in Fig. 1.
- the steel rod 1 has an approximately circular core cross section and is provided on its surface with ribs 2 which form a continuous, uninterrupted thread over the entire length of the rod.
- the ribs 2 have an approximately trapezoidal cross section with oblique flanks 3; however, any thread cross-sections are conceivable in an analogous manner.
- the steel rod 1 is produced in a warm rolling process, expediently directly from the rolling heat, the last two roll stands of a rolling train forming a unit which is shown schematically in FIG. 3.
- the rolling stand unit according to the invention consists of two with comparatively little clearance Distance, e.g. 0.30 m, arranged from each other duo-roller pairs A and B of two rollers I and II or III and IV, which are arranged pivoted by 90 degrees to the rod axis S (Fig. 3).
- Both the rollers I and II, which act laterally on the rod 1 with vertical nip, and the rollers III and IV, which act on the rod 1 at the top and bottom with a horizontal nip, are provided with profiles 4 and 5, at least over part of their length, each of which has the negative correspond to the ribs 2 to be produced on the rod 1.
- rollers I / II and III / IV of the roller pairs A and B are connected to one another in a movement-locking manner; this can happen, for example, in that the rollers I, II and III, IV are driven by a common gear unit acting on all rollers, as it were by a quattro gear, or also in that different drives are electronically connected to each other.
- the rollers are driven synchronously to achieve the same peripheral speeds, ie with the same roller diameters at the same speed; the direction of rotation of the individual rollers is indicated by arrows 6 and 7, respectively. This ensures that a speed ratio that has been set remains constant, ie that when the speed of one pair of rollers changes, the speed of the other pair of rollers must change accordingly.
- roller pair B downstream in the feed direction according to arrow 8 has, compared to the roller pair A, in addition to the advance caused by the elongation of the rod 1 in the roll stand A, a further small advance which is between the roller pairs A and B generates a tensile force in rod 1.
- one of the rollers I or II or III or IV must be adjustable in the direction of rotation relative to the other roller in such a way that certain locations on the circumference of one of the rollers positionally correspond to the corresponding locations on the circumference of the other roller can be assigned. This adjustability is necessary in order to ensure that the partial regions of the threaded ribs 1 which are respectively produced by a pair of rollers lie on a continuous helical line.
- a corresponding adjustability is required under the roller pairs A and B, namely in such a way that both rollers of one of the roller pairs, without changing their position relative to one another, can be adjusted relative to the other roller pair in such a way that the two partial regions of the thread ribs produced by these rollers open are located on the same helix as the partial areas generated by the two previous rollers.
- This possibility is of course also given if, for example, one of the four rollers is fixed and the remaining three rollers are adjustable with respect to this one roller.
- Fig. 4 shows a schematic side view again along a feed path in the direction of arrow 8, the two successive roller pairs A and B with the rollers I / II and III / IV.
- the steel rod 1 Before the pair of rollers A, the steel rod 1 shows an approximately circular cross section 1 ', which is of course only indicated as an example. Between the pairs of rollers A and B, the steel rod 1 has an approximately oval cross section 1 ⁇ with ribs 2 'produced on two opposite sides by the profiles 4 of the rollers I / II. After passing through the roller pair B there are also the upper and lower rib regions 2 viteen generated by the profiles 5 of the rollers III / IV, as a result of which the steel rod 1 in the final state again has an essentially circular shape with continuous threaded ribs 2.
- the spacing of the ribs in the individual machining stages must be exactly matched to one another and to the elongation of the rod occurring there due to the reduction in cross section.
- the fin spacing b corresponds to that given by the Roll pair A produced rib spacing a plus the extension of the rod 1 as a result of the reduction in cross section achieved in this roll stand.
- the rib spacing generated by the pair of rollers B must correspond to the rib spacing b; both are caused by the stretching occurring in this roll stand to the distance c forming the pitch s of the thread in the finished product.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Reinforcement Elements For Buildings (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines warmgewalzten Stahlstabes, insbesondere eines Betonbewehrungsstabes, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing a hot-rolled steel bar, in particular a concrete reinforcement bar, according to the preamble of patent claim 1.
Aufbauend auf dem grundlegenden Gedanken, die bei einem warmgewalzten Betonrippenstahl zur Verbesserung der Verbundwirkung im Beton auf dessen Oberfläche vorgesehenen Rippen auf einer Schraubenlinie anzuordnen, so daß sie ein Teilgewinde bilden, auf das ein mit einem entsprechenden Innengewinde versehener Verankerungs- oder Verbindungskörper aufgeschraubt werden kann, sind als Betonbewehrungsstäbe, insbesondere als Spannstäbe geeignete Stahlstäbe bekannt, bei denen diese Rippen auf zwei einander gegenüberliegenden Seiten des Stabumfanges liegen und sich jeweils nur über einen Teil des Stabumfanges erstrecken (DE-PS 17 84 630).Building on the basic idea of arranging the ribs provided on a hot-rolled ribbed steel to improve the bonding effect in the concrete on its surface on a screw line, so that they form a partial thread onto which an anchoring or connecting body provided with a corresponding internal thread can be screwed, steel bars are known as concrete reinforcement bars, in particular as tension bars, in which these ribs lie on two opposite sides of the bar circumference and each extend only over part of the bar circumference (DE-PS 17 84 630).
Solche Stahlstäbe können im Zuge eines normalen warmen Walzvorganges im letzten Walzenstich durch ein Duo-Walzenpaar gewalzt werden, wenn Vorkehrungen getroffen werden, um eine der Walzen durch Verdrehen um ihre Achse gegenüber der anderen Walze so verstellen zu können, daß bestimmte Stellen ihres Umfangs den entsprechenden Stellen des Umfangs der gegenüberliegenden Walze lagemäßig einander genau zugeordnet werden können und wenn die Walzen mit gleicher Umfangsgeschwindigkeit angetrieben werden. Auf diese Weise läßt sich erreichen, daß die auf einander gegenüberliegenden Seiten des Stahlstabes erzeugten Rippen auf einer durchgehenden Schraubenlinie liegen und so ein schraubbares Gewinde bilden.Such steel bars can be rolled in the course of a normal warm rolling process in the last roll pass by a pair of duo rolls if precautions are taken to be able to adjust one of the rolls by rotating about its axis relative to the other roll so that certain points of its circumference correspond to the corresponding one The circumference of the opposing roller can be precisely assigned to one another in terms of position and if the rollers are driven at the same peripheral speed. In this way it can be achieved that the ribs produced on opposite sides of the steel rod lie on a continuous helix and thus form a screwable thread.
Derartige Stahlstäbe können sowohl als Betonbewehrungsstäbe verwendet werden, wenn Form und Abmessungen der Rippen hinsichtlich der Verbundeigenschaften den Anforderungen an einen Betonrippenstahl entsprechen, wie auch als Spannstäbe für Spannbeton, als Ankerstäbe für Erd- und Felsanker, als Schalungsanker oder dergleichen, weil auf das durch die Rippen gebildete Teilgewinde an beliebigen Stellen Verankerungskörper aufgeschraubt werden können. Sie haben allerdings den Nachteil, daß die aufzuschraubenden Verankerungs- oder Verbindungskörper zur Übertragung einer bestimmten Stabkraft eine größere Länge aufweisen müssen als dies bei einem Stab mit einem durchgehenden, ununterbrochenen Gewinde der Fall wäre.Such steel bars can be used both as concrete reinforcement bars if the shape and dimensions of the ribs with regard to the composite properties of the requirements correspond to a concrete rib steel, as well as prestressing rods for prestressed concrete, as anchor rods for ground and rock anchors, as formwork anchors or the like, because anchoring bodies can be screwed onto the partial thread formed by the ribs at any point. However, they have the disadvantage that the anchoring or connecting bodies to be screwed on must have a greater length in order to transmit a certain rod force than would be the case with a rod with a continuous, uninterrupted thread.
Es ist zwar schon ein mit einem durchgehenden Gewinde versehener Stahlstab bekannt, der auch zur Bewehrung von Beton vorgesehen ist (DE-GM 1 905 704). Bei diesem Stahlstab wird das Gewinde auf herkömmlichen Gewindewalzmaschinen erzeugt; es sind dies sogenannte Querwalzwerke aus zwei entsprechend profilierten Walzen, die sich in gleichem Sinne drehen. Der Stahlstab befindet sich zwischen diesen Walzen und wälzt sich an deren Umfang ab, wobei er neben der Verformung eine gegensinnige Drehbewegung und einen Vorschub im Sinne eines Vorschraubens erfährt. Abgesehen davon, daß dieses Verfahren sehr zeitraubend ist, hat es den Nachteil, daß es nicht kontinuierlich, insbesondere nicht im unmittelbaren Anschluß an eine Warmwalzung durchgeführt werden kann, weil der Stahlstab zur Erzeugung des Gewindes eine Drehbewegung ausführen muß.A steel rod provided with a continuous thread is already known and is also provided for the reinforcement of concrete (DE-GM 1 905 704). With this steel rod, the thread is produced on conventional thread rolling machines; these are so-called transverse rolling mills made of two correspondingly profiled rolls that rotate in the same sense. The steel rod is located between these rollers and rolls around their circumference, whereby in addition to the deformation, it undergoes an opposite rotational movement and a feed in the sense of screwing it forward. Apart from the fact that this process is very time-consuming, it has the disadvantage that it cannot be carried out continuously, especially not immediately after hot rolling, because the steel rod has to perform a rotary movement in order to produce the thread.
Schließlich ist es zur Herstellung eines Stahlstabes mit einem ununterbrochenen Gewinde im Wege einer Warmwalzung schon vorgeschlagen worden, im letzten Walzgerüst vier jeweils unter 90 Grad zueinander geneigt am Stab angreifende Walzen zu verwenden, die mit jeweils Teilbereiche umlaufender Gewinderippen erzeugenden Vertiefungen versehen sein sollen (PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 147 (C-66), 5. Dezember 1979, S. 54 C 66 & JP-A 54-124861). Mit einer solchen Walzenanordnung läßt sich aber kein Bewehrungsstab mit durchgehend schraubbaren Rippen herstellen. Um solche Rippen walzen zu können, müssen die die Rippen bildenden Vertiefungen in den Walzen seitlich offen sein. Sind diese Vertiefungen aber seitlich offen, dann tritt bei der Verformung des Materials in dem betreffenden Walzenstich in den unvermeidlichen Walzenspalt zwischen den Einzelwalzen Material aus, das Längsrippen oder zumindest Grate bildet, welche die Schraubbarkeit der zu erzeugenden Gewinderippen verhindern. Mit der bekannten Walzenanordnung lassen sich also keine schraubbaren Rippen erzeugen.Finally, for the production of a steel rod with an uninterrupted thread by means of hot rolling, it has already been proposed to use four rollers, each inclined at 90 degrees to the rod, in the last roll stand, which are to be provided with depressions producing circumferential thread ribs (PATENT ABSTRACTS OF JAPAN, Vol. 3, No. 147 (C-66), December 5, 1979, p. 54 C 66 & JP-A 54-124861). With such a roller arrangement, however, nothing can be done Manufacture reinforcement bar with continuously screwable ribs. In order to be able to roll such ribs, the depressions forming the ribs in the rollers must be open on the side. However, if these recesses are open at the side, material that forms longitudinal ribs or at least burrs, which prevent the screwability of the thread ribs to be produced, emerges in the unavoidable roller gap between the individual rollers when the material in the relevant roll pass is deformed. With the known roller arrangement, no screwable ribs can be produced.
Vor diesem Hintergrund liegt, ausgehend vom Stand der Technik gemäß letztgenanntem Dokument, der Erfindung die Aufgabe zugrunde, eine Möglichkeit zu schaffen, um in einem unmittelbar an den Warmwalzvorgang anschließenden Bearbeitungsschritt einen Stahlstab, insbesondere einen Betonbewehrungsstab herstellen zu können, dessen Rippen ein ununterbrochenes schraubbares Gewinde bilden.Against this background, starting from the prior art according to the last-mentioned document, the object of the invention is to create a possibility for producing a steel rod, in particular a concrete reinforcement rod, in a machining step immediately following the hot rolling process, the ribs of which have an uninterrupted screwable thread form.
Gemäß der Erfindung wird diese Aufgabe durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of patent claim 1.
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous further developments result from the subclaims.
Die Herstellung eines Stahlstabes mit einem ununterbrochenen schraubbaren Gewinde gelingt nach der Erfindung dadurch, daß die Bearbeitungsschritte auf einander gegenüberliegenden Seiten um 90 Grad gegeneinander versetzt nacheinander und so erfolgen, daß der Stab nach dem ersten Bearbeitungsschritt eine etwa ovale Form erhält. Dadurch ist es möglich, im zweiten Bearbeitungsschritt die restlichen Rippenbereiche auszuformen. Da die Vertiefungen der Walzen des zweiten Bearbeitungsschritts genau die im ersten Bearbeitungsschritt erzeugten Rippen erfassen und abdecken, kann im Walzenspalt kein Material austreten.The production of a steel rod with an uninterrupted screwable thread succeeds according to the invention in that the processing steps on opposite sides are offset by 90 degrees in succession and so that the rod takes on an approximately oval shape after the first processing step. This makes it possible to shape the remaining rib areas in the second processing step. Since the indentations of the rollers of the second processing step exactly capture and cover the ribs generated in the first processing step, can in the nip no material leak.
Es ist zwar schon bekannt, bei der Warmwalzung von Stahlstäben in den letzten Walzstichen in aufeinanderfolgenden Arbeitsgängen auf jeweils einander gegenüberliegenden und um 90 Grad gegeneinander versetzten Seiten eines Stahlstabes Rippen anzubringen (DE-OS 23 37 313). Da dieser Stahlstab nur als Betonbewehrungsstab vorgesehen ist, dienen diese Rippen nur der Verbesserung des Verbundes im Beton, brauchen also nicht in einem bestimmten Maßverhältnis zueinander zu stehen. Sie können vielmehr grundsätzlich in beliebiger Weise zueinander angeordnet sein; es muß lediglich dafür gesorgt werden, daß durch die im zweiten Arbeitsgang am Stab angreifenden Walzen die im ersten Arbeitsgang erzeugten Rippen nicht beeinträchtigt werden. Zu diesem Zweck besitzen die Walzen des zweiten Arbeitsganges Ausnehmungen an den Stellen der im ersten Arbeitsgang erzeugten Rippen. Um der im ersten Arbeitsgang auftretenden Streckung des Stabes zwanglos folgen zu können, sind die Walzen des zweiten Arbeitsganges als Schleppwalzen ausgebildet, d.h. nicht angetrieben.It is already known to apply ribs during the hot rolling of steel bars in the last rolling passes in successive operations on sides of a steel bar that are opposite and offset by 90 degrees (DE-OS 23 37 313). Since this steel bar is only intended as a concrete reinforcement bar, these ribs only serve to improve the bond in the concrete, so they do not need to be in a certain dimensional relationship to one another. Rather, they can in principle be arranged with respect to one another in any way; it only has to be ensured that the ribs produced in the first step are not impaired by the rollers acting on the rod in the second step. For this purpose, the rollers of the second operation have recesses at the locations of the ribs produced in the first operation. In order to be able to follow the stretching of the rod in the first working step, the rollers of the second working step are designed as drag rollers, i.e. not powered.
Nach dem Verfahren gemäß der Erfindung gelingt nicht nur die Herstellung von mit einem durchgehenden, ununterbrochenen Gewinde versehenen Stahlstäben, sondern auch die Herstellung von Stahlstäben, deren auf einer durchgehenden Schraubenlinie liegende Rippen unterbrochen, beispielsweise so ausgebildet sind, daß auf diese Rippen sowohl Verankerungskörper mit Rechtsgewinde, wie auch solche mit Linksgewinde aufgeschraubt werden können.According to the method according to the invention, it is not only possible to produce steel rods provided with a continuous, uninterrupted thread, but also to produce steel rods whose ribs lying on a continuous helical line are interrupted, for example, so that both anchoring bodies with a right-hand thread are formed on these ribs , as well as those with left-hand threads can be screwed on.
Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Es zeigt
- Fig. 1
- eine Seitenansicht und
- Fig. 2
- einen Querschnitt eines erfindungsgemäß hergestellten Stahlstabes,
- Fig. 3
- eine schematische Schrägansicht einer aus zwei Duo-Walzenpaaren bestehenden Walzgerüsteinheit und
- Fig. 4
- ebenfalls schematisch in größerem Maßstab die einzelnen Verformungsschritte des herzustellenden Stahlstabes.
- Fig. 1
- a side view and
- Fig. 2
- a cross section of a steel rod produced according to the invention,
- Fig. 3
- is a schematic oblique view of a rolling stand unit consisting of two duo-roller pairs and
- Fig. 4
- also schematically on a larger scale the individual deformation steps of the steel rod to be produced.
In Fig. 1 ist ein erfindungsgemäß hergestellter Stahlstab 1 in Seitenansicht und in Fig. 2 im Querschnitt entlang der Linie II-II in Fig. 1 dargestellt. Der Stahlstab 1 hat etwa kreisförmigen Kernquerschnitt und ist an seiner Oberfläche mit Rippen 2 versehen, die über die gesamte Länge des Stabes ein durchgehendes, ununterbrochenes Gewinde bilden. In dem dargestellten Ausführungsbeispiel haben die Rippen 2 etwa trapezförmigen Querschnitt mit schrägen Flanken 3; es sind aber in analoger Weise beliebige Gewindequerschnitte denkbar.In Fig. 1, a steel rod 1 produced according to the invention is shown in side view and in Fig. 2 in cross section along the line II-II in Fig. 1. The steel rod 1 has an approximately circular core cross section and is provided on its surface with ribs 2 which form a continuous, uninterrupted thread over the entire length of the rod. In the illustrated embodiment, the ribs 2 have an approximately trapezoidal cross section with oblique flanks 3; however, any thread cross-sections are conceivable in an analogous manner.
Der Stahlstab 1 wird in einem warmen Walzvorgang, zweckmäßigerweise unmittelbar aus der Walzhitze heraus hergestellt, wobei die beiden letzten Walzgerüste einer Walzstraße eine Einheit bilden, die in Fig. 3 schematisch dargestellt ist.The steel rod 1 is produced in a warm rolling process, expediently directly from the rolling heat, the last two roll stands of a rolling train forming a unit which is shown schematically in FIG. 3.
Während entlang einer Walzstraße die einzelnen Walzgerüste üblicherweise größeren Abstand voneinander haben und der Walzstahl zwischen aufeinanderfolgenden Walzgerüsten abweichend von einer geraden Achse in Krümmungen geführt ist, um etwaige Drehzahlunterschiede der jeweils gesondert angetriebenen Walzgerüste auszugleichen, besteht die Walzgerüsteinheit nach der Erfindung aus zwei mit vergleichsweise geringem lichten Abstand, z.B. 0,30 m, voneinander angeordneten Duo-Walzenpaaren A und B aus jeweils zwei Walzen I und II bzw. III und IV, die um 90 Grad zur Stabachse S gegeneinander verschwenkt angeordnet sind (Fig. 3). Sowohl die mit vertikalem Walzspalt seitlich am Stab 1 angreifenden Walzen I und II, wie auch die mit horizontalem Walzspalt oben und unten am Stab 1 angreifenden Walzen III und IV sind zumindest über Teilbereiche ihrer Länge mit Profilierungen 4 bzw. 5 versehen, die jeweils dem Negativ der am Stab 1 zu erzeugenden Rippen 2 entsprechen.While the individual roll stands are usually at a greater distance from one another along a rolling mill and the rolled steel between successive roll stands deviates from a straight axis in order to compensate for any speed differences between the separately driven roll stands, the rolling stand unit according to the invention consists of two with comparatively little clearance Distance, e.g. 0.30 m, arranged from each other duo-roller pairs A and B of two rollers I and II or III and IV, which are arranged pivoted by 90 degrees to the rod axis S (Fig. 3). Both the rollers I and II, which act laterally on the rod 1 with vertical nip, and the rollers III and IV, which act on the rod 1 at the top and bottom with a horizontal nip, are provided with
Die Walzen I/II und III/IV der Walzenpaare A und B sind bewegungsschlüssig miteinander verbunden; dies kann z.B. dadurch geschehen, daß die Walzen I, II und III, IV durch eine gemeinsame, auf alle Walzen wirkende Getriebeeinheit, gleichsam durch ein Quattrogetriebe angetrieben werden, oder auch dadurch, daß unterschiedliche Antriebe elektronisch miteinander verbunden sind. Die Walzen werden zur Erreichung gleicher Umfangsgeschwindigkeiten synchron, d.h. bei gleichen Walzendurchmessern mit gleicher Drehzahl angetrieben; die Drehrichtung der einzelnen Walzen ist jeweils durch Pfeile 6 bzw. 7 angedeutet. Dadurch wird sichergestellt, daß ein einmal eingestelltes Drehzahlverhältnis konstant bleibt, d.h. daß, wenn sich die Drehzahl eines Walzenpaares ändert, sich die Drehzahl des anderen Walzenpaares entsprechend ändern muß. Es ist zweckmäßig, leicht auf Zug zu walzen, d.h. das in Vorschubrichtung gemäß Pfeil 8 nachgeordnete Walzenpaar B weist gegenüber dem Walzenpaar A neben dem durch die Streckung des Stabes 1 im Walzgerüst A bedingten Vorlauf einen weiteren geringen Vorlauf auf, der zwischen den Walzenpaaren A und B eine Zugkraft im Stab 1 erzeugt.The rollers I / II and III / IV of the roller pairs A and B are connected to one another in a movement-locking manner; this can happen, for example, in that the rollers I, II and III, IV are driven by a common gear unit acting on all rollers, as it were by a quattro gear, or also in that different drives are electronically connected to each other. The rollers are driven synchronously to achieve the same peripheral speeds, ie with the same roller diameters at the same speed; the direction of rotation of the individual rollers is indicated by arrows 6 and 7, respectively. This ensures that a speed ratio that has been set remains constant, ie that when the speed of one pair of rollers changes, the speed of the other pair of rollers must change accordingly. It is expedient to roll lightly on train, ie the roller pair B downstream in the feed direction according to arrow 8 has, compared to the roller pair A, in addition to the advance caused by the elongation of the rod 1 in the roll stand A, a further small advance which is between the roller pairs A and B generates a tensile force in rod 1.
In jedem der Walzenpaare A und B muß eine der Walzen I oder II bzw. III oder IV gegenüber der jeweils anderen Walze in Drehrichtung derart verstellbar sein, daß bestimmte Stellen auf dem Umfang einer der Walzen lagemäßig den entsprechenden Stellen auf dem Umfang der jeweils anderen Walze zugeordnet werden können. Diese Verstellbarkeit ist notwendig, um zu erreichen, daß die jeweils durch ein Walzenpaar erzeugten Teilbereiche der Gewinderippen 1 auf einer durchgehenden Schraubenlinie liegen. Eine entsprechende Verstellbarkeit ist unter den Walzenpaaren A und B erforderlich, nämlich derart, daß beide Walzen eines der Walzenpaare, ohne ihre Lage relativ zueinander zu verändern, gegenüber dem anderen Walzenpaar so verstellt werden können, daß die beiden durch diese Walzen erzeugten Teilbereiche der Gewinderippen auf derselben Schraubenlinie liegen wie die von den beiden vorhergehenden Walzen erzeugten Teilbereiche. Diese Möglichkeit ist selbstverständlich auch dann gegeben, wenn beispielsweise eine der vier Walzen fest und die übrigen drei Walzen bezüglich dieser einen Walze verstellbar sind.In each of the roller pairs A and B, one of the rollers I or II or III or IV must be adjustable in the direction of rotation relative to the other roller in such a way that certain locations on the circumference of one of the rollers positionally correspond to the corresponding locations on the circumference of the other roller can be assigned. This adjustability is necessary in order to ensure that the partial regions of the threaded ribs 1 which are respectively produced by a pair of rollers lie on a continuous helical line. A corresponding adjustability is required under the roller pairs A and B, namely in such a way that both rollers of one of the roller pairs, without changing their position relative to one another, can be adjusted relative to the other roller pair in such a way that the two partial regions of the thread ribs produced by these rollers open are located on the same helix as the partial areas generated by the two previous rollers. This possibility is of course also given if, for example, one of the four rollers is fixed and the remaining three rollers are adjustable with respect to this one roller.
Bei der Festlegung der Drehzahlen der beiden Walzenpaare A und B, insbesondere des - steuerbaren - Drehzahlverhältnisses zwischen dem Walzenpaar A aus den Walzen I und II sowie dem Walzenpaar B aus den Walzen III und IV, muß die Querschnittsverminderung des Stahlstabes 1 beim Durchgang durch den jeweiligen Walzenspalt berücksichtigt werden; diese Querschnittsverminderung bedingt im übrigen auch die Wahl der Rippenabstände in den einzelnen Bearbeitungsstufen, was anhand der Fig. 4 erläutert werden kann.When determining the speeds of the two pairs of rollers A and B, in particular the - controllable - speed ratio between the pair of rollers A from rollers I and II and the pair of rollers B from rollers III and IV, the cross-section reduction of the steel rod 1 during passage through the respective Roller gap are taken into account; this reduction in cross-section also requires the choice of the rib spacing in the individual processing stages, which can be explained with reference to FIG. 4.
Fig. 4 zeigt in einer schematischen Seitenansicht nochmals entlang einer Vorschubbahn in Richtung des Pfeils 8 die beiden aufeinanderfolgenden Walzenpaare A und B mit den Walzen I/II bzw. III/IV. Vor dem Walzenpaar A zeigt der Stahlstab 1 einen etwa kreisrunden Querschnitt 1′, der selbstverständlich nur beispielhaft angedeutet ist. Zwischen den Walzenpaaren A und B hat der Stahlstab 1 einen etwa ovalen Querschnitt 1˝ mit auf zwei einander gegenüberliegenden Seiten durch die Profilierungen 4 der Walzen I/II erzeugten Rippen 2′ . Zu diesen kommen nach Passieren des Walzenpaares B noch die durch die Profilierungen 5 der Walzen III/IV erzeugten oberen und unteren Rippenbereiche 2˝, wodurch der Stahlstab 1 im Endzustand wiederum eine im wesentlichen kreisrunde Form mit durchgehend umlaufenden Gewinderippen 2 erhält.Fig. 4 shows a schematic side view again along a feed path in the direction of arrow 8, the two successive roller pairs A and B with the rollers I / II and III / IV. Before the pair of rollers A, the steel rod 1 shows an approximately circular cross section 1 ', which is of course only indicated as an example. Between the pairs of rollers A and B, the steel rod 1 has an approximately oval cross section 1˝ with ribs 2 'produced on two opposite sides by the profiles 4 of the rollers I / II. After passing through the roller pair B there are also the upper and lower rib regions 2 erzeugten generated by the
Um im Endzustand des Stahlstabes 1 einen definierten, die Steigung s des Gewindes bestimmenden Abstand der Gewinderippen 2 zu erreichen, müssen die Abstände der Rippen in den einzelnen Bearbeitungsstufen exakt aufeinander und auf die dort auftretende Streckung des Stabes infolge der Querschnittsreduzierung abgestimmt sein. So entspricht der im Bearbeitungsstadium 1˝, also nach Verlassen des Walzenpaares A gegebene Rippenabstand b dem durch das Walzenpaar A erzeugten Rippenabstand a zuzüglich der Streckung des Stabes 1 infolge der in diesem Walzgerüst erzielten Querschnittsverringerung. Der durch das Walzenpaar B erzeugte Rippenabstand muß dem Rippenabstand b entsprechen; beide werden durch die in diesem Walzgerüst eintretende Streckung zu dem im Fertigprodukt die Steigung s des Gewindes bildenden Abstand c.In order to achieve a defined distance of the threaded ribs 2 determining the pitch s of the thread in the final state of the steel rod 1, the spacing of the ribs in the individual machining stages must be exactly matched to one another and to the elongation of the rod occurring there due to the reduction in cross section. Thus, in the processing stage 1˝, i.e. after leaving the roller pair A, the fin spacing b corresponds to that given by the Roll pair A produced rib spacing a plus the extension of the rod 1 as a result of the reduction in cross section achieved in this roll stand. The rib spacing generated by the pair of rollers B must correspond to the rib spacing b; both are caused by the stretching occurring in this roll stand to the distance c forming the pitch s of the thread in the finished product.
Claims (3)
- A method of producing a hot-rolled steel rod (1), in particular a concrete-reinforcing rod of approximately circular cross-section and having ribs (2) extending along a helix and forming at least portions of a screw thread, which ribs serve for the screwing-on of an anchoring or connecting member provided with a corresponding screw thread, characterised in that, to produce a continuous, uninterrupted screw thread (2) by hot rolling in a first processing stage, ribs (2') respectively extending only over a portion of the rod periphery are produced on opposite sides of the steel rod (1), whereupon the rod assumes an approximately oval cross-sectional shape (1''), and in that in a second, immediately succeeding processing stage the ribs (2'') extending over the intermediate regions of the rod periphery are produced.
- A method according to Claim 1, characterized in that the two processing stages immediately succeed the rolling of the steel rod, utilizing the rolling heat.
- A method according to Claim 1 or 2, characterised in that the spacing (a) of the ribs (2') produced in the first processing stage is smaller by the extent of the axial elongation of the steel rod than the spacing (b) of the ribs (2'') produced in the second processing stage, which again is smaller by the extent of the axial elongation than the spacing (c) of the ribs (2) in the final state of the rod.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3736942 | 1987-10-31 | ||
| DE19873736942 DE3736942A1 (en) | 1987-10-31 | 1987-10-31 | METHOD FOR PRODUCING A STEEL ROD WITH HOT-ROLLED, SCREW-LINE-SHAPED RIBS, AND DEVICE FOR CARRYING OUT THE METHOD |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0314935A2 EP0314935A2 (en) | 1989-05-10 |
| EP0314935A3 EP0314935A3 (en) | 1989-11-15 |
| EP0314935B1 true EP0314935B1 (en) | 1993-03-31 |
Family
ID=6339490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88116615A Expired - Lifetime EP0314935B1 (en) | 1987-10-31 | 1988-10-07 | Hot rolling of rods having helicoidal ribs |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4953379A (en) |
| EP (1) | EP0314935B1 (en) |
| JP (1) | JPH01148433A (en) |
| BR (1) | BR8805594A (en) |
| DE (2) | DE3736942A1 (en) |
| HU (1) | HU204456B (en) |
| ZA (1) | ZA887697B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6298705B1 (en) | 2000-01-26 | 2001-10-09 | Morgan Construction Company | Method and apparatus for rolling concrete reinforcing elements |
| AUPQ624600A0 (en) * | 2000-03-15 | 2000-04-06 | Gray, Evelyn Frances | Process for forming a threaded member |
| US6935997B2 (en) * | 2000-09-14 | 2005-08-30 | Rutgers, The State University Of New Jersey | Patterning technology for folded sheet structures |
| EP1219366A3 (en) * | 2000-12-27 | 2003-11-19 | Christian Hoffmann | Method for manufacturing a profile, especially a thread, on steel rods and installation and device therefor |
| US7624556B2 (en) | 2003-11-25 | 2009-12-01 | Bbv Vorspanntechnik Gmbh | Threaded deformed reinforcing bar and method for making the bar |
| WO2011163449A1 (en) * | 2010-06-24 | 2011-12-29 | Nucor Steel Birmingham, Inc. | A tensionable threaded rebar bolt |
| US9010165B2 (en) | 2011-01-18 | 2015-04-21 | Nucor Corporation | Threaded rebar manufacturing process and system |
| CN102179403B (en) * | 2011-03-23 | 2012-12-05 | 中冶赛迪工程技术股份有限公司 | Production device of high-strength fine-grain hot rolled ribbed steel bars and production process thereof |
| ITMI20110937A1 (en) * | 2011-05-25 | 2012-11-26 | Siemens Vai Metals Tech Srl | CAGE AND LAMINATION PLANT |
| JP5925548B2 (en) * | 2011-07-19 | 2016-05-25 | 濱中ナット株式会社 | Method for manufacturing screw rebar |
| CN102814322B (en) * | 2012-07-18 | 2015-11-25 | 重庆亨尔通冶金新技术股份有限公司 | A kind of roughing mill of steel bar meter |
| CN106269853A (en) * | 2016-08-16 | 2017-01-04 | 重庆市晟庄建材有限责任公司 | A kind of high ductility cold-rolled ribbed bars processing method |
| JP6147404B1 (en) * | 2016-10-13 | 2017-06-14 | 福田 清子 | Threaded bar joint of deformed bar and method for manufacturing the same |
| KR102435778B1 (en) | 2016-10-13 | 2022-08-23 | 아키라 후쿠다 | Threaded rebar joint structure of deformed rebar and its manufacturing method |
| CN108176713A (en) * | 2017-12-08 | 2018-06-19 | 山东钢铁股份有限公司 | A kind of hot rolling decorative pattern H profile steel, milling method and rolling equipment |
| US10260234B1 (en) * | 2017-12-22 | 2019-04-16 | Yu-Liang Kuo | Deformed reinforcing bar, truss structure, and floor module structure |
| US20220098099A1 (en) * | 2019-01-10 | 2022-03-31 | The Regents Of The University Of Michigan | Striated fiber-based concrete reinforcement |
| JP6682122B1 (en) * | 2019-08-01 | 2020-04-15 | 山田 榮子 | Manufacturing method of steel bar with continuous screw |
| CN112588820B (en) * | 2020-12-25 | 2022-10-28 | 首钢长治钢铁有限公司 | Production method of hot-rolled mining anchor rod steel |
| BE1029201B1 (en) * | 2021-03-16 | 2022-10-17 | Dubaere | ROLLER, ROLLING MACHINE AND PROCEDURE FOR COLD ROLLING FROM WIRE ROD TO COLD DRAWN WIRE WITH A PROFILE |
| CN113458141B (en) * | 2021-07-15 | 2022-05-27 | 首钢长治钢铁有限公司 | Finish rolling deformed steel bar rolling method |
| CN114054526A (en) * | 2021-11-10 | 2022-02-18 | 陕西鼎益科技有限公司 | MCR extrusion forming device for high-temperature alloy wire rod |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB132219A (en) * | 1900-01-01 | |||
| US116218A (en) * | 1871-06-20 | Improvement in machines for forming spiral grooves on metallic rods | ||
| US879444A (en) * | 1906-07-19 | 1908-02-18 | Edward F Crane | Metallic reinforcing structure for cementitious bodies. |
| US2089311A (en) * | 1933-12-18 | 1937-08-10 | Waterbury Farrel Foundry Co | Tandem mill |
| JPS4415538Y1 (en) * | 1966-03-14 | 1969-07-04 | ||
| JPS4532121Y1 (en) * | 1967-06-30 | 1970-12-09 | ||
| DE1784630C2 (en) * | 1968-08-29 | 1974-09-19 | Dyckerhoff & Widmann Ag, 8000 Muenchen | Concrete reinforcement bar, especially tie bar |
| DE1938120B2 (en) * | 1969-07-26 | 1973-12-20 | Iiseder Huette | Pair of rollers for the production of ribbed concrete reinforcement bars |
| DE2033759C3 (en) * | 1970-07-08 | 1980-08-21 | Wilhelm 8602 Schluesselfeld Schwarz | Concrete rebar |
| US3722249A (en) * | 1970-12-03 | 1973-03-27 | Stosha E Zhukevich | Device for rolling corrugated tubular parts |
| AT324268B (en) * | 1972-07-28 | 1975-08-25 | Oesterr Alpine Montan | METHOD AND DEVICE FOR HOT ROLLING BARS WITH PERIODIC RULES OR RECESSES AND BAR MANUFACTURED BY THE METHOD |
| DE2437684C2 (en) * | 1974-08-05 | 1982-09-02 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Rolling mill for the production of wire and ribbed steel |
| DE2704819C2 (en) * | 1977-02-05 | 1985-03-21 | Dyckerhoff & Widmann AG, 8000 München | Concrete reinforcing bar with helical ribs forming parts of a thread |
| JPS5412486A (en) * | 1977-06-30 | 1979-01-30 | Showa Electric Wire & Cable Co | Apparatus for making cable wire |
| JPS54124861A (en) * | 1978-03-22 | 1979-09-28 | Sumitomo Metal Ind Ltd | Production of special shape steel rod by four roll type rolling mill |
| DE2843245A1 (en) * | 1978-10-04 | 1980-04-10 | Walter Hoff | Universal formwork type screwed steel bar - has cylindrical base between helical elevations in cold rolled thread profiling |
| NZ214897A (en) * | 1985-01-25 | 1988-05-30 | Titan Mining & Eng | Rock bolt with thread formed on helical ridges |
| JPS62258040A (en) * | 1986-05-02 | 1987-11-10 | 住友電気工業株式会社 | Rod steel for concrete structure |
-
1987
- 1987-10-31 DE DE19873736942 patent/DE3736942A1/en not_active Ceased
-
1988
- 1988-10-07 EP EP88116615A patent/EP0314935B1/en not_active Expired - Lifetime
- 1988-10-07 DE DE8888116615T patent/DE3879869D1/en not_active Expired - Fee Related
- 1988-10-14 ZA ZA887697A patent/ZA887697B/en unknown
- 1988-10-24 JP JP63266279A patent/JPH01148433A/en active Pending
- 1988-10-25 US US07/262,454 patent/US4953379A/en not_active Expired - Lifetime
- 1988-10-27 BR BR8805594A patent/BR8805594A/en not_active Application Discontinuation
- 1988-10-28 HU HU885646A patent/HU204456B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3736942A1 (en) | 1989-05-11 |
| ZA887697B (en) | 1989-06-28 |
| US4953379A (en) | 1990-09-04 |
| HUT51516A (en) | 1990-05-28 |
| JPH01148433A (en) | 1989-06-09 |
| EP0314935A2 (en) | 1989-05-10 |
| DE3879869D1 (en) | 1993-05-06 |
| EP0314935A3 (en) | 1989-11-15 |
| BR8805594A (en) | 1989-06-20 |
| HU204456B (en) | 1992-01-28 |
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