EP0403916A1 - Method for production of ribbed reinforcing steel - Google Patents
Method for production of ribbed reinforcing steel Download PDFInfo
- Publication number
- EP0403916A1 EP0403916A1 EP90111026A EP90111026A EP0403916A1 EP 0403916 A1 EP0403916 A1 EP 0403916A1 EP 90111026 A EP90111026 A EP 90111026A EP 90111026 A EP90111026 A EP 90111026A EP 0403916 A1 EP0403916 A1 EP 0403916A1
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- Prior art keywords
- stretching
- steel wire
- elongation
- disks
- guided
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- B21C1/12—Regulating or controlling speed of drawing drums, e.g. to influence tension; Drives; Stop or relief mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F9/00—Straining wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F9/00—Straining wire
- B21F9/007—Straining wire to induce a plastic deformation of the wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
Definitions
- the invention relates to a method for producing ribbed reinforcing steel, wherein a steel wire is produced by hot rolling and is thereby provided with inclined ribs and optionally longitudinal ribs (in particular according to DIN 488), and wherein the steel wire which has been hot-ribbed in this way is subjected to cold stretching and thereby related is adjusted to the yield strength and the elongation. It is essential for this process that the rib-forming shape takes place during rolling and is a so-called hot rib. In contrast, stretching takes place as cold stretching. It goes without saying that the yield strength and the elongation are set so that the prescribed, standardized values are observed. - The invention further relates to a plant for performing such a method.
- the stretching results from a torsional deformation with the aid of a torsional machine which operates discontinuously.
- the discontinuous procedure interferes with the operational process.
- Relatively large, unavoidable tolerances must be permitted or taken into account for the yield strength to be set and for the stretching to be set.
- the values for the yield strength and the stretching over the length of a reinforcing steel are not very uniform in accordance with the different stretching sections which belong to the discontinuous procedure.
- the fatigue strength of the stretched concrete is often unsatisfactory. There is a risk of fatigue failure in the event of vibration stress. On the other hand, practice increasingly demands high values for the fatigue strength.
- the invention has for its object to carry out the method described above so that the yield strength and the elongation can be set very precisely and also other physical properties of the reinforcing steel, in particular its fatigue behavior, are improved.
- the invention is also based on the object of specifying a system with which the method according to the invention can be carried out in a particularly simple and reliable manner.
- the invention teaches that the steel wire is continuously stretched and, for this purpose, is guided over at least two driven stretching disks (or stretching rollers), which are under Different peripheral speeds work on the steel wire, that the degree of stretch is controlled via the difference in peripheral speed of the two stretching disks and that the yield strength and the elongation are controlled via the stretching speed.
- the invention is based on the knowledge that with a continuous linear stretching there is the possibility, for a given degree of stretching, of intervening to optimize the process in the sense that very precise values for the yield strength and the elongation can be specified and maintained. In addition to the stretching speed, the degree of stretching is still an influencing variable which can be varied.
- the reinforcing steel produced in this way is also characterized by a very high fatigue strength.
- the stretching speed should be selected so that the specified values for the yield point and the elongation are maintained, but the stretching speed should be selected as low as possible within this condition.
- - Degree of stretching denotes the elongation that the steel wire or a unit of length of the steel wire undergoes during stretching, in percent.
- Stretching speed denotes the permanent change in length of the steel wire or a unit of length of the steel wire in the area between the two stretching disks in the unit of time. According to the invention, both variables can be set and maintained by influencing the peripheral speeds of the stretching disks.
- the steel wire is guided over the stretching disks without slippage.
- This can be accomplished in several ways, e.g. B. by vulcanized rubber-elastic pads on the tread of the stretching discs, by form-fitting configurations that correspond to the ribs on the steel wires. This can also be achieved in other ways, possibly also by multiple wrapping of the stretching discs.
- it is always advantageous to guide the steel wire over the stretching discs without damaging the ribs. In this respect, too, rubber-elastic pads and adapted form-fitting designs have proven to be advantageous.
- the yield strength and the elongation can be set and maintained very precisely.
- a surprising reduction in the susceptibility to fatigue fracture is also achieved.
- the fatigue fractures often also start from microcracks in the surface area of the steel wires, which in turn are based on damage to the ribs or other defects.
- the formation of microcracks which are disruptive in this respect can largely be avoided by adjusting the stretching speed, but the yield strength and the elongation can nevertheless be controlled very precisely.
- the invention also relates to a plant which is particularly suitable for carrying out the method described.
- the stretching disks 1 or 2 have a radius of at least 500 mm. They can be driven via the motor / gear unit 3 or 4 with a predeterminable peripheral speed and a predeterminable peripheral speed difference.
- the steel wire 5 is guided around the two stretching discs 1 and 2 in an S-shape. It can be fed to the inlet stretching disk 1 with a tangential inlet section 6 and can be removed from the outlet stretching disk 2 with a tangential outlet section 7.
- the hot-ribbed steel wire 5 which was deposited with a permanent torsional deformation of 360 ° per turn via a winding layer out of the rolling heat, is drawn off from a beater 8 in the cold state with this twisting deformation.
- a recovery device 9 for this torsional deformation.
- the reshaping device 9 works with reshaping rollers 10. It goes without saying that the stretching disks 1 and 2 are designed such that they guide the steel wire 5 without slipping. The design is also made so that the ribs of the steel wire 5 on the stretching discs 1 and 2 and in the recovery device 9 are not damaged.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Wire Processing (AREA)
- Ropes Or Cables (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von geripptem Betonstahl, wobei ein Stahldraht durch Warmwalzen hergestellt und dabei mit Schrägrippen sowie ggf. Längsrippen (insbesondere nach DIN 488) versehen wird, und wobei der auf diese Weise warmgerippte Stahldraht kalt einer Reckung unterworfen sowie dadurch in bezug auf die Streckgrenze und die Dehnung eingestellt wird. Wesentlich für dieses Verfahren ist, daß die rippenbildende Formgebung beim Walzen erfolgt und eine sogenannte Warmrippung ist. Demgegenüber erfolgt die Reckung als Kaltreckung. Es versteht sich, daß io die Streckgrenze und die Dehnung so eingestellt werden, daß die vorgeschriebenen, normierten Werte eingehalten sind. - Die Erfindung betrifft fernerhin eine Anlage zur Durchführung eines solchen Verfahrens.The invention relates to a method for producing ribbed reinforcing steel, wherein a steel wire is produced by hot rolling and is thereby provided with inclined ribs and optionally longitudinal ribs (in particular according to DIN 488), and wherein the steel wire which has been hot-ribbed in this way is subjected to cold stretching and thereby related is adjusted to the yield strength and the elongation. It is essential for this process that the rib-forming shape takes place during rolling and is a so-called hot rib. In contrast, stretching takes place as cold stretching. It goes without saying that the yield strength and the elongation are set so that the prescribed, standardized values are observed. - The invention further relates to a plant for performing such a method.
Bei dem großtechnisch ausgeführten, bekannten Verfahren, von dem die Erfindung ausgeht, resultiert das Recken aus einer Torsionsverformung mit Hilfe einer Torsionsmaschine, die diskontinuierlich arbeitet. Die diskontinuierliche Verfahrensführung stört den betrieblichen Ablauf. Für die einzustellende Streckgrenze sowie für die einzustellende Reckung müssen verhältnismäßig große, unvermeidbare Toleranzen zugelassen oder berücksichtigt werden. Insbesondere sind die Werte für die Streckgrenze und die Reckung über die Länge eines Betonstahls nach Maßgabe der unterschiedlichen Reckungsabschnitte, die zu der diskontinuierlichen Verfahrenweise gehören, wenig gleichmäßig. Die Dauerschwingungsfestigkeit des so gereckten Be tonstahls ist häufig unbefriedigend. Es besteht bei Schwingungsbeanspruchungen Dauerbruchgefahr. Andererseits verlangt die Praxis in zunehmendem Maße auch hohe Werte für die Dauerschwingungsfestigkeit. - Wegen der beschriebenen Probleme wird, um bei Beton stahl die vorgeschriebenen Werte für die Streckgrenze und die Dehnung einzuhalten, häufig von der beschriebenen Kaltreckung durch Torsion Abstand genommen und werden die vorgeschriebenen physikalischen Eigenschaften durch Microlegierung eingestellt, insbesondere durch Zugabe von Vanadium. Das führt zu befriedigenden Ergebnissen. Das ist jedoch wegen der Notwendigkeit, Vanadium zuzulegieren, aufwendig, zumal die Vanadium-Preise in der Tendenz seit vielen Jahren steigen und weitere Steigungen zu erwarten sind.In the known, large-scale process from which the invention is based, the stretching results from a torsional deformation with the aid of a torsional machine which operates discontinuously. The discontinuous procedure interferes with the operational process. Relatively large, unavoidable tolerances must be permitted or taken into account for the yield strength to be set and for the stretching to be set. In particular, the values for the yield strength and the stretching over the length of a reinforcing steel are not very uniform in accordance with the different stretching sections which belong to the discontinuous procedure. The fatigue strength of the stretched concrete is often unsatisfactory. There is a risk of fatigue failure in the event of vibration stress. On the other hand, practice increasingly demands high values for the fatigue strength. - Because of the problems described, in order to concrete stole the prescribed values for the yield strength and the elongation, often removed from the described cold stretching by torsion and the prescribed physical properties are set by micro-alloying, especially by adding vanadium. This leads to satisfactory results. However, this is complex because of the need to add vanadium, especially since the vanadium prices have been rising for many years and further increases are expected.
In neuerer Zeit ist über Versuche berichtet worden, die nicht zum Stand der Technik gehören und die sich bemühen, das Microlegieren durch ein kontinuierliches Recken zu ersetzen (Werkzeitschrift "Report" der Hamburger Stahlwerke Gesellschaft mit beschränkter Haftung vom 22. Juni 1989, Seite 11). Diese Versuche wurden mit einer Reckmaschine durchgeführt, die zwei mit unterschiedlicher Umfangsgeschwindigkeit arbeitende Reckscheiben aufweisen. Die Erfindung schließt an diese Versuche an.There have been recent reports of attempts which do not belong to the prior art and which attempt to replace microalloying with continuous stretching (work magazine "Report" of the Hamburger Stahlwerke Gesellschaft mit Limited Liability of June 22, 1989, page 11) . These tests were carried out using a stretching machine which has two stretching disks operating at different peripheral speeds. The invention follows on from these experiments.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene Verfahren so zu führen, daß die Streckgrenze und die Dehnung sehr genau eingestellt werden können und auch weitere physikalische Eigenschaften des Betonstahls, insbesondere sein Dauerschwingungsverhalten, verbessert werden. Der Erfindung liegt fernerhin die Aufgabe zugrunde, eine Anlage anzugeben, mit der das erfindungsgemäße Verfahren auf besonders einfache Weise und zuverlässig durchführbar ist.The invention has for its object to carry out the method described above so that the yield strength and the elongation can be set very precisely and also other physical properties of the reinforcing steel, in particular its fatigue behavior, are improved. The invention is also based on the object of specifying a system with which the method according to the invention can be carried out in a particularly simple and reliable manner.
Zur Lösung dieser Aufgabe lehrt die Erfindung, daß der Stahldraht kontinuierlich gereckt wird und dazu über zumindest zwei angetriebene Reckscheiben (oder Reckwalzen) geführt wird, die mit unter schiedlichen Umfangsgeschwindigkeiten auf dem Stahldraht arbeiten, daß über die Umfangsgeschwindigkeitsdifferenz der beiden Reckscheiben der Reckgrad gesteuert wird und daß über die Reckgeschwindigkeit die Streckgrenze und die Dehnung gesteuert werden. - Die Erfindung geht von der Erkenntnis aus, daß bei einem kontinuierlichen linearen Recken die Möglichkeit besteht, bei vorgegebenem Reckgrad durch die Reckgeschwindigkeit in den Prozeß in dem Sinne optimierend einzugreifen, daß sehr genaue Werte für die Streckgrenze und die Dehnung vorgegeben und eingehalten werden können. Dabei ist neben der Reckgeschwindigkeit nach wie vor der Reckgrad eine Einflußgröße, die variiert werden kann. Überraschenderweise zeichnen sich die so hergestellten Betonstähle auch durch eine sehr hohe Dauerschwingungsfestigkeit aus. Insoweit soll die Reckgeschwindigkeit zwar so gewählt werden, daß die vorgegebenen Werte für die Streckgrenze und die Dehnung eingehalten werden, jedoch soll die Reckgeschwindigkeit innerhalb dieser Bedingung so niedrig wie möglich gewählt werden. - Reckgrad bezeichnet die Längung, die der Stahldraht bzw. eine Längeneinheit des Stahldrahtes bei der Reckung erfährt, in Prozent. Reckgeschwindigkeit bezeichnet die bleibende Längenänderung des Stahldrahtes bzw. einer Längeneinheit des Stahldrahtes im Bereich zwischen den beiden Reckscheiben in der Zeiteinheit. Beide Größen können erfindungsgemäß durch Einflußnahme auf die Umfangsgeschwindigkeiten der Reckscheiben eingestellt und eingehalten werden. Im Rahmen der Erfindung werden keine absoluten Zahlen für die Reckgeschwindigkeit angegeben, weil die optimalen absoluten Zahlen auch von dem Reckgrad und dem Krümmungsradius abhängen, den der Stahldraht bei der Umschlingung der Reckscheiben erfährt. Mit der Lehre, daß über die Reckgeschwindigkeit die Streckgrenze und die Dehnung gesteuert werden, lassen sich die absoluten Werte für die Reckgeschwindigkeit bei vor gegebenem Durchmesser der Reckscheiben unschwer experimentell ermitteln. Im Sinne einer Optimierung ist es zweckmäßig, den Stahldraht mit einem Mindestkrümmungsradius von 500 mm über die Reckscheiben zu führen. Das gilt für alle übliche Stahldrahtdicken. Diese Maßnahme stellt sicher, daß sich eine störende, in bezug auf den Stahldrahtquerschnitt unsymmetrische Biegekaltverformung der linearen Reckung nicht überlagert. Um die Zahlenwerte in bezug auf den Reckgrad und die Reckgeschwindigkeit genau einzuhalten, wird nach bevorzugter Ausführungsform der Erfindung der Stahldraht schlupffrei über die Reckscheiben geführt. Das kann auf verschiedene Weise erreicht werden, z. B. durch aufvulkanisierte gummielastische Auflagen auf der Lauffläche der Reckscheiben, durch Formschlußausbildungen, die mit den Rippen auf den Stahldrähten korrespondieren. Das kann auch auf andere Weise erreicht werden, unter Umständen auch durch Mehrfachumschlingung der Reckscheiben. Es ist jedoch stets vorteilhaft, den Stahldraht rippenschadenfrei über die Reckscheiben zu führen. Auch insoweit erweisen sich gummielastische Auflagen und angepaßte Formschlußausbildungen als vorteilhaft. - Arbeitet man in der beschriebenen Weise, so ist nicht nur sichergestellt, daß die Streckgrenze und die Dehnung, wie vorgegeben, sehr genau eingestellt und eingehalten werden können. Man erzielt, wie bereits betont, auch eine überraschende Reduzierung der Dauerbruchempfindlichkeit. Tatsächlich gehen im Rahmen der bekannten Maßnahmen die Dauerbrüche häufig auch von Microrissen im Oberflächenbereich der Stahldrähte aus, die ihrerseits auf Schäden an den Rippen oder auf anderen Fehlern beruhen. Die Bildung von insoweit störenden Microrissen läßt sich erfindungsgemäß durch Einstellung der Reckgeschwindigkeit weitgehend vermeiden, wobei nichtsdestoweniger die Streckgrenze und die Dehnung sehr genau gesteuert werden können.To achieve this object, the invention teaches that the steel wire is continuously stretched and, for this purpose, is guided over at least two driven stretching disks (or stretching rollers), which are under Different peripheral speeds work on the steel wire, that the degree of stretch is controlled via the difference in peripheral speed of the two stretching disks and that the yield strength and the elongation are controlled via the stretching speed. - The invention is based on the knowledge that with a continuous linear stretching there is the possibility, for a given degree of stretching, of intervening to optimize the process in the sense that very precise values for the yield strength and the elongation can be specified and maintained. In addition to the stretching speed, the degree of stretching is still an influencing variable which can be varied. Surprisingly, the reinforcing steel produced in this way is also characterized by a very high fatigue strength. In this respect, the stretching speed should be selected so that the specified values for the yield point and the elongation are maintained, but the stretching speed should be selected as low as possible within this condition. - Degree of stretching denotes the elongation that the steel wire or a unit of length of the steel wire undergoes during stretching, in percent. Stretching speed denotes the permanent change in length of the steel wire or a unit of length of the steel wire in the area between the two stretching disks in the unit of time. According to the invention, both variables can be set and maintained by influencing the peripheral speeds of the stretching disks. In the context of the invention, no absolute numbers are given for the stretching speed, because the optimal absolute numbers also depend on the degree of stretching and the radius of curvature which the steel wire experiences during the wrapping of the stretching disks. With the teaching that the stretching limit and the elongation are controlled via the stretching speed, the absolute values for the stretching speed can be given at easily determine the given diameter of the stretching discs experimentally. For optimization purposes, it is advisable to guide the steel wire over the stretching discs with a minimum radius of curvature of 500 mm. This applies to all common steel wire thicknesses. This measure ensures that a disruptive bending cold deformation that is asymmetrical with respect to the steel wire cross section is not superimposed on the linear stretching. In order to adhere exactly to the numerical values with regard to the degree of stretching and the speed of stretching, according to a preferred embodiment of the invention the steel wire is guided over the stretching disks without slippage. This can be accomplished in several ways, e.g. B. by vulcanized rubber-elastic pads on the tread of the stretching discs, by form-fitting configurations that correspond to the ribs on the steel wires. This can also be achieved in other ways, possibly also by multiple wrapping of the stretching discs. However, it is always advantageous to guide the steel wire over the stretching discs without damaging the ribs. In this respect, too, rubber-elastic pads and adapted form-fitting designs have proven to be advantageous. - If you work in the manner described, it is not only ensured that the yield strength and the elongation, as specified, can be set and maintained very precisely. As already emphasized, a surprising reduction in the susceptibility to fatigue fracture is also achieved. In fact, in the context of the known measures, the fatigue fractures often also start from microcracks in the surface area of the steel wires, which in turn are based on damage to the ribs or other defects. According to the invention, the formation of microcracks which are disruptive in this respect can largely be avoided by adjusting the stretching speed, but the yield strength and the elongation can nevertheless be controlled very precisely.
In der Ausführungsform, bei der warmgerippter Stahldraht über einen Windungsleger aus der Walzhitze heraus mit einer bleibenden Tordierungsverformung von 360°C pro Windung abgelegt wird und mit dieser Tordierungsverformung im kalten Zustand von einem Schlaghaspel abgezogen wird, besteht im Rahmen der Erfindung die Möglichkeit, der beschriebenen vorteilhaften linearen Reckung eine Torsionsreckung zu überlagern. Dazu lehrt die Erfindung, daß der von dem Schlaghaspel abgezogene Stahldraht vor der Zuführung zu der ersten Reckscheibe einer Rückverformung unterworfen wird, die die Trodierungsverformung aufhebt oder weitgehend reduziert.In the embodiment in which hot-ripped steel wire is deposited from the rolling heat using a winding layer with a permanent twist deformation of 360 ° C. per turn and is pulled off this with a twist deformation in the cold state from a beater, there is the possibility within the scope of the invention that described advantageous linear stretching to superimpose a torsional stretch. To this end, the invention teaches that the steel wire drawn off from the beater reel is subjected to a return deformation prior to being fed to the first stretching disk, which cancels or largely reduces the trodden deformation.
Das erfindungsgemäße Verfahren hat sich besonders bewährt für die speziellen Stähle, die in den Ansprüchen 6 und 7 behandelt sind, wenn die in diesen Ansprüchen angegebenen Verfahrensparameter eingehalten werden. Werden diese eingehalten, so lassen sich im allgemeinen Betriebsverhältnisse verwirklichen, bei denen mit einer Umfangsgeschwindigkeit der Reckscheiben von mindestens 1,0 m/sek. bis maximal 8,0 m/sek. gearbeitet wird. Es versteht sich, daß die Umfangsgeschwindigkeit in diesem Bereich in Abhängigkeit vom Drahtdurchmesser optimierend eingestellt wird.The process according to the invention has proven particularly useful for the special steels which are dealt with in claims 6 and 7 if the process parameters specified in these claims are observed. If these are observed, general operating conditions can be achieved in which the circumferential speed of the stretching discs is at least 1.0 m / sec. up to a maximum of 8.0 m / sec. is worked. It goes without saying that the peripheral speed in this area is set in an optimizing manner as a function of the wire diameter.
Gegenstand der Erfindung ist auch eine Anlage, die für die Durchführung des beschriebenen Verfahrens besonders geeignet ist. Insoweit wird auf die Zeichnung verwiesen, die eine schematische Darstellung einer solchen Anlage zeigt.The invention also relates to a plant which is particularly suitable for carrying out the method described. In this regard, reference is made to the drawing, which shows a schematic representation of such a system.
Man erkennt in der Zeichnung eine Einlaufreckscheibe 1, eine Ablaufreckscheibe 2 und ein Motor/Getriebe-Aggregat 3 bzw. 4 an jeder der Reckscheiben 1 bzw. 2. Die Reckscheiben 1 bzw. 2 besitzen einen Radius von zumindest 500 mm. Sie sind über das Motor/Getriebe-Aggregat 3 bzw. 4 mit vorgebbarer Umfangsgeschwindigkeit und vorgeb barer Umfangsgeschwindigkeitsdifferenz antreibbar. Der Stahldraht 5 ist um die beiden Reckscheiben 1 bzw. 2 S-förmig geführt. Er ist der Einlaufreckscheibe 1 mit einem tangentialen Einlaufabschnitt 6 zuführbar und von der Ablaufreckscheibe 2 mit einem tangentialen Ablaufabschnitt 7 abführbar. Angedeutet wurde, daß der warmgerippte Stahldraht 5, der über einen Windungsleger aus der Walzhitze heraus mit einer bleibenden Torsionsverformung von 360° pro Windung abgelegt wurde, mit dieser Tordierungsverformung im kalten Zustand von einem Schlaghaspel 8 abgezogen wird. Im Bereich des tangentialen Einlaufabschnittes 6 dieses Stahldrahtes befindet sich eine Rückverformungseinrichtung 9 für diese Torsionsverformung. Die Rückverformungseinrichtung 9 arbeitet mit Rückverformungsrollen 10. Es versteht sich, daß die Reckscheiben 1 bzw. 2 so ausgelegt sind, daß sie den Stahldraht 5 schlupffrei führen. Die Auslegung ist fernerhin so getroffen, daß die Rippen des Stahldrahtes 5 auf den Reckscheiben 1 bzw. 2 und in der Rückverformungseinrichtung 9 keinen Schaden nehmen.One can see in the drawing an inlet stretching disk 1, a
Claims (10)
Kohlenstoff : 0,14 bis 0,22%,
Silicium : 0,15 bis 0,40%,
Mangan : 0,60 bis 1,30%,
Rest Eisen und zulässige Spuren- und Begleitelemente,
liegt, daß mit einem Reckgrad von maximal 6% die Reckung durchgeführt wird und daß die Reckgeschwindigkeit so gewählt wird, daß der gereckte Betonstahl eine Streckgrenze größer als 500 N/mm² und eine Dehnung von zumindest 15% aufweist.6. The method according to any one of claims 1 to 5, characterized in that one works with a steel wire in the analysis frame
Carbon: 0.14 to 0.22%,
Silicon: 0.15 to 0.40%,
Manganese: 0.60 to 1.30%,
Remainder iron and permissible trace and accompanying elements,
lies that the stretching is carried out with a maximum degree of stretching of 6% and that the stretching speed is selected so that the stretched reinforcing steel has a yield strength greater than 500 N / mm² and an elongation of at least 15%.
Kohlenstoff : 0, 18%,
Silicium : 0,24%,
Mangan : 0,80%,
Rest Eisen und zulässige Spuren- und Begleitelemente,
aufweist, daß mit einem Reckgrad von 5,7% die Reckung durchgeführt wird und daß die Reckgeschwindigkeit so gewählt wird, daß der gereckte Betonstahl eine Streckgrenze von etwa 521 N/mm² und eine Dehnung von 18,3% aufweist.7. The method according to claim 6, characterized in that one works with a steel wire, the analysis
Carbon: 0, 18%,
Silicon: 0.24%,
Manganese: 0.80%,
Remainder iron and permissible trace and accompanying elements,
has that the stretching is carried out with a degree of stretching of 5.7% and that the stretching speed is selected so that the stretched reinforcing steel has a yield strength of approximately 521 N / mm² and an elongation of 18.3%.
eine Einlaufreckscheibe,
eine Ablaufreckscheibe und
zumindest ein Motor/Getriebe-Aggregat,
wobei die Reckscheiben einen Radius von zumindest 500 mm aufweisen und über das Motor/Getriebe-Aggregat mit vorgebbarer Umfangsgeschwindigkeit und vorgebbarer Umfangsgeschwindigkeitsdifferenz antreibbar sind, und wobei der Stahldraht um die beiden Reckscheiben S-förmig geführt sowie der Einlaufreckscheibe mit einem tangentialen Einlaufabschnitt zuführbar und von der Ablaufreckscheibe mit einem tangentialen Ablaufabschnitt abführbar ist.9. Plant for performing the method according to one of claims 1 to 8, characterized by
an inlet stretch disk,
a drain stretching disc and
at least one engine / transmission unit,
wherein the stretching disks have a radius of at least 500 mm and can be driven via the motor / gear unit with a predeterminable peripheral speed and a predeterminable peripheral speed difference, and wherein the steel wire is guided in an S-shape around the two stretching disks and can be fed to the inlet stretching disk with a tangential inlet section and from which Drain stretching disc can be removed with a tangential drain section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90111026T ATE95453T1 (en) | 1989-06-14 | 1990-06-12 | METHOD OF MANUFACTURING RIBBED REINFORCEMENT STEEL. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3919382 | 1989-06-14 | ||
DE3919382A DE3919382A1 (en) | 1989-06-14 | 1989-06-14 | DEVICE FOR INCREASING THE STRETCH LIMIT OF HOT ROLLED WIRE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0403916A1 true EP0403916A1 (en) | 1990-12-27 |
EP0403916B1 EP0403916B1 (en) | 1993-10-06 |
Family
ID=6382709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90111026A Expired - Lifetime EP0403916B1 (en) | 1989-06-14 | 1990-06-12 | Method for production of ribbed reinforcing steel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0403916B1 (en) |
AT (1) | ATE95453T1 (en) |
DE (2) | DE3919382A1 (en) |
ES (1) | ES2048363T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0469410A1 (en) * | 1990-08-03 | 1992-02-05 | HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH | Method and device for strengthening of reinforcing bars for concrete |
KR102389355B1 (en) * | 2020-11-10 | 2022-04-21 | 한국재료연구원 | Wire rod having uniform hardness and method of manufacturing the same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1907350A1 (en) * | 1969-02-14 | 1970-09-03 | Siemens Ag | Wire-drawing installation |
DE2707027A1 (en) * | 1976-02-23 | 1977-08-25 | Crouzet Sa | WIRE DRAWING MACHINE |
DE2449268B2 (en) * | 1973-10-19 | 1977-11-17 | Vereinigte Österreichische Eisen- und Stahlwerke - Alpine Montan AG, Wien | DEVICE FOR CONTINUOUS COLD STRENGTHENING OF A METALLIC WIRE ROD |
US4112725A (en) * | 1976-09-14 | 1978-09-12 | Sumitomo Electric Industries, Ltd. | Method and apparatus for continuously hot-stretching a steel cable |
FR2395791A2 (en) * | 1977-07-01 | 1979-01-26 | Crouzet Sa | ADVANCED THREADING MACHINE |
-
1989
- 1989-06-14 DE DE3919382A patent/DE3919382A1/en not_active Withdrawn
-
1990
- 1990-06-12 EP EP90111026A patent/EP0403916B1/en not_active Expired - Lifetime
- 1990-06-12 AT AT90111026T patent/ATE95453T1/en not_active IP Right Cessation
- 1990-06-12 ES ES90111026T patent/ES2048363T3/en not_active Expired - Lifetime
- 1990-06-12 DE DE90111026T patent/DE59002981D1/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1907350A1 (en) * | 1969-02-14 | 1970-09-03 | Siemens Ag | Wire-drawing installation |
DE2449268B2 (en) * | 1973-10-19 | 1977-11-17 | Vereinigte Österreichische Eisen- und Stahlwerke - Alpine Montan AG, Wien | DEVICE FOR CONTINUOUS COLD STRENGTHENING OF A METALLIC WIRE ROD |
DE2707027A1 (en) * | 1976-02-23 | 1977-08-25 | Crouzet Sa | WIRE DRAWING MACHINE |
US4112725A (en) * | 1976-09-14 | 1978-09-12 | Sumitomo Electric Industries, Ltd. | Method and apparatus for continuously hot-stretching a steel cable |
FR2395791A2 (en) * | 1977-07-01 | 1979-01-26 | Crouzet Sa | ADVANCED THREADING MACHINE |
Non-Patent Citations (1)
Title |
---|
Werkzeitschrift "REPORT" der Hamburger Stahlwerke Ges. m.b.h. 22. Juni 1989 Seite 11 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0469410A1 (en) * | 1990-08-03 | 1992-02-05 | HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH | Method and device for strengthening of reinforcing bars for concrete |
KR102389355B1 (en) * | 2020-11-10 | 2022-04-21 | 한국재료연구원 | Wire rod having uniform hardness and method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
DE3919382A1 (en) | 1991-01-03 |
EP0403916B1 (en) | 1993-10-06 |
DE59002981D1 (en) | 1993-11-11 |
ATE95453T1 (en) | 1993-10-15 |
ES2048363T3 (en) | 1994-03-16 |
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