EP0469410B1 - Verfahren und Anlage zur Verfestigung von Betonstahl - Google Patents

Verfahren und Anlage zur Verfestigung von Betonstahl Download PDF

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Publication number
EP0469410B1
EP0469410B1 EP91112149A EP91112149A EP0469410B1 EP 0469410 B1 EP0469410 B1 EP 0469410B1 EP 91112149 A EP91112149 A EP 91112149A EP 91112149 A EP91112149 A EP 91112149A EP 0469410 B1 EP0469410 B1 EP 0469410B1
Authority
EP
European Patent Office
Prior art keywords
reinforcing steel
bending
concrete
process according
hardening
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
Application number
EP91112149A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0469410A1 (de
Inventor
Robert Thiesbürger
Wolfgang Preiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH
Original Assignee
HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of EP0469410A1 publication Critical patent/EP0469410A1/de
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Classifications

    • 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
    • B21F9/005—Straining wire to affect the material properties of the wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
    • 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
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/105—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars of concrete reinforcing bars

Definitions

  • the invention relates to a method for the strengthening of reinforcing steel, in particular weldable reinforcing steel, which was produced by hot rolling, the reinforcing steel being subjected to mechanical deformation in a cold and continuous manner in the torsion-free pass in various bending planes and thereby adjusted, inter alia, with regard to its yield strength and its elongation becomes.
  • reinforcing steel denotes ribbed and non-ribbed reinforcing steel, in particular also reinforcing steel with oblique ribs and optionally longitudinal ribs, e.g. Reinforcing steel according to DIN 488.
  • the invention further relates to a system for performing the described method.
  • the mechanical deformation is cold stretching.
  • the stretching results from a torsional deformation with the aid of a torsional machine that works discontinuously.
  • the discontinuous procedure interferes with the operational process.
  • Relatively large, unavoidable tolerances must be permitted and taken into account for the yield point to be set and 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 reinforcing steel 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 bending deformation on the stretching discs is sparse. It is set up in such a way that the frictional forces acting on the reinforcing steel are sufficient to take the reinforcing steel sufficiently slip-free and cause the stretching described in the area between the two stretching disks.
  • the bending deformation on the stretching discs does not have any effect which significantly contributes to the strengthening itself.
  • the stretching takes place in the longitudinal direction of the reinforcing steel.
  • the hardening generated is a uniaxial strain hardening with considerable anisotropy across the cross-section of the reinforcing steel.
  • the quality improvements that can be achieved through this strain hardening can be impaired by the Bauschinger effect, which is disruptive for certain applications of the manufactured and hardened reinforcing steel.
  • the Bauschinger effect describes a special physical appearance: The plastic deformation of a material in one direction is based on the knowledge of Bauschinger the elastic limit with subsequent deformation in the opposite direction. The Bauschinger effect is based on the formation of internal stresses that are effective against the original direction of deformation.
  • the Bauschinger effect also has an effect in a generic method in which the reinforcing steel is deformed in two bending planes arranged orthogonally to one another (EP-A-0 194 478).
  • the invention has for its object to perform the method described above so that a very isotropic strain hardening is achieved over the cross section of the reinforcing steel.
  • the invention is further based on the object of specifying a system which is particularly suitable for carrying out the method according to the invention.
  • the invention teaches from a process engineering point of view that the reinforcing steel in three different bending planes, which are offset by approximately 120 ° from one another, is subjected to a multi-stage bending deformation around bending rollers and is thus superposed multi-axially strain-hardened in the bending planes, whereby an extension of the reinforcing steel is achieved and that the yield strength and the elongation are set by the extent of the extension.
  • the reinforcing steel is preferably subjected to a three-stage bending deformation in three different bending planes which are offset from one another by approximately 120 °.
  • the reinforcing steel can be subjected to multi-stage bending deformation at a throughput speed of 1 to 25 m / sec.
  • the reinforcing steel undergoes a bending in bending planes that are offset from one another as described, it can be said that a multi-axis bending state or a multi-axis strain hardening state can be spoken about the reinforcing steel axis.
  • this leads to the fact that every point on the reinforcing steel surface is subjected to this stress in a continuously changing manner.
  • the result is a very even and very isotropic hardening and a very defined and even decrease in cross-section. Surprisingly, the annoying Bauschinger effect disappears.
  • the quality values of the reinforcing steel in terms of yield strength, tensile strength and Elongation at break is significantly improved and can be adjusted or controlled via the extension, ie the degree of stretching.
  • the effects according to the invention are particularly pronounced when working with three bending planes as described.
  • a preferred embodiment of the invention is characterized in that an extension of the reinforcing steel of at least 5% is used. It is understood that within the scope of the invention a sufficiently pronounced bending deformation must be realized. It has been proven that the reinforcing steel is guided on the individual bending rollers with a wrap angle of 100 to 150 °. It can be worked with bending rollers that have a diameter in the diameter range that has been specified in claim 6.
  • the hardening can be set up and controlled via the extension that the reinforcing steel is subjected to in the method according to the invention.
  • the invention teaches in detail that the extension which the reinforcing steel undergoes during the hardening, and thus the hardening, is set up, even at a predetermined throughput speed, by selecting the diameter of the bending rollers and / or varying the wrap angle. It is within the scope of the invention to set the diameter of the bending roller and / or the wrap angle differently in the individual bending deformation stages. In any case, the wrap angle can be adjusted operationally.
  • the method according to the invention is suitable for a wide variety of reinforcing steels customary in the construction industry.
  • the method has proven particularly useful when working with a reinforcing steel in the diameter range of 6 to 14 mm.
  • the object of the invention is in particular that a reinforcing steel according to DIN 488 is subjected to the method according to the invention. Following the consolidation can with usual Aids a straightening of the reinforcing steel are carried out, during or after the usual cutting to the lengths that the reinforcing steel must have for use.
  • the invention also relates to a plant for the strengthening of reinforcing steel, in particular weldable reinforcing steel, which was produced by hot rolling, with a plurality of roller straightening units which are arranged one behind the other in different bending planes in the direction of travel of the reinforcing steel, characterized by three roller straightening units, each with a defined bending plane, around each other 120 ° offset, each roller straightener has two support rollers and a bending roller arranged in the area between the support rollers.
  • the bending roller is adjustable relative to the support rollers and the wrap angle is thereby adjustable.
  • the reinforcing steel 4 is subjected to a three-stage bending deformation by one bending roller 6 in each case in the torsion-free passage in three different bending planes A, B, C, which are offset by approximately 120 ° from one another. As a result, it is superposed triple-axis strain hardened in the three bending planes A, B, C.
  • An extension of the reinforcing steel 4 is achieved.
  • the yield point and the elongation can be adjusted by the length of the extension.
  • the bending rollers 6 can be specially selected with respect to the bending roller diameter d, and the wrap angle ⁇ can be particularly adjusted. - Proceed accordingly if you work with more than three bending levels.
  • the bending-hardening process is followed by a continuously working straightening system, which straightens the solidified material and cuts it to bars of a defined length. Both systems are set up in a line and work synchronously.
  • the straightened material can be used as primary material for bending and reinforcement companies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Wire Processing (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Artificial Fish Reefs (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Heat Treatment Of Steel (AREA)
EP91112149A 1990-08-03 1991-07-20 Verfahren und Anlage zur Verfestigung von Betonstahl Expired - Lifetime EP0469410B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4024653A DE4024653C1 (enrdf_load_stackoverflow) 1990-08-03 1990-08-03
DE4024653 1990-08-03

Publications (2)

Publication Number Publication Date
EP0469410A1 EP0469410A1 (de) 1992-02-05
EP0469410B1 true EP0469410B1 (de) 1994-06-01

Family

ID=6411580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112149A Expired - Lifetime EP0469410B1 (de) 1990-08-03 1991-07-20 Verfahren und Anlage zur Verfestigung von Betonstahl

Country Status (5)

Country Link
EP (1) EP0469410B1 (enrdf_load_stackoverflow)
AT (1) ATE106287T1 (enrdf_load_stackoverflow)
DE (2) DE4024653C1 (enrdf_load_stackoverflow)
DK (1) DK0469410T3 (enrdf_load_stackoverflow)
ES (1) ES2054405T3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107604139A (zh) * 2017-11-06 2018-01-19 舟山市7412工厂 一种金属原料的硬化装置及其硬化方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626756C (de) * 1934-07-28 1936-03-02 Alfred Varley Sims Selbsttaetiges Ventil
DE746251C (de) * 1941-05-13 1945-01-08 Kohle- Und Eisenforschung Gmbh Verfahren zur Erhoehung der Biege- und Verwindezahlen von im Betrieb versproedeten Stahldraehten
DE1533992A1 (de) * 1967-05-16 1970-02-19 Rehm Gallus Verfahren zur Erhoehung der Elastizitaetsgrenze,der Streckgrenze und gegebenenfalls der Bruchfestigkeit von Stahl durch Kaltverformung
AT339852B (de) * 1973-10-19 1977-11-10 Voest Ag Vorrichtung zum kontinuierlichen kaltverfestigen von stabformigem metallischen walzgut, insbesondere stahldraht
US4216666A (en) * 1978-09-18 1980-08-12 Extruded Metals Method of relieving stress in extruded sections
DE3667255D1 (de) * 1985-03-08 1990-01-11 Piegatrici Macch Elettr Vorrichtung zum richten von staebe ohne eine um die laengsachse relative verdrehung aufeinanderfolgender materialsegmente.
DE3919382A1 (de) * 1989-06-14 1991-01-03 Kt Baustahl Vertrieb Vorrichtung zur streckgrenzenerhoehung von warm gewalztem draht

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107604139A (zh) * 2017-11-06 2018-01-19 舟山市7412工厂 一种金属原料的硬化装置及其硬化方法

Also Published As

Publication number Publication date
DE9106386U1 (de) 1991-08-08
DK0469410T3 (da) 1994-07-11
ES2054405T3 (es) 1994-08-01
ATE106287T1 (de) 1994-06-15
EP0469410A1 (de) 1992-02-05
DE4024653C1 (enrdf_load_stackoverflow) 1991-07-25

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