EP0976469A2 - Procédé de redressage linéaire - Google Patents

Procédé de redressage linéaire Download PDF

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Publication number
EP0976469A2
EP0976469A2 EP99890245A EP99890245A EP0976469A2 EP 0976469 A2 EP0976469 A2 EP 0976469A2 EP 99890245 A EP99890245 A EP 99890245A EP 99890245 A EP99890245 A EP 99890245A EP 0976469 A2 EP0976469 A2 EP 0976469A2
Authority
EP
European Patent Office
Prior art keywords
rod
stresses
cross
straightening
longitudinal direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99890245A
Other languages
German (de)
English (en)
Other versions
EP0976469A3 (fr
Inventor
Werner Friedrich Dipl-Ing Dr-Ing Schwenzfeier
Josef Dipl-Ing. Gahleitner
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.)
Institut fur Verformungskunde und Huettenmaschinen
Original Assignee
Institut fur Verformungskunde und Huettenmaschinen
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.)
Filing date
Publication date
Application filed by Institut fur Verformungskunde und Huettenmaschinen filed Critical Institut fur Verformungskunde und Huettenmaschinen
Publication of EP0976469A2 publication Critical patent/EP0976469A2/fr
Publication of EP0976469A3 publication Critical patent/EP0976469A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method for straightening rod-shaped, metallic material with possibly different strength over the Cross section, for example of rolled and / or mechanical and / or thermally treated bars, such as round bars, railroad tracks and the like, for setting high material strength of the target and certain or low residual stresses in this through plastic Longitudinal compression with subsequent plastic stretching.
  • a linear straightening of metallic rod material takes place in each case by at least partial plastic deformation of the material across the cross-section.
  • A is particularly widespread, even for larger cross-sections of the leveling material so-called bending straightening, in which the rod, mostly in a continuous process, is bent back and forth by means of rollers.
  • bending straightening in which the rod, mostly in a continuous process, is bent back and forth by means of rollers.
  • a method has become known from SU - 1 311 807 A1 which uses a plastic compression deformation with subsequent tensile deformation is disclosed, in particular a high uniformity of the cross section of the straightening good should be achieved.
  • the development of Curvatures during straightening with differences in strength in Cross-sectional areas of the rod is disclosed.
  • the invention aims to overcome the disadvantages of the known straightening methods to remove rod-shaped metallic goods and a new improved To create procedures with which after the straightening the rod or Rod has high linearity, even if in the cross section of the same areas with different strength. It is in extension of this goal task according to the invention, desired residual stresses in the leveling material minimize and / or set to desired values.
  • the main advantages achieved with the invention are that at The best level of quality longitudinal internal stresses in the goods are set in the desired manner or can essentially be completely degraded. Through the Material expansion in the second step will also have a high yield strength Real good achieved.
  • the invention has been found to be based on the following findings: If there are areas with different strengths in the target cross-section, then In the first process step, the less firm areas are compressed earlier plasticized than the higher strength; overall, however, the permanent change in shape be kept as low as possible. Now there is a in the second step Elongation of the rod until the stresses in the entire cross-section are equal are, this means that the less rigid cross-sectional areas are a have experienced a correspondingly large permanent extension, so lie after the Do not relieve any axially directed residual stresses in the leveling material. The degree of stretch is determined by the difference in flow resistance in the material. But should for example in the case of round bars machined without cutting which are close to the surface coaxial compressive stresses are only partially reduced, so is the elongation the same to make less in the second step.
  • Fig. 1 is a stress-strain diagram for the Shown method according to the invention, wherein a linear to be straightened good Has internal stresses and different material strength in cross-section.
  • Fig. 2 is a stress-strain diagram for the method according to the invention to take, in the cross section of the initially differing longitudinal residual stresses A1 and K1 given are.
  • the upsetting of the leveling material in the intended first step of the Procedure is reached after reaching the respective elastic limit A2 and A3 or from K2 to K3.
  • Fig. 3 shows essentially the same diagram, with the Bauschinger effect Is taken into account. Is after plastic pressure forming of the material exposed to a tensile load + ⁇ , a flow or a begins Plasticization already at much lower stresses ⁇ , like this from the curved waveforms K3 to K4 and A3 in the direction of A4 in the diagram emerges.
  • P1, L1 and S1 were again determined using the Borehole method for an average residual hole depth of 1 mm.
  • the Results S1 show that the target material has extremely low residual stresses in Longitudinal direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP99890245A 1998-07-27 1999-07-21 Procédé de redressage linéaire Withdrawn EP0976469A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT128998 1998-07-27
AT128998A AT409230B (de) 1998-07-27 1998-07-27 Verfahren zum linearrichten

Publications (2)

Publication Number Publication Date
EP0976469A2 true EP0976469A2 (fr) 2000-02-02
EP0976469A3 EP0976469A3 (fr) 2002-12-18

Family

ID=3510678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99890245A Withdrawn EP0976469A3 (fr) 1998-07-27 1999-07-21 Procédé de redressage linéaire

Country Status (2)

Country Link
EP (1) EP0976469A3 (fr)
AT (1) AT409230B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037999A1 (fr) * 2011-09-16 2013-03-21 Siemens Aktiengesellschaft Aube de compresseur et son procédé de fabrication
CN106834639A (zh) * 2017-04-02 2017-06-13 首钢总公司 控制非调质高强螺栓钢高包辛格效应的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1527434A1 (de) 1963-03-19 1969-12-18 Truninger Ag Streckmaschine zum Streckrichten von Streckgut,insbesondere Hohlprofilen aus Stahl
SU1148663A1 (ru) 1982-09-10 1985-04-07 Научно-исследовательский и опытно-конструкторский институт автоматизации черной металлургии Способ правки длинномерного проката
SU1311807A1 (ru) 1985-04-30 1987-05-23 Украинский научно-исследовательский институт металлов Способ правки проката
EP0234204A2 (fr) 1986-02-21 1987-09-02 Krupp Stahl AG Procédé et dispositif pour dresser un rail du chemin de fer dans une dresseuse à rouleaux
EP0671983B1 (fr) 1992-12-02 1997-03-26 MANNESMANN Aktiengesellschaft Procede et machine-outil lineaire travaillant le metal par formage pour le dressage de pieces en forme de barre

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945505A1 (de) * 1979-11-10 1981-05-21 Schloemann-Siemag AG, 4000 Düsseldorf Richtmaschine fuer bleche und baender

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1527434A1 (de) 1963-03-19 1969-12-18 Truninger Ag Streckmaschine zum Streckrichten von Streckgut,insbesondere Hohlprofilen aus Stahl
SU1148663A1 (ru) 1982-09-10 1985-04-07 Научно-исследовательский и опытно-конструкторский институт автоматизации черной металлургии Способ правки длинномерного проката
SU1311807A1 (ru) 1985-04-30 1987-05-23 Украинский научно-исследовательский институт металлов Способ правки проката
EP0234204A2 (fr) 1986-02-21 1987-09-02 Krupp Stahl AG Procédé et dispositif pour dresser un rail du chemin de fer dans une dresseuse à rouleaux
EP0671983B1 (fr) 1992-12-02 1997-03-26 MANNESMANN Aktiengesellschaft Procede et machine-outil lineaire travaillant le metal par formage pour le dressage de pieces en forme de barre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037999A1 (fr) * 2011-09-16 2013-03-21 Siemens Aktiengesellschaft Aube de compresseur et son procédé de fabrication
CN103797134A (zh) * 2011-09-16 2014-05-14 西门子公司 压缩机叶片及其制造方法
CN103797134B (zh) * 2011-09-16 2015-11-25 西门子公司 用于制造压缩机叶片的方法
US9234429B2 (en) 2011-09-16 2016-01-12 Siemens Aktiengesellschaft Method for producing a compressor blade by forging and uniaxially stretching
CN106834639A (zh) * 2017-04-02 2017-06-13 首钢总公司 控制非调质高强螺栓钢高包辛格效应的方法

Also Published As

Publication number Publication date
ATA128998A (de) 2001-11-15
EP0976469A3 (fr) 2002-12-18
AT409230B (de) 2002-06-25

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