EP0967026A2 - Méthode de redressement de profilés métalliques - Google Patents

Méthode de redressement de profilés métalliques Download PDF

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Publication number
EP0967026A2
EP0967026A2 EP99111380A EP99111380A EP0967026A2 EP 0967026 A2 EP0967026 A2 EP 0967026A2 EP 99111380 A EP99111380 A EP 99111380A EP 99111380 A EP99111380 A EP 99111380A EP 0967026 A2 EP0967026 A2 EP 0967026A2
Authority
EP
European Patent Office
Prior art keywords
section steel
straightening
steel
profile
temperature
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.)
Granted
Application number
EP99111380A
Other languages
German (de)
English (en)
Other versions
EP0967026A3 (fr
EP0967026B1 (fr
Inventor
Hans Georg Dr.-Ing. Hartung
Lutz Dipl.-Ing. Kümmel
Bruno Dipl.-Ing. Böhmer
Wolfgang Dipl.-Ing. Roloff
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
SMS Demag AG
Schloemann Siemag AG
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 SMS Schloemann Siemag AG, SMS Demag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0967026A2 publication Critical patent/EP0967026A2/fr
Publication of EP0967026A3 publication Critical patent/EP0967026A3/fr
Application granted granted Critical
Publication of EP0967026B1 publication Critical patent/EP0967026B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling

Definitions

  • the invention relates to a method for straightening rolled Profile steel.
  • curvatures that occur are based on the prior art at low profile temperatures by one or more Straightening processes reduced to a tolerable level. For this roller straightening machines and straightening presses are used.
  • Roller straightening machines that continuously straighten profiles first a new curvature of the profile a defined measure.
  • the existing residual stresses eliminated by new defined residual stresses. In principle, however, this is not the case across the entire profile cross-section possible.
  • Remains in the area of the neutral fiber an uninfluenced throughout the straightening process Material area.
  • the product After the first bend, the product becomes one defined alternating bending (several changes in curvature).
  • the residual stresses are changed so that the profile is straight after straightening. Residual residual stresses remain in principle.
  • the invention is the Task, a method for straightening rolled To create profile steel that the material flow in the manufacture not affected by section steels and one high quality, low curvature and low internal stress Section steel supplies.
  • the invention makes use of the knowledge that the Shape of the cooled section steel essentially from that Shape and temperature distribution over the cross section of the Profile steel depends on when its hottest Areas just below the temperature Ar1 (conversion end). With strictly homogeneous temperature distribution after the complete conversion of the profile remains to this Preserved shape of the section steel at the time.
  • the invention is now based on the idea of this point in time with a homogeneous temperature distribution in the technical sense to use the cross section of the section steel to make the steel section to judge.
  • homogeneous temperature distribution all temperatures in Conversion range Ar1 - Ar3 in question.
  • Straightening the section steel can be done by stretching or upsetting respectively.
  • the section steel goes straight, without residual stress and thermally homogeneous into the alpha area. This has as a result, this state even after complete cooling is maintained up to the ambient temperature itself then when the section steel is allowed to cool down completely temporarily due to inhomogeneous cooling bends and / or builds up elastic tension.
  • the section steel is at a higher temperature in the transformation area Ar1 - Ar3 is also preferred selected the temperature at which the internal stress of the Profile steel are minimal.
  • homogeneous temperature distribution of the section steel can be by selective cooling and / or achieve heating during and / or after rolling.
  • a homogeneous temperature distribution over the Cross section can be achieved in that the temperature control is specifically influenced during the rolling of the steel.
  • a profile steel HEB 140 has an assumed initial curvature with a radius of 200 m. With the help of selective Water cooling became largely over its cross section homogeneous temperature distribution achieved at approx. 700 ° C.
  • Figure 1 shows that after cooling to ambient temperature expected residual curvature of the section steel depending the temperature at the time of straightening by stretching. It can be clearly seen that at a stretching temperature of 700 ° C no residual curvature is expected.
  • Figure 2 shows the expected maximum values of the Compression and internal tensile stress of the section steel depending from the stretching temperature.
  • the upper curve shows the to expected maximum value of the residual compressive stress, while the lower curve shows the respective maximum value of the residual tensile stress of the section steel shows.
  • Figure 2 illustrates that at a stretching temperature of 715 ° C both low pressure and residual tensile stresses also occur and at the same time the expected residual curvature is practically zero (see figure 1).
  • FIG. 3 shows a diagram corresponding to FIG a profile steel C 240, but due to its own weight was straight at first. Again, using selective Water cooling on the outside of the flange one homogeneous temperature distribution over the cross section of the profile reached at a temperature of approx. 700 ° C.
  • This profile has no curvature at stretching temperatures of 712 °, 702 ° and 570 ° C.
  • Figure 4 the one for the profile C 240 shows a diagram constructed in accordance with FIG. 2 However, it can be seen that when the residual curvature disappears should, only at 570 ° C also relatively low pressure and Residual residual stresses of the section steel are to be expected. Lesser Residual stresses - albeit with a slight tolerance Residual curvature - would be obtained if the profile C 240 were obtained stretching at a temperature above 720 ° C.
  • the application of the straightening method according to the invention is also then possible if the temperature distribution over the cross section is homogeneous, but in the longitudinal direction of the section steel varies.
  • the due to the inhomogeneous temperature curve different flow stresses along the longitudinal axis of the section steel are the same due to the different rates of deformation each other so that along the whole Profile flow with plastic flow is to be expected and not just at the lowest basic strength.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
EP99111380A 1998-06-27 1999-06-11 Méthode de redressement de profilés métalliques Expired - Lifetime EP0967026B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828785A DE19828785C2 (de) 1998-06-27 1998-06-27 Verfahren zum Richten von gewalztem Profilstahl
DE19828785 1998-06-27

Publications (3)

Publication Number Publication Date
EP0967026A2 true EP0967026A2 (fr) 1999-12-29
EP0967026A3 EP0967026A3 (fr) 2000-07-05
EP0967026B1 EP0967026B1 (fr) 2002-05-15

Family

ID=7872266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99111380A Expired - Lifetime EP0967026B1 (fr) 1998-06-27 1999-06-11 Méthode de redressement de profilés métalliques

Country Status (7)

Country Link
EP (1) EP0967026B1 (fr)
JP (1) JP4580046B2 (fr)
KR (1) KR20000006500A (fr)
AT (1) ATE217553T1 (fr)
BR (1) BR9902255A (fr)
DE (2) DE19828785C2 (fr)
TW (1) TW404858B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103537512B (zh) * 2013-10-11 2015-04-22 南阳汉冶特钢有限公司 利用常化线待温矫直挽救30mm以下瓢曲钢板的方法
JP7184022B2 (ja) 2019-11-18 2022-12-06 トヨタ自動車株式会社 鋼板部材の製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262140A1 (de) * 1972-12-19 1974-06-20 Lasalle Steel Co Verfahren zum richten von stahlhalbzeug
JPS5050262A (fr) * 1973-09-04 1975-05-06
JPS56152928A (en) * 1980-04-25 1981-11-26 Nippon Steel Corp Residual stress relieving device of h-beam
JPS611420A (ja) * 1984-06-12 1986-01-07 Kobe Steel Ltd 熱間圧延厚鋼板の強制冷却方法およびその装置
JPS6174729A (ja) * 1984-09-18 1986-04-17 Kawasaki Steel Corp フラツトバ−製造設備
JPS62235424A (ja) * 1986-04-02 1987-10-15 Kawasaki Steel Corp 形鋼のオンライン形状制御方法および装置列
EP0362122B1 (fr) * 1988-09-27 1993-03-31 MANNESMANN Aktiengesellschaft Procédé de redressage à chaud de tubes en acier
JPH08300040A (ja) * 1995-04-28 1996-11-19 Nkk Corp 厚鋼板の矯正方法
EP0807692A1 (fr) * 1996-05-15 1997-11-19 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour refroidir des poutrelles d'acier profilé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
article "VGL. STAHL UND EISEN 109,1989", pages: 171 - 176

Also Published As

Publication number Publication date
EP0967026A3 (fr) 2000-07-05
TW404858B (en) 2000-09-11
JP2000024715A (ja) 2000-01-25
DE19828785C2 (de) 2000-08-03
JP4580046B2 (ja) 2010-11-10
DE59901435D1 (de) 2002-06-20
DE19828785A1 (de) 1999-12-30
BR9902255A (pt) 2000-01-25
EP0967026B1 (fr) 2002-05-15
KR20000006500A (ko) 2000-01-25
ATE217553T1 (de) 2002-06-15

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