EP1157761A1 - Method of attaining a reduction of the rupture and tensile strength of an ultra-high strength steel blank - Google Patents

Method of attaining a reduction of the rupture and tensile strength of an ultra-high strength steel blank Download PDF

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Publication number
EP1157761A1
EP1157761A1 EP01117282A EP01117282A EP1157761A1 EP 1157761 A1 EP1157761 A1 EP 1157761A1 EP 01117282 A EP01117282 A EP 01117282A EP 01117282 A EP01117282 A EP 01117282A EP 1157761 A1 EP1157761 A1 EP 1157761A1
Authority
EP
European Patent Office
Prior art keywords
profile
rupture
blank
reduction
attaining
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Withdrawn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
EP01117282A
Other languages
German (de)
English (en)
French (fr)
Inventor
Leif Carlsson
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.)
Outokumpu Stainless AB
Original Assignee
Avesta Sheffield AB
AvestaPolarit AB
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
Priority claimed from SE9702635A external-priority patent/SE9702635D0/xx
Application filed by Avesta Sheffield AB, AvestaPolarit AB filed Critical Avesta Sheffield AB
Publication of EP1157761A1 publication Critical patent/EP1157761A1/en
Withdrawn legal-status Critical Current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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • B21D5/083—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining profiles with changing cross-sectional configuration
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/36—Making hollow objects characterised by the use of the objects collapsible or like thin-walled tubes, e.g. for toothpaste

Definitions

  • the present invention relates to a roll-shaped thin plate metal profile, the strength and/or shaping properties of which vary partially in its longitudinal direction.
  • the object of the present invention is to provide a roll-shaped metal profile of the kind mentioned above, at which the disadvantages enumerated above have been eliminated.
  • the features characterizing the invention are set out in the claims.
  • a roll-shaped thin plate metal profile which in an excellent manner fulfils its purpose and, in addition thereto, at the same time is both simple and cheap to manufacture.
  • the profile according to the invention can be manufactured both as I-beams and tubes having a circular or square cross-section. In those load cases, when the profile is clamped at its one end and the force is applied at the other end, the greater material area is at the clamped end. If the profile is loaded between two support points, the greater material cross-sectional area should be at the center.
  • the blank, from which the profile is made, or the finished profile is exposed to a partial heating to above 300°C, which produces a remaining reduction of the rupture and tensile limits of the profile material.
  • a flat blank 1 of varying width which is intended to match the strength properties desired in the completed profile 2, which is in detail and in cross-section illustrated in Fig. 2.
  • This profile 2 is intended to form a post or a strut for e.g. a vehicle and the flat blank 1 of the profile 2 does at its base 3 have a width greater than that at its top portion 4.
  • the completed post or tube will have its greatest strength at the lower portion, or mounting portion, where the stress is highest, in the case that the post or strut is to be used to support e.g. a road sign or as a strut in a vehicle or the like.
  • the upper portion 4 of the profile 2, where the stresses are not so high, has been made weaker. In this way there has been provided a profile 2, which both has a lower weight and where the material consumption is lower compared with conventional profiles having a uniform cross-sectional profile.
  • Figs. 3 and 4 illustrate an alternative embodiment relating to a blank 7 and its profile 5 forming an I-beam to be used in the back support of a motor car chair, in which the highest stress in the profile 5 is at the mounting end 6.
  • Figs. 5 and 6 show an alternative embodiment, according to which the blank 11 for the profile 10 is tubular and exhibits inwardly folded portions 8, 9, the extension of which in the transverse direction of the profile 10 varies in the longitudinal direction. Consequently, also in this embodiment material is conserved, the strength of the profile 5, 10 being highest in the places where it is most exposed to forces.
  • the tubular profiles 2, 5, 10 having a non-linear material content one has thus attained a lower weight completely or partly maintaining the strength against bending stresses.
  • the profile 2, 5, 10 When the profile 2, 5, 10 is manufactured it is shaped starting from a flat metallic blank 1, 7, 11 in long, rolled strips, which are cut before or after having been given a roll profile.
  • the profile 2, 5, 10 can also be manufactured from prestamped blanks of formate sheet. If the roll profiling starts from a strip, the width thereof can be varied in a non-linear manner in the way that material is separated by cutting, stamping, nibbling or by different shearing methods. If the roll profiling starts from blanks, the width thereof can be varied according to the methods described above.
  • Roll-shaped profiles 2, 5, 10 of an ultrahigh stress steel having a tensile limit above e.g. 700 N/mm 2 must partially be given a greater plastic deformation than that which the starting material tolerates without rupturing. According to the invention this can be achieved in the way that the blank, or the completed profile, is partially heated to above 300°C, resulting in a remaining reduction of the rupture and tensile limits, which facilitates a subsequent shaping.
  • This shaping may consist in e.g. a bending of the profile or in a punching or embossment of the material, which process is then facilitated.
  • the heating can be carried out according to different methods, e.g. induction heating, laser heating or with the use of hot dies. In certain cases it could also be suitable to heat portions of the completed profile 2, 5, 10 in order to attain a reduction of the rupture and tensile limits in preparation of a subsequent treatment.
  • the thickness difference between plates to be welded together butt to butt must not be too great.
  • the thickness ratio 1:2 is suitable.
  • the critical parameter is not the thickness but rather the strength of the material. The reason for this is that such sheets have a strength about 6 times that of an ordinary, soft sheet. To get a smooth transition between the materials one can heat the ultrahigh strength steel sheet at the transition to the ordinary, soft sheet to a temperature above 300°C in locations along all of the edge secured to the soft sheet.
  • this partial heating is used on the one hand to facilitate a subsequent treatment of the ultrahigh strength steel and, on the other, to achieve a soft transition in the weld joint between it and an ordinary, soft sheet. If this treatment is not carried out the weld joint will rupture due to the different strength properties of the two materials.
  • a partial heating of the ultrahigh strength sheet is also carried out in such portions of the sheet which shall be adapted to serve as deformation zones in e.g. vehicles. This is done to diminish the damages, which otherwise would occur upon a collision, namely if certain exposed portions of a vehicle are more easily deformed than other portions also consisting of that ultrahigh strength material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Powder Metallurgy (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Coating With Molten Metal (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Body Structure For Vehicles (AREA)
EP01117282A 1997-07-04 1998-07-06 Method of attaining a reduction of the rupture and tensile strength of an ultra-high strength steel blank Withdrawn EP1157761A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9702635A SE9702635D0 (sv) 1997-07-04 1997-07-04 Rullformad metallprofil av tunnplåt
SE9702635 1997-07-04
SE9703445A SE512543C2 (sv) 1997-07-04 1997-09-24 Rullformad metallprofil av tunnplåt
SE9703445 1997-09-24
EP98934043A EP1011891B1 (en) 1997-07-04 1998-07-06 Roll-formed metal profile of thin sheet

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP98934043A Division EP1011891B1 (en) 1997-07-04 1998-07-06 Roll-formed metal profile of thin sheet

Publications (1)

Publication Number Publication Date
EP1157761A1 true EP1157761A1 (en) 2001-11-28

Family

ID=26663032

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01117282A Withdrawn EP1157761A1 (en) 1997-07-04 1998-07-06 Method of attaining a reduction of the rupture and tensile strength of an ultra-high strength steel blank
EP98934043A Expired - Lifetime EP1011891B1 (en) 1997-07-04 1998-07-06 Roll-formed metal profile of thin sheet

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP98934043A Expired - Lifetime EP1011891B1 (en) 1997-07-04 1998-07-06 Roll-formed metal profile of thin sheet

Country Status (6)

Country Link
EP (2) EP1157761A1 (ja)
JP (1) JP4173277B2 (ja)
AT (1) ATE249898T1 (ja)
DE (1) DE69818281T2 (ja)
SE (1) SE512543C2 (ja)
WO (1) WO1999001242A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012059233A1 (de) * 2010-11-03 2012-05-10 Johnson Controls Gmbh Verfahren zum rollformen von profilen und dadurch hergestelles strukturteil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2035169A (en) * 1978-11-28 1980-06-18 British Steel Corp Roll forming of metal
JPS59206118A (ja) * 1983-05-10 1984-11-21 Nippon Kokan Kk <Nkk> 薄板の成形方法
US5080412A (en) * 1991-04-22 1992-01-14 Chrysler Corporation Vehicle and bumper beam combination

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB800780A (en) * 1955-08-16 1958-09-03 Baas Erwin A method for producing a hollow beam, and improvements in and relating to a beam andloading means produced in accordance with such method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2035169A (en) * 1978-11-28 1980-06-18 British Steel Corp Roll forming of metal
JPS59206118A (ja) * 1983-05-10 1984-11-21 Nippon Kokan Kk <Nkk> 薄板の成形方法
US5080412A (en) * 1991-04-22 1992-01-14 Chrysler Corporation Vehicle and bumper beam combination

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BERGMANN H.W.; ELTZE K.: "Annealing by Laser Treatment", CONFERENCE LASER TREATMENT OF MATERIALS, 1986, pages 419, XP002968643
CONFERENCE LASER TREATMENT OF MATERIALS, 1986, BAD NAUHEIM, pages 419 - 425
DATABASE METADEX [online] BERGMANN H.W.; ELTZE K.: "Annealing by Laser Treatment", XP002968642

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012059233A1 (de) * 2010-11-03 2012-05-10 Johnson Controls Gmbh Verfahren zum rollformen von profilen und dadurch hergestelles strukturteil
JP2013544190A (ja) * 2010-11-03 2013-12-12 ジョンソン・コントロールズ・ゲー・エム・ベー・ハー 外形の圧延成形方法及びこれにより製造される構造部品

Also Published As

Publication number Publication date
DE69818281D1 (de) 2003-10-23
SE512543C2 (sv) 2000-04-03
EP1011891B1 (en) 2003-09-17
JP2001515790A (ja) 2001-09-25
SE9703445L (sv) 1999-01-05
ATE249898T1 (de) 2003-10-15
SE9703445D0 (sv) 1997-09-24
DE69818281T2 (de) 2004-07-22
JP4173277B2 (ja) 2008-10-29
WO1999001242A1 (en) 1999-01-14
EP1011891A1 (en) 2000-06-28

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