EP1011891B1 - Roll-formed metal profile of thin sheet - Google Patents
Roll-formed metal profile of thin sheet Download PDFInfo
- Publication number
- EP1011891B1 EP1011891B1 EP98934043A EP98934043A EP1011891B1 EP 1011891 B1 EP1011891 B1 EP 1011891B1 EP 98934043 A EP98934043 A EP 98934043A EP 98934043 A EP98934043 A EP 98934043A EP 1011891 B1 EP1011891 B1 EP 1011891B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- blank
- strength
- roll
- metal profile
- 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
Links
Images
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 (see for example GB-A-800780).
- 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 claim 1.
- the dependent claims describe preferred embodiments of the invention. Thanks to the invention there has now been provided 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 it becomes possible to match the width of the flat blank, from which the profile is made, to the relevant stress. In this way the weight can be reduced with maintained bending stress strength.
- the profile according to the invention can be manufactured both as I-beams and tubes having a circular or square cross-section.
- 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. In order to facilitate a finishing shaping or machining of the profile either 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.
Abstract
The present invention refers to a method for attaining a reduction of the rupture and tensile limit of a blank or profile of an ultra-high strength material. According to the method the blank or profile is exposed to a heat treatment by heating to above 300 DEG C within selected portions of the sheet. <IMAGE>
Description
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 (see for example GB-A-800780).
The material content of roll-shaped profiles available
today does, in its longitudinal direction, exhibit
constant strength and/or shaping properties. Accordingly,
these prior art profiles have a strength, which is
constant along all of its length, which per se is not a
disadvantage in most applications. However, in the
fields where e.g. the weight of the profiles may be of
importance, e.g. within the aircraft and motor car
industry, this is a drawback, since it is not necessary
for the profile to have the same strength and shaping
properties along all of its length. Instead, in those
cases it would be enough if the profile had a sufficient
strength corresponding to the calculated load or
stress. It has also proved difficult, when the roll-shaped
profiles consist of ultrahigh strength steel,
later to carry out some form of shaping, e.g. embossing
on the surface of the profile, bending it or carrying
out a subseguent punching of the material.
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 claim 1. The dependent claims
describe preferred embodiments of the invention.
Thanks to the invention there has now been provided 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. By use of the profile according to the
invention it becomes possible to match the width of the
flat blank, from which the profile is made, to the
relevant stress. In this way the weight can be reduced
with maintained bending stress strength. 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. In order to facilitate a
finishing shaping or machining of the profile either
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.
Some chosen preferred embodiments of the invention will
now be described with reference to the drawing, in
which
- Fig. 1
- shows a profile blank having varying width and used to produce a profile in the shape of a tube according to the invention,
- Fig. 2
- shows a completed tube or post according to the invention made from the profile blank in Fig. 1, four different cross-sections through the tube being illustrated,
- Fig. 3
- shows an alternative embodiment of a blank for a profile constituted by an I-beam,
- Fig. 4
- shows, at four different cross-sections, a roll-shaped profile in the form of an I-beam made from the blank in Fig. 3,
- Fig. 5
- shows a cross-section through a profile, which according to the invention has been given a tubular shape, and
- Fig. 6
- shows in a compacted manner the roll-forming steps starting from a blank exhibiting a varying width and generating the profile shown in Fig. 5.
As appears more in detail from the embodiment of the
invention illustrated in Figs. 1 and 2, one has here
started from 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.
In this way 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. In the above-mentioned 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. 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/mm2 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.
In the motor car manufacturing industry the thickness
difference between plates to be welded together butt to
butt must not be too great. The thickness ratio 1:2 is
suitable. However, in the use of sheets of a high-stress
material having a tensile limit exceeding 700
N/mm2, 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. Accordingly,
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.
Claims (3)
- A roll-shaped thin sheet metal profile with partially along its longitudinal direction varying strength and/or shaping properties, characterized in that the flat blank (1, 7, 11) creating the profile (2, 5, 10) is constituted by an ultrahigh strength steel having a heightened rupture and tensile limit, the width of the blank varying along the longitudinal direction and being selected to match a relevant strength property, whereby said width of the blank is adapted in response to the required profile strength.
- A metal profile according to claim 1, characterized in that the blank (1, 7, 11) or the completed profile (2, 5, 10) has been exposed to a heat treatment by partial heating to above 300°C within selected portions of the sheet in order to produce a remaining reduction of the rupture and tensile limit to facilitate a subsequent shaping or to produce deformation zones.
- A metal profile according to claim 2, characterized in that said tensile strength amounts to above 700 N/mm2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01117282A 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 |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9702635 | 1997-07-04 | ||
| SE9702635A SE9702635D0 (en) | 1997-07-04 | 1997-07-04 | Roll-shaped metal profile of sheet metal |
| SE9703445A SE512543C2 (en) | 1997-07-04 | 1997-09-24 | Roll-shaped metal profile of sheet metal |
| SE9703445 | 1997-09-24 | ||
| PCT/SE1998/001329 WO1999001242A1 (en) | 1997-07-04 | 1998-07-06 | Roll-formed metal profile of thin sheet |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01117282A Division 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1011891A1 EP1011891A1 (en) | 2000-06-28 |
| EP1011891B1 true EP1011891B1 (en) | 2003-09-17 |
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 Before (1)
| 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 |
Country Status (6)
| Country | Link |
|---|---|
| EP (2) | EP1157761A1 (en) |
| JP (1) | JP4173277B2 (en) |
| AT (1) | ATE249898T1 (en) |
| DE (1) | DE69818281T2 (en) |
| SE (1) | SE512543C2 (en) |
| WO (1) | WO1999001242A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130316187A1 (en) * | 2010-11-03 | 2013-11-28 | Johnson Controls Gmbh | Method for the roll-forming of profiles and a structural part produced thereby |
Family Cites Families (4)
| 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 |
| GB2035169B (en) * | 1978-11-28 | 1982-06-16 | British Steel Corp | Roll forming of metal |
| JPS59206118A (en) * | 1983-05-10 | 1984-11-21 | Nippon Kokan Kk <Nkk> | Forming method of thin sheet |
| US5080412A (en) * | 1991-04-22 | 1992-01-14 | Chrysler Corporation | Vehicle and bumper beam combination |
-
1997
- 1997-09-24 SE SE9703445A patent/SE512543C2/en not_active IP Right Cessation
-
1998
- 1998-07-06 EP EP01117282A patent/EP1157761A1/en not_active Withdrawn
- 1998-07-06 EP EP98934043A patent/EP1011891B1/en not_active Expired - Lifetime
- 1998-07-06 DE DE69818281T patent/DE69818281T2/en not_active Expired - Lifetime
- 1998-07-06 JP JP2000500994A patent/JP4173277B2/en not_active Expired - Fee Related
- 1998-07-06 AT AT98934043T patent/ATE249898T1/en active
- 1998-07-06 WO PCT/SE1998/001329 patent/WO1999001242A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| DE69818281D1 (en) | 2003-10-23 |
| ATE249898T1 (en) | 2003-10-15 |
| JP2001515790A (en) | 2001-09-25 |
| WO1999001242A1 (en) | 1999-01-14 |
| EP1011891A1 (en) | 2000-06-28 |
| SE9703445L (en) | 1999-01-05 |
| SE9703445D0 (en) | 1997-09-24 |
| DE69818281T2 (en) | 2004-07-22 |
| EP1157761A1 (en) | 2001-11-28 |
| JP4173277B2 (en) | 2008-10-29 |
| SE512543C2 (en) | 2000-04-03 |
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