EP2959985A2 - Poutre profilée en feuillard laminé à froid ayant une résistance à la flexion accrue et son procédé de production - Google Patents

Poutre profilée en feuillard laminé à froid ayant une résistance à la flexion accrue et son procédé de production Download PDF

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Publication number
EP2959985A2
EP2959985A2 EP15000717.7A EP15000717A EP2959985A2 EP 2959985 A2 EP2959985 A2 EP 2959985A2 EP 15000717 A EP15000717 A EP 15000717A EP 2959985 A2 EP2959985 A2 EP 2959985A2
Authority
EP
European Patent Office
Prior art keywords
thickness
material thickness
region
steel strip
increased
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
EP15000717.7A
Other languages
German (de)
English (en)
Other versions
EP2959985A3 (fr
EP2959985B1 (fr
Inventor
Janina Wolf
Mario Schmidt
Dieter Krech
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.)
Bilstein GmbH and Co KG
Original Assignee
Bilstein GmbH and Co KG
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 Bilstein GmbH and Co KG filed Critical Bilstein GmbH and Co KG
Publication of EP2959985A2 publication Critical patent/EP2959985A2/fr
Publication of EP2959985A3 publication Critical patent/EP2959985A3/fr
Application granted granted Critical
Publication of EP2959985B1 publication Critical patent/EP2959985B1/fr
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Anticipated expiration legal-status Critical

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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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/006—Blanks having varying thickness, e.g. tailored blanks
    • 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
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets

Definitions

  • the invention relates to a method for producing profiled carrier with an increased bending strength according to the preamble of claim 1.
  • the flexural strength of the structural beams is significantly increased by the spatial deformation of the material compared to flat material, it is desirable in view of the increasing tendency in recent years to reduce the weight of motor vehicles and the ever increasing safety requirements, the flexural strength of such profile beam at a given weight of each component without increasing the cost of manufacturing the components, for example, by the use of higher quality materials.
  • the profile carrier produced by the method according to the invention is preferably made of cold-rolled steel sheet, i. so-called cold strip, which has a substantially homogeneous material thickness at the beginning of the manufacturing process.
  • the profile carrier is preferably used as a side impact protection in a motor vehicle, it is basically also suitable for use in other applications, for example as a carrier in a supporting structure of a building or structure, such as a skyscraper, a bridge or dome.
  • the profile carrier according to the invention in this case has in the simplest embodiment, a substantially U-shaped cross-sectional shape with a first force application surface on which at least a first and a second extending at an angle to the force application surface web are arranged, which extend over the length of the profile carrier away.
  • a force application surface this is the surface of the carrier to be designated, at which an external force acts on the carrier.
  • the back of the U-profile which is e.g. in the case of a side impact protection in a car first comes in contact with the colliding vehicle.
  • the profile carrier according to the invention is in this case clamped in the case of a side impact protection at its ends, which can be done for example by welding to the upper and lower door spar.
  • the profile carrier in the basic embodiment described above is prepared by first a steel strip is fed with a substantially constant initial thickness of a pair of rollers, which alternately adjacent areas having different diameters, such that the steel strip after the rolling to different thicknesses one of the first force application surface associated region having an increased material thickness and a first and second on both sides of this area subsequent region having a reduced material thickness, which are associated with the first and second web.
  • the rolled to different thicknesses steel strip spatially deformed in particular by forming rollers in such a way that the areas with reduced material thickness with formation of the webs, which correspond to the two legs of the U-shaped cross section in the basic embodiment of the profile carrier, preferably parallel to each other and preferably at right angles to the area extend enlarged material thickness, which corresponds in this case the back of the U-shaped profile carrier.
  • rollers instead of forming rollers, however, it is also possible that cut to different thicknesses rolled metal strip after rolling in blanks and then transform it by a press in the spatial shape of the profile carrier.
  • the invention provides the advantage that the flexural strength of the tread carrier due to the additional material in the region of increased material thickness, i. in the region of the back of the U-shaped support, compared to a support which is made of the same material with a constant material thickness, disproportionately increased.
  • This additional gain in flexural strength is obtained not only by virtue of the fact that the thickened region as such has a larger area moment of inertia overall, but by virtue of the fact that this region, due to its increased thickness, can absorb higher thrust forces as a whole, which acts on the force application surface upon application of a force in the normal direction act within the material of the force application surface in the longitudinal direction of the carrier, without causing distortions of the material.
  • the material due to the opposite of the other two areas not or less strongly work hardened thickened area can be significantly better shape, as the material in the corner areas during the forming process Simply put, it is pulled out of the softer and more ductile material of the thickened back area.
  • the material flows during the forming process from the adjacent work hardened areas, which form the legs / webs of the finished shaped support, almost not, so that they do not constrict or are otherwise adversely deformed.
  • the rolling of the steel strip to different thicknesses further comprises the production of a second region of increased material thickness adjoining the second region of reduced material thickness and of a second force application surface, and a third region of reduced material thickness adjoining the second region.
  • the forming includes bending the second region of increased material thickness at a preferably right angle to the adjacent second region of reduced material thickness and bending the third region of reduced material thickness at a preferably also right angle to the second region of increased thickness , so that a profile carrier is formed with a substantially S-like cross-section.
  • the latter accordingly has two force application surfaces which are offset and arranged parallel to each other and are interconnected by a central web formed by the second region of reduced material thickness.
  • the rolling of the steel strip to different thicknesses further comprises the production of a third region with an increased material thickness which adjoins the third region of reduced material thickness and a third force application surface and a fourth region adjoins this with a reduced thickness material thickness.
  • a forming device such as forming rollers, a folding device or a press reshaped so that the third area with increased material thickness at right angles to the adjacent third area with reduced material thickness and the fourth area with Reduced material thickness at right angles to the third region with increased thickness run, so that a profile carrier is formed with a cross section which has the shape of two spaced-apart inverted U's, whose adjacent legs are interconnected by a horizontal bar.
  • the profile carrier according to the invention produced in this way has compared to the previously described embodiments, a further increased flexural strength, the two horizontally extending first and third force application surfaces when used as a side impact protection in a motor vehicle preferably to the outside of the vehicle facing to the colliding vehicle first in Get in touch.
  • This embodiment of the profile carrier according to the invention has the advantage that the forces acting on impact on an overall enlarged surface attack the carrier, which in conjunction with the two additional inner webs of thin-walled cold-worked material, the risk of local buckling of the profile carrier is further reduced.
  • the transitions between the sections of increased thickness and the sections of reduced thickness after the rolling of the steel strip and prior to the forming thereof are designed sharp-edged.
  • the transitions between the sections of increased thickness and the sections of reduced thickness after the rolling of the steel strip have a continuous course, ie an edgeless transition.
  • a particular advantage of this embodiment is that the material can flow out of the intermediate areas or transition areas during the forming process, which causes the Facilitated transformation process and reduces the risk of cracking in the area of the rounded longitudinal edges.
  • the rolling of the steel strip to different thicknesses in the preferred embodiment of the invention by a roller with an open caliber , As a result, the material thickness is not changed in the region or regions with increased thickness during the rolling, so that these areas have a significantly higher ductility or formability compared to the adjacent rolled, work-hardened areas.
  • the forming process is facilitated by the fact that the ductility of the thickened area can be adjusted with high accuracy by an appropriate selection of the starting material, since the use of an open caliber no strain hardening occurs in this area and the material in this area therefore his maintains original characteristics.
  • forming the rolled steel strip comprises drawing a collar and / or ironing the material in at least one of the regions of increased material thickness. Due to the fact that the material in the areas with enlarged Material thickness according to the invention a significantly greater ductility than in the adjacent cold-strengthened areas, and also more material is available due to the greater thickness, which can flow when pulling out a collar, there is the advantage that cut into the collar thus produced, for example, thread can be about which can be screwed by means of suitable screws other components directly to the outside of the profile carrier according to the invention, without the need for additional nuts or the like must be welded to the workpiece, as is required in conventionally manufactured profile carriers. Similarly, projections or beads can be introduced by stretching the material in the areas of increased thickness, which can also serve for the direct attachment of other components, or for the positive connection of a profile carrier produced by the process according to the invention with other components.
  • hot-rolled strip may alternatively be used as the starting material.
  • the supplied steel strip is unwound from a coil, fed to a previously described rolling device and subsequently the steel strip rolled off to different thicknesses rolled up into a coil.
  • the coiled coils can then be transported directly to the forming operations and unwound there again and by appropriate forming devices, such as. continuously and successively transferred to the webs and spine forming rollers in the final shape of the Pofillini and then cut to length by a suitable cutter to the desired length.
  • Fig. 1e comprises a profile carrier produced by the process according to the invention 1 with a U-shaped cross-section a first, as a back designated force application surface 40a, from which two legs, also referred to as webs 60a and 60b extend at right angles and parallel to each other.
  • the first force application surface 40a is a surface into which a force indicated by the arrow F is introduced, such as the impact forces that are exerted on the carrier 1 in the event of a collision by a foreign vehicle, if this as impact protection in the door or Roof area of a motor vehicle not shown in detail is used.
  • a steel strip 2 having a substantially constant initial thickness is first fed to a pair of rollers 3a, 3b, of which the lower roller 3b has a constant diameter and the upper roller 3 has two outer sections 5v and an intermediate section 5r with a reduced diameter , Through the in Fig. 1b indicated rolling of the steel strip 2 is formed in this in the section 5r one of the first force application surface 40a associated region 4a with increased material thickness, in which the starting material was not or only slightly rolled off.
  • the material in these two regions 6a, 6b with a reduced material thickness has a considerably higher strength than in the region 4a.
  • the rolled to its final thickness steel strip 2 ( Fig. 1c ) is subsequently removed from the rollers 3a, 3b and fed to a forming device, which in Fig. 1d is symbolized by three forming rollers 7a, 7b and 7c.
  • the first and the second region of reduced material thickness 6a, 6b which are assigned to the webs or legs 60a, 60b in the profile carrier 1, are angled relative to the first region of increased material thickness 4a, which is assigned to the force application surface 40a, preferably angled 90 °, to bring the carrier 1 in its final form.
  • a profile carrier 1 according to the invention is shown, which is preferably used as a side impact protection in a car.
  • a fourth web or leg 60d extends parallel to the first web or leg 60a, resulting in a profile carrier having the shape, viewed in cross-section, of two (inverted) U's joined together via the second force-engaging surface 40 ,
  • a steel strip 2 having a substantially constant initial thickness is inserted into the FIGS. 2a and 2b shown pair of rollers 30a, 30b, of which the lower roller 30b has a central portion 50r with a reduced diameter, to which connect on both sides two portions 50v with an enlarged diameter.
  • the upper roller 30a has a larger diameter central portion 50v and two reduced diameter portions 50r adjacent thereto, each of which is followed by a larger diameter portion 50v, as shown in FIG Fig. 2a and 2b is shown.
  • Fig. 2b indicated rolling of the steel strip 2 is formed in Fig.
  • Fig. 2c shown steel strip 2 by a forming device not shown in detail, for example, by means of successively acting at different locations Profilierwalzen, transferred to the final shape shown in Fig. 2d, in which the areas 4a, 4b and 4c to the first, second and third force application surface 40a , 40b and 40c, and the regions 6a to 6c are associated with the first to fourth lands 60a to 60d.
  • Fig. 3d a further embodiment of a profile carrier according to the invention 1 shown, in which the first force-engaging surface 4a has rounded longitudinal edges on its upper side.
  • Fig. 3b After rolling off the steel strip ( Fig. 3b ) results in a Fig. 3c shown profiled steel strip 2, which in the subsequent thereto by molding rolls or the like.
  • Fig. 3d shown end shape of the profile carrier is transformed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Rod-Shaped Construction Members (AREA)
EP15000717.7A 2014-06-27 2015-03-11 Poutre profilée en feuillard laminé à froid ayant une résistance à la flexion accrue et son procédé de production Active EP2959985B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014009334.4A DE102014009334A1 (de) 2014-06-27 2014-06-27 PROFlLTRÄGER MlT ElNER ERHÖHTEN BlEGEFESTlGKElT AUS KALTBAND SOWlE VERFAHREN ZUR HERSTELLUNG ElNES SOLCHEN

Publications (3)

Publication Number Publication Date
EP2959985A2 true EP2959985A2 (fr) 2015-12-30
EP2959985A3 EP2959985A3 (fr) 2016-01-06
EP2959985B1 EP2959985B1 (fr) 2019-06-12

Family

ID=52780746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15000717.7A Active EP2959985B1 (fr) 2014-06-27 2015-03-11 Poutre profilée en feuillard laminé à froid ayant une résistance à la flexion accrue et son procédé de production

Country Status (3)

Country Link
EP (1) EP2959985B1 (fr)
DE (1) DE102014009334A1 (fr)
ES (1) ES2744863T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106734333A (zh) * 2016-12-19 2017-05-31 武汉理工大学 一种异形截面管的冷轧成形装置及方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085829A (en) * 1935-05-08 1937-07-06 Harry E Rogers Method of making beams
LU41254A1 (fr) * 1961-02-22 1962-04-14
US3850019A (en) * 1972-11-28 1974-11-26 Anaconda American Brass Co Method of producing a metal strip including a longitudinal channel by roll-form reduction of a multi-gage strip
DE10113610C2 (de) * 2001-03-20 2003-04-17 Reiner Kopp Verfahren und Walzvorrichtung zur Ausbildung von dickenprofiliertem einstückigem Walzgut
EP1442807A1 (fr) * 2003-01-29 2004-08-04 Peiner Träger GmbH Procédé de fabrication d'un profilé de construction avec une section creuse fermée et profilé de construction ainsi obtenu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106734333A (zh) * 2016-12-19 2017-05-31 武汉理工大学 一种异形截面管的冷轧成形装置及方法

Also Published As

Publication number Publication date
ES2744863T3 (es) 2020-02-26
DE102014009334A1 (de) 2016-01-28
EP2959985A3 (fr) 2016-01-06
EP2959985B1 (fr) 2019-06-12

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