EP0434499A1 - Verfahren zum Herstellen eines nichtabwickelbaren Formteils aus einer flachen Metallplatte und so hergestelltes Formteil - Google Patents

Verfahren zum Herstellen eines nichtabwickelbaren Formteils aus einer flachen Metallplatte und so hergestelltes Formteil Download PDF

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Publication number
EP0434499A1
EP0434499A1 EP90403513A EP90403513A EP0434499A1 EP 0434499 A1 EP0434499 A1 EP 0434499A1 EP 90403513 A EP90403513 A EP 90403513A EP 90403513 A EP90403513 A EP 90403513A EP 0434499 A1 EP0434499 A1 EP 0434499A1
Authority
EP
European Patent Office
Prior art keywords
developable
perforations
shape
sheet blank
sheet
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Withdrawn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
EP90403513A
Other languages
English (en)
French (fr)
Inventor
Gabriel Ferdinand De Smet
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0434499A1 publication Critical patent/EP0434499A1/de
Withdrawn legal-status Critical Current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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves

Definitions

  • the subject of the present invention is a process for producing a part of non-developable shape from a sheet blank, in particular for producing corner zones of fallen edges.
  • the invention also relates to a non-developable part obtained by this process.
  • the sheet blank is held at the peripheral part and is acted on the central part of the latter under the action of lowering or raising a punch which gradually deforms the blank by falling the peripheral edge.
  • the peripheral part undergoes shrinking taking into account the reduction in the perimeter from the outside.
  • One is therefore led to avoid the formation of folds, in particular in the corner areas, to increase the pressure under blank holder which leads to increasing the tensile force exerted by the central part.
  • This process can be carried out with a sheet blank made of a malleable material.
  • this known method is inapplicable for certain shaping of materials which do not have good elongation characteristics, in particular in the case of thin sheets made of material having a low coefficient of elongation or in the case where the geometry does not does not allow wrinkles to form.
  • Another known method of forming a sheet blank consists of heating the sheet blank to make it more ductile and therefore promote deformation under less effort.
  • the heating has the drawback of causing the oxidation of the parts obtained and of requiring pickling.
  • the object of the invention is to provide a cold process for the production of a part of non-developable shape, from a sheet metal blank of small thickness, avoiding the aforementioned drawbacks such as, for example, hot deformation, or by remedying the problem of shaping thin, slightly ductile sheet metal.
  • the perforations are made on the sheet blank in the corner areas of the fallen edges.
  • perforations are made on the sheet metal blank between the corner zones in determined places and places where the falling of the edge generates an excess of length of said edge.
  • the invention also relates to a part of non-developable shape produced according to the method mentioned above.
  • Fig. 1 represents a part of non-developable shape made from a sheet blank 1 extraminate according to a known production process.
  • the shape envisaged is substantially that of a trihedron obtained by the folding of the edges 2 and 3.
  • edges 2 and 3 creates, in the constricted areas and in particular in the corner area 4, an excess of material increasing from the corner 5 towards the edge 6 so that the sheet forming the fallen edge is subjected to compression.
  • This compression generates folds 7 which result from the buckling of the excess material created by the shaping of the part.
  • the excess volume due to this simulated deformation is determined by difference.
  • arrays of perforations are defined to remove before deforming an amount of material corresponding to the excess of volume thus determined ( Fig. 4).
  • the network of perforations 60 comprises a central zone 50 corresponding to the right angle ⁇ determining the angle zone 40 and, on each side of this central zone 50, a transition zone 51a and 51b respectively ensuring the connection between the perforated central zone 50 and the non-perforated dropped edges 20 and 30.
  • the perforations 60 are distributed as a function of their number, dimension and geometric shape.
  • Fig. 2 also shows a network of perforations 70, the networks of perforations 70 are distributed so as to absorb an excess of length of the fallen edge, for example at the locations where ribs or notches could be placed.
  • the compression forces developed for example in a press deform said sheet blank.
  • the voids formed by the perforations (60, 70) are erased when the edges of the perforations are brought together, which makes it possible to avoid uncontrolled deformations while maintaining a substantially constant thickness of said sheet blank, and by achieving a relative continuity of matter.
  • the perforations (60, 70) produced in the constricted areas have a suitable geometric shape such as, for example, oblong or polygonal and are distributed in number or in increasing area from the base towards the end of the fallen edge.
  • corner area 40 has two edges defining between them a cutaway 41 (FIGS. 5 and 6)
  • said corner area 40 comprises two networks of perforations 60 on either side of the cutaway 41 , i.e. in shrunken areas.
  • Each network of perforations 60 has a shape identical to that defined in FIG. 2 for a corner area with an edge and the perforations 60 are distributed according to their number, size and geometric shape.
  • arrays of perforations are defined to remove before deformation an amount of material corresponding to the excess volume thus determined.
  • the voids formed by the perforations (60, 70) are erased during the shaping of the sheet blank 10, which makes it possible to avoid uncontrolled deformations while maintaining a substantially constant thickness of said blank of sheet metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
EP90403513A 1989-12-18 1990-12-10 Verfahren zum Herstellen eines nichtabwickelbaren Formteils aus einer flachen Metallplatte und so hergestelltes Formteil Withdrawn EP0434499A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916724 1989-12-18
FR8916724A FR2655890A1 (fr) 1989-12-18 1989-12-18 Procede d'elaboration d'une piece de forme non developpable a partir d'un flan de tole et piece de forme obtenue par ce procede.

Publications (1)

Publication Number Publication Date
EP0434499A1 true EP0434499A1 (de) 1991-06-26

Family

ID=9388632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403513A Withdrawn EP0434499A1 (de) 1989-12-18 1990-12-10 Verfahren zum Herstellen eines nichtabwickelbaren Formteils aus einer flachen Metallplatte und so hergestelltes Formteil

Country Status (10)

Country Link
EP (1) EP0434499A1 (de)
JP (1) JPH03268823A (de)
KR (1) KR910011410A (de)
CN (1) CN1053761A (de)
CA (1) CA2032444A1 (de)
FI (1) FI906210L (de)
FR (1) FR2655890A1 (de)
HU (1) HU205727B (de)
PL (1) PL288312A1 (de)
YU (1) YU237090A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0672477A1 (de) * 1994-03-19 1995-09-20 Helmut W. Diedrichs Umformverfahren zum Drücken von Blechformteilen
DE4303300B4 (de) * 1993-02-05 2007-02-01 Diedrichs, Helmut W. Umformverfahren zum Drücken von Blechformteilen
CN100377804C (zh) * 2004-09-13 2008-04-02 上海宝钢工业公司 钢卷外护圈折弯、冲孔复合工艺及其模具
EP2837439A3 (de) * 2013-08-16 2015-04-08 Rolls-Royce plc Verfahren zur Verminderung von Falten in gepressten Blechkomponenten

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104438523B (zh) * 2014-12-15 2016-03-30 安徽江淮汽车股份有限公司 冲压件翻边方法
CN106984687B (zh) * 2017-04-07 2018-07-31 艾柯豪博（苏州）电子有限公司 网板材料拉伸网孔不变形工艺
JP6981502B2 (ja) * 2020-05-23 2021-12-15 Ｊｆｅスチール株式会社 プレス成形金型、プレス成形方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262059A (en) * 1978-05-22 1981-04-14 Frankowski Leo A Method for making a thin-walled object
DE3540151A1 (de) * 1984-11-14 1986-05-28 VEB Kombinat Feuerlöschgeräte Neuruppin, DDR 1950 Neuruppin Verfahren zur herstellung von rotationssymmetrischen hohlformteilen aus drahtsiebmaterial

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61189828A (ja) * 1985-02-16 1986-08-23 Toyota Motor Corp ヘミング加工方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262059A (en) * 1978-05-22 1981-04-14 Frankowski Leo A Method for making a thin-walled object
DE3540151A1 (de) * 1984-11-14 1986-05-28 VEB Kombinat Feuerlöschgeräte Neuruppin, DDR 1950 Neuruppin Verfahren zur herstellung von rotationssymmetrischen hohlformteilen aus drahtsiebmaterial

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 14 (M-553)[2461], 14 janvier 1987; & JP-A-61 189 828 (TOYOTA) 23-08-1986 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303300B4 (de) * 1993-02-05 2007-02-01 Diedrichs, Helmut W. Umformverfahren zum Drücken von Blechformteilen
EP0672477A1 (de) * 1994-03-19 1995-09-20 Helmut W. Diedrichs Umformverfahren zum Drücken von Blechformteilen
CN100377804C (zh) * 2004-09-13 2008-04-02 上海宝钢工业公司 钢卷外护圈折弯、冲孔复合工艺及其模具
EP2837439A3 (de) * 2013-08-16 2015-04-08 Rolls-Royce plc Verfahren zur Verminderung von Falten in gepressten Blechkomponenten

Also Published As

Publication number Publication date
FI906210A7 (fi) 1991-06-19
CN1053761A (zh) 1991-08-14
KR910011410A (ko) 1991-08-07
FI906210A0 (fi) 1990-12-17
PL288312A1 (en) 1991-12-02
YU237090A (sh) 1994-11-15
CA2032444A1 (fr) 1991-06-19
HUT57090A (en) 1991-11-28
FR2655890A1 (fr) 1991-06-21
JPH03268823A (ja) 1991-11-29
HU205727B (en) 1992-06-29
FI906210L (fi) 1991-06-19
HU908238D0 (en) 1991-06-28

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