EP3297777B1 - Formen von halboffenen metallstanzteilen - Google Patents

Formen von halboffenen metallstanzteilen Download PDF

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Publication number
EP3297777B1
EP3297777B1 EP16729309.1A EP16729309A EP3297777B1 EP 3297777 B1 EP3297777 B1 EP 3297777B1 EP 16729309 A EP16729309 A EP 16729309A EP 3297777 B1 EP3297777 B1 EP 3297777B1
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EP
European Patent Office
Prior art keywords
blank
punch
die
tab
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.)
Active
Application number
EP16729309.1A
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English (en)
French (fr)
Other versions
EP3297777A1 (de
Inventor
Ludovic VALLON
Jean Luc BRUN
François PREVOST
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.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication date
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Publication of EP3297777A1 publication Critical patent/EP3297777A1/de
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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
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the invention relates to the field of stamping, more precisely the shaping of a part, in particular of a bodywork or vehicle structure, by stamping a sheet metal blank.
  • tooling comprising a die
  • a punch and blank holders is usually used.
  • the blank holders are mounted laterally with the punch and sliding against elastic forces produced by the springs.
  • the die in the lower position, comprises lateral portions cooperating with the blank holders in order to clamp the edges of the sheet metal blank placed on the die. This clamping takes place during the downward movement of the punch towards the die, as soon as the blank holders contact the edges of the sheet metal blank, pressing them against the lateral portions of the die, against the elastic forces of the springs.
  • the punch contacts the central portion of the sheet metal blank, the latter is deformed towards the die. The sheet then undergoes warping deformations generating tensile forces which can cause the sheet to slide along the blank holders.
  • the purpose of the blank holders is to retain the sheet blank and, therefore, to generate elongation deformations of the sheet in order to avoid the formation of corrugations. Indeed, depending on the shape given to the stamping, the swallowing of sheet metal during shaping can cause compressive forces by excess of material, which can cause undulations. This is particularly the case when the stamping has a generally conical shape.
  • the document FR 3 012 055 describes a tool and a stamping process of this type.
  • the retention of the sheet blank by the blank holders can sometimes lead to excessive extension deformations leading to excessively small thicknesses, or even to ruptures.
  • the invention according to independent claims 1 and 5 aims to overcome at least one of the drawbacks of the state of the art, in this case of the aforementioned state of the art. More particularly, the object of the invention is to propose a solution for the shaping of open stampings.
  • the subject of the invention is a method for forming a part by stamping a sheet blank, comprising the following steps: (a) placing the sheet blank on a forming tool by stamping comprising a die and a punch capable of cooperating by engagement with the die; (b) mutual bringing together of the die and the punch in a direction of work, with a view to forming the part; in step (a), the sheet metal blank comprising at least one tab with at least one edge, and in step (b), the or each of the tabs being folded between the die and the punch and ensures retention of the sheet metal blank, the sheet metal blank being generally elongated in a longitudinal direction, the or each of the edges comprising the tab (s) being at one end, in said direction, of the sheet metal blank, the tool comprising at least one blank holder disposed laterally to one of the punch and the die and capable of clamping the sheet blank with the other of the punch and the die, the blank holder (s) being mounted to slide against an elastic force , in step (b), the or
  • the or each of the edges comprising the tab (s) forms a final edge of the part.
  • the tab (s) leave the blank holder (s) before the end of step (b).
  • the goal is for the leg (s) to be of minimum size. It is therefore useful for the blank holder (s) to interact with the leg (s) only at the start of step (b).
  • the tab (s) can leave the blank holder (s) at the latest at the halfway point for forming the sheet metal blank by the die and the punch in step (b).
  • the tab (s) are folded in the direction of work of the die and of the punch.
  • the or each of the legs comprises a bent portion forming a radius of curvature of between 1 and 10mm, preferably between 2 and 8mm.
  • the measures of the invention are advantageous in that they make it possible to produce stamped parts while saving material while controlling the shaping by adequate retention of the sheet during said shaping.
  • the figure 1 is a plan view of a sheet metal blank 2 intended to be shaped by stamping with a tool and according to a method in accordance with the invention.
  • the sheet metal blank 2 comprises a central portion 2 1 with several edges or sides. It also includes a tab 2 2 on one of its edges.
  • tab is meant a portion of sheet, integrally formed with the central portion, projecting from an edge of the central portion. It is thus a projecting portion, preferably generally flat with the central portion. Given that the portion is protruding, it has a width less than that of the edge from which it originates.
  • the sheet blank 2 extends in a longitudinal direction, and the tab 2 2 is located on an edge or side corresponding to one end of said blank along its longitudinal axis.
  • the figure 2 illustrates the principle of the stamping tool according to the invention and used to carry out the stamping process according to the invention.
  • the tooling comprises a die 4, a punch 8 and one or more blank holder 6.
  • the latter or the latter are mounted to slide along the periphery of the punch 8, against elastic forces generated by springs, not shown.
  • the sheet metal blank 2 is deposited on the blank holders 6 while the tool is in the open position.
  • the blank holders 6 are in the high position, that is to say more higher than that of the punch, and the sheet metal blank can be placed on the blank holders 6.
  • the figure 3 illustrates the situation where the die 4 has started its downward movement towards the punch 8 and where its end portions 4 1 and 4 2 are in contact with the sheet blank 2.
  • the enlarged portion of the figure 3 shows that the tab 2 2 of the sheet metal blank 2 is clamped between the portion 4 1 of the die 4 and the blank holder 6.
  • the figure 4 illustrates the process of shaping the figure 3 at a later stage, where the die 4 has moved closer to the punch 8 at a point where the contact face of the portion 4 1 of the die is aligned with the contact face facing the punch 8, to the thickness of the sheet metal.
  • the blank holder 6 therefore began its descent against the elastic forces of its springs.
  • the figure 5 illustrates a step in the figure 3 and 4 , at a later stage than that of the figure 4 , namely that the downward movement of the die 4 has the effect of bending the tab 2 2 downwards, in the space provided between the faces of the punch and of the die which are opposite (visible at the enlarged area of the figure 3 ).
  • the tab 2 2 thus folded then forms a brake for resurfacing the sheet metal blank for the remainder of the forming process.
  • the tab 2 2 forms a bent portion whose sliding along the corresponding edge of the punch generates a retaining force, in the manner of the blank holder. It is however understood that at the stage of figure 5 , depending on the length of the tab 2 2 , the blank holder 6 no longer has or almost no grip on said tab.
  • the radius of curvature R of the edge of the punch 8 forming the bent portion of the tab 2 2 is between 1 and 10mm, advantageously between 2 and 8mm. Such values provide an interesting resistance force in that it is sufficient without blocking the sliding of the tab.
  • the figure 6 illustrates a final or near-final stage of the shaping process of figures 3 to 5 .
  • the tab 2 2 is deformed by sliding along the contact surface of the punch following the tensile forces generated by the deformation of the central portion 2 1 generated by the coming together of the die 4 and the punch 8.
  • the figure 7 illustrates in perspective the shape that the sheet metal blank 2 gradually takes, essentially at the four stages of the forming process illustrated in figures 3 to 6 , respectively.
  • the representation in the upper position corresponds to the stage of figure 3 and the representation in the lower position corresponds to part 10 after stamping.
  • the part 10, in this case is a spar part. This piece is generally elongated. It can be observed that the left end of the part, in its longitudinal direction, is open, namely that the corresponding edge 10 1 of the sheet blank thus formed must not undergo a cutting step (trimming). It can also be observed that the right-hand end of the part, still in its longitudinal direction, is semi-open, namely that it has a partially final edge 10 2.
  • the tab 2 2 is present on this edge 10 2 but occupies a small space and does not necessarily have to be cut. It can be sized so as not to interfere with the assembly of the part during its assembly.
  • the longitudinal edges 10 3 and 10 4 for their part comprise portions intended to be cut. Indeed, these portions served to retain the sheet transversely to its main direction during its shaping, which made it possible to ensure satisfactory shaping.
  • the deformation applied to the sheet in this direction is indeed large in comparison with the deformations in the longitudinal direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (5)

  1. Verfahren zum Formen eines Werkstücks (10) durch Tiefziehen eines Blechzuschnitts (2), mit den folgenden Schritten:
    a) Aufbringen des Blechzuschnitts (2) auf ein Tiefziehwerkzeug mit einer Matrize (4) und einem Stempel (8), der durch Eingriff mit der Matrize (4) zusammenwirken kann;
    b) Annäherung der Matrize (4) und des Stempels (8) in einer Arbeitsrichtung zur Bildung des Werkstücks (10);
    in Schritt (a), wobei der Blechzuschnitt (2) mindestens eine Lasche (22) an mindestens einer Kante umfasst, und in Schritt (b), wobei die oder jede Lasche (22) zwischen der Matrize (4) und dem Stempel (8) gebogen ist und den Blechzuschnitt zurückhält, wobei der Blechzuschnitt (2) im Allgemeinen in einer Längsrichtung länglich ist, wobei die oder jede Kante, die die Lasche oder Laschen umfasst, an einem Ende des Blechzuschnitts (2) in der genannten Richtung liegt, wobei das Werkzeug mindestens einen seitlich zu diesem angeordneten Niederhalter (6) umfasst Stempel (8) und Matrize (4), der dazu geeignet ist, den Blechzuschnitt (2) mit dem anderen Stempel (8) und Matrize (4) zu verspannen, wobei der oder die Niederhalter (6) in Schritt (b) gegen eine elastische Kraft verschiebbar gelagert sind, wobei der oder mindestens einer der Niederhalter (6) die Längsränder des länglichen Blechzuschnitts (2) verspannt, dadurch gekennzeichnet, dass in Schritt (b) der oder mindestens einer der Niederhalter (6) die vordere(n) Lasche(n) (22) verspannt sie ist/sind zwischen der Matrize (4) und dem Stempel (8) gefaltet.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der oder jeder der die Lasche(n) aufweisenden Ränder einen Endrand (102) des Werkstücks (10) bildet.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass am Ende des Schrittes (b) die Lasche(n) (22) in Arbeitsrichtung der Matrize (4) und des Stempels (8) gebogen werden.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass am Ende des Schrittes (b) die oder jede der Laschen (22) einen gebogenen Abschnitt umfasst, der einen Krümmungsradius R zwischen 1 und 10 mm, vorzugsweise zwischen 2 und 8 mm, bildet.
  5. Werkzeug zum Formen eines Werkstücks (10) durch Tiefziehen eines Blechzuschnitts (2) nach dem Verfahren eines der Ansprüche 1 bis 4, wobei das Werkzeug umfasst:
    - eine Matrix (4);
    - einen Stempel (8), der mit der Matrize (4) durch Eingriff in die Matrize (4) zusammenwirken kann;
    der Stempel (8) mit einer Kante an einem dieser Ränder, die in die Matrize (4) eingreift, um die Lasche(n) (22) zwischen der Matrize (4) und dem Stempel (8) zu biegen und den abgewinkelten Teil der Lasche (22) zu bilden;
    Werkzeug, das ferner mindestens einen Niederhalter (6) umfasst, der seitlich des Stempels (8) angeordnet ist und geeignet ist, den Blechzuschnitt (2) mit mindestens einem Seitenabschnitt (41) der Matrize (4) zu klemmen, wobei der Niederhalter (6) oder die Niederhalter (6) entlang des Umfangs des Stempels gegen eine elastische Kraft verschiebbar montiert sind, dadurch gekennzeichnet, dass der Krümmungsradius (R) der Kante des Stempels (8), die den abgewinkelten Abschnitt der Lasche (22) bildet, zwischen 1 und 10 mm, vorzugsweise zwischen 2 und 8 mm, beträgt, um eine Halterung des Zuschnitts sicherzustellen Pol (2) beim Formen des Werkstücks (10).
EP16729309.1A 2015-05-18 2016-04-13 Formen von halboffenen metallstanzteilen Active EP3297777B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1554433A FR3036299B1 (fr) 2015-05-18 2015-05-18 Mise a forme d’embouti semi-ouvert
PCT/FR2016/050857 WO2016185105A1 (fr) 2015-05-18 2016-04-13 Mise a forme d'embouti semi-ouvert

Publications (2)

Publication Number Publication Date
EP3297777A1 EP3297777A1 (de) 2018-03-28
EP3297777B1 true EP3297777B1 (de) 2021-11-24

Family

ID=54014968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16729309.1A Active EP3297777B1 (de) 2015-05-18 2016-04-13 Formen von halboffenen metallstanzteilen

Country Status (5)

Country Link
EP (1) EP3297777B1 (de)
CN (1) CN107666974B (de)
ES (1) ES2901145T3 (de)
FR (1) FR3036299B1 (de)
WO (1) WO2016185105A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018205350A1 (de) * 2018-04-10 2019-10-10 Bayerische Motoren Werke Aktiengesellschaft Umformwerkzeug und Verfahren zum Herstellen einer Kante an einem Bauteil und Verfahren zum Herstellen eines solchen Umformwerkzeugs
CN111922171B (zh) * 2020-06-30 2021-10-08 成都飞机工业（集团）有限责任公司 一种多深腔飞机薄壁零件的钣金成型方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59111233A (ja) * 1982-12-16 1984-06-27 Toshiba Corp カラ−ブラウン管用シヤドウマスク成形装置
ES277870Y (es) * 1984-03-03 1985-12-01 Perez Marti Juan Cabezal para agrafar
US6006564A (en) * 1998-12-10 1999-12-28 Honda Of America Mfg., Inc. Application of dry lubricant to forming dies and forging dies that operate with high force
DE102009005261A1 (de) * 2009-01-20 2010-07-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung eines komplexen Blechformteils
FR3010921B1 (fr) * 2013-09-24 2016-02-19 Peugeot Citroen Automobiles Sa Outil d'emboutissage pour reprendre une piece emboutie ayant un bord tombe
FR3012055B1 (fr) * 2013-10-23 2015-11-20 Peugeot Citroen Automobiles Sa Emboutissage de piece avec patte(s) de fixation
CN104841761B (zh) * 2015-04-24 2016-10-05 福州大学 一种合金板电磁冲孔翻边成形方法及装置

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
FR3036299B1 (fr) 2017-05-19
CN107666974A (zh) 2018-02-06
CN107666974B (zh) 2020-04-14
WO2016185105A1 (fr) 2016-11-24
ES2901145T3 (es) 2022-03-21
FR3036299A1 (fr) 2016-11-25
EP3297777A1 (de) 2018-03-28

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