EP2142320B1 - Procédé de formage - Google Patents

Procédé de formage Download PDF

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Publication number
EP2142320B1
EP2142320B1 EP08733815A EP08733815A EP2142320B1 EP 2142320 B1 EP2142320 B1 EP 2142320B1 EP 08733815 A EP08733815 A EP 08733815A EP 08733815 A EP08733815 A EP 08733815A EP 2142320 B1 EP2142320 B1 EP 2142320B1
Authority
EP
European Patent Office
Prior art keywords
offset
height
forming process
contour
punch
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.)
Not-in-force
Application number
EP08733815A
Other languages
German (de)
English (en)
Other versions
EP2142320A1 (fr
Inventor
Rudolf Lüthi
Andreas Delis
Hans Jöhr
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.)
Adval Tech Holding AG
Original Assignee
Adval Tech Holding AG
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 Adval Tech Holding AG filed Critical Adval Tech Holding AG
Publication of EP2142320A1 publication Critical patent/EP2142320A1/fr
Application granted granted Critical
Publication of EP2142320B1 publication Critical patent/EP2142320B1/fr
Not-in-force legal-status Critical Current
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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work

Definitions

  • the present invention relates to a method for producing a dislocation in a metal sheet in a forming process. This involves a method in which a sheet is formed in at least one step between a die with a recess having a predetermined contour and a punch with a substantially given by the same contour edge shape in the contours substantially congruent leading together manner.
  • the indentation has essentially the same geometry over the entire circumference of the contour.
  • this indentation can be eliminated or minimized by bulk forming.
  • the material is plasticized in a die until the die is completely or partially filled.
  • the geometry part (for example, a sharp tooth) can not be filled at all.
  • the invention is therefore inter alia based on the object to provide an improved Umfonnmaschine for the production of dislocations available.
  • the penetration depth of the punch is set in the sheet in a first direction in said first forming process such that in the decisive edge zones of the displacement (where said indentations usually occur most strongly), a first height H1 is achieved, which is essentially the Target height of the displacement corresponds, while the raised surface of the remaining displacement can reach a greater height H.
  • a subsequent. Forming process is now to some extent reversed the somewhat too large displacement in the different areas of the fringes areas. This is achieved in that in a further, the first forming process downstream forming process, the displacement with a reset punch, which covers at least the said contour, in a first direction opposite to the second direction is returned such that substantially the entire raised surface of the offset is arranged at a second height H2.
  • the first height H1 is substantially the same as the second height H2, and thus substantially corresponds to the target height of the displacement.
  • At least one of the decisive edge zones of the offset is a region in which the contour has a corner with an angle of ⁇ 120 °, preferably of ⁇ 90 °.
  • Particularly critical is the creation of contours with tooth shape.
  • at least one of the decisive edge zones of the offset is at least one tooth form with an angle in the range of 20-70 °, preferably in the range of 30-60 °, particularly preferably in the range of 45 °.
  • a further preferred embodiment of the invention is characterized in that in the first forming process, the die is arranged on a second side of the sheet and substantially adjacent thereto and the punch from a second side of the sheet on this and this in the formation of the offset on the second side is guided, and that in the further forming process on the first side a flat, at least the contour on all sides substantially superior covering flat support is arranged and the reset punch is supplied from the second side of the sheet on the displacement of these transforming.
  • the reset punch has substantially the same contour as the offset and is guided substantially congruent thereto. But it is also possible that the reset punch is designed to be much larger and dominates the contour in all directions. Typically, the reset punch is then a flat support.
  • This limitation or control form can to a certain extent be a reset die, which has a recess in which the reset punch is guided and whose contour corresponds to the contour of the offset.
  • This reset die is then arranged in the further forming process, the displacement enclosing in contact with the surface of the sheet and the reset punch moves in the recess of the reset die the further forming process.
  • This reset die can be the die used in the first forming process.
  • This first die then has the said recess with the contour defining the offset, and in this recess the reset punch is guided.
  • the reset punch is pushed out of the sheet metal away from this recess so far that essentially no contact can take place between the reset punch and the offset in the first forming process.
  • the die is then left in place, the punch from the first forming process replaced by a flat support, and the reset punch in the recess of the die for the second forming process led to the offset.
  • critical tip areas can be "filled” even better by the second forming process.
  • the stamp is preferably introduced in the first forming process with a penetration depth into the sheet, which is greater than the target height of the offset.
  • the penetration depth is preferably set in a range of 110-400%, more preferably 150-300%, particularly preferably 180-220%.
  • the punch in the first forming process in the particular preferred range (180 - 220%) is performed between 0.9 - 1.1 mm deep in the sheet.
  • the proposed method surprisingly allows the contour to have different regions with different and in particular partially low radii of curvature.
  • the penetration depth of the punch is preferably set in such a way that the first height H1 at the acute-angled point (lowest radius of curvature) of the contour is ensured.
  • a sheet which can be subjected to such a process has a thickness in the range of 0.2 to 20 mm, preferably in the range of 0.5 to 5 mm, particularly preferably in the range of 1 to 4 mm.
  • the offset can generally have a target height or a first height H1 or a second height H2 in the range of 0.1-10 mm, respectively, preferably in the range of 0.2-3 mm, or in particular preferably in the range of 0.5-2 mm.
  • the first height is 1.5mm, and this first height is then reduced to about half in the second forming process, that is, about 0.7mm.
  • the method according to the present invention results in a sheet having at least one offset with one row of teeth on at least one side (it is also possible to dispose two such offset with teeth facing each other), this row of teeth being a plurality of linear or curved, elliptical or in a circle (to some extent gear) arranged side by side teeth with angles in the region of the tip of ⁇ 90 °, preferably in the range of 45 °.
  • Such linear or curved rows of teeth can to a certain extent be used as toothed racks for elements to be adjusted relative to one another (for example furniture parts etc., relative adjustment in height or in angle), if, for example, a corresponding stamped sheet metal with teeth on the outer edge or edges another sheet with a corresponding displacement is carried out with teeth.
  • a sheet of a thickness in the range of 2-4 mm proves to be advantageous in combination with a final height of the offset in the range of 0.5-1.5 mm.
  • This for example, for normal loads, such as those exercised by the human or man-operated furnishings, for example, on furniture.
  • the indentation in the corners over the straight section is much more pronounced, because the resistance to produce the offset in the material in the corners is greater than the straight sections. If, for example, an offset is now produced with a contour geometry in which individual geometric elements have a smaller angle than 90 ° (for example, a tooth form with an angle of approximately 45 °), the indentation becomes even larger.
  • FIG. 1 shows a section, which in accordance with a contour FIG. 2 (See discussion below) is guided along a line AD, that is, in which is cut on the left side by a rounded portion A and on the right side by a pointed tooth region D. Accordingly, on the left side of the formation of the feeder essential less pronounced than on the right.
  • a sheet 2 is arranged flush with the die 1 on a second side 10 of the sheet and subsequently from a second side 9 of the sheet, the punch 3 is oriented in a direction as indicated by the arrow R1, fed to the recess of the die 1.
  • the leadership of die 1 and 3 stamp is analogous, as if a hole with this contour should be made in the plate, the punch 3 is simply not quite as deep in the sheet 2 stirred (penetration depth of the punch 3 less than sheet thickness).
  • such a sheet is, for example, a steel sheet having a thickness in the range of 2 to 5 mm.
  • the recess formed in the die 1 has a contour which is identical to the outer contour of the stamp 3.
  • the height H of the offset achieved after the forming operation is not homogeneous over the entire areal extent of the offset.
  • Fig. 1 the resulting height differences are somewhat exaggerated.
  • FIG. 2 shows a plan view of an exemplary contour, which is to be produced as an offset in such a forming process.
  • the contour 4 has areas with different edge shapes, so over a circular area, which is denoted by A, over a straight area, which is denoted by B, via a corner C, in which the outer line with a small radius of curvature substantially to a Furthermore, a tooth shape is shown, this is denoted by D, and in this the contour is guided with a small radius of curvature by an angle of in the range of less than or in the range of 45 °.
  • the lowest indentations are normally generated in the straight areas as represented by B.
  • the present height X of the feeder is small, and the raised surface 8 of the offset 7 is slightly sloping over a substantial range at the desired height and only in a small edge region, and also there only over a small height X.
  • the height of the indent X becomes somewhat larger during the forming process, while the extent of the indentation in the plane of the sheet still moves in reasonable ranges and is substantially the same as in the straight areas B.
  • the height X of the indentation begins to make a significant percentage of the actual height of the offset, and also extends substantially into the raised surface 8 of the offset.
  • the height H1 is substantially less than the height H.
  • a first step is basically done as described in FIG. 1 In this case, however, the height H is to some extent carried out excessively, whereby it is taken into account that in the critical edge zones in this first forming process a height H1 is to be achieved which corresponds to the final desired height of the total offset, while in all other areas a first too high a height H of the transfer is accepted.
  • the offset is then pressed back to the required height.
  • the tip section Since the material in the tip section can not be readily reset due to the greater resistance to deformation and, moreover, there is no contact with the return punch 5 in the pull-in section, the tip section remains at the offset height of the first operation.

Landscapes

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

Claims (9)

  1. Procédé pour former un décalage (7) dans une tôle (2) au cours d'une opération de façonnage, dans lequel la tôle (2) est déformée en au moins une étape entre une matrice (1) dotée d'une découpe de contour (4) prédéterminé et un poussoir (3) dont la forme de la bordure est définie essentiellement par le même contour (4), d'une manière qui aligne les contours (4) l'un sur l'autre de telle sorte qu'ils se recouvrent essentiellement,
    caractérisé en ce que
    la profondeur de pénétration du poussoir (3) dans la tôle (2) dans une première direction (R1) au cours de ladite opération de façonnage est ajustée de telle sorte que dans les zones décisives de bordure du décalage (7) on obtienne une première hauteur (H1) qui correspond essentiellement à la hauteur visée du décalage (7) tandis que la surface (8) rehaussée atteint une hauteur (H) plus élevée dans le reste du décalage (7) et
    en ce que dans une autre opération de façonnage, le décalage (7) est réalisé dans une deuxième direction (R2) opposée à la première direction (R1) à l'aide d'un poussoir de recul (5) qui couvre au moins ledit contour (4), de telle sorte que le décalage (7) soit disposé à une deuxième hauteur (H2) sur essentiellement la totalité de la surface rehaussée (8).
  2. Procédé selon la revendication 1, caractérisé en ce que la première hauteur (H1) est essentiellement identique à la deuxième hauteur (H2).
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au moins l'une des zones décisives de bordure du décalage (7) forme une partie dans laquelle le contour (4) présente un coin dont l'angle est < 120° et de préférence < 90°.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au moins l'une des zones décisives de bordure du décalage (7) est au moins la forme d'une dent dont l'angle est de l'ordre de 20 à 70°, de préférence de 30 à 60° et de façon particulièrement préférable de l'ordre de 45°.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que dans la première opération de façonnage, la matrice (1) est disposée sur un deuxième côté (10) de la tôle (2) et repose essentiellement contre cette dernière et le poussoir est amené sur la tôle (2) par un premier côté (9) et est inséré dans le deuxième côté (10) de la tôle en formant le décalage (7) et en ce que dans l'autre opération de façonnage, un appui plat (6) qui recouvre le contour (4) sur tous ses côtés et en déborde essentiellement est disposé sur le premier côté (9), le poussoir de recul (5) étant amené sur le décalage (7) pour déformer ce dernier par le deuxième côté (10) de la tôle (2).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le poussoir de retour (5) présente essentiellement le même contour (4) que le décalage (7) et est amené vers ce dernier en le recouvrant essentiellement, tandis que de préférence dans l'autre opération de façonnage, le tampon de recul (5) est utilisé en même temps qu'une matrice de recul montée à coulissement par rapport au poussoir de recul (5), en contact avec le deuxième côté (10) de la tôle (2) pendant l'autre opération de façonnage, essentiellement immobile par rapport à la tôle (2) et entourant essentiellement le contour du décalage (7), cette matrice de recul pouvant être la matrice (1) utilisée dans la première opération de façonnage.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que dans la première opération de façonnage, le poussoir (3) est introduit dans la tôle (2) à une profondeur de pénétration plus grande que la hauteur visée du décalage (7), la profondeur de pénétration correspondant de préférence à 110-400 %, de façon particulièrement préférable à 150-300 % et de manière tout particulièrement préférable à 180-220 % de la hauteur visée pour le décalage (7).
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le contour (4) présente différentes parties (A-D) et en ce que la profondeur de pénétration du poussoir est ajustée de telle sorte que la première hauteur soit garantie à l'emplacement du sommet le plus accusé (D) du contour.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que la tôle (2) présente une épaisseur de l'ordre de 0,2 à 20 mm, de préférence de 0,5 à 5 mm et de manière particulièrement préférable de l'ordre de 1 à 3 mm et en ce que le décalage (7) présente respectivement une hauteur visée, une première hauteur (H1) et une deuxième hauteur (H2) de l'ordre de 0,1 à 10 mm, de préférence de l'ordre de 0,2 à 3 mm et de façon particulièrement préférable de l'ordre de 0,5 à 2 mm.
EP08733815A 2007-05-09 2008-04-25 Procédé de formage Not-in-force EP2142320B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7502007 2007-05-09
PCT/CH2008/000189 WO2008138152A1 (fr) 2007-05-09 2008-04-25 Procédé de formage

Publications (2)

Publication Number Publication Date
EP2142320A1 EP2142320A1 (fr) 2010-01-13
EP2142320B1 true EP2142320B1 (fr) 2012-02-08

Family

ID=38596417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08733815A Not-in-force EP2142320B1 (fr) 2007-05-09 2008-04-25 Procédé de formage

Country Status (3)

Country Link
EP (1) EP2142320B1 (fr)
AT (1) ATE544538T1 (fr)
WO (1) WO2008138152A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732587A (en) * 1996-02-26 1998-03-31 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Metallic workpiece having to-be-ironed section and method for forming the same
US20030066329A1 (en) * 2001-10-10 2003-04-10 Jiro Aizaki Methods and apparatus for manufacturing press formed articles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785655A (en) * 1987-01-05 1988-11-22 General Electric Company Method and arrangement for producing knockouts for electrical equipment cabinets
JP2003236632A (ja) * 2002-02-19 2003-08-26 Shinko Electric Ind Co Ltd 金属板及びその成形方法
JP4222077B2 (ja) * 2003-03-26 2009-02-12 トヨタ紡織株式会社 フランジを備えた製品の成形方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732587A (en) * 1996-02-26 1998-03-31 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Metallic workpiece having to-be-ironed section and method for forming the same
US20030066329A1 (en) * 2001-10-10 2003-04-10 Jiro Aizaki Methods and apparatus for manufacturing press formed articles

Also Published As

Publication number Publication date
EP2142320A1 (fr) 2010-01-13
ATE544538T1 (de) 2012-02-15
WO2008138152A1 (fr) 2008-11-20

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