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WO2008138152A1 - Procédé de formage - Google Patents

Procédé de formage Download PDF

Info

Publication number
WO2008138152A1
WO2008138152A1 PCT/CH2008/000189 CH2008000189W WO2008138152A1 WO 2008138152 A1 WO2008138152 A1 WO 2008138152A1 CH 2008000189 W CH2008000189 W CH 2008000189W WO 2008138152 A1 WO2008138152 A1 WO 2008138152A1
Authority
WO
WIPO (PCT)
Prior art keywords
offset
height
sheet
forming process
contour
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.)
Ceased
Application number
PCT/CH2008/000189
Other languages
German (de)
English (en)
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
Priority to EP08733815A priority Critical patent/EP2142320B1/fr
Priority to AT08733815T priority patent/ATE544538T1/de
Publication of WO2008138152A1 publication Critical patent/WO2008138152A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 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. Furthermore, the present invention relates to an offset, as can be prepared by such a method or is prepared.
  • the feeder points over the entire circumference of the contour substantially the same geometry.
  • this indentation can be eliminated or minimized by bulk forming.
  • the geometry part (for example, a sharp tooth) can not be filled at all.
  • the invention is therefore inter alia based on the object of providing an improved forming process for producing dislocations.
  • 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 Hl is achieved which substantially Target height of the displacement corresponds, while the raised surface of the remaining displacement can reach a greater height H.
  • a first height Hl is achieved which substantially Target height of the displacement corresponds, while the raised surface of the remaining displacement can reach a greater height H.
  • the somewhat too large displacement in the regions which are different from the edge zones is now, as it were, undone.
  • 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 corresponds substantially to the target height of the offset.
  • At least one of the decisive edge zones of the offset is accordingly an area 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 adjusted so that the first height Hl 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 - 20 mm, preferably in the range of
  • the offset can generally have a target height or a first height H 1 or a second height H 2 in the range from 0.1 to 10 mm, respectively, preferably in the range from 0.2 to 3 mm, or in particular preferably in the range from 0.5 to 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 present invention relates to an offset preparable or produced by a method as described above.
  • the present invention further relates to a sheet having at least one offset with a row of teeth on at least one side (it is also possible to arrange two such displacements with teeth facing each other), this row of teeth a variety 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.
  • FIG. 1 shows a section through a currently undergoing a forming process sheet
  • FIG. 2 shows a plan view of a matrix with different contour line areas
  • FIG. 3 shows detailed sections through the regions A-D indicated in FIG. 2 in a direction parallel to the movement of the forming tool; and
  • FIG. 4 shows the tool guide in a downstream forming step for producing the final shape.
  • FIG. 1 shows a section which is guided along a line AD in a contour according to FIG. 2 (compare discussion below), that is to say in which a rounded region A is cut on the left side and on the right Side by a pointed tooth area D. Accordingly, on the left side of the formation of the feeder is much less pronounced than on the right side.
  • a sheet 2 is arranged flush with the die 1 arranged on a second side 10 of the sheet and subsequently from a second side 9 of the sheet, the punch 3 in a direction as indicated by the arrow Rl, 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 sheet, the punch 3 is simply not quite as deep in the sheet 2 (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 shown somewhat exaggerated.
  • Figure 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
  • the different characteristics of the resulting indents will be illustrated with reference to FIG.
  • 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 portions B.
  • a first step is essentially carried out as shown in FIG. 1, but 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, that of the final one desired level of the total displacement, while in all other areas initially a much too high height H of the transfer is accepted.
  • the offset is then pressed back to the required height. Since the material in the tip section can not be readily reset by 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.
  • contour corresponds to the desired geometry
  • contour corresponds to the desired geometry 4 contour of the desired geometry

Landscapes

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

Abstract

L'invention propose un procédé pour réaliser un décalage (7) dans une tôle (2) lors d'une opération de formage, la tôle (2) étant déformée en au moins une étape entre une matrice (1) qui présente un logement dont le contour (4) est prédéterminé et un poussoir (3) dont la forme de la bordure est définie essentiellement par le même contour (4), d'une manière qui amène les contours (4) à essentiellement se recouvrir. Le procédé est d'abord caractérisé en ce que la profondeur de pénétration du poussoir (3) dans la tôle (2) est établie dans une première direction (R1) lors de ladite première opération de déformation, de telle sorte que l'on obtienne dans les bordures décisives du décalage (7) une première hauteur (H1) qui correspond essentiellement à la hauteur visée pour le décalage (7), la surface (8) en relief du reste du décalage (7) atteignant une plus grande hauteur (H). Par ailleurs, le procédé est caractérisé en ce que dans une autre étape de déformation, le décalage (7) est ramené dans une deuxième direction (R2) opposée à la première direction (R1) par un poussoir de recul (5) qui recouvre au moins ledit contour (4), de telle sorte qu'essentiellement toute la surface (8) en relief du décalage (7) soit disposée à une deuxième hauteur (H2).
PCT/CH2008/000189 2007-05-09 2008-04-25 Procédé de formage Ceased WO2008138152A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08733815A EP2142320B1 (fr) 2007-05-09 2008-04-25 Procédé de formage
AT08733815T ATE544538T1 (de) 2007-05-09 2008-04-25 Umformverfahren

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7502007 2007-05-09
CH750/07 2007-05-09

Publications (1)

Publication Number Publication Date
WO2008138152A1 true WO2008138152A1 (fr) 2008-11-20

Family

ID=38596417

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2008/000189 Ceased WO2008138152A1 (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 (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
US20030157359A1 (en) * 2002-02-19 2003-08-21 Shinko Electric Industries Co., Ltd. Metal plate and method of shaping the same
JP2004291007A (ja) * 2003-03-26 2004-10-21 Araco Corp フランジを備えた製品の成形方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2926217B2 (ja) * 1996-02-26 1999-07-28 株式会社平安製作所 被扱き面を有する加工素材
JP3975715B2 (ja) * 2001-10-10 2007-09-12 トヨタ紡織株式会社 プレス成形方法及びそれに用いる装置

Patent Citations (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
US20030157359A1 (en) * 2002-02-19 2003-08-21 Shinko Electric Industries Co., Ltd. Metal plate and method of shaping the same
JP2004291007A (ja) * 2003-03-26 2004-10-21 Araco Corp フランジを備えた製品の成形方法

Also Published As

Publication number Publication date
EP2142320A1 (fr) 2010-01-13
ATE544538T1 (de) 2012-02-15
EP2142320B1 (fr) 2012-02-08

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