EP0916429A1 - Méthode et dispositif pour le formage d'une paroi latérale à une plaque de base - Google Patents

Méthode et dispositif pour le formage d'une paroi latérale à une plaque de base Download PDF

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Publication number
EP0916429A1
EP0916429A1 EP98203771A EP98203771A EP0916429A1 EP 0916429 A1 EP0916429 A1 EP 0916429A1 EP 98203771 A EP98203771 A EP 98203771A EP 98203771 A EP98203771 A EP 98203771A EP 0916429 A1 EP0916429 A1 EP 0916429A1
Authority
EP
European Patent Office
Prior art keywords
baseplate
die
curved
side wall
blank holder
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
EP98203771A
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German (de)
English (en)
Other versions
EP0916429B1 (fr
Inventor
Franciscus Alphonsius Christianus M. Habraken
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.)
Wemo Nederland BV
Original Assignee
Wemo Nederland BV
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 Wemo Nederland BV filed Critical Wemo Nederland BV
Publication of EP0916429A1 publication Critical patent/EP0916429A1/fr
Application granted granted Critical
Publication of EP0916429B1 publication Critical patent/EP0916429B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/52—Making hollow objects characterised by the use of the objects boxes, cigarette cases, or the like

Definitions

  • the invention relates to a method for producing, for example, a panel which may be used, by way of example, as a cupboard door, from a baseplate which is made of deformable material, for example metal.
  • a panel of this nature has a planar plate part and, on the circumferential edge of the plate part, a side wall which is at an angle to the plate part, preferably at an angle of 90°.
  • Such panels are generally known and can be produced, for example, by deep-drawing the baseplate which is made of deformable material.
  • an edge region of the baseplate is enclosed by a blank holder and a die.
  • a punch then presses the baseplate into the die, the edge regions of the baseplate being drawn between the die and the blank holder and bent into the definitive form.
  • There is a surplus of material in a corner region of the baseplate when the edge region is converted from the flat state into the state in which it is at an angle.
  • the baseplate material which is present in this corner region becomes puckered.
  • the blank holder prevents the formation of creases in the corner region.
  • the side wall would have to be formed separately in a corner region of the baseplate.
  • Such local deformation of a corner region of a baseplate is known perse.
  • DE-40 09 466 describes a method with which each corner region can be deformed separately in order to obtain a seamless transition between the plate part and the side wall.
  • the side wall itself is also formed seamlessly.
  • this method use is made of a roller which is shaped like a diabolo.
  • two edge regions of the baseplate, which adjoin a corner region are turned up through a predetermined angle.
  • the interim product obtained in this way is placed on a work holder, after which the diabolo roller is rolled over the corner region.
  • the shape of the work holder determines the ultimate shape of the corner region.
  • a significant drawback of the method which is described in DE-40 09 466 is that during deformation the corner region is only supported by the work holder, so that while the corner region is being rolled considerable creasing occurs in the corner region which is yet to be deformed. These creases cannot be completely ironed out by the diabolo roller. The creasing is intensified by the fact that the interim product is of asymmetric shape in the corner region.
  • DE-35 30 513 gives a description of producing a rectangular shaped part by turning up the edge regions up to a distance from the corner region using a bending device of adjustable length so that the corner regions of the baseplate are not subjected to the bending. Then, a corner region which is enclosed between two edge regions is formed into the ultimate shape by deep-drawing.
  • this publication provides no explanation whatsoever of what the deep-drawing tool looks like. Also, the problems caused by the material present in the corner region upsetting and drawing are not dealt with. The document certainly does not provide a solution which allows the upsetting and drawing in the corner region to take place in a controlled manner during the deep-drawing.
  • One object of the invention is to provide a method with which a corner region of a baseplate can be locally deformed in order to obtain a side wall which is substantially perpendicular to the baseplate and has seamless transitions but in which creasing is prevented as far as possible during deformation of the corner region and the upsetting and drawing takes place in a controlled manner.
  • an important aspect of the method according to the invention is the fact that edge regions of the baseplate are turned up through an angle of substantially 90° along bend lines, forming side walls which continue at least as far as a corner region of the baseplate and which form a spout which projects outwards in the corner region.
  • the spout which is formed in this way a part of the corner region which is defined by the bend lines and a line of rounding of the baseplate, and those parts of the side walls which continue into the corner region are deformed into a conical spout, the conical shape being recognisable in particular in that part of the conical spout which extends along the line of rounding.
  • the conical spout is substantially symmetrical with respect to the bisector plane of the corner, which is included by the side walls adjoining the corner region.
  • the interim product which has been produced in this way is positioned in a device which clamps the conical spout between a die and a blank holder.
  • the blank holder and the die are of a three-dimensional shape which substantially corresponds to the shape of the spout. Then, a punch is used to press the corner region into the die, the spout being drawn between the die and the blank holder. The result is a continuous, rounded corner on the plate part with creasing being prevented and upsetting and drawing being limited to a minimum during the deep-drawing.
  • the invention furthermore relates to a method for forming a semi-finished product which is suitable for the method according to the invention.
  • the invention furthermore relates to a device with which the method according to the invention can be carried out.
  • Fig. 1 shows a corner part of a panel which is produced using the method according to the invention.
  • the panel is substantially in the form of a tray 1 with a flat bottom 2 and a side wall 4 which extends along an outer edge 3 of the bottom 2.
  • the bottom 2 is rectangular with substantially straight edge sections 3a, 3b and a rounded edge 3c in a corner region 5 of the tray 1, which is denoted by dashed line 5a.
  • the bottom 2 may also be in the shape of a triangle, a hexagon or some other polygon, such as a trapezium.
  • the edge section 3a, 3b are orientated at an angle to one another. The angles which are included by the various side wall sections are not necessarily equal to one another in a single panel.
  • the edge sections 3a, 3b include an angle of 90°.
  • the edge section 3a, 3b merge into one another via the rounded edge 3c.
  • the rounded edge 3c will describe part of the circumference of a circle. Other shapes, such as a part of the circumference of an ellipse, are also possible.
  • the curved wall section 4c is part of a cylinder and will be referred to in the text which follows as corner wall part 4c.
  • Fig. 2 shows part of a planar baseplate 19, which is the starting material for the tray 1 which is to be formed.
  • a dashed line is used to indicate the outer edge 3 which is to be formed.
  • the plate section 14 lying outside the outer edge 3 is intended to form the side wall 4.
  • the side wall sections 4a, 4b are turned up, for example with the aid of a bending machine, through an angle of preferably 90° along bend lines 7a, 7b.
  • the bend lines 7a, 7b extend as far as into the corner region 5 and include a predetermined angle. In this example, the angle included by the bend lines 7a, 7b is equal to 90°. However, other angles are also possible, although they will generally lie between 45° and 135°.
  • Fig. 2a shows the baseplate 19 in accordance with Fig. 2 with one turned-up edge region, forming the side wall section 4a. While this region is being turned up, the corner region 5 is not supported, so that the corner region 5 is able to deform freely.
  • the side wall section 4b is then formed, the result is the baseplate which is shown in Fig. 3 and has a crease-like transition 10 between the side wall sections 4a and 4b, which crease-like transition 10 is substantially symmetrical, the plane of symmetry substantially corresponding to the bisector plane of the angle which is included by the side wall sections 4a, 4b.
  • Fig. 2b shows the baseplate 19 in accordance with Fig. 2 in which one edge region has been turned up along its entire length, thus forming the side wall section 4a. While the side wall section 4b is being formed, the side wall section 4a is supported, so that the result is a baseplate as illustrated in Fig. 3a, with the crease-like transition 10 between the side wall sections 4a and 4b.
  • the baseplate which is illustrated in Fig. 3a has the advantage that the crease-like transition 10 projects only on one side of the baseplate. This means that one side of the crease-like transition lies in the plane of the side wall section 4a.
  • the baseplate which has the side wall sections 4a, 4b formed in this way is particularly suitable for an automated manufacturing processing for forming the corner wall part 4c.
  • the side wall section 4a can be used as a reference in a production device and makes the baseplate suitable for moving along a guide.
  • a spout 10 is formed in the corner region 5 as a result of the side wall sections 4a, 4b being turned up (see Fig. 3). That part 25 of the corner region 5 which is enclosed by the bend lines 7a, 7b and a line of rounding 18 is to be formed into the corner wall part 4c together with those sections of the side wall sections 4a, 4b which extend into the corner region.
  • the flat bottom 2 is clamped between a punch 11 and a mating punch 12, the side wall sections 4a, 4b bearing against the punch 11, as illustrated in Fig. 4.
  • the punch 11 determines the curvature of the corner wall section 4c along the line of rounding 18.
  • the crease-like transition 10 which is formed when the side wall sections 4a, 4b are turned up and the said part 25 of the corner region 5 to be shaped into a substantially conical spout 10a which extends along the rounded edge 3c, the bend lines 7a, 7b which extend into the corner region 5 being smoothed or straightened out as far as possible.
  • Fig. 7 shows the semi-finished product with the conical spout 10a.
  • the conical spout 10a is symmetrical with respect to the bisector plane of the angle included by the side wall sections 4a, 4b.
  • the semi-finished product may also be produced in a separate step using a suitable die and blank holder, the punch and blank holder, on the one hand, and the die and mating punch, on the other hand, forming single entities.
  • a conical spout 10a is formed in the corner region 5, and this spout can be deformed without problems using the deep-drawing process.
  • Enclosing the conical spout 10a and the adjoining parts of the side wall sections 4a, 4b between the die 13 and the blank holder 16 prevents the formation of creases and makes it possible to locally deform the plates which are relatively thin with respect to the height of the side wall and the rounding radius of the bottom 2 using the method according to the invention.
  • the shape of the die and the blank holder determine the ultimate quality of the end product. Ideally, the deformation of the corner region during the formation of the conical spout 10a is minimized by suitably selecting the shape of the die and the blank holder.
  • the costs of producing the die and the blank holder may play a role in selecting the shape of the die and the blank holder.
  • Fig. 9 illustrates an optimized blank holder 16.
  • Fig. 10 shows the die 13 which is associated with the blank holder 16 shown in Fig. 9.
  • the blank holder 16 has a surface 31, the width of which corresponds to the width of the conical spout 10a which is to be deformed.
  • the surface 31 bears against an internal surface of the conical spout 10a to be deformed.
  • the surface 31 is a so-called double-curved surface, the shape of which is calculated using the finite element method. With this method, it is possible to calculate a shape for the die 13 and the blank holder 16 in which the curvature of the surface is as small as possible.
  • This method is generally known and can be used, for example, to calculate deformations in materials when they are exposed to forces or other external influences.
  • FIG. 12 shows a model of a corner edge region which is divided into a number of region elements. If the size of the region and the size of the elements is selected appropriately, there is scarcely any, or no, deformation to the elements which lie next to circumferential edges 42, 43.
  • a number of boundary conditions are also incorporated in the model. The selection of the boundary conditions determines the result of the calculation.
  • the boundary condition for circumferential edge 41 is that there must be no displacement.
  • a displacement is imposed on the circumferential edges 42, 43. In this case, this displacement is a rotation through an angle of 90°.
  • a boundary condition is also imposed on the normal of the elements which adjoin the circumferential edges 42, 43, a rotation of the normal through an angle of 90° being possible in only one direction. The requirement of continuity is imposed on the entire surface.
  • Fig. 13 The result of the calculation is given in Fig. 13 and can be used to produce a blank holder 16 and the die 13 associated with the blank holder 16.
  • the conical spout 10a which is clamped between a blank holder 16 and die 13 of this nature undergoes minimal deformation.
  • a greater percentage of the deformability of the baseplate 19 is available for forming the corner wall part 4c.
  • the optimized blank holder 16 and die 13 result in a gradual and continuous transition between the side wall section 4a, 4b and the corner wall part 4c. There will be no abrupt transition in the surface of the end product.
  • the conical spout 10a In practice, it is desirable for the conical spout 10a to be stretched slightly while it is clamped between the blank holder and the die in order to remove any surface irregularities.
  • the irregularities present in the corner part may, for example, have been formed while the side wall sections 4a, 4b were being turned up.
  • the geometry of the optimized die 13 and blank holder 16 can ensure that such surface irregularities are removed by stretching the material. Only low levels of force are required to achieve this, and a better result is obtained than that produced by, for example, rolling. In order to carry out the stretching, an expansion is applied to each element during the calculation.
  • Fig. 11 shows two diagrammatic, perpective views of a die 20 and a blank holder 21 for enclosing a conical spout 10a which is formed on a baseplate with side wall parts, which die and blank holder are simple to produce, for example using the wire spark erosion technique.
  • a recess the surface of which is formed by a cylindrical surface 24 and two tangent surfaces 22, 23 on the cylindrical surface 24, is arranged in the die 20, which determines the radius of the corner wall part to be formed.
  • the axis of the cylindrical surface 24 lies in the bisector plane of the angle which is included by the side wall parts of the baseplate and forms an angle with the baseplate. This angle generally lies between 15° and 50°.
  • the two surfaces 22, 23 which are tangent on the cylindrical surface 24 form an angle with one another which is selected to be such that virtually the entire conical spout 10a which is formed on the baseplate can be enclosed by the die 20 and the blank holder 21.
  • the shape of the blank holder 21 is substantially complementary to the die.
  • a gap is formed between the die 20 and the blank holder 21, the width of which gap substantially corresponds to the thickness of the baseplate 19 which is to be deformed.
  • a certain degree of flexibility is possible in terms of the width of the gap formed between the die 20 and the blank holder 21.
  • the die and the blank holder are simple and inexpensive to produce.
  • Fig. 14 diagrammatically depicts a device 30 according to the invention.
  • the device 30 comprises a punch 40 and a mating punch 41, by means of which a semi-finished product can be clamped and positioned in the device 30.
  • the device 30 furthermore comprises the die 20, which determines the shape of the finished product, and the blank holder 21. On their sides which face towards one another, the die 20 and the blank holder 21 each have a surface between which a gap can be formed. The shape of the surfaces substantially corresponds to the shape of the conical spout 10a of the semi-finished product.
  • the device 30 is also provided with means (not shown) for exerting on the die 20 and the blank holder 21, or on the punch 40 and the mating punch 41, forces which are directed towards one another. Moreover, the device 30 is designed to move the punch 40 and the mating punch 41 with respect to the die 20 and the blank holder 21, so that the conical spout 10a is deep-drawn. Using a device 30 of this nature, it is possible to form and deep-draw the conical spout 10a in a single step.
  • Fig. 15 shows a plan view of the die 13 together with the recess 17 which is shaped on the basis of the result of the calculations carried out using the finite element method as described above. Furthermore, the mating punch 12, which accurately joins an internal wall 26 of the die 13 which determines the ultimate shape of the end product, is arranged in the die 13.
  • Fig. 16-18 diagrammatically depict various stages in the process of deep-drawing the conical spout 10a. Each stage is illustrated along the cross-sectional lines A-A, B-B, C-C and D-D in Fig. 15.
  • the conical spout 10a is enclosed between the die 13 and the blank holder 16, the curvature of the conical spout 10a depending on the position with respect to the bisectrix of the angle which is included by the side wall sections 4a, 4b.
  • the conical spout 10a is pulled out of the gap which is formed between the die 13 and the blank holder 16.
  • the material which is present in the conical spout 10a is able to flow smoothly, and the entire region in which deformation may occur is enclosed by either the die 13 and the blank holder 16 or the die 13 and the punch 11, so that the formation of creases is effectively prevented.
  • the deep-drawing process has been completed and the conical spout 10a has been completely formed into the corner wall part 4c (cf. d in Fig. 18).
  • the method according to the invention is particularly suitable for forming panels, such as cupboard doors, front panels of drawers and the like, from metal plates, a seamless transition being formed, in a corner region of the baseplate, between the baseplate and the side wall sections of the panel to be formed which meet in the corner region.
  • the method according to the invention can be carried out locally, so that one corner wall part at a time is formed.
  • a plurality of dies and blank holders may be used, in which case the distance between the dies is adjustable, so that a plurality of corners can be formed simultaneously.
  • the die and the blank holder are adapted to the corner which is to be formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Selective Calling Equipment (AREA)
  • Fuses (AREA)
  • Making Paper Articles (AREA)
EP98203771A 1997-11-12 1998-11-10 Méthode et dispositif pour le formage d'une paroi latérale à une plaque de base Expired - Lifetime EP0916429B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1007527A NL1007527C2 (nl) 1997-11-12 1997-11-12 Werkwijze en inrichting voor het vormen van een zijwand aan een plaat.
NL1007527 1997-11-12

Publications (2)

Publication Number Publication Date
EP0916429A1 true EP0916429A1 (fr) 1999-05-19
EP0916429B1 EP0916429B1 (fr) 2003-06-25

Family

ID=19766004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98203771A Expired - Lifetime EP0916429B1 (fr) 1997-11-12 1998-11-10 Méthode et dispositif pour le formage d'une paroi latérale à une plaque de base

Country Status (7)

Country Link
EP (1) EP0916429B1 (fr)
AT (1) ATE243578T1 (fr)
DE (1) DE69815790T2 (fr)
DK (1) DK0916429T3 (fr)
ES (1) ES2202737T3 (fr)
NL (1) NL1007527C2 (fr)
PT (1) PT916429E (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1577030A1 (fr) * 2004-03-17 2005-09-21 Signature SA Procédé de fabrication d'un panneau, notamment d'un panneau de signalisation
WO2015155943A1 (fr) * 2014-04-09 2015-10-15 新日鐵住金株式会社 Article moulé par compression, élément structural d'automobile équipé de celui-ci, et procédé et dispositif de fabrication dudit article moulé à la presse
EP2962778A4 (fr) * 2013-02-28 2016-03-02 Jfe Steel Corp Procédé de formage sous pression
CN115007744A (zh) * 2022-08-08 2022-09-06 宁波沃特汽车部件有限公司 一种加强板的双向弯折成型工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3569324B1 (fr) * 2018-05-14 2021-03-03 Fagor Arrasate, S.Coop. Installation et procédé de formation d'au moins une zone d'angle dans une plaque métallique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE729375C (de) * 1941-06-07 1943-04-14 Jagenberg Werke Ag Verfahren und Vorrichtung zum Schliessen eines mehreckigen Behaeltermantels durch Einsetzen eines Verschlussteiles sowie Zuschnitt zum Herstellen des Verschlussteiles
DE3530513A1 (de) * 1984-12-03 1986-06-12 Voest-Alpine Ag, Linz Verfahren und vorrichtung zum herstellen von vieleckigen, insbesondere rechteckigen formteilen aus blech

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE729375C (de) * 1941-06-07 1943-04-14 Jagenberg Werke Ag Verfahren und Vorrichtung zum Schliessen eines mehreckigen Behaeltermantels durch Einsetzen eines Verschlussteiles sowie Zuschnitt zum Herstellen des Verschlussteiles
DE3530513A1 (de) * 1984-12-03 1986-06-12 Voest-Alpine Ag, Linz Verfahren und vorrichtung zum herstellen von vieleckigen, insbesondere rechteckigen formteilen aus blech

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1577030A1 (fr) * 2004-03-17 2005-09-21 Signature SA Procédé de fabrication d'un panneau, notamment d'un panneau de signalisation
FR2867705A1 (fr) * 2004-03-17 2005-09-23 Signature Sa Procede de fabrication d'un panneau, notamment d'un panneau de signalisation.
EP2962778A4 (fr) * 2013-02-28 2016-03-02 Jfe Steel Corp Procédé de formage sous pression
US9833826B2 (en) 2013-02-28 2017-12-05 Jfe Steel Corporation Press forming method
WO2015155943A1 (fr) * 2014-04-09 2015-10-15 新日鐵住金株式会社 Article moulé par compression, élément structural d'automobile équipé de celui-ci, et procédé et dispositif de fabrication dudit article moulé à la presse
JPWO2015155943A1 (ja) * 2014-04-09 2017-04-13 新日鐵住金株式会社 プレス成形品及びこれを備えた自動車用構造部材、並びにそのプレス成形品の製造方法及び製造装置
CN115007744A (zh) * 2022-08-08 2022-09-06 宁波沃特汽车部件有限公司 一种加强板的双向弯折成型工艺
CN115007744B (zh) * 2022-08-08 2022-10-25 宁波沃特汽车部件有限公司 一种加强板的双向弯折成型工艺

Also Published As

Publication number Publication date
DE69815790D1 (de) 2003-07-31
DK0916429T3 (da) 2003-09-29
DE69815790T2 (de) 2004-05-13
ES2202737T3 (es) 2004-04-01
EP0916429B1 (fr) 2003-06-25
ATE243578T1 (de) 2003-07-15
PT916429E (pt) 2003-11-28
NL1007527C2 (nl) 1999-05-17

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