EP3357597B1 - Piston de cintrage - Google Patents

Piston de cintrage Download PDF

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Publication number
EP3357597B1
EP3357597B1 EP18154878.5A EP18154878A EP3357597B1 EP 3357597 B1 EP3357597 B1 EP 3357597B1 EP 18154878 A EP18154878 A EP 18154878A EP 3357597 B1 EP3357597 B1 EP 3357597B1
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EP
European Patent Office
Prior art keywords
piston
bending
blank
section
blank forming
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
EP18154878.5A
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German (de)
English (en)
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EP3357597A1 (fr
Inventor
Kenneth Andersen
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.)
KA Holding Stovring Aps
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KA Holding Stovring Aps
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Publication date
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Priority to PL18154878T priority Critical patent/PL3357597T3/pl
Publication of EP3357597A1 publication Critical patent/EP3357597A1/fr
Application granted granted Critical
Publication of EP3357597B1 publication Critical patent/EP3357597B1/fr
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    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/045—With a wiping movement of the bending blade

Definitions

  • the present invention relates to an apparatus for bending a metal blank as well as a bending piston used in such an apparatus.
  • a number of technologies are available. One of these is to position a blank in a bending machine and by arranging a bending piston for engagement with the blank, the blank or a section of the blank may be provided with a bend such that the blank has a three-dimensional shape after being treated in the bending machine.
  • the bending process requires two separate bending steps as it is necessary to reposition the blank to be bent in that the types of bending machines typically used for bending blank materials of this type may only bend up to 90°.
  • the blank to be bent is superposed an aperture in a land whereby a bending piston arranged in the aperture is moved upwards thereby engaging and bending the sheet metal.
  • a counter land is provided in order to determine the exact position where the bend is to be achieved, such that a relatively sharp and predetermined bend may be achieved.
  • the bending piston may be moved.
  • the bending process requires that the bending dies are movable. As the bending piston is moved downwards, thereby creating the first part of the bend, the die-parts of the tool is moved laterally relative to the movement direction of the bending piston, thereby creating the two-part bending as a one multi-movement bending operation.
  • a further example of how to achieve this bending action i.e. a bend smaller than 90° is also disclosed in DE10223637 .
  • the bending piston is mounted in a cup-shaped member.
  • the first part of the bending action will be carried out with the bending piston moving linearly relative to the object to be bent.
  • the cup will be forced to rotate, thereby urging the bending piston to rotate, whereby the bend is pushed over 90°, and hence a smaller angle is achieved.
  • the invention addresses this by providing an apparatus for bending a metal blank into a predetermined shape, said apparatus comprising a land having a substantially planar surface on which the blank to be bent is placed, where an aperture is provided in said land, said aperture having a size and shape allowing a bending piston to move perpendicular and through said planar surface, said bending piston being operated by a pressure plate, such that the pressure plate can exert a pressure on the bending piston thereby urging the piston through the aperture, where the bending piston engages the blank to be bent, such that the blank is deformed/bent along a first surface on a counter land positioned on the other side of the blank, the bending piston has a longitudinal body with a cylindrical cross-section, where in a first end of the body a pressure plate engagement surface is provided and in an opposite second end a blank forming section is provided, where said blank forming section is coupled to the body by a tilting section wherein the tilting section between the blank forming section and the body is created by a slit in the
  • the feature of providing the bending piston with a tilting section separating the blank forming section from the body of the piston achieves the object of being able to bend the blank in an angle substantially different from the typically maximum angle of 90°.
  • the tilting section engages the blank the blank will resist the movement of the piston thereby activating the tilting section such that the blank forming section of the bending piston is brought into a position of more than 90°, i.e. bent more than what is possible due to the perpendicular movement of the traditional bending piston.
  • the slit will typically project more than halfway through the body leaving a limited material thickness in the tilting section such that as the blank forming section engages the blank to be bent, the elasticity of the steel from which the bending piston is manufactured will be able to elastically deform whereby the blank forming section will tilt relative to the body of the piston.
  • the tilting movement and thereby the angle which may be bent is decided by the width of the slit, i.e. the distance between the blank forming section and the body of the piston where the slit is provided.
  • the invention in a further embodiment provides that the slit has a predetermined width in the longitudinal direction of the piston body, and where at the bottom of the slit a circular cylindrical cavity is provided spanning the width of the slit, said circular cylindrical cavity arranged perpendicular to the longitudinal direction of the piston.
  • the first surface of the counter land has an angle relative to the axis along which the bending piston moves which is negative, resulting in the blank being bent at least 90°.
  • the counter land "stops" the movement of the blank as the counter land is a solid part of the apparatus for bending a metal blank, and as such the movement of the bending piston is also stopped upon engagement of the counter land.
  • the tilting section of the bending piston is able to deform the blank which will be bent into the desired angle very precisely as it is in engagement with the planar surface, the bending piston and the counter land such that the blank is completely fixated in its bent position. Consequently, the angle of the surface of which the blank is to be bent along the counter land is decisive together with the tilting ability of the bending piston in deciding the exact angle at which the blank is being bent in the one-step bending procedure according to the present invention.
  • the tilting section is created by the blank forming section being a separate part, pivotably attached to the body of the piston.
  • the separate part being attached to the body of the piston is guided by the construction of the apparatus in that the aperture in the land constituting the substantial planar surface on which the blank to be bent is placed will guide and maintain the separate part in a more or less fixed position relative to the rest of the body of the piston. Only as the separate part engages the blank to be bent will it tilt out of alignment with the rest of the body in order to provide the bending action to which the bending piston is designed.
  • the pivotable connection may be provided by a construction where the pivotable connection between the blank forming end section and the body of the piston is created by one part having a ball structure and the opposite part having a cavity suitable to accommodate and retain the ball structure, such that the ball structure may tilt/move inside the cavity.
  • the pivotable connection provided with the ball and cavity allows the design of the tilting action to be decided very precisely as the separate part may be spaced, the desired distance from the upper part of the body on which the ball part is provided such that the spacing between the separate part and the body of the piston constitutes the distance at which the separate part is able to tilt relative to the body of the piston. The larger the distance, the more tilt is possible.
  • the cylindrical cavity enhances the ability of the piston material next to the slit to be deformed elastically such that a reliable tilting action may be obtained.
  • the apparatus according to the invention is constructed such that between the first end of the body and the pressure plate an adjustment mechanism is provided, said adjustment mechanism comprising an adjustment body, which adjustment body is adjustably arranged in an aperture in the pressure plate, and where through an aperture through the adjustment body a bolt may attach the bending piston to the adjustment body.
  • the body length of the bending piston is initially decided by the overall construction, i.e. the desired bending length, pressure plate thicknesses and other conditions.
  • the further adjustment possibility provided by the adjustment body allows for finer adjustment taking account of smaller variations.
  • Such smaller variations may arise due to variations in material characteristics, for example bending strength - which may vary between for example 250 N/mm2 to 550 N/mm2 between coils, or material thickness which may vary by tenths of millimeters. These variations influence the spring back tendency of the metal, and thereby the necessary bending angle in order to achieve the desired resulting design bending angle (after spring back of the metal).
  • the adjustment mechanism provides an easy way to adjust for these minor variations, such that a perfect resulting bend may be achieved.
  • the adjustment body is provided with an exterior thread
  • the aperture in the pressure plate accommodates said adjustment body, where said aperture is provided with a corresponding thread, such that the adjustment body threadily engages the thread in the aperture of the pressure plate.
  • the apparatus as discussed above may be provided with plurality of pistons each provided with their own aperture in the land such that as the pressure plate moves upwards, a plurality of bending pistons and thereby blank forming sections are elevated from the planar surface of the land engaging a blank position on top of the blank with a corresponding counter land such that a plurality of formed sections may be achieved in a single movement of the apparatus.
  • the invention is also directed at a bending piston per se, where the bending piston has a longitudinal body with a cylindrical cross-section, where in a first end of the body a pressure plate engagement surface is provided and in an opposite second end a blank forming section is provided, where said blank forming section is coupled to the body by a tilting section.
  • FIG 1a a first embodiment of the bending piston 1 according to the invention.
  • the bending piston has a cylindrical cross-section as illustrated in figure 1b which in this example is substantially quadratic with rounded-off corners.
  • the cross-section of the bending piston 1 may have any geometrical shape as desired.
  • the bending piston 1 has a body section 2, a tilting section 3 and a blank forming section 4.
  • the blank forming section 4 is in this embodiment provided with a curvature 5 such that as the piston engages the blank, the blank will be forced to follow the curvature thereby bending the blank as will be explained below.
  • the tilting section 3 is provided with a slit 6 as well as a circular cylindrical cavity 7. In this manner the cross-section of the piston 1 has been weakened such that the remaining material 8 in the tilting section will be able to deform as the curvature 5 of the blank forming section 4 engages a blank (and a counter-land as will be explained further below).
  • the slit 6 determines the amount of tilt the tilting section will allow the blank forming section to perform, and consequently the distance "a", i.e. the width of the slit, is determined for the movement of the blank forming section relative to the body of the piston.
  • a substantially planar surface 9 suitable to engage a pressure plate in the apparatus for bending a metal blank.
  • FIG 2 is illustrated an alternative embodiment of the top part of the bending piston according to the present invention.
  • the bending piston 10 also has a body portion 2', a tilting section 3' and a blank forming section 4'.
  • the difference compared to the embodiment described above is the fact that the blank forming section 4' in this embodiment is a separate part which is pivotally attached to the body portion 2' of the bending piston 10.
  • the tilting section 3' is created by providing the upper part of the body portion 2' with a ball structure 11 accommodated in a cavity 12 where the cavity 12 is formed such that the ball structure 11 holds the blank forming section 4' such that the separate 4' can pivot around the ball structure 11 in order to deform the blank as described above.
  • the tilting section 3' will therefore be able to tilt due to the distance "a' " between the blank forming section 4' and the body portion 2'.
  • Figures 3 and 4 illustrate a view of the bending piston depicted in figure 2 from an orthogonal angle in order to illustrate that the ball structure 11 as illustrated with reference to figure 3 may be shaped as a ridge 11' accommodated in a groove 12' such that it is possible to slide the blank forming section 4" right or left in relation to the body portion 2'. In this manner it is possible to exchange the blank forming section 4", for example with another blank forming section having a different curvature 5'.
  • figure 4 is illustrated an embodiment where the ball structure 11 is a ball on a stem 13.
  • the length of the stem decides the distance A which in turn as already discussed above determines how much tilting action is allowed by the tilting section 3'.
  • FIG 5 an apparatus for bending a metal blank into a predetermined shape is illustrated. Only the parts of the apparatus 20 having influence or being directly involved in the actions of the bending piston will be mentioned as apparatuses of this type are well-known in the technical field.
  • the bending piston 1 is arranged inside the apparatus 20 such that a lower end of the piston 1 is in contact with a pressure plate 31.
  • the pressure plate 31 In the illustrated position of the apparatus the pressure plate 31 is closest in position relative to a land 32.
  • the land 32 is provided with a planar surface 33 which planar surface 33 is supposed to receive the blank to be bent.
  • an aperture 34 In the land 32 is provided an aperture 34 through which the bending piston 1 may move upwards and downwards due to the action of the pressure plate 31 which can move away from the land 32 in order to withdraw the piston 1 from the position it is illustrated in.
  • a counter-land 35 is provided between the lower surface 36 of the counter-land 35 and the planar surface 33. Between the lower surface 36 of the counter-land 35 and the planar surface 33 is provided space for the blank to be bent.
  • the blank forming section 4 will engage the blank and bend initially upwards and once the tilting section 3 is activated due to the piston's engagement with the blank and the counter land the blank forming section will tilt thereby forcing the blank into a position or an angle different from 90° parallel to the surface 37 of the counter land 35.
  • FIG. 6 a single cycle of a blank forming process in an apparatus according to the present invention is schematically illustrated.
  • the pressure plate 31 is in its lowermost position with respect to the land 32.
  • a bending piston 1 is arranged in an aperture 34.
  • On the planar surface 33 of the land 32 is arranged a blank 50 which is to be provided with a bend.
  • a counter-land 35 is provided with a bending surface 37 such that as the piston 1 moves upwards the blank 50 will also be urged upwards and due to the curvature 5 on the blank forming section 4 of the piston 1 the blank will be bent up to a position where it is adjacent the surface 37.
  • FIG 8 is schematically illustrated an apparatus comprising a plurality of pistons 1 such that as the pistons engage a blank 50' arranged on the planar surface 33 of the land 32 the blank forming sections 4 of the pistons 1 will engage the blank 50' thereby creating bent sections for a number of sections due to the plurality of pistons 1 arranged in the apparatus.
  • pistons in figure 1b and 8 may have any desirable cross-section, for example they may be rectangular in order to be able to bend longer sections of blanks or any other desirable coss- section.
  • FIG 9 is a further embodiment of the invention illustrated.
  • the slit 6' is provided with a substantial extend in the pistons' longitudinal direction, thereby creating a relative slender portion 8', which during the bending action of the blank (not illustrated) will be slightly deformed, allowing the blank forming section 4' to bend the blank beyond the 90° (into a smaller angle).
  • the blank forming sections' 4 ability to bend out relative to the longitudinal axis 50, is decided by the size of the slit 6'. The larger the slit (in the direction of the axis 52) the more rotation the bending section 4' is allowed.
  • the bending piston 1 is fixed to an adjustment body 54, by means of a bolt 56.
  • a fine thread 58 is provided on the outside of the adjustment body 54 .
  • a corresponding thread 60 is provided in an aperture in the pressure plate 62.
  • the adjustment body 54 may be rotated in the thread 58,60, such that the adjustment body 54 is displaced along the axis 52.
  • the blank forming section 4' is displaced relative to the pressure plate's lower surface 64. In this manner it is possible to relatively easily adjust the bending piston's 1 extent, relative to the surface 64 of the pressure plate 62.
  • This adjustment is advantageous as the metal coils from which the metal blanks are manufactured may vary, both with respect to thickness, where variations of 1/10 mm or more is not unusual as also the strength may vary from coil to coil, typically between 300 N/mm2 to 500 N/mm2. These material characteristics influence the bending action and create more or less spring back, and hence the desire to be able to easily adjust the bending angle performed by the bending tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (14)

  1. Appareil permettant de cintrer une ébauche (50) métallique en une forme prédéterminée, ledit appareil comprenant un méplat (32), un piston (1) de cintrage et un serre-flan (31), le méplat (32) ayant une surface (33) sensiblement plane sur laquelle l'ébauche (50) devant être cintrée est placée, où une ouverture (34) est fournie dans ledit méplat (32), ladite ouverture (34) ayant une taille et une forme permettant audit piston (1) de cintrage de se déplacer perpendiculairement et à travers ladite surface (33) plane, ledit piston (1) de cintrage étant mis en fonctionnement par ledit serre-flan (31), de sorte que le serre-flan (31) puisse exercer une pression sur le piston (1) de cintrage poussant ainsi le piston (1) à travers l'ouverture (34), où le piston (1) de cintrage met en prise l'ébauche (50) devant être cintrée, de sorte que l'ébauche (50) soit déformée/cintrée le long d'une première surface (37) sur un contre-méplat (35) positionné sur l'autre côté de l'ébauche (50), le piston (1) de cintrage a un corps (2) longitudinal avec une coupe transversale cylindrique, où dans une première extrémité (9) du corps (2) une surface de mise en prise de serre-flan (9) est fournie et dans une seconde extrémité opposée une section de formation d'ébauche (4) est fournie, où ladite section de formation d'ébauche (4) est accouplée au corps (2) par une section d'inclinaison (3) caractérisé en ce que la section d'inclinaison (3) entre la section de formation d'ébauche (4) et le corps (2) est créée par une fente (6) dans le piston (1), de sorte que l'épaisseur de matériau dans la coupe transversale du piston soit réduite en raison de la fourniture de la fente (6).
  2. Appareil selon la revendication 1, dans lequel la première surface (37) sur le contre-méplat (35) a un angle par rapport à l'axe le long duquel le piston (1) de cintrage se déplace qui est négatif, ce qui a pour résultat que l'ébauche est cintrée à au moins 90°.
  3. Appareil selon la revendication 1 dans lequel la section d'inclinaison (4', 5, 5') est créée par la section de formation d'ébauche qui est une partie distincte, attachée de manière pivotante au corps (2) du piston (1).
  4. Appareil selon la revendication 3 où la liaison pouvant pivoter entre la section d'extrémité de formation d'ébauche (4', 5, 5') et le corps (2) du piston est créée par une partie ayant une structure de bille (13) et la partie opposée ayant une cavité (11) appropriée pour recevoir et retenir la structure de bille (13), de sorte que la structure de bille (13) puisse s'incliner/se déplacer dans la cavité (11).
  5. Appareil selon la revendication 1, où la fente (6) a une largeur prédéterminée dans la direction longitudinale du corps de piston, et où au fond de la fente une cavité cylindrique circulaire (7) est fournie s'étendant sur la largeur de la fente (6), ladite cavité cylindrique circulaire (7) étant agencée perpendiculairement à la direction longitudinale du piston (1).
  6. Appareil selon la revendication 1, où entre la première extrémité du corps (2) et le serre-flan (31) un mécanisme de réglage est fourni, ledit mécanisme de réglage comprenant un corps de réglage (54), lequel corps de réglage est agencé de manière réglable dans une ouverture dans le serre-flan (31), et où à travers une ouverture à travers le corps de réglage (54) un boulon (56) peut attacher le piston (1) de cintrage au corps de réglage (54).
  7. Appareil selon la revendication 6, où le corps de réglage (54) est doté d'un filet extérieur (60), et où l'ouverture dans le serre-flan reçoit ledit corps de réglage (54), où ladite ouverture est dotée d'un filet correspondant (58), de sorte que le corps de réglage (54) mette en prise par filetage le filet dans l'ouverture du serre-flan.
  8. Appareil selon une quelconque revendication précédente dans lequel une pluralité de pistons (1) de cintrage sont dotés d'un nombre correspondant d'ouvertures dans le méplat (32) .
  9. Piston (1) de cintrage pour une utilisation dans un appareil selon l'une quelconque des revendications 1 à 8, dans lequel le piston (1) de cintrage a un corps (2) longitudinal avec une coupe transversale cylindrique, où dans une première extrémité du corps une surface de mise en prise de serre-flan (9) est fournie et dans une seconde extrémité opposée une section de formation d'ébauche (4) est fournie, où ladite section de formation d'ébauche (4) est accouplée au corps (2) par une section d'inclinaison (3) et dans lequel la section d'inclinaison (3) entre la section de formation d'ébauche (4) et le corps (2) est créée par une fente (6) dans le piston (1), de sorte que l'épaisseur de matériau dans la coupe transversale du piston soit réduite en raison de la fourniture de la fente (6).
  10. Piston de cintrage selon la revendication 9 dans lequel la largeur de la fente (6) dans la direction du corps (2) longitudinal limite l'inclinaison de la section de formation d'ébauche (4) par rapport au corps (2) longitudinal.
  11. Piston de cintrage selon la revendication 9 ou 10 où la section de formation d'ébauche (4) est d'un seul bloc avec le corps (2) longitudinal.
  12. Piston de cintrage selon la revendication 9 où la section de formation d'ébauche (4) est un élément distinct attaché de manière pivotante au corps (2) longitudinal.
  13. Piston de cintrage selon la revendication 9 où la section d'inclinaison (3) est fabriquée à partir d'un matériau différent de la section de formation d'ébauche (4) et/ou de la section corps (2), où le matériau est élastique et/ou flexible.
  14. Piston de cintrage selon la revendication 9 où la coupe transversale du corps (2) longitudinal est quadratique, rectangulaire, ovale ou elliptique.
EP18154878.5A 2017-02-02 2018-02-02 Piston de cintrage Active EP3357597B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18154878T PL3357597T3 (pl) 2017-02-02 2018-02-02 Tłok gnący

Applications Claiming Priority (1)

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DKPA201770061 2017-02-02

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EP3357597A1 EP3357597A1 (fr) 2018-08-08
EP3357597B1 true EP3357597B1 (fr) 2022-01-12

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EP18154878.5A Active EP3357597B1 (fr) 2017-02-02 2018-02-02 Piston de cintrage

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EP (1) EP3357597B1 (fr)
DK (1) DK3357597T3 (fr)
ES (1) ES2910939T3 (fr)
LT (1) LT3357597T (fr)
PL (1) PL3357597T3 (fr)
PT (1) PT3357597T (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111659773A (zh) * 2020-06-28 2020-09-15 无锡先导智能装备股份有限公司 折弯设备
CN112222241A (zh) * 2020-09-21 2021-01-15 宁波北仑百晟钣金件制造有限公司 一种钣金件的冲压与折弯成型工艺

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1265553B1 (it) * 1993-02-08 1996-11-22 Sipa Spa Procedimento e macchina perfezionati di presso-piegatura
DE10223637B4 (de) * 2002-05-28 2007-11-08 Pass Stanztechnik Ag Biege-Werkzeug

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Publication number Publication date
ES2910939T3 (es) 2022-05-17
EP3357597A1 (fr) 2018-08-08
DK3357597T3 (da) 2022-04-19
PT3357597T (pt) 2022-03-16
LT3357597T (lt) 2022-03-10
PL3357597T3 (pl) 2022-06-06

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