EP0383176A1 - Cintrage de tôles - Google Patents

Cintrage de tôles Download PDF

Info

Publication number
EP0383176A1
EP0383176A1 EP90102389A EP90102389A EP0383176A1 EP 0383176 A1 EP0383176 A1 EP 0383176A1 EP 90102389 A EP90102389 A EP 90102389A EP 90102389 A EP90102389 A EP 90102389A EP 0383176 A1 EP0383176 A1 EP 0383176A1
Authority
EP
European Patent Office
Prior art keywords
plate
tool
folding
blade
folding device
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
EP90102389A
Other languages
German (de)
English (en)
Other versions
EP0383176B1 (fr
Inventor
Giovanni Ronda
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.)
MECSTAR Srl
Original Assignee
MECSTAR Srl
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 MECSTAR Srl filed Critical MECSTAR Srl
Priority to AT90102389T priority Critical patent/ATE85541T1/de
Publication of EP0383176A1 publication Critical patent/EP0383176A1/fr
Application granted granted Critical
Publication of EP0383176B1 publication Critical patent/EP0383176B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • the present invention relates to a plate folding device.
  • the field of application of the present invention is the field of folding devices with a blade and a counter-blade which have respective active portions which cooperate to fold a plate; said devices are used in the manufacture of panels with folded edges intended for the production of metallic furniture, refrigerators, washing machines, radiators, convectors and similar products.
  • the plate is supported by a steel profiled element which is upwardly provided with a plurality of grooves which define forming seats or dies which can he coupled to a series of complementarily shaped punches so as to draw an interposed plate.
  • the plate is manually retained against the die, in a more or less stable manner, and the final folding angle being determined by the shape of the die and of the punch and by the value of the stroke of the two coupling elements.
  • Another known device comprises a plate clamping structure, constituted by a pair of opposite jaws actuated by one or more hydraulic cylinders and by a folding blade which is mounted so as to be slidable laterally to said clamping structure and is adapted to interfere with the plate during its relative sliding motion, thus deforming said plate by flexing.
  • the final folding angle may be modified either by varying the distance of the blade with respect to the clamping structure and the useful stroke of said forming blade.
  • the folding blade can also move perpendicularly to the main sliding direction, so that it can partially overlap the folding edge, thus allowing folding angles greater than 90°.
  • This variated aspect has the disadvantage that up to three hydraulic cylinders are required to actuate the device, the first of which is required to actuate the clamping structure, the second to move the forming tool along the main sliding direction and the third to move the forming blade transversely to the main sliding direction. Owing to the considerable complexity of the resulting motion of the blade and of the considerable forces involved, the correct operation of said device requires sophisticated and delicate control means which have a very high cost and are extremely difficult as regards maintenance.
  • a folding device associable with a conventional press which comprises all the features stated in the pre-characterizing part, of claim 1.
  • said known device has a folding blade which comprises a rotating tool consisting of a roller with a lateral groove, both edges whereof act on the plate, which is at least partially urged by a fixed counter-­blade.
  • a plate presser acts laterally to the folding surfaces.
  • the aim of the present invention is to provide a folding device which is very easy to manufacture and precise in operation, eliminating the above described disadvantages of the prior art.
  • an object of the invention is to provide a device which allows to produce folds with a wide range of curvature radii and of folding angles, even considerably greater than 90°, by means of extremely limited replacements of its basic components.
  • Another object of the invention is to provide a folding device which ensures the accurate adjustment of the folding parameters.
  • a further object of the invention is to provide a highly reliable device with easy maintenance, obtained starting from commonly commercially available components.
  • a plate folding device comprising a folding blade and a folding counter-blade which can be moved mutually closer or further apart, to determine, upon coupling thereof, the folding of a plate
  • said blade being consisting of an abutment element for a plate portion adjacent to the folding edge
  • said counter-blade being consisting of a supporting cradle which rotatably supports a folding tool
  • said tool substantially comprising a roller which has a longitudinal groove which defines, peripherally to said roller, two longitudinal and mutually angularly spaced edge portions, characterized in that it comprises a plate presser element slidably mounted between said abutment element and said tool so as to result at least partially aligned with both, said plate presser element interacting, when said blade and counter-blade approach one another, simultaneously with the plate on one side, to lock it against said abutment element, and with one of said longitudinal edge portions of said tool on the other, to cause said tool to rotate in
  • the device according to the invention comprises a folding blade, generally indicated by 2, and a folding counter-blade, generally indicated by 3.
  • the blade 2 comprises an abutment element 11 which is adapted to contrast a portion of the plate and is generally wedge-shaped with a substantially horizontal wall 13 and an inclined wall 12 with an angle which is smaller than the final folding angle of the plate to be obtained, to take into account the elastic hysteresis of the material.
  • the tip edge 12 is rounded, and its radius of curvature is indicated by RC in figure 2.
  • the counter-blade 3 is defined by a folding tool 4 which is substantially constituted by a roller with an outer diameter DS, which can rotate freely about its own axis 7 in a cradle 5 provided in a rigid support 6.
  • the roller 4 advantageously has a lateral groove 8 which extends parallel to its axis of rotation.
  • Said groove 8 has a curved profile which will be described in greater detail hereinafter, so that the tool has, as a whole, an approximately "C"-shaped transverse cross section.
  • the longitudinal edge portions 9, 10 formed by the groove 8 are angularly spaced and conveniently rounded with curvature radii respectively indicated by RL and RR in figure 2.
  • the blade 2 and the counter-blade 3 may be associated with a conventional press or with a machine conceived specifically for this purpose, which are not illustrated in the figures since they do not relate to the present invention.
  • the blade 2 may be conveniently fixed to the movable punch-holder of the press, while the counter-blade 3 can be rigidly fixed to its fixed table.
  • a kinematically reversed arrangement, in which the blade is fixed and the counter-blade is movable, is evidently to be considered technically equivalent and therefore equally acceptable in terms of the description of the invention.
  • a plate presser element 15 is interposed between the blade 2 and the counter-blade 3, said presser element being movable vertically, for example by means of a sliding rod 16 which is fixed to the element 15 by means of a threaded coupling 26 and is guided by a through hole 17 provided in the support 6.
  • the plate presser element 15 has an upper plate-supporting surface 18 which is substantially parallel to the wall 13 of the abutment element 11 so as to lock a plate 19 there against, a lower surface 20, intended to interact with the edge 9 of the folding tool 4, and an end portion 21 adapted to co-operate with the groove 8 of the tool 4.
  • the contact between the surface 20 and the edge 9 of the tool occurs substantially along a generatrix of said edge and is a partially rolling, partially scraping contact. From this arrangement it is evident that the lowering of the plate presser element 15 causes the tool 4 to rotate clockwise. Between the plate presser element 15 and the support 6 may be interposed an elastic return means, consisting for example, of a compression spring 25 which raises the plate presser element 15 when the blade 2 moves away from the counter-blade 3 so as to prepare the device for a next folding operation.
  • an elastic return means consisting for example, of a compression spring 25 which raises the plate presser element 15 when the blade 2 moves away from the counter-blade 3 so as to prepare the device for a next folding operation.
  • the upward stroke of the plate presser element 15 is limited by an enlarged end portion 23 of the guiding rod 16 which abuts against the annular edge 24 of the guiding hole 17, the distance of said enlarged portion 23 from the surface 20 being adjustable by rotating it about its axis.
  • the groove 8 of the folding tool 4 has a curved profile 27 determined by the envelope of the successive positions of the end portion 21 of the plate presser element 15 during the rotation of the tool up to a final position in which the end portion 21 perfectly matches the bottom of the groove. In this manner, when the plate presser element 15 rises due to the spacing of the blade 2 from the counter-blade 3, the end portion 21 exerts on the tool 4 an anti-clockwise rotational torque which tends to lower the edge 10 of the tool to the same level as the upper face 17 of the plate presser element 15.
  • the aperture angle ⁇ defined by a pair of radial planes which are tangent to the longitudinal edges 9, 10 may be determined according to the folding angle and to the diameter of the tool, and depends on the thickness P of the plate presser element.
  • the contact surfaces of the edges 9, 10 and of the surface 20 are formed with such a surface finish as to ensure a friction coefficient of approximately 0,15 between the tool and the plate presser and of approximately 0,25 between the tool and the plate.
  • the optimum ratio between the average thickness S of the plate and the diameter DS has been found to be comprised between 0,20 and 0,50.
  • radii of curvature RL and RR of the longitudinal edges 9, 10 greater values of said radii correspond to smaller values of the pressures of contact with the contiguous elements, however, excessive values of said radii limit the width of the related folding angles, all other factors being equal.
  • optimum values of said radii may be comprised between 1/8th and 1/24th of the diameter DS of the tool, and preferably between 1/12th and 1/20th of said diameter.
  • the position of the abutment element 11 may be conveniently changed to provide a considerable range of folding angles obtainable with the same geometry of the abutment element 11.
  • the abutment element 11 can be moved horizontally and vertically by means of appropriate adjustment means, in order to modify, respectively, the distances XC and YC of the center of the radius of curvature RC of the vertex 12. It is evident that the same effect may be achieved by moving the support 6 at rest along horizontal and vertical directions by virtue of adjustment means schematically indicated by the actuation screws 28 and 29 in figure 1.
  • the radius RC at the vertex of the abutment element 11 may vary according to the required folding angle and is mostly determined according to the properties of the material to be folded. With materials which have a modest increase in resistance immediately after the yield phase, the radius RC must in fact be preset rather accurately, while with materials which have a high increase in resistance with work-hardening immediately after yielding, such as normal steels with a high carbon content, the radius RC may even be close to zero, since the work-hardened material itself progressively "creates" successive folding edges.
  • a plate 19 is initially deposited on the plate presser 15, the upper surface whereof is approximately at the same level as the edge 10 of the tool, and the lower surface 20 whereof is kept raised by the spring 25 and skims the edge 9 of the tool 4.
  • the abutment element 11 is spaced from the plate 18.
  • the abutment element 11 is subsequently lowered by exerting appropriate compression forces, indicated by the arrow F in figure 1, and locks the plate 18 against the plate presser element 15.
  • Said plate presser element in turn moves the edge 9 of the tool 4 downwards, transmitting thereto a clockwise rotational torque, so that its edge 10 bends the plate along the folding edge defined by the tip edge 12 of the abutment element 11.
  • the angle of the fold and its inner profile may be preset by appropriately locating the vertex 12 of the abutment element 11 by means of adjustments of the actuation screws 28 and 29.
  • the device according to the invention fully achieves the intended aim, since it is very simple in construction and very precise in operation, and it furthermore allows to produce folds with a wide range of folding angles, using a very limited series of abutment elements 11 and tools 4.
  • the final configuration of the executed fold is furthermore easily and precisely adjustable, while friction is minimized, consequently reducing operating power.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP90102389A 1989-02-15 1990-02-07 Cintrage de tôles Expired - Lifetime EP0383176B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90102389T ATE85541T1 (de) 1989-02-15 1990-02-07 Vorrichtung zum biegen von blechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8552689 1989-02-15
IT8985526A IT1234492B (it) 1989-02-15 1989-02-15 Dispositivo per piegatura lamiere.

Publications (2)

Publication Number Publication Date
EP0383176A1 true EP0383176A1 (fr) 1990-08-22
EP0383176B1 EP0383176B1 (fr) 1993-02-10

Family

ID=11327526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90102389A Expired - Lifetime EP0383176B1 (fr) 1989-02-15 1990-02-07 Cintrage de tôles

Country Status (4)

Country Link
EP (1) EP0383176B1 (fr)
AT (1) ATE85541T1 (fr)
DE (1) DE69000880D1 (fr)
IT (1) IT1234492B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5404742A (en) * 1993-07-09 1995-04-11 Ready Tools Inc. Rotary hemming device
FR2717109A1 (fr) * 1994-03-08 1995-09-15 Jeandeaud Jean Claude Dispositif de pliage d'une tôle le long d'une ligne droite.
EP0699489A1 (fr) * 1993-06-25 1996-03-06 UMIX Co., Ltd. Procédé pour former de la tÔle mince et matrice de formage
WO1996024445A1 (fr) * 1995-02-06 1996-08-15 Amada Company, Ltd. Machine a cintrer les toles
EP2237903A2 (fr) * 2007-12-18 2010-10-13 Scott Technology Limited Appareil de pliage de métal
FR2982512A1 (fr) * 2011-11-15 2013-05-17 Peugeot Citroen Automobiles Sa Dispositif de pliage d'une tole pour une presse
FR2985441A1 (fr) * 2012-01-09 2013-07-12 Peugeot Citroen Automobiles Sa Systeme a came pour le pliage d'une tole
CN111014463A (zh) * 2019-12-26 2020-04-17 浙江博秦精密工业有限公司 一种一次性折负角的模具
DE102019119848A1 (de) * 2019-07-23 2021-01-28 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkzeug und Verfahren zum Bearbeiten von plattenförmigen Werkstücken, insbesondere Blechen
CN114192667A (zh) * 2022-02-16 2022-03-18 泱焓冷链***(江苏)有限公司 用于冰箱门壳的折弯包角设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112792186B (zh) * 2021-01-04 2024-01-12 马鞍山嘉力机械制造有限公司 一种简易的气动折边机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002049A (en) * 1975-06-09 1977-01-11 Ready Stamping System, Inc. Forming tool for use in a die assembly
FR2365383A1 (fr) * 1976-09-22 1978-04-21 Eckold Vorrichtung Appareil a main, actionne par un moteur, pour former le bord de tole
DE3509052A1 (de) * 1985-03-14 1986-09-18 Uniplanung Metall- und Kunststoffengineering GmbH & Co KG, 7552 Durmersheim Vorrichtung zum abkanten von blechteilen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002049A (en) * 1975-06-09 1977-01-11 Ready Stamping System, Inc. Forming tool for use in a die assembly
FR2365383A1 (fr) * 1976-09-22 1978-04-21 Eckold Vorrichtung Appareil a main, actionne par un moteur, pour former le bord de tole
DE3509052A1 (de) * 1985-03-14 1986-09-18 Uniplanung Metall- und Kunststoffengineering GmbH & Co KG, 7552 Durmersheim Vorrichtung zum abkanten von blechteilen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699489A1 (fr) * 1993-06-25 1996-03-06 UMIX Co., Ltd. Procédé pour former de la tÔle mince et matrice de formage
US5404742A (en) * 1993-07-09 1995-04-11 Ready Tools Inc. Rotary hemming device
FR2717109A1 (fr) * 1994-03-08 1995-09-15 Jeandeaud Jean Claude Dispositif de pliage d'une tôle le long d'une ligne droite.
WO1996024445A1 (fr) * 1995-02-06 1996-08-15 Amada Company, Ltd. Machine a cintrer les toles
EP2237903A2 (fr) * 2007-12-18 2010-10-13 Scott Technology Limited Appareil de pliage de métal
EP2237903A4 (fr) * 2007-12-18 2014-12-24 Scott Technology Ltd Appareil de pliage de métal
FR2982512A1 (fr) * 2011-11-15 2013-05-17 Peugeot Citroen Automobiles Sa Dispositif de pliage d'une tole pour une presse
FR2985441A1 (fr) * 2012-01-09 2013-07-12 Peugeot Citroen Automobiles Sa Systeme a came pour le pliage d'une tole
DE102019119848A1 (de) * 2019-07-23 2021-01-28 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkzeug und Verfahren zum Bearbeiten von plattenförmigen Werkstücken, insbesondere Blechen
US11850650B2 (en) 2019-07-23 2023-12-26 TRUMPF Werkzeugmaschinen SE + Co. KG Tool and method for processing plate-shaped workpieces, in particular metal sheets
CN111014463A (zh) * 2019-12-26 2020-04-17 浙江博秦精密工业有限公司 一种一次性折负角的模具
CN114192667A (zh) * 2022-02-16 2022-03-18 泱焓冷链***(江苏)有限公司 用于冰箱门壳的折弯包角设备

Also Published As

Publication number Publication date
DE69000880D1 (de) 1993-03-25
IT8985526A0 (it) 1989-02-15
IT1234492B (it) 1992-05-18
ATE85541T1 (de) 1993-02-15
EP0383176B1 (fr) 1993-02-10

Similar Documents

Publication Publication Date Title
EP0383176B1 (fr) Cintrage de tôles
EP0023894B1 (fr) Presse à plier pour la réalisation de plis à la périphérie de tôles
US5253502A (en) Apparatus and method for bending and forming sheet material
US20090056406A1 (en) Articulated bending brake for sheet metal forming
JP5208973B2 (ja) オープンシーム管に成形される金属薄板の縁帯を曲げる方法および曲げプレス
WO2006054596A1 (fr) Procédé de cambrage, et filière et machine de cambrage utilisées pour le procédé de cambrage
CN110405028A (zh) 一种用于在金属板中形成波纹的折叠装置
CN201346591Y (zh) 电子元器件针脚弯曲模具
EP1009557A1 (fr) Presse a cintrer pour tole metallique
EP3706930B1 (fr) Machine à plier
CN207521497U (zh) 可升降的折弯机后挡料机构
US6604397B2 (en) Rollforming machine
CN211247832U (zh) 一种五金冲压件折弯装置
US6065324A (en) Rotary bender die
CN211276193U (zh) 一种可调整冲压件折弯角度的冲压模具
WO1985000766A1 (fr) Ameliorations a des plieuses
CN115355814B (zh) 一种钢板弹簧平面度检测设备
EP0441436B1 (fr) Unité de pliage d'une machine à cintrer les tôles
CN215355490U (zh) 一种可翻板模具
CN209021071U (zh) 一种冲压机用管材压弯模具
WO2003053620A1 (fr) Ensemble matrice a decouper
US4672835A (en) Apparatus for bending sheet material
CN112845709B (zh) 一种桥架折弯装置及生产线
CN213316961U (zh) 延展性板材的定角折弯模具总成
CN218835654U (zh) 一种能够适应多种钢板厚度的钢板压平机

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19901127

17Q First examination report despatched

Effective date: 19920518

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930210

Ref country code: NL

Effective date: 19930210

Ref country code: LI

Effective date: 19930210

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19930210

Ref country code: FR

Effective date: 19930210

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19930210

Ref country code: DE

Effective date: 19930210

Ref country code: CH

Effective date: 19930210

Ref country code: BE

Effective date: 19930210

Ref country code: AT

Effective date: 19930210

REF Corresponds to:

Ref document number: 85541

Country of ref document: AT

Date of ref document: 19930215

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: ING. ZINI MARANESI & C. S.R.L.

REF Corresponds to:

Ref document number: 69000880

Country of ref document: DE

Date of ref document: 19930325

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940228

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050207