EP0610706B1 - Amélioration dans une méthode de pliage des tÔles et machine associée - Google Patents

Amélioration dans une méthode de pliage des tÔles et machine associée Download PDF

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Publication number
EP0610706B1
EP0610706B1 EP94100971A EP94100971A EP0610706B1 EP 0610706 B1 EP0610706 B1 EP 0610706B1 EP 94100971 A EP94100971 A EP 94100971A EP 94100971 A EP94100971 A EP 94100971A EP 0610706 B1 EP0610706 B1 EP 0610706B1
Authority
EP
European Patent Office
Prior art keywords
blank
bending
piston
holder means
knife
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.)
Expired - Lifetime
Application number
EP94100971A
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German (de)
English (en)
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EP0610706A1 (fr
Inventor
Ireneo De Nardi
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.)
SIPA Industrializzazione Progettazione e Automazione SpA
Original Assignee
SIPA Industrializzazione Progettazione e Automazione SpA
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Publication of EP0610706A1 publication Critical patent/EP0610706A1/fr
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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
    • 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
    • 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

  • This invention relates to a new sheet-metal bending process for metal plates, in particular to make bends with a greater angle than 90° in the butt-end or edge portion of sheet-metal plates with an elongated shape, as performed preferably by numerical-control (NC) presses, as well as the machines arranged to carry out such a process.
  • NC numerical-control
  • Such a technology is substantially based on the following fabrication cycle, which is briefly outlined below in order to facilitate a comparison with the cycle according to the present invention, which will be described further on.
  • JP 59-33032 a bending machine is known which is able to bend a long sheet by using a punch which is equipped with a cam mechanism and has an inclined shape.
  • This machine needs also a plurality of punch guides 6 what turns the machine more complicate, less compact and less flexible.
  • the process according to the present invention is based essentially on the fact that the bending operation is performed in three distinct phases, wherein a blank-holder is lowered in the first phase, by means of an appropriate motor-driven piston, on to the plate to be bent so as to keep it firmly between said blank-holder and an appropriate anvil , wherein in the second phase the continuation of said downward displacement of the piston that caused the blank-holder to go down causes a knife to be pushed downward, the lower end of said knife abutting then against the sheet-metal plate to be bent and causing it to therefore rotate around an appropriate edge of said anvil so as to cause said plate to undergo a first 90°-bending, and wherein in the third phase the continued downward movement of said piston forces the rotation and the consequential lowering of said knife so that one of its ends presses on the bent side of the sheet-metal plate, thereby causing it to further bend around the corresponding inclined and re-entrant edge of the anvil, as this is apparent from the illustrations in the Figures and the following description of the machine.
  • the sheet-metal plate 1 is laid upon the anvil 2.
  • the blank-holder 4 and the piston 3 are separated by a free space of mutual displacement and are connected by a spring 5 and a pin 5a whose purpose, operation and peculiarities will be further explained later on.
  • the body of the piston 3 is raised and, therefore, both the spring 5 of the blank-holder 4, arranged between said blank-holder and the piston 3, and the spring 14 contrasting the knife 11, arranged between the lever 11a of said knife and the piston 3, are extended, ie. relaxed, since they work as compression springs.
  • the knife 11 and its actuation lever 11a are connected with the piston 3 through the rod 10 that is fixedly provided on said piston, said rod being the force transmitting element that actually causes said knife and said lever to rotate with respect to the piston 3.
  • the thrust pin 6 which is firmly associated with the blank-holder on its upper portion, lies at the bottom end of its stroke with respect to the piston 3, the blank-holder 4 lies in a raised position with respect to the sheet-metal plate 1, while the knife 11, which is at rest, lies in a substantially vertical position, rotated to its clockwise uttermost position, due to the action of the spring 14 that pushes the actuation lever 11a against an appropriate abutment (not shown) situated on the piston 3.
  • the lower end 12 of said knife 11 is separated from the sheet-metal plate by a distance which is greater than the distance separating the same plate from the lower surface of the blank-holder 4.
  • said terminal tip of the knife imparts an anti-clockwise rotary thrust to the same edge portion in such a way that said edge portion (1b) of the plate undergoes further bending about the edge of the anvil toward the reentrant inclined edge 15, however without touching the latter, and takes therefore the desired inclination which, apart from the sizing of the various afore described components, will also depend on the particular sequencing of the various actuators and movements of the machine, as made possible by the numerical-control technology.
  • This process in conjunction with the described machine, enable following further advantages to be achieved: simpler bending process, shorter bending times, use of a single anvil for a greater number of inclination or bending angles, easier programming of the whole machine by using the possibilities offered in this connection by the numerical-control technology, simpler and easier implementation of the process, greater operational safety and reliability.

Claims (4)

  1. Machine de pliage pour plier une plaque de matière façonnable à la presse, comprenant des moyens (4) de maintien d'ébauche pour maintenir fermement la plaque (1) sur le plan horizontal entre lesdits moyens de maintien d'ébauche et une enclume (2) appropriée, et un outil en forme de couteau (11) pour pratiquer l'opération de pliage, ledit outil (11) étant capable d'effectuer une première phase de pliage par un mouvement de pure translation et une deuxième phase de pliage par un mouvement combiné de translation et de rotation, dans laquelle, dans la première phase de pliage, la partie de bord de la plaque est pliée d'un angle de 90° et, dans la deuxième phase de pliage, l'angle de pliage est augmenté jusqu'à un angle quelconque supérieur à 90°, et comprenant un piston de commande (3) qui est relié auxdits moyens de maintien d'ébauche (4) par un autre ergot (5a) qui permet seulement audit piston (3) de se déplacer perpendiculairement auxdits moyens de maintien d'ébauche, caractérisée en ce que
    - l'outil en forme de couteau (11) est lié rigidement à un levier de commande (11a) tournant sur une tige (10) dont la position est fixe par rapport audit piston de commande (3),
    - ledit levier (11a) s'étend dans un interstice entre ledit piston et lesdits moyens de maintien d'ébauche (4),
    - ledit levier est actionné par prise de la tête d'un ergot (6), monté sur les moyens de maintien d'ébauche ou le levier, avec l'autre des moyens de maintien d'ébauche et du levier.
  2. Machine de pliage selon la revendication 1, caractérisée en ce qu'un premier ressort (5) est prévu pour maintenir séparé de manière élastique le piston (3) des moyens de maintien d'ébauche (4) et un deuxième ressort (14) est prévu pour maintenir séparé de manière élastique le piston (3) de la partie du levier opposée à la partie de liaison dudit outil en forme de couteau.
  3. Machine de pliage selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit outil en forme de couteau (11) est muni d'une face inférieure (12) qui est substantiellement plane, et son extrémité (13) orientée en direction desdits moyens de maintien d'ébauche présente un angle aigu.
  4. Machine de pliage selon la revendication 3, caractérisée en ce que la distance entre le bord inférieur (12) et la plaque (1) est inférieure à la distance entre les points de contact correspondants sur la tête (7) dudit ergot (6) et la butée (8) dudit levier (11a), lorsque ledit piston de commande (3) est dans la position la plus haute possible.
EP94100971A 1993-02-08 1994-01-24 Amélioration dans une méthode de pliage des tÔles et machine associée Expired - Lifetime EP0610706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN930005 1993-02-08
IT93PN000005A IT1265553B1 (it) 1993-02-08 1993-02-08 Procedimento e macchina perfezionati di presso-piegatura

Publications (2)

Publication Number Publication Date
EP0610706A1 EP0610706A1 (fr) 1994-08-17
EP0610706B1 true EP0610706B1 (fr) 1996-10-09

Family

ID=11394744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100971A Expired - Lifetime EP0610706B1 (fr) 1993-02-08 1994-01-24 Amélioration dans une méthode de pliage des tÔles et machine associée

Country Status (5)

Country Link
EP (1) EP0610706B1 (fr)
AT (1) ATE143839T1 (fr)
DE (1) DE69400647T2 (fr)
ES (1) ES2095687T3 (fr)
IT (1) IT1265553B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108480425A (zh) * 2018-04-17 2018-09-04 张玉芙 全自动折弯机及折弯方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502004004723D1 (de) * 2004-04-06 2007-10-04 Trumpf Maschinen Austria Gmbh Biegewerkzeug zum Biegen von Werkstücken, insbesondere von Blechen sowie Biegemaschine mit einem derartigen Biegewerkzeug
CN102294399A (zh) * 2011-06-30 2011-12-28 江苏科行环境工程技术有限公司 电除尘器阳极板卡套加工装置
CN104190757B (zh) * 2014-08-22 2016-06-01 上海元阳金属制品有限公司 折弯机
CN106001271A (zh) * 2016-06-22 2016-10-12 苏州天朋精密元器件有限公司 一种折弯模具
DE102016118175B4 (de) * 2016-09-26 2018-08-23 Trumpf Werkzeugmaschinen Gmbh & Co. Kg Werkzeugmaschine und Verfahren zum Bearbeiten von plattenförmigen Werkstücken
ES2910939T3 (es) * 2017-02-02 2022-05-17 K A Holding Stoevring Aps Pistón de doblado
CN109127895B (zh) * 2017-06-15 2023-07-25 嘉意机床（上海）有限公司 一种折弯机翻向成形模具及方法
IT201900009657A1 (it) * 2019-06-20 2020-12-20 Dallan Spa Macchina piegatrice per lamiere e metodo di piegatura di lamiere
EP3932577A1 (fr) * 2020-07-03 2022-01-05 Schröder Maschinenbau GmbH Outil d'angle pour une machine de pliage en continu
CN113083952B (zh) * 2021-03-18 2023-05-23 北京中防恒立人防设备有限公司 一种高端设备制造冷轧钢弯折设备

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2523483B1 (fr) * 1982-03-19 1985-09-27 Pauzin Alexis Outil de pliage a plat
JPS5933032A (ja) * 1982-08-16 1984-02-22 Hitachi Ltd 薄板の折り曲げ金型

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108480425A (zh) * 2018-04-17 2018-09-04 张玉芙 全自动折弯机及折弯方法
CN108480425B (zh) * 2018-04-17 2019-07-09 张玉芙 全自动折弯机及折弯方法

Also Published As

Publication number Publication date
ATE143839T1 (de) 1996-10-15
EP0610706A1 (fr) 1994-08-17
ES2095687T3 (es) 1997-02-16
IT1265553B1 (it) 1996-11-22
ITPN930005A0 (it) 1993-02-08
ITPN930005A1 (it) 1994-08-08
DE69400647T2 (de) 1997-05-07
DE69400647D1 (de) 1996-11-14

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