EP0096278A2 - Procédé de pliage de tôle et dispositif pour la mise en oeuvre dudit procédé - Google Patents

Procédé de pliage de tôle et dispositif pour la mise en oeuvre dudit procédé Download PDF

Info

Publication number: EP0096278A2
Authority: EP; European Patent Office
Prior art keywords: bending; punch; sheet; sheet metal; during
Prior art date: 1982-06-07
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

EP83105076A

Other languages

German (de)

English (en)

Other versions

EP0096278B1 (fr

EP0096278A3 (en

Inventor

Eduard Hänni

Theo Frei

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.)

Haemmerle AG Maschinenfabrik

Original Assignee

Haemmerle AG Maschinenfabrik

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.)

1982-06-07

Filing date

1983-05-21

Publication date

1983-12-21

1983-05-21 Application filed by Haemmerle AG Maschinenfabrik filed Critical Haemmerle AG Maschinenfabrik

1983-12-21 Publication of EP0096278A2 publication Critical patent/EP0096278A2/fr

1985-01-30 Publication of EP0096278A3 publication Critical patent/EP0096278A3/de

1987-03-25 Application granted granted Critical

1987-03-25 Publication of EP0096278B1 publication Critical patent/EP0096278B1/fr

Status Expired 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
- 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
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- 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
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S72/00—Metal deforming
- Y10S72/702—Overbending to compensate for springback

Definitions

the invention relates to a method for bending sheet metal with a punch and a die, into which the punch penetrates more or less depending on the bending angle.
the bending angle is determined by the height of the stamp edge with respect to the support points in the die.
this layer must lie within a tolerance of a few hundredths of a millimeter along the entire edge length, since a deviation of 0.04 mm already results in an error of 1 °. This requires a very precise maintenance of the lower end position of the bending die and the exact compensation of the machine and tool errors.
the proposal to determine the position of the punch by a height adjustment of the die base made a significant simplification and improvement, thereby eliminating all machine-side influences on the bending angle.
the desired angle can be easily and repeatedly determined by adjusting the height of the die base.
the aim of the invention is to remedy this disadvantage and to propose a method by means of which the penetration depth can be determined exactly in accordance with the angle to be achieved in such a way that the individual variable sheet properties are taken into account.
the proposed method of the type mentioned at the outset is characterized in that the size and the course of the bending force required during the deformation of the sheet metal piece are determined and used to determine the depth of penetration.
the device for performing the method has a bending punch and a die, into which the bending punch penetrates more or less depending on the bending angle.
a measuring device for continuously determining the forces occurring in the punch during the deformation of the sheet metal piece is present in the bending punch, which measuring device is connected to a computer that influences the feed of the punch.
the calculator can also be used to control the height of the Be coupled to the die bottom.
the bending angle a of the support edges is determined by the position of the edge 1 of the B iegest Zis 2 determined with respect to 3 and 4, the die 5. This position is given by the depth of penetration h.
the sheet 6 is bent with a radius 7, which differs depending on the sheet properties is, even with sheet metal of equal quality; which were manufactured by different manufacturers or at different times. It follows that with a constant penetration depth h of the punch 2, even when using the same die 5 with the support edges 3 and 4, the angle a does not remain the same, but changes. If the force curve is now recorded in function of the path, curves 10, 11 and 12 of FIG. 2 are obtained for different but qualitatively equivalent sheets, the path meaning the penetration depth h.
FIG. 3 shows the dependence of the bending angle a on the penetration depth for different sheets 10, 11 and 12.
a smaller depth of penetration is sufficient for sheet 12
a greater depth of penetration is required for sheet 11 than for sheet 10.
the size and the course of the required bending force are therefore measured in the bending punch and a computer is fed with the measured values, which individually determines the penetration depth for the sheet in question and influences the punch feed accordingly.
a sheet In use, a sheet is bent exactly to the desired angle during a test run and the size and the course of the bending force are stored in the punch in function of the penetration depth during the bending process. When bending another sheet, the force curve is compared with the stored force curve and the differences are used to correct the penetration depth.
a bending punch 20 which consists of an upper part 21 and a lower part 22.
the two parts 21 and 22 each have a cavity half 23 and 24 on their mutually facing sides which together form a cavity for receiving a measuring device 25.
This can, for example, as an electrical
a so-called strain gauge can also be used.
On the lower part 22 of the stamp a guide rail 26 is fastened on both sides with screws 27 to laterally support and guide the upper part 21.
the upper stamp part 21 is clamped at 28 in the usual manner in the stamp holder of a hydraulic press.
the pressure exerted on the upper stamp part 21 is passed on in this way via the measuring device 25 to the lower part 22 with a bending edge 29.
the measuring device determines the force currently exerted.
the measured values are registered and processed in a computer. This can either be the stroke of the stamp e.g. influence directly or, if a die with an adjustable die bottom is used, act on the adjusting device of the die bottom, which is then brought into the position which corresponds to the desired bending angle, taking into account the individual sheet properties.
the punch is divided into short pieces in the longitudinal direction, which is often necessary so that the entire length of the edge is driven evenly, it is sufficient it to provide a single stamp part with the measuring device mentioned, since the force distribution remains uniform along the entire edge length.
the described method and the device constitute a significant advance in sheet metal processing, in particular of thin sheets, which can be processed automatically with great precision, regardless of individual structural differences, without adjustment and correction work.

Landscapes

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

EP83105076A 1982-06-07 1983-05-21 Procédé de pliage de tôle et dispositif pour la mise en oeuvre dudit procédé Expired EP0096278B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
AT2207/82		1982-06-07
AT0220782A AT374706B (de)	1982-06-07	1982-06-07	Verfahren zum blechbiegen und biegeeinrichtung zur ausuebung des verfahrens

Publications (3)

Publication Number	Publication Date
EP0096278A2 true EP0096278A2 (fr)	1983-12-21
EP0096278A3 EP0096278A3 (en)	1985-01-30
EP0096278B1 EP0096278B1 (fr)	1987-03-25

Family

ID=3529999

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP83105076A Expired EP0096278B1 (fr)	1982-06-07	1983-05-21	Procédé de pliage de tôle et dispositif pour la mise en oeuvre dudit procédé

Country Status (7)

Country	Link
US (1)	US4552002A (fr)
EP (1)	EP0096278B1 (fr)
JP (1)	JPS58218327A (fr)
AT (1)	AT374706B (fr)
CA (1)	CA1199562A (fr)
DE (1)	DE3370448D1 (fr)
GB (1)	GB2122121B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2601603A1 (fr) *	1986-07-15	1988-01-22	Aripa	Procede de pliage auto-adaptatif.
WO1988001916A1 (fr) *	1986-09-17	1988-03-24	Cincinnati Incorporated	Systeme de commande adaptatif pour frein de presse hydraulique
EP0341211A3 (en) *	1988-05-03	1990-10-24	Haemmerle Ag	Method of bending sheet metal
WO1995005905A1 (fr) *	1993-08-27	1995-03-02	L.V.D. Company N.V.	Pliage adaptatif

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CA1335638C (fr) *	1987-12-04	1995-05-23	Kinshirou Naito	Methode et dispositif de commande de la course d'une presse
DE3842009C1 (fr) *	1988-11-22	1990-03-22	Kabelwerke Reinshagen Gmbh, 5600 Wuppertal, De
US5092026A (en) *	1989-09-22	1992-03-03	Molex Incorporated	Crimp height monitor
US5201204A (en) *	1992-08-31	1993-04-13	William Hinterman	Press counterbalance system
JP3363970B2 (ja) *	1993-10-15	2003-01-08	株式会社小松製作所	プレスブレーキのラム位置設定方法およびラム制御装置
NL1004193C2 (nl) *	1996-04-01	1997-10-02	Sjoerd Meijer	Werkwijze voor het bewerken van metaalplaat.
AT411022B (de) *	2002-02-27	2003-09-25	Juricek Christian Dipl Ing	Verfahren zur reduktion der biegewinkelfehler beim gesenkbiegen
US20040247925A1 (en) *	2003-06-06	2004-12-09	Cromwell Stephen Daniel	Method and system for adjusting a curvature of a load plate based on a target load
FR2863785B1 (fr) *	2003-12-11	2006-04-28	Airbus France	Dispositif de sertissage d'un contact sur un cable
ITPR20040088A1 (it) *	2004-12-13	2005-03-13	Schiavi Macchine Ind Spa	Metodo e dispositivo per la determinazione dello spessore o del ritorno elastico di un pezzo piegato con una pressa piegatrice.
DE102005012384A1 (de)	2005-03-17	2006-07-13	Siemens Ag	Verfahren zum Freibiegen
CN102708222B (zh) *	2006-08-31	2014-11-26	新日铁住金株式会社	回弹发生原因特定方法、回弹发生原因部位特定方法、回弹对策位置特定方法以及它们的装置

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3389432A (en) *	1966-04-18	1968-06-25	Cincinnati Shaper Co	Load indicating device for compacting press
US4010679A (en) *	1967-09-25	1977-03-08	International Measurement & Control Co.	Piezoelectric transducer sensor for use in a press
US3564883A (en) *	1968-07-30	1971-02-23	Cincinnati Shaper Co	Hydraulic press control
DE2044199C3 (de) *	1970-09-07	1974-12-05	Karl Mengele & Soehne Maschinenfabrik Und Eisengiesserei Guenzburg-Donau, 8870 Guenzburg	Winkelmeß- und Steuereinrichtung an Biege- insbesondere Freibiegemaschinen
SU564042A1 (ru) *	1975-01-10	1977-07-05	Экспериментальный научно-исследовательский институт кузнечно-прессового машиностроения	Устройство дл правки длинномерных цилиндрических деталей
FR2347992A1 (fr) *	1976-04-13	1977-11-10	Promecan Sisson Lehmann	Presse plieuse ou machine analogue
IT1072273B (it) *	1977-02-01	1985-04-10	Selecontrol Sas	Dispositivo per la rilevazione e regolazione di angoli di piega particolarmente adatto per presse-piegatrici
DE2715815A1 (de) *	1977-04-07	1978-10-19	Promecam Maschinen Gmbh	Einrichtung zur einstellung des biegewinkels fuer den automatischen betrieb von abkantpressen
CH629402A5 (de) *	1978-03-21	1982-04-30	Beyeler Machines Sa	Verfahren zum verstellen der eindringtiefe des stempels einer hydraulischen abkantpresse und hydraulische einrichtung zur ausfuehrung des verfahrens.
JPS54129573A (en) *	1978-03-31	1979-10-08	Amada Co Ltd	Stroke controller in bending machine
DD138514A1 (de) *	1978-08-31	1979-11-07	Harald Gross	Werkzeugueberwachungssystem
DE2901376B2 (de) *	1979-01-15	1980-10-30	Karl Mengele & Soehne Maschinenfabrik Und Eisengiesserei Gmbh & Co, 8870 Guenzburg	Steuereinrichtung an Freibiegemaschinen
DE2940635C2 (de) *	1979-10-06	1985-06-20	Fa. Muhr und Bender, 5952 Attendorn	Profilstahlschere, -stanze o.dgl.
DE3008701A1 (de) *	1980-03-07	1981-09-24	Johann 7057 Leutenbach Hess	Winkelmessvorrichtung fuer abkantpressen
US4408471A (en) *	1980-10-29	1983-10-11	Massachusetts Institute Of Technology	Press brake having spring-back compensating adaptive control
CA1181673A (fr) *	1980-12-09	1985-01-29	Naoaki Itano	Cintreuse
FR2498493A1 (fr) *	1981-01-26	1982-07-30	Rondolotti Ets	Tour de repoussage perfectionne

1982
- 1982-06-07 AT AT0220782A patent/AT374706B/de not_active IP Right Cessation
1983
- 1983-01-05 GB GB08300194A patent/GB2122121B/en not_active Expired
- 1983-05-21 DE DE8383105076T patent/DE3370448D1/de not_active Expired
- 1983-05-21 EP EP83105076A patent/EP0096278B1/fr not_active Expired
- 1983-05-30 JP JP58094231A patent/JPS58218327A/ja active Granted
- 1983-06-07 CA CA000429849A patent/CA1199562A/fr not_active Expired
1985
- 1985-02-14 US US06/701,649 patent/US4552002A/en not_active Expired - Fee Related

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2601603A1 (fr) *	1986-07-15	1988-01-22	Aripa	Procede de pliage auto-adaptatif.
WO1988001916A1 (fr) *	1986-09-17	1988-03-24	Cincinnati Incorporated	Systeme de commande adaptatif pour frein de presse hydraulique
EP0341211A3 (en) *	1988-05-03	1990-10-24	Haemmerle Ag	Method of bending sheet metal
WO1995005905A1 (fr) *	1993-08-27	1995-03-02	L.V.D. Company N.V.	Pliage adaptatif
BE1007424A5 (nl) *	1993-08-27	1995-06-13	Lvd Co	Adaptief plooien.
US5829288A (en) *	1993-08-27	1998-11-03	L.V.D. Company N.V.	Adaptive folding

Also Published As

Publication number	Publication date
ATA220782A (de)	1983-10-15
EP0096278B1 (fr)	1987-03-25
GB2122121B (en)	1985-11-20
US4552002A (en)	1985-11-12
JPS58218327A (ja)	1983-12-19
AT374706B (de)	1984-05-25
GB2122121A (en)	1984-01-11
JPH0116566B2 (fr)	1989-03-24
DE3370448D1 (en)	1987-04-30
CA1199562A (fr)	1986-01-21
EP0096278A3 (en)	1985-01-30
GB8300194D0 (en)	1983-02-09

Legal Events

Date	Code	Title	Description
1983-10-21	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
1983-12-21	AK	Designated contracting states	Designated state(s): BE CH DE FR IT LI NL SE
1984-11-28	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1985-01-30	AK	Designated contracting states	Designated state(s): BE CH DE FR IT LI NL SE
1985-05-22	17P	Request for examination filed	Effective date: 19850311
1986-05-28	17Q	First examination report despatched	Effective date: 19860415
1987-02-10	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1987-03-25	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): BE CH DE FR IT LI NL SE
1987-04-30	ET	Fr: translation filed
1987-04-30	REF	Corresponds to:	Ref document number: 3370448 Country of ref document: DE Date of ref document: 19870430
1987-06-12	ITF	It: translation for a ep patent filed
1988-01-28	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1988-01-28	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1988-03-16	26N	No opposition filed
1990-03-28	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: CH Payment date: 19900328 Year of fee payment: 8
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1991-11-30	BERE	Be: lapsed	Owner name: HAMMERLE A.G. Effective date: 19910531
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1995-01-31	EUG	Se: european patent has lapsed	Ref document number: 83105076.0 Effective date: 19911209

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