EP1120176A1 - Procédé de réglage de la course d'une presse-plieuse - Google Patents
Procédé de réglage de la course d'une presse-plieuse Download PDFInfo
- Publication number
- EP1120176A1 EP1120176A1 EP00810058A EP00810058A EP1120176A1 EP 1120176 A1 EP1120176 A1 EP 1120176A1 EP 00810058 A EP00810058 A EP 00810058A EP 00810058 A EP00810058 A EP 00810058A EP 1120176 A1 EP1120176 A1 EP 1120176A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- speed
- sheet
- physical parameter
- displacement
- thickness
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 238000012937 correction Methods 0.000 claims abstract description 13
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 238000005452 bending Methods 0.000 claims description 15
- 238000013459 approach Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000035515 penetration Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000021183 entrée Nutrition 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/532—Conductor
- Y10T29/53209—Terminal or connector
- Y10T29/53213—Assembled to wire-type conductor
- Y10T29/53235—Means to fasten by deformation
Definitions
- the present invention relates to a method for adjusting the stroke of a press brake comprising a movable deck supporting a punch, a fixed apron supporting a die, means for moving the movable deck relative to the fixed deck, the said means of movement based on fixed amounts of the fixed deck, measurement rules for measuring the displacement of the movable deck relative to at the uprights, at least one sensor measuring a parameter physics varying with the force exerted by said punch on a sheet placed on said matrix and a device folding movement control electronics controlling the speed of said movement of movement between a neutral point high and a bottom dead center and provided with a calculation means for correct the value of said bottom dead center according to the measurement of said displacement and of said physical parameter.
- Applicant's patent CH 686119 describes a press brake of this type.
- the force undergone by the amounts of a press under the effect of the thrust of the jacks causes amounts to bend, which can result in frame deformation up to 1-2mm.
- This bending changes the depth of penetration of the punch into the die, this which creates an error in the bending angle obtained on the part to be to fold.
- Another parameter likely to generate an error of the bending angle is the variability of the thickness of the sheet processed.
- One of the parameters is the nominal thickness of the sheet. introduced in the press brake control electronics during the initial stroke adjustment.
- the actual thickness of the sheet must be measured in principle every time by the operator. Indeed, the sheet steel manufacturers supply sheets of which the actual thickness varies from up to up to 10% of the nominal thickness value. If a sheet nominal thickness of 2mm must for example be bent at 90 ° in a 12mm V-shaped opening, a variation in thickness of ⁇ 10% will induce, if it is not corrected, a variation of the folding angle between 88 ° and 92 °.
- the operator should therefore before each folding operation measure the actual thickness of the sheet it will process and enter this data into the control electronics of the press brake so that it corrects the stroke of the slide.
- the purpose of the present invention is to provide a method of adjusting the stroke of a holding press brake account for variations in the actual thickness of the sheets processed, without requiring operator intervention.
- the invention provides a method such as defined input, in which the difference between the thickness sheet metal and the set value of the thickness of the sheet is measured by the electronic control device of the press by comparing the actual position of the displacement, to which occurs a predetermined variation of a parameter physics varying with the force exerted by the punch on the sheet placed on the matrix, with the theoretical position of the displacement where this predetermined variation should occur produce, and in which the electronic device of command calculates a correction for the bottom dead center taking account for this difference in thickness.
- the speed of movement is reduced to a measurement acquisition speed (vam), lower than a predetermined folding speed (vl), when the punch is at a predetermined distance from the level theoretical plate pinching greater than the tolerance of thickness ⁇ e for manufacturing said sheet, and the speed of movement increases to said speed of folding after detection of said predetermined variation ⁇ p of said physical parameter (p).
- the movement of the movable platform takes place at approach speed from top dead center to a safety distance predetermined with respect to the theoretical level of pinching, that is to say the level reached by the deck during its lowering, where the sheet begins to be pinched between punch and matrix, distance where the speed is reduced to a speed of folding; the speed of movement of the deck is again reduced to a measurement acquisition speed, to a measurement acquisition distance, i.e. at a distance relative to this theoretical level of equal pinch or greater than the manufacturing thickness tolerance of the sheet metal; the speed is maintained at this acquisition speed of measurement over a displacement distance at least equal to double the measurement acquisition distance; the speed of displacement is then increased again up to speed folding. It is finally reduced and brought back to zero at approaching bottom dead center (or BDC, Bottom Dead Center).
- the system can perform a large number of measurement cycles of the physical parameter per unit of travel length and can therefore accurately detect the start of the variation of this parameter, as well as the precise position where the variation of the parameter exceeds a predetermined value, which means that the punch has come into contact with the sheet and is starting to pinch it.
- Control electronics determine actual thickness sheet metal while the deck descends at reduced speed of measurement acquisition and recalculates the parameters of the folding operation, in particular a correction of the neutral point low (BDC).
- BDC neutral point low
- the correction of the bottom dead center includes a correction level geometry due to the over- or under-thickness of the sheet metal.
- the thickness of the sheet is a parameter which largely determines the reaction force experienced by the press, in particular the uprights, during folding, and, consequently, the distortion of the press and the error of penetration of the resulting punch. From tests preliminary, we can establish an abacus or algorithm linking actual thickness and deformation of the press and correct the penetration error from the single measurement of the actual thickness.
- Two different parameters can be used to determine variations in sheet thickness and bending suffered by an amount.
- a physical parameter which is also representative of the geometric deformations of the press this same parameter allows both to correct the variations in sheet thickness, by detecting a initial variation ⁇ p of the parameter, and the deformation of the press, by measuring the maximum variation of the parameter in folding course.
- the force undergone by the amounts under the action of the means of moving the deck is determined during the folding operation by measuring the same parameter physical and compared with a diagram establishing the relation between force undergone by an amount and bending of said amount, and the slide stroke is also increased so that compensate for bending errors due to deformation of the press from this measurement, in addition to correcting errors due to variations in sheet thickness.
- the means of movement of the press brake include two hydraulic cylinders associated respectively with two amounts
- the value of the physical parameter can be measured at the level of each amount and the electronic control can independently correct the stroke each cylinder to its bottom dead center, or recalculate a common correction value from these two measurement zones.
- the physical parameter chosen can be the pressure hydraulic prevailing in the upper part of a cylinder.
- the physical parameter can also be the constraint mechanical that a cylinder exerts on the movable deck.
- the physical parameter can also be the distance between a point in the upper part and a point in the part low of the press frame.
- the physical parameter can also be a constraint mechanical that undergoes part of the press frame.
- the press brake shown in Figure 2 has a movable deck 1 supporting a punch 2 and a fixed deck 3 supporting a matrix 4.
- the movement of the movable deck is carried out using two hydraulic cylinders 5, 5 ', mounted on two respective uprights 6, 6 ′ integral with the deck inferior.
- Two measurement rules 9 and 9 ', mounted on the movable deck 1, measure the displacement of the movable deck relative to the respective uprights 6 and 6 '.
- the folding movement is controlled by a device control electronics 7.
- Two pressure sensors 8 and 8 ' are mounted respectively on each of the cylinders so as to detect the pressure at the top of each of them.
- the electronic control device is arranged to process the signals a1 and a2 respectively from each pressure sensors and also process two signals b1 and b2 from the 9 and 9 'measurement rules and representative displacements of the movable deck relative to each of the uprights 6 and 6 '.
- the diagram in Figure 3 illustrates the process according to the invention. It shows the speed of descent v of the deck mobile and at the same time shows the variation in pressure hydraulic p measured at a pressure sensor 8 or 8 '.
- the descent is carried out initially at a speed high approach v1 until reaching a distance predetermined from the level where the punch comes from theoretically pinch the sheet, called safety distance ds.
- the speed is decreased to a speed of folding vp, imposed by the composition and nominal thickness sheet metal as well as the characteristics of the bending desired, bending angle and tool profile. This speed can typically be of the order of 10mm / s.
- the tolerance on the thickness by ⁇ e the real thickness of the sheet will be included in the range e ⁇ ⁇ e.
- dam measurement acquisition distance
- vam speed acquisition of measurement
- the pressure sensors 8 and 8 ' measure the hydraulic pressure p at each of the cylinders 5 and 5 'and the control device 7 records it and Trafficking.
- the pressure variation is shown (in arbitrary units) on the diagram in Figure 3.
- the reduction of the speed v of descent, of the speed approach v1 at the folding speed vp, is accompanied by a slight concomitant pressure increase dpl.
- the value of the pressure reached then, during the descent phase at the bending speed and before coming into contact with the sheet, is considered as a reference value pr. of this parameter.
- a pressure measurement cycle of the sensor assembly + electronic control device lasts approximately 10 ms: from so while the deck goes down at a folding speed vp of the order of 10mm / s, a pressure measurement is performed every 0.1mm; when the descent speed is reduced to the measurement acquisition speed vam, a measurement pressure is applied every 0.01mm.
- the device is therefore able to determine very precisely the moment when the pressure p increases again by an amount ⁇ p, representative of the contact of the punch with the face top of the sheet. You can choose a value of ⁇ p from around 1 bar. This contact can occur at any point between the representative points of sheets of thickness e + ⁇ e and e- ⁇ e respectively.
- the comparison of entry level in contact with level theoretical pinch determines the difference between thickness real and nominal value of the sheet and the control device 7 immediately recalculates a bottom dead center.
- the pressure measured at the level of a sensor 8, 8 After contact, the pressure measured at the level of a sensor 8, 8 'increases according to an S curve up to reach pp value, bending pressure, often from around 300 bars, beyond which it varies little.
- the difference in value pp-pr determines the deformation of amounts and other parts of the press.
- the device control electronics 7 compare the value of pp or (pp-pr) with an algorithm specific to this press brake, stored in memory, establishing the relationship between this value and deformation of the fixed parts of the press, conditioning an error of penetration of the punch dy.
- the punch stroke can then be automatically corrected by consequence: the position of the bottom dead center of the slide (BDC) is thus increased by the value dy at the level of each upright, so as to create an independent folding movement of the press.
- the descent of the apron mobile can be continued at the folding speed, the value de dy which can be calculated and used for a correction of BDC while folding takes place at speed vp.
- the descent speed of the apron re-accelerates from the vam value to the vp value after having traveled a distance 2 ⁇ e at speed vam.
- the distance on which the deck descends at vam speed can also be programmed to a slightly higher value, for example 2xdam.
- the acceleration could also be programmed to intervene as soon as the variation ⁇ p is detected.
- the variation of the speed between points ds and dam can be programmed differently.
- Hydraulic oil pressure at the top of the cylinders is a parameter representative of all the phenomena and easy to measure with known sensors. It presents plus the advantage of being able to be correlated with both the entry of the punch into contact with the sheet and with the maximum deformation of the press brake during operation In progress.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Control Of Presses (AREA)
Abstract
Description
- la contrainte mécanique qu'un vérin exerce sur le tablier mobile peut être mesurée à l'aide de jauges de contrainte. Cette contrainte présente un saut de valeur lorsque le poinçon entre en contact avec la tôle, qui se traduit par une variation mesurable de quelques mV, pour atteindre ensuite une valeur maximale, de l'ordre du Volt, qui peut être corrélée à la déformation de la presse.
- La distance entre un élément de la partie haute et un élément de la partie basse du cadre de la presse peut être mesurée par des capteurs électromécaniques, en soi connus, capables de détecter des variations de distance de l'ordre du um. Le début de la variation du signal électrique est représentatif de l'entrée en contact du poinçon avec la tôle.
- On peut également mesurer par jauges de contrainte, la contrainte mécanique que subit une partie du cadre, plutôt que de mesurer la contrainte mécanique entre vérins et tablier mobile.
Claims (10)
- Procédé de réglage de la course d'une presse-plieuse comportant un tablier mobile (1) supportant un poinçon (2), un tablier fixe (3) supportant une matrice (4), des moyens de déplacement (5,5') du tablier mobile par rapport au tablier fixe, les dits moyens de déplacement s'appuyant sur des montants (6,6') solidaires du tablier fixe, des règles de mesure (9,9') pour la mesure du déplacement du tablier mobile par rapport aux montants, au moins un capteur (8, 8') mesurant un paramètre physique (p) variant avec la force exercée par ledit poinçon sur une tôle placée sur ladite matrice, et un dispositif électronique de commande (7) du pliage commandant la vitesse du mouvement de déplacement entre un point mort haut et un point mort bas (BDC), pourvu d'un moyen de calcul pour corriger la valeur du dit point mort bas en fonction de la mesure du dit déplacement et du dit paramètre physique, caractérisé en ce que la différence d'épaisseur entre l'épaisseur réelle de la tôle et une valeur de consigne (e) de l'épaisseur de la tôle est mesurée en comparant la position réelle du dit déplacement à laquelle se produit une variation prédéterminée Δp du dit paramètre physique (p) avec la position théorique du dit déplacement où cette variation Δp devrait se produire, et que ledit dispositif électronique de commande (7) calcule une correction du point mort bas en tenant compte de ladite différence d'épaisseur.
- Procédé selon la revendication 1, caractérisé en ce que la vitesse du mouvement de déplacement est réduite à une vitesse d'acquisition de mesure (vam), inférieure à une vitesse de pliage (v1) prédéterminée, lorsque le poinçon est à une distance prédéterminée du niveau théorique de pincement de la tôle supérieure à la tolérance d'épaisseur Δe de fabrication due ladite tôle, et que la vitesse du mouvement de déplacement augmente jusqu'à ladite vitesse de pliage après détection de ladite variation prédéterminée Δp du dit paramètre physique (p).
- Procédé selon la revendication 1 ou la revendication 2, caractérisé en ce que ledit déplacement s'effectue à une vitesse d'approche (v1) depuis le point mort haut jusqu'à une distance de sécurité (ds) prédéterminée du poinçon (2) par rapport au niveau théorique de pincement, où la vitesse est réduite à une vitesse de pliage (vp), que la vitesse est à nouveau réduite à une vitesse d'acquisition de mesure (vam), à une distance d'acquisition de mesure (dam) du poinçon par rapport au dit niveau théorique de pincement égale ou supérieure à la tolérance d'épaisseur Δe de la fabrication de ladite tôle et maintenue à ladite vitesse d'acquisition de mesure (vam) sur une distance sensiblement égale au moins au double de ladite distance d'acquisition de mesure (dam), et que la vitesse est ensuite augmentée à nouveau jusqu'à ladite vitesse de pliage (vp).
- Procédé selon la revendication 3, caractérisé en ce que ladite vitesse d'acquisition de mesure (vam) est d'environ 1/10 de la vitesse de pliage (vp).
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit paramètre physique est choisi parmi les paramètres représentatifs d'une déformation géométrique de la presse.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le dispositif électronique de commande (7) compare les valeurs mesurées du dit paramètre physique (p) avec un algorithme prédéterminé établissant la relation entre ledit paramètre physique et la déformation des parties fixes de la presse et corrige le point mort bas en tenant compte de ladite déformation.
- Procédé selon l'une quelconque des revendications 1 à 6 d'une presse-plieuse dont les moyens de déplacement comportent deux vérins hydrauliques associés respectivement à deux montants, caractérisé en ce que ledit paramètre physique est la pression hydraulique mesurée à la partie supérieure d'un vérin.
- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit paramètre physique est la contrainte mécanique qu'un vérin exerce sur le tablier mobile mesuré à ce niveau par une jauge de contrainte.
- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit paramètre physique est une contrainte mécanique que subit une partie du cadre de la presse mesurée au niveau de ladite partie à l'aide d'une jauge de contrainte.
- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit paramètre physique est la distance entre un point de la partie haute et un point de la partie basse du cadre de la presse.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE60019544T DE60019544T2 (de) | 2000-01-24 | 2000-01-24 | Verfahren zum Steuern des Hubes einer Biegepresse |
| AT00810058T ATE293500T1 (de) | 2000-01-24 | 2000-01-24 | Verfahren zum steuern des hubes einer biegepresse |
| ES00810058T ES2241566T3 (es) | 2000-01-24 | 2000-01-24 | Procedimiento de regulacion de la carrera de una prensa plegadora. |
| EP00810058A EP1120176B1 (fr) | 2000-01-24 | 2000-01-24 | Procédé de réglage de la course d'une presse-plieuse |
| DK00810058T DK1120176T3 (da) | 2000-01-24 | 2000-01-24 | Fremgangsmåde til regulering af en kantpresses slag |
| US09/768,713 US6581427B2 (en) | 2000-01-24 | 2001-01-24 | Method of adjusting the stroke of a press brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00810058A EP1120176B1 (fr) | 2000-01-24 | 2000-01-24 | Procédé de réglage de la course d'une presse-plieuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1120176A1 true EP1120176A1 (fr) | 2001-08-01 |
| EP1120176B1 EP1120176B1 (fr) | 2005-04-20 |
Family
ID=8174531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00810058A Expired - Lifetime EP1120176B1 (fr) | 2000-01-24 | 2000-01-24 | Procédé de réglage de la course d'une presse-plieuse |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6581427B2 (fr) |
| EP (1) | EP1120176B1 (fr) |
| AT (1) | ATE293500T1 (fr) |
| DE (1) | DE60019544T2 (fr) |
| DK (1) | DK1120176T3 (fr) |
| ES (1) | ES2241566T3 (fr) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW536432B (en) * | 2000-01-17 | 2003-06-11 | Amada Co Ltd | Method and system for processing a sheet member, and various devices relating to such system |
| US6826939B2 (en) * | 2000-02-18 | 2004-12-07 | Amada Company, Ltd. | Method and device for detaching plate thickness in press |
| US6959573B2 (en) | 2000-08-11 | 2005-11-01 | Amada Company, Limited | Bending method and device therefore |
| AT411164B (de) * | 2000-08-16 | 2003-10-27 | Trumpf Maschinen Austria Gmbh | Verfahren zum betrieb einer biegepresse und biegepresse, insbesondere abkantpresse |
| EP1401593B1 (fr) | 2001-03-16 | 2005-06-08 | Bystronic Laser AG | Procede de reglage de la course d'une presse-plieuse |
| JP3085272U (ja) * | 2001-10-10 | 2002-04-26 | 株式会社サルバニーニジャパン | プログラムされたシート曲げ用の短縮した段取り時間をもつ高性能機械 |
| FR2847835B1 (fr) * | 2002-11-29 | 2005-09-09 | Rbh | Dispositif de correction automatique des parametres de pliage inherents a la tole, sur une presse-plieuse |
| EP1452302B1 (fr) * | 2003-02-26 | 2009-04-08 | Bystronic Laser AG | Procédé de correction d'une opération de pliage et presse-plieuse |
| DE102005012384A1 (de) * | 2005-03-17 | 2006-07-13 | Siemens Ag | Verfahren zum Freibiegen |
| US8108176B2 (en) | 2006-06-29 | 2012-01-31 | Cognex Corporation | Method and apparatus for verifying two dimensional mark quality |
| CN103995927B (zh) * | 2006-08-31 | 2017-01-04 | 新日铁住金株式会社 | 回弹对策位置特定方法以及回弹对策位置特定装置 |
| GB201114438D0 (en) * | 2011-08-22 | 2011-10-05 | Airbus Operations Ltd | A method of manufacturing an elongate component |
| CN105327982A (zh) * | 2015-10-23 | 2016-02-17 | 南通太和机械集团有限公司 | 带下补偿机构的数控液压板料折弯机 |
| EP4140611A1 (fr) * | 2021-08-23 | 2023-03-01 | Bystronic Laser AG | Machine à plier, en particulier presse plieuse, pourvue de système de mesure de distance |
| CN115069882B (zh) * | 2022-08-22 | 2022-11-04 | 潍坊潍尔达石油机械有限公司 | 钢管冲压成型设备 |
| CN117619988A (zh) * | 2023-12-27 | 2024-03-01 | 无锡锡南科技股份有限公司 | 冲切模具及冲切设备行程的调试方法 |
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2000
- 2000-01-24 ES ES00810058T patent/ES2241566T3/es not_active Expired - Lifetime
- 2000-01-24 AT AT00810058T patent/ATE293500T1/de active
- 2000-01-24 DK DK00810058T patent/DK1120176T3/da active
- 2000-01-24 DE DE60019544T patent/DE60019544T2/de not_active Expired - Lifetime
- 2000-01-24 EP EP00810058A patent/EP1120176B1/fr not_active Expired - Lifetime
-
2001
- 2001-01-24 US US09/768,713 patent/US6581427B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550586A (en) * | 1982-11-05 | 1985-11-05 | Cybelec S.A. | Device for forming part of a press brake for determining automatically the thickness of the sheet |
| JPH0230327A (ja) * | 1988-07-15 | 1990-01-31 | Matsushita Electric Works Ltd | プレスブレーキのストローク制御装置 |
| CH686119A5 (fr) * | 1991-10-31 | 1996-01-15 | Beyeler Raskin Sa | Procede de reglage de la course du coulisseau d'une presse-plieuse et presse-plieuse comportant un dispositif de reglage pour la mise en oeuvre du procede. |
| JPH05138254A (ja) * | 1991-11-20 | 1993-06-01 | Amada Co Ltd | ベンダーにおける板厚測定方法及び測定装置 |
| JPH09136116A (ja) * | 1995-11-10 | 1997-05-27 | Amada Co Ltd | 曲げ加工機における板厚検出方法およびその装置並びに曲げ加工方法および曲げ加工機 |
| JPH1052800A (ja) * | 1996-08-08 | 1998-02-24 | Daikin Ind Ltd | プレス加工機の制御装置 |
Non-Patent Citations (4)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 014, no. 177 (M - 0960) 9 April 1990 (1990-04-09) * |
| PATENT ABSTRACTS OF JAPAN vol. 017, no. 520 (M - 1482) 20 September 1993 (1993-09-20) * |
| PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09 30 September 1997 (1997-09-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30) * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6581427B2 (en) | 2003-06-24 |
| DE60019544T2 (de) | 2006-02-23 |
| EP1120176B1 (fr) | 2005-04-20 |
| DK1120176T3 (da) | 2005-08-15 |
| ATE293500T1 (de) | 2005-05-15 |
| DE60019544D1 (de) | 2005-05-25 |
| ES2241566T3 (es) | 2005-11-01 |
| US20010009106A1 (en) | 2001-07-26 |
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