EP1120176B1 - Verfahren zum Steuern des Hubes einer Biegepresse - Google Patents

Verfahren zum Steuern des Hubes einer Biegepresse Download PDF

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Publication number
EP1120176B1
EP1120176B1 EP00810058A EP00810058A EP1120176B1 EP 1120176 B1 EP1120176 B1 EP 1120176B1 EP 00810058 A EP00810058 A EP 00810058A EP 00810058 A EP00810058 A EP 00810058A EP 1120176 B1 EP1120176 B1 EP 1120176B1
Authority
EP
European Patent Office
Prior art keywords
speed
physical parameter
displacement
thickness
movable beam
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
EP00810058A
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English (en)
French (fr)
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EP1120176A1 (de
Inventor
Gerritsen Gerrit
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.)
Bystronic Laser AG
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Bystronic Laser AG
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 Bystronic Laser AG filed Critical Bystronic Laser AG
Priority to EP00810058A priority Critical patent/EP1120176B1/de
Priority to AT00810058T priority patent/ATE293500T1/de
Priority to DE60019544T priority patent/DE60019544T2/de
Priority to DK00810058T priority patent/DK1120176T3/da
Priority to ES00810058T priority patent/ES2241566T3/es
Priority to US09/768,713 priority patent/US6581427B2/en
Publication of EP1120176A1 publication Critical patent/EP1120176A1/de
Application granted granted Critical
Publication of EP1120176B1 publication Critical patent/EP1120176B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D5/02—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 running of a press brake with a movable apron supporting a punch, a fixed apron supporting a matrix, means for moving the movable deck relative to the fixed apron, the said means of displacement relying on solidarity amounts of the fixed deck, measurement rules for measuring the movement of the moving deck relative to at the uprights, at least one sensor measuring a parameter varying with the force exerted by said punch on a sheet placed on said die and a device electronic control of the folding movement controlling the speed of said movement movement between a dead point high and a low dead point and provided with a means of calculation for correct the value of the said bottom dead point according to the measuring said displacement and said physical parameter.
  • Applicant's patent CH 686119 describes a press brake of that type.
  • the force experienced by the amounts of a press under the effect of the thrust of the cylinders causes a bending of the amounts, which can result in a deformation of the frame up to 1-2mm.
  • This flexion modifies the penetration depth of the punch in the matrix, this which creates an error of the angle of folding obtained on the piece to to fold.
  • control method determines, for example using pressure sensors, the force suffered by each of the amounts under the action of the means of moving the movable deck and comparing each of the values obtained with a predetermined diagram establishing the relationship between the force suffered by the respective amount and the bending of the amount, and increasing the stroke of the slider to compensate for bending errors due to deformations of the press, particularly due to bending amounts.
  • the nominal thickness of the sheet is one of the parameters introduced into the control electronics of the press brake during the initial adjustment of the race.
  • the actual thickness of the sheet must be measured in principle each time by the operator. Indeed, sheet steel manufacturers supply sheet metal the actual thickness has variations that can go up to 10% of the nominal value of the thickness. If a sheet nominal thickness of 2mm should for example be bent at 90 ° in a V-shaped opening of 12mm, a variation of the 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 is going to treat and introduce this data into the control electronics of the press brake so that it corrects the race of the slide.
  • the object of the present invention is to propose a method of adjusting the stroke of a press brake holding account for variations in the actual thickness of the sheets processed without the need for operator intervention.
  • the invention proposes a method such that defined in claim 1, wherein the difference between the thickness actual 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 real position of displacement, 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 displacement where this predetermined variation should be produce, and in which the electronic device of command calculates a correction of the bottom dead center by holding account of this difference in thickness.
  • the speed of the displacement movement is reduced to a measurement acquisition speed (vam), less than a predetermined folding speed (vl), when the punch is at a predetermined distance from the level theoretical pinching of the sheet superior to the tolerance of thickness ⁇ e of manufacture of said sheet, and the speed of movement movement increases up to said speed of folding after detection of said predetermined variation ⁇ p of said physical parameter (p).
  • the movement of the moving deck takes place at approach speed from the top dead center to a safe distance predetermined with respect to the theoretical pinch level, that is to say, the level reached by the apron during its descent, where the sheet starts to be pinched between punch and matrix, distance where the speed is reduced to a speed of folding; the speed of movement of the apron is again reduced to a measurement acquisition speed, to a measurement acquisition distance, that is to say at a distance relative to this theoretical level of equal pinch or greater than the manufacturing thickness tolerance of the sheet; the speed is maintained at this acquisition speed measuring distance over a distance of at least double the measurement acquisition distance; the speed of displacement is then increased again up to the speed folding. It is finally reduced and reduced to zero at the approach of the bottom dead center (or BDC, Bottom Dead Center).
  • the system can perform a large number of measurement cycles of the physical parameter per unit length of travel and can accurately detect the beginning of the variation of this parameter, as well as the precise position where the variation parameter exceeds a predetermined value, which means that the punch came into contact with the sheet and starts to pinch it.
  • the control electronics determine the actual thickness of the sheet while the deck goes down at a reduced speed of measurement acquisition and recalculates the parameters of the folding operation, in particular a dead center correction low (BDC).
  • BDC dead center correction low
  • the correction of the bottom dead center includes a correction geometric level due to the over- or under-thickness of the sheet.
  • the thickness of the sheet is a parameter that to a large extent determines the reaction force experienced by the press, including the amounts, when folding, and hence the deformation of the press and the error of punch penetration that results. 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 only measure of the actual thickness.
  • Two different parameters can be used to determine variations in sheet thickness and flexion suffered by an amount.
  • this same parameter allows both to correct the variations in sheet thickness, by the detection of 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 suffered by the amounts under the action of the apron moving means is determined during the folding operation by measuring the same parameter physical and compared with a diagram establishing the relationship between force undergone by an amount and bending of said amount, and the stroke of the slider is also increased so as to compensate for bending errors due to deformation of the press from this measure, in addition to the correction of errors due to variations in thickness of the sheet.
  • the means of movement of the press brake include two hydraulic cylinders respectively associated 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 race each cylinder to its bottom dead center, or recalculate a common correction value from these two measurement zones.
  • the physical parameter chosen may be the pressure hydraulic valve in the upper part of a cylinder.
  • the physical parameter can also be the constraint mechanics that a cylinder exerts on the moving deck.
  • the physical parameter can also be the distance between a point of the high part and a point of the part lower part of the press.
  • the physical parameter can also be a constraint mechanical that undergoes part of the frame of the press.
  • the press brake shown in FIG. movable apron 1 supporting a punch 2 and a fixed apron 3 supporting a matrix 4.
  • Moving the moving deck is carried out using two hydraulic cylinders 5, 5 ', mounted on two respective uprights 6, 6 'integral with the apron inferior.
  • Two measuring rules 9 and 9 ', mounted on the movable apron 1 make it possible to measure the displacement of the apron movable relative to the respective amounts 6 and 6 '.
  • the folding movement is controlled by a device electronic control 7.
  • Two pressure sensors 8 and 8 ' are respectively mounted on each of the cylinders so as to detect the pressure at the top of each one.
  • the electronic control device is arranged so as to process the signals a1 and a2 respectively from each pressure sensors and also process two signals b1 and b2 from measurement rules 9 and 9 'and representative displacements of the movable deck with respect to each of the amounts 6 and 6 '.
  • the diagram in Figure 3 illustrates the process according to the invention. It shows the speed of descent v of the apron mobile and shows at the same time the variation of the pressure hydraulic p measured at a pressure sensor 8 or 8 '.
  • the descent is done first at a speed high approach v1 until reaching a distance predetermined in relation to the level where the punch comes theoretically pinch the sheet, said safety distance ds.
  • the speed is decreased to a speed of vp folding, imposed by the composition and the nominal thickness of sheet metal as well as by the characteristics of the folding 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 actual thickness of the sheet will be in the range e ⁇ ⁇ e.
  • dam measurement acquisition distance
  • vam speed of acquisition of measurement
  • the pressure sensors 8 and 8 ' measure the hydraulic pressure p at each of the jacks 5 and 5 'and the control device 7 records it and Trafficking.
  • the variation of the pressure is represented (in arbitrary units) on the diagram in Figure 3.
  • the reduction of speed v of descent, speed approach v1 at the bending speed vp, is accompanied by a slight concomitant pressure increase dpl.
  • the value of the pressure then reached, during the descent phase to the bending speed and before coming into contact with the sheet, is considered as reference value pr. of this parameter.
  • a pressure measurement cycle of the sensor + electronic control device lasts about 10 ms: from the so, while the apron goes down at a bending speed vp of the order of 10mm / s, a measure of the pressure is performed every 0.1mm; when the descent speed is reduced to the measurement acquisition speed vam, a measure pressure is performed every 0.01mm.
  • the device is therefore able to determine in a very precise way the when the pressure p increases again by an amount ⁇ p, representative of the contacting of the punch with the face top of the sheet.
  • ⁇ p representative of the contacting of the punch with the face top of the sheet.
  • the comparison of the entry level in contact with the level theoretical pinch determines the difference between thickness actual and nominal of the sheet and the control device 7 immediately recalculate a bottom dead center.
  • the device electronic control 7 compares the value of pp or (pp-pr) with an algorithm specific to this press brake, recorded in memory, establishing the relationship between that value and deformation of the fixed parts of the press, conditioning a penetration error punch dy.
  • the punch stroke can then be automatically corrected in consequence: the position of the bottom dead center of the slide (BDC) is thus increased by the value dy at the level of each amount, so as to create an independent folding movement of the press load.
  • the descent of the apron mobile can be continued at the folding speed, the value of dy that can be calculated and used for a correction of BDC while folding is performed at the speed vp.
  • the speed of descent of the deck re-accelerates the value vam to the value vp after have traveled a distance 2 ⁇ e at speed vam.
  • the distance on which the deck goes down at speed vam can also be programmed to a slightly higher value, for example 2xdam. Acceleration could also be programmed to intervene as soon as the variation ⁇ p is detected.
  • the variation of the speed between the points ds and dam can be programmed differently.
  • the hydraulic pressure of the oil at the top of the cylinders is a parameter representative of all the phenomena and easy to measure with sensors known per se. It presents plus the advantage of being able to correlate with both the contacting of the punch with the sheet and with the maximum deformation of the press brake during the operation In progress.
  • the variations of the chosen physical parameter can be measured at a single point in the press. If they are measured in two different places, for example at the level of two lateral amounts, measured values and corrections of low dead point that they determine can be applied independently at the level of the two amounts or averaged for apply a global correction.

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

Claims (9)

  1. Verfahren zur Steuerung des Weges einer Biegepresse, die mit einem beweglichen Gestell (1), das einen Stempel (2) trägt, einem feststehenden Gestell (3), das eine Matrize (4) trägt, einer Anordnung (5,5')zur Verschiebung des beweglichen Gestells relativ zum feststehenden Gestell, wobei diese Anordnung zur Verschiebung sich auf Trägern (6,6') abstützt, die fest mit dem feststehenden Gestell verbunden sind, Messleisten (9,9') zur Feststellung der Verschiebung des beweglichen Gestells relativ zu den Trägern, mindestens einem Fühler (8,8') zur Messung eines physikalischen Parameters (p), der sich mit der Kraft ändert, die vom Stempel auf ein auf die Matrize aufgelegtes Blech ausgeübt wird und einer elektronischen Steuervorrichtung (7) für den Biegevorgang versehen ist, die die Geschwindigkeit der Verschiebebewegung zwischen einem oberen Totpunkt und einem unteren Totpunkt (BDC) steuert und die eine Rechenanordnung aufweist um den Wert des unteren Totpunktes zu korrigieren als Funktion der Messung der Verschiebung und des physikalischen Parameters, dadurch gekennzeichnet, dass die Dickendifferenz zwischen der tatsächlichen Dicke des Blechs und einem Sollwert (e) für die Dicke des Blechs gemessen wird durch einen Vergleich der tatsächlichen Position der Verschiebung, an der eine vorgegebene Variation (Δp) des physikalischen Parameters (p) auftritt mit der theoretischen Position der Verschiebung, an der die Variation Δp auftreten sollte, dass die elektronische Steuervorrichtung (7) eine Korrektur des unteren Totpunktes berechnet unter Berücksichtigung der Dickendifferenz, dass die Geschwindigkeit der Verschiebebewegung reduziert wird auf eine Geschwindigkeit (vam) der Messwertwerterfassung, die kleiner ist als eine vorgegebene Biegegeschwindigkeit (v1), wenn der Stempel einen vorgegebenen Abstand aufweist von der theoretischen Höhe der Beaufschlagung des Blechs, der grösser ist als die durch die Herstellung bedingte Dickentoleranz Δe, dass eine Vielzahl von Messzyklen für den physikalischen Parameter (p) durchgeführt wird während das bewegliche Gestell sich mit der Geschwindigkeit (vam) der Messwerterfassung verschiebt, um eine Vielzahl von Messwerten des physikalischen Parameters (p) pro Längeneinheit der Verschiebung zu erfassen, und dass die Geschwindigkeit der Verschiebebewegung zunimmt bis zur Biegegeschwindigkeit nach Feststellung der vorgegebenen Variation (Δp) des physikalischen Parameters (p).
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Verschiebung vom oberen Totpunkt aus mit einer Annäherungsgeschwindigkeit (v1) bis zu einem vorgegebenen Sicherheitsabstand (ds) des Stempels (2) von der theoretischen Höhe der Beaufschlagung erfolgt, ab der die Geschwindigkeit auf die Biegegeschwindigkeit (vp) reduziert wird, dass die Geschwindigkeit erneut reduziert wird auf eine Geschwindigkeit (vam) der Messwerterfassung bei einem Abstand (dam) der Messwerterfassung des Stempels von der theoretischen Höhe der Beaufschlagung, der gleich oder grösser als die durch die Herstellung bedingte Dickentoleranz Δe des Blechs ist und auf dieser Geschwindigkeit (vam) der Messwerterfassung gehalten wird über einen Weg der im Wesentlichen mindestens gleich dem Doppelten des Abstands (dam) der Messwerterfassung ist und dass anschliessend die Geschwindigkeit erneut vergrössert wird bis zur Biegegeschwindigkeit (vp).
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Geschwindigkeit (vam) der Messwerterfassung ungefähr 1/10 der Biegegeschwindigkeit (vp) beträgt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der physikalische Parameter aus den Parametern ausgewählt wird, die für eine geometrische Verformung der Presse repräsentativ sind.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die elektronische Steuervorrichtung (7) die gemessenen Werte des physikalischen Parameters (p) mit einem vorgegebenen Algorithmus vergleicht, der das Verhältnis zwischen dem physikalischen Parameter und der Verformung der feststehenden Bauteile der Presse darstellt und den unteren Totpunkt unter Berücksichtigung dieser Verformung korrigiert.
  6. Verfahren nach einem der Ansprüche 1 bis 5 für eine Biegepresse, deren Verschiebeanordnung zwei hydraulische Druckzylinder aufweist, die zwei entsprechenden Trägern zugeordnet sind, dadurch gekennzeichnet, dass der physikalische Parameter der im oberen Abschnitt eines der Druckzylinder gemessene hydraulische Druck ist.
  7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der physikalische Parameter die von einem der Druckzylinder auf das bewegliche Gestell ausgeübte mechanische Belastung ist, gemessen auf dessen Höhe von einem Belastungsmesser.
  8. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der physikalische Parameter eine mechanische Belastung ist, der ein Teil des Rahmens der Presse ausgesetzt ist, gemessen auf Höhe dieses Teils von einem Belastungsmesser.
  9. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der physikalische Parameter der Abstand zwischen einer Stelle im oberen Teil und einer Stelle im unteren Teil des Rahmens der Presse ist.
EP00810058A 2000-01-24 2000-01-24 Verfahren zum Steuern des Hubes einer Biegepresse Expired - Lifetime EP1120176B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP00810058A EP1120176B1 (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
DE60019544T DE60019544T2 (de) 2000-01-24 2000-01-24 Verfahren zum Steuern des Hubes einer Biegepresse
DK00810058T DK1120176T3 (da) 2000-01-24 2000-01-24 Fremgangsmåde til regulering af en kantpresses slag
ES00810058T ES2241566T3 (es) 2000-01-24 2000-01-24 Procedimiento de regulacion de la carrera de una prensa plegadora.
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 (de) 2000-01-24 2000-01-24 Verfahren zum Steuern des Hubes einer Biegepresse

Publications (2)

Publication Number Publication Date
EP1120176A1 EP1120176A1 (de) 2001-08-01
EP1120176B1 true EP1120176B1 (de) 2005-04-20

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EP00810058A Expired - Lifetime EP1120176B1 (de) 2000-01-24 2000-01-24 Verfahren zum Steuern des Hubes einer Biegepresse

Country Status (6)

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US (1) US6581427B2 (de)
EP (1) EP1120176B1 (de)
AT (1) ATE293500T1 (de)
DE (1) DE60019544T2 (de)
DK (1) DK1120176T3 (de)
ES (1) ES2241566T3 (de)

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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

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Publication number Publication date
ES2241566T3 (es) 2005-11-01
DE60019544T2 (de) 2006-02-23
ATE293500T1 (de) 2005-05-15
DE60019544D1 (de) 2005-05-25
DK1120176T3 (da) 2005-08-15
EP1120176A1 (de) 2001-08-01
US20010009106A1 (en) 2001-07-26
US6581427B2 (en) 2003-06-24

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