EP0353479A1 - Procédé et dispositif pour réduire la charge de presse dans une presse à découper comportant des butées fixes - Google Patents

Procédé et dispositif pour réduire la charge de presse dans une presse à découper comportant des butées fixes Download PDF

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Publication number
EP0353479A1
EP0353479A1 EP89112232A EP89112232A EP0353479A1 EP 0353479 A1 EP0353479 A1 EP 0353479A1 EP 89112232 A EP89112232 A EP 89112232A EP 89112232 A EP89112232 A EP 89112232A EP 0353479 A1 EP0353479 A1 EP 0353479A1
Authority
EP
European Patent Office
Prior art keywords
ram
impact force
fixed stop
height
press
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
EP89112232A
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German (de)
English (en)
Other versions
EP0353479B1 (fr
Inventor
Peter Rüesch
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.)
Bruderer AG
Original Assignee
Bruderer 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4243428&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0353479(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bruderer AG filed Critical Bruderer AG
Publication of EP0353479A1 publication Critical patent/EP0353479A1/fr
Application granted granted Critical
Publication of EP0353479B1 publication Critical patent/EP0353479B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0035—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height using an adjustable connection between the press drive means and the press slide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0041—Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • 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
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y10T83/148—Including means to correct the sensed operation
    • 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
    • Y10T83/00—Cutting
    • Y10T83/162—With control means responsive to replaceable or selectable information program
    • Y10T83/173—Arithmetically determined program
    • Y10T83/175—With condition sensor
    • 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
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8696—Means to change datum plane of tool or tool presser stroke
    • Y10T83/87—By varying length of tool stroke

Definitions

  • the present invention relates to a method for reducing the press load on a cutting press, in which a relative position between the upper and lower tool is limited by at least one fixed stop. It further relates to a device for carrying out the method according to claim 1, wherein the cutting press has at least one fixed stop used in the upper and / or lower tool part and is equipped with a control device containing an actuator for changing the ram height during operation.
  • the height of the ram must be given special attention. For example, a very precise bottom dead center position of the ram is required in the entire operating stroke range if very precise bends, embossing, cutting open tear-open covers, etc. is required. If the dead center is inaccurate, scrap is produced.
  • fixed stops are generally provided on the lower and upper tool parts. These fixed stops keep the relative end position of the upper and lower parts of the tool constant over the entire stroke rate range of a given cutting press. however, the minimum collision forces required with a small number of strokes increase sharply with an increasing number of strokes and therefore put additional strain on the cutting press.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, achieves the object of providing a method and a device for carrying out the same, in which the force exerted on the mechanical impact is measured and the height position of the ram is changed as a function of the measured impact force, that it stays within a specified range.
  • the cutting press is generally designated by the reference number 1.
  • the plunger 2 is also shown, which is articulated via pivot pins 14 to crank arms 16, which in turn are drive-connected to a crankshaft, eccentric shaft or other type of drive, not shown.
  • crank arms 16 which in turn are drive-connected to a crankshaft, eccentric shaft or other type of drive, not shown.
  • these components are only to be regarded as an example of the drive of the plunger 2.
  • An upper tool part 3 is connected to the plunger 2, which upper tool part 3 interacts with a lower tool part 4, for example with cutting plates.
  • the height of the ram can be adjusted during operation of the high-speed cutting press, for which purpose there is a schematically represented servomotor 9, which acts on the ram 2 via a gear train 10.
  • the position indicator of the ram height adjustment is indicated by reference number 11.
  • Cutting punches 8 are inserted in the upper part 3 of the tool.
  • two fixed stops 5 are arranged in the upper part 3 of the tool.
  • the lower part 4 there are also two Fixed stops 6 shown. It should be noted here that this representation is purely for example. Basically, only a fixed stop in one of the two tool parts, in particular in the lower tool part 4, is necessary. There can be more than two fixed stops per tool part or, in the case of follow-up cutting tools, only one work station can be provided with at least one fixed stop.
  • These fixed stops can be, for example, a steel block, a steel cylinder, etc. Due to the fact that the lifting movement of the upper tool part 3 in the lower dead center area relative to the lower tool part 4 is limited by at least one fixed stop, there is certainly no or only the minimally required immersion of the upper tool part 3 in the lower tool part 4 with associated wear, so that the immersion depth 0 or the desired size.
  • This immersion depth e.g. when embossing, also accept negative values, i.e. the cutting punch then does not reach the die.
  • a certain immersion depth can be made possible by appropriate selection of the height of the fixed stops, depending on the prevailing conditions with regard to the tools.
  • At least one fixed stop with one or more sensors in the embodiment shown it is the two fixed stops 6 in the lower tool part 4, equipped with a sensor.
  • the impact of the upper part 3 of the tool on a respective fixed stop 6 causes the latter to move in the direction of the ram hubs deformed elastically, since a collision force is exerted on them.
  • this elastic deformation is extremely small, but can still be detected with a suitable component.
  • a strain gauge which is connected in a known manner via a Wheatstone bridge, can be arranged on the respective fixed stop, or a piezo element could be present.
  • FIG. 2 The plunger 2, a fixed stop 5 in the upper tool part 3 and a fixed stop 6 in the lower tool part 4 are shown in this. A number of cutting punches 8 are also shown.
  • the fixed stop 6 is now equipped with a component 15 as described above, which, depending on the respective collision force, emits an electrical signal by registering the elastic deformation of the fixed stop 6.
  • This signal is fed to a signal amplifier 12 and the output of this signal amplifier 12 is fed to a control part 13 for adjusting the ram height.
  • the control part 13 is connected to the servomotor 9 for adjusting the ram height and to the position transmitter 11 for adjusting the ram height.
  • the servomotor 9 drives the gear train 10 for the ram height adjustment.
  • the units 9-11 and 13 are of a known type, as is also the case with the signal amplifier 12, and a detailed description of these devices is therefore unnecessary.
  • the corresponding signal lies below a predetermined limit, which state is determined in the control part 13, and which, in accordance with the servomotor 9 for the ram height adjustment, transmits a signal which causes the height of the ram to be changed until the collision force specified for the correct operation occurs.
  • the servomotor 9 is controlled in such a way that the height of the plunger is increased until a predetermined drive-up force prevails and the press is thus relieved.
  • This control of the height of the ram is used in particular at different speeds or strokes in high-speed cutting presses, e.g. when starting up or changing the number of strokes in normal operation.
  • the immersion depth of an upper tool takes on uncontrolled cutting presses an associated lower tool with increasing working speed, ie higher number of strokes.
  • the fixed stops ensure that the immersion depth is absolutely limited, or even 0 if necessary.
  • the height of the ram can now be controlled in operation, depending on the prevailing conditions, the basis of the control not being based on a measurement, for example the speed, but on the actually occurring collision force.
  • the collision force is determined directly on the part affected, namely the fixed stop, whereby an elastic deformation is sensed. No measurement is therefore carried out at a point distant from the point of impact with the fixed stop, which measurement becomes inaccurate due to deformations of machine parts and changes in bearings during operation.
  • the load on the fixed stops ie the collision force that occurs on them
  • a selectable basic correction can be set with respect to the ram height, as a function of the number of strokes, when retracting a newly equipped machine, and after engagement, control can then be carried out, depending on the predetermined collision force, in accordance with that of the sensor or sensors , delivered values, can be switched.
  • the tappet height correction which is dependent on the number of strokes, in the control part 13, the values supplied by the sensors then overriding the previously set values.
  • the control of the height of the ram also comes into play when the temperature changes, for example when the cold press starts up and when the ambient temperature changes.
  • the speed (number of strokes) of each cut press is marked with "n", and the press load generally with "F".
  • a punch press is generally designed for a nominal pressing force F N. This design therefore determines the size of the machine and thus crucially the purchase price for the user of a particular machine.
  • the cutting force or embossing force is designated F St. This is the force generated in the tool and to be applied by the cutting press for a particular work step, eg punching, embossing, bending, etc., in accordance with the product to be manufactured.
  • the impact force on the fixed stop, or the fixed stops, which is also to be absorbed by the cutting press is designated F A.
  • the sum F St + F A thus determines the force to be exerted by the cutting press (apart from the internal losses of the machine resulting from, for example, bearing friction), that is to say determines the design or size, and thus ultimately the costs thereof.
  • a number of strokes n1 is now assumed, purely for example 100 strokes per minute.
  • the press load F is therefore composed of F St + F A. It is assumed that a tool with fixed stops is available. It should also be assumed that the ram height remains the same, i.e. there are no precautions to change the ram height (e.g. depending on the number of strokes or impact force), so that the force to be applied by the cutting press increases with an increasing number of strokes.
  • the press force F increases with increasing n according to the solid curve line.
  • the number of strokes n2 for example 1000 strokes per minute, is the maximum number of strokes of this cutting press.
  • the nominal pressing force F N of this cutting press i.e. the design size and ultimately the cost of the same.
  • the dashed curve line now gives the pressing force F to be used in the case of the invention Cutting press equipped with height adjustment. It should be noted in particular that the collision force on the fixed stop, or the fixed stops, is kept constant in the entire stroke rate range due to the ram height correction that is now taking place.
  • the dashed curve line runs below the solid line again up to the maximum number of strokes n2. This results in a decisive reduction in the press force to be exerted by the press, which reduction is marked with F R. If the cutting press is designed the same, the load on the cutting press is reduced by 20 to 30%! This means that in the case of fixed stops, combined with ram height adjustment, the cutting press to be purchased does not have to be designed for the same work output for F N , but for F N - F R. The result is a "smaller" machine, which leads to decisive cost savings when purchasing the same.
  • FIG. 4 in which all designations correspond to those in FIG. 3.
  • the diagram is based on a cutting press which is identical to that of FIG. 3 with the nominal pressing force F N , that is to say the press load without ram height correction increases with an increasing number of strokes along the solid curve line (FIG. 3).
  • the ram height correction and the stroke limitation by means of fixed stops are present.
  • the value F A that is the impact force on a respective fixed stop, is equal to that of FIG. 3 at the number of strokes n 1 and is kept constant as the number of strokes increases.
  • F St can now be correspondingly and noticeably larger. It means that With a given cutting press, which is equipped with fixed stops and ram height control, the available manpower is significantly greater. The difference can be up to 40%. And this obviously results in significant savings when purchasing a punch press, because the punch press equipped accordingly has a much higher workforce available for machining workpieces.
  • FIGS. 5-7 The course of the tappet path in the lower dead center area is shown schematically in these.
  • t means the passage of time and h the ram path.
  • the lowest ram position corresponds to point B, with the specific ram path being drawn without a fixed stop and without cutting or embossing as a dashed line. If there are fixed stops, the ram path (including cutting or embossing) follows the solid curve line, with the lowest ram position at A now. In particular, attention is drawn to the fact that the ram path at the lowest ram position is drawn as a straight line due to the fixed stop. There is no further downward movement. There is therefore a precisely defined lowest relative position with respect to the lower part of the tool through the fixed stops.
  • FIG. 6 shows the course of the ram path in the bottom dead center area during operation. Without fixed stops, without ram height control or correction and without cutting or embossing work, the ram path runs according to the dashed curve line, corresponding to the lowest ram position to reach the position of the letter B.
  • the ram path runs along the solid line with fixed stops and cutting or embossing work, with the lowest ram position at A.
  • the large difference ⁇ h from A to B indicates a high impact pressure on the fixed stops.
  • Figure 7 shows the same operating state of the cutting press as Figure 6.
  • the lowest ram position is again designated with A.
  • the duration of this lowest tappet position according to the horizontal distance at A is now considerably shorter than the tappet travel according to Figure 6.
  • the dashed line from which the bottom tappet position B can be seen represents the same without fixed stops, but with tappet height control.
  • the sensor or sensors can also form a structural unit separate from the relevant fixed stop and can be installed next to or directly under the fixed stop.
  • the fixed stop could also be designed in the form of a frame.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Punching Or Piercing (AREA)
EP89112232A 1988-07-28 1989-07-05 Procédé et dispositif pour réduire la charge de presse dans une presse à découper comportant des butées fixes Expired - Lifetime EP0353479B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2870/88A CH678159A5 (fr) 1988-07-28 1988-07-28
CH2870/88 1988-07-28

Publications (2)

Publication Number Publication Date
EP0353479A1 true EP0353479A1 (fr) 1990-02-07
EP0353479B1 EP0353479B1 (fr) 1992-12-09

Family

ID=4243428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112232A Expired - Lifetime EP0353479B1 (fr) 1988-07-28 1989-07-05 Procédé et dispositif pour réduire la charge de presse dans une presse à découper comportant des butées fixes

Country Status (5)

Country Link
US (1) US5090282A (fr)
EP (1) EP0353479B1 (fr)
JP (1) JP2832044B2 (fr)
CH (1) CH678159A5 (fr)
DE (1) DE58902951D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554501A1 (fr) * 1991-06-28 1993-08-11 Aida Engineering Ltd. Dispositif de correction de la position du point mort inférieur d'une presse
EP0569603A1 (fr) * 1991-12-03 1993-11-18 Ishii Tool & Engineering Corporation Procede permettant de commander automatiquement la force de pression d'une presse, et dispositif utilise a cet effet
WO2007043929A1 (fr) * 2005-10-07 2007-04-19 Sobi Hb Procede de decoupage a l'emporte-piece de materiau d'emballage, forme a poinçonner et machine de decoupage a l'emporte-piece comprenant des elements d'arret
WO2020015815A1 (fr) * 2018-07-16 2020-01-23 Bruderer Ag Procédé de fonctionnement d'une poinçonneuse et poinçonneuse pour le fonctionnement selon ce procédé

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5372291A (en) * 1992-09-29 1994-12-13 Electroimpact, Inc. Base assembly for automatic riveting machine
CN1064002C (zh) * 1992-12-03 2001-04-04 株式会社石井工作研究所 压力机床的加压力自动控制方法及其装置
JP2705591B2 (ja) * 1994-10-04 1998-01-28 村田機械株式会社 パンチ駆動制御装置
US6314852B1 (en) 1998-08-03 2001-11-13 International Business Machines Corporation Gang punch tool assembly
US6738729B1 (en) * 1999-10-19 2004-05-18 The Minster Machine Company Dynamic die penetration monitor
US20030126963A1 (en) * 2000-06-14 2003-07-10 Davis Denny E. Die cutter monitoring system
US20030121386A1 (en) * 2000-06-14 2003-07-03 Davis Denny E. Die cutter monitoring system
EP1177886B1 (fr) * 2000-08-01 2008-12-24 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
JP2002210695A (ja) * 2001-01-16 2002-07-30 Uht Corp パンチングユニット
DK179165B9 (en) 2016-12-01 2018-04-09 Elastisense Aps Press-working apparatus and related method
WO2021144012A1 (fr) 2020-01-15 2021-07-22 Bruderer Ag Procédé de fonctionnement d'une presse à estamper et presse à estamper pour le fonctionnement selon le procédé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE862091C (de) * 1943-07-25 1953-01-08 Mueller Fritz Stuetze fuer den Einbau in die Lichtweite von Pressen
US3333447A (en) * 1965-06-24 1967-08-01 Gen Motors Corp Safety stop block
DE1947985A1 (de) * 1968-11-04 1970-05-06 Lester Engineering Company Spritzgussmaschine od.dgl.
FR2396641A1 (fr) * 1977-07-09 1979-02-02 Schuler Gmbh L Mecanisme de positionnement pour un reglage de coulisseau d'une presse a decouper
US4480538A (en) * 1982-12-16 1984-11-06 Kabushiki Kaisha Yamada Dobby Means for correcting the position of bottom dead center in a press
DE3439459A1 (de) * 1983-12-29 1985-07-11 Fukui Machinery Co., Ltd., Fukui Vorrichtung zur automatischen korrektur der position eines schlittens in einer presse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2833829C2 (de) * 1978-08-02 1986-11-27 L. Schuler GmbH, 7320 Göppingen Schaltungsanordnung für einen Stellantrieb einer Stößelverstellung
JPH0249840B2 (ja) * 1981-09-17 1990-10-31 Komatsu Mfg Co Ltd Puresukinooobaawaakukenshutsuhoho
IT1156672B (it) * 1982-09-27 1987-02-04 Rainer Srl Macchina utensile per la lavorazione della lamiera
AU568883B2 (en) * 1983-10-31 1988-01-14 Hashimoto Forming Industry Co. Limited Press machine
US4875305A (en) * 1989-02-17 1989-10-24 Bridges John O Slowly dissolving fishing lure attachment with scent mixture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE862091C (de) * 1943-07-25 1953-01-08 Mueller Fritz Stuetze fuer den Einbau in die Lichtweite von Pressen
US3333447A (en) * 1965-06-24 1967-08-01 Gen Motors Corp Safety stop block
DE1947985A1 (de) * 1968-11-04 1970-05-06 Lester Engineering Company Spritzgussmaschine od.dgl.
FR2396641A1 (fr) * 1977-07-09 1979-02-02 Schuler Gmbh L Mecanisme de positionnement pour un reglage de coulisseau d'une presse a decouper
US4480538A (en) * 1982-12-16 1984-11-06 Kabushiki Kaisha Yamada Dobby Means for correcting the position of bottom dead center in a press
DE3439459A1 (de) * 1983-12-29 1985-07-11 Fukui Machinery Co., Ltd., Fukui Vorrichtung zur automatischen korrektur der position eines schlittens in einer presse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554501A1 (fr) * 1991-06-28 1993-08-11 Aida Engineering Ltd. Dispositif de correction de la position du point mort inférieur d'une presse
EP0569603A1 (fr) * 1991-12-03 1993-11-18 Ishii Tool & Engineering Corporation Procede permettant de commander automatiquement la force de pression d'une presse, et dispositif utilise a cet effet
EP0569603A4 (fr) * 1991-12-03 1994-02-02 Mitoshi Ishii
US5379688A (en) * 1991-12-03 1995-01-10 Ishii; Mitishi Method of and apparatus for automatically controlling pressing force of press machine
WO2007043929A1 (fr) * 2005-10-07 2007-04-19 Sobi Hb Procede de decoupage a l'emporte-piece de materiau d'emballage, forme a poinçonner et machine de decoupage a l'emporte-piece comprenant des elements d'arret
WO2020015815A1 (fr) * 2018-07-16 2020-01-23 Bruderer Ag Procédé de fonctionnement d'une poinçonneuse et poinçonneuse pour le fonctionnement selon ce procédé

Also Published As

Publication number Publication date
JPH0270400A (ja) 1990-03-09
DE58902951D1 (de) 1993-01-21
US5090282A (en) 1992-02-25
JP2832044B2 (ja) 1998-12-02
CH678159A5 (fr) 1991-08-15
EP0353479B1 (fr) 1992-12-09

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