EP0367035A1 - Presse ou poinçonneuse - Google Patents

Presse ou poinçonneuse Download PDF

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Publication number
EP0367035A1
EP0367035A1 EP89119435A EP89119435A EP0367035A1 EP 0367035 A1 EP0367035 A1 EP 0367035A1 EP 89119435 A EP89119435 A EP 89119435A EP 89119435 A EP89119435 A EP 89119435A EP 0367035 A1 EP0367035 A1 EP 0367035A1
Authority
EP
European Patent Office
Prior art keywords
press
pressure
tool half
tool
plunger
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
EP89119435A
Other languages
German (de)
English (en)
Other versions
EP0367035B1 (fr
Inventor
Gerhard Wochele
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.)
Otto Kaiser & Co KG GmbH
Original Assignee
Otto Kaiser & Co KG GmbH
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 Otto Kaiser & Co KG GmbH filed Critical Otto Kaiser & Co KG GmbH
Priority to AT89119435T priority Critical patent/ATE79801T1/de
Publication of EP0367035A1 publication Critical patent/EP0367035A1/fr
Application granted granted Critical
Publication of EP0367035B1 publication Critical patent/EP0367035B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B30B15/0094—Press load monitoring means
    • 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

Definitions

  • the invention relates to a press or punch with a plunger carrying an upper tool half, the depth of which can be adjusted, and a press table arranged below the plunger and carrying the associated lower tool half and with a control device having at least one measuring sensor arranged on the tool for adjusting the Immersion depth of the ram when the press or punch is in operation.
  • Adjusting the plunger depth during operation is desirable because the plunger depth changes with the heating of the press or punch and the tool. This change in plunger depth can have a negative impact on the quality of the machined workpieces.
  • a ram adjustment is known, which makes it possible with high-speed cutting presses that the depth of immersion of an upper tool in an associated lower tool also with increasing working speed, i.e. higher stroke rate, can be kept constant.
  • an inductive displacement transducer is arranged between the tools, with which the immersion depth is recorded directly and passed on to the control device. The ram height is readjusted by a setpoint / actual value comparison.
  • a disadvantage of the known press is that the ram adjustment does not take fluctuating material thicknesses into account, at least when using embossing tools. But even if the tool halves are regrinded after a certain amount of wear, the specified nominal value of the immersion depth is no longer correct, so that complex readjustments are necessary. Otherwise, the inductive displacement sensor sensitive to pollution, heating and external influences, which can lead to malfunctions.
  • the senor is designed as a pressure sensor and, opposite the underside of the upper tool half, is arranged on the upper side or, opposite the upper side of the press table, on the underside of the lower tool half.
  • the plunger depth is no longer controlled directly, but indirectly via the tool pressure.
  • the measuring sensor is expediently arranged on the upper side of the lower half of the tool, so that it interacts with the underside of the upper half of the tool.
  • the pressure acting on the pressure transducer when the two tool halves are moved together is a measure of the immersion depth of the cutting punch of the upper tool half in the die of the lower tool half. This pressure measurement, which only indirectly reflects the immersion depth, allows the tool load to be read off directly and the ram immersion depth to be increased for blunt tools.
  • the pressure transducer is significantly less susceptible to wear than the known contactless inductive displacement transducers and less sensitive to contamination, since there is no relative movement of two parts against one another, in which frictional forces could act.
  • the immersion depth of the embossing die of the upper tool half in the die of the lower tool half is not so important; it is rather the aim to always keep the surface of the workpiece looking the same.
  • the pressure sensor is now arranged on the underside of the lower half of the tool and interacts with the top of the press table, the pressure that the stamping die exerts on the material is measured. This pressure is a measure of the depth of penetration of the die into the material, which must be distinguished from the depth of immersion of the die into the die.
  • the invention is based on the finding that a constant work result can only be achieved by moving away from the displacement measurement and by using the pressure measurement, both for punched and embossed workpieces.
  • the pressure sensor is formed from a pressure-resilient base body, in which a piezo element connected to the control device is embedded and the end of which is facing the top or the bottom of the lower tool half is covered with a rigid pressure plate. Since the piezo element is embedded in the elastically resilient base body, the pressure received by the pressure plate when the two tool halves are moved together is passed on uniformly to the piezo element, so that this pressure sensor is particularly insusceptible to faults.
  • the pressure body from a plastic, preferably a polyformaldehyde.
  • the pressure plate can be made of metal, preferably the same material as the tool.
  • the pressure sensor is embedded in the lower half of the tool. Particularly good results can be achieved with punching tools if the pressure plate of the pressure transducer lies on the top of the lower half of the tool and is flush with the top of the lower half of the tool. As a result, the pressure plate of the pressure transducer is also ground to the same extent when regrinding the cutting punch, so that regrinding the tools has no influence on the measurements.
  • the pressure transducer which is preferably provided for punching tools, the two tool halves are moved together during punching, the pressure between the two tool halves being measured directly, and not via the cutting punch, the material and the die. This means that with a thicker material where the cutting pressure is higher, a lower pressure is initially measured between the two tool halves, so that the material thickness during punching has no effect on the depth of the plunger and thus the work result.
  • the base body of the pressure transducer can also be conveniently embedded in the press table.
  • the pressure plate of the pressure sensor is then on the underside of the lower half of the tool. In this way, the pressure exerted by the stamp on the material and thus on the lower half of the tool is recorded. Even with different material thicknesses, this arrangement of the pressure sensor always ensures that the depth of penetration of the die into the material is always the same, so that here too the material thickness has no influence on the work result.
  • All machines have a height-adjustable ram 1 and a press table 2 arranged underneath.
  • the tappet 1 is connected to two connecting rods 3 which are mounted in a crankshaft 4 arranged in the upper part of the machine.
  • the plunger 1 is adjustable in height with respect to the connecting rods 3, which is known per se.
  • a known adjusting mechanism 5 is provided, which is connected to a servo motor 7 via a spline shaft 6.
  • the spline 6 enables the servo motor 7 to be fixed in place while the spline can move with the stroke of the ram.
  • the ram By actuating the servo motor 7, the ram can be raised or lowered relative to the connecting rods 3 via the adjusting gear 5. The stroke is not adjusted, but rather the effective connecting rod length.
  • An upper tool half 8 is arranged on the underside of the ram 1, while a lower tool half 9 is arranged on the upper side of the press table 2.
  • a feed device 10 is arranged to the side of the tools, with which sheet metal strips are intermittently passed between the tool halves.
  • a pressure sensor 11 is provided in the area of the tool halves 8 and 9.
  • the pressure sensor 11 consists of a base body 12 made of polyformaldehyde, in which a piezo element 13 is embedded.
  • the base body 12 is covered by a metal pressure plate 14.
  • the piezo element 13 is connected to an evaluation device 15, which forwards to a converter which transmits the pressure signal received by the piezo element, depending on whether the measured pressure is higher or lower than a predetermined target value.
  • the converter 16 sends a signal to an angle encoder 17 of the servo motor 7, so that the ram height is adjusted via the servo motor and the angle gear, and the depth of the plunger is thereby regulated.
  • the base body 12 of the pressure transducer 11 is let into the lower tool half 9 and in such a way that the pressure plate 14 of the pressure transducer is arranged flush with the upper side 18 of the lower tool half 9.
  • the pressure transducer 11 is installed in the lower tool half 9 before the lower tool half is ground flat on its upper side. From Fig. 1 it can be clearly seen that 9 individual punches 19 are arranged on the underside of the upper tool.
  • a pressure piece 20 is provided, which lies exactly above the pressure plate 14 of the pressure sensor 11.
  • This arrangement of the pressure transducer 11 is particularly suitable when the tool halves 8 and 9 are provided for punching out workpieces, ie when they are provided with cutting dies 19 are. Then it depends on the fact that regardless of any machine or material conditions, the depth of immersion of the punch 19 in the associated matrices of the lower tool half 9 is always the same so that the workpieces are cut out. When the punch is heated, however, components such as the connecting rods 3 and the plunger 1 expand, so that the immersion depth of the cutting punches 19 would change if the plunger immersion depth were not readjusted. In the arrangement shown in FIG. 1, the pressure between the two tool halves is therefore measured, which is measured on the tool halves 8 and 9 during the cutting outside the cutting punches 19.
  • the evaluation device 15 which carries out a corresponding setpoint / actual value comparison, effects a corresponding actuation of the servo motor 7 via the converter 16 and the angle encoder 17, which then reduces the immersion depth of the plunger 1 via the adjustment gear 5.
  • the plunger immersion depth is increased in an analogous manner.
  • the second exemplary embodiment of a press according to the invention shown in FIG. 3 differs from the previously described exemplary embodiment essentially in that two pressure transducers 11 are provided which are embedded in the lower tool half 9 in such a way that their pressure plate 14 is flush with the underside 21 of the lower one Tool half 9 completes and touches the top 22 of the press table 2.
  • the tool halves 8 and 9 are an embossing tool; Embossing dies 23 are accordingly provided in the upper tool half 8.
  • the plunger 1 moves up and down in the rhythm of the crankshaft 4, the dies 23 press on the material, not shown here, guided by the feed device 10 between the tool halves 8 and 9.
  • the pressure exerted is from measured the two pressure transducers 11 and signaled to the evaluation device 15. If, when the press heats up, the pressure measured by the pressure transducers 11 increases during the operation of the press, the evaluation device 15 sends a signal to the servo motor 7 via the converter 16 and the angle encoder 17, whereupon the latter reduces the immersion depth of the plunger 1 via the adjustment gear 5 To the extent that the actual pressure continuously measured by the pressure sensor 11 corresponds to the predetermined target pressure.
  • the depth of the plunger 1 is increased in an analogous manner. This ensures that the dies 23 always penetrate the material with the same pressure, so that all the stampings produced with the press have the same appearance, regardless of any material fluctuations, since these material fluctuations also increase or decrease the result in pressure measured by the pressure transducers and thus cause an adjustment of the plunger immersion depth.
  • FIG. 4 shows a third exemplary embodiment in which the base body 12 of the pressure sensor 11 is let into the press table 2, so that the pressure plate 14 lies on the upper side 22 of the press table 2 and touches the lower side 21 of the lower tool half 9.
  • the tool halves 8 and 9 are also designed as embossing tools. The operation of this press corresponds to the press shown in Fig. 3, but both tool halves 8 and 9 can be exchanged for another tool without the pressure sensor 11 having to be replaced. If the press is to be converted, it is therefore only necessary to specify a new pressure setpoint for the evaluation device 15.
  • FIGS. 3 and 4 are described using embossing tools and the exemplary embodiment according to FIGS. 1 and 2 using a cutting tool, it is also conceivable to use cutting tools in the presses according to FIGS. 3 and 4 and in the press according to FIG. 1 and 2 to use an embossing tool or a combination of cutting and embossing tool.
  • the pressure body prefferably be made of a material other than plastic, e.g. As rubber, to manufacture, a material of high elasticity is preferred, the tensile strength is 50-70 N / cm2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Control Of Presses (AREA)
  • Punching Or Piercing (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP89119435A 1988-11-03 1989-10-19 Presse ou poinçonneuse Expired - Lifetime EP0367035B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89119435T ATE79801T1 (de) 1988-11-03 1989-10-19 Presse oder stanze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8813774U 1988-11-03
DE8813774U DE8813774U1 (de) 1988-11-03 1988-11-03 Presse oder Stanze

Publications (2)

Publication Number Publication Date
EP0367035A1 true EP0367035A1 (fr) 1990-05-09
EP0367035B1 EP0367035B1 (fr) 1992-08-26

Family

ID=6829508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119435A Expired - Lifetime EP0367035B1 (fr) 1988-11-03 1989-10-19 Presse ou poinçonneuse

Country Status (4)

Country Link
EP (1) EP0367035B1 (fr)
AT (1) ATE79801T1 (fr)
DD (1) DD285951A5 (fr)
DE (2) DE8813774U1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992002361A1 (fr) * 1990-08-07 1992-02-20 O & K Geissler Gmbh Machine-outil travaillant des metaux par formage et par coupage ayant un dispositif d'ajustage situe dans une partie mobile de la machine
EP0554501A1 (fr) * 1991-06-28 1993-08-11 Aida Engineering Ltd. Dispositif de correction de la position du point mort inférieur d'une presse
US5379688A (en) * 1991-12-03 1995-01-10 Ishii; Mitishi Method of and apparatus for automatically controlling pressing force of press machine
EP0741001A3 (fr) * 1995-05-04 1997-02-26 Gietz Ag Estampeuse, imprimeuse et poinçonneuse
EP1177885A1 (fr) * 2000-08-01 2002-02-06 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
EP1308268A1 (fr) * 2001-11-06 2003-05-07 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
EP1533109A3 (fr) * 2003-11-12 2007-12-12 Tom Engmann Poinçon de presse pour la fabrication des ébauches de carreaux en céramique et presse équipée de ce poinçon
DE102008011375A1 (de) * 2008-02-27 2009-09-10 A. Schaal Gmbh & Co. Werkzeug- Und Maschinenbau Antriebseinrichtung für eine Presse
DE102007062458A1 (de) * 2007-12-22 2009-09-10 A. Schaal Gmbh & Co. Werkzeug- Und Maschinenbau Antriebseinrichtung für eine Presse
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015211622A1 (de) 2015-06-23 2016-12-29 Multivac Sepp Haggenmüller Se & Co. Kg Tiefziehverpackungsmaschine mit Folienstanze

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010679A (en) * 1967-09-25 1977-03-08 International Measurement & Control Co. Piezoelectric transducer sensor for use in a press
DE2814988A1 (de) * 1978-04-07 1979-10-11 Klaus Brankamp System Prozessa Verfahren zur messung und/oder zur fuer eine steuerung auswertbaren darstellung einer kraft
DE2833829A1 (de) * 1978-08-02 1980-02-21 Schuler Gmbh L Schaltungsanordnung fuer einen stellantrieb einer stoesselverstellung
EP0145001A2 (fr) * 1983-12-12 1985-06-19 Pfister GmbH Dispositif de mesure de force
DE3439459A1 (de) * 1983-12-29 1985-07-11 Fukui Machinery Co., Ltd., Fukui Vorrichtung zur automatischen korrektur der position eines schlittens in einer presse
JPS63180400A (ja) * 1987-01-23 1988-07-25 Nkk Corp プレス機の自動荷重制御装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010679A (en) * 1967-09-25 1977-03-08 International Measurement & Control Co. Piezoelectric transducer sensor for use in a press
DE2814988A1 (de) * 1978-04-07 1979-10-11 Klaus Brankamp System Prozessa Verfahren zur messung und/oder zur fuer eine steuerung auswertbaren darstellung einer kraft
DE2833829A1 (de) * 1978-08-02 1980-02-21 Schuler Gmbh L Schaltungsanordnung fuer einen stellantrieb einer stoesselverstellung
EP0145001A2 (fr) * 1983-12-12 1985-06-19 Pfister GmbH Dispositif de mesure de force
DE3439459A1 (de) * 1983-12-29 1985-07-11 Fukui Machinery Co., Ltd., Fukui Vorrichtung zur automatischen korrektur der position eines schlittens in einer presse
JPS63180400A (ja) * 1987-01-23 1988-07-25 Nkk Corp プレス機の自動荷重制御装置

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992002361A1 (fr) * 1990-08-07 1992-02-20 O & K Geissler Gmbh Machine-outil travaillant des metaux par formage et par coupage ayant un dispositif d'ajustage situe dans une partie mobile de la machine
US5381681A (en) * 1990-08-07 1995-01-17 O & K Geissler Gmbh Machine with an adjusting device located in a movable machine part
EP0554501A1 (fr) * 1991-06-28 1993-08-11 Aida Engineering Ltd. Dispositif de correction de la position du point mort inférieur d'une presse
US5379688A (en) * 1991-12-03 1995-01-10 Ishii; Mitishi Method of and apparatus for automatically controlling pressing force of press machine
EP0741001A3 (fr) * 1995-05-04 1997-02-26 Gietz Ag Estampeuse, imprimeuse et poinçonneuse
US5746122A (en) * 1995-05-04 1998-05-05 Maschinenfabrik Gietz Ag Embossing machine
EP1177885A1 (fr) * 2000-08-01 2002-02-06 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
EP1308268A1 (fr) * 2001-11-06 2003-05-07 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
EP1533109A3 (fr) * 2003-11-12 2007-12-12 Tom Engmann Poinçon de presse pour la fabrication des ébauches de carreaux en céramique et presse équipée de ce poinçon
DE102007062458A1 (de) * 2007-12-22 2009-09-10 A. Schaal Gmbh & Co. Werkzeug- Und Maschinenbau Antriebseinrichtung für eine Presse
DE102007062458B4 (de) * 2007-12-22 2011-05-19 Schaal Engineering Gmbh Antriebseinrichtung für eine Presse
DE102008011375A1 (de) * 2008-02-27 2009-09-10 A. Schaal Gmbh & Co. Werkzeug- Und Maschinenbau Antriebseinrichtung für eine Presse
DE102008011375B4 (de) * 2008-02-27 2010-06-02 A. Schaal Gmbh & Co. Werkzeug- Und Maschinenbau Antriebseinrichtung für eine Presse
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
DE58902145D1 (de) 1992-10-01
ATE79801T1 (de) 1992-09-15
EP0367035B1 (fr) 1992-08-26
DD285951A5 (de) 1991-01-10
DE8813774U1 (de) 1990-03-01

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