EP0316519B1 - Verfahren zur Messung und Korrektur der Stösselverstellung bei schnellaufenden Hubpressen und Schaltung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Messung und Korrektur der Stösselverstellung bei schnellaufenden Hubpressen und Schaltung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0316519B1
EP0316519B1 EP19880113357 EP88113357A EP0316519B1 EP 0316519 B1 EP0316519 B1 EP 0316519B1 EP 19880113357 EP19880113357 EP 19880113357 EP 88113357 A EP88113357 A EP 88113357A EP 0316519 B1 EP0316519 B1 EP 0316519B1
Authority
EP
European Patent Office
Prior art keywords
ram
measured
circuit
press
reversal point
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
EP19880113357
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German (de)
English (en)
French (fr)
Other versions
EP0316519A1 (de
Inventor
Helmuth Frisch
Johann Hartinger
Alois Weber
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.)
S+S Elektronik Geraetebau GmbH
Original Assignee
S+S Elektronik Geraetebau GmbH
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Publication date
Application filed by S+S Elektronik Geraetebau GmbH filed Critical S+S Elektronik Geraetebau GmbH
Publication of EP0316519A1 publication Critical patent/EP0316519A1/de
Application granted granted Critical
Publication of EP0316519B1 publication Critical patent/EP0316519B1/de
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
    • B30B15/0029—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
    • 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]

Definitions

  • the invention relates to a method according to the preamble of claim 1 and to a circuit for performing such a method.
  • a circuit arrangement by means of which the actual value immersion depth of such a tappet is determined by inductive measurement and with which a corresponding actual / target value comparison is then possible in order to carry out the required correction is known from DE-C 27 31 084.
  • the tappet adjustment at stroke rates of over 600 strokes per minute is corrected by means of a motor which acts via a gear train with a high reduction ratio on a pin bearing adjusting element, by means of which the tappet opposes its drive member is adjustable, wherein the immersion depth can be changed, that is, corrected in the desired manner.
  • this known circuit can also be used to make a correction via a program stored in a memory, and depending on the number of strokes, according to this program, monostable flip-flops are supplied with control signals which in turn control the correction motor according to the signal information.
  • Another known circuit arrangement for an actuator of a tappet adjustment uses at least one limit switch for detecting the immersion depth, which is adjustably attached to the press frame in the action of the tappet and whose signal output is connected to the set input of a first flip-flop, the latter Signal output is in turn coupled back to a reset input of a further flip-flop by means of a branch line via a switching stage which determines the size of an adjustment step, a set input of a further flip-flop with a switch activated when the cutting press is interrupted and a reset input of the latter flip-flop.
  • Flops is connected to another switch, which is activated when the plunger has reached a lowermost position relative to its drive element, which it must not fall short of depending on the tool.
  • the two known circuit arrangements have the advantage that the ram adjustment is possible during the operation of the press, on the other hand however, the main disadvantage that these are very complex circuit arrangements, with a correspondingly high outlay on costs for both the hardware and the software side.
  • the present invention uses this known prior art and it is based on the object of providing a method and a circuit arrangement of the generic type and designing such that the plunger immersion depth measurements and the corrections which can be carried out with them are carried out with the least possible susceptibility to malfunction and with a manageably low outlay on equipment becomes possible.
  • the present task solution advantageously enables the increasingly precise tools of the type of interest here to be able to adapt to the higher quality requirements, even with an increased stroke rate of the presses.
  • Special parts in the electrical and electronics industry can therefore be manufactured with very tight tolerances regardless of the stroke speed, specifically for stroke speeds that can be, for example, 2000 strokes per minute.
  • the measuring system used is robust enough to withstand the harsh environmental conditions prevailing for such press operations without that this affects its high measuring accuracy.
  • the implementation of the method with the associated circuit arrangement is simple, in particular also for the operator of the press, whereby restrictions on the tool installation space, in contrast to the prior art, are practically completely eliminated. It is also not necessary in the present solution to the problem to have to make readjustments, or to have to carry out special mechanical adjustments and thus time-consuming work on the press itself.
  • a tape applied to a metal band and magnetized at certain high-precision intervals serves as a measuring ruler, while the sensor head is characterized by four coils that are fed with a carrier frequency, the voltage induced in the coils being fed to the function evaluation by the relative movement between the metal band and the sensor . Because the coil arrangement in the detector head supplies two sine voltages offset by ninety degrees, a directional detection of the relative movement between the metal strip and the sensor head and thus between the ram movement and the press frame can be predefined in a simple manner.
  • the evaluation of the inductive and thus non-contact measurement method is particularly simple in that first a rough path measurement is carried out by generating counting pulses at the zero crossings of the sine / cosine functions and that the amplitude value is stored at the reversal points for the two functions and this for the exact ones Measurement is evaluated.
  • the relative movement can be used to convert a press between the sensor head and the permanent magnetic head are used in the same way as for the evaluation of their automatic operation, in which the deviation that may be present is first measured and displayed and, after the deviation has been measured, the machine is stopped, if the measurement proves that a correction is necessary, which in turn then is carried out automatically.
  • Block 3 takes the magnetic ruler 1, which is characterized by alternating magnetic poles (cf. also FIG. 3) that alternate every two millimeters in length and are applied to a suitable metal strip.
  • the block 3 is firmly attached to the machine frame of the press, for which the receiving channel is used. It is also possible to fix the block 3 not on the static press part but on the moving tool part.
  • the sensor head 4 consists essentially of a detector 2, in which four coils are accommodated, which are acted upon with a suitable carrier frequency.
  • the relative movement between the fixed tool half of the press and the moving tool half, i.e. the plunger, corresponds to the relative movement between the magnetic ruler 1 and the sensor head 4, the detector 2 being moved close to and parallel to the magnetic ruler in the direction of the double arrow shown.
  • the contactless length measurement of the distance covered in this way along the north-south pole arrangement which changes every two millimeters at a distance between the magnetic ruler 1 and detector 2 of 0.1 to a maximum of 0.5 mm, influences the amplitude of the carrier frequency and thus modulates the carrier frequency in the Coils of the detector head 4 alternating voltages, the respective course of which corresponds to sine functions, but which are offset by 90 degrees to one another, since the distances between the individual coils are matched to the distances between the alternating north-south pole arrangements in the ruler.
  • the Voltage profiles picked up by the detector 2 in the scanning head 4 are fed via a line 6 to the plunger immersion depth measurement unit 7 and processed there in a manner to be described later.
  • a coupling piece 8 makes it possible to separate the sensor head, which in the exemplary embodiment is movably attached to the plunger, from the processing and display unit 7 and thus to install it independently at a suitable location within the press or next to it.
  • the front panel of the device 7 contains a text display for the operator, a numerical display for the measured values obtained, as well as control buttons for different functions and a key selector switch for the possible operating modes.
  • the possible operating modes consist in converting the press, in which parts of the device are set to a certain stroke and thus to a defined ram position, which is about the same as the respective tool change.
  • Another mode of operation under the term “automatic” means that the device orients itself automatically after the changeover to the new ram position, whereby it is possible that the device measures a certain deviation, then the press first stops when the deviation has a tolerance limit exceeds or falls below and then makes the necessary correction itself.
  • the device outputs are inactive; The current stroke is displayed, whereby this operating mode lies outside the actual operation of the device.
  • ventilation a mode of operation called “ventilation” is provided, which is used to travel a path for the ram in the upward direction that was defined during commissioning, that is to say to separate the two tool halves for test purposes.
  • the contactless, sliding movement of the scanning head 4 along the magnetic ruler 1 initially leads to a rough path measurement by generating counting pulses at the zero crossings of the sine curve in that one pulse results per millimeter of path.
  • the amplitude values are recorded or stored at the reversal points of the voltage curve and the counting impulses thus given are used to roughly determine the path of a specific stroke quantity.
  • the anologic sinus amplitude measured at the reversal point of the movement of the plunger see also FIG.
  • the plunger immersion depth is fundamentally continuously or variably adjustable, the respective plunger deviation being measured with increasing stroke frequency and the increase in immersion depth being measured by this increasing frequency while the press is running and this is then stopped when a set tolerance limit is either reached is exceeded or undershot upwards or downwards.
  • the deviation that has occurred is corrected during the downtime of the press, for which purpose the press is switched from the "continuous operation" mode to "setup", that is to say discontinuous operation. After taking into account the correction that has become necessary, the press then continues to operate until the set tolerance range is left again or until the press may need to be set up again.
  • the use of the scanning head 4 in connection with the magnetic ruler 1 in the embodiment shown in FIG. 1 is particularly advantageous insofar as the corrections that can be predetermined thereby are independent of the actual tool, ie the ram and the like. as well as the fixed press half, ie that wear of the individual tool parts does not impair the measuring process, as is the case, for example, with the ram correction using the known limit switches.
  • the sine / cosine curve in the coils within the sensor head 4, which are offset by one millimeter from one another in the exemplary embodiment, is shown in FIG. 2 at the reversal point of the up-down movement of a plunger.
  • the reversal point For the measurement of the reversal point, it is ultimately of no interest how many sine or cosine periods are traversed to the reversal point of the ram; the only thing of interest for the measurement of the reversal point is the last maximum of the sine or cosine function before the reversal point or the amplitude of the functions directly at the reversal point.
  • One of these values is used for the evaluation as a reference voltage and the last one in each case voltage value occurring at the reversal point as a measured value. As can be seen from FIG.
  • the reversal point practically represents a mirror plane for both the sine and the cosine function, which precisely defines the measured value and the reference value for the evaluation electronics and, in the exemplary embodiment, a deviation from the desired immersion depth with an accuracy of up to 1 / 100 millimeters.
  • Fig. 3 shows a block circuit diagram of a circuit which enables the aforementioned functions.
  • the scanning head 4 which is guided past the magnetic ruler at a distance, outputs, via the detector 2 consisting of four coils, which are fed via an oscillator 10 with a suitable carrier frequency, the signals which are modulated by the relative movement between the detector 2 and the magnetic ruler 1 in the form of the aforementioned sine waves. respectively.
  • Cosine signals each directly to an associated low-pass filter 12, 13 or via the digital analog converter 11, 14 to the other low-pass filter 13, 12.
  • Each of the low-pass filters 12, 13 is on the output side with the two peak value memories 15, 17 and 21, 22, one Rectifiers 19 and 43, respectively, and a converter 20, 24 are connected in the manner given in the functional representation.
  • An electronic relay 25 switches the analog output signal information of the modules 19 and 23 to digital commands and leads these digital signals alternately to a peak value memory 28, which is followed by an analog measured value memory 29, corresponding to the analog measured value memories 16, 18, 26 and 27 are connected to the outputs of the peak value memories 15, 17, 21 and 22.
  • the signals obtained by the amplitude values of the coils of the detector 2 are used as path information, the demodulated associated direct voltage components, which are superimposed on the alternating voltage components, by measuring the positive and negative peak values and digitizing these measured values for a computer-controlled correction.
  • the integrated switching logic 30, which bwz with the converters 20.
  • the outputs of the analog measured value memories 16, 18, 26, 27 and 29 are at the inputs of a multiplexer 31, the output information of which is amplified by an impedance converter 22 and can be fed to the memory logic 34 via the analog digital converter 33.
  • the multiplexer 31 which can be switched over by the computer and whose outputs feed an analog-digital converter as described above, the computer logic thus has access to each individual peak value which is supplied via the individual peak value memories.
  • Half the difference between the peak values corresponds to the DC voltage offset, which is output with the correct sign at the respective digital / analog converter and subtracted at the signal input.
  • the digital-analog converter signal (14, 11) on the output side passes through the low-pass filters 13, 12 in order to suppress the demodulated carrier frequency components (sine / cosine).
  • the rectified signals are output in the manner described above from the rectifiers 19, 23 to the changeover switch 25, which, controlled by the logic circuit 30, switches through the signal clearly identified with the last maximum at the point of reversal, to the downstream peak value memory, while at the same time via the logic circuit 30, according to the reversal of direction indicated at the point of reversal, the voltage maximum is stored in the associated measured value memory.
  • the distance in the exemplary embodiment is interpolated within a millimeter to within a hundredth of a millimeter.
  • the measurement of the values added to one millimeter in each case is carried out by the computer 34 by enumerating the zero crossings of the sine and cosine signals.
  • the zero crossings are processed via the logic circuit in the memory 34.
  • the logic memory 34 is also connected to the display and operating part 35 and, of course, the inputs and outputs 36.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP19880113357 1987-11-17 1988-08-17 Verfahren zur Messung und Korrektur der Stösselverstellung bei schnellaufenden Hubpressen und Schaltung zur Durchführung des Verfahrens Expired - Lifetime EP0316519B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873739023 DE3739023A1 (de) 1987-11-17 1987-11-17 Verfahren zur messung und korrektur der stoesselverstellung bei schnellaufenden hubpressen und schaltung zur durchfuehrung des verfahrens
DE3739023 1987-11-17

Publications (2)

Publication Number Publication Date
EP0316519A1 EP0316519A1 (de) 1989-05-24
EP0316519B1 true EP0316519B1 (de) 1991-05-29

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EP19880113357 Expired - Lifetime EP0316519B1 (de) 1987-11-17 1988-08-17 Verfahren zur Messung und Korrektur der Stösselverstellung bei schnellaufenden Hubpressen und Schaltung zur Durchführung des Verfahrens

Country Status (4)

Country Link
US (1) US4890468A (enExample)
EP (1) EP0316519B1 (enExample)
JP (1) JPH01156601A (enExample)
DE (2) DE3739023A1 (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5209091A (en) * 1992-11-05 1993-05-11 Koenigbauer Gerald J Apparatus for setting the shut height of a press
US5512077A (en) * 1994-05-27 1996-04-30 Owens-Brockway Glass Container Inc. Test apparatus and testing method for a position sensor in a glassware forming machine
EP0732194B1 (de) * 1995-03-17 2000-02-16 Bruderer Ag Verfahren und Vorrichtung zur Messung und Regelung der Höhenstellung des Stössels einer schnellaufenden Schnittpresse
US6550361B1 (en) 2000-06-14 2003-04-22 Mead Westvaco Corporation Platen die cutting monitoring system
DE102011107777A1 (de) 2011-07-15 2013-01-17 Phoenix Contact Gmbh & Co. Kg Vorrichtung und Verfahren zur sicheren Bewegungserkennung mit Toleranzschwelle
CN115268335A (zh) * 2022-08-10 2022-11-01 江西安百川电气有限公司 一种冷镦机电气控制系统

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582924A (en) * 1968-05-17 1971-06-01 Sony Corp Displacement measuring instrument
JPS4835017B1 (enExample) * 1968-10-02 1973-10-25
JPS5725766B2 (enExample) * 1973-12-12 1982-06-01
DE2731084C3 (de) * 1977-07-09 1980-07-03 L. Schuler Gmbh, 7320 Goeppingen Stößelverstellung für schnellaufende Schnittpressen
DE2833829C2 (de) * 1978-08-02 1986-11-27 L. Schuler GmbH, 7320 Göppingen Schaltungsanordnung für einen Stellantrieb einer Stößelverstellung
JPS5559314A (en) * 1978-10-27 1980-05-02 Sony Corp Magnetic scale signal detector
DE2925902A1 (de) * 1979-06-27 1981-01-15 Manfred Wanzke Signalvorrichtung zur erzeugung von elektrischen steuersignalen fuer eine steuervorrichtung einer presse
DE2945895C2 (de) * 1979-11-14 1986-06-05 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Magnetischer Stellungsgeber für hydrauliche oder pneumatische Arbeitszylinder
US4408471A (en) * 1980-10-29 1983-10-11 Massachusetts Institute Of Technology Press brake having spring-back compensating adaptive control
JPS6023897B2 (ja) * 1982-07-06 1985-06-10 平田プレス工業株式会社 シャットハイト調整に応動するボルスタ上限位置検出スイッチ取付位置自動調整装置
US4463333A (en) * 1982-09-29 1984-07-31 Farrand Industries, Inc. Transformer-type position transducer
DE3244891C2 (de) * 1982-12-04 1985-07-11 Angewandte Digital Elektronik Gmbh, 2051 Brunstorf Einrichtung zur berührungslosen Positionsmessung
US4514689A (en) * 1982-12-27 1985-04-30 Varian Associates, Inc. High resolution position sensing apparatus with linear variable differential transformers having phase-shifted energizing signals
SU1082536A1 (ru) * 1983-01-19 1984-03-30 Воронежское Производственное Объединение По Выпуску Кузнечно-Прессового Оборудования Им.М.И.Калинина Система управлени молотом
SU1171171A1 (ru) * 1983-02-16 1985-08-07 Voronezh Proizv Ob Vypusk Устройство управления пневматическим молотом
SU1175632A1 (ru) * 1984-01-06 1985-08-30 МВТУ им.Н.Э.Баумана Система управлени штамповочным молотом
US4802357A (en) * 1987-05-28 1989-02-07 The Boeing Company Apparatus and method of compensating for springback in a workpiece

Also Published As

Publication number Publication date
DE3739023A1 (de) 1989-05-24
DE3739023C2 (enExample) 1993-08-05
EP0316519A1 (de) 1989-05-24
US4890468A (en) 1990-01-02
JPH01156601A (ja) 1989-06-20
DE3863057D1 (de) 1991-07-04

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