EP1346821B1 - Position measurement machine for a powder press - Google Patents

Position measurement machine for a powder press Download PDF

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Publication number
EP1346821B1
EP1346821B1 EP03005213A EP03005213A EP1346821B1 EP 1346821 B1 EP1346821 B1 EP 1346821B1 EP 03005213 A EP03005213 A EP 03005213A EP 03005213 A EP03005213 A EP 03005213A EP 1346821 B1 EP1346821 B1 EP 1346821B1
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EP
European Patent Office
Prior art keywords
measuring
ruler
arms
stamping die
powder press
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EP03005213A
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German (de)
French (fr)
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EP1346821A2 (en
EP1346821A3 (en
Inventor
Jürgen Hinzpeter
Ingo Schmidt
Andreas Groth
Andreas Teetzen
Thomas Pannewitz
Udo Baltruschat
Thorsten Erich
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Fette GmbH
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Fette GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements

Definitions

  • the invention relates to a method for measuring the distance of at least one upper and lower punch of a powder press according to the preamble of patent claim 1.
  • a path measurement can be achieved by detecting the travel of the piston of a hydraulic cylinder which actuates the ram. Due to the forces occurring during pressing, there is a springing of the machine frame and possibly also to a compression of the punch and the piston rod. The measured values are then no longer the actual ones. If the die has a conical shape, the die table also deflects. Therefore, a distance measurement on the hydraulic cylinders can also serve only for coarse measurement.
  • the measuring arm is to be attached to the press punches laterally angeord with the eccentric Neten vertical measuring ruler, which is designed for example as an incremental transducer, cooperates.
  • the eccentric Neten vertical measuring ruler which is designed for example as an incremental transducer, cooperates.
  • measuring errors can occur.
  • a tilting of the arm can take place or a deflection.
  • a further falsification of the measurement result can result from the fact that the ram undergoes a tilt by tilting, which is communicated to the cantilevered measuring arm.
  • the error described becomes particularly serious when, for example, in a ram a so-called center pin is guided, which is also actuated by a hydraulic cylinder and whose path is also to be measured accurately. Due to constructive circumstances, the position measuring system is to be arranged relatively far outside the center axis of the center pin. Deviations of the center pin from its central position or deformations or pivoting of the measuring arm therefore lead to particularly serious measurement errors.
  • the invention has for its object to provide a method for measuring distance for a powder press, can be compensated in the measurement error in an eccentrically arranged position measuring system.
  • At least two measuring arms are mounted on opposite sides of at least the upper or lower punch and each measuring arm cooperates with a measuring ruler.
  • the Measured variables are given to the computer, wherein a faulty measured variable is compensated by the second.
  • the invention assumes that e.g. Upon a change in the bearing of the measuring arm due to a friction on the measuring ruler of the other measuring arm accordingly undergoes a shift in the opposite direction. This is particularly the case when the two measuring arms are formed by a common lever, the measuring rulers are arranged on diametrically opposite sides of the ram.
  • a displacement of a measuring arm can also be done by the measuring arms are guided by a linear vertical guide. While the guides are intended to help prevent displacement of the measuring arms, they can not always do so. Again, the displacement of the measuring arm on one side of the ram would lead to an opposite displacement of the measuring arm on the opposite side.
  • a powder press 10 can be seen, which has a frame 12.
  • An upper plate 14 of the frame supports a hydraulic cylinder 16, the piston 18 actuates an upper punch 20.
  • a lower plate 22 of the frame 12 supports a lower hydraulic cylinder 24, which operates a lower punch 26, with the interposition of a box-shaped member 28, which will be discussed below.
  • a die plate 30 is fixedly mounted in the frame 12 and receives in a bore a die 32, with which upper and lower punches 20, 26 cooperate, as shown, for the production of a compact 34th
  • a center pin 36 which is actuated by a hydraulic cylinder 38 extends.
  • the hydraulic cylinder 38 is supported on the bottom of the box-shaped component 28. It serves to produce a central hole in the compact 34.
  • an arm 40 or 42 is connected on diametrically opposite sides, which interact with a vertical measuring ruler 44 and 46, respectively, as known per se. It is e.g. around known per se incremental transducer.
  • the measuring rulers 44, 46 are firmly connected to the die plate 30. With the help of the measuring rulers, it is possible to determine the exact path of the upper punch 20 relative to the die plate 30.
  • a cross bar 56 is connected within the box-shaped member 28, which forms a measuring arm on opposite sides of the center pin 36, comparable to the measuring arms 40, 42 and 48,50. she cooperate with measuring rulers 58 and 60 within the component 28.
  • linear vertical guides 62 and 64 are arranged on opposite sides on both sides of the center pin 36 and the hydraulic cylinder 38. They serve to stir the movement of the measuring arms of the rod 56 so that it moves in an exact horizontal plane with the center pin 36, so that the measuring rulers 58, 60 determine the exact way.
  • a displacement of the measuring arms can occur, as in Fig. 2 is shown.
  • a measuring system for example, the right in Fig.
  • a displacement of the right measuring arm results in a difference between the distance traveled 70 and the measured distance 72.
  • the difference is attributed to the tilting (exaggerated) of the center pin 36.
  • the measured path 74 is greater than the actually traveled path 76.
  • this compensation principle also for the measuring systems for the upper punch 20 and the lower punch 26, as they are in Fig. 1 are shown, can be applied.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Control Of Presses (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

The distance-measuring system for a powder press (10) having at least one upper and lower plunger (20, 26) comprises at least two measuring arms (40, 42, 48, 50, 56) on opposite-lying sides which interact at the upper and lower plunger with a measuring ruler (44, 46, 52, 54). The results are put into a computer which compensates for an erroneous measurement variable on one measuring ruler using the second measuring variable on the other measuring ruler. Preferred Features: At least three measuring systems are arranged the same peripheral distance away from the upper and lower plunger.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Wegmessung mindestens eines Ober- und Unterstempels einer Pulverpresse nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for measuring the distance of at least one upper and lower punch of a powder press according to the preamble of patent claim 1.

Für die Herstellung maßgenauer Preßlinge ist die Positioniergenauigkeit von Ober- und Unterstempel einer Pulverpresse, beispielsweise einer Metallpulverpresse, von großer Bedeutung. Eine Genauigkeit von < 0,01 mm muß eingehalten werden.For the production of dimensionally accurate compacts, the positioning accuracy of the upper and lower punches of a powder press, for example a metal powder press, is of great importance. An accuracy of <0.01 mm must be maintained.

Eine Wegmessung kann dadurch erzielt werden, daß der Weg des Kolbens eines Hydraulikzylinders erfaßt wird, der den Preßstempel betätigt. Aufgrund der beim Pressen auftretenden Kräfte kommt es zu einer Auffederung des Maschinengestells und gegebenenfalls auch zu einem Stauchen des Stempels und der Kolbenstange. Die gemessenen Werte entsprechen dann nicht mehr den tatsächlichen. Hat die Matrize eine kegelige Form, kommt es ferner zu einer Durchbiegung des Matrizentisches. Daher kann eine Wegmessung an den Hydraulikzylindern auch nur zur Grobmessung dienen.A path measurement can be achieved by detecting the travel of the piston of a hydraulic cylinder which actuates the ram. Due to the forces occurring during pressing, there is a springing of the machine frame and possibly also to a compression of the punch and the piston rod. The measured values are then no longer the actual ones. If the die has a conical shape, the die table also deflects. Therefore, a distance measurement on the hydraulic cylinders can also serve only for coarse measurement.

Aus DE 199 19 693 ist bekannt geworden, eine Positionsbestimmung eines Preßstempels bezüglich einer Matrize dadurch zu erhalten, daß bei Annäherung des Preßstempels an die Matrize die Positionsbestimmung mit Hilfe eines inkrementalen Wegaufnehmers erfolgt. Um den Übergang ohne Fehler zu gewährleisten, wird in einem Rechner ein Referenzmaß gespeichert, das einem vorgegebenen relativ geringen Abstand des Preßstempels zur Oberkante oder Unterkante der Matrize entspricht. Im Rechner wird darüber hinaus ein Referenzoffset gespeichert, der dadurch ermittelt wird, daß die Impulse eines vom Preßstempel betätigten inkrementalen Wegaufnehmers beim Hochfahren des Preßstempels vom Referenzmaß bis zum Indeximpuls gezählt werden. Oberhalb des Referenzoffset wird die Position des Preßstempels mit Hilfe des bereits erwähnten absoluten Wegaufnehmers gemessen, der den Weg des Kolbens ermittelt. Sobald die Erstposition des Preßstempels gleich oder kleiner ist als das Summenmaß von Referenzoffset und Referenzmaß, werden die Impulse des inkrementalen Wegaufnehmers zur Positionierung in den Rechner gegeben.Out DE 199 19 693 It has become known to obtain a position determination of a press ram with respect to a die in that, when the press ram approaches the die, the position is determined by means of an incremental position sensor. To ensure the transition without errors, a reference measure is stored in a computer, the corresponds to a predetermined relatively small distance of the press ram to the upper edge or lower edge of the die. In addition, a reference offset is stored in the computer, which is determined by counting the pulses of an incremental position transducer actuated by the press ram when the press ram is raised from the reference dimension to the index pulse. Above the reference offset, the position of the ram is measured by means of the already mentioned absolute transducer, which determines the travel of the piston. As soon as the initial position of the press ram is equal to or smaller than the sum of the reference offset and the reference dimension, the pulses of the incremental position transducer are placed in the computer for positioning.

Aus US 4,270,890 gemäß dem Oberbegriff des Anspruchs 1 ist bekannt geworden mit einer Matrizenplatte einer Pulverpresse einen Meßarm zu koppeln, der mittels hydraulischer Verstellung in seine Position verändert werden kann. Der Meßarm wirkt mit einem gestellfesten Meßlineal zusammen. In der Druckschrift ist auch angegeben, Meßarm und Meßlineal auf einer gegenüberliegenden Seite der Presse anzuordnen.Out US 4,270,890 According to the preamble of claim 1, it has become known to couple a measuring arm with a die plate of a powder press, which can be changed into its position by means of hydraulic adjustment. The measuring arm cooperates with a frame-fixed measuring ruler. The document also states that the measuring arm and measuring ruler are to be arranged on an opposite side of the press.

Aus konstruktiven Gründen ist es nicht möglich, das inkrementale Meßsystem in die Achse der Preßstempel zu legen. Vielmehr ist an den Preßstempeln seitlich der Meßarm anzubringen, der mit dem exzentrisch angeord neten vertikalen Meßlineal, das z.B. als inkrementaler Wegaufnehmer ausgebildet ist, zusammenwirkt. Bei einem derartigen Meßsystem können jedoch ebenfalls Meßfehler auftreten. So kann z.B. durch Reibung des Meßarms an dem Meßlineal ein Kippen des Armes erfolgen bzw. eine Durchbiegung. Eine weitere Verfälschung des Meßergebnisses kann dadurch entstehen, daß der Preßstempel durch Kippen eine Neigung erfährt, die dem auskragenden Meßarm mitgeteilt wird. Der beschriebene Fehler wird insbesondere dann gravierend, wenn z.B. in einem Preßstempel ein sogenannter Mittelstift geführt ist, der gleichfalls durch einen Hydraulikzylinder betätigt wird und dessen Weg ebenfalls genau gemessen werden soll. Aufgrund konstruktiver Umstände ist das Wegmeßsystem relativ weit außerhalb der Mittenachse des Mittelstiftes anzuordnen. Abweichungen des Mittelstiftes von seiner zentralen Lage bzw. Verformungen oder Verschwenkungen des Meßarms führen daher zu besonders gravierenden Meßfehlern.For structural reasons, it is not possible to place the incremental measuring system in the axis of the ram. Rather, the measuring arm is to be attached to the press punches laterally angeord with the eccentric Neten vertical measuring ruler, which is designed for example as an incremental transducer, cooperates. In such a measuring system, however, also measuring errors can occur. Thus, for example by friction of the measuring arm on the measuring ruler, a tilting of the arm can take place or a deflection. A further falsification of the measurement result can result from the fact that the ram undergoes a tilt by tilting, which is communicated to the cantilevered measuring arm. The error described becomes particularly serious when, for example, in a ram a so-called center pin is guided, which is also actuated by a hydraulic cylinder and whose path is also to be measured accurately. Due to constructive circumstances, the position measuring system is to be arranged relatively far outside the center axis of the center pin. Deviations of the center pin from its central position or deformations or pivoting of the measuring arm therefore lead to particularly serious measurement errors.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Wegmessung für eine Pulverpresse zu schaffen, bei dem Meßfehler bei einem exzentrisch angeordneten Wegmeßsystem kompensiert werden können.The invention has for its object to provide a method for measuring distance for a powder press, can be compensated in the measurement error in an eccentrically arranged position measuring system.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Bei dem erfindungsgemäßen Verfahren werden mindestens zwei Meßarme auf gegenüberliegenden Seiten an mindestens dem Ober- oder Unterstempel angebracht und jeder Meßarm wirkt mit einem Meßlineal zusammen. Die Meßgrößen werden in den Rechner gegeben, wobei eine fehlerhafte Meßgröße durch die zweite kompensiert wird.In the method according to the invention at least two measuring arms are mounted on opposite sides of at least the upper or lower punch and each measuring arm cooperates with a measuring ruler. The Measured variables are given to the computer, wherein a faulty measured variable is compensated by the second.

Bei der Erfindung wird davon ausgegangen, daß z.B. bei einer Lagerveränderung des Meßarms aufgrund einer Reibung am Meßlineal der andere Meßarm entsprechend eine Verlagerung in die entgegengesetzte Richtung erfährt. Dies ist insbesondere der Fall, wenn die beiden Meßarme von einem gemeinsamen Hebel gebildet sind, wobei die Meßlineale auf diametral gegenüberliegenden Seiten des Preßstempels angeordnet sind.The invention assumes that e.g. Upon a change in the bearing of the measuring arm due to a friction on the measuring ruler of the other measuring arm accordingly undergoes a shift in the opposite direction. This is particularly the case when the two measuring arms are formed by a common lever, the measuring rulers are arranged on diametrically opposite sides of the ram.

Eine Verlagerung eines Meßarms kann auch dadurch geschehen, daß die Meßarme durch eine lineare vertikale Führung geführt sind. Die Führungen sollen zwar eine Verlagerung der Meßarme vermeiden helfen, können dies jedoch nicht immer. Auch hierbei würde die Verlagerung des Meßarms auf der einen Seite des Preßstempels zu einer entgegengesetzten Verlagerung des Meßarms auf der gegenüberliegenden Seite führen.A displacement of a measuring arm can also be done by the measuring arms are guided by a linear vertical guide. While the guides are intended to help prevent displacement of the measuring arms, they can not always do so. Again, the displacement of the measuring arm on one side of the ram would lead to an opposite displacement of the measuring arm on the opposite side.

Eine weitere Verfälschung des Meßergebnisses wird, wie schon oben erwähnt, dadurch erhalten, daß der Preßstempel gegenüber der exakten vertikalen Achse kippt. Das Kippen des Preßstempels zu allen möglichen Seiten kann jedoch nur dann vollständig erfaßt werden, wenn mindestens drei vorzugsweise gleichmäßig am Umfang angeordnete aus Meßarm und Meßlineal bestehende Meßsysteme vorgesehen werden. Deren Meßergebnisse werden im Rechner verarbeitet, so daß der tatsächlich zurückgelegte Weg des Preßstempels gemessen werden kann.A further falsification of the measurement result, as already mentioned above, obtained by tilting the ram against the exact vertical axis. However, the tilting of the ram to all possible sides can only be fully detected if at least three, preferably evenly arranged on the circumference consisting of measuring arm and measuring ruler measuring systems are provided. Their results are processed in the computer, so that the actually traveled path of the ram can be measured.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

Fig. 1
zeigt schematisch die Seitenansicht einer Pulverpresse mit Meßsystemen nach der Erfindung.
Fig.2
zeigt eine Einzelheit der Pulverpresse nach Fig. 1 mit einem Wegmeßsystem nach der Erfindung.
The invention will be explained in more detail with reference to drawings.
Fig. 1
schematically shows the side view of a powder press with measuring systems according to the invention.
Fig.2
shows a detail of the powder press after Fig. 1 with a position measuring system according to the invention.

In Fig. 1 ist eine Pulverpresse 10 zu erkennen, welche ein Gestell 12 aufweist. Eine obere Platte 14 des Gestells lagert einen Hydraulikzylinder 16, dessen Kolben 18 einen Oberstempel 20 betätigt. Eine untere Platte 22 des Gestells 12 lagert einen unteren Hydraulikzylinder 24, der einen Unterstempel 26 betätigt, und zwar unter Zwischenschaltung eines kastenförmigen Bauteils 28, auf den weiter unten noch eingegangen wird. Eine Matrizenplatte 30 ist fest im Gestell 12 angeordnet und nimmt in einer Bohrung eine Matrize 32 auf, mit welcher Ober- und Unterstempel 20, 26 zusammenwirken, wie gezeigt, zur Herstellung eines Preßlings 34.In Fig. 1 is a powder press 10 can be seen, which has a frame 12. An upper plate 14 of the frame supports a hydraulic cylinder 16, the piston 18 actuates an upper punch 20. A lower plate 22 of the frame 12 supports a lower hydraulic cylinder 24, which operates a lower punch 26, with the interposition of a box-shaped member 28, which will be discussed below. A die plate 30 is fixedly mounted in the frame 12 and receives in a bore a die 32, with which upper and lower punches 20, 26 cooperate, as shown, for the production of a compact 34th

Durch eine zentrische axiale Bohrung des Unterstempels 26 erstreckt sich ein Mittelstift 36, der von einem Hydraulikzylinder 38 betätigt wird. Der Hydraulikzylinder 38 stützt sich am Boden des kastenförmigen Bauteils 28 ab. Er dient zur Herstellung eines mittigen Loches im Preßling 34.Through a central axial bore of the lower punch 26, a center pin 36 which is actuated by a hydraulic cylinder 38 extends. The hydraulic cylinder 38 is supported on the bottom of the box-shaped component 28. It serves to produce a central hole in the compact 34.

Mit dem Oberstempel 20 ist auf diametral gegenüberliegenden Seiten ein Arm 40 bzw. 42 verbunden, die mit einem vertikalen Meßlineal 44 bzw. 46 schleifend zusammenwirken, wie an sich bekannt. Es handelt sich z.B. um an sich bekannte inkrementale Wegaufnehmer. Die Meßlineale 44, 46 sind fest mit der Matrizenplatte 30 verbunden. Mit Hilfe der Meßlineale ist es möglich, den exakten Weg des Oberstempels 20 relativ zur Matrizenplatte 30 zu bestimmen.With the upper punch 20, an arm 40 or 42 is connected on diametrically opposite sides, which interact with a vertical measuring ruler 44 and 46, respectively, as known per se. It is e.g. around known per se incremental transducer. The measuring rulers 44, 46 are firmly connected to the die plate 30. With the help of the measuring rulers, it is possible to determine the exact path of the upper punch 20 relative to the die plate 30.

Mit Hilfe von Meßarmen 48, 50 am Unterstempel 26 und Meßlinealen 52, 54, die mit der Unterseite der Matrizenplatte 30 verbunden sind, läßt sich auch der exakte Weg des Unterstempels 26 relativ zur Matrizenplatte bestimmen.By means of measuring arms 48, 50 on the lower punch 26 and measuring rulers 52, 54, which are connected to the underside of the die plate 30, also the exact path of the lower punch 26 can be determined relative to the die plate.

Mit dem Mittelstift 36 ist innerhalb des kastenförmigen Bauteils 28 ein Querstab 56 verbunden, der auf gegenüberliegenden Seiten des Mittelstifts 36 einen Meßarm bildet, vergleichbar der Meßarmen 40, 42 bzw. 48,50. Sie wirken mit Meßlinealen 58 bzw. 60 innerhalb des Bauteils 28 zusammen. Auf gegenüberliegenden Seiten beidseits des Mittelstiftes 36 bzw. des Hydraulikzylinders 38 sind lineare vertikale Führungen 62 bzw. 64 angeordnet. Sie dienen dazu, die Bewegung der Meßarme des Stabes 56 so zu rühren, daß er sich in einer exakten horizontalen Ebene mit dem Mittelstift 36 bewegt, so daß die Meßlineale 58, 60 den exakten Weg ermitteln. Da jedoch trotz der Führungen 62, 64 eine Verlagerung der Meßarme eintreten kann, wie dies in Fig. 2 dargestellt ist. Würde nur mit einem Meßsystem gearbeitet, beispielsweise dem rechten in Fig. 2, ergibt sich bei einer Verlagerung des rechten Meßarms eine Differenz zwischen gefahrenem Weg 70 und gemessenem Weg 72. In der vorliegenden Darstellung wird die Differenz auf das Kippen (übertrieben gezeigt) des Mittelstifts 36 zurückgeführt. Da ein zweites Meßsystem auf der linken Seite in den Fign. 1 und 2 vorgesehen ist, ist der gemessene Weg 74 größer als der tatsächlich gefahrene Weg 76. Im vorliegenden Fall kann durch Mittelwertbildung der gemessenen Fehler kompensiert werden und dadurch der tatsächlich zurückgelegte Weg des Mittelstiftes 36 erhalten werden. Es versteht sich, daß dieses Kompensationsprinzip auch für die Meßsysteme für den Oberstempel 20 und den Unterstempel 26, wie sie in Fig. 1 dargestellt sind, angewendet werden kann. Falls nur eine Kompensation der Verlagerung der Meßarme angestrebt ist, reicht der Einsatz von zwei Meßsystemen, vorzugsweise auf diametral gegenüberliegenden Seiten des Stempels bzw. des Mittelstiftes aus. Soll jedoch auch ein Kippen des Preßstempels bzw. des Mittelstiftes erfaßt werden, sind mindestens drei, vorzugsweise um 120° versetzte Meßsysteme der beschriebenen Art erforderlich, um eine Kompensation zu erhalten.With the center pin 36, a cross bar 56 is connected within the box-shaped member 28, which forms a measuring arm on opposite sides of the center pin 36, comparable to the measuring arms 40, 42 and 48,50. she cooperate with measuring rulers 58 and 60 within the component 28. On opposite sides on both sides of the center pin 36 and the hydraulic cylinder 38 linear vertical guides 62 and 64 are arranged. They serve to stir the movement of the measuring arms of the rod 56 so that it moves in an exact horizontal plane with the center pin 36, so that the measuring rulers 58, 60 determine the exact way. However, since despite the guides 62, 64, a displacement of the measuring arms can occur, as in Fig. 2 is shown. Would work only with a measuring system, for example, the right in Fig. 2 , a displacement of the right measuring arm results in a difference between the distance traveled 70 and the measured distance 72. In the present illustration, the difference is attributed to the tilting (exaggerated) of the center pin 36. Since a second measuring system on the left side in the FIGS. 1 and 2 is provided, the measured path 74 is greater than the actually traveled path 76. In the present case can be compensated by averaging the measured error and thereby the actual traversed path of the center pin 36 are obtained. It is understood that this compensation principle also for the measuring systems for the upper punch 20 and the lower punch 26, as they are in Fig. 1 are shown, can be applied. If only a compensation of the displacement of the measuring arms is desired, the use of two measuring systems, preferably on diametrically opposite sides of the punch or the center pin. However, if a tilting of the press ram or of the center pin is also to be detected, at least three, preferably offset by 120 °, measuring systems of the type described are required in order to obtain a compensation.

Claims (3)

  1. Method for the path-measuring of at least one top and one bottom stamping die (20, 26) of a powder press (10), wherein the top and bottom stamping die (20, 26) are actuated by a hydraulic cylinder and co-operate with a mould of a mould plate, wherein a laterally projecting index arm (40, 42; 48, 50, 56) on the top and the bottom stamping die (20, 26) co-operates with an assigned vertical measuring ruler (44, 46; 52, 54) at a frame (12) for the powder press (10), and the measurement results are transmitted to a machine computer, characterised in that at least two index arms (40, 42; 48, 50, 56) on opposing sides on at least the top and the bottom stamping die (20, 26) co-operate with a measuring ruler (44, 46; 52, 54), and the machine computer compensates an incorrect measurement value on one measuring ruler by the second measurement value on the other measuring ruler.
  2. Path-measuring system according to claim 1, characterised in that at least three measuring systems comprising index arm and measuring ruler are arranged in equal circumferential distance on the top and the bottom stamping die.
  3. Path-measuring system according to claim 1 or 2, characterised in that the arms (56) are guided in a vertical linear guiding (62, 64) and that the guidings (62, 64), measuring rulers (58, 60) and the arms of one measuring system comprising index arm and measuring ruler are arranged in one plane.
EP03005213A 2002-03-20 2003-03-08 Position measurement machine for a powder press Expired - Lifetime EP1346821B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10212315A DE10212315B4 (en) 2002-03-20 2002-03-20 Position measuring system for a powder press
DE10212315 2002-03-20

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EP1346821A2 EP1346821A2 (en) 2003-09-24
EP1346821A3 EP1346821A3 (en) 2004-05-06
EP1346821B1 true EP1346821B1 (en) 2010-01-13

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US (1) US20030180408A1 (en)
EP (1) EP1346821B1 (en)
AT (1) ATE454978T1 (en)
DE (2) DE10212315B4 (en)

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DE102013113665B4 (en) * 2013-12-06 2015-09-03 Fette Compacting Gmbh Press
DE102016120195A1 (en) 2016-10-24 2018-04-26 Dorst Technologies Gmbh & Co. Kg press means

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JPH11179599A (en) * 1997-12-15 1999-07-06 Aida Eng Ltd Slide position controller in servo press
DE19846210A1 (en) * 1998-10-07 2000-04-13 Dorst Masch & Anlagen Press for the production of moldings
DE19919693C2 (en) * 1999-04-30 2001-08-23 Fette Wilhelm Gmbh Method for determining the position of a ram of a powder press
JP2000343283A (en) * 1999-05-31 2000-12-12 Yamada Dobby Co Ltd Device for controlling slide of screw press

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US20030180408A1 (en) 2003-09-25
DE10212315B4 (en) 2004-04-29
ATE454978T1 (en) 2010-01-15
DE10212315A1 (en) 2003-10-16
EP1346821A2 (en) 2003-09-24
EP1346821A3 (en) 2004-05-06
DE50312335D1 (en) 2010-03-04

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