EP0723858B1 - Procédé pour la génération d'un diagramme force-distance des pistons d'une presse rotative à comprimées - Google Patents

Procédé pour la génération d'un diagramme force-distance des pistons d'une presse rotative à comprimées Download PDF

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Publication number
EP0723858B1
EP0723858B1 EP96100687A EP96100687A EP0723858B1 EP 0723858 B1 EP0723858 B1 EP 0723858B1 EP 96100687 A EP96100687 A EP 96100687A EP 96100687 A EP96100687 A EP 96100687A EP 0723858 B1 EP0723858 B1 EP 0723858B1
Authority
EP
European Patent Office
Prior art keywords
displacement
values
press
force
punch
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
EP96100687A
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German (de)
English (en)
Other versions
EP0723858A1 (fr
Inventor
Jürgen Hinzpeter
Ingo Schmidt
Hans-Joachim Pierags
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.)
Fette GmbH
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Wilhelm Fette GmbH
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Publication date
Application filed by Wilhelm Fette GmbH filed Critical Wilhelm Fette GmbH
Publication of EP0723858A1 publication Critical patent/EP0723858A1/fr
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Publication of EP0723858B1 publication Critical patent/EP0723858B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • 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 creating a force-displacement diagram of the ram of a rotary tablet press according to the preamble of the claim 1.
  • the rotor of a rotary tablet press equipped with a number of upper and lower stamps, whereby during a rotor revolution each punch at certain Positions of the circumference (pressing stations) of a vertical Movement and the associated force subject to.
  • an ejector station is considered here to draw.
  • EP 0 431 269 has disclosed such a Tableting machine the maximum pressing forces at the Monitor ram. Monitoring the pressing forces done to identify bugs and bad tablets to be able to sort out in time. The monitoring takes place also to provide evidence of the quality of the manufactured To be able to create tablets continuously.
  • the process is the one with the press rams Die plate in its position constantly via an angle pulse generator supervised.
  • a computer coordinates the specified maximum impulses with the press force values.
  • the Pressure rollers in the press stations are one example Load cell assigned.
  • the centered position of a Die pair defined in the area of a pair of pressure rollers for example the zero point from which the pulses start of the angular pulse generator are counted, whereby accordingly the division of the die plate a certain number of Angular impulses the position of the next pair of dies centered to the pair of pressure rollers. In this way can be used for all pairs of press rams on a tablet press determine the maximum pressing force.
  • the compression characteristic is desirable of molding compounds.
  • the force-displacement diagram of outstanding Importance Physically speaking, the force-displacement diagram describes the quantitative energy curve during tableting.
  • the compressibility is essentially determined by pressure holding time, Granulate state (moisture, particle size distribution), bulk volume, Lubricant, etc.
  • To the tablet properties include tablet mass, disintegration time, drug release, Abrasion etc.
  • the invention is therefore based on the object of a method specify at which with a minimal measurement effort the compression characteristic under production conditions a rotary press can be determined.
  • the course of the Pressing force of at least one ram in angular steps measured and stored in the computer corresponds to 3,600 angular pulses.
  • the theoretical Values for the path of the press ram saved They can be calculated using appropriate geometric relationships will be discussed in more detail below becomes. The decisive factor for this theoretical value the diameter of the pressure roller, the shape of the stamp head and the relative position of these parts to each other.
  • one of the rotational angle positions is in the computer assigned correction table stored, which essential Influencing factors on the actual stamp path, such as the suspension of the tablet press and Hertzian Pressing taken into account. Both the suspension as well the Hertzian pressure are dependent on that of the Pressure roller on the press force applied. It force-dependent correction factors are thus determined, subtract from the theoretical values for the stamp path to determine the actual stamp path.
  • the invention therefore take into account the correction values Dependence of Hertzian pressure on the angular position of the ram.
  • the correction values for Hertzian To calculate the compression and the spring deflection of the machine.
  • the determination of the correction values in the correction table empirically by a selected pair of dies without intermediate molding compound for different Infeed values are moved towards each other and the associated press values can be measured.
  • the rotor 12 of the tablet press 10 in FIG. 1 is included a die plate 14 indicated and a number of dies of the rotor 12 with a pair of dies an upper ram 16 and a lower ram 18 in the area of an upper pressure roller 20 or a lower one Pressure roller 22.
  • the rotor 12 is supported by a shaft 24 driven by an electric motor 26, a drive belt 28 and a transmission 30. Also sits on the shaft 24 an angle pulse generator 32.
  • the holder of the pressure rollers 20, 22 interacts with a load cell 34 or 36, with which the force is measured between the pressure roller and stamp acts when the stamp 16, 18 between the Drive pressure rollers 20, 22 along.
  • the preliminary or main pressing of a molding compound in the Die plate 14 for forming a tablet or the like As is well known here the preliminary or main pressing of a molding compound in the Die plate 14 for forming a tablet or the like.
  • FIG. 2 is the force-displacement diagram of a pair of press rams, for example the ram 16 and 18, during the Movement between the pressure rollers 20 and 22 shown.
  • arrow 38 is the rising and with arrow 40 the falling Known branch of the diagram.
  • the press material and the springback behavior forms itself, as if through the surface indicated in the diagram.
  • Fig. 3 it is indicated how the angle pulse generator 32 with the rotation of the rotor 12 generates an angular pulse chain, for example one pulse per 0.1 ° revolution. Moreover it generates an initial impulse through the central Position of a pair of dies with respect to a pair of pressure rollers is defined.
  • the pulses arrive at a pulse evaluation device 42 and from there to an analog-to-digital converter 44.
  • FIG. 3 is also shown how the force sensor 34 via a Measuring amplifier 46 also with the analog-digital converter 44 is connected. Its output goes to a machine computer 48.
  • An operating computer is connected to the machine computer 48 50 connected, with the to be described later How the force-displacement diagram of Fig. 2 is created.
  • Fig. 4 it can be seen that the stamp 16 covers a vertical path s during its horizontal movement relative to the stationary pressure roller 20.
  • pressing force values are determined, which are assigned to individual angular steps by triggering the Ahalog digital converter 44 through angular steps of the angular pulse generator 32 and stored in the computer.
  • the course of the force during the path s is indicated at 52 in FIG. 4.
  • To create the force-displacement diagram it is also necessary to determine the actual path of both stamps belonging to a press station during their vertical movement.
  • the actual path is made up of the geometric value Y and the values Y 2 and Y 3 used for the correction.
  • the vertical movement of a Stamp pair are calculated.
  • the angles of rotation are preferably selected in 0.1 ° steps according to the pulse interval of the angular encoder 32.
  • this overall theoretical path must be corrected the total suspension of the tablet press and around Hertzian surface pressure between stamp head 54 of each stamp and pressure roller 20 and between the stamp head of stamp 18 and the pressure wave 22.
  • r a represents the outer diameter of the stamp head and r s represents the inner diameter of the curved outer region of the stamp head (mirror surface).
  • stamp head 54 of the stamp 16 touches the pressure roller 20 with a mirror surface, which means a line contact.
  • the pressing force is shown as for the above range.
  • the factor x can only be done experimentally because of the complex view for every type of machine and every possible tooling be determined.
  • the actual total stamp path for area 1 is hence the geometric value given above minus the flattening in area 1 minus the spring deflection.
  • a pair of measuring stamps is installed in the tablet press, that is moved directly onto one another without molding compound.
  • this pair of measuring stamps by adjusting the web height (for example in 0.1 mm steps) different Force-angle curves are generated, as shown in FIG. 7.
  • Fig. 7 means w the delivery of the pressure rollers. It understands that the maxima of the forces with increasing w are larger. Then the maxima are shown in a force-displacement correction diagram 8 entered. With the help of 8 can correct the theoretical calculated total can be taken. In the embodiment 3 this is done in the form of a Table of values. The theoretical are in the operating computer Press stamp paths stored, which result from the above Calculation result. In addition, are in the operating computer 50 the values for the correction table according to the diagram 8 stored so that at a predetermined Force a given correction value from the theoretical Stamp path is subtracted.
  • the correction described so far is still not sufficient, because it is for Hertzian pressure only correct in the area of the maximum. Rather, the Correction value of a further optimization described above be subjected.
  • the pressure roller 20 touches the stamp head 54 in a line, which corresponds to the mirror diameter of the stamp head. Before and after this line is getting shorter and shorter and then turns into a point touch.
  • Corresponding is also the elastic penetration depth of the pressure roller in the stamp head different. Therefore, with help of the computer not only the force maxima, but also the respective force values for the 0.1 ° steps for the different Infeed values recorded as shown in Fig. 9 is shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Control Of Presses (AREA)
  • Presses And Accessory Devices Thereof (AREA)

Claims (4)

  1. Procédé pour la génération d'un diagramme force/distance des paires de pistons de vérin d'une presse rotative à comprimés, dans lequel la position des pistons de vérin dans le sens de la rotation, qui sont actionnés au moyen d'un rouleau presseur à un poste de pressage, est déterminée par un codeur angulaire et convertie à l'aide d'un ordinateur et rapportée à la force de compression mesurée sur le piston, caractérisé par les étapes de procédé suivantes :
    A chaque incrément angulaire du codeur angulaire, la force de compression au niveau des pistons de vérin d'au moins une paire de pistons de vérin est mesurée et les valeurs de force de compression sont mémorisées dans l'ordinateur.
    Pour chaque incrément angulaire du codeur angulaire, les valeurs verticales théoriques respectives de la distance de la paire de pistons de vérin sont calculées d'après la géométrie du rouleau presseur, de la tête de piston de vérin et de la situation relative de ceux-ci, et mémorisées dans l'ordinateur.
    Dans l'ordinateur on mémorise en outre une table de correction force/distance qui représente l'influence de la pression superficielle hertzienne entre la tête de piston de vérin et le rouleau presseur ainsi que du comportement de détente de la presse rotative sur la distance verticale réelle de la paire de pistons de vérin en fonction de la force ; et
    L'ordinateur réduit la valeur verticale théorique de la distance de la paire de pistons aux incréments angulaires individuels d'une valeur de correction correspondante provenant de la table de correction.
  2. Procédé selon la revendication 1, caractérisé en ce que les valeurs de correction représentent aussi la relation entre la pression hertzienne et la position angulaire du piston de vérin.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les valeurs de correction de la table de correction sont déterminées de façon empirique en rapprochant pour des valeurs d'approche différentes une paire sélectionnée de pistons de vérin sans matière à comprimer entre les deux.
  4. Appareil de mesure et ordinateur pour vérifier les comprimés fabriqués sur une presse rotative, caractérisés en ce que pour la constitution des affectations distance/ force de compression pour les pistons de vérin, les éléments suivants sont présents au moins pour une paire de pistons :
    a) un codeur angulaire pour déterminer la position angulaire courante de la table tournante et donc de la paire de pistons de vérin,
    b) une unité de mesure de la force de compression avec laquelle les valeurs de la force de compression d'au moins une paire de pistons sont déterminées, et pour chaque incrément angulaire une valeur de force de compression est transmise à l'ordinateur,
    c) un algorithme dans l'ordinateur, constitué en fonction des relations géométriques de la presse à comprimés et à l'aide duquel les valeurs théoriques de la distance de la paire de pistons de vérin dans la matrice peuvent être calculées à partir des positions angulaires,
    d) une fonction de correction alimentée dans l'ordinateur pour convertir les valeurs de distance théoriques des pistons en valeurs de distance réelles en tenant compte de la pression superficielle hertzienne entre la tête de piston de vérin et le rouleau presseur ainsi que du comportement de détente de la presse rotative.
EP96100687A 1995-01-28 1996-01-18 Procédé pour la génération d'un diagramme force-distance des pistons d'une presse rotative à comprimées Expired - Lifetime EP0723858B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19502596 1995-01-28
DE19502596A DE19502596C2 (de) 1995-01-28 1995-01-28 Meßgerät und Rechner zur Überprüfung der auf einer Rundläuferpresse hergestellten Tabletten der laufenden Produktion

Publications (2)

Publication Number Publication Date
EP0723858A1 EP0723858A1 (fr) 1996-07-31
EP0723858B1 true EP0723858B1 (fr) 1999-04-07

Family

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Family Applications (1)

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EP96100687A Expired - Lifetime EP0723858B1 (fr) 1995-01-28 1996-01-18 Procédé pour la génération d'un diagramme force-distance des pistons d'une presse rotative à comprimées

Country Status (4)

Country Link
US (1) US5699273A (fr)
EP (1) EP0723858B1 (fr)
JP (1) JP3713639B2 (fr)
DE (2) DE19502596C2 (fr)

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DE19646536C1 (de) * 1996-10-30 1998-01-29 Korsch Pressen Gmbh Verfahren zur Herstellung von Kopfflächen von mit zylindrischen Druckrollen zusammenwirkenden Stempeln für Rundlaufpressen und nach diesem Verfahren hergestellte Stempel
US5996404A (en) * 1998-08-24 1999-12-07 Westvaco Corporation On-line dense paste rheological testing apparatus and method
DE19911294C1 (de) * 1999-03-13 2000-06-15 Fette Wilhelm Gmbh Einstellverfahren für eine Rundläufertablettenpresse mit einem Winkelimpulsgeber zur Ermittlung des Preßkraftverlaufs an den einzelnen Stempeln in mindestens einer Preßstation
DE19958999A1 (de) * 1999-12-08 2001-04-26 Henkel Kgaa Verfahren und Vorrichtung zur Regelung von Tablettenpressen
DE10142772C2 (de) * 2001-08-31 2003-09-25 Fette Wilhelm Gmbh Verfahren zur Herstellung von Pressteilen in einer Pulverpresse
US6865498B2 (en) * 2001-11-30 2005-03-08 Thermwood Corporation System for calibrating the axes on a computer numeric controlled machining system and method thereof
DE10212959A1 (de) * 2002-03-22 2003-10-16 Wolfram Minke Vorrichtung zur Herstellung von Preßlingen
ES2310429B1 (es) * 2002-05-14 2009-11-11 Fundacion Robotiker Procedimiento de fabricacion de troqueles.
WO2003095121A1 (fr) * 2002-05-14 2003-11-20 Fundacion Robotiker Procede de fabrication d'emporte-pieces
EP1445093B1 (fr) * 2003-02-10 2005-05-11 Korsch AG Méthode et dispositif pour le contrôle d'une presse pour comprimés à table rotative
DE102005051567B4 (de) * 2005-10-20 2010-01-07 Korsch Ag Rundläufer-Tablettiermaschine sowie Verfahren und Vorrichtung zur Wegmessung eines Stempels einer Rundläufer-Tablettiermaschine
DE102008015820B4 (de) 2008-03-27 2013-02-28 Fette Compacting Gmbh Vorrichtung und Verfahren zur Messung der vertikalen Position von Ober- und Unterstempeln einer Rundläufer-Tablettenpresse
DE102008020748B4 (de) * 2008-04-23 2010-12-30 Fette Gmbh Stempel für eine Rundläuferpresse
DE102009031367B3 (de) * 2009-07-02 2010-09-02 Fette Gmbh Pressstempel für eine Rundläuferpresse
DE102013202975B4 (de) * 2013-02-22 2015-02-05 Korsch Ag Einzelsortiervorrichtung zur sortierung von tabletten, system mit einer solchen einzelsortiervorrichtung und mit einer tablettiervorrichtung und verfahren zur überprüfung einer einzelsortiervorrichtung
JP7406627B2 (ja) 2019-09-27 2023-12-27 コルシュ アーゲー プレスパンチに取り付けられた測定装置によって錠剤プレス機を好ましくは継続的な動作中に監視する装置及び方法
DE102022131493A1 (de) 2022-11-29 2024-05-29 Fette Compacting Gmbh Verfahren zum Bewerten des Zustands von Pressstempeln einer Rundläuferpresse sowie Rundläuferpresse

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Also Published As

Publication number Publication date
DE19502596A1 (de) 1996-08-14
DE19502596C2 (de) 1997-08-28
US5699273A (en) 1997-12-16
JP3713639B2 (ja) 2005-11-09
EP0723858A1 (fr) 1996-07-31
DE59601573D1 (de) 1999-05-12
JPH08276127A (ja) 1996-10-22

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