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EP2269813B1 - Press punch for a rotary press - Google Patents

Press punch for a rotary press Download PDF

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Publication number
EP2269813B1
EP2269813B1 EP10006112.6A EP10006112A EP2269813B1 EP 2269813 B1 EP2269813 B1 EP 2269813B1 EP 10006112 A EP10006112 A EP 10006112A EP 2269813 B1 EP2269813 B1 EP 2269813B1
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EP
European Patent Office
Prior art keywords
press
punch
mirror surface
cylinder surface
transition region
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EP10006112.6A
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German (de)
French (fr)
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EP2269813A2 (en
EP2269813A3 (en
Inventor
Friedrich Meissner
Stefan Lüdemann
Jan Naeve
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Fette Compacting GmbH
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Fette GmbH
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Classifications

    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams

Definitions

  • the invention relates to a press stamp for a rotary press, with a shaft, a stamp head arranged at one end of the shaft and a pressing area arranged at the other end of the shaft, the stamp head having an upper mirror surface, an outer cylinder surface and a curved transition area between the mirror surface and the cylinder surface.
  • Rotary presses for the production of tablets and similar compacts have lower and upper punches which interact with die bores in a die disc in order to process filled powder into compacts.
  • the molds with which the punches interact are referred to as dies, which are mounted as separate sleeve-like inserts in bores in the die table.
  • Pressing rams are used in rotary presses, which have a shank with a ram head at one end and a pressing area at the other end, which interacts with the die bores in order to press the powder.
  • the upper side of the punch head has a mirror surface that is usually flat and that interacts with the pressure rollers of the rotary press. The diameter of the mirror surface determines the pressure holding time of the press ram, ie at a given speed the time in which the press ram interacts with the powder to be pressed.
  • the punch heads also have a cylindrical surface and a usually rounded transition area arranged between the cylindrical surface and the mirror surface.
  • Known punch heads are designed with geometrically defined radii and straight lines. On their underside, the punch heads merge into the shank in a conical section, for example.
  • the geometric design and dimensions of punch heads for rotary presses are standardized by DIN ISO 18084:2006-09.
  • a stamp for a tablet press is known with the features of the preamble of claim 1, including a mirror surface and a force-transmitting surface adjoining the mirror surface.
  • the force transmission surface can be designed essentially in the shape of a lens.
  • Other stamps are known from JP H05 84277 A and EP 2 111 972 A .
  • the invention is therefore based on the object of providing a press ram of the type mentioned at the outset, in which the noise emissions during operation are further reduced and wear of the ram heads and the pressure rollers is further reduced.
  • the invention solves the problem for a press stamp of the type mentioned in that the mirror surface and the transition area form a three-dimensional surface whose course in at least one radial direction is described by a mathematical function whose second derivative is continuous.
  • the mirror surface can be flat and circular in plan view.
  • the transition area forms a curved surface of the stamp head, with the transition area opening directly into the mirror surface.
  • the height of the punch head decreases in particular continuously from the mirror surface to the cylinder surface.
  • the profile of the upper side of the punch head is described in at least one radial direction by a mathematical function that is continuous in the second derivative.
  • the at least one radial direction can in particular be the direction in which the pressure rollers act on the punch heads. According to the invention, therefore, no jumps in radii occur in the transition area and the mirror surface and in particular in the area where the transition area opens into the mirror surface.
  • the pressure rollers therefore roll more evenly on the punch heads. As a result, the contact and thus the introduction of force by the pressure rollers acting on the stamp heads are evened out and the wear on the stamp head and the pressure rollers is reduced. In addition, there are fewer vibrations in the machine frame, so that noise emissions are reduced.
  • the mathematical function can be a polynomial function, for example, which can assume a constant value in the area of the mirror surface.
  • the diameter of the head can be larger than 25mm. However, smaller punch head diameters are also possible.
  • the rotary press can in particular be a tablet press. In order to further equalize the interaction of the punch head with the pressure rollers, the course of the three-dimensional surface can be described in any radial direction by the mathematical function that is continuous in the second derivative.
  • the punch head can also be rotationally symmetrical. This enables the press ram to be installed in the rotary press in any rotational orientation.
  • the radius of curvature of the three-dimensional surface can steadily decrease in the radial direction from the mirror surface to the cylindrical surface.
  • the radius therefore decreases in the radial direction, starting from the center of the mirror surface.
  • the radius is infinite if the mirror surface is flat.
  • a rounded area with at least one predetermined radius can be provided between the transition area and the cylinder surface.
  • at least one edge can also be provided between the transition area and the cylinder surface.
  • the punch head can preferably transition from the cylindrical surface into the shaft in a convex manner, in particular spherically.
  • a spherical design of the underside of the punch head reduces wear in the phase in which the punch is pulled out of the respective die bore.
  • the spherical shape increases the contact area with the respective cams.
  • the invention also relates to a rotary press with a rotor which has an upper and a lower punch guide, in each of which a large number of press punches according to the invention are guided, which interact with bores in a die plate arranged between the upper and lower punch guides, the punches in guide bores of the Punch guides are axially movable and their punch heads interact for pressing powdered material in the die holes with pressure rollers of the rotary press.
  • a section of a press die 10 according to the invention is shown in its side view.
  • the upper end of the shank 12 with the punch head 14 of the press punch 10 is shown.
  • the punch head 14 is rotationally symmetrical, the axis of rotational symmetry being represented by the reference numeral 15 in dashed lines.
  • the punch head 14 has an upper flat mirror surface 16 that is circular in plan view. It also has an outer cylindrical surface 18. There is a curved transition region 20 between the cylindrical surface 18 and the mirror surface 16.
  • the mirror surface 16 and the transition region 20 form a three-dimensional curved surface, the course of which is described in any radial direction of the punch head 14 by a mathematical function that is continuous in the second derivative.
  • the radius of curvature of the three-dimensional surface steadily decreases outwards in the radial direction, starting from the center of the mirror surface 16 .
  • the height of the punch head 14 also decreases steadily starting from the mirror surface 16 to the cylinder surface 18 .
  • the function 30 can then be defined as constant, for example, so that it maps the plane mirror surface. It should be noted that in 2 the coordinate origin was placed on the lower edge of the three-dimensional surface formed by the transition region 20 and the mirror surface 16. The y-axis thus represents the height of the punch head 14.
  • the in 2 The function 30 shown correspondingly spans the three-dimensional surface formed by the transition region 20 and the mirror surface 16 during a rotation about a suitable axis.
  • the first derivative f(x) of the function f(x) is also shown in dash-dotted lines at reference number 32 .
  • the second derivative f′′(x) of the function f(x) is shown dashed. It can be seen that the second derivative f′(x) of the function f(x) is continuous.
  • the press ram according to the invention shown reduces both the noise emissions occurring on contact with the pressure rollers and the wear of the ram head and the pressure rollers.
  • the very flat transition of the transition area 20 in the mirror surface 16 to an increased pressure holding time of the stamp so that even difficult-to-press materials can be processed without any problems.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Powder Metallurgy (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)

Description

Die Erfindung betrifft einen Pressstempel für eine Rundläuferpresse, mit einem Schaft, einem an einem Schaftende angeordneten Stempelkopf und einem am anderen Schaftende angeordneten Pressbereich, wobei der Stempelkopf eine obere Spiegelfläche, eine äußere Zylinderfläche und einen gekrümmten Übergangsbereich zwischen der Spiegelfläche und der Zylinderfläche aufweist. Rundläuferpressen zur Herstellung von Tabletten und ähnlichen Presslingen weisen Unter- und Oberstempel auf, die mit Matrizenbohrungen in einer Matrizenscheibe zusammenwirken, um eingefülltes Pulver zu Presslingen zu verarbeiten. Die Formen, mit denen die Stempel zusammenwirken, werden als Matrizen bezeichnet, die als separate hülsenartige Einsätze in Bohrungen der Matrizenscheibe befestigt werden. In den Rundläuferpressen kommen Pressstempel zum Einsatz, die einen Schaft aufweisen, an dessen einem Ende ein Stempelkopf und an dessen anderem Ende ein Pressbereich angeordnet ist, der mit den Matrizenbohrungen zusammenwirkt, um das Pulver zu verpressen. Der Stempelkopf weist an seiner Oberseite eine üblicherweise plane Spiegelfläche auf, die mit Druckrollen der Rundläuferpresse zusammenwirkt. Der Durchmesser der Spiegelfläche bestimmt die Druckhaltezeit der Pressstempel, d.h. bei gegebener Geschwindigkeit die Zeit, in der die Pressstempel mit dem zu verpressenden Pulver zusammenwirken. Die Stempelköpfe weisen außerdem eine Zylinderfläche auf und einen zwischen der Zylinderfläche und der Spiegelfläche angeordneten, üblicherweise gerundeten Übergangsbereich. Bekannte Stempelköpfe sind mit geometrisch definierten Radien und Geraden konstruiert. An ihrer Unterseite gehen die Stempelköpfe in einem beispielsweise konischen Abschnitt in den Schaft über. Die geometrische Ausbildung und Abmessung von Stempelköpfen für Rundläuferpressen sind normiert durch die DIN ISO 18084:2006-09.The invention relates to a press stamp for a rotary press, with a shaft, a stamp head arranged at one end of the shaft and a pressing area arranged at the other end of the shaft, the stamp head having an upper mirror surface, an outer cylinder surface and a curved transition area between the mirror surface and the cylinder surface. Rotary presses for the production of tablets and similar compacts have lower and upper punches which interact with die bores in a die disc in order to process filled powder into compacts. The molds with which the punches interact are referred to as dies, which are mounted as separate sleeve-like inserts in bores in the die table. Pressing rams are used in rotary presses, which have a shank with a ram head at one end and a pressing area at the other end, which interacts with the die bores in order to press the powder. The upper side of the punch head has a mirror surface that is usually flat and that interacts with the pressure rollers of the rotary press. The diameter of the mirror surface determines the pressure holding time of the press ram, ie at a given speed the time in which the press ram interacts with the powder to be pressed. The punch heads also have a cylindrical surface and a usually rounded transition area arranged between the cylindrical surface and the mirror surface. Known punch heads are designed with geometrically defined radii and straight lines. On their underside, the punch heads merge into the shank in a conical section, for example. The geometric design and dimensions of punch heads for rotary presses are standardized by DIN ISO 18084:2006-09.

Bei bekannten Stempelköpfen kommt es jedoch im Zuge der Wechselwirkung zwischen den Druckrollen und den Stempelköpfen zu einer erheblichen Geräuschemission und einem Verschleiß an Stempel und Druckrolle. Insbesondere der Stempelkopf verschleißt dabei verstärkt am Übergang zur Spiegelfläche. Gerade bei kleineren Stempelformaten sind darüber hinaus beim Stand der Technik die Druckhaltezeiten verhältnismäßig gering, so dass schwierig zu verpressende Materialien problematisch sein können. Schließlich kommt es beim Stand der Technik zu erhöhten Vibrationen des Maschinengestells unter bestimmten Betriebsbedingungen, was ebenfalls zu unerwünschten Geräuschemissionen führt. In DE 10 2007 043 582 B3 wird vorgeschlagen, Stempelköpfe an gegenüberliegenden Seiten mit Abflachungen zu versehen, so dass diese mit geringerem Abstand zueinander positioniert werden können. Dies verbessert die Wechselwirkung mit den Druckrollen.In the case of known stamp heads, however, the interaction between the pressure rollers and the stamp heads results in considerable noise emissions and wear on the stamp and pressure roller. The stamp head in particular wears out more at the transition to the mirror surface. Especially with smaller stamp formats, the pressure holding times are relatively short in the prior art, so that materials that are difficult to compress can be problematic. Finally, in the prior art, increased vibrations of the machine frame occur under certain operating conditions, which also leads to undesirable noise emissions. In DE 10 2007 043 582 B3 it is proposed to provide punch heads on opposite sides with flat areas so that they can be positioned at a smaller distance from one another. This improves interaction with the pressure rollers.

Aus DE 81 118 60 U1 ist ein Stempel für eine Tablettenpresse bekannt mit den Merkmalen des Oberbegriffs des Anspruchs 1, u.a. einer Spiegelfläche und einer an die Spiegelfläche angrenzenden Kraftübertragungsfläche. Die Kraftübertragungsfläche kann im Wesentlichen linsenförmig ausgeführt sein. Weitere Stempel sind bekannt aus JP H05 84277 A und EP 2 111 972 A .Out of DE 81 118 60 U1 a stamp for a tablet press is known with the features of the preamble of claim 1, including a mirror surface and a force-transmitting surface adjoining the mirror surface. The force transmission surface can be designed essentially in the shape of a lens. Other stamps are known from JP H05 84277 A and EP 2 111 972 A .

Ausgehend von dem erläuterten Stand der Technik liegt der Erfindung daher die Aufgabe zugrunde, einen Pressstempel der eingangs genannten Art bereit zu stellen, bei dem die Geräuschemissionen im Betrieb weiter reduziert und ein Verschleiß der Stempelköpfe und der Druckrollen weiter verringert ist.Proceeding from the prior art explained, the invention is therefore based on the object of providing a press ram of the type mentioned at the outset, in which the noise emissions during operation are further reduced and wear of the ram heads and the pressure rollers is further reduced.

Die Erfindung löst dieses Problem durch den Gegenstand von Anspruch 1. Vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen, der Beschreibung und den Figuren.The invention solves this problem by the subject matter of claim 1. Advantageous configurations can be found in the dependent claims, the description and the figures.

Für einen Pressstempel der eingangs genannten Art löst die Erfindung die Aufgabe dadurch, dass die Spiegelfläche und der Übergangsbereich eine dreidimensionale Fläche bilden, deren Verlauf in zumindest einer radialen Richtung durch eine mathematische Funktion beschrieben ist, deren zweite Ableitung stetig ist. Die Spiegelfläche kann dabei eben sein und in Draufsicht kreisförmig ausgebildet sein.The invention solves the problem for a press stamp of the type mentioned in that the mirror surface and the transition area form a three-dimensional surface whose course in at least one radial direction is described by a mathematical function whose second derivative is continuous. The mirror surface can be flat and circular in plan view.

Sie bildet gemeinsam mit dem Übergangsbereich eine gekrümmte Oberfläche des Stempelkopfes, wobei der Übergangsbereich direkt in die Spiegelfläche mündet. Die Höhe des Stempelkopfes nimmt von der Spiegelfläche zu der Zylinderfläche insbesondere stetig ab. Erfindungsgemäß ist erkannt worden, dass die beim Stand der Technik auftretenden Geräuschemissionen und der Verschleiß durch eine ungünstige, insbesondere ungleichmäßige Wechselwirkung zwischen den Druckrollen und den Stempelköpfen verursacht werden. Der Grund hierfür ist, dass der Übergangsbereich selbst und insbesondere seine Mündung in die Spiegelfläche sprunghafte Radiusänderungen aufweist. Der Übergang von den Außenradien des Übergangsbereichs in die Spiegelfläche ist daher ungleichmäßig. Dadurch kommt es zu einem ebenfalls ungleichmäßigen Kontakt mit den Druckrollen und damit hohen Geräuschemissionen und Verschleiß.Together with the transition area, it forms a curved surface of the stamp head, with the transition area opening directly into the mirror surface. The height of the punch head decreases in particular continuously from the mirror surface to the cylinder surface. According to the invention, it has been recognized that the noise emissions and wear that occur in the prior art are caused by an unfavorable, in particular uneven, interaction between the pressure rollers and the punch heads. The reason for this is that the transition region itself, and in particular its opening into the mirror surface, has abrupt changes in radius. The transition from the outer radii of the transition area to the mirror surface is therefore uneven. This also leads to uneven contact with the pressure rollers and thus high noise emissions and wear.

Erfindungsgemäß ist der Verlauf der Oberseite des Stempelkopfes in zumindest einer radialen Richtung durch eine in zweiter Ableitung stetige mathematische Funktion beschrieben. Die mindestens eine radiale Richtung kann insbesondere die Richtung sein, in der die Druckrollen an den Stempelköpfen angreifen. Es treten in dem Übergangsbereich und der Spiegelfläche und insbesondere im Bereich der Mündung des Übergangsbereichs in die Spiegelfläche erfindungsgemäß also keine Radiensprünge auf. Die Druckrollen wälzen daher gleichmäßiger auf den Stempelköpfen ab. Dadurch werden der Kontakt und damit die Krafteinleitung durch die an den Stempelköpfen angreifenden Druckrollen vergleichmäßigt und der Verschleiß an dem Stempelkopf und den Druckrollen verringert. Außerdem treten weniger Vibrationen des Maschinengestells auf, so dass Geräuschemissionen reduziert sind. Durch den sehr flachen Kurvenübergang des Übergangsbereichs in die Spiegelfläche wird durch die angreifenden Druckrollen auch bereits dicht neben der Spiegelfläche eine hohe Presskraft erreicht. Dies erhöht die effektive Druckhaltezeit der Stempel, wodurch erfindungsgemäß auch schwierig zu verpressende Materialien zuverlässig verarbeitet werden können.According to the invention, the profile of the upper side of the punch head is described in at least one radial direction by a mathematical function that is continuous in the second derivative. The at least one radial direction can in particular be the direction in which the pressure rollers act on the punch heads. According to the invention, therefore, no jumps in radii occur in the transition area and the mirror surface and in particular in the area where the transition area opens into the mirror surface. The pressure rollers therefore roll more evenly on the punch heads. As a result, the contact and thus the introduction of force by the pressure rollers acting on the stamp heads are evened out and the wear on the stamp head and the pressure rollers is reduced. In addition, there are fewer vibrations in the machine frame, so that noise emissions are reduced. Due to the very flat curve transition of the transition area into the mirror surface, a high pressing force is achieved by the attacking pressure rollers even right next to the mirror surface. This increases the effective Pressure holding time of the stamps, which means that materials which are difficult to compress can also be reliably processed according to the invention.

Die mathematische Funktion kann beispielsweise eine Polynom-Funktion sein, die im Bereich der Spiegelfläche einen konstanten Wert annehmen kann. Der Durchmesser des Kopfes kann größer als 25 mm sein. Es sind jedoch auch kleinere Stempelkopfdurchmesser möglich. Bei der Rundläuferpresse kann es sich insbesondere um eine Tablettenpresse handeln. Um die Wechselwirkung des Stempelkopfes mit den Druckrollen weiter zu vergleichmäßigen, kann der Verlauf der dreidimensionalen Fläche in einer beliebigen radialen Richtung durch die in zweiter Ableitung stetige mathematische Funktion beschrieben sein. Der Stempelkopf kann außerdem rotationssymmetrisch sein. Dies ermöglicht einen Einbau des Pressstempels in die Rundläuferpresse in beliebiger Drehorientierung.The mathematical function can be a polynomial function, for example, which can assume a constant value in the area of the mirror surface. The diameter of the head can be larger than 25mm. However, smaller punch head diameters are also possible. The rotary press can in particular be a tablet press. In order to further equalize the interaction of the punch head with the pressure rollers, the course of the three-dimensional surface can be described in any radial direction by the mathematical function that is continuous in the second derivative. The punch head can also be rotationally symmetrical. This enables the press ram to be installed in the rotary press in any rotational orientation.

Nach einer weiteren Ausgestaltung kann der Krümmungsradius der dreidimensionalen Fläche in radialer Richtung von der Spiegelfläche zu der Zylinderfläche stetig abnehmen. Der Radius nimmt also ausgehend von dem Zentrum der Spiegelfläche in radialer Richtung ab. Im Bereich der Spiegelfläche ist der Radius bei planer Spiegelfläche unendlich. Eine solche Ausgestaltung sichert einen besonders gleichmäßigen Kontakt mit den Druckrollen und damit einem besonders gleichmäßigen Druckaufbau, so dass Geräuschemissionen und Verschleiß weiter minimiert werden.According to a further embodiment, the radius of curvature of the three-dimensional surface can steadily decrease in the radial direction from the mirror surface to the cylindrical surface. The radius therefore decreases in the radial direction, starting from the center of the mirror surface. In the area of the mirror surface, the radius is infinite if the mirror surface is flat. Such an embodiment ensures a particularly even contact with the pressure rollers and thus a particularly even pressure build-up, so that noise emissions and wear are further minimized.

Gemäß einer weiteren Ausgestaltung kann zwischen dem Übergangsbereich und der Zylinderfläche ein mit mindestens einem vorgegebenen Radius abgerundeter Bereich vorgesehen sein. Nach einer alternativen Ausgestaltung kann zwischen dem Übergangsbereich und der Zylinderfläche auch mindestens eine Kante vorgesehen sein. Bei diesen Ausgestaltungen ist der Übergang von Übergangsbereich in die Zylinderfläche also nicht in zweiter Ableitung stetig. Von größerer Bedeutung bezüglich der Wechselwirkung mit den Rollen ist nämlich der Übergang in die Spiegelflächen, da dort die Druckrollen angreifen. Um jedoch auch bei mit größerem Abstand zueinander verbauten Pressstempeln die Wechselwirkung mit den Druckrollen zu vergleichmäßigen, kann die durch die in zweiter Ableitung stetige mathematische Funktion beschriebene dreidimensionale Fläche die Zylinderfläche auch einschließen. In diesem Fall mündet der Übergangsbereich also direkt sowohl in die Spiegelfläche als auch in die Zylinderfläche. Zwischen der Spiegelfläche und der Zylinderfläche ist also nur der Übergangsbereich vorgesehen. Der Stempelkopf kann vorzugsweise konvex, insbesondere kugelförmig, von der Zylinderfläche in den Schaft übergehen. Eine kugelförmige Ausbildung der Stempelkopfunterseite verringert den Verschleiß in der Phase, in der der Stempel aus der jeweiligen Matrizenbohrung herausgezogen wird. Insbesondere wird durch die Kugelform die Kontaktfläche zu den jeweiligen Steuerkurven vergrößert.According to a further embodiment, a rounded area with at least one predetermined radius can be provided between the transition area and the cylinder surface. According to an alternative embodiment, at least one edge can also be provided between the transition area and the cylinder surface. In these configurations, the transition from the transition region into the Cylindrical surface is therefore not continuous in the second derivative. The transition into the mirror surfaces is of greater importance with regard to the interaction with the rollers, since the pressure rollers act there. However, in order to even out the interaction with the pressure rollers in the case of press rams installed at a greater distance from one another, the three-dimensional surface described by the continuous mathematical function in the second derivation can also include the cylinder surface. In this case, the transition area thus opens directly both into the mirror surface and into the cylinder surface. Only the transition area is therefore provided between the mirror surface and the cylinder surface. The punch head can preferably transition from the cylindrical surface into the shaft in a convex manner, in particular spherically. A spherical design of the underside of the punch head reduces wear in the phase in which the punch is pulled out of the respective die bore. In particular, the spherical shape increases the contact area with the respective cams.

Die Erfindung betrifft außerdem eine Rundläuferpresse mit einem Rotor, der eine obere und eine untere Stempelführung aufweist, in denen jeweils eine Vielzahl von erfindungsgemäßen Pressstempeln geführt sind, die mit Bohrungen einer zwischen der Ober- und Unterstempelfuhrung angeordneten Matrizenscheibe zusammenwirken, wobei die Stempel in Führungsbohrungen der Stempelführungen axial bewegbar sind und ihre Stempelköpfe zum Verpressen von pulverförmigem Material in den Matrizenbohrungen mit Druckrollen der Rundläuferpresse zusammenwirken.The invention also relates to a rotary press with a rotor which has an upper and a lower punch guide, in each of which a large number of press punches according to the invention are guided, which interact with bores in a die plate arranged between the upper and lower punch guides, the punches in guide bores of the Punch guides are axially movable and their punch heads interact for pressing powdered material in the die holes with pressure rollers of the rotary press.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert. Es zeigen schematisch:

Fig. 1
einen erfindungsgemäßen Pressstempel in einer ausschnittsweisen Seitenansicht, und
Fig. 2
ein Diagramm zur Veranschaulichung mathematischer Funktionen.
An embodiment of the invention is explained in more detail below with reference to a drawing. They show schematically:
1
a ram according to the invention in a partial side view, and
2
a diagram to illustrate mathematical functions.

Soweit nichts anderes angegeben ist, bezeichnen in den Figuren gleiche Bezugszeichen gleiche Gegenstände. In Fig. 1 ist ein Ausschnitt eines erfindungsgemäßen Pressstempels 10 in seiner Seitenansicht dargestellt. Von dem Pressstempel 10 ist das obere Ende des Schafts 12 mit dem Stempelkopf 14 gezeigt. An dem nicht dargestellten gegenüberliegenden Ende des Schafts 12 ist ein an sich bekannter Pressbereich vorgesehen, der beim Einbau des Pressstempels 10 in eine Rundläufertablettenpresse mit geeigneten Matrizenbohrungen zum Verpressen von pulverförmigem Tablettenmaterial zusammenwirkt. Der Stempelkopf 14 ist rotationssymmetrisch, wobei die Rotationssymmetrieachse bei dem Bezugszeichen 15 gestrichelt dargestellt ist. Der Stempelkopf 14 besitzt eine obere plane und in Draufsicht kreisförmige Spiegelfläche 16. Er besitzt außerdem eine äußere Zylinderfläche 18. Zwischen der Zylinderfläche 18 und der Spiegelfläche 16 befindet sich ein gekrümmter Übergangsbereich 20. In dem dargestellten Beispiel bilden die Spiegelfläche 16 und der Übergangsbereich 20 eine dreidimensionale gekrümmte Fläche, deren Verlauf in einer beliebigen radialen Richtung des Stempelkopfes 14 durch eine in zweiter Ableitung stetige mathematische Funktion beschrieben ist. Insbesondere nimmt in dem gezeigten Beispiel der Krümmungsradius der dreidimensionalen Fläche ausgehend von dem Zentrum der Spiegelfläche 16 in radialer Richtung nach außen stetig ab. Die Höhe des Stempelkopfes 14 nimmt ebenfalls ausgehend von der Spiegelfäche 16 zu der Zylinderfläche 18 stetig ab. Zwischen dem Übergangsbereich 20 und der Zylinderfläche 18 ist ein mit einem vorgegebenen Radius abgerundeter Bereich 22 vorgesehen. An der Unterseite des Stempelkopfes 14 ist zwischen der Zylinderfläche 18 und dem Schaft 12 ein konvexer, in dem Beispiel kugelförmiger, Übergangsbereich 24 vorgesehen, der über einen ersten gerundeten Bereich 26 in die Zylinderfläche 18 übergeht und über einen zweiten gerundeten Bereich 28 in den Schaft übergeht.Unless otherwise stated, the same reference symbols designate the same objects in the figures. In 1 a section of a press die 10 according to the invention is shown in its side view. The upper end of the shank 12 with the punch head 14 of the press punch 10 is shown. At the opposite end of the shaft 12, which is not shown, there is a known pressing area which, when the pressing punch 10 is installed in a rotary tablet press, interacts with suitable die bores for pressing powdered tablet material. The punch head 14 is rotationally symmetrical, the axis of rotational symmetry being represented by the reference numeral 15 in dashed lines. The punch head 14 has an upper flat mirror surface 16 that is circular in plan view. It also has an outer cylindrical surface 18. There is a curved transition region 20 between the cylindrical surface 18 and the mirror surface 16. In the example shown, the mirror surface 16 and the transition region 20 form a three-dimensional curved surface, the course of which is described in any radial direction of the punch head 14 by a mathematical function that is continuous in the second derivative. In particular, in the example shown, the radius of curvature of the three-dimensional surface steadily decreases outwards in the radial direction, starting from the center of the mirror surface 16 . The height of the punch head 14 also decreases steadily starting from the mirror surface 16 to the cylinder surface 18 . Between the transition area 20 and the cylinder surface 18 there is an area 22 rounded off with a predetermined radius. On the underside of the punch head 14, between the cylinder surface 18 and the shank 12, there is a convex, in the example spherical, transition area 24 which merges into the cylinder surface 18 via a first rounded area 26 and into the shank via a second rounded area 28 .

In Fig. 2 ist eine mathematische Funktion f(x) bei dem Bezugszeichen 30 dargestellt, die den zweidimensionalen Verlauf des Übergangsbereichs 20 bis zu der Spiegelfläche 16 in beliebiger radialer Richtung abbildet. Es handelt sich dabei um eine Polynomfunktion der folgenden Art: ƒ x = a ⋅ x 3 − b ⋅ x 2 + c ⋅ x

Figure imgb0001
, wobei a, b und c geeignete Konstanten sind, deren Wert sich abhängig von der gewünschten geometrischen Ausbildung des Stempelkopfes bestimmt.In 2 a mathematical function f(x) is shown with the reference number 30, which maps the two-dimensional course of the transition region 20 up to the mirror surface 16 in any radial direction. It is a polynomial function of the following type: ƒ x = a ⋅ x 3 − b ⋅ x 2 + c ⋅ x
Figure imgb0001
 , where a, b and c are suitable constants, the value of which depends on the desired geometric design of the punch head.

Oberhalb der in Fig. 2 gezeigten Werte der x-Achse kann die Funktion 30 dann beispielsweise als konstant definiert sein, so dass sie die plane Spiegelfläche abbildet. Es ist zu beachten, dass in Fig. 2 der Koordinatenursprung auf den unteren Rand der durch den Übergangsbereich 20 und die Spiegelfläche 16 gebildeten dreidimensionalen Fläche gelegt wurde. Die y-Achse stellt somit die Höhe des Stempelkopfes 14 dar. Die in Fig. 2 gezeigte Funktion 30 spannt entsprechend bei einer Rotation um eine geeignete Achse die durch den Übergangsbereich 20 und die Spiegelfläche 16 gebildete dreidimensionale Fläche auf. In dem Diagramm in Fig. 2 weiterhin dargestellt ist strichpunktiert bei dem Bezugszeichen 32 die erste Ableitung f (x) der Funktion f(x). Schließlich ist bei dem Bezugszeichen 34 in Fig. 2 gestrichelt die zweiten Ableitung f"(x) der Funktion f(x) dargestellt. Es ist zu erkennen, dass die zweite Ableitung f'(x) der Funktion f(x) stetig ist.Above the in 2 In the x-axis values shown, the function 30 can then be defined as constant, for example, so that it maps the plane mirror surface. It should be noted that in 2 the coordinate origin was placed on the lower edge of the three-dimensional surface formed by the transition region 20 and the mirror surface 16. The y-axis thus represents the height of the punch head 14. The in 2 The function 30 shown correspondingly spans the three-dimensional surface formed by the transition region 20 and the mirror surface 16 during a rotation about a suitable axis. In the diagram in 2 the first derivative f(x) of the function f(x) is also shown in dash-dotted lines at reference number 32 . Finally, at the reference numeral 34 in 2 the second derivative f″(x) of the function f(x) is shown dashed. It can be seen that the second derivative f′(x) of the function f(x) is continuous.

Der in Fig. 1 gezeigte erfindungsgemäße Pressstempel verringert beim Betrieb in einer Rundläufertablettenpresse sowohl die beim Kontakt mit den Druckrollen auftretenden Geräuschemissionen als auch den Verschleiß des Stempelkopfes und der Druckrollen. Außerdem führt der sehr flache Übergang des Übergangsbereichs 20 in die Spiegelfläche 16 zu einer erhöhten Druckhaltezeit der Stempel, so dass auch schwierig zu verpressende Materialien problemlos verarbeitbar sind.the inside 1 When operated in a rotary tablet press, the press ram according to the invention shown reduces both the noise emissions occurring on contact with the pressure rollers and the wear of the ram head and the pressure rollers. In addition, the very flat transition of the transition area 20 in the mirror surface 16 to an increased pressure holding time of the stamp, so that even difficult-to-press materials can be processed without any problems.

Claims (9)

  1. A press punch for a rotary press, with a shaft (12), a punch head (14) arranged at a shaft end, and a press region arranged on the other shaft end, wherein the punch head (14) has an upper mirror surface (16), an outer cylinder surface (18), and a curved transition region (20) between the mirror surface (16) and the cylinder surface (18), characterized in that the mirror surface (16) and the transition region (20) form a three-dimensional surface, the curve of which is described in at least one radial direction by a mathematical function (30), the second derivative of which is continuous.
  2. The press punch according to claim 1, characterized in that the curve of the surface in any radial direction is described by the mathematical function (30).
  3. The press punch according to claim 2, characterized in that the punch head (14) is rotationally symmetrical.
  4. The press punch according to one of the preceding claims, characterized in that the curvature radius of the three-dimensional surface in the radial direction continuously decreases from the mirror surface (16) to the cylinder surface (18).
  5. The press punch according to one of the preceding claims, characterized in that a region (22) rounded with at least one predefined radius is provided between the transition region (20) and the cylinder surface (18).
  6. The press punch according to one of claims 1 to 4, characterized in that at least one edge is provided between the transition region (20) and the cylinder surface (18).
  7. The press punch according to one of claims 1 to 4, characterized in that the three-dimensional surface includes the cylinder surface (18).
  8. The press punch according to one of the preceding claims, characterized in that the punch head (14) has a convex transition region (24) from the cylinder surface (18) to the shaft (12).
  9. A rotary press with a rotor, which has an upper and a lower punch guide, in each of which a plurality of press punches (10) according to one of the preceding claims are guided, which press punches interact with bores in a die plate arranged between the upper and lower punch guide, wherein the punches (10) can be moved axially in guide bores of the punch guides and their punch heads (14) interact with pressing rollers of the rotary press in order to press pulverulent material in the die bores.
EP10006112.6A 2009-07-02 2010-06-12 Press punch for a rotary press Active EP2269813B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009031367A DE102009031367B3 (en) 2009-07-02 2009-07-02 Press stamp for rotary tabletting press, has reflecting surface and transition area forming three-dimensional surface, where course of three-dimensional surface is described by mathematical function and height of stamp head is decreased

Publications (3)

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EP2269813A2 EP2269813A2 (en) 2011-01-05
EP2269813A3 EP2269813A3 (en) 2015-01-21
EP2269813B1 true EP2269813B1 (en) 2022-10-12

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US (1) US9821525B2 (en)
EP (1) EP2269813B1 (en)
DE (1) DE102009031367B3 (en)
PL (1) PL2269813T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012012575B4 (en) * 2012-06-13 2014-09-25 Jürgen Pagel Tooth pressure roller and profile pressure roller for a rotary press and rotary press
DE102016113724B4 (en) * 2016-07-26 2019-01-17 Fette Compacting Gmbh Stamp for a rotary press

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8111860U1 (en) 1981-04-18 1981-09-24 Mense, Brunfrid, 4630 Bochum "STAMP FOR A TABLET PRESS"
JPH0584277A (en) 1991-08-08 1993-04-06 Kikusui Seisakusho:Kk Lever of rotary type powder forming machine
US5699273A (en) 1995-01-28 1997-12-16 Wilhelm Fette Gmbh Method and apparatus for determining the force-displacement diagram of the pairs of punches of a rotary pelleting machine
US20070087073A1 (en) 2005-08-23 2007-04-19 Chowdhury Tahseen A Tabletting press
EP2111972A2 (en) 2008-04-23 2009-10-28 Fette GmbH Punch for a rotary press

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646536C1 (en) * 1996-10-30 1998-01-29 Korsch Pressen Gmbh Method for producing head surfaces of circular press dies
JP2003106111A (en) * 2001-10-01 2003-04-09 Nsk Ltd Tappet roller
DE102007043582B3 (en) * 2007-09-13 2008-11-27 Fette Gmbh Rotor for a rotary tablet press

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8111860U1 (en) 1981-04-18 1981-09-24 Mense, Brunfrid, 4630 Bochum "STAMP FOR A TABLET PRESS"
JPH0584277A (en) 1991-08-08 1993-04-06 Kikusui Seisakusho:Kk Lever of rotary type powder forming machine
US5699273A (en) 1995-01-28 1997-12-16 Wilhelm Fette Gmbh Method and apparatus for determining the force-displacement diagram of the pairs of punches of a rotary pelleting machine
US20070087073A1 (en) 2005-08-23 2007-04-19 Chowdhury Tahseen A Tabletting press
EP2111972A2 (en) 2008-04-23 2009-10-28 Fette GmbH Punch for a rotary press
DE102008020748A1 (en) 2008-04-23 2009-10-29 Fette Gmbh Stamp for a rotary press

Also Published As

Publication number Publication date
US9821525B2 (en) 2017-11-21
DE102009031367B3 (en) 2010-09-02
US20110000272A1 (en) 2011-01-06
EP2269813A2 (en) 2011-01-05
EP2269813A3 (en) 2015-01-21
PL2269813T3 (en) 2023-05-08

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