EP2269813B1 - Poinçon de presse pour une presse rotative - Google Patents

Poinçon de presse pour une presse rotative 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
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.)
Active
Application number
EP10006112.6A
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German (de)
English (en)
Other versions
EP2269813A2 (fr
EP2269813A3 (fr
Inventor
Friedrich Meissner
Stefan Lüdemann
Jan Naeve
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 Compacting GmbH
Original Assignee
Fette GmbH
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Publication date
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Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP2269813A2 publication Critical patent/EP2269813A2/fr
Publication of EP2269813A3 publication Critical patent/EP2269813A3/fr
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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.

Landscapes

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

Claims (9)

  1. Poinçon de presse pour une presse rotative, doté d'un arbre (12), d'une tête de poinçon (14) disposée à une extrémité d'arbre et d'une zone de pressage disposée à une autre extrémité d'arbre, dans lequel la tête de poinçon (14) présente une surface réfléchissante supérieure (16), une surface cylindrique extérieure (18) et une zone de transition incurvée (20) entre la surface réfléchissante (16) et la surface cylindrique (18),
    caractérisé en ce que la surface réfléchissante (16) et la zone de transition (20) forment une surface tridimensionnelle, dont l'évolution dans au moins une direction radiale est décrite par une fonction mathématique (30) dont la deuxième dérivée est constante.
  2. Poinçon de presse selon la revendication 1, caractérisé en ce que l'évolution de la surface dans n'importe quelle direction radiale est décrite par la fonction mathématique (30).
  3. Poinçon de presse selon la revendication 2, caractérisé en ce que la tête de poinçon (14) est symétrique en rotation.
  4. Poinçon de presse selon l'une des revendications précédentes, caractérisé en ce que le rayon de courbure de la surface tridimensionnelle dans la direction radiale à partir de la surface réfléchissante (16) jusqu'à la surface cylindrique (18) diminue de façon constante.
  5. Poinçon de presse selon l'une des revendications précédentes, caractérisé en ce qu'entre la zone de transition (20) et la surface cylindrique (18), il est prévu une zone arrondie (22) présentant au moins un rayon prédéfini.
  6. Poinçon de presse selon l'une des revendications 1 à 4, caractérisé en ce qu'il est prévu au moins une arête entre la zone de transition (20) et la surface cylindrique (18).
  7. Poinçon de presse selon l'une des revendications 1 à 4, caractérisé en ce que la surface tridimensionnelle inclut la surface cylindrique (18).
  8. Poinçon de presse selon l'une des revendications précédentes, caractérisé en ce que la tête de poinçon (14) présente une zone de transition convexe (24) entre la surface cylindrique (18) et l'arbre (12).
  9. Presse rotative dotée d'un rotor présentant des guides de poinçon supérieur et inférieur dans lesquels une pluralité de poinçons de presse (10) selon l'une des revendications précédentes sont guidés respectivement, lesquels coopèrent avec des alésages d'un disque à matrice disposé entre les guides de poinçon supérieur et inférieur, dans laquelle les poinçons (10) sont déplaçables axialement dans des alésages de guidage des guides de poinçon et leurs têtes de poinçon (14) coopèrent avec des rouleaux de pression de la presse rotative pour comprimer un matériau pulvérulent dans les alésages de matrice.
EP10006112.6A 2009-07-02 2010-06-12 Poinçon de presse pour une presse rotative Active EP2269813B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009031367A DE102009031367B3 (de) 2009-07-02 2009-07-02 Pressstempel für eine Rundläuferpresse

Publications (3)

Publication Number Publication Date
EP2269813A2 EP2269813A2 (fr) 2011-01-05
EP2269813A3 EP2269813A3 (fr) 2015-01-21
EP2269813B1 true EP2269813B1 (fr) 2022-10-12

Family

ID=42371923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10006112.6A Active EP2269813B1 (fr) 2009-07-02 2010-06-12 Poinçon de presse pour une presse rotative

Country Status (4)

Country Link
US (1) US9821525B2 (fr)
EP (1) EP2269813B1 (fr)
DE (1) DE102009031367B3 (fr)
PL (1) PL2269813T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012012575B4 (de) * 2012-06-13 2014-09-25 Jürgen Pagel Zahndruckrolle und Profildruckrolle für eine Rundläuferpresse sowie Rundläuferpresse
DE102016113724B4 (de) 2016-07-26 2019-01-17 Fette Compacting Gmbh Stempel für eine Rundläuferpresse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8111860U1 (de) 1981-04-18 1981-09-24 Mense, Brunfrid, 4630 Bochum "stempel fuer eine tablettenpresse"
JPH0584277A (ja) 1991-08-08 1993-04-06 Kikusui Seisakusho:Kk 回転式粉末成形機の杵
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 (fr) 2008-04-23 2009-10-28 Fette GmbH Poinçon pour une presse rotative

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2003106111A (ja) * 2001-10-01 2003-04-09 Nsk Ltd タペットローラ
DE102007043582B3 (de) * 2007-09-13 2008-11-27 Fette Gmbh Rotor für eine Rundlauf-Tablettenpresse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8111860U1 (de) 1981-04-18 1981-09-24 Mense, Brunfrid, 4630 Bochum "stempel fuer eine tablettenpresse"
JPH0584277A (ja) 1991-08-08 1993-04-06 Kikusui Seisakusho:Kk 回転式粉末成形機の杵
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 (fr) 2008-04-23 2009-10-28 Fette GmbH Poinçon pour une presse rotative
DE102008020748A1 (de) 2008-04-23 2009-10-29 Fette Gmbh Stempel für eine Rundläuferpresse

Also Published As

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

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