WO1989002820A1 - Process for filling a moulding matrix - Google Patents

Process for filling a moulding matrix Download PDF

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Publication number
WO1989002820A1
WO1989002820A1 PCT/DE1988/000578 DE8800578W WO8902820A1 WO 1989002820 A1 WO1989002820 A1 WO 1989002820A1 DE 8800578 W DE8800578 W DE 8800578W WO 8902820 A1 WO8902820 A1 WO 8902820A1
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WIPO (PCT)
Prior art keywords
granules
acoustic waves
filling
matrix
density
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PCT/DE1988/000578
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German (de)
French (fr)
Inventor
Dieter Sprandel
Original Assignee
Dieter Sprandel
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Filing date
Publication date
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Publication of WO1989002820A1 publication Critical patent/WO1989002820A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds
    • 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
    • B30B11/022—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 whereby the material is subjected to vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups

Definitions

  • the invention relates to a method for the metered filling of the hatch openings of a press matrix with granulate made of sinterable, with volume contraction sintering powder in a uniform filling density, in which the die openings from a granule storage container are given predetermined amounts of granulate which exceed the volume of the die openings in which the excess amounts of granulate are then drawn off via the die openings.
  • the compacts are made of sintered metal powder, hard metal powder, ceramics powder for the production of components for the most diverse applications, such as sealing and sliding rings, capacitors, substrates, insulating parts in electronic electrodes, etc., pressed. It is important in the production of the compacts regardless of the type of pressing process and regardless of the type of filling process that the die openings of the press matrix are filled with metered amounts of granules.
  • a method for the metered filling of the matrix openings of a press matrix is known from DE-OS 24 00 791.
  • a compact produced has a bulk density (weight / o lumen) which is less than the density of the individual granules.
  • the compression of the granulate to form the shaped body depends on many factors, such as the particle size distribution in the granulate, the friction ratio in the press granulate (which depends on the properties of the binder and lubricants added), the type of granulate, the structure, the material , the surface procurement and the geometry of the press tools
  • the degree of compression is given either as an absolute value (g / cm 3 ) or as a percentage of the theoretical density, which can take values between 50% and 80%.
  • the compact is subjected to a heat treatment at such high temperatures that physical and / or chemical processes take place between the granules, the grains come closer to one another. This process is called sintering. In any case, the volume is reduced. For a certain material and given sintering conditions, this contraction, known as shrinkage, essentially depends on the pressing density.
  • the shrinkage is related to the density of the press in such a way that the more the compact is compacted, and the lower it is, and vice versa.
  • the molded body produced from a sinterable material therefore has an achievable dimensional accuracy which is dependent on the shrinkage and therefore on the compression density.
  • the compression density should not only remain constant within a series of compacts produced, but first of all also within the individual compact. If there are different press densities within a compact, deviations from the original geometric shape (warping) result as a result of the inevitable shrinkage or there are mechanical stresses in the compact which can lead to cracks.
  • REPLACEMENT LEAF overall has a constant vibrating density in order to achieve a constant pressing density in the entire volume in the compact produced therefrom.
  • This object is achieved according to the invention in that the quantities of granules supplied to the die openings are compressed by means of acoustic waves before being removed. With the acoustic waves, a vibration can be carried out in the granules without causing the press matrix or the device feeding the granules to vibrate.
  • the method according to the invention can be implemented with a simple device, since only one generator for acoustic waves, e.g. a loudspeaker or the like, must be arranged over the die openings of the press matrix.
  • This device can also be easily used in an existing system, e.g. described in DE-OS 24 00 791, retrofit. The large scattering range of the density between the bulk density and the vibrating density, which occurs without this vibration, is avoided. This leads to a high quality and accuracy of the moldings produced.
  • the action of the acoustic waves is carried out on the pre-metered granules according to an embodiment such that the quantities of granules supplied to the die openings are subjected to acoustic waves during the filling of the matrix openings with granules and / or after filling with granules.
  • the optimum in terms of the vibratory density can be achieved in that the frequency of the acoustic waves is selected as a function of the density and / or the grain size of the granules.
  • the frequency of the acoustic waves is selected in the range from 50 Hz to 2000 Hz, in particular from 60 Hz to 250 Hz.
  • REPLACEMENT BLA ⁇ One embodiment provides that the frequency of the acoustic waves is kept constant during the exposure.
  • the vibration density can also be achieved by increasing and / or decreasing the frequency of the acoustic waves during exposure to a predetermined frequency range.
  • a press table is shown at 10, which has an opening 11.
  • the ram 12 is guided adjustable.
  • the press die 12 assumes the position shown when the die opening 16 is filled, the top of the press table 10 and the press die 12 with the opening 11 delimiting the matrix opening 16 with a volume which is required for the compact to be produced.
  • the matrix opening 16 also determines the shape of the molded body to be produced.
  • the filling slide 13, which has an opening 14, can be moved on the press table 10.
  • the filler sled 13 is provided with the opening 14 under the run-out opening of the granule storage container 17.
  • the granulate 18 fills the opening 14 in the filler sled 13, as shown by the pre-metered amount 15, which shows when the filler sled 13 is moved to the left into the Matrix opening 16 arrives.
  • the generator 19 for acoustic waves is located above the opening 14 of the filling sluice 13 and passes through the funnel 20 to the pre-metered amount 15 of the granulate 18 act.
  • the pre-metered amount 15 of granules 18 has a volume that is greater than the volume of the matrix opening 16, which is limited by the opening 11 and the press ram 12. The acoustic waves bring in the pre-metered amount
  • the frequency of the acoustic waves can be adapted to the flow properties of the granulate 18.
  • the frequency is preferably selected in the range from 50 Hz to 2000 Hz. The choice of frequency takes into account the weight and / or the grain size of the granulate.
  • the filling slit 13 is adjusted to the right again.
  • the excess amount of the granules is drawn off over the matrix opening 16.
  • the breakthrough 14 is located under the outlet opening of the granulate storage container
  • the application of the pre-metered quantity 15 with the acoustic waves can take place during the filling and / or after the filling of the matrix opening 16.
  • the frequency of the acoustic waves can remain constant or can be changed in an increasing and / or decreasing manner in a predetermined frequency range during the application.
  • the press table can have several die openings that are filled at the same time.
  • the acoustic waves are then fed to all die openings.

Abstract

In a process for metered filling of the matrix voids (16) of a moulding matrix with granules of sinterable powder in which sintering is accompanied by contraction of volume and which is of uniform bulk density, predetermined quantities of granules in excess of the volume of the matrix voids (16) are supplied to the matrix voids from a granule supply container (17) and the excess quantities of granules which rise above the matrix voids are removed. To ensure a constant filling density of the predetermined metered quantities of granules in the matrix voids (16) which corresponds to the compacted apparent density, the quantities of granules supplied to the matrix voids (16) are compacted by acoustic waves before removal.

Description

Verfahren zum Füllen einer Preßtnatrix Process for filling a press matrix
Die Erfindung betrifft ein Verfahren zum dosierten Füllen der Hat ri zenöffnungen einer Preßmatrix mit Granulat aus si nterfähi gern, unter Volumenkontraktion sinterndem Pulver in gleichmäßiger Fülldichte, bei dem den Matrizenöffnungen aus einem GranulatVorratsbehä Iter vorgegebene, das Volumen der Matrizenöffnungen übersteigende Mengen an Granulat zugeführt werden und bei dem danach die überschüssigen Mengen an Granulat über den Matrizenöffnungen abgezogen werden.The invention relates to a method for the metered filling of the hatch openings of a press matrix with granulate made of sinterable, with volume contraction sintering powder in a uniform filling density, in which the die openings from a granule storage container are given predetermined amounts of granulate which exceed the volume of the die openings in which the excess amounts of granulate are then drawn off via the die openings.
Die Preßlinge werden aus Sintermetallpulver, Hartmetallpulver, Kerami pulvern zur Herstellung von Bauteilen für die versc edensten Anwendungen, wie Dicht- und Gleitringe, Kondensatoren, Substrate, Isoliertei le in E lektronenro ren usw., gepreßt. Dabei kommt es bei der Herstellung der Preßlinge unabhängig von der Art des Preßvorganges und unabhängig von der Art des Fül Lvorganges darauf an, daß die Matrizenöffnungen der Preßmatrix mit dosierten Mengen an Granulat gefüllt werden. Ein Verfahren zum dosierten Füllen der Matrizenöf nungen einer Preßmatrix ist aus der DE-OS 24 00 791 bekannt.The compacts are made of sintered metal powder, hard metal powder, ceramics powder for the production of components for the most diverse applications, such as sealing and sliding rings, capacitors, substrates, insulating parts in electronic electrodes, etc., pressed. It is important in the production of the compacts regardless of the type of pressing process and regardless of the type of filling process that the die openings of the press matrix are filled with metered amounts of granules. A method for the metered filling of the matrix openings of a press matrix is known from DE-OS 24 00 791.
Ein hergestellter Preßling hat eine Rohdichte (Gewi cht / o lumen) , die kleiner ist als die Dichte der einzelnen Granulatkörper. Die Verdichtung des Granulats zum Formkörper hängt von vielen Faktoren ab, wie der Korngrößenverteilung im Granulat, den Rei bungsverhä ltni ssen in dem Preßgranulat (die von den Eigenschaften der beigefügten Binde- und Gleitmittel abhängt), der Art des Granulats, dem Aufbau, dem Material, der Oberflächenbeschaf ung und der Geometrie des Preßwe rkzeugeεA compact produced has a bulk density (weight / o lumen) which is less than the density of the individual granules. The compression of the granulate to form the shaped body depends on many factors, such as the particle size distribution in the granulate, the friction ratio in the press granulate (which depends on the properties of the binder and lubricants added), the type of granulate, the structure, the material , the surface procurement and the geometry of the press tools
ERSATZBLATT und schließlich dem aufgebrachten Preßruck. Der Grad der Verdichtung wird entweder als absoluter Wert (g/cm3) oder in Prozent der theoret schen Dichte angegeben, die Werte zwischen 50 % und 80 % annehmen kann.REPLACEMENT LEAF and finally the applied pressure. The degree of compression is given either as an absolute value (g / cm 3 ) or as a percentage of the theoretical density, which can take values between 50% and 80%.
Wird der Preßling einer Wärmebehandlung mit so hohen Temperaturen unterzogen, daß zwischen den Granulatkörpern physi alische und/oder chemische Vorgänge ablaufen, dann nähern sich die Körner aneinander. Diesen Vorgang nennt man Sintern. In jedem Fall tritt dabei eine Volumenreduzierung ein. Diese als Schwund bezeichnete Kontraktion hängt bei einem bestimmten Material und gegebenen Sinterbedingungen im wesentlichen von der Preßd chte ab.If the compact is subjected to a heat treatment at such high temperatures that physical and / or chemical processes take place between the granules, the grains come closer to one another. This process is called sintering. In any case, the volume is reduced. For a certain material and given sintering conditions, this contraction, known as shrinkage, essentially depends on the pressing density.
Der Schwund hängt mit der Preßdichte in der Weise zusammen, daß er umso geringer ist, je stärker der Preßling verdichtet wurde und umgekehrt. Die für einen aus sinterfähigem Material hergestellten Formkörper haben daher eine erreichbare Maßgenauigkeit, die vom Schwund und daher von der Preßdichte abhängig ist.The shrinkage is related to the density of the press in such a way that the more the compact is compacted, and the lower it is, and vice versa. The molded body produced from a sinterable material therefore has an achievable dimensional accuracy which is dependent on the shrinkage and therefore on the compression density.
Die Preßdichte soll nicht nur innerhalb einer Serie von hergestellten Preßlingen konstant bleiben, sondern zunächst einmal auch innerhalb des einzelnen Preßlings. Liegen innerhalb eines Preßlings unterschiedl che Preßdichten vor, dann ergeben sich infolge des zwangsweise vorhandenen Schwundes Abweichungen von der ursprünglichen geome rischen Form (Verzug) oder es ergeben sich mechanische Spannungen im Preßling, die zu Rissen führen können.The compression density should not only remain constant within a series of compacts produced, but first of all also within the individual compact. If there are different press densities within a compact, deviations from the original geometric shape (warping) result as a result of the inevitable shrinkage or there are mechanical stresses in the compact which can lead to cracks.
Es ist Aufgabe der Erfindung, bei einem Verfahren zum dosierten Füllen der Matrizenöffnungen einer Preßmatrix mit Granulat dafür zu sorgen, daß die in die Matrizenöffnungen der Preßmatrix eingefüllte Menge an Granulat so vorverdichtet wird, daß sieIt is an object of the invention to provide in a method for the metered filling of the die openings of a press matrix with granules that the amount of granules filled into the die openings of the press matrix is pre-compressed so that they
ERSATZBLATT insgesamt eine konstante Rütteldichte aufweist, um in dem daraus hergestellten Preßling im gesamten Volumen eine konstante Preßdichte zu erreichen.REPLACEMENT LEAF overall has a constant vibrating density in order to achieve a constant pressing density in the entire volume in the compact produced therefrom.
Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die den Matrizenöffnungen zugeführten Mengen an Granulat vor dem Abziehen mittels akustischer Wellen verdichtet werden. Mit den akustischen Wellen kann in dem Granulat eine Vibration vorgenommen werden, ohne die Preßmatrix oder die das Granulat zuführende Vorrichtung in Vibra ionsbewegungen zu versetzen. Das Verfahren nach der Erfindung läßt sich mit einer einfachen Vorrichtung realisieren, da nur ein Generator für akustische Wellen, z.B. ein Lautsprecher oder dgl, über den Matrizenöffnungen der Preßmatrix angeordnet werden muß. Diese Vorrichtung läßt sich auch leicht bei einer bestehenden Anlage, wie sie z.B. in der DE-OS 24 00 791 beschrieben ist, nachrüsten. Dabei wird der große Streubereich der Dichte zwischen de r Schüttdichte und der Rütteldichte, der ohne diese Vibration auftritt, vermieden. Dies führt zu einer hohen Qualität und Genauigkeit der hergestellten Formkörper.This object is achieved according to the invention in that the quantities of granules supplied to the die openings are compressed by means of acoustic waves before being removed. With the acoustic waves, a vibration can be carried out in the granules without causing the press matrix or the device feeding the granules to vibrate. The method according to the invention can be implemented with a simple device, since only one generator for acoustic waves, e.g. a loudspeaker or the like, must be arranged over the die openings of the press matrix. This device can also be easily used in an existing system, e.g. described in DE-OS 24 00 791, retrofit. The large scattering range of the density between the bulk density and the vibrating density, which occurs without this vibration, is avoided. This leads to a high quality and accuracy of the moldings produced.
Die Einwirkung der akustischen Wellen wird auf das vordosierte Granulat nach einer Ausgestaltung so vorgenommen, daß die den Matrizenöffnungen zugeführten Mengen an Granulat während des Füllens der Mat ri zenδffnungen mit Granulat und/oder nach dem Füllen mit Granulat mit akustischen Wellen beaufschlagt werden.The action of the acoustic waves is carried out on the pre-metered granules according to an embodiment such that the quantities of granules supplied to the die openings are subjected to acoustic waves during the filling of the matrix openings with granules and / or after filling with granules.
Das Optimum in der Vor erdi chtung auf die Rütteldichte läßt sich nach einer Ausgestaltung dadurch erreichen, daß die Frequenz der akustischen Wellen in Abhängigkeit von der Dichte und/oder der Korngröße des Granulates gewählt wird. Dabei wird die Frequenz der akustischen Wellen in dem Bereich von 50 Hz bis 2000 Hz, insbesondere von 60 Hz bis 250 Hz, gewählt.According to one embodiment, the optimum in terms of the vibratory density can be achieved in that the frequency of the acoustic waves is selected as a function of the density and / or the grain size of the granules. The frequency of the acoustic waves is selected in the range from 50 Hz to 2000 Hz, in particular from 60 Hz to 250 Hz.
ERSATZBLAΓΓ Eine Ausgestaltung sieht dabei vor, daß die Frequenz der akustischen Wellen während der Beaufsc lagung konstant gehalten wi rd.REPLACEMENT BLAΓΓ One embodiment provides that the frequency of the acoustic waves is kept constant during the exposure.
Bei einem Granulat mit schlechter Fließei enschaft kann die Rütteldichte auch dadurch erreicht werden, daß die Frequenz der akustischen Wellen während der Beaufschlagung in einem vorgegebenen Frequenzbereich steigend und/oder fallend geändert wi rd .In the case of granules with poor flow properties, the vibration density can also be achieved by increasing and / or decreasing the frequency of the acoustic waves during exposure to a predetermined frequency range.
Die Erfindung wird anhand einer schematisch dargestellten Vorrichtung zur Durchführung des Verfahren zum dosierten Füllen einer Preßmatr x näher erläutert.The invention is explained in more detail using a schematically illustrated device for carrying out the method for the metered filling of a press die x.
In der Zeichnung ist mit 10 ein Pressentisch gezeigt, der einen Durchbruch 11 aufweist. In diesem Durchbruch 11 ist der Preßstempel 12 verstellbar geführt. Der Preßstempel 12 nimmt beim Füllen der Matri xδffnung 16 die gezeigte Stellung ein, wobei die Oberseite des Pressentisches 10 und des Preßstempels 12 mit dem Durchbruch 11 die Matrixöffnung 16 mit einem Volumen begrenzt, das für den herzustellenden Preßling erforderlich ist. Außerdem bestimmt die Matri xδffnung 16 auch die Form des herzustellenden Formkörpers.In the drawing, a press table is shown at 10, which has an opening 11. In this opening 11, the ram 12 is guided adjustable. The press die 12 assumes the position shown when the die opening 16 is filled, the top of the press table 10 and the press die 12 with the opening 11 delimiting the matrix opening 16 with a volume which is required for the compact to be produced. In addition, the matrix opening 16 also determines the shape of the molded body to be produced.
Auf dem Pressentisch 10 ist der Füllschlitten 13 verschiebbar, der einen Durchbruch 14 aufweist. Zu Beginn des Füllvorganges steht der Füllsc litten 13 mit dem Durchbruch 14 unter der Aus laufÖffnung des Granulatvorratsbehälters 17. Das Granulat 18 füllt den Durchbruch 14 im Füllschlitten 13 aus, wie d e vordosierte Menge 15 zeigt, welche beim Verschieben des Füllschlittens 13 nach Links in die Matrixöffnung 16 gelangt. Über dem Durchbruch 14 des Füllschl ttens 13 steht in der Entleerstellung der Generator 19 für akustische Wellen, die über den Trichter 20 auf die vordosierte Menge 15 des Granulats 18 einwirken. Die vordosierte Menge 15 an Granulat 18 hat ein Volumen, das größer ist als das Volumen der Matrixöffnung 16, die durch den Durchbruch 11 und den Preßstempel 12 begrenzt ist. Die akustischen Wellen bringen in der vordosierten MengeThe filling slide 13, which has an opening 14, can be moved on the press table 10. At the beginning of the filling process, the filler sled 13 is provided with the opening 14 under the run-out opening of the granule storage container 17. The granulate 18 fills the opening 14 in the filler sled 13, as shown by the pre-metered amount 15, which shows when the filler sled 13 is moved to the left into the Matrix opening 16 arrives. In the emptying position, the generator 19 for acoustic waves is located above the opening 14 of the filling sluice 13 and passes through the funnel 20 to the pre-metered amount 15 of the granulate 18 act. The pre-metered amount 15 of granules 18 has a volume that is greater than the volume of the matrix opening 16, which is limited by the opening 11 and the press ram 12. The acoustic waves bring in the pre-metered amount
15 eine Rütteldichte, die im gesamten Bereich der Matrixöffnung15 a vibration density, which in the entire area of the matrix opening
16 konstant ist. Dabei kann die Frequenz der akustischen Wellen an die Fließeigenschaften des Granulats 18 angepaßt werden. Die Frequenz wird vorzugsweise in dem Bereich von 50 Hz bis 2000 Hz gewählt. Die Wahl der Frequenz berücksichtigt das Gewicht und/oder die Korngröße des Granulats.16 is constant. The frequency of the acoustic waves can be adapted to the flow properties of the granulate 18. The frequency is preferably selected in the range from 50 Hz to 2000 Hz. The choice of frequency takes into account the weight and / or the grain size of the granulate.
Nach der Beaufschlagung der vordosierten Menge 15 des Granulats 18 mit den akustischen Wellen wird der Fü l lsch li tten 13 wieder nach rechts verstellt. Dabei wird die überschüssige Menge des Granulats über der Matrixöffnung 16 abgezogen. Der Durchbruch 14 steht unter der Aus laufÖffnung des Granu latvorratsbehä ItersAfter the pre-metered amount 15 of the granulate 18 has been subjected to the acoustic waves, the filling slit 13 is adjusted to the right again. The excess amount of the granules is drawn off over the matrix opening 16. The breakthrough 14 is located under the outlet opening of the granulate storage container
17 und wird ieder mit Granulat 18 aufgefüllt.17 and is again filled with granules 18.
Die Beaufschlagung der vordosierten Menge 15 mit den akustischen Wellen kann während des Füllens und/oder nach dem Füllen de r Matrixöffnung 16 erfolgen. Dabei kann die Frequenz der akustischen Wellen konstant bleiben oder während der Beaufschlagung in einem vorgegebenen Frequenzbereich steigend und/oder fallend geändert werden.The application of the pre-metered quantity 15 with the acoustic waves can take place during the filling and / or after the filling of the matrix opening 16. The frequency of the acoustic waves can remain constant or can be changed in an increasing and / or decreasing manner in a predetermined frequency range during the application.
Der Pressentisch kann mehrere Matrizenöffnungen aufweisen, die gleichzeitig gefüllt werden. Die akustischen Wellen werden dann allen Matrizenöffnungen zugeführt.The press table can have several die openings that are filled at the same time. The acoustic waves are then fed to all die openings.
ERSATZBLATT REPLACEMENT LEAF

Claims

A n s p r ü c h eExpectations
1. Verfahren zum dosierten Füllen der Matrizenöffnungen einer Preßmatrix mit Granulat aus sinterfähigem, unter Volumenkontraktion sinterndem Pulver in gleichmäß ger Fülldichte, bei dem den Matrizenöffnungen aus einem Granulatvorratsbehälter vorgegebene, das Volumen der Hat ri zenöffnungen übersteigende Mengen an Granulat zugeführt werden und bei dem danach die überschüssigen Mengen an Granulat über den Matrizenöffnungen abgezogen werden, dadurch gekennzeichnet, daß die den Matrizenöffnungen (16) zugeführten Mengen (15) an Granulat (18) vor dem Abziehen mittels akustischer Wellen verdichtet werden.1. Method for the metered filling of the die openings of a press matrix with granules of sinterable powder which sinters with volume contraction in a uniform filling density, in which the die openings from a granule storage container are given predetermined amounts of granules which exceed the volume of the hatch openings and after which the granules are fed Excess quantities of granulate are drawn off via the die openings, characterized in that the quantities (15) of granulate (18) fed to the die openings (16) are compressed by means of acoustic waves before they are drawn off.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die den Matr zenöffnungen (16) zugeführten MengenA method according to claim 1, characterized in that the amounts supplied to the die openings (16)
(15) an Granulat (18) während des Füllens der(15) on granules (18) during the filling of the
Matrizenöffnungen (16) m t Granulat (18) und/oder nach dem Füllen mit Granulat (18) mit akustischen Wellen beaufschlagt werden.Die openings (16) with t granules (18) and / or after filling with granules (18) are subjected to acoustic waves.
Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet,A method according to claim 1 or 2, characterized in that
ERSATZBLATT daß die Frequenz der akustischen Wellen in Abhängigkeit von der Dichte und/oder der Korngröße des Granulates (18) gewäh Lt wird.REPLACEMENT LEAF that the frequency of the acoustic waves is selected depending on the density and / or the grain size of the granules (18).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Frequenz der akustischen Wellen in dem Bereich von 50 HZ bis 2000 HZ insbesondere von 60 Hz bis 250 Hz, gewählt wird.4. The method according to any one of claims 1 to 3, characterized in that the frequency of the acoustic waves in the range from 50 Hz to 2000 Hz, in particular from 60 Hz to 250 Hz, is selected.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Frequenz der akustischen Wellen während der Beaufschlagung konstant gehalten wird.5. The method according to any one of claims 1 to 4, characterized in that the frequency of the acoustic waves is kept constant during the application.
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Frequenz der akustischen Wellen während der Beaufschlagung in einem vorgegebenen Frequenzbereich steigend und/oder fallend geändert wird.6. The method according to any one of claims 1 to 4, characterized in that the frequency of the acoustic waves is changed during the application in a predetermined frequency range increasing and / or decreasing.
ERSATZBLATT REPLACEMENT LEAF
PCT/DE1988/000578 1987-09-22 1988-09-16 Process for filling a moulding matrix WO1989002820A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873731769 DE3731769A1 (en) 1987-09-22 1987-09-22 METHOD FOR FILLING A PRESS MATRIX
DEP3731769.5 1987-09-22

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WO1989002820A1 true WO1989002820A1 (en) 1989-04-06

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EP0417831A1 (en) * 1989-09-13 1991-03-20 Juda, Françoise Claire Process and apparatus for making earthen blocks
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US6089147A (en) * 1996-01-31 2000-07-18 Saitec S.R.L. Process for pressing materials

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DE3731769A1 (en) 1989-03-30

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