EP1277564B1 - Method of compacting powder materials - Google Patents
Method of compacting powder materials Download PDFInfo
- Publication number
- EP1277564B1 EP1277564B1 EP02015132A EP02015132A EP1277564B1 EP 1277564 B1 EP1277564 B1 EP 1277564B1 EP 02015132 A EP02015132 A EP 02015132A EP 02015132 A EP02015132 A EP 02015132A EP 1277564 B1 EP1277564 B1 EP 1277564B1
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- European Patent Office
- Prior art keywords
- deformation
- forces
- die plate
- pressing
- rams
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- 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
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000843 powder Substances 0.000 title abstract description 10
- 239000000463 material Substances 0.000 title abstract description 9
- 238000005056 compaction Methods 0.000 claims 2
- 239000012254 powdered material Substances 0.000 claims 2
- 238000003825 pressing Methods 0.000 abstract description 37
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B30B11/005—Control arrangements
Definitions
- the invention relates to a method for pressing the powder material according to claim 1.
- a common way to compress powder material is to form the mold space in a so-called die plate and produce the compact with the aid of an upper and a lower punch.
- the lower punch is moved into a predetermined position in the die bore, after which the filling is done with powder material.
- the compact is shaped by means of the upper punch.
- a method e.g. Pressed metal powder for the production of moldings by the sintering process.
- Such a method is described for example in DE-A-29 51 716.
- the aim is to form the compact as far as possible already relatively accurate in terms of its geometric dimensions and its density, so that later after the sintering process, the desired dimensional stability is achieved.
- the compact has a geometric shape in which an oblique surface is provided on the outside, as is the case, for example, with inserts of milling and boring tools, then a considerable deformation force is exerted on the die plate during the pressing process.
- the deformation force leads to deformation of the die plate by bending and compression.
- the resulting bending of the die plate can be reduced via a clever choice of the bearing surfaces and the Matrizenplattenquerroughe, but not eliminated.
- the deformation of the die plate must not be disregarded. It is necessary that the upper punch precisely aligns the edge at the transition of the forming surfaces. If the upper punch is not stopped at this point, it will damage the punch and die. If, on the other hand, the stamp is stopped too early, dimensional accuracy is lacking.
- the invention has for its object to provide a method for pressing powder material with which a compact can be produced reproducibly precise while protecting the pressing device against unwanted damage due to insufficient deformation of the die plate.
- the invention is based on the fact that the bending force acting on the die plate results from the difference between the pressing forces of the upper and lower punches.
- a table for the dependence of the deformation of the die plate is created by the applied compressive forces.
- For setting the delivery of the ram is also essential to know which displacements of the die bore set with different deformations. Therefore, in the method according to the invention during the pressing process from time to time or continuously the pressing force on the punches is measured to determine the respective deformation forces by applying the deformation forces on the table.
- At a certain deformation value of the die plate includes a predetermined feed path for the ram.
- the upper punch moves against an edge of the die bore if no deformation of the die plate occurs. Since, as mentioned, constantly the pressing force is measured, but this can also fall below certain values, can be determined in this way, when the entire pressing device is to be stopped, so that damage to the upper punch and die bore is avoided.
- an embodiment of the invention provides that for a number of different pressing forces on the punches whose compression deformation is measured or calculated.
- the correlating values of compression deformation and compression forces are stored in a table in a memory. The delivery of upper and lower stamps will then be corrected according to the compression.
- a pressing device 10 shown in FIG. 1 has a die plate 12, with a die bore 14, with which an upper punch 16 and a lower punch 18 cooperate.
- the power devices that actuate the punches 16, 18 are not shown. They are conventional and e.g. hydraulically acting. It is possible with such pressing devices to position the Preßtempel in the micron range. Between the power devices, not shown, and the punches 16, 18 each have a load cell 20 and 22 respectively.
- the die plate 12 rests on offended supports 24, 26.
- the actual mold cavity of the die bore 14 is conical or trapezoidal in cross-section with two inclined surfaces 26. If a circular cavity is present, naturally only one conical surface is present.
- the mold space which can be seen in Figure 1, is used for example for producing a compact of metal powder material for producing an indexable insert after the sintering process, eg for milling or drilling tools or the like.
- Both rams 16, 18 enter into the bore 14, wherein the upper ram is to move up to the edge 28 and thus determines the position of the top of the compact, while the lower punch is approaching the edge 30, to specify the thickness of the compact.
- the lower punch 18 is first retracted to a filling position. Then a filling with powder material takes place.
- the upper punch 16 is actuated and moved up to the edge 28, to deform the compact by pressing. At the same time we drove the lower punch 18 to edge 30.
- the pressing forces acting on the press dies 16, 18 are constantly or intermittently measured with the help of the load cells 20, 22 and calculated from you the deformation force.
- the computer 30 transmits the delivery path of the press ram 16 and outputs to a control device 32 a corresponding positioning signal for force members 34 and 36 for the ram 16, 18.
- a control device 32 transmits the delivery path of the press ram 16 and outputs to a control device 32 a corresponding positioning signal for force members 34 and 36 for the ram 16, 18.
- the computer 30 If too small a value occurs during the measurement of the pressing forces, the computer 30 generates a shutdown signal for the pressing device 10. This avoids damage to the punch and die plate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Control Of Presses (AREA)
- Punching Or Piercing (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Press Drives And Press Lines (AREA)
- Forging (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Verpressen vom Pulvermaterial nach dem Patentanspruch 1.The invention relates to a method for pressing the powder material according to claim 1.
Eine übliche Verfahrensweise, Pulvermaterial zu verpressen besteht darin, den Formraum in einer sogenannten Matrizenplatte auszubilden und mit Hilfe eines Ober- und eines Unterstempels den Preßling herzustellen. Üblicherweise wird der Unterstempel in eine vorgegebene Position in die Matrizenbohrung eingefahren, wonach die Befüllung mit Pulvermaterial erfolgt. Anschließend wird mit Hilfe des Oberstempels der Preßling geformt. Mit Hilfe eines derartigen Verfahrens wird z.B. Metallpulver für die Herstellung von Formteilen nach dem Sinterverfahren verpresst. Ein solches Verfahren ist etwa in DE-A-29 51 716 beschrieben. Dabei wird angestrebt, den Preßling nach Möglichkeit schon relativ präzise im Hinblick auf seine geometrischen Abmessungen und seine Dichte zu formen, so daß später nach dem Sinterprozeß die gewünschte Maßhaltigkeit erreicht wird.A common way to compress powder material is to form the mold space in a so-called die plate and produce the compact with the aid of an upper and a lower punch. Usually, the lower punch is moved into a predetermined position in the die bore, after which the filling is done with powder material. Subsequently, the compact is shaped by means of the upper punch. By means of such a method, e.g. Pressed metal powder for the production of moldings by the sintering process. Such a method is described for example in DE-A-29 51 716. The aim is to form the compact as far as possible already relatively accurate in terms of its geometric dimensions and its density, so that later after the sintering process, the desired dimensional stability is achieved.
Weist der Preßling eine geometrische Form auf, bei der eine Schrägfläche an der Außenseite vorgesehen ist, wie das z.B. bei Schneidplatten von Fräs- und Bohrwerkzeugen der Fall ist, dann wird während des Preßvorgangs eine nicht unerhebliche Verformungskraft auf die Matrizenplatte ausgeübt. Die Verformungskraft führt zur Verformung der Matrizenplatte durch Biegung und Stauchung. Die dadurch hervorgerufene Biegung der Matrizenplatte kann über eine geschickte Wahl der Auflageflächen und der Matrizenplattenquerschnitte verringert, aber nicht eliminiert werden.If the compact has a geometric shape in which an oblique surface is provided on the outside, as is the case, for example, with inserts of milling and boring tools, then a considerable deformation force is exerted on the die plate during the pressing process. The deformation force leads to deformation of the die plate by bending and compression. The resulting bending of the die plate can be reduced via a clever choice of the bearing surfaces and the Matrizenplattenquerschnitte, but not eliminated.
Bei dem zuletzt beschriebenen Preßverfahren darf die Verformung der Matrizenplatte nicht außer acht gelassen werden. Es ist erforderlich, daß der Oberstempel die Kante am Übergang der Formflächen präzise anfährt. Wird der Oberstempel nicht an diesem Punkt angehalten, kommt es zu einer Beschädigung von Stempel und Matrize. Wird der Stempel hingegen zu früh angehalten, fehlt es an der Maßhaltigkeit.In the pressing method last described, the deformation of the die plate must not be disregarded. It is necessary that the upper punch precisely aligns the edge at the transition of the forming surfaces. If the upper punch is not stopped at this point, it will damage the punch and die. If, on the other hand, the stamp is stopped too early, dimensional accuracy is lacking.
Aus Patent Abstract of Japan 006, Nr. 069 (N-125) 30. April 1982 ist bekannt geworden, bei einer Stufe im Formhohlraum der Matrizenplatte diese und auch den Oberstempel zu schützen, indem während des Preßvorgangs der Preßstempel vor Erreichen seiner Endstellung gestoppt wird. Der Preßvorgang des Oberstempels wird fortgesetzt, wenn zum Augenblick des Stoppvorgangs eine vorgegebene Kompressionskraft festgestellt wird. Ferner wird die Verformung des Preßstempels und der Matrizenplatte sowie der Abstand des Oberstempels von der Stufe bestimmt, um zu vermeiden, dass der Oberstempel gegen die Stufe anstößt.From Patent Abstract of Japan 006, No. 069 (N-125) April 30, 1982 it has become known to protect these and also the upper punch at a stage in the mold cavity of the die plate by stopping the ram from reaching its end position during the pressing operation , The pressing operation of the upper punch is continued when a predetermined compression force is detected at the moment of stopping. Further, the deformation of the punch and the die plate and the distance of the upper punch is determined by the stage to avoid that the upper punch abuts against the step.
Aus der zuletzt genannten Druckschrift ist auch bekannt geworden, während des Preßvorgangs die Preßkräfte der Stempel zu messen und mit gesetzten Werten in Beziehung zu setzen.From the last-mentioned document it has also become known, during the pressing process, to measure the pressing forces of the punches and to relate them to set values.
Es ist auch denkbar, durch Versuche oder rechnerisch zu ermitteln, um welchen Betrag eine Matrizenplatte bei einem bestimmten Preßprozeß verformt wird, um den Verstellweg des Oberstempels entsprechend vorzugeben. Normalerweise erfolgt dies dadurch, daß am Preßling festgestellt wird, ob der Preßstempel die vorgegebene Strecke zurückgelegt hat oder nicht. Ein derartiges Verfahren ist relativ aufwendig und schützt die Preßvorrichtung nicht vor Beschädigungen. Kommt es aufgrund unzureichender Befüllung zu relativ kleinen Preßkräften, entfällt die Verformung der Matrizenplatte oder erreicht deutlich kleinere Werte, so daß die Positionierung des Preßstempel zwangsläufig zur Folge hat, daß der Oberstempel gegen die Kante der Matrizenbohrung anfährt.It is also conceivable to determine by experiments or by calculation, by what amount a die plate is deformed at a certain pressing process to specify the displacement of the upper punch accordingly. Normally, this is done in that it is determined on the compact, whether the ram has covered the predetermined distance or not. Such a method is relatively expensive and does not protect the pressing device from damage. If it comes to insufficient pressing forces due to insufficient filling, eliminates the deformation of the die plate or reaches much smaller values, so that the positioning of the ram inevitably has the consequence that the upper punch against the edge of the die bore anfährt.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Verpressen von Pulvermaterial zu schaffen, mit dem ein Preßling reproduzierbar präzise hergestellt werden kann bei gleichzeitigem Schutz der Preßvorrichtung gegen ungewollte Beschädigungen aufgrund unzureichender Verformung der Matrizenplatte.The invention has for its object to provide a method for pressing powder material with which a compact can be produced reproducibly precise while protecting the pressing device against unwanted damage due to insufficient deformation of the die plate.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.
Die Erfindung geht davon aus, daß die auf die Matrizenplatte wirkende Biegekraft sich aus der Differenz der Preßkräfte von Ober- und Unterstempel ergibt. Beim erfindungsgemäßen Verfahren wird eine Tabelle für die Abhängigkeit der Verformung der Matrizenplatte von den aufgebrachten Preßkräften erstellt. Für die Einstellung der Zustellwege der Preßstempel ist außerdem wesentlich zu wissen, welche Verlagerungen der Matrizenbohrung sich bei unterschiedlichen Verformungen einstellen. Daher wird bei dem erfindungsgemäßen Verfahren während des Preßvorgangs von Zeit zu Zeit oder auch kontinuierlich die Preßkraft an den Stempeln gemessen zur Ermittlung der jeweiligen Verformungskräfte durch Anwendung der Verformungskräfte auf die Tabelle. Zu einem bestimmten Verformungswert der Matrizenplatte gehört ein vorgegebener Zustellweg für die Preßstempel. Es ist daher möglich, mit Hilfe des erfindungsgemäßen Verfahrens während des Preßvorgangs die Länge des Zustellweges nach Maßgabe der beschriebenen Messungen zu korrigieren. Mit Hilfe der Erfindung wird daher erreicht, daß der Oberstempel präzise an die Kante der Matrizenbohrung herangefahren wird, ohne sie jedoch signifikant zu berühren.The invention is based on the fact that the bending force acting on the die plate results from the difference between the pressing forces of the upper and lower punches. In the method according to the invention, a table for the dependence of the deformation of the die plate is created by the applied compressive forces. For setting the delivery of the ram is also essential to know which displacements of the die bore set with different deformations. Therefore, in the method according to the invention during the pressing process from time to time or continuously the pressing force on the punches is measured to determine the respective deformation forces by applying the deformation forces on the table. At a certain deformation value of the die plate includes a predetermined feed path for the ram. It is therefore possible to correct the length of the feed path in accordance with the measurements described with the aid of the method according to the invention during the pressing process. With the help of the invention it is therefore achieved that the upper punch is moved up precisely to the edge of the die bore, but without touching it significantly.
Bei einer Verformung der Matrizenplatte kommt es naturgemäß auch zu einer Relativverlagerung von Unterstempel und Matrizenbohrung. Es ist daher erforderlich, bei der beschriebenen Korrektur des Zustellwegs des Oberstempels den Zustellweg des Unterstempels parallel zu korrigieren.When the die plate is deformed, it is naturally also a matter of relative displacement of the lower punch and the die bore. It is therefore necessary to correct the delivery path of the lower punch parallel to the described correction of the delivery path of the upper punch.
Mit Hilfe des erfindungsgemäßen Verfahrens kann vermieden werden, daß der Oberstempel gegen eine Kante der Matrizenbohrung anfährt, wenn es zu keiner Verformung der Matrizenplatte kommt. Da, wie erwähnt, ständig die Preßkraft gemessen wird, diese jedoch auch bestimmte Werte unterschreiten kann, kann auf diese Weise ermittelt werden, wann die gesamte Preßvorrichtung still zu setzen ist, damit eine Beschädigung von Oberstempel und Matrizenbohrung vermieden wird.With the aid of the method according to the invention, it can be avoided that the upper punch moves against an edge of the die bore if no deformation of the die plate occurs. Since, as mentioned, constantly the pressing force is measured, but this can also fall below certain values, can be determined in this way, when the entire pressing device is to be stopped, so that damage to the upper punch and die bore is avoided.
Bei dem beschriebenen Preßvorgang kommt es nicht nur zu einer Verformung der Matrizenplatte, sondern auch zu einer Stauchverformung von Ober- und Unterstempel. Die Verformungswerte sind ebenso wie die Verformung der Matrizenplatte relativ klein, aber nicht vernachlässigbar. So wird z.B. bei einer Matrizenplatte eine Verformung von einigen pm pro Tonne Preßkraft erhalten. Um bei einer nicht zu vernachlässigenden Stauchung der Preßstempel ebenfalls eine Korrektur vorzunehmen, sieht eine Ausgestaltung der Erfindung vor, daß für eine Reihe von unterschiedlichen Preßkräften an den Stempeln deren Stauchverformung gemessen oder berechnet wird. Die korrelierenden Werte von Stauchverformung und Preßkräften werden tabellarisch in einem Speicher abgelegt. Die Zustellung von Ober- und Unterstempel wird dann nach Maßgabe der Stauchung korrigiert.In the pressing described not only a deformation of the die plate, but also to a compression deformation of upper and lower punches. The deformation values as well as the deformation of the die plate are relatively small, but not negligible. For example, for a die plate, a deformation of a few pm per ton of pressing force is obtained. In order to make a correction also in a non-negligible compression of the ram, an embodiment of the invention provides that for a number of different pressing forces on the punches whose compression deformation is measured or calculated. The correlating values of compression deformation and compression forces are stored in a table in a memory. The delivery of upper and lower stamps will then be corrected according to the compression.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.
- Fig. 1
- zeigt schematisch eine Preßvorrichtungzur Durchführung des Verfahrens nach der Erfindung.
- Fig. 2
- zeigt anhand eine Blockschaltbildes den Betrieb der Preßvorrichtung nach Fig. 1.
- Fig. 1
- shows schematically a pressing device for carrying out the method according to the invention.
- Fig. 2
- shows the block diagram of the operation of the pressing device according to FIG. 1.
Eine in Figur 1 dargestellte Preßvorrichtung 10 weist eine Matrizenplatte 12 auf, mit einer Matrizenbohrung 14, mit der ein Oberstempel 16 und ein Unterstempel 18 zusammenwirken. Die Kraftvorrichtungen, die die Stempel 16, 18 betätigen, sind nicht dargestellt. Sie sind herkömmlich und z.B. hydraulisch wirkend. Es ist mit derartigen Preßvorrichtungen möglich, die Preßtempel im µm-Bereich zu positionieren. Zwischen den nicht gezeigten Kraftvorrichtungen und den Stempeln 16, 18 ist jeweils eine Kraftmeßdose 20 bzw. 22 angeordnet. Die Matrizenplatte 12 ruht auf beanstandeten Auflagern 24, 26.A
Wie zu erkennen, ist der eigentliche Formraum der Matrizenbohrung 14 im Querschnitt konisch bzw. trapezförmig mit zwei Schrägflächen 26. Falls ein kreisrunder Formraum vorliegt, ist naturgemäß nur eine konische Fläche vorhanden. Der Formraum, der in Figur 1 zu erkennen ist, dient z.B. zur Herstellung eines Preßlings aus Metallpulvermaterial zur Herstellung einer Wendeschneidplatte nach dem Sinterverfahren, z.B. für Fräs- oder Bohrwerkzeuge oder dergleichen. Beide Preßstempel 16, 18 fahren in die Bohrung 14 ein, wobei der obere Preßstempel an die Kante 28 heranzufahren ist und damit die Lage der Oberseite des Preßlings vorgibt, während der Unterstempel an die Kante 30 heranzufahren ist, um die Dicke des Preßlings vorzugeben. Während des Preßprozesses wird zunächst der Unterstempel 18 zu einer Befüllposition eingefahren. Dann erfolgt eine Befüllung mit Pulvermaterial. Anschließend wird der Oberstempel 16 betätigt und bis an die Kante 28 herangefahren, um den Preßling durch Pressen zu verformen. Zugleich wir der Unterstempel 18 bis zur Kante 30 gefahren.As can be seen, the actual mold cavity of the
Aufgrund der unterschiedlich zu verpressenden Querschnitte von Ober- und Unterstempel 16, 18 wird ein Differenzdruck auf die Matrizenplatte 12 aufgebracht, und die Matrizenplatte wird zwischen den Auflagern 24, 26 durchgebogen und gestaucht, wie deutlich und übertrieben in Figur 1 gezeigt. Diese Verformung der Matrizenplatte 12 bedingt nun, daß der Oberstempel 16 weiter in der Matrizenbohrung 14 hineingefahren werden muß als bei unverformter Matrizenplatte 12, um die Kante 28 zu erreichen. Dieser Verstellweg ist abhängig von der jeweiligen Verformung der Matrizenplatte 12, die wiederum von der Differenzkraft an der Matrizenplatte abhängt.Due to the differently to be compressed cross-sections of upper and
Aus den Blockschaltbild aus Figur 2 geht die Verfahrensweise der Preßvorrichtung 10 nach Figur 1 deutlich hervor. In einem Rechner 30 ist tabellarisch die Funktion zwischen der Verformungskraft an der Matrizenplatte 12 und der dadurch hervorgerufenen Verformung abgelegt. Genauer gesagt, ist die Verlagerung der Matrizenbohrung bzw. der Kante 28 relativ zur Verformungskraft abgelegt. Die Ermittlung dieser Beziehung kann mit Hilfe geeigneter Messungen oder Berechnungen geschehen, bevor die Produktion beginnt. Das zu verpressende Pulvermaterial ist bekannt und auch die Dichte, die für den Preßling gefordert ist. Mithin läßt sich die Verformung der Matrizenplatte bei den einzelnen Verformungskräften, die aus der Differenz der Preßkräfte der Stempel 16, 18 gebildet werden, ermitteln.From the block diagram of Figure 2, the procedure of the
Während des Preßvorgangs werden ständig oder intermittierend mit Hilfe der Kraftmeßdosen 20, 22 die an den Preßstempeln 16, 18 wirkenden Preßkräfte gemessen und aus Ihnen die Verformungskraft berechnet. Im Rechner 30 wird die dazugehörige Verformung der Matrizenplatte 12 ermittelt bzw. die Verlagerung der Kante 28 der Matrizenplatte 12. Der Rechner 30 übermittelt daraus den Zustellweg des Preßstempels 16 und gibt auf eine Steuervorrichtung 32 ein entsprechendes Positioniersignal für Kraftglieder 34 bzw. 36 für die Preßstempel 16, 18. Auf diese Weise ist es möglich, unabhängig von den Ausmaß der Verformung der Matrizenplatte 12 mit dem Oberstempel 16 exakt die Kante 28 und mit dem Unterstempel 18 die Kante 30 anzufahren. Denn bei einer Verformung der Matrizenplatte 12 findet auch eine Relativverlagerung von Unterstempel 18 und Matrizenplatte 12 statt, und der Unterstempel 18 ist vom Kraftglied 36 entsprechend zu positionieren, damit er an der Kante 30 verbleibt.During the pressing operation, the pressing forces acting on the press dies 16, 18 are constantly or intermittently measured with the help of the
Falls bei der Messung der Preßkräfte ein zu geringer Wert auftritt, erzeugt der Rechner 30 ein Abschaltsignal für die Preßvorrichtung 10. Dadurch wird eine Beschädigung von Stempel und Matrizenplatte vermieden.If too small a value occurs during the measurement of the pressing forces, the
Claims (4)
- A process for compacting powdered material to form a compact of a predetermined thickness and having at least one lateral oblique surface by means of a bore in a die plate for receiving the powdered material and an upper ram and a lower ram, which are operable by means of a hydraulic power-exerting device and are positionable by means of a control device with respect to the die plate, comprising the following steps:- the deformations of the die plate are measured or calculated for various deformation forces and the correlating values are filed as a table in a memory with the deformation forces being determined from the difference of the compacting forces of the two rams,- during the compaction procedure the compacting forces of the two rams are measured and the deformation forces are calculated therefrom by applying the deformation force measured to the table and- the feed length of the up-per and lower rams is corrected depending on deformation.
- The process as claimed in claim 1, characterized in that the deformation force is continuously determined during the compaction procedure.
- The process as claimed in claim 1 or 2, characterized in that the power-exerting device is turned off when the compacting forces or deformation force are below predetermined values.
- The process as claimed in any one of claims 1 to 3, characterized in that the upsetting deformation is measured or calculated for a number of different compacting forces on the rams and the correlating values are filed as a table in a memory and that the feed length of the upper and lower rams is corrected depending on the upsetting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10135283A DE10135283C2 (en) | 2001-07-19 | 2001-07-19 | Process for pressing powder material |
| DE10135283 | 2001-07-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1277564A2 EP1277564A2 (en) | 2003-01-22 |
| EP1277564A3 EP1277564A3 (en) | 2004-01-28 |
| EP1277564B1 true EP1277564B1 (en) | 2006-09-13 |
Family
ID=7692423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02015132A Expired - Lifetime EP1277564B1 (en) | 2001-07-19 | 2002-07-06 | Method of compacting powder materials |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6827889B2 (en) |
| EP (1) | EP1277564B1 (en) |
| AT (1) | ATE339298T1 (en) |
| DE (2) | DE10135283C2 (en) |
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|---|---|---|---|---|
| US7708702B2 (en) * | 2006-01-26 | 2010-05-04 | Roche Diagnostics Operations, Inc. | Stack magazine system |
| DE102008035301B3 (en) * | 2008-07-29 | 2010-03-25 | Fette Gmbh | powder Press |
| JP5032690B1 (en) | 2011-07-27 | 2012-09-26 | 住友電気工業株式会社 | Compacted body |
| DE102013201312A1 (en) * | 2013-01-28 | 2014-07-31 | Robert Bosch Gmbh | Core for inductor, has two parallel legs which are connected by yoke, and are arranged facing bottom portion and facing away from top portion |
| US12491693B2 (en) | 2019-09-27 | 2025-12-09 | Korsch Ag | Device and method for monitoring a tablet press machine, preferably during continuous operation, by means of a measuring device attached to a press punch |
| CN113619177B (en) * | 2021-07-07 | 2023-06-30 | 浙江明恩新材料科技有限公司 | Production equipment of high-temperature-resistant modified material product |
| CN115093199B (en) * | 2022-06-30 | 2023-12-22 | 青海天蓝新能源材料有限公司 | Special refractory crucible for carbonization of negative electrode material and manufacturing process thereof |
| CN117900475B (en) * | 2024-01-15 | 2025-05-27 | 湖南良诚新材料科技有限公司 | Cold pressing device for diamond saw blade machining |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2951716A1 (en) * | 1979-12-19 | 1981-07-02 | Mannesmann AG, 4000 Düsseldorf | Pressing system to compensate for fluctuations - measures displacement of powder in mould simultaneously with pressure |
| JPS579600A (en) * | 1980-06-19 | 1982-01-19 | Yoshitsuka Seiki:Kk | Press and detecting method of its abnormal pressing force |
| DE3520203A1 (en) * | 1985-06-05 | 1986-12-11 | Wilhelm Fette Gmbh, 2053 Schwarzenbek | ROTARY ROTARY TABLETING MACHINE AND METHOD FOR CONTROLLING YOUR PRINT ROLLERS |
| DE3823417A1 (en) * | 1988-07-11 | 1990-01-18 | Fette Wilhelm Gmbh | METHOD AND DEVICE FOR MONITORING THE PRESSING FORCE OF THE STAMP OF A TABLET PRESS |
| DE3919821C2 (en) * | 1989-06-15 | 1994-04-07 | Mannesmann Ag | Method and device for producing dimensionally stable compacts |
| JP2747082B2 (en) * | 1990-04-26 | 1998-05-06 | 新日本製鐵株式会社 | How to find the coefficient of friction during powder molding |
| US5211964A (en) * | 1991-05-20 | 1993-05-18 | Westinghouse Electric Corp. | Press machine with means to adjust punching force |
| JPH07110438B2 (en) * | 1991-07-01 | 1995-11-29 | 株式会社ヨシツカ精機 | Method and apparatus for controlling pressure of powder molding press |
| DE19717217C2 (en) * | 1997-04-24 | 1999-12-02 | Fette Wilhelm Gmbh | Method and device for producing compacts from hard metal, ceramic, sintered metal or the like |
| DE19846210A1 (en) | 1998-10-07 | 2000-04-13 | Dorst Masch & Anlagen | Press for the production of moldings |
| DE19919693C2 (en) * | 1999-04-30 | 2001-08-23 | Fette Wilhelm Gmbh | Method for determining the position of a ram of a powder press |
| DE10010671C2 (en) * | 2000-03-04 | 2002-03-14 | Fette Wilhelm Gmbh | Process for producing pressed parts by pressing metal powder and then sintering the compact |
-
2001
- 2001-07-19 DE DE10135283A patent/DE10135283C2/en not_active Expired - Fee Related
-
2002
- 2002-07-06 EP EP02015132A patent/EP1277564B1/en not_active Expired - Lifetime
- 2002-07-06 AT AT02015132T patent/ATE339298T1/en active
- 2002-07-06 DE DE50208114T patent/DE50208114D1/en not_active Expired - Lifetime
- 2002-07-13 US US10/194,581 patent/US6827889B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1277564A3 (en) | 2004-01-28 |
| US20030024418A1 (en) | 2003-02-06 |
| EP1277564A2 (en) | 2003-01-22 |
| ATE339298T1 (en) | 2006-10-15 |
| US6827889B2 (en) | 2004-12-07 |
| DE50208114D1 (en) | 2006-10-26 |
| DE10135283A1 (en) | 2003-02-20 |
| DE10135283C2 (en) | 2003-09-18 |
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