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WO2000020192A1 - Presse pour produire des corps moules - Google Patents

Presse pour produire des corps moules Download PDF

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Publication number
WO2000020192A1
WO2000020192A1 PCT/EP1999/007330 EP9907330W WO0020192A1 WO 2000020192 A1 WO2000020192 A1 WO 2000020192A1 EP 9907330 W EP9907330 W EP 9907330W WO 0020192 A1 WO0020192 A1 WO 0020192A1
Authority
WO
WIPO (PCT)
Prior art keywords
stroke
press
die
ram
distance
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.)
Ceased
Application number
PCT/EP1999/007330
Other languages
German (de)
English (en)
Inventor
Hubert Schaidl
Gerhard Moser
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.)
DORST Technologies GmbH and Co KG
Original Assignee
DORST Technologies GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DORST Technologies GmbH and Co KG filed Critical DORST Technologies GmbH and Co KG
Publication of WO2000020192A1 publication Critical patent/WO2000020192A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload pressure
    • 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 present invention relates to a press for producing molded articles by compacting, for example, powdery or granular material. After being processed by the press, such shaped bodies can also be subjected to a sintering process to form a ceramic body.
  • a press for producing molded articles in which a die for receiving the material to be compressed, a ram to be moved from above onto the material to be compressed and a ram to be moved from below onto the material to be compressed are attached to a press frame.
  • the upper ram is first brought into a closed position, and then the lower ram is moved toward the upper ram, the die also making a movement in a direction of motion common to the lower ram.
  • the invention is based on a press with a press frame and a drive for a press ram fixed to the press frame for exerting a pressing force on the shaped body, a stamp carrier fixed to the press ram being fixed on the driven side of the drive.
  • the design of the finished molded body is determined on the one hand by an end face of the press die, and on the other hand it is determined by an arrangement which comprises at least one die attached to the press frame, which receives the molded body during the pressing process and from which the finished molded body closes is expelled.
  • a control device is provided which changes the stroke of the drive.
  • the invention is based on the idea of performing the most accurate determination of the actual position of a stamp end with respect to the shape of the finished molded part, on the other hand, in order to achieve a well-defined dimensioning of the molded part and, on the other hand, the mutual damage of the stamp and die to avoid.
  • this is a direct determination the position of the press ram is difficult, since it penetrates into the die and transmits the pressing pressure, which may reach material loading limits, to the material, so that mounting measuring sensors directly on the ram is problematic.
  • a further compression process can be terminated if the determination of the position of the stamp end indicates an approach to a target value.
  • a distance measuring device is provided on the press, which delivers a distance signal which corresponds to a distance between a predetermined location on the stamp carrier and a predetermined location on the arrangement which also determines the shape of the molded body produced, the control device controlling the stroke of the drive as a function of that Distance signal changes. Via the distance signal, the control device thus receives information indicating the actual position of the punch end as a good approximation, which is why precise actuation of the drive or change in the stroke of the drive is then possible, essentially independent of expansion or compression of the press frame or other components .
  • the predetermined location is advantageously arranged on the arrangement on the die which also determines the shape of the molded body produced. It is thus possible to manufacture the areas of the finished shaped body, which are essentially determined by the interaction of the die and the end face of the press die, with particular precision. Furthermore, it is also possible to avoid mutual damage between the ram and the die. It is advantageously provided that the arrangement which also determines the shape of the molded body produced comprises a second press die which exerts a further press force on the shaped body, which is oriented at an angle of in particular 180 degrees to the press force of the first press die.
  • the predetermined location on the arrangement determining the shape of the molded body produced is then arranged on the second stamp carrier.
  • This target distance signal can be determined, for example, by moving the press die by the drive to the desired target end position of the die end with respect to the die or the end face of the second press die in its target end position before the actual pressing operation, and in this case by the distance signal supplied to the distance measuring device is used as the desired distance signal.
  • the drive advantageously comprises a long-stroke drive stage fixed on the press frame, on the output side of which a short-stroke drive stage is fixed, on the output side of which the stamp carrier is in turn fixed.
  • the pressing force can be increased by increasing the respective stroke of the two drive stages, and the control device changes the stroke of the long-stroke drive stage and / or the stroke of the short-stroke drive stage Dependence on the distance signal.
  • the long-stroke drive stage can essentially be used to close the mold and the short-stroke drive stage can be used for precisely controlled and metered approach to an end position of the die end.
  • the stroke of the short-stroke drive stage can be adjusted more precisely than the stroke of the long-stroke drive stage, it is advantageous to first set the long-stroke drive stage to a predetermined stroke position in order to apply a final pressure to the molded body, and then to change the stroke of the short-stroke drive stage depending on the distance signal .
  • a stroke measuring device which delivers a stroke signal corresponding to the stroke of the short-stroke drive stage, the control device for applying a final pressure to the molded body first setting the large-stroke drive stage to a predetermined stroke position and changing the stroke of the short-stroke drive stage as a function of the stroke measurement signal .
  • the predetermined stroke position of the long-stroke drive stage can be set precisely and reproducibly, the stroke signal already provides a relatively precise measure of the position of the punch end with respect to the shape.
  • the control device then changing the stroke of the short-stroke drive stage until the stroke measuring device delivers the desired stroke signal.
  • the stroke measuring device is used for the precise setting of a closed position of the die, the desired stroke signal then indicating the position from which the compression process begins.
  • An advantageous embodiment of the invention provides as a long-stroke drive stage a tied-off press gear, in particular a cam gear and / or a thrust crank gear. Such a transmission allows a particularly precise setting and reproducibility of the previously described predetermined stroke position of the long stroke drive stage when this predetermined stroke position is a position of maximum stroke of the drive stage.
  • an advantageous embodiment of the invention provides a hydraulic piston-cylinder device in particular as a short-stroke drive stage, the stroke measuring device described above then advantageously detecting the position of the piston of the piston-cylinder device with respect to the cylinder of the piston-cylinder device, since the stroke measuring device then delivers a stroke signal which corresponds particularly precisely to the actual stroke of the short-stroke drive stage.
  • the change in the stroke of the short-stroke drive stage is advantageously carried out by changing the supply and / or discharge of a pressure fluid to the piston-cylinder device, the stroke measurement signal then advantageously being able to be used as a control variable for setting a desired stroke of the drive stage.
  • a pressure measuring device which delivers a pressure signal corresponding to a pressure of the pressure fluid supplied to the piston-cylinder device.
  • the control device can then also change the stroke of the small-stroke drive stage as a function of the pressure signal.
  • control device comprises a protective device which increases the stroke of the large-stroke and / or the small-stroke gen drive stage, ie a further increase in pressure, then prevented when the pressure measuring device signals a pressure exceeding a predetermined limit pressure. In this way, overloading and any accompanying deformation of components of the press can be avoided.
  • control device has a further protective device which makes an increase in the stroke dependent on an increase in pressure, since during the production of a shaped body, i.e. in the compression of the starting material, an increase in pressure is accompanied by a characteristic increase in stroke. If, for example, a misalignment of the press rams comes into contact with the die, or if a faulty amount of starting material is poured into the die, there will be a deviation from this characteristic stroke increase, which can be recognized as an error. The control device can then prevent a further increase in the stroke.
  • the present invention is advantageously used for the production of moldings which have a surface formed by a wall of the die, which extends at an acute angle to a surface of the molded body formed by the stamp end surface.
  • the production of particularly sharp-edged moldings is facilitated.
  • FIG. 1 is a side view of a schematic press according to the present invention and a schematic representation of a control system for this press
  • Fig. 2 is an enlarged view of a die of the one shown in Fig. 1 Press, and
  • FIG. 3 shows a representation corresponding to FIG. 1 of a further embodiment of the invention.
  • a press 1 shown in Fig. 1 comprises a press frame 3 from a base plate 5, two with their ends attached to the base plate 5 and perpendicular to the base plate 5 and parallel to each other extending spars 7, which are rigidly connected to each other at their other ends by a connecting plate 9 are connected.
  • a tool traverse 11 is movably guided on the spars 7.
  • the die 13 is supported by rods 20 with respect to the base plate 5 and is firmly connected to the press frame 3.
  • the die 13 has a cavity 15, which can be seen in FIG. 2, for receiving the starting material for the molded body to be produced.
  • FIG. 2 An upper ram 17 and a lower ram 19 lead from above to the cavity 15, the two rams 17, 19 each being movable along an axis 61.
  • the upper press ram 17 has a larger cross section than the lower press ram 19.
  • the two press rams 17, 19 are also shown in an end position of the compression process, the cross section of the die being continuously different an end face 21 of the upper press ram 17 tapers towards an end face 23 of the lower press ram 19.
  • the cavity 15 thus has a trapezoidal cross section in the illustration in FIG. 2, the side walls 25 and 27 of the die 13 each enclosing an acute angle ⁇ with the flat end face 21 of the upper press ram 17.
  • the shaped body produced with this arrangement of die 13 and upper and lower press rams 17, 19 also has a trapezoidal shape in cross section, for example this shaped body may be made of ceramic material.
  • rial manufactured indexable insert This indexable insert then has a cutting edge with the acute angle ⁇ on its cutting surface. In order to produce this cutting edge as precisely as possible, it is necessary for the upper press ram 17 to be brought as close as possible to the end position of the upper press ram 17 shown in FIG. 2 during the pressing process. If the upper ram 17 is not sufficiently close to this end position from above, the resulting indexable insert does not have the desired acute-angle transition on its cutting edge.
  • an adjusting device 31 for example an electric motor
  • the upper press ram 17 is actuated by a two-stage drive mechanism 33 arranged between the base plate 11 and the connecting plate 9.
  • the first drive stage comprises a toggle lever mechanism 35 with a drive shaft 39 mounted on the bars 7 of the press frame 3 and driven by an adjusting device 37, for example an electric motor, which carries an eccentric 41, on the eccentric end of which two crank rods 43 are articulated.
  • the other ends of the crank rods 43 are articulated on a guide cross member 47 which is displaceably mounted in the longitudinal direction of the cross members 7 on the cross members 7, so that a rotary movement of the drive shaft 39 of the toggle lever mechanism 35 leads to a displacement of the guide cross member 47 of the toggle lever mechanism 35 with respect to the press frame 3 and along the Axis 61 leads.
  • the guide cross member 47 carries a piston 49 of a piston-cylinder unit 51, which forms the second drive stage.
  • a piston 53 which is movable parallel to the direction of movement of the guide cross member 47 with respect to the press frame 3 and which is fixedly connected via a piston rod 55 to a stamp carrier 57 arranged between the guide cross member 47 and the base plate 11.
  • the punch support 57 is guided on two guide bars 59 which extend parallel to the bars 7 of the press frame 3 and are fastened to the base plate 11, so that the upper press punch 17 fixedly connected to the punch carrier 57 can be moved along the axis 61.
  • the piston-cylinder unit 51 has two supply and discharge lines 63 for a hydraulic fluid, the position of the piston 53 in the cylinder 49 being adjustable via this hydraulic fluid.
  • the supply and discharge of the hydraulic fluid to the piston-cylinder unit 51 is actuated by an electrically operated hydraulic valve 65, which is also connected to a fluid reservoir 67 and a hydraulic fluid pump 69.
  • the toggle lever mechanism 35 has a longer actuation range or stroke than the piston-cylinder unit 51.
  • the toggle lever mechanism 35 as a long-stroke drive stage and the piston-cylinder unit 51 as a short-stroke drive stage are actuated by actuating the electric motor 37 or actuating the hy Draulikventils 65 set in motion, the control of the motor 37 and the hydraulic valve 65 is carried out by an electrical control 71.
  • a distance sensor 73 is attached to the stamp carrier 57, which detects the distance between the stamp carrier 57 and the die 13.
  • the distance sensor 73 provides a distance signal 74, which is fed to the controller 71.
  • a stroke sensor 75 is attached to the cylinder 49 of the piston-cylinder unit 51 and detects the position of the piston 53 with respect to the cylinder 49 and thus the instantaneous stroke of the piston-cylinder unit 51.
  • the stroke sensor 75 provides a stroke signal 76, which is also fed to the controller 71.
  • the lower press ram 19 In order to fill the cavity 15 of the die 13 with the powdery material to be compressed into the molded body, the lower press ram 19 is positioned in a filling position slightly retracted from the end position shown in FIG. 2, namely by actuating the adjusting device 31 of the drive mechanism 29.
  • the upper press ram 17 is so far away from the die 13 by actuating the electric motor 37 of the long-stroke toggle lever mechanism 35 that easy access to the cavity 15 for filling the same with the powdery material is possible.
  • the die 13 After filling with the powdery material, the die 13 is essentially closed by actuating the long-stroke toggle lever mechanism 35, in that the upper punch 17, which is guided over the punch carrier 57 on the guide rails 59 with respect to the die 13, is brought into engagement with the die 13, whereby the piston 53 in the cylinder 49 is held in a retracted position, ie in a position in which the piston 53 is located within the cylinder 49 away from the die 13.
  • the lower die 19 is moved toward the upper die 17 by operating the drive mechanism 29, and the upper die 17 is moved toward the lower die 19 by operating the piston-cylinder unit 51. This leads to compression of the powdery material and to the production of the shaped body.
  • the molded body can be ejected from the die 13 after the upper press ram 17 has been pulled back, for example by further actuation of the lower press ram 19.
  • the controller 71 moves the toggle 35 to a maximum stroke position, i.e. in a position in which the guide cross member 47 is the most distant from the drive shaft 39 and thus assumes its position closest to the die 13.
  • This position of maximum strokes can be precisely adjusted and easily repeated in the toggle lever mechanism 35 used.
  • the end face 21 of the upper ram 17 is at the beginning of the compression process at a well-defined distance from the end position of the compression process shown in FIG.
  • the control 71 moves the piston 53 in the cylinder 49 towards the die 13 by actuating the hydraulic valve 65, by continuously increasing the stroke of the piston-cylinder unit 51.
  • the stroke of the piston-cylinder unit 51 is regulated by the controller 71 by monitoring the stroke signal output by the stroke sensor 75.
  • the controller 71 ends the compression movement carried out by the piston-cylinder unit 51 when the distance signal output by the distance sensor 73 and supplied to it reaches a previously set target value.
  • This setpoint was determined in advance by moving the toggle lever mechanism 35 into its position when the die 13 was not filled with powdered material maximum strokes was brought and then the upper press ram 17 was actuated by actuating the piston-cylinder unit 51 to the end position shown in Figure 2, with a continuous control, for example by eye, to prevent mutual damage to the upper press ram 17 and the die 13 to avoid.
  • the distance signal 74 emitted by the distance sensor 73 after the upper press ram 17 has approached this end position is then stored in the controller 71 as the desired distance signal.
  • the press 1 can thus be used to produce particularly precise indexable inserts with a sharp cutting edge, since the compression process of the shaped body is not ended as a function of a maximum pressure, but rather as a function of a predetermined end position of the end face 21 of the upper die 17. Furthermore, mutual damage between the die 13 and the upper press ram 17 is prevented in this press, for example, when too little powdery material has been filled into the die 13 due to a filling error.
  • the distance signal 74 output by the distance sensor is used to determine the end of the compression process and the distance sensor detects the distance between the punch carrier 57 and the die 13, the accuracy of reaching the intended end position of the end face 21 of the upper press punch 17 is not due to compressive stress-related expansions or compressions of the press frame 3, the components of the toggle mechanism 35, the components of the piston-cylinder unit 51 including the piston rod 55. Only the compression of the upper ram 17 itself and part of the ram 57 due to the application of pressure could falsify the end position actually reached. However, since the distance between the punch carrier 57 and the end face 21 is chosen to be small and the cross section of the upper press punch 17 is designed to be as strong as possible, this falsification is minor. Furthermore, this falsification can also be compensated to a certain extent by the fact that this compression of the pressing stempeis 17 and the part of the stamp carrier 57 is correctively taken into account.
  • the press 1 has a pressure measuring device 77 which monitors the pressure of the hydraulic fluid in the supply line 63 to the piston-cylinder unit 51 and outputs a pressure signal 78 corresponding to this pressure to the control device 71. If the pressure in this supply line exceeds a predetermined limit pressure at which the control 71 receives a pressure signal 78 corresponding to this limit pressure, the control 71 ends the compression process and, if necessary, emits a corresponding warning signal. This prevents overloading of components of the press 1, for example as a result of incorrect operation.
  • the controller 71 continuously monitors the change in the pressure signal 78 and the change in the distance signal 74 during the compression process and, if appropriate, ends the compression process with a warning signal if the pressure increases too much when the change in the distance signal 74 is too small. This indicates that the press is blocked, for example, by contact between the upper ram 17 and the die 13.
  • This safety measure can also be carried out by monitoring the ratio of pressure change and stroke change of the piston-cylinder unit 51.
  • Modifications of the distance sensors delivering the distance signal 74 are also conceivable here.
  • a modified distance sensor can detect the distance between the stamp carrier and the base plate or another point on the press frame, or the position sensor can detect the distance between, for example, the piston rod 55 and the die or another location on the press frame.
  • Stroke sensor 75 such a distance sensor, since it provides a measure of the actual position of the punch end with respect to the die.
  • the further press die 19 can also be provided with a device for detecting the position of its die end 23 with respect to the die 13.
  • piston-cylinder unit it is conceivable to use a different drive for the short-stroke drive stage, for example crank gears or other gears whose stroke is adjustable.
  • a piston-cylinder unit can also be used as the long-stroke drive stage.
  • the die in which the die 13 is fixedly connected to the press frame via the rods 20, the die can also be movably mounted to the press frame and by a further drive relative to the upper press ram 17 or ⁇ and the lower press ram 19 be movable to achieve a particularly homogeneous compression of the molded body.
  • the control device can also change the stroke of the further drive as a function of the distance signal in order to increase the precision of the molded body produced or to avoid mutual damage to the die and punch.
  • FIGS. 1 and 2 A variant of the press shown in FIGS. 1 and 2 is explained below. Components which correspond to one another with regard to their structure and function are identified by the reference numbers from FIGS. 1 and 2, but are provided with a letter to distinguish them. For explanation, reference is made to the entire preceding description.
  • the press la shown in FIG. 3 has a die 13a, the upper punch and the die 13a can be moved relative to a press frame 3a by means of a common main drive. Furthermore, in contrast to the embodiment explained above, in the press la shown in FIG. 3, a lower press ram 19a is fixed on a lower punch support 58, which in turn is fixed on the frame 3a.
  • the press 1a is particularly suitable for producing moldings whose height has particularly low tolerances.
  • the height of the molded body is essentially determined by the distance between the facing end faces of the two press rams 17a and 19a when the final pressure is applied to the molded body.
  • the press 1a has a distance measuring device 73a which detects the distance between the punch carrier 57a of the upper press punch 17a and the punch carrier 58 of the lower press punch 19a and a distance signal 74 indicating this distance the control device 71a delivers.
  • the control device 71a then changes the stroke of the drive mechanism 33a for the upper press ram 17a in order to apply the final pressure to the shaped body such that when the final pressure is applied to the shaped body, the distance measuring device 73a supplies a distance signal 74 which corresponds to a predetermined desired distance signal.
  • the desired distance signal was selected in advance such that it is emitted by the distance measuring device 73a when the mutually facing end faces of the press rams 17a and 19a essentially take the distance from one another which corresponds to the desired height of the molded articles to be produced.
  • the reference symbol 31a denotes an angle transmitter in FIG. 3, which indicates the position and assigns the paths.
  • both the distance between the punch carrier of the upper press die and the die and the distance between the punch carrier of the upper press ram and the punch carrier of the lower ram are each detected by their own distance measuring device.
  • the control device is then supplied with two distance signals, the control device being able to change the change in the drive for the upper press ram or / and the stroke of the drive for the lower press ram as a function of the two distance signals.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

L'invention concerne une presse pour produire des corps moulés, présentant un bâti (3) et un premier élément d'entraînement (35, 51) fixé sur le bâti, destiné à un premier poinçon (17) servant à exercer une force de pression sur le corps moulé. Un premier support de poinçon (57) raccordé de manière fixe au premier poinçon (17) est fixé côté sortie (44) du premier élément d'entraînement (35, 51). En outre, la presse comprend d'une part un dispositif (13, 19) participant à l'élaboration de la forme du corps moulé produit et présentant au moins une matrice (13) montée sur le bâti (3), et d'autre part une unité de commande (71) faisant varier la course du premier élément d'entraînement (35, 51). Cette presse est caractérisée en ce qu'un dispositif de mesure de distance (73) fournit un signal de distance (74) correspondant à la distance entre un point prédéterminé sur le support de poinçon (57) et un point prédéterminé sur le dispositif (13, 19) participant à l'élaboration de la forme du corps moulé, et en ce que l'unité de commande (71) fait varier la course du premier élément d'entraînement (35, 51) en fonction du signal de distance (74).
PCT/EP1999/007330 1998-10-07 1999-10-04 Presse pour produire des corps moules Ceased WO2000020192A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998146210 DE19846210A1 (de) 1998-10-07 1998-10-07 Presse zum Herstellen von Formkörpern
DE19846210.7 1998-10-07

Publications (1)

Publication Number Publication Date
WO2000020192A1 true WO2000020192A1 (fr) 2000-04-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/007330 Ceased WO2000020192A1 (fr) 1998-10-07 1999-10-04 Presse pour produire des corps moules

Country Status (2)

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DE (1) DE19846210A1 (fr)
WO (1) WO2000020192A1 (fr)

Cited By (3)

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EP1048450A3 (fr) * 1999-04-30 2002-09-04 Fette GmbH Procédé pour déterminer la position d'un poinçon dans une presse à poudre
US6827889B2 (en) 2001-07-19 2004-12-07 Fette Gmbh Process for compacting powdered material
EP1541327A4 (fr) * 2002-07-15 2005-10-05 Mitsubishi Materials Techo Cor Procede et systeme de compactage de poudre

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DE10142773C1 (de) * 2001-08-31 2003-03-06 Fette Wilhelm Gmbh Hydraulische Presse zum Pressen von Metallpulver
EP1308268B1 (fr) * 2001-11-06 2007-01-10 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
DE10212315B4 (de) * 2002-03-20 2004-04-29 Wilhelm Fette Gmbh Wegmeßsystem für eine Pulverpresse
DE10301224A1 (de) * 2003-01-15 2004-08-05 Maschinenfabrik Lauffer Gmbh & Co Kg Verfahren zur Endpositionsregelung einer Presse für maßgenaue Formkörper
DE10342645A1 (de) 2003-09-16 2005-04-07 Komage-Gellner Maschinenfabrik Kg Presse für die Herstellung von Formlingen aus pulverförmiger Masse
DE102015205539A1 (de) * 2015-03-26 2016-09-29 Bundesdruckerei Gmbh Verfahren und Vorrichtung zum Laminieren eines mehrschichten Sicherheits-Dokumentkörpers mit Deformationsüberwachung
EP3530445A1 (fr) * 2018-02-26 2019-08-28 Osterwalder AG Presse à poudre à entraînement à levier à genouillère

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GB2053074A (en) * 1979-06-19 1981-02-04 Schlegel Walter Press with improved control over the thickness of pressed compacts
DE2951716A1 (de) * 1979-12-19 1981-07-02 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum pressen von formkoerpern
DE3507327A1 (de) * 1985-03-01 1986-09-04 Jörg 8607 Hollfeld Lange Exzenter-hydraulikpresse
EP0403038A2 (fr) * 1989-06-15 1990-12-19 MANNESMANN Aktiengesellschaft Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes
EP0538582A1 (fr) * 1991-09-24 1993-04-28 Aida Engineering, Ltd. Presse
WO1993009939A1 (fr) * 1991-11-15 1993-05-27 Laeis-Bucher Gmbh Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs
EP0679503A1 (fr) * 1994-04-27 1995-11-02 Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. Procédé pour fabriquer des pièces moulées à partir de matières pulvérulentes et presse correspondante
EP0873855A2 (fr) * 1997-04-24 1998-10-28 Fette, Wilhelm Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire

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DE3930475A1 (de) * 1989-09-12 1991-03-14 Dorst Masch & Anlagen Presse zur herstellung masshaltiger presslinge aus pulverfoermigem material
DE4336745C2 (de) * 1993-10-28 1995-10-12 Manfred Gillenberg Einrichtung an einer Presse für die Herstellung von Formlingen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031788A (en) * 1978-10-19 1980-04-30 Ptx Pentronix Apparatus and method for compacting prismatic or pyramidal articles from powder material
GB2053074A (en) * 1979-06-19 1981-02-04 Schlegel Walter Press with improved control over the thickness of pressed compacts
DE2951716A1 (de) * 1979-12-19 1981-07-02 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum pressen von formkoerpern
DE3507327A1 (de) * 1985-03-01 1986-09-04 Jörg 8607 Hollfeld Lange Exzenter-hydraulikpresse
EP0403038A2 (fr) * 1989-06-15 1990-12-19 MANNESMANN Aktiengesellschaft Procédé et dispositif pour fabriquer des articles pressés à dimensions exactes
EP0538582A1 (fr) * 1991-09-24 1993-04-28 Aida Engineering, Ltd. Presse
WO1993009939A1 (fr) * 1991-11-15 1993-05-27 Laeis-Bucher Gmbh Procede de commande et/ou de reglage du processus de moulage d'une machine a blocs
EP0679503A1 (fr) * 1994-04-27 1995-11-02 Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. Procédé pour fabriquer des pièces moulées à partir de matières pulvérulentes et presse correspondante
EP0873855A2 (fr) * 1997-04-24 1998-10-28 Fette, Wilhelm Procédé et dispositif pour la fabrication pièces moulées en métal dur, céramique, métal fritté ou similaire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1048450A3 (fr) * 1999-04-30 2002-09-04 Fette GmbH Procédé pour déterminer la position d'un poinçon dans une presse à poudre
US6827889B2 (en) 2001-07-19 2004-12-07 Fette Gmbh Process for compacting powdered material
EP1541327A4 (fr) * 2002-07-15 2005-10-05 Mitsubishi Materials Techo Cor Procede et systeme de compactage de poudre

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