EP0451172B1 - Dispositif de commande dans le temps de la pression de remplissage d'outils de moulage par compression - Google Patents

Dispositif de commande dans le temps de la pression de remplissage d'outils de moulage par compression Download PDF

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Publication number
EP0451172B1
EP0451172B1 EP90900757A EP90900757A EP0451172B1 EP 0451172 B1 EP0451172 B1 EP 0451172B1 EP 90900757 A EP90900757 A EP 90900757A EP 90900757 A EP90900757 A EP 90900757A EP 0451172 B1 EP0451172 B1 EP 0451172B1
Authority
EP
European Patent Office
Prior art keywords
pressure
control device
threshold
filling
filling pressure
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.)
Expired - Lifetime
Application number
EP90900757A
Other languages
German (de)
English (en)
Other versions
EP0451172A1 (fr
Inventor
Lutz Beyer
Peter Kluge
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0451172A1 publication Critical patent/EP0451172A1/fr
Application granted granted Critical
Publication of EP0451172B1 publication Critical patent/EP0451172B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/021—Feeding the unshaped material to moulds or apparatus for producing shaped articles by fluid pressure acting directly on the material, e.g. using vacuum, air pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0286—Trimming

Definitions

  • the invention relates to a control device for timing the filling pressure when filling a pressing tool with a pasty or slip-like mass, in particular for the production of oxide magnets, according to the preamble of the main claim.
  • a control device of the aforementioned type is known.
  • the aim here is to have a timing element when the maximum filling pressure is reached switch on, which maintains the filling pressure during its hold time. This takes place in that when a pressure setpoint is reached, the filling pressure is adjusted to the setpoint during this holding time.
  • a complex hydraulic control device is required for this. If, on the other hand, one would dispense with a control device and specify the pump pressure as the maximum filling pressure, the triggering of the holding time by comparing the setpoint is too uncertain, since the setpoint for the maximum filling pressure may not be reached due to pressure fluctuations.
  • the control pressure with the features of the main claim the filling pressure holding time is adhered to very precisely, without having to specify exact threshold values.
  • the first threshold value can be chosen between the flow pressure and the filling pressure, so it is possible that it can also be set relatively far below the filling pressure, so that a reliable triggering of the timing element is possible in any case. Nevertheless, this triggering takes place exactly when the filling pressure is reached.
  • the second threshold value also does not need to be defined exactly and is only chosen to be smaller than the time differential quotient of the pressure rise between flow pressure and filling pressure.
  • a piezo or strain gauge probe is preferably used to measure the pressure during the pressing process, preferably at the die entrance. Together with a downstream voltage amplifier, these probes produce an electrical signal curve that is strictly proportional to the pressure curve.
  • the voltage amplifier is designed as an integrating amplifier element, while in the other case integrating properties are not required.
  • an appropriately composed pasty or slurry-like mass is fed from a mass pump, not shown, via a filling line 10 to a pressing tool 11.
  • a mass check valve 12 in the filling line 10 from which a mass filling channel 13 provided with a pressure sensor 14 runs to the pressing tool 11.
  • This consists of an essentially cylindrical die 15, which is closed at one end by a piston-like movable lower punch 16 and at the other end by an upper punch 17.
  • the pressing space that determines the shape of the product to be manufactured is formed.
  • the mass filling channel 13 runs radially through the die 15, but can of course also be guided through another wall boundary of the pressing space.
  • the signal of the pressure sensor 14 is fed to an amplifier element 18, which in the case of the pressure sensor 14 being designed as a piezo probe as an integrating amplifier element and, for example, in the case of a strain gauge probe can be designed as a simple voltage amplifier, in each case a signal curve is achieved which is strictly proportional to the pressure curve in the molding compound.
  • the output of the amplifier element 18 is connected both to the input of a first threshold value stage 19 and to the input of a differentiating element 20, the output of which is connected to the input of a second threshold value stage 21.
  • a non-inverting output of the first threshold value stage 19 and an inverting output of the second threshold value stage 21 are linked to one another via an AND gate 22, the output of which is connected to a timing element 23.
  • the AND gate 22 generates a 1 signal at its output when a threshold S 1 of the first threshold level 19 is exceeded and a second threshold S 2 of the second threshold level 21 is undershot.
  • the AND gate 22, depending on the inversion or non-inversion of the outputs of the two threshold stages 19, 21 and the required trigger signal for the timing element 23, can also be replaced by another logic gate which, depending on the required input and output signals, has the same logic Linking causes.
  • the hydraulic circuit of the mass pump is controlled via an amplifier 24, that is, the filling pressure is controlled by a valve or the like after this time. switched off. This could also be done, for example, by the mass check valve 12.
  • the pressed part can now be removed, or there is an additional compression by means of the lower punch 16, as described in more detail in the prior art specified at the beginning.
  • the mass pump is switched on at a time T0 according to FIG. 2 or the mass check valve 12 is opened.
  • the mass begins to flow into the baling chamber via the mass filling channel 13.
  • There is first an increase in pressure until a steady flow is reached at a flow pressure P 1.
  • a corresponding voltage U 1 is generated at the output of the amplifier element 18. The flow takes place during the time t f and is complete when the baling chamber is completely filled with the mass to be filled.
  • the lower diagram of FIG. 2 shows the time differential quotient of the voltage corresponding to the pressure according to the upper diagram of FIG. 2.
  • the two pressure increase phases at the beginning of the flow time and at the end of the flow time thus generate high peaks in the lower diagram.
  • the differential quotient becomes very small and falls below the threshold S2. If one therefore logically linked the exceeding of the first threshold value S1 lying between the voltage levels U1 and U2 by the upper voltage curve and the falling below the threshold value S2 by the differential quotient logically by means of an AND operation by means of the AND gate 22, a trigger signal is obtained for that Timing element 23 at time T 1, which coincides exactly with the reaching of the filling pressure P 2.
  • the timer 23 has a holding time t h , that of the optimized filling pressure holding time corresponds and can be up to 1 sec. During this time, the required compaction of the mass takes place in the pressing tool 11. After this holding time has elapsed, either the product produced, for example an oxide magnet, is removed from the pressing tool or previously additionally compressed again by means of the lower punch 16.
  • the mass filling channel 13 can lead to several pressing tools that are filled together in one work cycle.
  • Schmitt triggers or comparators can be used as threshold values, from which an input is supplied with the respective threshold value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Power Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Presses (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Powder Metallurgy (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Hard Magnetic Materials (AREA)
  • Basic Packing Technique (AREA)
  • Press Drives And Press Lines (AREA)

Claims (8)

  1. Dispositif de commande pour la commande dans le temps de la pression de remplissage d'un outil de moulage par compression avec une masse pâteuse ou du type barbotine, en particulier pour la fabrication d'aimants en oxydes avec un capteur de mesure de la pression détectant la pression dans l'outil de moulage par compression en amenant un signal de pression correspondant à un étage à valeur de seuil ainsi qu'à un organe de différenciation, l'étage à valeur de seuil agissant sur un relais de temporisation maintenant la pression de remplissage pendant un temps d'arrêt pouvant être fixé à une valeur prévue, dispositif de commande caractérisé en ce que le signal de pression peut être amené au moyen de l'organe de différenciation (20) à un deuxième étage à valeur de seuil (21) et en ce que les sorties des deux étages à valeur de seuil (19, 21) sont reliées à une porte logique (22) lors du dépassement d'une première valeur de seuil (S₁) du premier étage à valeur de seuil (19) et du dépassement inférieur simultané d'une deuxième valeur de seuil (S₂) du deuxième étage à valeur de seuil (21).
  2. Dispositif de commande selon la revendication 1, caractérisé en ce qu'un organe d'amplification (18) est monté en aval du détecteur de mesure de pression (14).
  3. Dispositif de commande selon la revendication 2, caractérisé en ce que le détecteur de pression (14) est constitué comme une piézo sonde ou une jauge de contrainte.
  4. Dispositif de commande selon la revendication 3, caractérisé en ce que l'organe d'amplification (18) relié au détecteur de mesure de pression (14) constitué comme une piézo sonde est un organe d'amplification intégrateur.
  5. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que la première valeur de seuil (S₁) se trouve entre la pression d'écoulement (P₁) et la pression de remplissage (P₂).
  6. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que la deuxième valeur de seuil (S₂) est plus petite que le quotient instantané différentiel de la montée de la pression entre la pression d'écoulement (P₁) et la pression de remplissage (P₂).
  7. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que le relais de temporisation (23) agit par l'intermédiaire d'un organe d'amplification (24) sur le circuit hydraulique d'une pompe et ou sur la pompe elle-même de la masse.
  8. Dispositif de commande selon la revendication 7, caractérisé en ce que le relais de temporisation agit sur une vanne (12) dans une canalisation de remplissage (10) allant à l'outil de moulage par compression (11).
EP90900757A 1988-12-30 1989-12-14 Dispositif de commande dans le temps de la pression de remplissage d'outils de moulage par compression Expired - Lifetime EP0451172B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3844334 1988-12-30
DE3844334A DE3844334C1 (fr) 1988-12-30 1988-12-30

Publications (2)

Publication Number Publication Date
EP0451172A1 EP0451172A1 (fr) 1991-10-16
EP0451172B1 true EP0451172B1 (fr) 1992-11-11

Family

ID=6370535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900757A Expired - Lifetime EP0451172B1 (fr) 1988-12-30 1989-12-14 Dispositif de commande dans le temps de la pression de remplissage d'outils de moulage par compression

Country Status (7)

Country Link
US (1) US5164202A (fr)
EP (1) EP0451172B1 (fr)
JP (1) JPH04502428A (fr)
KR (1) KR910700130A (fr)
DE (2) DE3844334C1 (fr)
ES (1) ES2020059A6 (fr)
WO (1) WO1990007406A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103408A1 (de) * 1991-02-05 1992-08-06 Bosch Gmbh Robert Vorrichtung und verfahren zur herstellung von masshaltigen formkoerpern aus pastoesen massen
DE4328312A1 (de) * 1993-08-23 1995-03-02 Draegerwerk Ag Füllfederhalter mit variablem Füllreservoir zum Druckausgleich zwischen Reservoir und Umgebung
US5766526B1 (en) * 1994-04-20 1999-08-24 Fuji Photo Film Co Ltd Method and apparatus for injection molding
DE4428691A1 (de) * 1994-08-12 1996-02-15 Rexroth Mannesmann Gmbh Regelanordnung für hydraulische Antriebe
DE19536566C1 (de) * 1995-10-02 1997-02-06 Arburg Gmbh & Co Verfahren zur Regelung des Werkzeuginnendrucks an einer zyklisch arbeitenden Maschine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1584543C3 (de) * 1964-11-28 1979-04-05 Laeis-Werke Ag, 5500 Trier Regeleinrichtung an Pressen zum Herstellen von Formungen gleicher Dichte und gleicher Abmessungen
US3642404A (en) * 1968-11-21 1972-02-15 Meiki Seisakusho Kk Injection-molding machine
US3767339A (en) * 1971-11-01 1973-10-23 Hunkar Instr Dev Labor Inc Injection molding control
US3859400A (en) * 1974-01-11 1975-01-07 Cincinnati Milacron Inc Method for injection molding machine automatic control
DE2514009C3 (de) * 1975-03-29 1981-03-12 Robert Bosch Gmbh, 7000 Stuttgart Kunststoff-Spritzgießmaschine mit einer Regelvorrichtung zum Regeln des auf eine Plastifizier- und Einspritzschnecke einwirkenden Hydraulikdruckes
US4060362A (en) * 1975-05-12 1977-11-29 International Business Machines Corporation Injection molding same cycle control
DE2725804C2 (de) * 1977-06-08 1986-07-31 Werner & Pfleiderer, 7000 Stuttgart Verfahren zum Druckaufbau in einer Presse für eine explosive Masse und Schaltanordnung zum Ausüben des Verfahrens
JPS5532006A (en) * 1978-08-25 1980-03-06 Ricoh Co Ltd Hologram information reproducing head
JPS56146741A (en) * 1980-04-18 1981-11-14 Hitachi Ltd Setting of holding time and system therefor
US4376950A (en) * 1980-09-29 1983-03-15 Ampex Corporation Three-dimensional television system using holographic techniques
DE3143550A1 (de) * 1981-11-03 1983-05-11 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Presswerkzeug zum herstellen keramischer formlinge aus pulverfoermiger masse
DE3144678A1 (de) * 1981-11-10 1983-05-19 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren und einrichtung zur herstellung von formlingen aus einer rieselfaehigen masse
DE3347035A1 (de) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur steuerung des fuelldrucks bei der herstellung von oxidmagneten
JPH06100692B2 (ja) * 1985-10-04 1994-12-12 株式会社フジクラ 光フアイバ画像伝送装置

Also Published As

Publication number Publication date
DE58902725D1 (de) 1992-12-17
EP0451172A1 (fr) 1991-10-16
WO1990007406A1 (fr) 1990-07-12
KR910700130A (ko) 1991-03-14
JPH04502428A (ja) 1992-05-07
ES2020059A6 (es) 1991-07-16
DE3844334C1 (fr) 1990-06-28
US5164202A (en) 1992-11-17

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