EP0160921A2 - Machine à couler sous pression ou par injection - Google Patents

Machine à couler sous pression ou par injection Download PDF

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Publication number
EP0160921A2
EP0160921A2 EP85105266A EP85105266A EP0160921A2 EP 0160921 A2 EP0160921 A2 EP 0160921A2 EP 85105266 A EP85105266 A EP 85105266A EP 85105266 A EP85105266 A EP 85105266A EP 0160921 A2 EP0160921 A2 EP 0160921A2
Authority
EP
European Patent Office
Prior art keywords
casting
stage
machine according
pressure
piston
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.)
Granted
Application number
EP85105266A
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German (de)
English (en)
Other versions
EP0160921A3 (en
EP0160921B1 (fr
Inventor
Werner Brugger
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.)
Buehler AG
Original Assignee
Buehler AG
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 Buehler AG filed Critical Buehler AG
Publication of EP0160921A2 publication Critical patent/EP0160921A2/fr
Publication of EP0160921A3 publication Critical patent/EP0160921A3/de
Application granted granted Critical
Publication of EP0160921B1 publication Critical patent/EP0160921B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a pressure or injection molding machine with a drive device determining the injection pressure when filling the cavity of a mold for the movement of a piston device in a housing of a predetermined volume, the amount of molding material pressed into the mold cavity per unit of time depending on the speed of the movement of the piston device within the housing is dependent, with a pressure sensor for the injection pressure and a travel sensor for the travel of the piston device and with a timer.
  • a piston device for pressing in the molding material, which is formed in one case by the casting piston and in the other case by a piston-like extruder screw.
  • a drive device is provided, which is generally formed by a casting drive, optionally with a multiplier piston.
  • the housing mentioned is the casting chamber which receives the plunger in the case of die casting machines and the injection cylinder in the case of injection molding machines.
  • Such machines often have at least one pressure transmitter for control and / or display purposes, which often comprises two pressure sensors arranged on the drive cylinder to determine a differential pressure. Furthermore, a displacement sensor and a timer are provided, as described for example in DE-OS 3 142 811.
  • the invention has for its object to increase the productivity and quality of the products by a constant control of the performance data. According to the invention, this is done in that the outputs of the sensors are connected to a computing stage for calculating the actual casting power, and that the output of the computing stage is connected to an evaluation device.
  • the evaluation device can optionally also be formed by a control device, but in practice the actual casting performance depends to a large extent on the shape of the shape, for example on the geometry of the gate, so that it is preferred if the evaluation device is a display device having.
  • the evaluation device can have, for example, an interrupter switch for operating the machine or only a part thereof (for example for driving the piston device).
  • falling below a predetermined lower threshold value can also be of interest in order to give the operating personnel the opportunity to improve productivity.
  • the alarm device can be both a visual and an acoustic one.
  • a die casting machine 1 has in the usual way a casting chamber 2, in which a casting piston 3 is displaceable. To control the movement of the casting piston 3, a casting drive cylinder 4 is provided, in which a casting drive piston 5 can be displaced in a manner known per se by supplying hydraulic fluid. The drive piston 5 is connected to the casting piston 3 via a relatively long piston rod 6. Metal melt filled in via an opening 35 can be injected into the cavity 37 between the fixed and movable mold 38 or 39 via a gate 36.
  • a pressure sensor 7, 8 is arranged in front of and behind the drive piston 5 as a pressure transmitter for the differential pressure between the two piston sides in the drive cylinder 4. It goes without saying that the injection pressure of the liquid casting material in front of the casting piston 3 can thus be determined, and that other arrangements of individual or more pressure sensors are also possible for determining this injection pressure. Thus, it is conceivable to use a single sensor, e.g. by means of strain gauges.
  • an arm 9 projecting approximately perpendicular to its longitudinal axis is provided on the piston rod 6, one arm parallel to the piston rod 6 displaceable part 10 of a, for example capacitive sensor 11 for measuring the path of the piston rod 6 carries.
  • the displaceable part 10 can have a relatively fine scale division, which is opposed by an optical reading device as an incremental encoder.
  • the displaceable part 10 could be made of metal and provided with teeth, the movement of which is used inductively for path measurement.
  • the piston rod 6 itself could also be provided with markings or bear such on a rod protruding from the cylinder 4 on the right-hand side of FIG. 1.
  • the computing stage X is merely a multiplication stage.
  • the output signal of this computing stage X can now preferably be fed to a comparator stage 13, which compares the ACTUAL power with a TARGET value.
  • This TARGET value corresponds to the maximum casting power, as will be explained later with reference to FIG. 2, and is determined with the aid of the values from a TARGET value transmitter S.
  • the comparator stage 13 calculates what percentage of the maximum power is the actual power. In stage 13, therefore, essentially only a multiplication is carried out by a factor dependent on the machine and the diameter of the casting piston 3 used.
  • the output signal corresponding to this multiplication corresponds to the percentage of the actual casting power compared to the maximum casting power.
  • the die casting machine 1 can now be assigned a display device 14 in the form of a device cabinet and the output signal of the comparator stage 13 can be fed to a simple pointer device 15, for example a galvanometer device.
  • the circuit is expediently such that the output signal of the comparator stage 13 is retained for a predetermined time at the output of this stage 13, so that the pointer position of the pointer device 15 is stable during this predetermined time.
  • a memory 16 can be connected to the output of the comparator stage 13.
  • the output signal coming from the computing stage X is fed to a coordinate converter 17, which forms the coordinates for the horizontal or vertical deflection of a display device 18 based on the size of the output signal of the computing stage X.
  • the signal from the coordinate converter 17 can, for example, simply be supplied to the deflection system 19 of the screen device 18 in order to place a light spot Peff on the screen 18 in a position corresponding to the output signal of the computing stage X.
  • the screen 18 can carry a glued-on diagram D, so that its position relative to this diagram D can be seen from the position of the point Peff .
  • This diagram D is shown in FIG. 2 on an enlarged scale and with addition to the explanation.
  • a memory module M e.g. a ROM or a Ram
  • the angle and the course of the line that limits the maximum casting performance can be set with the aid of two setting buttons 20 (if necessary also with the aid of number keys) L can be changed.
  • a converter or memory stage 21 can be connected to the output of the coordinate converter 17 in order to be able to record the point Peff in the correct ratio to the diagram D supplied by the module M or for a longer period.
  • the output of this stage 21 does not like it only with the deflection system 19, but with the picture tube 22 itself, for. B. be connected via the module M, the tube 22 being operated in the manner of a television tube.
  • the position of the point P Ieff relative to the diagram D can already be used to read or estimate the ratio of the actual casting power to the maximum target casting power, but it may be desirable to be able to read the exact percentage value on the screen 18.
  • the signal from the K is 13 omparatorcut necessary, for example, a character generator C of known construction is be fed, whose output is connected to the image tube 22, directly or through either the module M.
  • the character generator C the percentages corresponding to the output signal of the comparator stage 13 are displayed at a predetermined location on the screen 18, in particular in the upper right corner thereof, as is illustrated by the numerical field 23.
  • a s information about the IS-Giessleistun g especially for the beginning of a Giessteil pour is important, and later possibly other graphical representations of interest, but on the other hand, may be a separate display device and in particular a separate screen for each graph too expensive, is preferably a switchover device 24 is provided, by means of which at least the display device 18 (optionally also the pointer device 15) can be connected to at least one second line 25 carrying a signal to be displayed.
  • Line 25 is an output line from the computing stage v and therefore carries the speed signal for the casting piston 3.
  • the speed of the casting piston 3 is an important operating parameter which can be processed in a forming and storage stage 26 in such a way that a diagram of the speed curve is shown on the screen 18 every shot is deliverable.
  • the stage 21 is also expediently designed as a storage stage, so that after each shot, by actuating a switch 27, both the one and the other diagram can be brought to the screen 18.
  • an actuating button 28 is provided, which is expediently lockable in a manner not known, known per se, in the position shown in FIG. 1, which is pressed against the action of a spring (not shown). By releasing the catch, the actuation button 28 returns to its normal position, in which the tube 22 is connected to the line 25.
  • the actuation button 28 may, for example, be connected to an oblique cam surface 29 through which the switch 27 can be actuated.
  • an alarm indicator 30 is provided, which can be designed as an optical and / or acoustic signal transmitter. In the event that the point P leff moves too close to the line L and thereby exceeds a TARGET value (corresponding to a line running parallel to the line L), this may trigger a signal at the output of a threshold value transmitter 31 which switches on the alarm display 30 .
  • the TARGET value transmitter 31 is of course not a mere threshold switch in the manner of a Schmitt trigger.
  • an adjusting device 32 can be provided. With the aid of this setting device 32, the distance of the line L (cf. FIG. 2) which limits the maximum casting power can be adjusted from the line 33 which determines the threshold value of the threshold value transmitter 31.
  • a further threshold value stage can be connected to the output of the comparator stage 13, as a result of which a lower threshold value is established.
  • the further threshold value stage can then be connected to the alarm display 30 or a further alarm display in order to indicate that a predetermined minimum power has been undershot and to make the operating personnel aware that the machine 1 is not being optimally used.
  • a single threshold transmitter 32 can define the upper threshold line 33 and also a lower parallel line that is shifted to the line 33 against the zero point of the diagram D.
  • an additional alarm display may therefore be provided for the lower threshold value line, but individual display devices 15, 18 or 30 can also be omitted if desired.
  • the diagram D can simply be shown on the screen 18 together with the point PIeff, as can be seen from FIG. 1. However, additional lines that facilitate understanding can also be represented, as will now be described with reference to FIG. 2.
  • a line W the so-called form resistance line, drawn from the zero point to the operating point P leff and also extended to the line L, gives the maximum Operating point P Imax , which corresponds to 100 percent performance. More precisely, it is a rectangle R drawn to the axes of the diagram from the point P Imax found by the shape resistance line W, the area of which corresponds to the maximum casting power. In contrast, the ACTUAL casting power corresponds to a rectangle r that is drawn from the operating point PIeff to the axes of the diagram. Therefore, the display visible on the pointing device 15 or in the display field 23 of FIG.
  • the shape resistance line W possibly also the rectangle r and / or the rectangle R or the effective operating pressure p CMeff or the effective volume flow Q Meff can also be displayed on the screen 18 in FIG. 1.
  • the circuit shown in FIG. 1 can also be used for control purposes, for example by connecting an interrupter switch for switching off the die casting machine 1 to the output of the threshold value stage 31. In this way, poor quality can certainly be prevented without being dependent on the attention of the operating personnel. It would also be conceivable to merely interrupt the drive for the casting piston 3.
  • Another evaluation option is to compare the output signal of the computing stage X with a signal corresponding to the closing force of the machine 1, in order to recognize a so-called format menu in good time.
  • a circuit corresponding to the alarm display 30 with a threshold value transmitter and / or a switch-off device for the machine 1 can be connected to such a comparison stage in the event that the danger of a format frame, i.e. there is a slight gaping of the mold halves 38, 39.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP85105266A 1984-05-10 1985-04-30 Machine à couler sous pression ou par injection Expired EP0160921B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843417293 DE3417293A1 (de) 1984-05-10 1984-05-10 Druck- oder spritzgiessmaschine
DE3417293 1984-05-10

Publications (3)

Publication Number Publication Date
EP0160921A2 true EP0160921A2 (fr) 1985-11-13
EP0160921A3 EP0160921A3 (en) 1986-08-06
EP0160921B1 EP0160921B1 (fr) 1988-03-30

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ID=6235446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105266A Expired EP0160921B1 (fr) 1984-05-10 1985-04-30 Machine à couler sous pression ou par injection

Country Status (3)

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US (2) US4600374A (fr)
EP (1) EP0160921B1 (fr)
DE (2) DE3417293A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939728A1 (de) * 1989-12-01 1991-06-06 Buehler Ag Druck- und spritzgiessmaschine
EP0644030A2 (fr) * 1993-09-08 1995-03-22 Nissei Plastic Industrial Co., Ltd. Dispositif de mesure de pressions pour machines de moulage par injection
FR2720213A1 (fr) * 1994-05-18 1995-11-24 Buehler Ag Geb Procédé et dispositifs pour chauffer des corps métalliques.
GB2357111A (en) * 1999-12-10 2001-06-13 Environmental Seals Ltd Polyurethane twin-walled fireproof structure

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JPH07320B2 (ja) * 1987-02-25 1995-01-11 株式会社日立製作所 半導体封止用トランスファ成形装置
DE3910146C2 (de) * 1988-03-29 1998-01-22 Toshiba Machine Co Ltd Verfahren zum Überwachen des Einspritzdrucks bei einer Spritz- oder Druckgießmaschine
JPH01259922A (ja) * 1988-04-11 1989-10-17 Toshiba Mach Co Ltd ベント式射出成形機
US5611975A (en) * 1989-11-02 1997-03-18 Fanuc, Ltd. Molding condition setting method for an injection molding machine
US5316707A (en) * 1991-09-05 1994-05-31 Tempcraft, Inc. Injection molding apparatus control system and method of injection molding
US6224750B1 (en) * 1998-11-02 2001-05-01 Uop Llc Producing low sulfur hydrocarbons with biologically regenerated caustic
JP6497542B2 (ja) * 2015-01-20 2019-04-10 株式会社ダイレクト２１ ダイカスト装置用のワイヤー速度計
DE102019212631A1 (de) 2019-08-22 2021-02-25 Putzmeister Engineering Gmbh Verfahren zur Zustandsüberwachung einer Vorrichtung und Vorrichtung

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DE3142811A1 (de) * 1981-10-28 1983-05-05 Idra Pressen GmbH, 7000 Stuttgart Verfahren und vorrichtung zur regelung der giesskolbenbewegung waehrend des einpressvorganges an einer druckgiessmaschine
DE3329705A1 (de) * 1983-08-17 1985-03-07 Ortwin Prof.Dr.-Ing. Hahn Druckgiessmaschine mit steuervorrichtung zur druckabhaengigen giessprozesssteuerung

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DE2922914A1 (de) * 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen
DE3142811A1 (de) * 1981-10-28 1983-05-05 Idra Pressen GmbH, 7000 Stuttgart Verfahren und vorrichtung zur regelung der giesskolbenbewegung waehrend des einpressvorganges an einer druckgiessmaschine
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939728A1 (de) * 1989-12-01 1991-06-06 Buehler Ag Druck- und spritzgiessmaschine
EP0644030A2 (fr) * 1993-09-08 1995-03-22 Nissei Plastic Industrial Co., Ltd. Dispositif de mesure de pressions pour machines de moulage par injection
EP0644030A3 (fr) * 1993-09-08 1997-07-09 Nissei Plastics Ind Co Dispositif de mesure de pressions pour machines de moulage par injection.
FR2720213A1 (fr) * 1994-05-18 1995-11-24 Buehler Ag Geb Procédé et dispositifs pour chauffer des corps métalliques.
FR2725391A1 (fr) * 1994-05-18 1996-04-12 Buehler Ag Geb Installation de moulage sous pression avec un transducteur de temps
FR2726495A1 (fr) * 1994-05-18 1996-05-10 Buehler Ag Geb Installation de moulage sous pression avec un capteur de pression
GB2357111A (en) * 1999-12-10 2001-06-13 Environmental Seals Ltd Polyurethane twin-walled fireproof structure
GB2357111B (en) * 1999-12-10 2003-04-23 Environmental Seals Ltd Fire resistant structures

Also Published As

Publication number Publication date
US4708620A (en) 1987-11-24
EP0160921A3 (en) 1986-08-06
US4600374A (en) 1986-07-15
DE3561990D1 (en) 1988-05-05
DE3417293A1 (de) 1985-11-14
EP0160921B1 (fr) 1988-03-30

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