EP0068147A1 - Dispositif pour l'admission de pression au cylindre à presser dans une machine à coulée sous pression - Google Patents

Dispositif pour l'admission de pression au cylindre à presser dans une machine à coulée sous pression Download PDF

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Publication number
EP0068147A1
EP0068147A1 EP82104584A EP82104584A EP0068147A1 EP 0068147 A1 EP0068147 A1 EP 0068147A1 EP 82104584 A EP82104584 A EP 82104584A EP 82104584 A EP82104584 A EP 82104584A EP 0068147 A1 EP0068147 A1 EP 0068147A1
Authority
EP
European Patent Office
Prior art keywords
pressure
cylinder
compensating
gas
press
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
EP82104584A
Other languages
German (de)
English (en)
Other versions
EP0068147B1 (fr
Inventor
Friedrich Dipl.Ing. Stummer
Rolf Frey
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.)
Mahle GmbH
Original Assignee
Mahle 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 Mahle GmbH filed Critical Mahle GmbH
Publication of EP0068147A1 publication Critical patent/EP0068147A1/fr
Application granted granted Critical
Publication of EP0068147B1 publication Critical patent/EP0068147B1/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 device for pressurizing the press cylinder of a die casting machine according to the preamble of claim 1.
  • phase 1 In the initial phase of the casting process (phase 1), only a low speed of the plunger is provided in order to avoid splashing of the melt. In the actual filling phase (phase 2), high velocities of the plunger are selected in order to carry out the filling process quickly, while in the final and holding pressure phase (phase 3) considerably higher baling pressures are required and therefore the plunger is subjected to high pressure.
  • the invention has for its object to provide a pressurizing device working in all working phases with hydraulic fluid with a similar device simple structure, as described in such devices in DE-OS 23 56 711, in which a safe Damping the pressure surge at the end of the 2nd and 3rd Working phase can be achieved while maintaining the highest possible pressure difference between the pressure accumulator and the plunger in the actual filling phase.
  • the drawing shows a flow diagram of an embodiment of the invention.
  • Press cylinder and plunger of the casting machine are designated 1 and 4.
  • the valves 2, 3, 5 and 6 and the lines leading to the press cylinder 1 are used essentially only for carrying out the first working phase and for the return of the plunger 4 and the emptying of the compensating cylinder 8b).
  • Only the valve 5 also performs a function in the 2nd and 3rd working phases in such a way that it ensures a rapid drainage of the hydraulic fluid from the press cylinder.
  • the valve 3, on the other hand, only ensures at the end of the 2nd and 3rd working phases that the line which opens from the pressure side of the plunger 4 is closed.
  • the high-pressure accumulator 7a, 7b and the compensation accumulator 8b, 8b are essential elements for realizing the invention.
  • the high-pressure accumulator 7a, 7b and the compensating accumulator 8a, 8b each consist of a cylinder (high-pressure cylinder 7b or compensating cylinder 8b), each with a piston 10 or 11 displaceable therein and downstream pressure vessels (high-pressure container 7a or compensating container 8a).
  • a cylinder high-pressure cylinder 7b or compensating cylinder 8b
  • piston 10 or 11 displaceable therein and downstream pressure vessels
  • downstream pressure vessels high-pressure container 7a or compensating container 8a
  • other separating elements such as storage bladders can be used.
  • the volume of the pressure containers 7a, 8a is designed such that the pressure level of the stored gas remains approximately constant over the entire displacement paths of the pistons 10 and 11, or changes slightly progressively in the compensating cylinder 8b.
  • the final pressure in the high-pressure accumulator 7a, 7b is built up by pushing back the piston 10 under the pressure of hydraulic fluid introduced into the high-pressure cylinder 7b.
  • the pressure in the compensating accumulator 8a, 8b is predetermined as a function of the desired holding pressure in the 3rd phase and is below the final pressure in the high-pressure accumulator 7a, 7b.
  • the pressure setting in the expansion tank 8a is carried out by the amount of hydraulic fluid that is introduced via the pressure setting valve 12.
  • the operation of the pressurizing device is as follows.
  • the first working phase takes place with the valve 9 closed and the valves 2 and 3 actuated in a manner known per se.
  • the transition to the second work phase is initiated by opening the valve 9 provided with an adjustable throttle.
  • the piston 11 of the compensating cylinder 8b is in the position shown in the drawing.
  • the piston 10 of the high-pressure cylinder 7b now presses the hydraulic fluid under the full pressure of the high-pressure container 7a into the press cylinder 1 on the press piston 4 at the beginning of the second work phase.
  • the line between the press cylinder 1 prevails and high-pressure accumulators 7a, 7b a lower pressure than that set in the expansion tank 8a.
  • the piston 11 does not change its position during the second working phase.
  • a prerequisite for the functionality of the device is that the displacement paths of the pistons 10 and 11 are designed such that when the piston 10 is fully extended, the piston 11 is still freely movable at the end of the 3rd working phase, ie it is not yet in the direction of has reached the downstream expansion tank 8a.
  • the pressure in the high Pressure vessel 7a can be set to 300 bar, for example. In this case, the pressure to be selected for the expansion tank 8a is approximately in a range between 80 and 270 bar. The pressure level actually set depends on the level of the desired reprint at the end of the 3rd work phase.
  • the compensating cylinder 8b is connected in the narrowest cross section of a Venturi tube 13 arranged in the connecting line between the press cylinder 1 and valve 9. This ensures that the hydraulic fluid always flows in the direction of the press cylinder 1 at the high flow velocities in the venturi tube, since the static pressure on the piston 11 is lower than that which acts on the press piston 4.
  • the compensating cylinder 8b is emptied by switching the valves 6, 2 and 3 until the piston 11 is in the starting position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
EP82104584A 1981-06-30 1982-05-26 Dispositif pour l'admission de pression au cylindre à presser dans une machine à coulée sous pression Expired EP0068147B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3125598 1981-06-30
DE19813125598 DE3125598A1 (de) 1981-06-30 1981-06-30 Einrichtung zur druckbeaufschlagung des presszylinders einer druckgiessmaschine

Publications (2)

Publication Number Publication Date
EP0068147A1 true EP0068147A1 (fr) 1983-01-05
EP0068147B1 EP0068147B1 (fr) 1984-07-25

Family

ID=6135670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104584A Expired EP0068147B1 (fr) 1981-06-30 1982-05-26 Dispositif pour l'admission de pression au cylindre à presser dans une machine à coulée sous pression

Country Status (3)

Country Link
EP (1) EP0068147B1 (fr)
JP (1) JPS586766A (fr)
DE (2) DE3125598A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186002A1 (fr) * 1984-12-21 1986-07-02 Mahle Gmbh Dispositif pour empêcher des pointes de pression dans un appareil de pression d'une machine à couler sous pression

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2231037B1 (es) * 2003-10-31 2005-12-16 Archivel Technologies, Sl Agente inmunoterapico util para el tratamiento combinado de la tuberculosis en asociacion con otros farmacos.
CN102379748A (zh) * 2011-11-16 2012-03-21 中钢集团洛阳耐火材料研究院有限公司 一种齿科用差压式纯钛铸钛机的气路***

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2356711A1 (de) * 1972-11-14 1974-05-16 Toshiba Machine Co Ltd Injektionszylinderanordnung fuer eine druckgussmaschine
DE2355594A1 (de) * 1973-11-07 1975-05-15 Valentin Emmerich Vorrichtung zum einstellen der beim druckgiessen erforderlichen presskolbengeschwindigkeiten, -druecke und druckaufbauzeiten
DE2406528A1 (de) * 1974-02-12 1975-08-21 Idra Pressen Gmbh Nach dem mehrphasenprinzip arbeitende druckgiessmaschine
DE2922914A1 (de) * 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165929C3 (de) * 1971-12-31 1982-04-29 Maschinenfabrik Weingarten Ag, 7987 Weingarten Einrichtung zum beschleunigten Aufbau und zur Regulierung des Nachdruckes an Druckgießmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2356711A1 (de) * 1972-11-14 1974-05-16 Toshiba Machine Co Ltd Injektionszylinderanordnung fuer eine druckgussmaschine
DE2355594A1 (de) * 1973-11-07 1975-05-15 Valentin Emmerich Vorrichtung zum einstellen der beim druckgiessen erforderlichen presskolbengeschwindigkeiten, -druecke und druckaufbauzeiten
DE2406528A1 (de) * 1974-02-12 1975-08-21 Idra Pressen Gmbh Nach dem mehrphasenprinzip arbeitende druckgiessmaschine
DE2922914A1 (de) * 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186002A1 (fr) * 1984-12-21 1986-07-02 Mahle Gmbh Dispositif pour empêcher des pointes de pression dans un appareil de pression d'une machine à couler sous pression
DE3446836A1 (de) * 1984-12-21 1986-07-03 Mahle Gmbh, 7000 Stuttgart Einrichtung zur druckspitzenverhinderung in dem pressaggregat einer druckgiessmaschine

Also Published As

Publication number Publication date
EP0068147B1 (fr) 1984-07-25
JPS586766A (ja) 1983-01-14
DE3125598A1 (de) 1983-01-13
DE3260458D1 (en) 1984-08-30

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