EP0441289A1 - Vakuumdruckgiessverfahren - Google Patents

Vakuumdruckgiessverfahren Download PDF

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Publication number
EP0441289A1
EP0441289A1 EP91101449A EP91101449A EP0441289A1 EP 0441289 A1 EP0441289 A1 EP 0441289A1 EP 91101449 A EP91101449 A EP 91101449A EP 91101449 A EP91101449 A EP 91101449A EP 0441289 A1 EP0441289 A1 EP 0441289A1
Authority
EP
European Patent Office
Prior art keywords
die casting
sprue runner
casting process
boiling
molten metal
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.)
Withdrawn
Application number
EP91101449A
Other languages
English (en)
French (fr)
Inventor
Kojiro C/O Yamasaki Engineering Co. Ltd Yamasaki
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.)
YAMASAKI ENGINEERING Co Ltd
Original Assignee
YAMASAKI ENGINEERING Co Ltd
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 YAMASAKI ENGINEERING Co Ltd filed Critical YAMASAKI ENGINEERING Co Ltd
Publication of EP0441289A1 publication Critical patent/EP0441289A1/de
Withdrawn legal-status Critical Current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
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor

Definitions

  • the present invention relates to a vacuum die casting process.
  • conventional techniques of die casting in which amount of gas included in the die cast product is to be reduced, may be generally classified into two methods, i.e., massive-vent method in which resistance of degassing groove is increased so as to prevent blowout of molten metal, and quick-shaft method in which die is equipped with a vacuum valve and the valve is closed by inetia of molten metal injected at high speed.
  • the hydrogen brings about undesirable micro-porosity, shrinkage cavity, wrinkle, cold-shut, expansion, blistering, etc., while cthe carbon makes the cast product blackened, i.e., dirty-looking.
  • the lubricating oil in the piston sleeve being in contact with the molten metal of high temperature comes to be vaporized (or gasified).
  • the gas produced by the vaporization condenses itself when passing through the sprue runner and cavity. And with such condensed portion, the molten metal of high temperature reaching afterward comes in contact and is decomposed thereby producing a large mount of hydrogen, eventually resulting in the problem of micro-porosity.
  • the present invention was made to solve the above-discussed problems and has an object o f providing a die casting process in which generation of hydrogen, carbon, etc. in the piston sleeve, the cavity and sprue runner is restrained so as not to affect negatively the quality of cast product and to achieve a product completely free from micro-porosity.
  • the die casting process in accordance with the present invention comprises the steps of disposing a boiling shutoff device on a sprue runner from a sleeve to a cavity and branching a degassing groove from the sprue runner.
  • a pin is employed as the mentioned boiling shutoff device, and that a gap for moderating differential pressure is provided in the degassing groove branched from the sprue runner.
  • the mentioned boiling shutoff device is a sprue runner which is meanderingly formed to serve as a resistance sprue runner. It is preferable that a basin is provided in place of the mentioned degassing groove branched from the sprue runner.
  • the sprue runner is filled with only the molten metal completely pure and clean which comes afterward, and pressure generated thereby pushes up the boiling shutoff pin against a spring, finally actuating the limit switch for high speed injection through an inclined surface and sliding plates.
  • vacuum suction may be carried out to the extent of not causing bumping in the vaccum system of low degree on the molten metal introducing side of the resistance sprue runner until the molten metal reaches the middle part on the resistance sprue runner.
  • the injection piston moving forward at low speed is stopped upon reaching the molten metal as mentioned, and at the same time the vacuum system of high vacuum degree on the cavity side and a timer for controlling vacuum time are put into operation. High injection is carried out after accomplishing complete vacuum state in the sprue runner and cavity.
  • lubricating oil in the sleeve may be prevented from bumping due to sharp pressure drop by sudden occurrence of high vacuum.
  • the gas generated by vaporization of lubricating oil due to contact with molten metal of high temperature in the sleeve and the air existing before supplying the molten metal in the sleeve can be exactly discharged out of the die through the degassing groove of low speed without passing through the cavity.
  • the inner part of the cavity is kept clean and this clean cavity is filled with pure molten metal without containing impurity gas, thus a perfect product without micro-porosity being obtained.
  • the invention is applicable not only to die casting but also to other casting to xhibit the foregoing advantages.
  • the boiling shutoff pin 1 is provided between the cavity 3 and the sleeve 4 of the sprue runner 2.
  • This boiling shutoff pin 1 is inserted in such a manner as to be freely slidable perpendicularly to the mating surface 8.
  • the degassing groove 6 is provided to normally close the sprue runner with an impetus given by the spring 5.
  • almost half of a circular end face 7 of the mentioned boiling shutoff pin 1 may come in contact with the mating face 8 for closing, and through such a half closing position, the degassing groove 6 communicates with the sprue runner 2, then is turned to advance laterally.
  • the degassing groove 9 for concavely providing the degassing groove 9 for high vacuum suction, one end is guided out of the die while the other end communicating with the cavity 3.
  • the gap 10 for moderating differential pressure is formed in such a manner that a part of the degassing groove 6 branched from the sprue runner 2, that is, the bottom side may be higher.
  • the resistance sprue runner 16 is provided to the mating surface in such a maner as to be meander between the sleeve 4 and the cavity 3. More specifically, the degassing groove 6 is provided laterally from the end of the sleeve of the resistance sprue runner 16, and it is preferable that a switch (not illustrated) also serving as changeover from low speed to high speed is provided so that movement of the molten metal may be temporarily stopped in the resistance sprue runner 6 without fail.
  • the molten metal basin 17 is concavely provided laterally from the position of the mating face with which the end of the boiling shutoff pin 1 comes in contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP91101449A 1990-02-05 1991-02-04 Vakuumdruckgiessverfahren Withdrawn EP0441289A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2654790A JPH03230855A (ja) 1990-02-05 1990-02-05 ダイカストの真空鋳造法

Publications (1)

Publication Number Publication Date
EP0441289A1 true EP0441289A1 (de) 1991-08-14

Family

ID=12196538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91101449A Withdrawn EP0441289A1 (de) 1990-02-05 1991-02-04 Vakuumdruckgiessverfahren

Country Status (2)

Country Link
EP (1) EP0441289A1 (de)
JP (1) JPH03230855A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0515038A2 (de) * 1991-05-24 1992-11-25 YAMASAKI KOSAKUSHO Co. Ltd. Spritzgussvorrichtung
DE19914830A1 (de) * 1999-04-01 2000-10-05 Buehler Druckguss Ag Uzwil Verfahren zum Vakuum-Druckgiessen und Druckgiessform
EP1970145A2 (de) 2007-03-13 2008-09-17 Bühler Druckguss AG Verfahren zur Entlüftung von Formen
WO2017066951A1 (en) * 2015-10-22 2017-04-27 GM Global Technology Operations LLC Ultra-vacuum high pressure die casting process, and system therefore
CN112872314A (zh) * 2019-11-29 2021-06-01 贺利氏阿姆洛伊技术有限公司 用于对无定形金属进行注射成型的注射成型系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1001767A (fr) * 1949-12-02 1952-02-27 Perfectionnement apporté au procédé de moulage sous pression et appareillage en permettant la mise en oeuvre
FR1133548A (fr) * 1954-06-29 1957-03-28 Procédé de fonte sous pression et machine permettant la mise en oeuvre dudit procédé
US3121926A (en) * 1957-11-04 1964-02-25 Glen R Morton Vacuum system for die casting
FR1416039A (fr) * 1963-11-14 1965-10-29 Procédé et machine de moulage sous pression
CH454369A (de) * 1966-03-18 1968-04-15 Buehler Ag Geb Absaugvorrichtung zum Entlüften der Formen von Druckgiessmaschinen
EP0241426A1 (de) * 1986-04-11 1987-10-14 Schweizerische Aluminium Ag Verfahren und Anlage zum Druckgiessen
EP0275426A2 (de) * 1987-01-17 1988-07-27 Vereinigte Aluminium-Werke Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung von faserverstärkten Metallteilen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1001767A (fr) * 1949-12-02 1952-02-27 Perfectionnement apporté au procédé de moulage sous pression et appareillage en permettant la mise en oeuvre
FR1133548A (fr) * 1954-06-29 1957-03-28 Procédé de fonte sous pression et machine permettant la mise en oeuvre dudit procédé
US3121926A (en) * 1957-11-04 1964-02-25 Glen R Morton Vacuum system for die casting
FR1416039A (fr) * 1963-11-14 1965-10-29 Procédé et machine de moulage sous pression
CH454369A (de) * 1966-03-18 1968-04-15 Buehler Ag Geb Absaugvorrichtung zum Entlüften der Formen von Druckgiessmaschinen
EP0241426A1 (de) * 1986-04-11 1987-10-14 Schweizerische Aluminium Ag Verfahren und Anlage zum Druckgiessen
EP0275426A2 (de) * 1987-01-17 1988-07-27 Vereinigte Aluminium-Werke Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung von faserverstärkten Metallteilen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0515038A2 (de) * 1991-05-24 1992-11-25 YAMASAKI KOSAKUSHO Co. Ltd. Spritzgussvorrichtung
EP0515038A3 (en) * 1991-05-24 1993-02-17 Yamasaki Kosakusho Co. Ltd. Molding apparatus
US5275549A (en) * 1991-05-24 1994-01-04 Yamasaki Kosakusho Co., Ltd. Molding apparatus with degassing mechanism
DE19914830A1 (de) * 1999-04-01 2000-10-05 Buehler Druckguss Ag Uzwil Verfahren zum Vakuum-Druckgiessen und Druckgiessform
WO2000059658A1 (de) * 1999-04-01 2000-10-12 Bühler Druckguss AG Verfahren zum vakuum-druckgiessen und druckgiessform
EP1970145A2 (de) 2007-03-13 2008-09-17 Bühler Druckguss AG Verfahren zur Entlüftung von Formen
DE102007012577A1 (de) 2007-03-13 2008-09-18 Bühler Druckguss AG Verfahren zur Entlüftung von Formen
WO2017066951A1 (en) * 2015-10-22 2017-04-27 GM Global Technology Operations LLC Ultra-vacuum high pressure die casting process, and system therefore
CN112872314A (zh) * 2019-11-29 2021-06-01 贺利氏阿姆洛伊技术有限公司 用于对无定形金属进行注射成型的注射成型系统
EP3827913A1 (de) * 2019-11-29 2021-06-02 Heraeus Deutschland GmbH & Co KG Spritzgusssystem für den spritzguss von amorphen metallen
US11318649B2 (en) 2019-11-29 2022-05-03 Heraeus Amloy Technologies Gmbh Injection molding system for the injection molding of amorphous metals

Also Published As

Publication number Publication date
JPH03230855A (ja) 1991-10-14

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