US2867869A - Venting device for die casting machines - Google Patents

Venting device for die casting machines Download PDF

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Publication number
US2867869A
US2867869A US710085A US71008558A US2867869A US 2867869 A US2867869 A US 2867869A US 710085 A US710085 A US 710085A US 71008558 A US71008558 A US 71008558A US 2867869 A US2867869 A US 2867869A
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United States
Prior art keywords
die
valve
piston
conduit
pressure
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Expired - Lifetime
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US710085A
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English (en)
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Hodler Fritz
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Individual
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/09—Piston-vacuum

Definitions

  • the present invention relates generally to .die casting machines and more particularly .to improvements in venting devices for dies in die casting machines of the type in which the die has means for evacuating the air and gases from the die cavity.
  • the evacuating means are characterized by the use of valve means designed to be closed when the die cavity is filled with metal.
  • valves controlling the evacuation of the dies of the machines of the prior art operate satisfactorily, their mounting on one of the die 'halves offers certain difiiculties because of lack of convenient space and because of unfavorable heat conditions which tend to deteriorate the packing used in these valves. Furthermore any repair or maintenance work on the valve necessitates taking the die half from the machines, which especially in the case of large sized diesis a great inconvenience.
  • the object of the present invention isto avoid these inconveniences by the use of' a -valve which is dependent of the die and not connected with the same, this valve being mounted on the frame of the die "casting machine.
  • the valve is provided with means for bringing it into contact with the die prior to the casting operation, and for moving it away from the die When the injection is terminated.
  • the valve is also provided with means for controlling these movements and for allowing the air and gases to be evacuated from the die cavity and has means for insuring the closing of the air channel of the die at the required i time during the injection cycle.
  • valve forms a separate unit attached to the die casting machine Another advantage of my invention is that maintenance and repair 'of thevalve is greatly facilitated since the valve forms a separate unit attached to the die casting machine. -It is also clear that the same valve can be used in connection with a great number of dies. Also the valve can be mounted on the frame of the machine at any place to suit the design and the size of the die.
  • Still another advantage of my invention is that the I ited Patent capacity of the air passage can easily be adapted to the volume of the die and the die cavity in order'to in tion when the die as Well as the venting device are closed.
  • Fig. 2 shows diagrammatically one of the die halves with an air outlet channel.
  • Fig. 3 shows the same arrangement as Fig. l, but in the position when the die is open.
  • Fig. 4 shows diagrammatically a horizontal section of the venting device in the position when the die is open.
  • Fig. 5 shows the same section as Fig. 4, but in the position when the die is closed, but before the valve is closed.
  • Fig. 6 shows the same section asFigs. 4 and 5, but in the position when the valve is'closed; 1
  • the pressure die casting machine consists of a frame l on which is mounted the die 2 consisting of the two die parts 3 and 4. These parts 3 and 4 are held together by means of a locking device.
  • This device which in general has a toggle mechanism, is by Way of simplification shown as a hydraulic cylinder 5, in which the differential piston 6 can slide, this piston acting through a rod 7 on a locking member 8, which is designed to hold the part 3 tightly pressed against part 4 of the die which itself is fixed to the frame of the machine.
  • This locking member 8 is in general supported by rods (not shown) which slide in hearings in the frame of the machine.
  • Part 3 of the die has bores for the rods 3a of an ejecting device which is known and is therefore not shown in detail or described.
  • the frame 1 has an injection sleeve 9 in which the molten metal can bepoured through the opening it). This metal can be pressed in the cavity 11 of the die 2 by the injection piston 12, which, by means of the rod 13 is connected to the plunger 14 which slides in the cylinder 15.
  • the piston 6 and the plunger 14- are actuated by hydraulic pressure which is supplied from the control station '16 of the machine by a conduit system to the cylinders 5 and 15.
  • Fluid under pressure which by way of example may be supplied by a pump, is supplied to the control station 16 of the machine by means of conduit 17.
  • the conduit 18 connects the con trol station with the cylinder 5 in order to apply pressure to one face of the piston 6 to effect closing of the die 2
  • liquid under pressure is fed without interruption to the opposite face of the piston 6 in order to cause opening of the die 2.
  • a conduit 24 connects the control station 16 with the cylinder 15 in order to feed liquid under pressure into it during the injection phase. to feed liquid under pressure to the plunger 1 in order to make it move in the opposite direction when the injection piston is to be returned to its initial positon.
  • a conduit 21 is designed 1 This channel 22 is 3 channel 22 so as to shut off this channel as soon as the die cavity 11 is filled with molten metal.
  • this valve 24 is operated by hydraulic pressure by means of the conduit '25 connected to the conduit 20 in the manner described in the machine in such a manner as to allow it to be brought into contact with die 2 during the casting opera- 1 tion and to be removed from the die 2 after the casting operation.
  • Suitable control means are provided for bringing the valve 24 in the required closing position of the channel 22 at the desired moment during the casting operation.
  • valve 24 is located at the interior of cylindrical member 28, which has the general shape of a bell.
  • This member 28 forms part of the central body 27 and has a face 29 designed to be brought into close contact with the die 2 during the casting operation in such a manner as to surround the orifice 30 of the air escape channel 22.
  • the movable central body 27 forms a differential piston with one face of larger diameter 32 and on the opposite side a face of smaller'diameter 31.
  • This differential piston 27 slides in the corresponding cylinder 33 which forms the main valve body,
  • the valve 24 consists of a rod actuated by a piston 47 sliding in a cylinder bore 48 of the central body 27.
  • This cylinder bore 48 is closed at its extremity by the bell-shaped member 28 which has a threaded extension 49 screwed into bore 48.
  • the piston 47 is held in the open position of the valve 24 under the influence of spring pressure, shown diagrammatically as a single cylindrical helical spring 50.
  • Regulating means make it possible to vary the force exercised by the spring 50.
  • these regulating means consist of a screw bushing 51 which is screwed in the central part of the bell-shaped part 28 and which contacts one end of the spring 5%.
  • the exterior part of this bushing 51 is j shaped in such a manner that it can be rotated by means of a suitable tool to adjust the position of the bushing longitudinally.
  • a channel 53 is provided in the wall of central body 27 and connects the left hand part of the cylinder 48 with t the conduit 2% by means of coupling 54 and branch line i
  • the piston 47 has a pressure tight packing 55.
  • the face 29 of the bell-shaped member 28 is formed by member 56 which is screwed'onto the body of the bell-shaped member 28.
  • a filter 57 is fastened intermediate parts 28 and 56 and has an opening in the middle thereof through which the valve rod 24 can pass.
  • valve 24 is arranged in such a manner as to have its longitudinal axis parallel with the contact surface 58 of the die halves 3 and .4 of the die 2, this axis being perpendicular to the em 59 of the die in which the channel 22 is located.
  • the conduit 23 which is in communication with .the interior of the bell-shaped member 28 by means of a channel 62 enables the vacuum installation 64 to create a vacuum in the cavity 11.
  • the control lever 26 As soon as the operator has poured a quantity of molten metal intheinjection sleeve, he moves the control lever 26, from position II to position III. In this position theconduit 18 .is always under pressure to ensure locking of the die halves 3 and 4 and conduit 20 transmits fluid under pressure.
  • the actual injection phase commences by the'displacement ofthe plunger 14 in the cylinder ,15, which causes forward movement of the injection piston 12 in sleeve 9 toward the die part 3.
  • valve 24 will not be moved to a position closing channel 22 until the pressure in conduit 25 reaches a value which is greater than the spring force exercised by the spring 50. Since this force can be adjusted by H means of the bushing 51, it ispossibletochose the-moment of the closing of the channel 22 by the valve 24 59 to close the orifice of channel 22 as shown in Fig, 6.]
  • this venting device can be varied in numerous ways without departing from the spirit of the invention.
  • the differential piston 27 can be brought back to its initial position by means of hydraulic pressure acting con tinuously in bore 39, or under the influence of the force of a spring.
  • the displacement of the piston 27 towards its forward and active position may be effected by other suitable pneumatic, electrical or purely mechanical means.
  • the control valve 24 can be effected by suitable hydraulic, pneumatic, electrical or mechanical means which may or may not be independent of the circuit which controls the injection phase of the piston 12.
  • valve 24 which controls the escape channel 22 may be applied to a pressure die casting machine which is not provided with a vacuum installation 64.
  • valve 24 The special arrangement of the valve 24 described above with reference to the annexed drawings is by way of example shown on a cold chamber pressure die casting machine of the horizontal type. It is clear that this arrangement of the valve 24 can be applied to any other type of pressure die casting machine either hot or cold chamber and with either horizontal or vertical injection piston.
  • a venting device for die casting apparatus of the type having a pair of relatively movable die elements having opposed die faces between which is formed a die cavity, at least one of said die faces having a channel therein for evacuating air and gases from the die cavity, comprising valve means secured to the die casting apparatus adjacent and spaced laterally from the die elements, said valve means having a longitudinally movable sleeve therein, means for moving said sleeve longitudinally to cause one end thereof to come into contact with both die elements about the orifice of the die face channel prior' to the casting operation and for moving said sleeve away from the die elements when the injection of material into the die cavity is terminated, passage means within said movable sleeve adapted to be connected to a vacuum source for allowing air and gases to be evacuated from the die cavity when said sleeve is in contact with said die elements, and a valve element within said movable sleeve for closing the die channel at a predetermined time during the injection cycle to prevent ejection
  • a venting device as defined in claim 1 wherein said movable sleeve comprises a difierential piston.
  • a venting device as defined in claim 3 wherein the means for evacuating the die cavity includes vacuum means.
  • valve element includes a longitudinally-movable valve piston colinearly arranged within that end of the difierential piston which is adapted to contact the die, said longitudinally-movable piston being adapted to close the orifice of the die channel and thus terminate evacuation of the die cavity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US710085A 1957-10-01 1958-01-20 Venting device for die casting machines Expired - Lifetime US2867869A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH1132688X 1957-10-01
CH1211694X 1957-10-01
CH2867869X 1957-10-01

Publications (1)

Publication Number Publication Date
US2867869A true US2867869A (en) 1959-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US710085A Expired - Lifetime US2867869A (en) 1957-10-01 1958-01-20 Venting device for die casting machines

Country Status (3)

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US (1) US2867869A (xx)
CH (1) CH341952A (xx)
NL (1) NL110153C (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971230A (en) * 1959-01-02 1961-02-14 Madison Kipp Corp Die casting
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US3433291A (en) * 1965-08-16 1969-03-18 Fritz Hodler Venting of pressure molding apparatus
US3761218A (en) * 1971-08-02 1973-09-25 Pechiney Aluminium Apparatus for molding thin layers
US3802483A (en) * 1971-06-07 1974-04-09 E Blair Method of forming metal parts
US3885618A (en) * 1972-10-05 1975-05-27 Fritz Hodler Ventilation valve for closing a ventilation duct in a casting mold
US3921707A (en) * 1971-06-07 1975-11-25 Leonard H Killion Means for forming metal parts
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4538666A (en) * 1982-11-09 1985-09-03 Ube Industries, Ltd. Gas venting arrangement incorporated into a mold
US5199480A (en) * 1992-04-27 1993-04-06 Outboard Marine Corporation Sealed shot sleeve for vacuum die casting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668985A (en) * 1951-01-04 1954-02-16 Western Electric Co Molding apparatus
US2785448A (en) * 1954-06-29 1957-03-19 Hodler Fritz Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668985A (en) * 1951-01-04 1954-02-16 Western Electric Co Molding apparatus
US2785448A (en) * 1954-06-29 1957-03-19 Hodler Fritz Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971230A (en) * 1959-01-02 1961-02-14 Madison Kipp Corp Die casting
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US3433291A (en) * 1965-08-16 1969-03-18 Fritz Hodler Venting of pressure molding apparatus
US3802483A (en) * 1971-06-07 1974-04-09 E Blair Method of forming metal parts
US3921707A (en) * 1971-06-07 1975-11-25 Leonard H Killion Means for forming metal parts
US3761218A (en) * 1971-08-02 1973-09-25 Pechiney Aluminium Apparatus for molding thin layers
US3885618A (en) * 1972-10-05 1975-05-27 Fritz Hodler Ventilation valve for closing a ventilation duct in a casting mold
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4538666A (en) * 1982-11-09 1985-09-03 Ube Industries, Ltd. Gas venting arrangement incorporated into a mold
US5199480A (en) * 1992-04-27 1993-04-06 Outboard Marine Corporation Sealed shot sleeve for vacuum die casting

Also Published As

Publication number Publication date
NL110153C (xx)
CH341952A (fr) 1959-10-31

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