US2785448A - Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines - Google Patents

Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines Download PDF

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Publication number
US2785448A
US2785448A US515385A US51538555A US2785448A US 2785448 A US2785448 A US 2785448A US 515385 A US515385 A US 515385A US 51538555 A US51538555 A US 51538555A US 2785448 A US2785448 A US 2785448A
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Prior art keywords
die
cavity
valve
air
piston
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Expired - Lifetime
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US515385A
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English (en)
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Hodler Fritz
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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
    • 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

  • This invention relates to a method of and apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines.
  • It relates more particularly to pressure die-casting machines in which the expulsion of the air from the diecavity is effected automatically and as far as timing is concerned in such a manner, that all conditions for the complete filling of said cavity are fulfilled, said expulsion being efiected by means of a valve, mounted on one of the die-halves.
  • the time required for the filling of the die-cavity i. e. the time lapse from the moment the metal reaches the point of inlet, in other words the actual entrance .to the die-cavity till the complete filling of the latter, should not exceed the mean valve of /100 of a second, failing this, the surface quality of the casting will deteriorate because of unfavourable cooling conditions.
  • the valve in order to allow air and gases contained in the die-cavity to be exhausted as completely as possible, the valve must reach its final closing position only when the metal has filled the die-cavity completely, provided always that the timing of the closing operation is such as not to allow the molten metal to pass through the valve.
  • the section of free passage of the valve must be as large as possible in order to reduce the air-resistance to a minimum.
  • the solution according to the invention utilises the increase of pressure, which is inevitable during the casting operation for the direct operation of a simple and foolproof valve Without mechanical, pneumatic or electrical auxiliary means.
  • Fig. 1 shows diagrammatically a partialview in section of the machine.
  • Fig. 2 shows a partial internal view of the die.
  • Fig. 1 the casing of which is omitted-shows a die consisting of the parts 1 and 2.
  • Part 2 shows an inner article forming cavity or recess 3 which represents the form of the piece to be cast.
  • a material inlet 4 is provided in the form of an injection sleeve, said sleeve having the opening 5 through which the molten metal can be poured.
  • This metal is then pressed into the die-cavity 3 by the action of the primary fluid piston means which includes 6, 7, 8, 9 and 10.
  • the injection piston is 6, said piston being capable of sliding in sleeve 4.
  • the injection piston 6 is connected by the rod 7 to the main piston 8 sliding in the cylinder 9.
  • Said piston 8 is actuated by hydraulic pressure which is controlled by the operator through the feed pipe 10.
  • the die has a channel 11 through which the air contained in the die-cavity and in the injection sleeve 4 can escape.
  • the valve 12 enables the channel 11 to be closed, as soon as the die-cavity 3 is filled with molten metal.
  • Said valve 12 comprises a cylindrical shaft 13 capable of sliding in a bore 14 provided in the part 2 of the die.
  • Said shaft 13 is secured to a piston 15 capable of sliding in the cylinder 16.
  • Said cylinder 16 is secured to the die part 2, for instance as shown by means of the flange 17 and the screws 18 or by any other means serving the same purpose.
  • the piston 15 is held in the rear position (to the left on the accompanying drawing) in which position the valve 12 is open, allowing the air to pass freely through the channel 11 by the force of the spring 19 or of any other means serving the same purpose.
  • the piston 15 is provided with a fluidtight lining.
  • the cylinder 16 is connected with the control cylinder 9 of the injection piston 6 by means of the pipe 21.
  • the required quantity of molten metal is introduced into the sleeve 4 through the opening 5.
  • the machine is now put into operation by allowing a liquid under pressure, for example water, to be introduced through the pipe 10 into the cylinder 9.
  • the pistons 8 and 9 then move to the left (relatively to the drawing).
  • the molten metal in the sleeve 4 is at first forced into transfer chamber 22 of the feed channel to the die-cavity 3.
  • the force exercised by the spring 19 or by other means serving the same purpose must be such as to maintain the valve 12 in its open position during this first injection phase, which is intended to fill the sleeve d and the chamber 22, in spite of the pressure occurring in the cylinder 9, the pipe 21 and the cylinder 16.
  • the point at which this increased pressure is utilised is not limited to the point at which this is effected in the embodiment shown by Way of example. Since the increase of pressure does not only occur in the cylinder 9 but also in the various organs of the hydraulic system, for instance in the pipe 19, the utilisation of the increased pressure is not limited to the point shown in the embodiment described, and therefore the pipe 21 (Fig. 1) can also be connected to the supply line 10. It will further be understood, that the advantages of the invention are not limited to the use of the valve for allowing the air to escape as described.
  • valve it is for instance possible to combine the action of the valve with means for exhausting the masses of air and gases contained in the die-cavity and free channels, at any suitable point, by known means for instance by connecting the air escape-channel 11 with an exhaust system or a vacuum pump of known construction and therefore not shown.
  • the invention is not limited to the horizontal type pressure die-casting machine shown by way of example, but that .it can be modified to he used on other types, for instance on vertical hotand cold-chamber pressure die-casting machines, provided that the ejection stroke of such machines is eifected by hydraulic means.
  • Die-casting apparatus comprising, a die having a die-casting material inlet and an article cavity, said cavity communicating with the constricted throat of a material transfer chamber which receives discharge from said inlet, said cavity also communicating with an escape channel, a valve for controlling the escape of .air and gas from the die-cavity through said channel, said valve having a spring normally biasing it to open position and a piston responsive to hydraulic pressure for moving it to closed position, hydraulic primary piston means including a cylinder and main piston for forcing casting material through said inlet, and pipe means establishing communication between the fluid pressure side of the valve piston and the main piston of the said primary piston means, whereby, as the main piston of the primary piston means moves through the initial portion of its stroke to inject material through the inlet and into the transfer chamber, the fluid pressure on the valve piston wi l not overcome the force of the valve spring and the valve will remain open to permit escape of air from the die-cavity until the material reaches the constricted throat of the transfer passage and pressure builds up behind the main piston whereupon increasing
  • Die-casting apparatus comprising, a die casing having a die-cavity communicating with an air escape channel and a material transfer chamber, the latter having a constricted throat where it joins the die-cavity, a material inlet sleeve for the casing and discharging into the transfer chamber, a valve for controlling the escape of air from .the die cavity through said channel, said valve having a spring normally biasing it to open position and a piston responsive to hydraulic pressure for moving it to closed position, hydraulic primary piston means including a cylinder and main piston for forcing casting material through said inlet sleeve, and pipe means establishing communication between the fluid pressure side of the valve piston and the main piston of the said primary piston means, whereby, as the main piston moves through its stroke to inject material through the sleeve and into the transfer chamber the valve will remain open until the material reaches the constricted throat whereupon the increased fluid pressure on the main piston to overcome the resistance created by the constricted throat will cause a rise in pressure in the cylinder of the primary
  • valve in the escape channel is in the fiorm of a rod about which the spring is coiled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US515385A 1954-06-29 1955-06-14 Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines Expired - Lifetime US2785448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2785448X 1954-06-29

Publications (1)

Publication Number Publication Date
US2785448A true US2785448A (en) 1957-03-19

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ID=4571777

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Application Number Title Priority Date Filing Date
US515385A Expired - Lifetime US2785448A (en) 1954-06-29 1955-06-14 Apparatus for the automatic expulsion of air from the die-cavity of hot and cold chamber die-casting machines

Country Status (5)

Country Link
US (1) US2785448A (fr)
BE (1) BE539021A (fr)
CH (1) CH317964A (fr)
DE (1) DE1044364B (fr)
NL (1) NL84643C (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867869A (en) * 1957-10-01 1959-01-13 Hodler Fritz Venting device for die casting machines
US2914822A (en) * 1957-08-26 1959-12-01 Mt Vernon Die Casting Corp Means for control assembly for the air vent of a die cavity
US2958104A (en) * 1958-04-21 1960-11-01 Charles W Ohse Vacuum die casting process and apparatus
US3006043A (en) * 1959-04-09 1961-10-31 Die Casting Res Foundation Inc Die casting machine and casting process
US3070857A (en) * 1957-10-30 1963-01-01 Venus Wilibald Apparatus for providing vacuum in molds
US3085302A (en) * 1956-01-19 1963-04-16 Alfred P Federman Vacuum die casting method and apparatus
US3121926A (en) * 1957-11-04 1964-02-25 Glen R Morton Vacuum system for die casting
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4463793A (en) * 1980-01-28 1984-08-07 Bayerisches Druckguss-Werk Thurner Kg Vacuum die casting machine
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4577670A (en) * 1984-07-19 1986-03-25 Ex-Cell-O Corporation Vacuum control system for casting machine dies
US5199480A (en) * 1992-04-27 1993-04-06 Outboard Marine Corporation Sealed shot sleeve for vacuum die casting
US5240402A (en) * 1992-11-23 1993-08-31 Husky Injection Molding Systems Ltd. Apparatus for preparing hollow plastic article
US5429174A (en) * 1993-07-15 1995-07-04 Aluminum Company Of America Vacuum die casting machine having improved siphon tube and associated method
US5697422A (en) * 1994-05-05 1997-12-16 Aluminum Company Of America Apparatus and method for cold chamber die-casting of metal parts with reduced porosity
US5983976A (en) * 1998-03-31 1999-11-16 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6065526A (en) * 1995-09-01 2000-05-23 Takata Corporation Method and apparatus for manufacturing light metal alloy
US6135196A (en) * 1998-03-31 2000-10-24 Takata Corporation Method and apparatus for manufacturing metallic parts by injection molding from the semi-solid state
US6474399B2 (en) 1998-03-31 2002-11-05 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US6540006B2 (en) 1998-03-31 2003-04-01 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6666258B1 (en) 2000-06-30 2003-12-23 Takata Corporation Method and apparatus for supplying melted material for injection molding
US6742570B2 (en) 2002-05-01 2004-06-01 Takata Corporation Injection molding method and apparatus with base mounted feeder
US6808008B2 (en) 2001-02-20 2004-10-26 Toshiba Kikai Kabushiki Kaisha Die casting machine
US20040226679A1 (en) * 2003-05-16 2004-11-18 Toyota Jidosha Kabushiki Kaisha Electromagnetic drive-type die casting decompression valve, drive method for such a valve, and a die casting unit
US20040231820A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US20040231819A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using gravity feed
US20040231821A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using three chambers
US20040250979A1 (en) * 2003-05-16 2004-12-16 Toshiba Kikai Kabushiki Kaisha Vacuum casting die
US20040256073A1 (en) * 2003-05-16 2004-12-23 Toshiba Kikai Kabushiki Kaisha Die casting machine and casting method
US9327428B2 (en) 2009-07-02 2016-05-03 Werner Beuerlein Casting mold comprising a breather

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912981A (en) * 1931-04-10 1933-06-06 Dow Chemical Co Method of pressure casting and means therefor
US2079936A (en) * 1934-05-25 1937-05-11 Franz Braun Akt Ges Fa Die casting machine
US2243835A (en) * 1939-06-10 1941-06-03 Western Electric Co Die casting machine
US2484907A (en) * 1946-10-07 1949-10-18 Hpm Dev Corp Fluid operable system
DE848689C (de) * 1943-04-02 1952-09-08 Mahle Werk G M B H Sicherungsvorrichtung fuer durch Kolbendruck betaetigte Spritz-oder Pressgiessmaschinen
US2634468A (en) * 1948-10-16 1953-04-14 Alfred E Holder Apparatus for pressure casting
US2668985A (en) * 1951-01-04 1954-02-16 Western Electric Co Molding apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE653608C (de) * 1936-06-14 1937-11-29 Wilhelm Metzger Steuerung fuer mit Fluessigkeitsdruck betriebene Spritzgiessmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912981A (en) * 1931-04-10 1933-06-06 Dow Chemical Co Method of pressure casting and means therefor
US2079936A (en) * 1934-05-25 1937-05-11 Franz Braun Akt Ges Fa Die casting machine
US2243835A (en) * 1939-06-10 1941-06-03 Western Electric Co Die casting machine
DE848689C (de) * 1943-04-02 1952-09-08 Mahle Werk G M B H Sicherungsvorrichtung fuer durch Kolbendruck betaetigte Spritz-oder Pressgiessmaschinen
US2484907A (en) * 1946-10-07 1949-10-18 Hpm Dev Corp Fluid operable system
US2634468A (en) * 1948-10-16 1953-04-14 Alfred E Holder Apparatus for pressure casting
US2668985A (en) * 1951-01-04 1954-02-16 Western Electric Co Molding apparatus

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3085302A (en) * 1956-01-19 1963-04-16 Alfred P Federman Vacuum die casting method and apparatus
US2914822A (en) * 1957-08-26 1959-12-01 Mt Vernon Die Casting Corp Means for control assembly for the air vent of a die cavity
US2867869A (en) * 1957-10-01 1959-01-13 Hodler Fritz Venting device for die casting machines
US3070857A (en) * 1957-10-30 1963-01-01 Venus Wilibald Apparatus for providing vacuum in molds
US3121926A (en) * 1957-11-04 1964-02-25 Glen R Morton Vacuum system for die casting
US2958104A (en) * 1958-04-21 1960-11-01 Charles W Ohse Vacuum die casting process and apparatus
US3006043A (en) * 1959-04-09 1961-10-31 Die Casting Res Foundation Inc Die casting machine and casting process
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4463793A (en) * 1980-01-28 1984-08-07 Bayerisches Druckguss-Werk Thurner Kg Vacuum die casting machine
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4577670A (en) * 1984-07-19 1986-03-25 Ex-Cell-O Corporation Vacuum control system for casting machine dies
US5199480A (en) * 1992-04-27 1993-04-06 Outboard Marine Corporation Sealed shot sleeve for vacuum die casting
US5240402A (en) * 1992-11-23 1993-08-31 Husky Injection Molding Systems Ltd. Apparatus for preparing hollow plastic article
US5429174A (en) * 1993-07-15 1995-07-04 Aluminum Company Of America Vacuum die casting machine having improved siphon tube and associated method
US5697422A (en) * 1994-05-05 1997-12-16 Aluminum Company Of America Apparatus and method for cold chamber die-casting of metal parts with reduced porosity
US6739379B2 (en) 1995-09-01 2004-05-25 Takata Corporation Method and apparatus for manufacturing light metal alloy
US6065526A (en) * 1995-09-01 2000-05-23 Takata Corporation Method and apparatus for manufacturing light metal alloy
US6241001B1 (en) 1995-09-01 2001-06-05 Takata Corporation Method and apparatus for manufacturing light metal alloy
US6655445B2 (en) 1998-03-31 2003-12-02 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US6942006B2 (en) 1998-03-31 2005-09-13 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US6283197B1 (en) 1998-03-31 2001-09-04 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6474399B2 (en) 1998-03-31 2002-11-05 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US6540006B2 (en) 1998-03-31 2003-04-01 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6135196A (en) * 1998-03-31 2000-10-24 Takata Corporation Method and apparatus for manufacturing metallic parts by injection molding from the semi-solid state
US6276434B1 (en) 1998-03-31 2001-08-21 Takata Corporation Method and apparatus for manufacturing metallic parts by ink injection molding from the semi-solid state
US20040074626A1 (en) * 1998-03-31 2004-04-22 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US5983976A (en) * 1998-03-31 1999-11-16 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6666258B1 (en) 2000-06-30 2003-12-23 Takata Corporation Method and apparatus for supplying melted material for injection molding
US6808008B2 (en) 2001-02-20 2004-10-26 Toshiba Kikai Kabushiki Kaisha Die casting machine
US20040256074A1 (en) * 2001-02-20 2004-12-23 Toshiba Kikai Kabushiki Kaisha Die casting machine
US7210517B2 (en) 2001-02-20 2007-05-01 Toshiba Kikai Kabushiki Kaisha Die casting machine
US6789603B2 (en) 2002-05-01 2004-09-14 Takata Corporation Injection molding method and apparatus with base mounted feeder
US6742570B2 (en) 2002-05-01 2004-06-01 Takata Corporation Injection molding method and apparatus with base mounted feeder
US7104308B2 (en) 2003-05-16 2006-09-12 Toshiba Kikai Kabushiki Kaisha Vacuum casting die
US20040250979A1 (en) * 2003-05-16 2004-12-16 Toshiba Kikai Kabushiki Kaisha Vacuum casting die
CN1330441C (zh) * 2003-05-16 2007-08-08 东芝机械株式会社 真空铸造用模具
US20040256073A1 (en) * 2003-05-16 2004-12-23 Toshiba Kikai Kabushiki Kaisha Die casting machine and casting method
US20040226679A1 (en) * 2003-05-16 2004-11-18 Toyota Jidosha Kabushiki Kaisha Electromagnetic drive-type die casting decompression valve, drive method for such a valve, and a die casting unit
US7017649B2 (en) 2003-05-16 2006-03-28 Toshiba Kikai Kabushiki Kaisha Die casting machine and casting method
US6923243B2 (en) * 2003-05-16 2005-08-02 Toyota Jidosha Kabushiki Kaisha Electromagnetic drive-type die casting decompression valve, drive method for such a valve, and a die casting unit
US20050022958A1 (en) * 2003-05-19 2005-02-03 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US6945310B2 (en) 2003-05-19 2005-09-20 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US6951238B2 (en) 2003-05-19 2005-10-04 Takata Corporation Vertical injection machine using gravity feed
US6880614B2 (en) 2003-05-19 2005-04-19 Takata Corporation Vertical injection machine using three chambers
US20040231821A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using three chambers
US7150308B2 (en) 2003-05-19 2006-12-19 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US20040231819A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using gravity feed
US20040231820A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US7296611B2 (en) 2003-05-19 2007-11-20 Advanced Technologies, Inc. Method and apparatus for manufacturing metallic parts by die casting
US9327428B2 (en) 2009-07-02 2016-05-03 Werner Beuerlein Casting mold comprising a breather

Also Published As

Publication number Publication date
NL84643C (fr)
BE539021A (fr) 1959-07-17
CH317964A (fr) 1956-12-15
DE1044364B (de) 1958-11-20

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