US3515203A - Multiple plunger injection cylinder for die casting - Google Patents

Multiple plunger injection cylinder for die casting Download PDF

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Publication number
US3515203A
US3515203A US724926A US3515203DA US3515203A US 3515203 A US3515203 A US 3515203A US 724926 A US724926 A US 724926A US 3515203D A US3515203D A US 3515203DA US 3515203 A US3515203 A US 3515203A
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Prior art keywords
injection cylinder
plungers
chamber
plunger
die casting
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US724926A
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Conrad A Parlanti
George H Eashfellow
Dort Fauntleroy
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Moline Malleable Iron Co
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Moline Malleable Iron Co
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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
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons

Definitions

  • the molten metal for example ferrous or high-temperature metals having temperatures in the range of 2600 F. to 3500 F.
  • the molten metal is introduced into an injection cylinder and the metal is normally moved by a reciprocating plunger from the injection cylinder into the die cavity.
  • the extreme heat from the metal within the injection cylinder chamber can damage the plunger.
  • This is overcome by having a plurality of plungers so arranged so that the plungers are sequentially positioned to be used in the injection cylinder chamber, thus minimizing distortion and permitting each plunger to cool before it is again utilized to move molten metal.
  • This invention relates to a die casting method and apparatus in which a plurality of sequentially positioned plungers are used to move molten metal from a die casting injection cylinder.
  • Another purpose is a die casting apparatus for use with high temperature molten metals utilizing a plurality of sequential plungers for preventing plunger distortion due to contact with the molten metal.
  • FIG. 1 is an axial section through a die casting apparatus of the type described
  • FIG. 2. is an end view of the plunger cylinder illustrated in FIG. 1.
  • an injection cylinder is indicated generally at 10 and there may be an interior chamber 12 defined by a sleeve 14.
  • the injection cylinder may take a variety of different forms, however, as shown herein, the cylinder is made up of laminations which are specifically designed to prevent temperature distortion within the injection cylinder itself.
  • the outer layer 18 is formed of a high strength steel, for example a steel having the designation H13 has been found to be satisfactory.
  • a beryllium copper alloy having high heat conductivity has been found to be satisfactory for the intermediate layer 16.
  • a heat resistant material for example Rene 41, one of the group of metals known as Super Alloys, has been found to be satisfactory for the inner layer 14. It is important that the outer layer have high strength; the intermediate layer have high heat conductivity; and the inner layer have a high degree of heat resistance.
  • temperature distortion is not only a problem with the face of the plunger, but it is also a problem in the injection cylinder itself, it is desired in some applications to heat the injection cylinder to a temperature approximating that of the temperature inside of the chamber 12 when there is metal in it.
  • a plurality of axially extending electric rods 20 may be positioned within the intermediate layer 16. These rods are effective to bring the interior of the injection cylinder or the chamber 12 up to a temperature such that the introduction of molten metal into the chamber will not cause non-linear temperature distortion.
  • the invention should not be limited to an injection cylinder which is heated by any particular means.
  • heating coils may be wound around the injection cylinder, or there may be an injection cylinder which is heated by hot gases. What is important is to prevent temperature distortion of the injection cylinder.
  • the invention should not be limited to an injection cylinder which is heated.
  • cooling fins which extend radially out from the injection cylinder may be utilized to rapidly dissipate the additional heat added to the injection cylinder by the introduction of molten metal therein. In such instances, temperature distortion is minimized. and, to a large extent, eliminated by the rapid dissipation of heat from the injection cylinder.
  • the plunger may have means for compensating for high temperatures, it can still cause damage to the injection cylinder if the temperature of the injection cylinder is not itself also stabilized.
  • the injection cylinder 10 may have an open end 22 which has direct access to a die cavity.
  • the cover side of the die is indicated at 24 and may be suitably attached to a platen 26 by means of a platen adapter or the like 28.
  • the details of the die and the attachment of the die to the injection cylinder are not important. What is important is to provide a die casting injection cylinder which can readily introduce molten metal directly into the die cavity.
  • the injection cylinder may be completed by a molten metal feed passage 3(l which opens into the chamber 12 at the end of the chamber away from the open end 22.
  • a cylinder is indicated generally at 32 and may include a plurality of axially extending passages 34. Within each of the passages 34 is a plunger 36. Each of the plungers is of a size and is so arranged that When it is in axial alignment with the chamber 12, it may be operated to drive molten metal within the chamber 12 into the die cavity.
  • the mechanism for actually operating the plungers may be conventional and may be of the general type used with the single plunger arrangements now in use in injection cylinders.
  • the mechanism for rotating the cylinder 32 may be conventional. One requirement is that the timing of the rotation of the injection cylinder 32. be coordinated with 3 the introduction of molten metal through the passage 30 into the chamber 12.
  • each of the plungers will be individually operated by suitable hydraulic, pneumatic, or other satisfactory operating means.
  • the invention should not be limited to any particular arrangement for moving the sequentially positioned plungers. What is important is to provide a plurality of plungers, which can be used in sequence, and means for moving the plungers so that their sequential operation is assured.
  • the particular makeup of the plunger is not important, nor is its size or shape.
  • the invention is particularly directed to eliminating temperature distortion at the end 42 of the plunger which is actually in contact with the molten metal when the plunger is within the injection cylinder.
  • the means for eliminating temperature distortion of the injection cylinder itself may vary.
  • the injection cylinder may be heated to provide a crucible effect.
  • the injection cylinder may be rapidly cooled by the use of radiating fins, again to eliminate temperature distortion.
  • a mold having an input opening, an injection cylinder positioned adjacent said mold, an open-ended chamber in said injection cylinder, a molten metal feed passage opening into said chamber, one open end of said chamber being in alignment with said mold input opening, a plurality of injection cylinder plungers, carrier means supporting said plungers and adapted for positioning one of said plungers at the other open end of said chamber for use in injecting molten metal from the chamber into the mold, and means supporting said carrier means and adapted for moving said plurality of plungers, as a group, for positioning different plungers at the other open end of said chamber.
  • the structure of claim 1 further characterized by and including means for reducing temperature distortion of the injection cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

June 2 1970 c, PARLANn ET AL MULTIPLE PLUNGER INJECTION CYLINDER FOR DIE CASTING Filed April 29, 1968 States Patent OK" 3,515,203 MULTIPLE PLUNGER INJECTION CYLINDER FOR DIE CASTING Conrad A. Parlanti, Berkeley, Calif., and George H. Fashfellow, St. Charles, and Dort Fauntleroy, Geneva, 11]., assignors to Moline Malleable Iron Company, St. Charles, 11]., a corporation of Illinois Filed Apr. 29, 1968, Ser. No. 724,926 Int. Cl. B22d 17/10 US. Cl. 164-312 6 Claims ABSTRACT OF THE DISCLOSURE In the die casting of molten metal, for example ferrous or high-temperature metals having temperatures in the range of 2600 F. to 3500 F., the molten metal is introduced into an injection cylinder and the metal is normally moved by a reciprocating plunger from the injection cylinder into the die cavity. The extreme heat from the metal within the injection cylinder chamber can damage the plunger. This is overcome by having a plurality of plungers so arranged so that the plungers are sequentially positioned to be used in the injection cylinder chamber, thus minimizing distortion and permitting each plunger to cool before it is again utilized to move molten metal.
SUMMARY OF THE INVENTION This invention relates to a die casting method and apparatus in which a plurality of sequentially positioned plungers are used to move molten metal from a die casting injection cylinder.
Another purpose is a die casting apparatus for use with high temperature molten metals utilizing a plurality of sequential plungers for preventing plunger distortion due to contact with the molten metal.
Other purposes will appear in the ensuing specification, drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated diagrammatically in the following drawings wherein:
FIG. 1 is an axial section through a die casting apparatus of the type described, and
FIG. 2. is an end view of the plunger cylinder illustrated in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT In the die casting of high temperature molten metals, for example in the range of 2600 F. to 3500 F., it has been found that the end of the plunger which contacts the molten metal to move it into the die cavity becomes distorted. Such distortion can damage the plunger to the point where it will not move Within the injection cylinder. To overcome the problem of temperature distoition, we utilize a plurality of sequentially operated plungers, there being a sufficient time lapse between the use of each plunger such that it can cool down to a satisfactory temperature. It is the continuous uninterrupted use of the same plunger at high temperatures which causes distortion.
In FIG. 1, an injection cylinder is indicated generally at 10 and there may be an interior chamber 12 defined by a sleeve 14. The injection cylinder may take a variety of different forms, however, as shown herein, the cylinder is made up of laminations which are specifically designed to prevent temperature distortion within the injection cylinder itself. Surrounding the lamination 14 there is an intermediate layer or lamination 16 and Patented June 2, 1970 there may be an outer lamination or outer shell 18. The outer layer 18 is formed of a high strength steel, for example a steel having the designation H13 has been found to be satisfactory. A beryllium copper alloy having high heat conductivity has been found to be satisfactory for the intermediate layer 16. A heat resistant material, for example Rene 41, one of the group of metals known as Super Alloys, has been found to be satisfactory for the inner layer 14. It is important that the outer layer have high strength; the intermediate layer have high heat conductivity; and the inner layer have a high degree of heat resistance.
Because temperature distortion is not only a problem with the face of the plunger, but it is also a problem in the injection cylinder itself, it is desired in some applications to heat the injection cylinder to a temperature approximating that of the temperature inside of the chamber 12 when there is metal in it. For example, a plurality of axially extending electric rods 20 may be positioned within the intermediate layer 16. These rods are effective to bring the interior of the injection cylinder or the chamber 12 up to a temperature such that the introduction of molten metal into the chamber will not cause non-linear temperature distortion.
The invention should not be limited to an injection cylinder which is heated by any particular means. For example, heating coils may be wound around the injection cylinder, or there may be an injection cylinder which is heated by hot gases. What is important is to prevent temperature distortion of the injection cylinder.
In like manner, the invention should not be limited to an injection cylinder which is heated. In some applications, cooling fins which extend radially out from the injection cylinder may be utilized to rapidly dissipate the additional heat added to the injection cylinder by the introduction of molten metal therein. In such instances, temperature distortion is minimized. and, to a large extent, eliminated by the rapid dissipation of heat from the injection cylinder.
It is important to have some means in the injection cylinder for eliminating non-linear temperature distortion. Otherwise, although the plunger may have means for compensating for high temperatures, it can still cause damage to the injection cylinder if the temperature of the injection cylinder is not itself also stabilized.
The injection cylinder 10 may have an open end 22 which has direct access to a die cavity. The cover side of the die is indicated at 24 and may be suitably attached to a platen 26 by means of a platen adapter or the like 28. The details of the die and the attachment of the die to the injection cylinder are not important. What is important is to provide a die casting injection cylinder which can readily introduce molten metal directly into the die cavity. The injection cylinder may be completed by a molten metal feed passage 3(l which opens into the chamber 12 at the end of the chamber away from the open end 22.
A cylinder is indicated generally at 32 and may include a plurality of axially extending passages 34. Within each of the passages 34 is a plunger 36. Each of the plungers is of a size and is so arranged that When it is in axial alignment with the chamber 12, it may be operated to drive molten metal within the chamber 12 into the die cavity. The mechanism for actually operating the plungers may be conventional and may be of the general type used with the single plunger arrangements now in use in injection cylinders. At the center of the cylinder 22 is a shaft 38 about which the cylinder rotates. The mechanism for rotating the cylinder 32 may be conventional. One requirement is that the timing of the rotation of the injection cylinder 32. be coordinated with 3 the introduction of molten metal through the passage 30 into the chamber 12.
At the far right-hand side of FIG. 1 the plungers are all mounted in a support member 40. In normal operation, each of the plungers will be individually operated by suitable hydraulic, pneumatic, or other satisfactory operating means. As illustrated particularly in FIG. 2, there are a plurality of plungers 36 arranged in a circular or cylindrical alignment. As the cylinder 32 rotated about its shaft 38, or about its axis, the plungers 36 will sequentially be positioned for use in the injection cylinder. By having a plurality of plungers, it is possible for each of the plungers to cool down before the sequential operation will require the use of that particular plunger again.
The invention should not be limited to any particular arrangement for moving the sequentially positioned plungers. What is important is to provide a plurality of plungers, which can be used in sequence, and means for moving the plungers so that their sequential operation is assured. The particular makeup of the plunger is not important, nor is its size or shape. The invention is particularly directed to eliminating temperature distortion at the end 42 of the plunger which is actually in contact with the molten metal when the plunger is within the injection cylinder.
As mentioned above, the means for eliminating temperature distortion of the injection cylinder itself may vary. The injection cylinder may be heated to provide a crucible effect. In other applications, the injection cylinder may be rapidly cooled by the use of radiating fins, again to eliminate temperature distortion.
Whereas the preferred form of the invention has been shown and described herein, it should be realized that there are many modifications, substitutions and alterations thereto Within the scope of the following claims.
What is claimed is:
1. In a system for die casting molten metal, a mold having an input opening, an injection cylinder positioned adjacent said mold, an open-ended chamber in said injection cylinder, a molten metal feed passage opening into said chamber, one open end of said chamber being in alignment with said mold input opening, a plurality of injection cylinder plungers, carrier means supporting said plungers and adapted for positioning one of said plungers at the other open end of said chamber for use in injecting molten metal from the chamber into the mold, and means supporting said carrier means and adapted for moving said plurality of plungers, as a group, for positioning different plungers at the other open end of said chamber.
2. The structure of claim 1 further characteriezd in that said carrier means is a rotatable cylinder.
3. The stucture of claim 2 further characterized in that said supporting means has an axis offset from the axis of said injection cylinder chamber.
4. The structure of claim 1 further characterized in that said molten metal feed passage is adjacent the other open end of said chamber.
5. The structure of claim 1 further characterized in that said supporting means adapted for moving said plungers is effective to sequentially position said plungers at the other open end of the chamber.
6. The structure of claim 1 further characterized by and including means for reducing temperature distortion of the injection cylinder.
References Cited UNITED STATES PATENTS 2,610,372 9/1952 Schroeder.
2,748,933 6/1956 Deutsch.
2,961,705 11/1960 Wacker 18-30 3,153,815 10/1964 Seidl 183O ROBERT D. BALDWIN, Primary Examiner US. Cl. X.R.
US724926A 1968-04-29 1968-04-29 Multiple plunger injection cylinder for die casting Expired - Lifetime US3515203A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664411A (en) * 1969-10-25 1972-05-23 Gkn Group Services Ltd Die-casting apparatus with ceramic shot duct liner
US3672440A (en) * 1969-06-13 1972-06-27 Toshiba Machine Co Ltd Apparatus for die casting ferrous metals
US3685572A (en) * 1969-10-25 1972-08-22 Gkn Group Services Ltd Apparatus for die-casting metals
US4059143A (en) * 1975-09-03 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Method of and a means for pouring molten metal in a die casting device
US4623015A (en) * 1984-12-05 1986-11-18 Zecman Kenneth P Shot sleeve
EP0255475A2 (en) * 1986-06-27 1988-02-03 Alusuisse-Lonza Services Ag Shot sleeve for a pressure die-casting
US4926926A (en) * 1988-12-05 1990-05-22 Zecman Kenneth P Three layer shot sleeve assembly
US5012856A (en) * 1988-12-05 1991-05-07 Zecman Kenneth P Fluid cooled shot sleeve
US5611477A (en) * 1995-04-03 1997-03-18 General Motors Corporation Shot sleeve and method of making
US6059559A (en) * 1998-06-16 2000-05-09 Doweidt; Dennis P. Remote feed stock unit for an injection molding machine
US6293759B1 (en) 1999-10-31 2001-09-25 Bruno H. Thut Die casting pump
EP1302261A2 (en) * 2001-10-12 2003-04-16 ORTMANN Druckgiesstechnik GmbH Giesskammern- Giessbehälter Druckgiesswerkzeuge-Formenbau Shot sleeve for diecasting metals
US20040003911A1 (en) * 2002-06-28 2004-01-08 Thixomat, Inc. Apparatus for molding molten materials
US20040056395A1 (en) * 2002-09-25 2004-03-25 Thut Bruno H. Pump for pumping molten metal with expanded piston
US20070074842A1 (en) * 2005-09-13 2007-04-05 Peter Manoff Shot sleeve insert and method of retarding heat erosion within a shot sleeve bore
US20140090797A1 (en) * 2012-09-28 2014-04-03 Theodore A. Waniuk Vertical skull melt injection casting
US9114455B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9114456B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9731348B1 (en) 2012-03-30 2017-08-15 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9757795B1 (en) 2012-03-30 2017-09-12 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting hot sleeve for use with low iron aluminum silicon alloys
US10486229B1 (en) 2012-03-30 2019-11-26 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610372A (en) * 1949-04-20 1952-09-16 Henry F Schroeder Apparatus for reducing the porosity of castings
US2748933A (en) * 1955-01-27 1956-06-05 Alexander T Deutsch Automatic extrusion presses
US2961705A (en) * 1955-01-17 1960-11-29 George W Wacker Method and apparatus for packaging fluid molding material
US3153815A (en) * 1960-02-19 1964-10-27 Seidl Karl-Theodor Injection molding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610372A (en) * 1949-04-20 1952-09-16 Henry F Schroeder Apparatus for reducing the porosity of castings
US2961705A (en) * 1955-01-17 1960-11-29 George W Wacker Method and apparatus for packaging fluid molding material
US2748933A (en) * 1955-01-27 1956-06-05 Alexander T Deutsch Automatic extrusion presses
US3153815A (en) * 1960-02-19 1964-10-27 Seidl Karl-Theodor Injection molding apparatus

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672440A (en) * 1969-06-13 1972-06-27 Toshiba Machine Co Ltd Apparatus for die casting ferrous metals
US3664411A (en) * 1969-10-25 1972-05-23 Gkn Group Services Ltd Die-casting apparatus with ceramic shot duct liner
US3685572A (en) * 1969-10-25 1972-08-22 Gkn Group Services Ltd Apparatus for die-casting metals
US4059143A (en) * 1975-09-03 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Method of and a means for pouring molten metal in a die casting device
US4623015A (en) * 1984-12-05 1986-11-18 Zecman Kenneth P Shot sleeve
EP0255475A2 (en) * 1986-06-27 1988-02-03 Alusuisse-Lonza Services Ag Shot sleeve for a pressure die-casting
EP0255475A3 (en) * 1986-06-27 1988-10-12 Schweizerische Aluminium Ag Shot sleeve for a pressure die-casting
EP0373114A2 (en) * 1988-12-05 1990-06-13 Kenneth P. Zecman Three layer shot sleeve assembly and method of fabrication
US4926926A (en) * 1988-12-05 1990-05-22 Zecman Kenneth P Three layer shot sleeve assembly
US5012856A (en) * 1988-12-05 1991-05-07 Zecman Kenneth P Fluid cooled shot sleeve
EP0373114A3 (en) * 1988-12-05 1992-01-02 Kenneth P. Zecman Three layer shot sleeve assembly and method of fabrication
US5611477A (en) * 1995-04-03 1997-03-18 General Motors Corporation Shot sleeve and method of making
US6059559A (en) * 1998-06-16 2000-05-09 Doweidt; Dennis P. Remote feed stock unit for an injection molding machine
US6293759B1 (en) 1999-10-31 2001-09-25 Bruno H. Thut Die casting pump
EP1302261A2 (en) * 2001-10-12 2003-04-16 ORTMANN Druckgiesstechnik GmbH Giesskammern- Giessbehälter Druckgiesswerkzeuge-Formenbau Shot sleeve for diecasting metals
EP1302261A3 (en) * 2001-10-12 2003-05-02 ORTMANN Druckgiesstechnik GmbH Giesskammern- Giessbehälter Druckgiesswerkzeuge-Formenbau Shot sleeve for diecasting metals
US20040003911A1 (en) * 2002-06-28 2004-01-08 Thixomat, Inc. Apparatus for molding molten materials
CN1315599C (en) * 2002-06-28 2007-05-16 西克索马特公司 Apparatus for molding molten materials
US6736188B2 (en) * 2002-06-28 2004-05-18 Thixomat, Inc. Apparatus for molding molten materials
WO2004002657A1 (en) * 2002-06-28 2004-01-08 Thixomat, Inc. Apparatus for molding molten materials
US20040056395A1 (en) * 2002-09-25 2004-03-25 Thut Bruno H. Pump for pumping molten metal with expanded piston
US6805834B2 (en) 2002-09-25 2004-10-19 Bruno H. Thut Pump for pumping molten metal with expanded piston
US7464744B2 (en) 2005-09-13 2008-12-16 Peter Manoff Shot sleeve insert and method of retarding heat erosion within a shot sleeve bore
US20070074842A1 (en) * 2005-09-13 2007-04-05 Peter Manoff Shot sleeve insert and method of retarding heat erosion within a shot sleeve bore
US9114455B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9114456B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9731348B1 (en) 2012-03-30 2017-08-15 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9757795B1 (en) 2012-03-30 2017-09-12 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting hot sleeve for use with low iron aluminum silicon alloys
US10486229B1 (en) 2012-03-30 2019-11-26 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US11090714B1 (en) 2012-03-30 2021-08-17 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US11524334B1 (en) 2012-03-30 2022-12-13 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US20140090797A1 (en) * 2012-09-28 2014-04-03 Theodore A. Waniuk Vertical skull melt injection casting

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