US3106002A - Die-casting method - Google Patents

Die-casting method Download PDF

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Publication number
US3106002A
US3106002A US48093A US4809360A US3106002A US 3106002 A US3106002 A US 3106002A US 48093 A US48093 A US 48093A US 4809360 A US4809360 A US 4809360A US 3106002 A US3106002 A US 3106002A
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US
United States
Prior art keywords
die
metal
casting
forging
heavy
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.)
Expired - Lifetime
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US48093A
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English (en)
Inventor
Alfred F Bauer
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.)
NL Industries Inc
Original Assignee
Nat Lead Co
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
Priority to NL267998D priority Critical patent/NL267998A/xx
Application filed by Nat Lead Co filed Critical Nat Lead Co
Priority to US48093A priority patent/US3106002A/en
Priority to GB28035/61A priority patent/GB933671A/en
Priority to FR870280A priority patent/FR1298610A/fr
Priority to CH931361A priority patent/CH400468A/de
Priority to DEN20427A priority patent/DE1211765B/de
Application granted granted Critical
Publication of US3106002A publication Critical patent/US3106002A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
    • 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
    • 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
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion

Definitions

  • This invention relates to a method and apparatus for forming metallic parts and is particularly directed to a method of improving the physical properties of parts produced by pressure die-casting. While the invention is useful broadly in the die-casting art it is particularly applicable to die-casting of light metals such as aluminum and magnesium and their alloys.
  • the thick or heavy sections thus act in a manner somewhat analogous to the action of risers for the thin sections with the result that the thin sections are sounder and the porosity occurs almost entirely in the heavy sections. Because this result has been well recognized, the art has avoided the accumulation of metal in thick sections such as bosses and at intersections in the casting wherever possible and has gone to great lengths to relieve this accumulation by coring and by redesigning the parts.
  • the primary object of the present invention is to pro- 3,106,002 Patented Oct. 8, 1963 vide a method and apparatus for producing die-castings in which heavy sections of non-porous metal having excellent grain structure and high mechanical strength can be made.
  • Another object of the invention is to provide a method and apparatus for producing die-castings in which a heavy section, fed through or adjacent to a thin section, may have the same grain structure and mechanical strength as the adjacent thin section of the part.
  • Another object of the invention is to provide a method of producing a part by a combined pressure die-casting and forging operation, the forging being relied upon to improve the grain structure, and reduce the porosity of a heavy section, and to improve greatly its mechanical strength.
  • the present invention provides a method of forming a sound, non-porous body of die-cast metal, under the usual die casting pressures by casting the metal into a die cavity having a portion that will form a thick or heavy section in the final part, permitting the cast part to solidify in the die to a temperature at least 50 F. below the liquidus point, but not more than 200 F. below such point so that the part, while solid, will retain a fair degree of plasticity, and finally applying a localized forging pressure of, for example, 80,000 p.s.i. to the heavy section while the part is still in its original position in the die. Thereafter the part is ejected in the usual manner. I have found that, in parts made in accordance with this practice, the heavy section is without porosity and of fine grain structure.
  • FIG. 1 is a central vertical sectional view through a die and shot end of a die-casting machine, with the die closed and indicating metal being ladled into the shot sleeve;
  • FIG. 2 is a view similar to FIG. 1 with the parts shown in the position occupied at the end of the injection stroke of the shot plunger, the die being filled;
  • FIG. 3 is a view similar to FIG. 1 with the parts shown in the position occupied after the forging step;
  • FIGS. 4 and 5 are views similar to FIG. 1 with the parts shown in the positions occupied after the dies are opened and the casting ejected, respectively;
  • FIGS. 6 and 7 are somewhat enlarged diagrammatic sectional views of the casting alone, before and after forging.
  • FIG. 8 is a view similar to FIG. 7 showing a casting after completion of a modified forging step.
  • a die-casting machine of the cold chamber type is designated generally 10 and includes a stationary platen 12 carrying a cover die 14, and a movable platen 16 carrying a complemental ejector die half 18.
  • the dies are shown as being arranged for the casting of a cylindrical article having a relatively thin wall 20 with a heavy boss or projection 22 extending from one side thereof.
  • the boss represents a mass of metal which will require a much longer time to solidify in the die than the adjacent thin wall sections.
  • the die cavity formed by the mating die halves 14 and 18 is fed through a gate 24 from a conventional shot sleeve 26 having a shot plunger 28 reciprocable therein.
  • a pour opening 30 is provided in the shot sleeve for the reception of a charge of molten metal.
  • the die is provided with a laterally movable core 32 and with appropriate ejector pins 34.
  • the par-ts so far described are conventional and are shown apart from their conventional operating devices such as are commonly used for the reciprocation of the ejector die 18, the shot plunger 28-, the core 32 and the ejector pins 34.
  • the die cavity of the cover die 14 is formed with an extension 36 connecting directly with that portion of the cavity which forms the boss 22.
  • This extension is prefer ably cylindrical, although it may be rectangular in cross section and unequal in its several dimensions, depending on the shape of the boss as will be hereinafter described.
  • a forging plunger 38 normally held in a retracted position forms the outer wall of the cavity of the die extension 36 and may be circular and of the same diameter as the die extension or of a lesser diameter.
  • the plunnger 38 is connected to a forging piston 40 which is reciprocated by fluid pressure in a cylinder 42 mounted in or on the stationary platen 12.
  • the cylinder 42 and its piston 40 may be carried in the eject-or die 18 or, if desired, may be mounted in such a manner that the piston 40 reciprocates between the die halves in a manner similar to the reciprocation of the movable core 32.
  • the direction of movement relative to the casting and the location of the forging plunger will vary depending on the shape and location of the heavy section of the part being cast.
  • the forging cylinder 42 is provided with fluid connections 44 and 46 on each side of the piston 40 so that the piston may be moved with a positive force in either direction in its cylinder, which is thus a double-acting cylinder.
  • a single-acting cylinder may be used as a means to apply a forging pressure to the piston 40 and thus to the normally retracted forging plunger 38, if desired.
  • the casting chosen to illustrate the operation of the present invention has a relatively thin wall portion 20 and an adjacent heavy section in the boss or extension 22.
  • Such a part is difficult to die-cast with known methods for the reason that the boss 22 will exhibit a high degree of porosity in the finished casting.
  • This porosity is caused by passage of the metal from the heavy section back into the adjacent thin sections to compensate for the volume shrinkage of the thin sections upon cooling.
  • This shrinkage is substantial, particularly in aluminum and magnesium alloy castings and is, of course, unavoidable.
  • risers can be used to supply the molten metal needed to make up for shrinkage both in the thin sections and in the thick sections, but in diecasting this is not possible.
  • the present invention provides a means and a method to correct the deficiencies of the heavy sections and results in a casting which is free from voids and in which the grain structure and physical properties of the cast ings are uniform throughout the thin and thick sections alike.
  • the method of the present invention comprises introducing molten metal into the die under normal pressures usually used in cold chamber machines, for example 6000 p.s.i. to 12,000 p.s.i. At this pressure it is not difficult to fill a die completely if the die is properly vented and properly designed and gated. Thus, the molten metal of the charge enters equally well into the thin and heavy sections and into the die extension 36 in front of the forging plunger 38. The metal rapidly in the die and, during solidification, shrinks in volume. After a few seconds the metal even in the heavy section freezes. When the metal has solidified but while it is at a temperature of between 50 F. and 200 F.
  • a forging pressure is applied by admitting fluid (either air or oil) to the forging cylinder 42.
  • the area ratio of the forging piston 40 and the forging plunger 38 and the pressure behind the piston are so chosen that the localized forging pressure applied to the casting is in the neighborhood of 80,000 psi. if an aluminum alloy is being cast.
  • the forging pressure forces the metal from the die extension 36 into the boss solidifies or heavy section 22 and all of the pores or voids left by shrinkage are completely closed.
  • the forging pressure exerted on the metal con tained in the die extension 36 is sufiicient to force out of the die extension and into the boss or heavy section 22 a volume of metal approximately equal to the total volume of the pores or voids.
  • the pores or voids are thus completely filled with metal.
  • the grain structure of the boss or heavy section is refined by hot working. Forcing a lesser quantity of metal out of the die extension 22 may result in some residual porosity, of the heavy section, but the advantage of grain refinement and some increase in strength of the part will still obtain, but to a somewhat lesser extent.
  • the time of application of the forging pressure is related primarily to the temperature of the casting. If the casting is allowed to cool to too low a temperature it is possible that the localized high pressure will cause cracks and distortion of the casting unless the alloy being cast is very dutile and capable of being cold worked. If the pressure is applied while the interior of the boss or heavy section is still molten, the metal will not undergo the desired grain refinement by reason of the forging step.
  • the die extension 35 in which metal is accumulated for the forging step has been described as circular in cross section. If the heavy section of the casting is greatly elongated, it will be preferable to use a forging plunger which has an elongated or rectangular face in order that the metal forced into the heavy section by forging may be more evenly distributed throughout the mass of the heavy section.
  • grain refinement and porosity reduction of a heavy section that will ultimately include a tapped hole or similar opening may be accomplished by displacing, by forging, the metal of the section itself prior to its removal from the die. This is most readily accomplished by driving a forging plunger 38 into the newly solidified metal.
  • the plunger 33 may be pointed, if desired, so that a tap may enter the hole left thereby without difiiculty.
  • the displacement of the metal from one area of the heavy section to the surrounding areas fills all of the voids and the force of the forging tool works the metal to assure a dense, fine grain structure in the completed casting.
  • the present invention is especially useful in die-casting blades for turbines or centrifugal compressors.
  • the hub portion is massive and of relatively large cross section while the blade portion itself is usually thin in cross section.
  • a dense, non-porous hub can be produced having grain properties similar to those of the blade portion.
  • the method of forming a sound, non-porous body of die-cast metal which comprises casting metal under pressure into a die cavity having a portion forming a heavy section of a die-cast body, lowering the temperature of the interior of the casting to between F. and 200 F. below the liquidus point, displacing metal within said heavy section by forcing a displacing member into said heavy section under forging pressure, withdrawing said displacing member, and ejecting the cast and forged body from the die.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US48093A 1960-08-08 1960-08-08 Die-casting method Expired - Lifetime US3106002A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL267998D NL267998A (de) 1960-08-08
US48093A US3106002A (en) 1960-08-08 1960-08-08 Die-casting method
GB28035/61A GB933671A (en) 1960-08-08 1961-08-02 Die casting method and apparatus
FR870280A FR1298610A (fr) 1960-08-08 1961-08-07 Procédé et machine pour le moulage sous pression de pièces métalliques
CH931361A CH400468A (de) 1960-08-08 1961-08-08 Verfahren und Vorrichtung zum Spritzgiessen eines Gefüges
DEN20427A DE1211765B (de) 1960-08-08 1961-08-08 Verfahren und Vorrichtung zum lunker- und porenfreien Druckgiessen von Metallkoerpern stark unterschiedlicher Wandstaerke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48093A US3106002A (en) 1960-08-08 1960-08-08 Die-casting method

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US3106002A true US3106002A (en) 1963-10-08

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US (1) US3106002A (de)
CH (1) CH400468A (de)
GB (1) GB933671A (de)

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120038A (en) * 1962-08-29 1964-02-04 Cast Forge Corp High pressure permanent molding
US3503247A (en) * 1966-01-27 1970-03-31 Josef K Murek Grey iron treatment
US3554272A (en) * 1968-03-07 1971-01-12 Multifastener Corp D B A Cast Die casting apparatus and method for casting articles from molten material having a plurality of horizontally and vertically movable dies
US3612153A (en) * 1969-09-05 1971-10-12 Nat Lead Co Method and apparatus for diecasting including a flash cavity
US3685569A (en) * 1970-07-30 1972-08-22 Gen Electric Method for gravity pressure permanent molding
US3752213A (en) * 1971-07-13 1973-08-14 Nippon Light Metal Co Oxygen flush die casting method and apparatus
US3769696A (en) * 1970-05-12 1973-11-06 Toyoda Chuo Kenkyusho Kk Process for making a flanged metal product having raised portions around its flange
US3802483A (en) * 1971-06-07 1974-04-09 E Blair Method of forming metal parts
US3810505A (en) * 1970-12-07 1974-05-14 R Cross Die casting method
JPS5062126A (de) * 1973-10-04 1975-05-28
DE2517140A1 (de) * 1974-04-19 1975-11-20 Nippon Light Metal Co Druckgussverfahren
US3921707A (en) * 1971-06-07 1975-11-25 Leonard H Killion Means for forming metal parts
JPS51104429A (en) * 1975-03-12 1976-09-16 Sadakichi Sugimura Daikyasutochuzono ketsukanboshiho
JPS51129817A (en) * 1975-05-07 1976-11-11 Nissan Motor Metal mould casting apparatus with pressure device
JPS5285020A (en) * 1976-01-07 1977-07-15 Sadakichi Sugimura Method of vacuum die casting
US4049040A (en) * 1975-08-07 1977-09-20 N L Industries, Inc. Squeeze casting apparatus and method
US4157607A (en) * 1976-12-22 1979-06-12 Ford Motor Company Method of manufacturing an internal combustion engine cylinder head
WO1980001658A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression
WO1980001657A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression
WO1980001656A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression et appareillage
WO1980001655A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Machines de coulee sous pression
DE3101841A1 (de) * 1980-01-21 1981-11-19 Honda Giken Kogyo K.K., Tokyo Verfahren zum einspritzen geschmolzenen metalles in einer vertikalen druckgussmaschine
DE3111097A1 (de) * 1980-03-21 1982-01-21 Dana Corp., 43697 Toledo, Ohio "verfahren zum verbessern der metallurgischen verbindung zwischen einem eisenmetalleinsatz und einem aluminium-gusskoerper"
US4354545A (en) * 1980-05-16 1982-10-19 Goldhammer Walter M Modified pressure casting process
US4446907A (en) * 1980-10-14 1984-05-08 Nippondenso Co., Ltd. Die-casting method
US4499941A (en) * 1980-05-16 1985-02-19 Goldhamer Walter M Modified pressure casting process and machine
US4519437A (en) * 1982-07-23 1985-05-28 Logvinov Anatoly A Casting-by-squeezing mold
US4779666A (en) * 1982-06-23 1988-10-25 General Motors Corporation Die casting process and apparatus comprising in-die plunger densification
US4779665A (en) * 1982-08-16 1988-10-25 General Motors Corporation Die casting apparatus and process comprising in-die plunger densification to form a bore through a product casting
US4846252A (en) * 1987-08-24 1989-07-11 Honda Giken Kogyo Kabushiki Kaisha Secondary pressurization casting method
US4884621A (en) * 1987-06-13 1989-12-05 Honda Giken Kogyo Kabushiki Kaisha Hydraulic control method for implements
US4955121A (en) * 1986-07-09 1990-09-11 Honda Giken Kogyo Kabushiki Kaisha Method for producing a rocker arm for use in an internal combustion engine
DE3938079A1 (de) * 1989-11-16 1991-05-23 Bayerische Motoren Werke Ag Giesswerkzeug mit einer nachverdichtungseinheit
US5211216A (en) * 1991-09-23 1993-05-18 Gibbs Die Casting Aluminum Corporation Casting process
US5263531A (en) * 1991-09-23 1993-11-23 Gibbs Die Casting Aluminum Corporation Casting process using low melting point core material
DE19529279C1 (de) * 1995-08-09 1996-11-21 Bayerische Motoren Werke Ag Druckgießmaschine
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
RU2172226C2 (ru) * 1998-03-02 2001-08-20 Владимирский государственный университет Способ изготовления отливок деталей газо- и пневмоарматуры
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
US20040231820A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
US20040231821A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using three chambers
US20040231819A1 (en) * 2003-05-19 2004-11-25 Takata Corporation Vertical injection machine using gravity feed
US20080189937A1 (en) * 2007-02-08 2008-08-14 Singatron Enterprise Co., Ltd. Method of making a connector with an injection-molding technique
CN102615269A (zh) * 2011-02-01 2012-08-01 昶联金属材料应用制品(广州)有限公司 制造包含复数层金属之壳体的方法及装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102554196A (zh) * 2010-12-15 2012-07-11 山东黄金矿业(莱州)有限公司三山岛金矿 金板铸造装置

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Publication number Priority date Publication date Assignee Title
US2112342A (en) * 1935-02-07 1938-03-29 Lester Engineering Co Pressure casting machine
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2411199A (en) * 1943-08-19 1946-11-19 Westinghouse Electric Corp Steam iron

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2112342A (en) * 1935-02-07 1938-03-29 Lester Engineering Co Pressure casting machine
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2411199A (en) * 1943-08-19 1946-11-19 Westinghouse Electric Corp Steam iron

Cited By (69)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120038A (en) * 1962-08-29 1964-02-04 Cast Forge Corp High pressure permanent molding
US3503247A (en) * 1966-01-27 1970-03-31 Josef K Murek Grey iron treatment
US3554272A (en) * 1968-03-07 1971-01-12 Multifastener Corp D B A Cast Die casting apparatus and method for casting articles from molten material having a plurality of horizontally and vertically movable dies
US3612153A (en) * 1969-09-05 1971-10-12 Nat Lead Co Method and apparatus for diecasting including a flash cavity
US3769696A (en) * 1970-05-12 1973-11-06 Toyoda Chuo Kenkyusho Kk Process for making a flanged metal product having raised portions around its flange
US3685569A (en) * 1970-07-30 1972-08-22 Gen Electric Method for gravity pressure permanent molding
US3810505A (en) * 1970-12-07 1974-05-14 R Cross Die casting method
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
US3752213A (en) * 1971-07-13 1973-08-14 Nippon Light Metal Co Oxygen flush die casting method and apparatus
JPS5062126A (de) * 1973-10-04 1975-05-28
DE2517140A1 (de) * 1974-04-19 1975-11-20 Nippon Light Metal Co Druckgussverfahren
JPS51104429A (en) * 1975-03-12 1976-09-16 Sadakichi Sugimura Daikyasutochuzono ketsukanboshiho
JPS51129817A (en) * 1975-05-07 1976-11-11 Nissan Motor Metal mould casting apparatus with pressure device
US4049040A (en) * 1975-08-07 1977-09-20 N L Industries, Inc. Squeeze casting apparatus and method
JPS5285020A (en) * 1976-01-07 1977-07-15 Sadakichi Sugimura Method of vacuum die casting
US4157607A (en) * 1976-12-22 1979-06-12 Ford Motor Company Method of manufacturing an internal combustion engine cylinder head
DE2953474C2 (de) * 1979-02-14 1984-06-07 Nippondenso Co., Ltd., Kariya, Aichi Druckgießverfahren mit Nachverdichtung
WO1980001657A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression
WO1980001656A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression et appareillage
WO1980001655A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Machines de coulee sous pression
US4380261A (en) * 1979-02-14 1983-04-19 Nippondenso Co., Ltd. Die-casting method
WO1980001658A1 (fr) * 1979-02-14 1980-08-21 Nippon Denso Co Procede de coulee sous pression
DE2953436C2 (de) * 1979-02-14 1987-04-16 Nippondenso Co. Ltd., Kariya, Aichi Druckgiessmaschine
US4497359A (en) * 1979-02-14 1985-02-05 Nippondenso Co., Ltd. Die-casting method
DE2953435C2 (de) * 1979-02-14 1990-11-15 Nippondenso Co., Ltd., Kariya, Aichi Druckgießmaschine zur Durchführung eines Druckgießverfahrens mit Nachverdichtung
DE3101841A1 (de) * 1980-01-21 1981-11-19 Honda Giken Kogyo K.K., Tokyo Verfahren zum einspritzen geschmolzenen metalles in einer vertikalen druckgussmaschine
DE3111097A1 (de) * 1980-03-21 1982-01-21 Dana Corp., 43697 Toledo, Ohio "verfahren zum verbessern der metallurgischen verbindung zwischen einem eisenmetalleinsatz und einem aluminium-gusskoerper"
US4354545A (en) * 1980-05-16 1982-10-19 Goldhammer Walter M Modified pressure casting process
US4499941A (en) * 1980-05-16 1985-02-19 Goldhamer Walter M Modified pressure casting process and machine
US4446907A (en) * 1980-10-14 1984-05-08 Nippondenso Co., Ltd. Die-casting method
US4779666A (en) * 1982-06-23 1988-10-25 General Motors Corporation Die casting process and apparatus comprising in-die plunger densification
US4519437A (en) * 1982-07-23 1985-05-28 Logvinov Anatoly A Casting-by-squeezing mold
US4779665A (en) * 1982-08-16 1988-10-25 General Motors Corporation Die casting apparatus and process comprising in-die plunger densification to form a bore through a product casting
US4955121A (en) * 1986-07-09 1990-09-11 Honda Giken Kogyo Kabushiki Kaisha Method for producing a rocker arm for use in an internal combustion engine
US4884621A (en) * 1987-06-13 1989-12-05 Honda Giken Kogyo Kabushiki Kaisha Hydraulic control method for implements
US4846252A (en) * 1987-08-24 1989-07-11 Honda Giken Kogyo Kabushiki Kaisha Secondary pressurization casting method
DE3938079A1 (de) * 1989-11-16 1991-05-23 Bayerische Motoren Werke Ag Giesswerkzeug mit einer nachverdichtungseinheit
US5211216A (en) * 1991-09-23 1993-05-18 Gibbs Die Casting Aluminum Corporation Casting process
US5263531A (en) * 1991-09-23 1993-11-23 Gibbs Die Casting Aluminum Corporation Casting process using low melting point core material
DE19529279C1 (de) * 1995-08-09 1996-11-21 Bayerische Motoren Werke Ag Druckgießmaschine
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
RU2172226C2 (ru) * 1998-03-02 2001-08-20 Владимирский государственный университет Способ изготовления отливок деталей газо- и пневмоарматуры
US20040074626A1 (en) * 1998-03-31 2004-04-22 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
US6655445B2 (en) 1998-03-31 2003-12-02 Takata Corporation Injection molding method and apparatus with reduced piston leakage
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CH400468A (de) 1965-10-15
GB933671A (en) 1963-08-08

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