US3905415A - Method of casting parts of high melting point metal in molds - Google Patents

Method of casting parts of high melting point metal in molds Download PDF

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Publication number
US3905415A
US3905415A US441744A US44174474A US3905415A US 3905415 A US3905415 A US 3905415A US 441744 A US441744 A US 441744A US 44174474 A US44174474 A US 44174474A US 3905415 A US3905415 A US 3905415A
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US
United States
Prior art keywords
pasteboard
forms
prefabricated
dies
mold
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
Application number
US441744A
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English (en)
Inventor
Jean Henri Lefebvre
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Application granted granted Critical
Publication of US3905415A publication Critical patent/US3905415A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/065—Cooling or heating equipment for moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B22C23/02—Devices for coating moulds or cores

Definitions

  • the present invention relates generally to the die casting of metals, and more particularly concerns an improved method of die casting metals and especially such metals having high melting points, such as cast iron and steel, but also which can be used with other metals, such as aluminum, bronze and alloys of copper.
  • Another object of the present invention is to provide a method of casting parts of metals, particularly those having high melting points, in molds which will result in increased durability of the molds being used therein.
  • Still another object of this invention is to provide an improved method of casting parts of metals, particu larly those having high melting points such as certain ferrous metals wherein carbide formation is substantially precluded.
  • Yet another object of this invention is to provide an improved method of coating the molds used in the die casting of parts from high melting point metals.
  • pasteboard permits reduction of the investment in molds by virtue of the fact that the time of immobilization of the molds, due to the usual coating operations heretofore employed, is replaced here by the simple insertion in the dies of separately prefabricated forms. Moreover, the inherent insulating ability of pasteboard makes it possible to improve the quality of the castings, along with improving the endurance of the dies, by reducing the effects of surface thermal shock thereon and preventing diffusion effects at the contact with the cast metal.
  • This local reinforcement of the insulation can be used either to secure specialy annealed zones in massive pieces or more generally to permit molding of very thin pieces while maintaining a normal structure therein, which particularly is useful in the case of cast iron.
  • FIG. 1 is a longitudinal cross-section view of a camshaft mold
  • FIG. 2 is a cross-sectional view taken along the line Il-Il of FIG. 1.
  • an upper metal die 1 and a lower metal die 2 of a mold for die casting camshafts of steel or cast iron are shown meeting along a joining plane 3, wherein each of the metal dies has an imprint of a form appropriate to that of the part to be cast, which in the present case is a camshaft.
  • the pasteboard is shaped by the usual methods of the industry so as to form the two linings 4 such that they assume the exact shapes of interiors of the mold cavities, with a peripheral border 5 being provided projecting out in the joining plane 3.
  • the molten metal which can be one having a high melting point, such as steel or cast iron
  • the liquid metal coming into contact with the pasteboard causes combustion of the latter, but the refractory materials with which the pasteboard has been covered or impregnated is instantly fritted by the heat of the metal and serves in turn as the support for the burned pasteboard residues so that they are not entrained by the flow of the metal.
  • the insulating characteristic of the pasteboard considerably slows the thermal exchange between the casting and the die, so that the casting, by not being cooled too rapidly, is of improved quality, and at the same time the durability of the die is equally improved by reduction of the superficial thermal shock and suppression of diffusion phenomena at the contact of the metal being cast, since this contact is itself eliminated.
  • the casting, once solidified is much easier to strip from the moldv Still, if it is desired, one can reduce or eliminate the insulating character of the linings 4 in certain places in order to obtain a localized tempering effect, such as the example illustrated, to temper bosses 6 of the camshaft cams, by simply cutting a window in the pasteboard so that the metal can therethrough come into direct contact with the die.
  • a cooling system is preferably provided for the region facing this window, being shown here as liquid cooling zones 7.
  • the casting has a much greater surface hardness at the locations of the bosses 6 of the cams, while remaining annealed everywhere else, particularly along the axis and in the bearings 8 of the camshaft.
  • the insulation character of the linings 4 is reinforced to as much as a millimeter or more, by providing an extra thickness 10 of pasteboard, which also has the effect of protecting the casting from the nearby cooled zones 7.
  • the problem with this reinforced insulation is that the generation of gases is augmented which thereby risks producing blowholes.
  • the die may be provided with filters 11 and air exhaust passages 12, according to a technique familiar in die casting, in order to facilitate the evacuation of these gases.
  • This local reinforcement in thickness of the pasteboard has in particular the advantage of permitting the casting of thin spiders of cast iron while retaining the gray structure for the cast iron.
  • the method of the present invention is applicable to the fabrication of all sorts of castings, with particularly interesting and favorable results being shown in the case of items with variations in hardness, such as Camshafts and the like, where effective control of the tempered zones is obtained, something that is much more delicate to control in the classical techniques of casting in sand with suitable cooling.
  • the method is perfectly applicable to the fabrication of all parts containing thin sections, such as suspension arms or steering gear housings for automobiles.
  • a method of casting parts from metals having high melting points in molds comprising the steps of:
  • a method of casting parts from metals having high melting points in molds comprising the steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mold Materials And Core Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US441744A 1973-02-13 1974-02-12 Method of casting parts of high melting point metal in molds Expired - Lifetime US3905415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7305064A FR2217096B1 (xx) 1973-02-13 1973-02-13

Publications (1)

Publication Number Publication Date
US3905415A true US3905415A (en) 1975-09-16

Family

ID=9114776

Family Applications (1)

Application Number Title Priority Date Filing Date
US441744A Expired - Lifetime US3905415A (en) 1973-02-13 1974-02-12 Method of casting parts of high melting point metal in molds

Country Status (9)

Country Link
US (1) US3905415A (xx)
JP (1) JPS541454Y2 (xx)
CA (1) CA1019133A (xx)
CS (1) CS199559B2 (xx)
ES (1) ES422963A1 (xx)
FR (1) FR2217096B1 (xx)
GB (1) GB1454635A (xx)
IT (1) IT1004901B (xx)
SU (1) SU559626A3 (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695564A (en) * 1970-08-17 1972-10-03 Leonard S Suozzo Thermo-electromechanical multi-function support device
US4799531A (en) * 1986-07-31 1989-01-24 Ube Industries, Inc. Casting method in high-pressure casting
US6035922A (en) * 1996-11-14 2000-03-14 Sugitani Kinzoku Kogyo Kabushiki Kaisha Method for manufacturing a casting and apparatus therefor
US6058794A (en) * 1997-04-30 2000-05-09 Accurate Specialties, Inc. Composite sector gear and method for manufacturing same
US6443214B1 (en) * 1999-12-07 2002-09-03 Honda Giken Kogyo Kabushiki Kaisha Method for heat treating mold cast product
US6622774B2 (en) 2001-12-06 2003-09-23 Hamilton Sundstrand Corporation Rapid solidification investment casting
US20070251664A1 (en) * 2006-05-01 2007-11-01 Hanna Ihab M Casting method and mold design for optimization of material properties of a casting

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175521A (en) * 1985-05-31 1986-12-03 Perkins Engines Group Manufacture of metal castings having chill-hardened zones
FR2664187B1 (fr) * 1990-07-04 1992-09-18 Snecma Moule de fonderie pour la fabrication de pieces par solidification monocristalline.
DE4431713C2 (de) * 1994-09-06 2001-03-15 Audi Ag Vorrichtung zum Herstellen von Gußstücken
DE102013200983A1 (de) * 2013-01-22 2014-07-24 RWP Gesellschaft beratender Ingenieure für Berechnung und rechnergestützte Simulation mbH Verfahren zum Behandeln eines Bauteils

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994634A (en) * 1934-04-19 1935-03-19 New Jersey Zinc Co Method of casting stereotype plates
US2757426A (en) * 1951-10-03 1956-08-07 Joseph B Brennan Method of making mold with fibrous liner
US3266099A (en) * 1966-08-16 Harry R Bucy Mold parting line venting means
US3472308A (en) * 1966-08-29 1969-10-14 Multifastener Corp Method and apparatus for permanent mold casting
US3528478A (en) * 1968-07-25 1970-09-15 Nat Lead Co Method of die casting high melting point alloys

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR860456A (fr) * 1939-06-26 1941-01-16 Schneider & Cie Procédé et dispositif pour l'amélioration de la surface externe des lingots et autres produits de coulée
DE752384C (de) * 1942-10-30 1952-10-27 Maschf Augsburg Nuernberg Ag Auskleidung fuer Schleudergusskokillen
FR1244595A (fr) * 1958-11-28 1960-10-28 Foundry Services Int Ltd Perfectionnement à la production de lingots ou autres objets métalliques moulés

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3266099A (en) * 1966-08-16 Harry R Bucy Mold parting line venting means
US1994634A (en) * 1934-04-19 1935-03-19 New Jersey Zinc Co Method of casting stereotype plates
US2757426A (en) * 1951-10-03 1956-08-07 Joseph B Brennan Method of making mold with fibrous liner
US3472308A (en) * 1966-08-29 1969-10-14 Multifastener Corp Method and apparatus for permanent mold casting
US3528478A (en) * 1968-07-25 1970-09-15 Nat Lead Co Method of die casting high melting point alloys

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695564A (en) * 1970-08-17 1972-10-03 Leonard S Suozzo Thermo-electromechanical multi-function support device
US4799531A (en) * 1986-07-31 1989-01-24 Ube Industries, Inc. Casting method in high-pressure casting
US6035922A (en) * 1996-11-14 2000-03-14 Sugitani Kinzoku Kogyo Kabushiki Kaisha Method for manufacturing a casting and apparatus therefor
US6058794A (en) * 1997-04-30 2000-05-09 Accurate Specialties, Inc. Composite sector gear and method for manufacturing same
US6443214B1 (en) * 1999-12-07 2002-09-03 Honda Giken Kogyo Kabushiki Kaisha Method for heat treating mold cast product
US6622774B2 (en) 2001-12-06 2003-09-23 Hamilton Sundstrand Corporation Rapid solidification investment casting
US20070251664A1 (en) * 2006-05-01 2007-11-01 Hanna Ihab M Casting method and mold design for optimization of material properties of a casting

Also Published As

Publication number Publication date
DE2402893B2 (de) 1976-07-29
FR2217096A1 (xx) 1974-09-06
CA1019133A (fr) 1977-10-18
JPS541454Y2 (xx) 1979-01-23
DE2402893A1 (de) 1974-08-15
SU559626A3 (ru) 1977-05-25
GB1454635A (en) 1976-11-03
ES422963A1 (es) 1976-05-16
CS199559B2 (en) 1980-07-31
FR2217096B1 (xx) 1975-03-07
JPS49122117U (xx) 1974-10-18
IT1004901B (it) 1976-07-20

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