US2310766A - Casting metals - Google Patents

Casting metals Download PDF

Info

Publication number
US2310766A
US2310766A US299881A US29988139A US2310766A US 2310766 A US2310766 A US 2310766A US 299881 A US299881 A US 299881A US 29988139 A US29988139 A US 29988139A US 2310766 A US2310766 A US 2310766A
Authority
US
United States
Prior art keywords
pressure
casting
mold
crucible
metal
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
US299881A
Other languages
English (en)
Inventor
Dornauf Josef
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2310766A publication Critical patent/US2310766A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • a further object of the invention is to produce a very dense casting from light metals, especially such metals as aluminum or aluminum it further object of the invention is to develop a practical method of casting alloys of aluminum d silicon, especially'when modified with sodiurn, so that a very dense casting is obtained.
  • these objects of the invention are obted by placing both the crucible containing the melt and the mold under pressure. which can as '20 atmospheres in excess of atmospheric pressure, and causing the molten etal to how from the crucible into the mold while both are subjected to this pressure.
  • both the metal in the melting pot and the mold are under the same pressure, whereas in mown former methods, the metal in the mold alone had an increased pressure applied to it after the metal had been poured therein.
  • Fig. 1 is a cross-sectional view of an apparatus which may employed in the use of the castmg processof this invention.
  • Fig.3 is a photomicrograph oi a casting produced by this invention. 1
  • Fig. 3 is a photomicrograph or a casting of metal similar to that of Big. 2, but cast by conventlonal methods.
  • Fig. d is a diagram of Wiihler curves comparing metals cast by an old method and by this invention.
  • a pressure chamber which consists of a housing l, having a removable top i by bolts to. Compressed through pipe and valve t. Safety valve ii and connected to the chamber through cover 2.
  • a pressure gauge it are mold d, shown as an ordinary sand mold, is placed within the pressure chamber. Before top 2 is put in place, a crucible l containing molten metal is therein, is lowered into place on top of the mold and surrounded by a protective insulating shield d, which may be of asbestos: It to have the crucible l preheated before the molten metal is poured lowered into the chamber.
  • Crucible l includes a removable plug t in the bottom thereof, which plug is connected by pin tdto a handle lib ex:- tending through cover 2. After the crucible i has been placed within the chamber and the handle db connected to plug d, air, or other pressure producing medium, is admitted into the chamber through valve 3.
  • a pressure ranging from 5 to 20 atmospheres in excess of atmospheric pressure is built up within the flow into the mold. It is noted that the pressure is appliedto the metal in both the crucible and the mold. After the metal has solidified in the mold, the pressure is released from the chamber and-the mold removed therefrom.
  • the increased density of the castings permitted machined shapes to be produced which had firm dense surfaces.
  • a particularly advantageous discovery of the invention lies in that increased density is obtained in casings of aluminum silicon alloys which are modified with sodium, it being noted that the sodium gives a porosity which is entirely diiferent from the usual piping or porousness caused by imprisoned gases in the casting. This particular porosity occurs in the interior of the casting, while the outside surface is dense, and the porous interior is exposed when the casting is machined. I'hus, aluminum silicon alloys modified with sodium, while verydesirable for delicate castings, have been very expensive in view of the waste incurred in the machining of the castings, which necessitated the remelting of-a great many castings.
  • Fig. 2 is a photomicrograph of a section of the casing thus obtained. This casting is substan tially free of pores, and is very dense.
  • Fig. 3 is a photomicrograph of a section of the bar obtained. This photomicrcgraph shows many pores in the casting.
  • Aluminum alloys with from 0.5 to 15% silicon are beneficially treated by this method, it being noted that the best results are obtained with the eutectic alloys containing from 8% to 15% silicon.
  • Fig. 4 The results of fatigue tests are shown more clearly in Fig. 4.
  • the Wiihler curves are plotted from bar's cast from a single melt.
  • the alloy consisted of casting. Bars 40 mm. thick were cast in sand.
  • Curve A represents the fatigue strength of the bars cast under a pressure of 5 atmospheres in excess of atmospheric pressure according to the novel process of this invention, and curve B repequal conditions, the
  • a process of casting metals under pressure irom a crucible to a mold which comprises passing molten metal from the crucible to the mold while simultaneously subjecting the metal in the crucible and in the mold to a pressure of at least five atmospheres in excess of atmospheric pressure.
  • a process of casting light metal alloys to form castings substantially free from pores and oi great fatigue strength comprising pouring molten metal into a mold while simultaneously subjecting both the metal being poured and the mold to substantially the same increase in atmostaining the alloy in molten form,
  • pheric pressure amounting to at least 5 atmospheres.
  • a process of casting metals which com prises placing a crucible containing molten metal, and a mold for receiving the molten metal, within a pressure chamber, creating a pressure of at least five atmospheres in excess of atmospheric pressure within said chamber, and pouring the metal from the crucible into the mold while maintaining said pressure.
  • a process of casting aluminum alloyed with from 0.5% to 15% silicon which comprises placing a crucible containing the alloy in molten form, and a mold for receiving said molten alloy, within a pressure chamber, creating a pressure of at least five atmospheres in excess of atmospheric pressure within said chamber, and pouring the molten alloy from the crucible into the mold while maintaining said pressure.
  • a process of casting aluminum alloyed with from 8% to 15% silicon and further treated with sodium which comprises placing a crucible con and a mold for receiving said molten alloy, within a pressure chamber, creating a pressure of at least five atmospheres in excess of atmospheric pressure within said chamber, and pouring the molten alloy from the crucible into the mold while'maintaming said pressure.
  • a process of casting aluminum alloyed with from 0.5% to 15% silicon, manganese, magnesium and alkali metals which comprises placing a crucible containing the alloy in molten form, within a pressure chamber, creating a pressure of at least five atmospheres in excess of atmospheric pressure within said chamber, and pouring the molten alloy from the crucible into the mold while maintaining said pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US299881A 1938-12-07 1939-10-17 Casting metals Expired - Lifetime US2310766A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE214438X 1938-12-07
IT170239X 1939-02-17

Publications (1)

Publication Number Publication Date
US2310766A true US2310766A (en) 1943-02-09

Family

ID=25761688

Family Applications (1)

Application Number Title Priority Date Filing Date
US299881A Expired - Lifetime US2310766A (en) 1938-12-07 1939-10-17 Casting metals

Country Status (3)

Country Link
US (1) US2310766A (lt)
CH (1) CH214438A (lt)
NL (1) NL51296C (lt)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745154A (en) * 1950-05-02 1956-05-15 Siam Improvements relating to the moulding of foundry casting, particularly for light alloys
US2787537A (en) * 1946-08-15 1957-04-02 Harley A Wilhelm Method of producing metal
US2821757A (en) * 1951-07-17 1958-02-04 Edson L Wood Apparatus for the precision casting of soft metal molds
US2892225A (en) * 1954-06-23 1959-06-30 Buhrer Erwin Process and means for casting system for operating pouring ladles
US3162909A (en) * 1961-10-25 1964-12-29 Griffin Wheel Co Apparatus for pressure pouring articles
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3201837A (en) * 1962-04-06 1965-08-24 Griffin Wheel Co Method and apparatus for casting metal articles
US4205721A (en) * 1977-03-23 1980-06-03 Georg Fischer Aktiengesellschaft Apparatus for filling a casting mold
US4478270A (en) * 1981-04-01 1984-10-23 Interlake, Inc. Apparatus for casting low-density alloys
WO1987007856A1 (en) * 1986-06-17 1987-12-30 Georg Fischer Aktiengesellschaft Process for casting molten metal
US20080047487A1 (en) * 2006-07-14 2008-02-28 Georgia Tech Research Corporation In-situ flux measurement devices, methods, and systems

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787537A (en) * 1946-08-15 1957-04-02 Harley A Wilhelm Method of producing metal
US2745154A (en) * 1950-05-02 1956-05-15 Siam Improvements relating to the moulding of foundry casting, particularly for light alloys
US2821757A (en) * 1951-07-17 1958-02-04 Edson L Wood Apparatus for the precision casting of soft metal molds
US2892225A (en) * 1954-06-23 1959-06-30 Buhrer Erwin Process and means for casting system for operating pouring ladles
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3162909A (en) * 1961-10-25 1964-12-29 Griffin Wheel Co Apparatus for pressure pouring articles
US3201837A (en) * 1962-04-06 1965-08-24 Griffin Wheel Co Method and apparatus for casting metal articles
US4205721A (en) * 1977-03-23 1980-06-03 Georg Fischer Aktiengesellschaft Apparatus for filling a casting mold
US4478270A (en) * 1981-04-01 1984-10-23 Interlake, Inc. Apparatus for casting low-density alloys
WO1987007856A1 (en) * 1986-06-17 1987-12-30 Georg Fischer Aktiengesellschaft Process for casting molten metal
US20080047487A1 (en) * 2006-07-14 2008-02-28 Georgia Tech Research Corporation In-situ flux measurement devices, methods, and systems
US8261690B2 (en) * 2006-07-14 2012-09-11 Georgia Tech Research Corporation In-situ flux measurement devices, methods, and systems
US8360002B2 (en) * 2006-07-14 2013-01-29 Georgia Tech Research Corporation In-situ flux measurement devices, methods, and systems
US8377518B2 (en) * 2006-07-14 2013-02-19 Georgia Tech Research Corporation In-situ flux measurement devices, methods, and systems

Also Published As

Publication number Publication date
NL51296C (lt)
CH214438A (de) 1941-04-30

Similar Documents

Publication Publication Date Title
US2310766A (en) Casting metals
US5058653A (en) Process for lost foam casting of metal parts
US3703922A (en) Process for the manufacture of nodular cast iron
Kearney et al. Aluminum foundry products
US5161595A (en) Process for the lost foam casting, under low pressure, of aluminium alloy articles
US3928028A (en) Grain refinement of copper alloys by phosphide inoculation
US5014764A (en) Lost-foam casting of aluminum under pressure
JPS59189055A (ja) 気孔巣の少ないダイカスト品の製造方法
CN108927504A (zh) 一种铝合金大型发动机机匣零件的铸造工艺
US2670284A (en) Production of nonferrous alloys
US3598170A (en) Fluid-mold casting process
US3373794A (en) Ferroalloy casting process
Fred Major Aluminum and aluminum alloy castings
IE893715A1 (en) Improvement to the process for the lost-foam casting under¹pressure of metal articles
US1387900A (en) Alloy
US3672918A (en) Hot tops
US3993474A (en) Fluid mold casting slag
IE63394B1 (en) A process for the lost-foam casting under pressure of metal articles
US3744546A (en) Oxygen flushing pressure die-casting method
US3477682A (en) Ingot mold with hot top and refractory lining for inducing progressive axial solidification
JPH0890152A (ja) 高強度アルミニウム合金鋳物の製造方法
US2768102A (en) Wrought nickel bronze
US3513903A (en) Apparatus for casting ingots
US3225399A (en) Casting process using borax-silica slag
US929777A (en) Process of producing coated metal objects.