US2893084A - Casting mold and method of casting carbon-containing alloys - Google Patents

Casting mold and method of casting carbon-containing alloys Download PDF

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Publication number
US2893084A
US2893084A US461884A US46188454A US2893084A US 2893084 A US2893084 A US 2893084A US 461884 A US461884 A US 461884A US 46188454 A US46188454 A US 46188454A US 2893084 A US2893084 A US 2893084A
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US
United States
Prior art keywords
casting
cavity
mold
additional
carbon
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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
US461884A
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English (en)
Inventor
Eisermann Friedrich
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.)
Sulzer AG
Original Assignee
Sulzer AG
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Filing date
Publication date
Application filed by Sulzer AG filed Critical Sulzer AG
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Publication of US2893084A publication Critical patent/US2893084A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns

Definitions

  • My invention provides a new method of casting which eliminates the problem of decarbonization in the casting. It comprises forming a casting mold that has a casting cavity and an additional cavity substantially encircling the whole surface of the casting cavity and being separated therefrom by a relatively thin wall of the refractory mold material. A protective substance is then placed in the additional cavity and the casting cavity is filled with molten metal. The heat of the mold and the molten metal will cause the protective substance in the additional cavity to generate a reducing gas to blanket the cooling casting and prevent the carbon in the exposed portions of the cooling casting from oxidizing. The protective substance may be placed in the mold before or after the molten metal is poured therein. My invention also provides a mold made in accordance with the described method.
  • Fig. 1 shows a vertical cross-section through a refractory casting mold ready for casting
  • Fig. 2 shows a cross-sectional view along lines 11 of Fig. 1.
  • the flask 12 encloses a fired refractory mold material 11, the casting cavity 13 and the additional cavities 14a, 14b, 14c and 14d.
  • the casting cavities and also the additional cavities can be advantageously produced according to the lost wax process using destructible patterns having the same external configuration as the finished castings to be cast.
  • the additional cavities are so positioned that the casting cavity 13 and the additional cavities are separated by only a thin wall of the refractory mold material and the additional cavities sub- 2,893,084 Patented July 7, 1959 stantially encircle the whole surface of the casting cavities or the casting being produced.
  • the additional cavities contain a protective substance 15.
  • the cavities 14b and 14c are blanked olf by means of the plug 16 made of ceramic material. The plugs prevent the protective substance from falling out while the mold is reversed into the casting position shown in Fig. l.
  • the molten metal is poured through the ingate 17 to form the casting.
  • the method of my invention may be used, by way of example, in the destructible-pattern method of precision casting of high carbon steel as follows:
  • a destructible wax pattern is formed having two parts.
  • One part has the same external configuration of the finished casting to be cast and the other is in the shape of the desired additional cavity.
  • the two parts are associated together so the two cavities formed by them will be separated from one another in the finished mold and, preferably so positioned that when the casting cavity is filledwith molten metal the two cavities will beseparated by only a thin wall of refractory substance so that heat will be readily transmitted from the casting cavity to the additional cavity.
  • a rod-like projection may be placed upon thepattern segment forming the additional cavity so that a channel will be formed in the 'wall of the finished mold through which the protective substance may be placed in the additional cavity.
  • the channel is advantageously made as small as possible so the reducing gas generated therein will not escape to the outside air too readily but will instead enter the casting cavity to blanket the cooling casting.
  • the casting cavity of the mold is filled with molten metal.
  • a protective substance is introduced into the additional cavity, either before or after the molten metal is poured into the casting cavity.
  • the protective sub stance is introduced into the mold after the casting cavity is filled through the channel provided therefor, it should be done immediately thereafter so that the generation of reducing gases and the resulting blanketing of the molten metal begins early in the cooling process to avoid any unnecessary decarbonization. Any material which will produce carbon monoxide in incomplete combustion may be used as the protective substance.
  • Liquid material may be poured drop by drop into the additional space, while solids may be introduced either as a powder, pellet or piece of an appropriate size.
  • the castings made according to the described method show a complete absence of any decarbonization and a uniform carbon content throughout the entire finished casting.
  • a method of making castings from carbon containing metals which comprises forming a gas-permeable refractory casting mold having a casting cavity and at least one additional cavity, said additional cavity being so positioned that when the casting cavity is filled with the molten metal, the casting cavity will be separated from said adjacent cavity by a thin wall of gas-permeable refractory mold material, inserting into said additional cavity a protective substance which produces a reducing gas during the cooling of the casting in the mold to prevent.surfacedecarbonization of the casting, and filling the casting cavity with a molten metal containing carbon.
  • a method of making castings from carbon containing rmetal's which comprises iforming a gas-permeable refractorycasfing mold having -a casting cavity and an :additional :cavity, 'said additional cavity being. so positionedthat when .thecasting cavity is filled with the moltenrmetal, the castingcavity will be 'separatedfrom said adjacent cavity by athin wall f;gas,-permeable refractory mold material, filling the casting cavity I with a moltenxmetalcontaining carbomand inserting intosaid additional cavity a protective substance which; produces a. reducing-gas during the cooling of .the casting in the mold to preventsurface decarbonizationof thecasting before the molten metal solidifies.
  • a refractory casting mold for the production of castings ,from carbon containing metals comprising a gas-permeable refractory :casting mold having a casting cavity and an additional cavitybeing so positioned that when-the casting -cavity.is.filled with the .molten metal, the :castingcavity willbe separated from said adjacent cavity by a thin wall of gas-permeable refractory mold material.
  • the refractory casting mold of claim 13 which includes a passage-leading from the outside of the mold to the additional. cavitythrough which the protective substance can be introduced into the additional cavity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
US461884A 1953-10-16 1954-10-12 Casting mold and method of casting carbon-containing alloys Expired - Lifetime US2893084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2893084X 1953-10-16

Publications (1)

Publication Number Publication Date
US2893084A true US2893084A (en) 1959-07-07

Family

ID=4572589

Family Applications (1)

Application Number Title Priority Date Filing Date
US461884A Expired - Lifetime US2893084A (en) 1953-10-16 1954-10-12 Casting mold and method of casting carbon-containing alloys

Country Status (4)

Country Link
US (1) US2893084A (enExample)
CH (1) CH321965A (enExample)
DE (1) DE1002508B (enExample)
NL (2) NL182379B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126597A (en) * 1961-04-07 1964-03-31 Decarburization in casting of steel
US3153826A (en) * 1962-01-10 1964-10-27 Prec Metalsmiths Inc Precision casting molds and techniques
US3376914A (en) * 1963-11-04 1968-04-09 Foseco Int Production of metal ingots, slabs and billets
US3474851A (en) * 1966-01-17 1969-10-28 Monsanto Chemicals Processes for casting molten metal in active carbon coated ceramic shell moulds
US3590903A (en) * 1967-03-31 1971-07-06 Monsanto Chemicals Production of metal castings

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL126286C (enExample) * 1965-07-29

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674341A (en) * 1900-07-16 1901-05-14 Isaac Lehman Apparatus for casting ingots.
US1704384A (en) * 1926-01-14 1929-03-05 Dow Chemical Co Casting magnesium and alloy thereof
US1917759A (en) * 1932-03-03 1933-07-11 Dow Chemical Co Casting readily oxidizable metal
US2218781A (en) * 1940-02-27 1940-10-22 Hughes Tool Co Method of casting one metal upon another
US2335008A (en) * 1943-01-28 1943-11-23 Ohio Steel Foundry Co Means for casting metals

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674341A (en) * 1900-07-16 1901-05-14 Isaac Lehman Apparatus for casting ingots.
US1704384A (en) * 1926-01-14 1929-03-05 Dow Chemical Co Casting magnesium and alloy thereof
US1917759A (en) * 1932-03-03 1933-07-11 Dow Chemical Co Casting readily oxidizable metal
US2218781A (en) * 1940-02-27 1940-10-22 Hughes Tool Co Method of casting one metal upon another
US2335008A (en) * 1943-01-28 1943-11-23 Ohio Steel Foundry Co Means for casting metals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126597A (en) * 1961-04-07 1964-03-31 Decarburization in casting of steel
US3153826A (en) * 1962-01-10 1964-10-27 Prec Metalsmiths Inc Precision casting molds and techniques
US3376914A (en) * 1963-11-04 1968-04-09 Foseco Int Production of metal ingots, slabs and billets
US3474851A (en) * 1966-01-17 1969-10-28 Monsanto Chemicals Processes for casting molten metal in active carbon coated ceramic shell moulds
US3590903A (en) * 1967-03-31 1971-07-06 Monsanto Chemicals Production of metal castings

Also Published As

Publication number Publication date
DE1002508B (de) 1957-02-14
NL182379B (nl)
CH321965A (de) 1957-05-31
NL87448C (enExample)

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