EP4205877A1 - Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt - Google Patents

Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt Download PDF

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Publication number
EP4205877A1
EP4205877A1 EP21383233.0A EP21383233A EP4205877A1 EP 4205877 A1 EP4205877 A1 EP 4205877A1 EP 21383233 A EP21383233 A EP 21383233A EP 4205877 A1 EP4205877 A1 EP 4205877A1
Authority
EP
European Patent Office
Prior art keywords
extraction system
sand mold
gas
gas extraction
lower sand
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.)
Pending
Application number
EP21383233.0A
Other languages
English (en)
French (fr)
Inventor
Fernando Santos Barrena
David García Hernández
Hegoi Andonegi Lobato
Andrea Niklas
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.)
Fundacion Azterlan
Original Assignee
Fundacion Azterlan
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 Fundacion Azterlan filed Critical Fundacion Azterlan
Priority to EP21383233.0A priority Critical patent/EP4205877A1/de
Publication of EP4205877A1 publication Critical patent/EP4205877A1/de
Pending 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
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D45/00—Equipment for casting, not otherwise provided for
    • B22D45/005—Evacuation of fumes, dust or waste gases during manipulations in the foundry

Definitions

  • the present invention is encompassed within the sector of metallurgical industry, particularly in the field of casting steel articles by a sandcasting process using sand molds inside a metallic molding box comprising two halves i.e. copes and bottom halves i.e. drags.
  • Conventional casting devices comprise a metallic molding box, an upper sand mold and a lower sand mold.
  • the upper and the lower sand molds are arranged within the molding box (divided in two halves to conform each one the upper and lower sand mold)) such that a bottom surface of the upper sand mold is in contact with a top surface of the lower sand mold.
  • the sand molds are made of sand and at least one binder and comprise a molding cavity to be filled with molten metal, and a table, fix o sliding in a carrousel, having a top plate comprising a top surface for supporting the molding box.
  • the sand molds are made by mixing up a resin with silica sand and a catalytic product that hardness the mixture after a certain period of time.
  • the sand molds made of sand and at least one binder such as furanic resin, phenolic resin or sodium silicate.
  • the sand molds can also comprise different sand cores that are used to generate internal geometries of the article to be casted. A minimum of voids between sand grains but allowing at the same time the flow of air or gases in the sand molds, is desirable.
  • the hot molten metal When the hot molten metal is filled into the mold cavity, it contacts the sand molds and thus the binder or binders by which the sand of the sand molds is agglomerated.
  • the gas resulting from the degradation of the binder(s) tends to flow upwards.
  • Gas generated in the lower sand mold thus tends to flow around and through the molten metal causing interactions with the metal and the presence of inclusions therein.
  • molten metal gets in touch with the bottom portion of the molding cavity as the metal fills up the empty shape or the pattern.
  • the metal heats up the moulds and decomposes the organic or inorganic binders generating a significant quantity of gases resulting from the partial or total evaporation of the binder or by its chemical reaction with air remaining in pores between sand grains in the mould.
  • the result of this evaporation and chemical reaction are different gases that go through the molten metal or mix up with it, getting stuck on it when it solidifies as gas bubbles when no reaction has taken place, or as non-metallic inclusions when they have reacted with chemical elements of the molten metal.
  • Wrought steel articles are manufactured by controlled continuous casting processes. There are standards such as ASTM E45-13 and DIN EN 10247 that are used to determine the cleanliness level in terms the presence of inclusions in the steel for the case of wrought steel articles. It is well known that the level of inclusions is very critical for a significant number of properties of the steel. For example, the elongation and fatigue are clearly influenced by the amount and type of inclusions, whereby a significant worsening of these properties is observed when inclusions are present in significant values.
  • a first aspect of the invention relates to a gas extraction system for extracting gas generated when casting metal articles by a sand moulding process, that is intended to solve or at least mitigate the problem caused by gas generated in a sand mold when the lower half of the mold cavity comes into contact with the hot molten metal.
  • the gas extraction system comprises
  • the bottom vents extend to the whole surface of the metal article to cast.
  • the bottom vents can extend also to the feeding inlet and to the core prints.
  • the outlet opening is preferably located in a center position of the top plate of the table.
  • the casting device for casting metal articles by a sand casting process comprises a molding box (divided in two halves to conform each one the upper and lower sand mold), and upper sand mold and a lower sand mold, the upper and the lower sand molds arranged within the molding box such that a bottom surface of the upper sand mold is in contact with a top surface of the lower sand mold, the lower sand mold comprising a bottom surface, the sand molds forming a molding cavity to be filled with molten metal, a table having a top plate comprising a top surface with a peripheral fringe area for supporting the molding box, and a gas extraction system as disclosed in this specification.
  • the vacuum pump -13- draws hot gas out of the molding box -1- through the manifold -12a-, the hose -12b-, a cooling coil -15a- of the cooling device -15- to cool the gas, and the filter device -16- to filter the cooled gas, and expels the cooled and filtered gas though an exhaust pipe -12c-.
  • the insert -14- with the outlet opening -10- is located in a center position of the top plate -7- of the table -6-.
  • a sealing joint -8- is positioned between a peripheral fringe area -7b- (see figure 4 ) of the top plate -7- of the table -6- and the bottom edge -3a- of the molding box -1-,
  • the metal frame -11- and the top plate -7- of the table -6- are connected together by means of bolt-and-nut connections -18-, so that the metal frame -11- holds the molding box -1- on the top plate -7- of the table -6- and presses the bottom edge -3a- of the molding box -1- against the sealing joint -8- on the peripheral fringe area -7b-.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP21383233.0A 2021-12-29 2021-12-29 Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt Pending EP4205877A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21383233.0A EP4205877A1 (de) 2021-12-29 2021-12-29 Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21383233.0A EP4205877A1 (de) 2021-12-29 2021-12-29 Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt

Publications (1)

Publication Number Publication Date
EP4205877A1 true EP4205877A1 (de) 2023-07-05

Family

ID=79185761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21383233.0A Pending EP4205877A1 (de) 2021-12-29 2021-12-29 Bodengasextraktionssystem zur herstellung von stahlgusskomponenten mit reduziertem einschlussgehalt

Country Status (1)

Country Link
EP (1) EP4205877A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674553A (en) * 1986-07-07 1987-06-23 Witt Raymond H Method for sand casting varying thickness articles
US4742863A (en) * 1986-07-07 1988-05-10 Witt Raymond H Mold for sand casting varying thickness articles
WO1989009666A1 (en) * 1988-04-14 1989-10-19 Rikker Leslie D Method and apparatus for evaporative pattern casting
EP3320999A1 (de) * 2016-11-15 2018-05-16 Georg Fischer GmbH Fertigungsverfahren mit einer vakuum-sandgussform

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674553A (en) * 1986-07-07 1987-06-23 Witt Raymond H Method for sand casting varying thickness articles
US4742863A (en) * 1986-07-07 1988-05-10 Witt Raymond H Mold for sand casting varying thickness articles
WO1989009666A1 (en) * 1988-04-14 1989-10-19 Rikker Leslie D Method and apparatus for evaporative pattern casting
EP3320999A1 (de) * 2016-11-15 2018-05-16 Georg Fischer GmbH Fertigungsverfahren mit einer vakuum-sandgussform

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