EP2191912A1 - Method and mould for stratified moulding with metalostatic pressure compensation - Google Patents

Method and mould for stratified moulding with metalostatic pressure compensation Download PDF

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Publication number
EP2191912A1
EP2191912A1 EP07834482A EP07834482A EP2191912A1 EP 2191912 A1 EP2191912 A1 EP 2191912A1 EP 07834482 A EP07834482 A EP 07834482A EP 07834482 A EP07834482 A EP 07834482A EP 2191912 A1 EP2191912 A1 EP 2191912A1
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EP
European Patent Office
Prior art keywords
mould
cavity
moulding
stackable
stratified
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.)
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Application number
EP07834482A
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German (de)
English (en)
French (fr)
Inventor
Enrique Alvarado Murillo
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2191912A1 publication Critical patent/EP2191912A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks

Definitions

  • This invention relates to the casting of molten metal, and in particular relates to a method and mould for stratified moulding of multiple parts by stackable moulds that have a tapping cavity in a generally rhomboidal truncated cone shape that allows compensating the metalostatic pressure and achieve a temperature distribution in the mould during casting of the molten metal.
  • the normal mode for simultaneous casting in a plurality of stackable sand moulds and similar to fill a plurality of similar or identical parts is that the stackable moulds are placed on each other (in what is known as stratified moulding or moulding stacking), and arranged in such form that the core or central filling collector that interconnects the stackable moulds in a vertical way and, therefore, arranging the moulding cavities of each stackable mould on top of one another.
  • the moulding cavities of the lower stackable moulds are filled first and the upper cavities are filled later, but control is minimal as to the way in which the cast metal fills each moulding cavity.
  • the stackable moulds being arranged vertically, the molten metal when drained, induces a high static pressure (known as metalostatic pressure) on the lower stackable moulds, which often produces the effect of the molten metal passing through the metal of the stackable moulds (known as interior fusion), thus forming shrinkage during solidification of the molten metal and a complete crack in the mould wall, and finally this may produce leaks in the joints between adjacent moulds, causing the formation of burr or the complete break of a joint.
  • metalostatic pressure a high static pressure
  • interior fusion the effect of the molten metal passing through the metal of the stackable moulds
  • the object of this invention is to provide a mould for stratified moulding with metalostatic pressure compensation formed by one or more stackable moulds, consisting of a tapping cavity of a generally rhomboidal truncated cone shape and one or more moulding cavities connected to the tapping cavity by one or more supply conduits; in such a way that each tapping cavity of each stackable mould interconnects to form a central filling collector, and each tapping cavity compensates the metalostatic pressure of the molten metal as it is drained by the central filling collector to achieve generally uniform filling of each of the moulding cavities of each of the stackable moulds.
  • Another object of the invention is to provide a stackable mould that includes a tapping cavity of a generally rhomboidal double truncated cone shape and one or more moulding cavities connected to said tapping cavity by one or more supply conduits, so that the tapping allows for compensation of the metalostatic pressure of the molten metal as it is drained to achieve generally uniform filling of each of the moulding cavities.
  • each stackable mould includes a tapping cavity of a generally rhomboid shaped double truncated cone shape, and one or more moulding cavities connected to the tapping cavity by one or more supply conduits; where the stackable moulds are arranged in such way that their corresponding tapping cavities are arranged one on top of the other to form a central filling collector; and (b) pouring the molten metal in the central filling collector so that the molten metal flows through each tapping cavity and fills the moulding cavities from the lower stackable mould up to the upper stackable mould, where each tapping cavity allows metalostatic pressure compensation of the molten metal during its draining to achieve a generally uniform filling of each of the moulding cavities of each stackable mould.
  • mould for stratified moulding in the context of this description, means a mould formed by one or more stackable moulds arranged one on top of the other in a vertical column.
  • stackable mould in the context of this description, means each of the mould blocks forming the mould for stratified moulding, including the mould cavities, tapping cavities and supply conduits.
  • moulding in the context of this description, means the manufacturing process of parts based on pouring the molten metal into the moulding cavity of a mould, to obtain for the solidification and cooling of a part that is a reproduction of the moulding cavity.
  • moulding cavity in the context of this description, means a hollow space inside a mould which represents the shape of the part to be moulded.
  • tapping cavity in the context of this description, means hollow space inside a mould used to distribute and feed through the supply conduit the molten metal into the moulding cavity.
  • supply conduit in the context of this description, means the passage for the molten metal that connects the tapping cavity with a moulding cavity.
  • metalostatic pressure in the context of this description, means the static pressure exerted by the molten metal on the inner walls of the mould for stratified casting and its stackable moulds.
  • the mould for stratified moulding 10 is formed by one or more stackable moulds 20 which in turn each one is formed by a casting cavity 30 and one or more moulding cavities 40 connected one to another by one or more supply conduits 50.
  • Each stackable mould 20 can be a sand mould, a permanent mould, or a ceramic mould.
  • each stackable mould 20 is formed from the assembly of an upper mould part 60 with a lower mould part 70 by a mechanism generally of the male-female-type.
  • Each of the tapping cavities 30 have a generally rhomboidal double truncated cone shape and are vertically interconnected to form a central filling collector 80, through which a flow of molten metal passes, as it is poured into the mould for stratified moulding 10, the tapping cavities 30 of the stackable moulds 20 are successively filled, starting with the lower ones and then up to the upper ones. As the molten metal fills each tapping cavity 30, the moulding cavities 40 connected to them are filled.
  • each of the tapping cavities 30 allows metalostatic pressure compensating of molten metal during its casting by the central filling collector 80, so that a generally uniform filling is accomplished by each of the moulding cavities 40 of each of the stackable moulds 20.
  • the rhomboidal form of the double truncated cone shape of each of the tapping cavities 30 is formed by an upper cavity 110 in the upper mould part 60 in the form of a truncated cone with a smaller base and a larger base, and a lower mould part 70 also in the form of a truncated cone with a smaller base and a larger base; in such way that when assemblying the upper mould part 60 with the lower mould part 70, to make a stackable mould 20, the upper cavity 110 and the lower cavity 120 remain opposite to each other and interconnected by their respective larger base.
  • the upper cavity 110 or lower cavity 120 may have a bell-shaped form of a truncated pyramid shape, a spherical segment of two bases, or the combinations thereof.
  • each tapping cavity 30 the smaller base of the upper cavity 110 is smaller than the smaller base of the lower cavity 120, while the larger base of the upper cavity 110 is smaller than the larger base of said lower cavity 120.
  • This arrangement allows forming a central filling collector 80 that varies (from top to bottom) in a stepped form in its diameter. This irregularly shaped central filling collector 80 allows the formation of hot spots in the junction points of the casting cavities 30, when pouring the molten metal and therefore achieves a temperature distribution in the mould for stratified moulding 10.
  • the mould for stratified moulding 10 includes a pouring cup 90 through which molten metal is poured and which is located in the upper part of mould 10 and connected to the central filling collector 80 by its upper part.
  • the draining cup 90 is defined by a mould cavity with a bell-shaped form, a truncated pyramid shape, a spherical segment of two bases, or the combinations thereof.
  • the mould for stratified moulding 10 includes a flow stabilizer 100 located at the bottom of the mould 10 and connected to the central filling collector 80 at its bottom part.
  • the flow stabilizer 100 is defined by a mould cavity with a bell-shaped form, a truncated pyramid shape, a spherical segment of a base, a spherical segment with two bases, and the combinations thereof.
  • the shape of the pouring cup 90 and the flow stabilizer 100 allows no bubbles to be formed when pouring the molten metal, because it counteracts or dampens the turbulence of the flow.
  • a method for stratified moulding with metalostatic pressure compensation starts by forming a mould for stratified moulding 10 starting from a plurality of stackable moulds 20 (as described above) arranged one on top of the other in a vertical column.
  • a pouring cup 90 is located at the upper part of the mould for stratified moulding 10 and at the bottom a flow stabilizer 100, both connected to the central filling collector 80; and then draining the molten metal in the central filling collector 80 so that the molten metal flows through the tapping cavity 30 and fills the moulding cavities 40 from the lower stackable mould 20 up to the upper stackable mould 20; so that each tapping cavity 30 allows compensating the metalostatic pressure of the molten metal when it is drained to achieve a generally uniform filling of each of the moulding cavities 40 of each stackable mould 20.
  • each tapping cavity allows the formation of hot spots during the draining of the molten metal by the central filling collector 80 to achieve a distribution of the temperature along the mould for stratified moulding 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
EP07834482A 2007-07-25 2007-08-29 Method and mould for stratified moulding with metalostatic pressure compensation Withdrawn EP2191912A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MX2007008956A MX2007008956A (es) 2007-07-25 2007-07-25 Metodo y molde para moldeo estratificado con compensacion de presion metalostatica.
PCT/MX2007/000101 WO2009014412A1 (es) 2007-07-25 2007-08-29 Método y molde para moldeo estratificado con compensación de presión metalostática

Publications (1)

Publication Number Publication Date
EP2191912A1 true EP2191912A1 (en) 2010-06-02

Family

ID=40278725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07834482A Withdrawn EP2191912A1 (en) 2007-07-25 2007-08-29 Method and mould for stratified moulding with metalostatic pressure compensation

Country Status (5)

Country Link
US (1) US20100193151A1 (es)
EP (1) EP2191912A1 (es)
BR (1) BRPI0721865A2 (es)
MX (1) MX2007008956A (es)
WO (1) WO2009014412A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114012041B (zh) * 2021-10-11 2024-05-14 甘肃酒钢集团西部重工股份有限公司 一种3dp砂型技术生产小型叶轮的铸造装置及铸造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB895426A (en) * 1959-06-17 1962-05-02 Shell Moulding Foundry Ltd Improvements in and relating to shell moulds and cores
US3628598A (en) * 1968-10-23 1971-12-21 Modern Equipment Co Casting molds
DE2358489A1 (de) * 1972-12-27 1974-07-04 Erwin Buehrer Verfahren zur herstellung von giessformen und vorrichtung zu dessen durchfuehrung
US4241492A (en) * 1978-12-21 1980-12-30 Wells Manufacturing Company Process for manufacture of valve seat
JPS5930461A (ja) * 1982-08-11 1984-02-18 Masami Michihiro 金型を使用したスタツク鋳造法
ES296248Y (es) * 1984-11-13 1988-04-16 Galve Quiles Jose Nuevo procedimiento de fundicion de metales
CS250253B1 (cs) * 1984-12-27 1987-04-16 Karel Novak Forma pro výrobu drobných odlitků
ES2046078B1 (es) 1991-07-08 1995-10-01 Metalogenia Sa Perfeccionamientos en la fabricacion de piezas moldeadas de acero, dotadas de cavidades interiores.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009014412A1 *

Also Published As

Publication number Publication date
US20100193151A1 (en) 2010-08-05
MX2007008956A (es) 2007-09-07
BRPI0721865A2 (pt) 2014-02-18
WO2009014412A1 (es) 2009-01-29

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