US3700025A - Method of casting quiet melts - Google Patents

Method of casting quiet melts Download PDF

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Publication number
US3700025A
US3700025A US176025A US3700025DA US3700025A US 3700025 A US3700025 A US 3700025A US 176025 A US176025 A US 176025A US 3700025D A US3700025D A US 3700025DA US 3700025 A US3700025 A US 3700025A
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US
United States
Prior art keywords
melt
mold
chamber
equalization chamber
casting
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
US176025A
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English (en)
Inventor
Oscar Tenner
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.)
GRAVICAST PATENT GmbH
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GRAVICAST PATENT GmbH
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Filing date
Publication date
Application filed by GRAVICAST PATENT GmbH filed Critical GRAVICAST PATENT GmbH
Application granted granted Critical
Publication of US3700025A publication Critical patent/US3700025A/en
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations

Definitions

  • the invention refers to a method of casting melts in which the melt is dammed up to a certain level in a supply container which causes a movement of the melt by its own weight through an equalization container and into a casting mold connected with said equalization container.
  • a disadvantage of the two first-mentioned methods is that the flow pattern of the melt which is guided into the mold cannot be controlled. All of the mentioned methods have-the disadvantage that the control interval during which the pressure of the melt in the mold can be changed, is dependent on the ferr'ostatic level of the melt in the supply container and is for that reason relatively limited. No regulation is possible during the static state which occurs after filling of the mold, for in a static pressure system there is everywhere the same pressure depending on the ferrostatic level. When producing small castings, if it is questionable when the apparatus is not very small whether the operation takes place in the dynamic or in the static state, this leads to uncontrolled conditions'not conducive to an orderly production.
  • the flow of the melt, before it fills the mold completely is interrupted by stopping the flow of the melt into the equalization chamber, so that the melt enters the mold in a quiet state, and after filling the mold any return flow of the melt from the equalization chamber is stopped and then an increased pressure, which is higher than the pressure on the melt during the filling of the mold, is exerted on the melt in the equalization chamber and in the mold.
  • the pressure application according to the invention permits theoretically the production of any desired high pressure at low expense, because the equalization chamber for the purpose of fulfilling its function may be relatively small.
  • This function consists in stabilizing the melt after it has passed the shutoff device (separating the supply chamber from the equalization chamber), which stops the flow of the melt in the equalization chamber.
  • a small pressure chamber requires less force than a larger one.
  • the filling of the mold occurs automatically by ferrostatic pressure and therefore there are hydrostatic conditions at the moment when the elevated pressure is produced. That is why this production of pressure is much easier and the increased pressure may be produced more quickly and released as if the flow of the melt is produced by artificial pressure. This leads to shorter cycle intervals and therefore to an increased production, as compared with known methods.
  • the entire arrangement will be smaller in size and thus will be less expensive than the existing arrangements.
  • the method of the present invention also makes it possible to produce a homogeneous structure throughout the wall of the castings, thus considerably eliminating waste during the further processing methods.
  • a further feature of the invention is that the melt in the equalization chamber is conducted during the filling of the mold over a straight portion with equal cross section until the melt is substantially free of turbulence. In this manner, much better casting conditions are created and waste is still more reduced because this flow of the melt settles the turbulence which originates from passing the shutoff device which controls the flow of the melt into the equalization chamber. According to the invention, it is advisable to maintain the elevated pressure on the melt until the melt in the gate cross section of the mold has become solid, because this leads to a better structure of the casting.
  • the elevated pressure in the equalization chamber can be very easily produced by a mechanical pressure increase of the melt in the equalization chamber, for instance by means of a displacement body which is immersed in the melt.
  • the displacement body acts on the hydrostatic system and therefore only very small movements of this displacement body are necessary to produce a maximum of pressure.
  • FIGURE of the drawing shows schematically an example in a vertical sectional view of an apparatus which may be used to practice the method in accordance with the invention.
  • the apparatus for practicing the method of the invention comprises a horizontally disposed lower part 1 and a horizontally disposed upper part 2. Both these parts are screwed together by means of marginal flanges 3.
  • a horizontally arranged tube arranged within the cavity formed by the parts 1 and 2 forms an equalization chamber 5.
  • the ends of the tube are closed by plugs 6 and 7 and are arranged in circular recesses 4 formed in the inner end walls of the lower part 1 and the upper part 2, respectively.
  • the equalization chamber has a straight horizontal axis and has at least a constant cross section in the area between its lateral inlet 8, which can be closed by a plug 9 which controls the flow of the melt into the chamber 5, and its outlet 10 which has a casting nozzle 11 mounted therein which leads to a mold or a die 12.
  • This cross section of the chamber 5 may have any desired form and depends on fluid mechanics and on construction requirements.
  • the exterior cross section or circumference of the tube forming the equalization chamber 5 can be selected in dependently of the inner cross section of the equalization chamber 5.
  • a hollow cylindrical member 13 is mounted in the wall of the equalization chamber 5.
  • a piston 14 which constitutes a displacement body.
  • the space surrounding the chamber 5 in the inner chamber of the lower part 1 and of the upper part 2 constitutes a supply chamber 15 which together with an upper extension is filled with melt up to a level 16.
  • the supply chamber 15 is connected with a conduit 17 to a melting furnace, not shown. This may be done, for instance, by means of communicating vessels.
  • openings 18 in the lower portion of the supply chamber serve as a connection with an induction heating device (not shown) which maintains the melt at the desired temperature.
  • a horizontal nozzle may also be used for casting, it is inserted in place of the plug 7 in the end wall of the tube forming the equalization chamber 5.
  • the described apparatus operates as follows: The supply chamber 15 and the equalization chamber 5, and if possible also the casting nozzle 11 are filled with quiet melt, for the plug 9 is closed and the piston 14 stands still. After positioning the mold 12, the plug 9 is raised and the inlet 8 is opened to such an extent as to obtain the required casting speed for the casting to be produced. By this means it is possible to produce different castings without changing the apparatus.
  • the plug 9 is lowered and closes the inlet 8.
  • piston 14 and the plug 9 can be controlledin a mechanical, hydraulic, electrical or electronic manner.
  • inlet 8 and outlet 10 and also the inner cross section of equalization chamber 5 are selected in such a manner that a quiet flow of the melt in the equalization chamber and in the mold 12 is produced, and the melt enters the mold practically without turbulence through the outlet 10 and the nozzle 11, respectively; thus perfect castings are the result.
  • This method can be used for any kinds of metals; i.e., metal melts, such as iron, steel, brass, bronze, etc., or for plastic melts.
  • Method of casting melts in which the melt is dammed up to such a level in a supply chamber that the melt flows by its own weight through an equalization chamber connected to said supply chamber and fills a casting mold connected with said equalization chamber, wherein the improvement comprises the steps of bringing the melt to a quiet condition before the melt reaches the mold by interrupting the flow of the melt into the equalization chamber, then introducing the quiet melt into the mold and after filling the mold preventing a return flow of the melt from the equalization chamber to the supply chamber, then subjecting the melt in the equalization chamber and in the mold to an increased pressure which is higher than the ferrostatic pressure acting on the melt during the filling 3.
  • Method according to claim 1 including the step of operation of the mold. maintaining said increased pressure on the melt until 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US176025A 1970-09-04 1971-08-30 Method of casting quiet melts Expired - Lifetime US3700025A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT804770A AT311574B (de) 1970-09-04 1970-09-04 Verfahren zum Gießen von Schmelzen

Publications (1)

Publication Number Publication Date
US3700025A true US3700025A (en) 1972-10-24

Family

ID=3601997

Family Applications (1)

Application Number Title Priority Date Filing Date
US176025A Expired - Lifetime US3700025A (en) 1970-09-04 1971-08-30 Method of casting quiet melts

Country Status (9)

Country Link
US (1) US3700025A (enrdf_load_stackoverflow)
JP (1) JPS5221454B1 (enrdf_load_stackoverflow)
AT (1) AT311574B (enrdf_load_stackoverflow)
CH (1) CH521808A (enrdf_load_stackoverflow)
DE (1) DE2144025C3 (enrdf_load_stackoverflow)
FR (1) FR2105268B1 (enrdf_load_stackoverflow)
GB (1) GB1356330A (enrdf_load_stackoverflow)
IT (1) IT945938B (enrdf_load_stackoverflow)
NL (1) NL7112094A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777801A (en) * 1970-08-28 1973-12-11 Gravicast Patent Gmbh Casting apparatus
US3814170A (en) * 1971-06-08 1974-06-04 F Kahn Apparatus for melting and casting material under pressure
US3865177A (en) * 1972-06-07 1975-02-11 Graenges Eng Ab Method of bottom-casting ingots
US3940264A (en) * 1972-06-05 1976-02-24 Granges Essem Aktiebolag Method of distributing molten metal to consumer stations
US5454423A (en) * 1993-06-30 1995-10-03 Kubota Corporation Melt pumping apparatus and casting apparatus
CN108941522A (zh) * 2018-07-09 2018-12-07 杨福荣 一种五金制作用紧固件成型装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153440B1 (de) * 1984-02-23 1988-05-11 Gerhard Bleickert Warmhalte- und/oder Abschmelzofen für NE-Metalle mit Dosiereinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE290855C (enrdf_load_stackoverflow) *
US83222A (en) * 1868-10-20 John blake tarr

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1312338A (fr) * 1962-01-25 1962-12-14 Procédé et dispositif pour le moulage des métaux sous pression
DE1295762B (de) * 1965-08-24 1969-05-22 Kraft Gmbh Industrieofenbau Giessvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE290855C (enrdf_load_stackoverflow) *
US83222A (en) * 1868-10-20 John blake tarr

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777801A (en) * 1970-08-28 1973-12-11 Gravicast Patent Gmbh Casting apparatus
US3814170A (en) * 1971-06-08 1974-06-04 F Kahn Apparatus for melting and casting material under pressure
US3940264A (en) * 1972-06-05 1976-02-24 Granges Essem Aktiebolag Method of distributing molten metal to consumer stations
US3865177A (en) * 1972-06-07 1975-02-11 Graenges Eng Ab Method of bottom-casting ingots
US5454423A (en) * 1993-06-30 1995-10-03 Kubota Corporation Melt pumping apparatus and casting apparatus
CN108941522A (zh) * 2018-07-09 2018-12-07 杨福荣 一种五金制作用紧固件成型装置

Also Published As

Publication number Publication date
GB1356330A (en) 1974-06-12
DE2144025A1 (de) 1972-03-09
FR2105268A1 (enrdf_load_stackoverflow) 1972-04-28
JPS5221454B1 (enrdf_load_stackoverflow) 1977-06-10
AT311574B (de) 1973-11-26
DE2144025B2 (de) 1974-01-24
DE2144025C3 (de) 1974-08-22
IT945938B (it) 1973-05-10
CH521808A (de) 1972-04-30
FR2105268B1 (enrdf_load_stackoverflow) 1974-05-31
NL7112094A (enrdf_load_stackoverflow) 1972-03-07

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