EP3059029B1 - Procédé de versement ascendant de pression négative - Google Patents

Procédé de versement ascendant de pression négative Download PDF

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Publication number
EP3059029B1
EP3059029B1 EP15155388.0A EP15155388A EP3059029B1 EP 3059029 B1 EP3059029 B1 EP 3059029B1 EP 15155388 A EP15155388 A EP 15155388A EP 3059029 B1 EP3059029 B1 EP 3059029B1
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EP
European Patent Office
Prior art keywords
mold
molten steel
melting furnace
flow path
path system
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.)
Active
Application number
EP15155388.0A
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German (de)
English (en)
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EP3059029A1 (fr
Inventor
Yu-San CHEN
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.)
Mei Ta Industrial Co Ltd
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Mei Ta Industrial Co Ltd
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 Mei Ta Industrial Co Ltd filed Critical Mei Ta Industrial Co Ltd
Priority to RS20181003A priority Critical patent/RS57721B1/sr
Priority to PL15155388T priority patent/PL3059029T3/pl
Priority to EP15155388.0A priority patent/EP3059029B1/fr
Priority to TR2018/12291T priority patent/TR201812291T4/tr
Priority to HUE15155388A priority patent/HUE039983T2/hu
Publication of EP3059029A1 publication Critical patent/EP3059029A1/fr
Application granted granted Critical
Publication of EP3059029B1 publication Critical patent/EP3059029B1/fr
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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
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
    • 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

Definitions

  • the present invention relates to a pouring method and more particularly to a negative pressure updraught pouring method used for draughting molten steel upwards into a mold to form a cast by negative pressure according to claim 1. Further advantageous configurations of the invention can be drawn from the dependent claim.
  • the Gravity pouring method employed by conventional iron and steel foundry plants mainly comprises steps of: after steel is fused to 1450 - 1700°C by a melting furnace, the high temperature molten steel is filled in an iron bucket (d) and thenthe molten steel is poured and casted into a pre-manufactured mold (a); the molten steel is poured into a mold cavity c through a pouring basin (b1), a vertical sprue (b2), a runner (b3) and a gate (b4) of a flow path system (b) by gravitational effect; and the cooled and solidified molten steel is taken out from the mold (a). The solidified molten steel is cleaned and processed properly for obtaining a cast required.
  • the above pouring method is mainly used in iron and steel foundry. Nevertheless, the pouring method has the following drawbacks based on the foundry costs and quality of casts:
  • the molten steel is required for passing through the flow path system when it is casted into the sand mold by gravitational effect. Flowing speed of the molten steel is not too fast due to the obstruction of the air in the mold cavity. The thinner is the thickness of the cast; the slower is the flowing speed. The longer is the flowing path; the faster is the quenching speed of the molten steel. Therefore, the thin thickness of the cast is hard to form if the temperature of the molten steel is not high and the flowability is poor. As a result, it is difficult to obtain casts with good quality.
  • the melting temperature reaches 1700°C or higher, even though the flowability of the molten steel can be increased for forming casts with a thin thickness, but not only that the electricity consumption is increased, the lifespan of refractory materials of the melting furnace is shortened substantially after the melting temperature is increased.
  • the frequency for changing the refractory materials has to increase which will increase the costs for changing the refractory materials and reduce the production capacity due to the downtime for changing.
  • the melting temperature of the molten steel is over 1700°C, the refractory materials of the melting furnace will be fused with the molten steel. As a result, the amount of oxide-containing impurities in the molten steel increases which will affect the purity and mechanical property of the steel casts.
  • the molten steel is required to fill up the flow path system including the pouring basin, the vertical sprue and the runner for flowing into the mold cavity.
  • the molten steel inside the flow path system and that inside the mold cavity will be cooled down and solidified at the same time.
  • the molten steel retaining inside the flow path system will increase the consumption of molten steel.
  • the ratio (i.e. yield) of the amount of casts and that of the total pouring molten steel cannot be enhanced effectively.
  • the ineffectiveness of enhancing the yield means the amount of molten steel cannot be saved effectively, the energy source cannot be saved effectively and thus the production costs cannot be reduced effectively.
  • DE 39 25 373 A1 discloses a method wherein molten metal is drawn upwards through one or more inlets into a mold. A vacuum is applied so that the molten metal fills the mold and rises into at least one riser pipe. The metal in the inlets to the mold is caused to harden as soon as a required level in the riser has been reached, so that the molten metal is enclosed in the mold. The mold is then pressurised. The molten metal is enclosed in the mold before it can harden, so that the application of an external pressure can be used to ensure that all of the mold is completely filled.
  • Document EP 0 580 136 A1 relates to a suction casting apparatus, which comprises a ventilating casting die, a chamber box and a surface peat for supporting the casting die and chamber box.
  • the surface plate has a through hole for passing a stalk therethrough, and its surface is formed with grooves which extend from the through hole to an area outside a die mounting area and inside a chamber box mounting area. External air entering through a sealed clearance between the surface plate and the stalk and combustion gas generated from the casting die are quickly led through the grooves into the chamber inner space to be quickly exhausted to the outside.
  • US 1,473,246 A1 discloses an apparatus for filling molds under reduced pressure including a work table on which the mold is adapted to rest, a bell having its lower edge resting on said table and adapted to enclose the mold.
  • a diaphragm covers an opening of the bell and is adapted to bear on the mold for forcing the mold toward the work table. Air can be withdrawn from the bell in order to cause the diaphragm to bear on the mold.
  • Document EP 0 967 035 A1 discloses a suction casting method for pouring molten metal from a pouring gate of a die into a cavity using negative pressure, wherein higher negative pressure than negative pressure of an interior of the cavity is applied to a low temperature surface portion of the die.
  • US 4,550, 763 A discloses a pressure die casting method and apparatus wherein the delivery tube from the melt reservoir contained in the pressurizable housing can receive the melt on the tube affixed to the mold which also is in a pressurizable housing and when the latter tube is retracted from the former, a sliding shutter closes the top of the reservoir tube. Gas communication between the upper end of the reservoir tube and the interior of the housing is permitted to ensure that a gas layer corresponding to that in the housing will overlie the melt in the reservoir portion of the tube.
  • FR 571 370 A discloses a process and molding device applicable to metals or plastics materials provided in liquid or paste form, in which the mold filling is done under the action of vacuum molds to fill not necessarily being sealed by themselves but under a tight chamber wherein the vacuum is produced at the time of casting.
  • a negative pressure updraught pouring method of the present invention is provided for improving the afore-mentioned drawbacks of the conventional structures and achieving the following objectives.
  • a primary objective of the present invention is to provide a negative pressure updraught pouring method for solving the problem of difficulty in forming casts with a thin thickness when the molten steel temperature is not high and meeting the requirements of casts with a thin thickness.
  • Another objective of the present invention is to provide a negative pressure updraught pouring method for solving the drawback of the high molten steel temperature in order that the power consumption can be reduced, the loss and changing frequency of refractory materials can be reduced, the purity and mechanical property of casts can be enhanced and thus the production costs can be reduced.
  • Another objective of the present invention is to provide a negative pressure updraught pouring method for solving the drawback of redundant molten steel remaining inside the flow path system which causes the ineffectiveness of enhancing the yield ratio in order that the costs for reclaiming the molten steel can be saved and the output can be increased effectively.
  • Another objective of the present invention is to provide a negative pressure updraught pouring method for solving the drawback of the requirement of using the iron bucket for pouring.
  • the iron bucket and related equipment are no longer needed and thus the production costs can be reduced.
  • the negative pressure updraught pouring method of the present invention for forming at least one cast by using at least one mold.
  • a mold cavity and a flow path system connected with each other are disposed inside the mold.
  • the negative pressure updraught pouring method comprises following steps of: a) a flat plate with a suction pipe is covered on a top end of a melting furnace, the melting furnace is filled with fused molten steel, and a bottom end of the suction pipe is dipped into the molten steel; b) an air passage connected with the mold cavity is formed on the mold, and the mold is placed on the flat plate in order that the flow path system of the mold is connected with a top end of the suction pipe; c) a chamber is covered on the mold and the flat plate, and the air inside the chamber is drawn out to reduce the air pressure inside the chamber and the mold cavity, the molten steel inside the melting furnace is sucked upwardly and flowed into the mold cavity through the suction pipe; and
  • the negative pressure updraught pouring method further comprises a step of: after the step d, the chamber is removed and the mold is detached from the flat plate.
  • the mold is a sand mold
  • the air passage on the mold is a gap between each one of sand grains of the sand mold
  • the temperature of the fused molten steel inside the melting furnace is between 1400 - 1550°C.
  • a preferred embodiment of a negative pressure updraught pouring method of the present invention comprises following steps of:
  • the melting furnace 2 in the step is a coil heating type melting furnace.
  • the melting temperature of the molten steel 9 is controlled between 1400 - 1550°C.
  • the suction pipe 4 is penetrated through the flat plate 3 vertically and an opening of the bottom end of the suction pipe 4 is dipped into the molten steel 9.
  • An opening of the top end of the suction pipe 4 and a top surface of the flat plate 3 are roughly on a same plane.
  • the mold 5 in the step b is a sand mold.
  • the air passage 52 on the mold 5 is a gap between each one of sand grains of the sand mold for creating air permeable effect.
  • An intake 531 of the flow path system 53 of the mold 5 is formed on a bottom surface of the mold 5 in order that the intake 531 can be aligned with the opening of the top end of the suction pipe 4 when the mold 5 is placed on the flat plate 3, and thus the flow path system 53 of the mold 5 can be connected with the top end of the suction pipe 4.
  • the chamber 6 is a hollow container with a bottom opening.
  • a top end of the chamber 6 is connected with an air exhaust tube 61 in order that a vacuum pump is used for extracting air inside the chamber 6 when the chamber 6 is covered on the mold 5 and the flat plate 3.
  • the air pressure inside the chamber 6 is the same as that of the mold cavity 51, the flow path system 53 and the suction pipe 4. Therefore, negative pressure can be used for sucking the molten steel 9 inside the melting furnace 2.
  • the molten steel 9 can flow upward through the suction pipe 4 and then into the mold cavity 51 through the flow path system 53.
  • a plurality of the mold cavity 51 can be disposed for forming a plurality of casts at the same time.
  • the molten steel 9 is allowed to stand for a period of time. Then, before the molten steel 9 inside the mold cavity 51 is completely solidified, and the molten steel 9 within the gate 54 between the flow path system 53 and the mold cavity 51 is solidified, the negative air pressure inside the chamber 6 is relieved so that the unsolidified molten steel 9 inside the flow path system 53 can flow back downwardly into the melting furnace 2.
  • the negative pressure updraught pouring method of the present invention has the following advantages:
  • the expected objectives can be achieved by the negative pressure updraught pouring method of the present invention which not only can allow casts to have a thin thickness, the production costs can be reduced, output can be enhanced, manufacturing process can be simplified, and quality of casts can be ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (2)

  1. Procédé de versement en courant ascendant à pression négative prévu pour au moins un moule (5) pour former au moins une coulée, où l'au moins un moule (5) a une cavité de moule (51), un système de chemin d'écoulement (53) et un passage d'air (52), la cavité de moule (51) et le système de chemin d'écoulement (53) étant raccordés l'un à l'autre à l'intérieur du moule (5), tandis que le passage d'air (52) est raccordé à la cavité de moule (51), et le moule (5) est un moule en sable et son passage d'air (52) sur le moule est un écartement entre des grains de sable du moule en sable ; le procédé comprenant les étapes suivantes de :
    a. recouvrement d'une plaque plate (3) avec un tuyau d'aspiration (4) sur une extrémité haute d'un four de fusion (2), remplissage du four de fusion (2) avec de l'acier fondu (9), et immersion d'une extrémité basse du tuyau d'aspiration (4) dans l'acier fondu (9) ;
    b. placement du moule (5) sur la plaque plate (3) afin de raccorder le système de chemin d'écoulement (53) du moule (5) à une extrémité haute du tuyau d'aspiration (4) ;
    c. placement d'une chambre (6) sur le moule (5) et la plaque plate (3), attraction de l'air à l'intérieur de la chambre (6) pour réduire la pression d'air à l'intérieur de la chambre (6) et de la cavité de moule (51), de façon à aspirer l'acier fondu (9) à l'intérieur du four de fusion (2) vers le haut par le biais du tuyau d'aspiration (4) afin de faire s'écouler l'acier fondu (9) dans la cavité de moule (51) ;
    d. relâchement de la pression d'air négative à l'intérieur de la chambre (6) lorsque l'acier fondu (9) au sein d'une grille (54) entre le système de chemin d'écoulement (53) et la cavité de moule (51) est solidifié et avant que l'acier fondu (9) à l'intérieur de la cavité de moule (51) soit totalement solidifié, de façon à faire s'écouler l'acier fondu (9) à l'intérieur du système de chemin d'écoulement (53) de retour dans le four de fusion (2), et après que l'acier fondu (9) à l'intérieur du système de chemin d'écoulement (53) s'est totalement écoulé de retour dans le four de fusion (2) le retrait de la chambre (6) et le détachement du moule (5) de la plaque plate (3) afin que l'acier fondu (9) à l'intérieur du moule (5) continue de refroidir.
  2. Procédé de versement en courant ascendant à pression négative selon la revendication 1, dans lequel la température de l'acier fondu (9) à l'intérieur du four de fusion (2) est entre 1 400 °C et 1 550 °C.
EP15155388.0A 2015-02-17 2015-02-17 Procédé de versement ascendant de pression négative Active EP3059029B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
RS20181003A RS57721B1 (sr) 2015-02-17 2015-02-17 Postupak sipanja povlačenjem naviše putem negativnog pritiska
PL15155388T PL3059029T3 (pl) 2015-02-17 2015-02-17 Sposób zalewania z odciągiem podciśnieniowym do góry
EP15155388.0A EP3059029B1 (fr) 2015-02-17 2015-02-17 Procédé de versement ascendant de pression négative
TR2018/12291T TR201812291T4 (tr) 2015-02-17 2015-02-17 Negatif basınçla yukarı doğru çekerek dökme yöntemi.
HUE15155388A HUE039983T2 (hu) 2015-02-17 2015-02-17 Negatív nyomású, felfelé áramlású öntési eljárás

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15155388.0A EP3059029B1 (fr) 2015-02-17 2015-02-17 Procédé de versement ascendant de pression négative

Publications (2)

Publication Number Publication Date
EP3059029A1 EP3059029A1 (fr) 2016-08-24
EP3059029B1 true EP3059029B1 (fr) 2018-06-13

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ID=52589244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15155388.0A Active EP3059029B1 (fr) 2015-02-17 2015-02-17 Procédé de versement ascendant de pression négative

Country Status (5)

Country Link
EP (1) EP3059029B1 (fr)
HU (1) HUE039983T2 (fr)
PL (1) PL3059029T3 (fr)
RS (1) RS57721B1 (fr)
TR (1) TR201812291T4 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10226850A (ja) * 1997-02-19 1998-08-25 Hitachi Metals Ltd 燃焼器用鋳鋼部品およびその製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1473246A (en) * 1922-07-12 1923-11-06 Montupet Leon Machine for filling molds
FR571370A (fr) * 1923-09-29 1924-05-16 Procédé et dispositif de moulage applicables aux métaux ou matières plastiques
BG33467A1 (en) * 1980-12-11 1983-03-15 Nikolov Method and machine for castind under presure
SE465711B (sv) * 1988-08-12 1991-10-21 Nils Lage Ingemar Tegnemo Saett och anordning vid gjutning av metall
US5355934A (en) * 1992-07-22 1994-10-18 Toyota Jidosha Kabushiki Kaisha Low pressure casting apparatus
JP3224778B2 (ja) * 1998-06-22 2001-11-05 中央精機株式会社 吸引鋳造方法及び吸引鋳造装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10226850A (ja) * 1997-02-19 1998-08-25 Hitachi Metals Ltd 燃焼器用鋳鋼部品およびその製造方法

Also Published As

Publication number Publication date
TR201812291T4 (tr) 2018-09-21
RS57721B1 (sr) 2018-12-31
PL3059029T3 (pl) 2018-11-30
HUE039983T2 (hu) 2019-02-28
EP3059029A1 (fr) 2016-08-24

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