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WO1988006501A1 - Procede et dispositif de coulage de pieces moulees metalliques - Google Patents

Procede et dispositif de coulage de pieces moulees metalliques Download PDF

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Publication number
WO1988006501A1
WO1988006501A1 PCT/EP1988/000134 EP8800134W WO8806501A1 WO 1988006501 A1 WO1988006501 A1 WO 1988006501A1 EP 8800134 W EP8800134 W EP 8800134W WO 8806501 A1 WO8806501 A1 WO 8806501A1
Authority
WO
WIPO (PCT)
Prior art keywords
casting
mold
casting mold
prechamber
molten metal
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.)
Ceased
Application number
PCT/EP1988/000134
Other languages
German (de)
English (en)
Inventor
Herbert Schilling
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.)
Eisenwerk Bruehl GmbH
Original Assignee
Eisenwerk Bruehl GmbH
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 Eisenwerk Bruehl GmbH filed Critical Eisenwerk Bruehl GmbH
Publication of WO1988006501A1 publication Critical patent/WO1988006501A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/08—Shaking, vibrating, or turning of moulds

Definitions

  • the invention relates to a method for casting meta. " ! ⁇ form- pieces by pouring the .Melt in at least one in the area of the top of a casting mold, which is connected via at least one channel with the lower 25th. Area of the mold space.
  • mold space within the scope of the present invention means that part of the
  • the voids formed during the solidification of the metal become here depending on the shape of the casting taken up by one or more risers which are connected to the mold space and are connected to it laterally or above and which significantly exceed the highest level of the mold space in relation to the casting position of the mold.
  • the volume of such risers is to be dimensioned in such a way that the melt in the riser is the last to freeze, thus ensuring that the blowholes formed can form in the riser.
  • the invention has for its object to provide a method that is independent of the application.
  • Casting method 10 by reducing the amount of molten metal to be used per casting results in a reduction in the energy costs to be used and at the same time a high throughput, i.e. allows the casting of a large number of castings in succession in a short time sequence. 15
  • the molten metal inside the casting mold is first passed through at least one prechamber arranged below the mold space, and after 20 complete filling of the mold space with molten metal . ' the mold is pivoted about a horizontal axis.
  • This procedure has the advantage that the casting mold is filled from the bottom up and that after the mold space has been completely filled with the molten metal in the antechamber, the last one to flow in
  • Melt amount is included, which thus has the highest temperature of the entire filling volume. If the filling opening is now closed immediately after the filling process has been completed and the casting mold is pivoted about a horizontal axis, the pivoting angle essentially being based on the shape of the casting to be produced, so that the antechamber lies above the molding space, so that Part of the molten metal contained in the antechamber the function of the riser. Since this part of the molten metal has a higher temperature level in comparison to the part of the molten metal contained in the molding space, since it was filled in last, it can now be compared with the previously known casting methods.
  • the cycle times can be shortened further if the devices for carrying out the method are designed accordingly, since the reduced melt quantity per casting also shortens the casting times and the casting mold is removed from the casting device immediately after the casting process has been completed and the turning, if necessary, after closing the filling opening can be made. As a result, the pouring opening of the casting device is released again and the next casting mold can be filled.
  • the number of gate openings and the number of prechambers required for each casting depend on the shape of the casting itself.
  • the angle by which the casting mold is pivoted depends on the assignment of the prechamber to the mold space, so that pivoting around one may also occur An angle of 90 ° is sufficient.
  • the invention further relates to a casting mold for casting metal moldings according to the above-described method, with at least one pouring opening arranged in the area of the upper side, which is connected to the lower area of the molding space via at least one channel.
  • At least one prechamber is arranged within the casting mold, based on the positioning during filling, below the mold space, which on the one hand connects with the channel and on the other hand with the Forr. ' aum 1 is connected and that the casting mold is designed to be pivotable about a horizontal axis.
  • the prechamber takes over the function of the riser.
  • the volume of the prechamber can be kept considerably lower than that of conventional riser volumes 5, since the molten metal in the prechamber has the highest temperature and this ensures that the voids form in the prechamber when the melt solidifies.
  • the mold can now be pivoted in various ways. 0 For example, in that the casting mold has a molding box which is provided on two opposite sides with journals, by means of which the casting mold can be pivoted in a corresponding device after the casting process has ended and the filling opening has been closed.
  • the casting mold with or without an enclosing box, but can also be designed in its external shape and in its strength so that it is detected with the help of a manipulator after completion of the casting process, transported away from the casting station and at the same time during this transport or ® subsequently this transport can be rotated around a horizontal axis. In the case of a rotation through 180 °, which should be the most appropriate in the majority of cases, the casting mold can then be set down by the manipulator onto a conveying device which takes over the removal.
  • the means for closing the pouring opening can be integrated in the casting mold, for example in the form of corresponding closure flaps which are connected to the mold, or by plugs which can be inserted into the pouring opening, the plugs can be inserted here by a corresponding device which is connected to the manipulator for turning the casting mold.
  • a suitable design and orientation of the pouring opening and the channel leading to the prechamber it may also be possible, depending on the size of the shape and the volume content, to dispense with a closure of the filling opening.
  • the pouring opening with its associated channel is arranged such that it lies on the initially upward-moving side of the casting mold with respect to the pivoting movement after the casting process has ended, so that the melt contained in this area can specifically flow into a collecting device without a suction lifter effect on the contents in the antechamber.
  • the prechamber at least partially has a shape approximating the spherical shape.
  • a shape allows the specific surface area which is decisive for the cooling of the melt volume in the prechamber to be reduced, so that the cooling curve which is decisive for the effectiveness of a riser can be maintained with a considerably lower melt volume than this is possible with the usual riser shapes.
  • the metal melt contained in the prechamber and acting as a riser has the highest temperature of the total melting volume, which also has a positive effect on the dimensioning volume of the prechamber. has a reducing effect.
  • the prechamber in the region of its end facing away from the molding space has surface areas running approximately parallel to one another, at least on opposite sides.
  • Fig. 2 shows the casting mold.
  • Fig. 1 in turned
  • Fig. 3 is an end view of the molded
  • a casting mold 1 is used, which is essentially formed by a conventional molding material 2.
  • the molding material 2 can be held in a molding box, into which it is introduced under compression.
  • the molding material can also, and preferably, be inherently stable, as is the case when using binders.
  • the advantage here is the larger porosity, which allows better gas passage when filling the melt.
  • the casting mold 1 can also be designed as a mold.
  • the molding material 2 encloses a molding space 3, in which, depending on the type of casting, cores are also inserted, so that the contour of the metal molding to be produced is given as a cavity by the molding space with the cores used.
  • a pre-chamber 4 is connected to the molding space and is arranged below the molding space 3 with respect to the casting position shown in FIG. 1.
  • a channel 5 opens into the antechamber 4 in the lower region, which is led up to the top of the mold and at a distance from the mold space 3 and opens into the pouring opening 6 located on the top of the mold 1.
  • the antechamber 4 is essentially spherical. If the metal molding to be produced is a housing-shaped component, for example a pump housing, a gear housing or the like with correspondingly thin walls, it will generally be necessary for casting reasons to provide several prechambers, which then also have an elongated shape can.
  • the corners are largely rounded off in such a spatial shape for the prechambers, in order to largely reduce the specific wall surfaces related to the prechamber volume, in order to result in a temperature delay in the solidification of the molten metal in the Antechamber 1 to arrive.
  • the casting mold shown in FIG. 1 is now filled with a molten metal via the pouring opening 5.
  • This filling process can be carried out in the usual way via a crucible or in the manner, as indicated in FIG. 1, by docking the filling opening 6 onto a bottom spout 7 'of a melt container 8.
  • the metal flowing in via the channel 5 - Q melt now first reaches the pre-chamber 4 and then passes into the mold space 3.
  • the air or gas volume enclosed by the pre-chamber 4 and the mold space 3 escapes through separate ventilation openings or when using a corresponding molding material through the gas-permeable 5 pores of the molding material .
  • the casting mold is pivoted about a horizontal axis, in the embodiment 0 shown for example by 180 °, so that it assumes the position shown in FIG. 2.
  • the pouring opening 6 is closed by a closing means before the pivoting or the shape, as shown in the schematic drawing, is pivoted in the direction of arrow 9, so that the one contained in the channel 5 Metal melt can run out into a corresponding collecting device, but no suction lifting effect is exerted by this process on the melting volume contained in the pre-chamber 4.
  • the main amount of the metal melt then solidifies. Since the pre-chamber 4 was fed with fresh metal melt to the end during the casting process, while the melt ascending into the mold space, even if slightly, is already cooling, the melt contained in the pre-chamber 4 shows at the end of the casting process the highest temperature of the molten metal enclosed by the casting mold. After swiveling is the prechamber 4 containing the hottest part of the melt above the molding space and thus takes over the function of a riser.
  • the heat dissipation from the melt contained in the prechamber can be additionally influenced, so that a further reduction of the prechamber volume is possible without this desired blow hole formation in the antechamber is hindered, ie that the molten metal solidifies in the casting mold from bottom to top, the melting volume solidifying in the antechamber last.
  • the amount of metal enclosed by the pre-chamber 4 is separated from the raw casting after it has been shaped and then melted again. A reduction in the prechamber volume thus leads directly to a noticeable reduction in the melting costs per casting.
  • the end view of the molded raw casting 10 shown in FIG. 3 shows that two, for example parallel, surface areas are formed on the metal piece 4 ′ formed by the prechamber 4. These surface areas 11 now allow the shaped but still hot raw casting 10 to be fed to the further processing stations with the aid of one or more successive manipulators, for example a shaking process for removing the core molding enclosed by the casting, the separation of the channel set. until finally to the station ⁇ in which the part 4 'is separated from the metal molding 3'.
  • the surface areas 11 can to a certain extent also run at an angle to each other in order to achieve a better hold in the gripping device of the manipulator.
  • the confluence in the prechamber 4 is expediently set higher, so that a corresponding reduction in the amount of metal to be re-melted can be reduced even further.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Lors du coulage de pièces métalliques moulées (4') en versant du métal fondu dans au moins une ouverture de coulée (6) agencée du côté supérieur d'un moule (1) et en communication avec la partie inférieure de l'espace intérieur du moule (3) par l'intermédiaire d'au moins un canal (5), le métal fondu se trouvant dans le canal (5) est nécessaire pour assurer la formation d'une retassure à l'extérieur de la pièce coulée. A cet effet, on utilise un évent de dimensions suffisantes, ou on maintient la pression de coulée. Selon l'invention, on fait passer le métal fondu à l'intérieur du moule de coulée (1) tout d'abord à travers au moins un vestibule (4) agencé au-dessous de l'espace intérieur du moule (3) et en communication avec celui-ci. Lorsque l'espace intérieur du moule est complètement rempli, on fait basculer (9) le moule de coulée autour d'un axe horizontal et on le retire de la station de coulée. La dernière portion de métal fondu versée dans le moule, c'est-à-dire la portion dont la température est la plus élevée, se retrouve ainsi à la fin du processus de coulée au-dessus de la pièce coulée et assume la fonction d'un évent, ce qui permet de réduire la quantité de déchets d'au moins la moitié par rapport au procédé conventionnel.
PCT/EP1988/000134 1987-03-04 1988-02-24 Procede et dispositif de coulage de pieces moulees metalliques Ceased WO1988006501A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873706929 DE3706929A1 (de) 1987-03-04 1987-03-04 Verfahren zum giessen von metallformstuecken und vorrichtung zur durchfuehrung des verfahrens
DEP3706929.2 1987-03-04

Publications (1)

Publication Number Publication Date
WO1988006501A1 true WO1988006501A1 (fr) 1988-09-07

Family

ID=6322247

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000134 Ceased WO1988006501A1 (fr) 1987-03-04 1988-02-24 Procede et dispositif de coulage de pieces moulees metalliques

Country Status (2)

Country Link
DE (1) DE3706929A1 (fr)
WO (1) WO1988006501A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6540007B2 (en) 1998-03-10 2003-04-01 Montupet S.A. Molding process for the mass production of aluminum alloy castings and associated items of equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE598272C (de) * 1933-03-26 1934-06-11 Fried Krupp Grusonwerk Akt Ges Vorrichtung zum Wenden und anschliessenden Schwingen von Kokillen
FR2397246A1 (fr) * 1977-07-13 1979-02-09 Mitsubishi Heavy Ind Ltd Procede de moulage et moule forme sous vide
JPS56111567A (en) * 1980-02-07 1981-09-03 Kobe Steel Ltd Rolling over casting method
JPH0664750A (ja) * 1992-08-21 1994-03-08 Murata Mach Ltd パレタイジング方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE598272C (de) * 1933-03-26 1934-06-11 Fried Krupp Grusonwerk Akt Ges Vorrichtung zum Wenden und anschliessenden Schwingen von Kokillen
FR2397246A1 (fr) * 1977-07-13 1979-02-09 Mitsubishi Heavy Ind Ltd Procede de moulage et moule forme sous vide
JPS56111567A (en) * 1980-02-07 1981-09-03 Kobe Steel Ltd Rolling over casting method
JPH0664750A (ja) * 1992-08-21 1994-03-08 Murata Mach Ltd パレタイジング方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 5, Nr. 190 (M-100)(862), 4. Dezember 1981; & JP-A-56111567 (KOBE SEIKOSHO K.K.) 3. September 1981 *
Patent Abstracts of Japan, Band 9, nr. 202 (M-405)(1925), 20. August 1985; & JP-A-6064750 (TOUKAI RIKA DENKI SEISAKUSHO K.K.) 13. April 1985 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6540007B2 (en) 1998-03-10 2003-04-01 Montupet S.A. Molding process for the mass production of aluminum alloy castings and associated items of equipment

Also Published As

Publication number Publication date
DE3706929A1 (de) 1988-09-15

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