EP0463911A1 - Verfahren, Giessform und Vorrichtung zum mehrstufigen Niederdruckgiessen von Metall - Google Patents

Verfahren, Giessform und Vorrichtung zum mehrstufigen Niederdruckgiessen von Metall Download PDF

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Publication number
EP0463911A1
EP0463911A1 EP91401544A EP91401544A EP0463911A1 EP 0463911 A1 EP0463911 A1 EP 0463911A1 EP 91401544 A EP91401544 A EP 91401544A EP 91401544 A EP91401544 A EP 91401544A EP 0463911 A1 EP0463911 A1 EP 0463911A1
Authority
EP
European Patent Office
Prior art keywords
well
mold
casting
stage
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.)
Granted
Application number
EP91401544A
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English (en)
French (fr)
Other versions
EP0463911B1 (de
Inventor
Pascal Sourlier
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.)
Pont a Mousson SA
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Pont a Mousson SA
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Publication date
Application filed by Pont a Mousson SA filed Critical Pont a Mousson SA
Publication of EP0463911A1 publication Critical patent/EP0463911A1/de
Application granted granted Critical
Publication of EP0463911B1 publication Critical patent/EP0463911B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • 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

Definitions

  • the present invention relates to metal casting under low pressure in a multi-stage blind sand mold. It relates firstly to a process for supplying the imprints of a mold in blind sand with several stages, in metal casting under low pressure, the supply taking place via a casting well and, on each stage, at least one intermediate channel starting from this well and attacks connecting this channel to the or each footprint.
  • the low pressure casting technique (see for example FR-A-2 295 808, 2 367 566 and 2 556 996 in the name of the Applicant) is particularly advantageous, compared to gravity casting, for producing metal parts with thin wall and / or of complex shape and / or of large dimensions. Indeed, the pressure exerted by the metal, which results from the injection of a gas into a sealed pocket containing the liquid metal, can be controlled at will so as to push the metal into all the recesses of the imprints.
  • the method according to the invention aims to remedy these drawbacks.
  • the method according to the invention is characterized in that the flow of liquid metal is throttled, on each stage, at the inlet of the intermediate channels.
  • the invention also relates to a blind sand mold intended for the implementation of such a method.
  • This mold of the type comprising a pouring well and at least two stages at each of which is provided at least one imprint supplied via attacks connected to the tapping well by at least one intermediate channel, is characterized in that the sum of the areas of the inlet sections of the intermediate channels of each stage is significantly less than the area of the section of the tapping well.
  • the invention also relates to a low pressure metal casting installation in a blind sand mold with several floors, of the type comprising a casting ladle from which a feed tube opens upwards, a gas source under pressure connected to the ladle, at least one blind sand mold comprising a casting well open at the bottom and at least two stages on each of which is provided at least one footprint fed via attacks connected to the casting well by at least one intermediate channel, and means for applying the base of the tapping well to the opening of the supply tube, characterized in that the mold conforms to the definition above.
  • the installation shown in Fig. 1 comprises an enclosure 1 forming a pocket or reserve of liquid metal 2, a frame 3 for mold support and a sand mold 4. It is applied to low pressure casting of cast iron (gray cast iron or spheroidal graphite cast iron), steel or a superalloy in the mold 4. Apart from the internal configuration of this mold, the installation is identical to that described in the aforementioned FR-A-2 295 808.
  • the pocket 1, fixed has an upper cover 5 tightly fixed to its side walls and locked by suitable means (not shown).
  • a pouring nozzle 6 passes through an orifice 7 formed in the cover 5.
  • This nozzle 6 comprises a tubular lower part 8 whose outside diameter corresponds to the diameter of the orifice 7 and an upper part 9, of generally frustoconical shape, which s' presses tightly on the periphery of the orifice 7 by its large flat base 10.
  • a seal 11 formed by an asbestos bead is housed in a groove formed in the base 10 of the nozzle.
  • the nozzle 6 is traversed by a conduit or supply tube 12 made of refractory material dipping into the cast iron up to the vicinity of the bottom of the pocket 1; the upper part of the duct 12 opens out at the center of the nozzle 6, at the level of the planar upper face of the latter.
  • the bag 1 is connected to a source 13 of pressurized gas by a conduit 14, the communication of the bag 1 with the pressure source 13 or with the atmosphere effected by a suitable device 15 outside the bag.
  • a pressure gauge 16 makes it possible to monitor the pressure prevailing inside the pocket during pouring.
  • the frame 3 comprises posts 17 provided at their base with wheels 18 carried by two rails 19.
  • the posts 17 are joined at their upper end by a ceiling 20 carrying a jack 21 directed downwards and whose piston rod 22 carries, articulated at its lower end, a support plate 23.
  • the posts 17 also each carry a flange 24 on which a helical spring 25 rests.
  • a horizontal support plate 26 can slide vertically along part of the: posts 17 located above the flanges 24; this plate 26 is in constant abutment on the upper end of the springs 25 and is urged by them upwards. When no downward pressure is applied to the plate 26, the latter is at a level higher than that of the upper face of the nozzle 6.
  • a circular opening 27, of sufficient diameter to allow the nozzle 6 to pass is provided in the plate 26.
  • the mold 4 is a solid multi-stage blind mold, for example with three stages, as shown in FIG. 2. It comprises a vertical pouring well 28, of circular section approximately equal to that of the supply tube 12. This well is open at its base, which has a housing 29 having a tapered flared shape combined with that of the nozzle 6. It extends to a certain distance from the upper end face of the mold.
  • each stage is identical, and the structure of each stage appears in FIG. 3. From the casting well 28, two channels 30A and 30B leave horizontally, which extend in the extension of one another, on either side of the well 28.
  • the stage also comprises two indentations 31 of elongated shape , identical.
  • Each footprint, which extends on either side of the well 28, is fed by three attacks. In the example shown, there is for each fingerprint an attack 32A on one side of the well and two attacks 32B on the other side.
  • the three attacks 32A connect the fingerprints to channel 30A, and the three attacks 32B connect them to channel 30B.
  • each channel 30A or 30B connects the casting well to all: the attacks located on the same side of the well 28 and therefore participates in the supply of the two footprints of the floor.
  • Channels 30A and 30B have a relatively small section. More precisely, the sum of the areas of the sections of the intermediate channels 30A, 30B of a stage is much less than the area of the section of the taphole 28, for example less than 10% of this area. If the channels are of variable section, it is their input section which fulfills this condition.
  • the sum of the areas of the attack sections fed by the same channel is at least equal to the area of the section, or of the entry section, of this channel.
  • the operation of the installation is as follows: the frame 3 being distant from the pocket 1, an appropriate refractory seal 33 is applied to the bottom of the housing 29 of the mold 4.
  • the mold 4, containing in each cavity a non-core shown, is placed on the plate 26 and centered on the opening 27 thereof, then the frame 3 is brought to the rails 19 above the pocket 1 of liquid iron so that the nozzle 6 is located opposite the housing 29 of the mold.
  • the jack 21 is then extended so as to lower, by means of the plate: 23, the mold 4 and its support 26 against the force of the springs 25. This operation clamps the seal 33 between the bottom of the housing 29 and the nozzle 6 and ensures the tight connection of the pouring well to the supply tube.
  • the bag 1 is then connected to the pressure source 13 by operating the device 15.
  • the pressure acting on the free surface of the cast iron makes it rise in the tube 12.
  • the cast iron fills the well 28 of the mold, the channels 30A and 30B and the imprints 31.
  • the pressure is maintained for a time determined according to the dimensions and the shapes of the parts to be obtained.
  • the well 28 plays during this time the role of reserve or counterweight by bringing to the imprints the additional liquid cast iron intended to compensate for the withdrawals.
  • the attacks and the intermediate channels solidify, the gas pressure is brought back to atmospheric pressure in the pocket 1, by operation of the device 15, and the liquid iron being in the well 28 and in the tube 12 goes back down in the pocket 1 by evacuating these two conduits.
  • the liquid metal rises rapidly in well 28, the metallostatic pressure is established in the channels on each stage, and the two cavities of each stage are supplied by the pair of channels 30A and 30B corresponding.
  • the narrowness of the intermediate channels limits the flow of metal flowing therein, which leads on the one hand to a better controlled filling, quieter and reproducible for each of the imprints of the different stages, and on the other hand minimal metal displacement with each pour. This is further favored by the relaxation of the liquid metal at its entry into the attacks, resulting from the aforementioned dimensioning of these. This ultimately results in an improvement in the health of the castings.
  • the relaxing effect of the metal can, as a variant, be favored by an increasing section, from upstream to downstream, of the intermediate channels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
  • Mold Materials And Core Materials (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP91401544A 1990-06-22 1991-06-11 Verfahren, Giessform und Vorrichtung zum mehrstufigen Niederdruckgiessen von Metall Expired - Lifetime EP0463911B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007860A FR2663570B1 (fr) 1990-06-22 1990-06-22 Procede, moule et installation pour la coulee de metal multi-etages sous basse pression.
FR9007860 1990-06-22

Publications (2)

Publication Number Publication Date
EP0463911A1 true EP0463911A1 (de) 1992-01-02
EP0463911B1 EP0463911B1 (de) 1995-03-22

Family

ID=9397915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401544A Expired - Lifetime EP0463911B1 (de) 1990-06-22 1991-06-11 Verfahren, Giessform und Vorrichtung zum mehrstufigen Niederdruckgiessen von Metall

Country Status (16)

Country Link
EP (1) EP0463911B1 (de)
JP (1) JPH07112593B2 (de)
AT (1) ATE120113T1 (de)
BR (1) BR9102619A (de)
CA (1) CA2044879C (de)
CS (1) CS188191A3 (de)
DE (1) DE69108306T2 (de)
DK (1) DK0463911T3 (de)
ES (1) ES2071941T3 (de)
FI (1) FI96097C (de)
FR (1) FR2663570B1 (de)
HU (1) HU206845B (de)
MX (1) MX173409B (de)
NO (1) NO178367C (de)
PL (1) PL168033B1 (de)
RU (1) RU2046034C1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8304525B2 (en) 2005-03-15 2012-11-06 Universiti Malaya Glycolipids of branched chain alkyl oligosaccharides for liquid crystal and related applications
CN109317620A (zh) * 2018-11-30 2019-02-12 马鞍山市华威冶金机械有限公司 一种批量浇铸双螺杆挤塑机筒体衬套的模具及其浇铸方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6350050B2 (ja) * 2014-07-10 2018-07-04 大同特殊鋼株式会社 減圧吸引鋳造方法
CN108080588B (zh) * 2018-01-22 2021-03-16 铜陵求精机械有限公司 一种铸渣机铸渣模
RU207520U1 (ru) * 2021-07-08 2021-11-01 Акционерное общество «Научно-производственная корпорация «Уралвагонзавод» имени Ф.Э. Дзержинского» Устройство для управления заливкой металла под низким давлением в форму

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656539A (en) * 1969-01-29 1972-04-18 Amsted Ind Inc Apparatus for casting molten metal
FR2295808A1 (fr) * 1974-12-24 1976-07-23 Pont A Mousson Procede et installation de coulee sous basse pression en moule en sable
US4112997A (en) * 1977-02-28 1978-09-12 Hitchiner Manufacturing Co., Inc. Metal casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656539A (en) * 1969-01-29 1972-04-18 Amsted Ind Inc Apparatus for casting molten metal
FR2295808A1 (fr) * 1974-12-24 1976-07-23 Pont A Mousson Procede et installation de coulee sous basse pression en moule en sable
US4112997A (en) * 1977-02-28 1978-09-12 Hitchiner Manufacturing Co., Inc. Metal casting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8304525B2 (en) 2005-03-15 2012-11-06 Universiti Malaya Glycolipids of branched chain alkyl oligosaccharides for liquid crystal and related applications
CN109317620A (zh) * 2018-11-30 2019-02-12 马鞍山市华威冶金机械有限公司 一种批量浇铸双螺杆挤塑机筒体衬套的模具及其浇铸方法

Also Published As

Publication number Publication date
ATE120113T1 (de) 1995-04-15
FR2663570B1 (fr) 1992-09-18
FI96097B (fi) 1996-01-31
FR2663570A1 (fr) 1991-12-27
NO912403L (no) 1991-12-23
NO912403D0 (no) 1991-06-20
NO178367B (no) 1995-12-04
PL290755A1 (en) 1992-02-24
HU912080D0 (en) 1991-12-30
JPH07112593B2 (ja) 1995-12-06
DE69108306T2 (de) 1995-08-03
CS188191A3 (en) 1992-06-17
CA2044879A1 (fr) 1991-12-23
DK0463911T3 (da) 1995-08-14
FI96097C (fi) 1996-05-10
FI913009A0 (fi) 1991-06-19
CA2044879C (fr) 1996-02-06
HUT59045A (en) 1992-04-28
MX173409B (es) 1994-03-01
PL168033B1 (pl) 1995-12-30
RU2046034C1 (ru) 1995-10-20
FI913009A (fi) 1991-12-23
HU206845B (en) 1993-01-28
DE69108306D1 (de) 1995-04-27
EP0463911B1 (de) 1995-03-22
JPH04231143A (ja) 1992-08-20
NO178367C (no) 1996-03-13
ES2071941T3 (es) 1995-07-01
BR9102619A (pt) 1992-01-21

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