EP0077247A1 - Procédé et installation de fabrication de pièces métalliques par moulage en sable ou analogue - Google Patents

Procédé et installation de fabrication de pièces métalliques par moulage en sable ou analogue Download PDF

Info

Publication number
EP0077247A1
EP0077247A1 EP82401791A EP82401791A EP0077247A1 EP 0077247 A1 EP0077247 A1 EP 0077247A1 EP 82401791 A EP82401791 A EP 82401791A EP 82401791 A EP82401791 A EP 82401791A EP 0077247 A1 EP0077247 A1 EP 0077247A1
Authority
EP
European Patent Office
Prior art keywords
metal parts
manufacturing metal
molding
forming walls
forming
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.)
Withdrawn
Application number
EP82401791A
Other languages
German (de)
English (en)
French (fr)
Inventor
Charles Defrancq
Claude Godino
Daniel Goumy
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0077247A1 publication Critical patent/EP0077247A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/126—Hardening by freezing

Definitions

  • the present invention relates to the manufacture of metal parts by molding, of the type in which one develops, by using forming walls such as chassis and model, and from a molding material consisting of humidified particles, a structure rigid intended to serve either as a mold receiving the molten metal, or as cores intended to be placed in such a mold.
  • a structure rigid intended to serve either as a mold receiving the molten metal, or as cores intended to be placed in such a mold.
  • more or less moistened sand is used as particles, to which are added products capable of ensuring, during the molding operation, the rigidity of the shaped structure, these products generally being chemicals, such as desiccated silicate or resins.
  • the preparation of such composite structures is relatively complex, therefore costly, and moreover has drawbacks during unhooking which consists in reducing again into particles the rigid structure temporarily created for molding and which is recycled for a new operation.
  • the subject of the present invention is a manufacturing process which is simple and inexpensive to implement, which eliminates any pollution of the environment, which ensures an extremely simple stripping operation and which suppresses the regeneration of the particulate material after molding, while ensuring correct mechanical strength of the particle structure.
  • the invention is part of this observation, which is known per se, that the rigidity of a structure of humidified particles can be ensured by cooling to a temperature much lower than setting in ice using a refrigerant which can be, for for example, liquid nitrogen during vaporization or any other suitable fluid. It has been proposed to produce such molds by spraying the surface of the mold with a spray of liquid nitrogen or by passing the molds shaped into a frame inside a low temperature refrigeration tunnel.
  • the humidification of the molding material is carried out before its introduction between the forming walls where cooling is provided.
  • the molding material in the insufficiently humidified state is previously cooled before its introduction between the forming walls and humidification is ensured by a homogeneous distribution of water in the material during its transfer to said forming walls.
  • the cooling of the structure occurs first by solid conduction between the forming walls in the cooled state and the materials of the structure, then, if necessary, the temperature specified above is reached by adding a regularly distributed coolant. in the mass of said structure.
  • This last operation can be carried out by circulation of a transit coolant through said structure, advantageously by blowing a coolant but the regularly distributed coolant can also be made up of coolant particles, for example nitrogen at the state of mist or spray, or carbon dioxide snow, intimately mixed with the molding material, just before formation of the structure to be stiffened and advantageously, during the transfer operation to the forming walls.
  • the invention also relates to an installation for implementing the above method.
  • a molding installation essentially comprises a device for developing a sand structure 1, a device for supplying sand 2, or firing head, a head for refrigeration 3.
  • the device for developing a sand structure 1 essentially comprises a chassis-housing 4 formed from side walls 11, a bottom 12 and a wall-cover 13, the assembly being divided in the median plane into two half complementary parts 18 and 19 separated from each other by a model plate 14, essentially consisting of a central support plate 15 and two half-models 16 and 17, the juxtaposition, face against face, in l absence of the support plate 15 represents the shape of the part to be molded.
  • These two half-parts 18 and 19 are carried by piston rods 20 and 21.
  • the housing is thermally insulated at 22.
  • the cover plate 13 is equipped with inlet passages 23 and 24 which are intended to come opposite with clearances 25, 26, respectively formed in a bottom plate 27 of the firing head 2, the seal between the firing head 2 and the device 1 then being provided by seals 28.
  • This firing head 2 is adapted to move, with spacing or approximation according to the arrows f 1 , f 2 relative to the device 1 on the one hand and, on the other hand, in translation according to the arrows f 3 and f 4 to come below a hopper sand loading 28.
  • the bottom wall 12 is equipped with outlet passages 29, 30, with a sand stop grid.
  • the refrigeration head 3 consists of a wall 31 insulated at 32 with a recess 33, the radial extension of which is such that it covers the passages 23 and 24 of the device 1, as shown in the drawings and the seal is also ensured here by a seal 34.
  • the recess 33 of this refrigeration head 3 communicates by a conduit 36 and a flexible tube 37 with an outlet 38 d an exchanger 39, an inlet 40 of which is supplied via a pipe 41 with refrigeration gas from a reservoir 42, this refrigeration gas possibly being, for example, compressed air or nitrogen gas.
  • the exchanger 39 is cooled by a winding 43 connected by a thermostatic valve 44 to a liquid nitrogen tank 45.
  • FIG. 2 it can be seen that the invention is applied to an installation of the same kind as that of FIG. 1, except that it is a question here of forming rigid structures 50 intended to constitute mold cores and no longer mold walls, these cores 50 then being placed in a manner known per se in mold frames which have been produced according to the technique described with reference to FIG. 1, or according to any other previously known technique.
  • the invention is also applied to the formation of two half-molds 61 and 62 obtained here again by the presence of a model plate 63, held inside a chassis 64 in which the inlet passages for sand and coolant 65 and 66 can still be recognized here.
  • a model plate 63 held inside a chassis 64 in which the inlet passages for sand and coolant 65 and 66 can still be recognized here.
  • the main outlet passages for the coolant 67 and 68 which are fitted with filters 69 and 70 adapted to retain the sand, but also, additional inlet passages 71 and 72 have been provided which are connected to the same source of refrigerant gas as the main passages 65 and 66.
  • FIG. 3 shows additional outlets at the most inaccessible place of the model in the form of a ring 73 connected: to an inner pipe 75 towards an outlet 76. This ensures local diversion along f 4 , f ′ 4 of the flow of refrigerant gas, precisely in the most inaccessible angle of the model.
  • FIG. 5 it can be seen here that, for the formation of two complementary half-molds of the same type as those encountered in the preceding figures, there is here a model plate which is made wholly or partly in porous wall 90, this hollow model being connected at its upper end to an outlet 91, while refrigerant gas inlet passages are formed at different points of the frame at 92, 93, 94, 95, 96, 97, so to create currents which are indicated by the arrows extending all around the model 90.
  • the refrigerating fluid thus passes regularly, in a uniform way, through the porous wall of the model and escapes by the exit 91 to the atmosphere.
  • FIG. 6 represents the same model structure as that represented in FIG. 5, with the essential difference that the model plate 100 produced in porous wall, is here connected at its upper end to an inlet passage 101 of refrigerated gas, which passes uniformly through the porous wall 102 constituting this model 100 to flow into the mass of sand, before escaping to the lower outlet passages 103, 104 and upper 105 and 106.
  • a firing head 120 contains sand previously moistened and the cooling by the supply of a cooling fluid is ensured by a nozzle 121 formed in a transfer duct 122 and connected to a source of cooling fluid which can be of liquid nitrogen or carbon dioxide under pressure which will be expanded during its distribution in the grains of sand being transferred to the forming walls 123.
  • the grains of sand in the firing head 130 are in the insufficiently humidified state and a rehumidification by spraying is carried out in a transfer duct 131 between firing head 130 and forming walls 133. of water by means of a nozzle 134, then cooling by spraying a cooling fluid by means of a nozzle 135.
  • FIG. 9 represents a model 140 intended to be inserted into forming walls, as has been represented in FIG. 1.
  • the model 140 comprises a metal plate 141 having protrusions such as 142 which are complementary and represent the shape of the object to be manufactured, and protrusions such as 143 forming a source pouring duct.
  • the plate 141 is pierced with a plurality of channels 144, leading to clearances 145 closed two by two by studs 146 so as to form a continuous duct 147, for a refrigerant admitted at 148 and withdrawn at 149.
  • the plate- support 141 is advantageously trivialized, that is to say that the parts of the model 142 are removable and therefore changed from one manufacture to another without modification of the support plate itself, which forms a heat exchanger for cooling the sand surrounding by simple thermal conduction.
  • cooling frames by simple thermal conduction, and in this case, as shown in FIG. 10, it suffices to provide cooling coils 170, 170 ′, in thermal contact externally against certain forming walls. 171 of a chassis 172.
  • FIG. 11 shows schematically the adap tion of the invention to a conventional molding line so as to increase its productivity.
  • a conventional chain 150 comprises a firing head 151 and forming walls 152, 153, intended to make a structure of molding sand 154, and the various structures 154a, 154b, 154c, 154d, are pushed in a train, so as to form between two structures, for example 154c and 154d, a molding cavity 155.
  • a cryogenic chain 160 has been arranged which comprises, as described with reference to FIG.
  • the refrigeration device 164 is supplied with refrigerant by a pipe 167 provided with an exchanger 168, in which the coolant is cooled by liquid nitrogen coming from a tank 169.
  • the cryogenic sand structures 165 are stored in a waiting tunnel 170 for keeping cold, before t to be transferred by a device 171 to the main chain 150, where they are inserted between the molding structures 154, at the rate of one structure 165 for three structures 154, which makes it possible to improve productivity by 30% .
  • a cooling head 180 for the sand placed in a molding frame 181 is supplied via the valve 182 with air at -78 ° C at 7 bars withdrawn from a buffer tank 183 charged with air in 184 cooled in an exchanger 185 by heat exchange with carbon dioxide flowing in passages 186, this cold carbon dioxide resulting from the expansion by the valve 187 of a gas stream from a liquid carbon dioxide tank 188 at -20 ° C under a pressure of 20 bars.
  • Temperature regulation is ensured by a thermal probe 189 controlling the opening or closing of the valve relaxation 187.
  • a gassing head 190 of a molding frame 191 is directly supplied with carbon dioxide at -50 ° C. under a pressure of 7 bars from a storage tank 193, through a valve 192, so that the gas is further cooled, this carbon dioxide at -50 ° C resulting from expansion through a valve 194 of liquid carbon dioxide at -20 ° C at 20 bars.
  • a gassing head 200 of a molding frame 201 a gaseous mixture at -78 ° C of air and carbon dioxide from a cooling mixer tank 202 with baffles 203, supplied with a portion of air under pressure of 7 bars in 204 and in liquid carbon dioxide sprayed in 205 from a storage tank 206 of liquid carbon dioxide at -20 ° C. under 20 bars.
  • a circulation turbine 207 cooperates with the baffles 203 to ensure the homogenization of the refrigerated composite gas thus formed.
  • sand molded test pieces were prepared which were cooled to gradually decreasing temperatures from -10 ° C to a value close to -120 ° C to -140 ° C and we noted each time the flexural strength R in kg-cm2.
  • Curves A and B were obtained with sand having a water content of 4% and 6% respectively with simple conduction cooling, while curves C and D were also obtained with sand having a water content of 4 % and 6t respectively, but with gas cooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP82401791A 1981-10-09 1982-10-01 Procédé et installation de fabrication de pièces métalliques par moulage en sable ou analogue Withdrawn EP0077247A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119038 1981-10-09
FR8119038A FR2514274A1 (fr) 1981-10-09 1981-10-09 Procede et installation de fabrication de pieces metalliques par moulage en sable ou analogue

Publications (1)

Publication Number Publication Date
EP0077247A1 true EP0077247A1 (fr) 1983-04-20

Family

ID=9262892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401791A Withdrawn EP0077247A1 (fr) 1981-10-09 1982-10-01 Procédé et installation de fabrication de pièces métalliques par moulage en sable ou analogue

Country Status (4)

Country Link
EP (1) EP0077247A1 (OSRAM)
JP (1) JPS5874243A (OSRAM)
CA (1) CA1209780A (OSRAM)
FR (1) FR2514274A1 (OSRAM)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566687A1 (fr) * 1984-06-27 1986-01-03 Air Liquide Dispositif de fabrication de moules ou de noyaux de moulage congeles
WO1997001407A1 (en) * 1995-06-24 1997-01-16 Air Products And Chemicals, Inc. Method for forming a mould for use in casting and mould formed by said method
KR20240068656A (ko) * 2022-11-04 2024-05-17 난징 유니버시티 오브 에어로노틱스 앤드 애스트로노틱스 내부 미세다공을 이용한 냉동 사형의 여러 경로를 통한 고효율 냉동방법 및 장치

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5958892B2 (ja) * 2012-01-23 2016-08-02 国立研究開発法人産業技術総合研究所 凍結中子の製造方法及びそれに用いられる中子造型用型枠
CN112077262A (zh) * 2020-09-03 2020-12-15 北京机科国创轻量化科学研究院有限公司 一种冷冻复合铸型3d打印成形方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA447141A (en) * 1948-03-09 Forbes Blackwood Peter Casting apparatus
GB1537471A (en) * 1975-08-14 1978-12-29 Booth & Co Ltd W H Foundry mould production
DE2909839A1 (de) * 1979-03-13 1980-09-25 Linde Ag Verfahren zum herstellen einer giessform
FR2454859A1 (fr) * 1979-04-28 1980-11-21 Inst Odlewnictwa Procede de durcissement des moules et noyaux de fonderie par voie de congelation des composants liquides du sable

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584249A (en) * 1978-12-16 1980-06-25 Nippon Sanso Kk Production of mold
JPS566754A (en) * 1979-06-27 1981-01-23 Kubota Ltd Freezing method of refrigerating mold
JPS56128640A (en) * 1980-03-13 1981-10-08 Sintokogio Ltd Molding method of green sand mold

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA447141A (en) * 1948-03-09 Forbes Blackwood Peter Casting apparatus
GB1537471A (en) * 1975-08-14 1978-12-29 Booth & Co Ltd W H Foundry mould production
DE2909839A1 (de) * 1979-03-13 1980-09-25 Linde Ag Verfahren zum herstellen einer giessform
FR2454859A1 (fr) * 1979-04-28 1980-11-21 Inst Odlewnictwa Procede de durcissement des moules et noyaux de fonderie par voie de congelation des composants liquides du sable

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566687A1 (fr) * 1984-06-27 1986-01-03 Air Liquide Dispositif de fabrication de moules ou de noyaux de moulage congeles
EP0171304A1 (fr) * 1984-06-27 1986-02-12 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dispositif de fabrication de moules ou de noyaux de moulage congelés
US4644995A (en) * 1984-06-27 1987-02-24 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for fabricating frozen moulding moulds or cores
WO1997001407A1 (en) * 1995-06-24 1997-01-16 Air Products And Chemicals, Inc. Method for forming a mould for use in casting and mould formed by said method
KR20240068656A (ko) * 2022-11-04 2024-05-17 난징 유니버시티 오브 에어로노틱스 앤드 애스트로노틱스 내부 미세다공을 이용한 냉동 사형의 여러 경로를 통한 고효율 냉동방법 및 장치
EP4393618A4 (en) * 2022-11-04 2025-03-05 Nanjing University of Aeronautics and Astronautics EFFICIENT MULTI-WAY INTERNAL MICROPOROUS COOLING PROCESS AND APPARATUS FOR A FROZEN SAND MOLD
AU2023370591B2 (en) * 2022-11-04 2025-10-23 Nanjing University Of Aeronautics And Astronautics Multi-path internally-microporous efficient refrigeration method and device for frozen sand mold

Also Published As

Publication number Publication date
JPS5874243A (ja) 1983-05-04
FR2514274B1 (OSRAM) 1984-05-25
FR2514274A1 (fr) 1983-04-15
CA1209780A (fr) 1986-08-19

Similar Documents

Publication Publication Date Title
CN106715003B (zh) 铁金属铸件的制造方法
EP0010914B1 (en) Method and apparatus for moulding plastics articles from particulate plastics material
EP0077247A1 (fr) Procédé et installation de fabrication de pièces métalliques par moulage en sable ou analogue
EP0412111A1 (fr) Dispositif de fabrication de billes de glace et application a la projection de ces billes de glace pour les traitements de surface.
FR2845028A1 (fr) Procede de rotomoulage d'une piece comprenant une couche en mousse thermoplastique
FR2523880A1 (fr) Moule de coulee pour la fabrication de pieces coulees metalliques, et dispositif et procede de fabrication de ce moule
EP0225203B1 (fr) Procédé et tunnel de refroidissement superficiel de produits alimentaires
EP2357049B1 (fr) Procede de moulage à modèle perdu et installation pour la mise en oeuvre de ce procede
EP0393061B1 (fr) Enceinte refrigeree mobile pour denrees alimentaires
EP0854334A1 (fr) Bac de réception de neige carbonique
FR2534832A1 (fr) Appareil et technique de coulee directe en coquille de metaux
CA1246830A (fr) Dispositif de fabrication de moules ou de noyaux de moulage congeles
FR2764779A1 (fr) Procede et installation pour le moulage par trempage de pieces diverses
EP2244872B1 (fr) Dispositif de moule pour machine de rotomoulage et machine de rotomoulage le comprenant.
CH682390A5 (fr) Conteneur pour le transport d'un matériau en état solide.
EP0379410B1 (fr) Dispositif pour la fixation et le refroidissement d'un bloc en graphite d'une paroi en graphite d'un moule
FR2628014A1 (fr) Procede et dispositif pour enrober des particules solides d'un film continu d'une matiere protectrice
FR2634413A1 (fr) Procede de realisation par moulage d'une piece creuse en matiere plastique
FR2935276A1 (fr) Procede de moulage a modele perdu et moule pour ce procede
US3429361A (en) Method and apparatus for producing metal castings using molten metal cooled before teeming
KR100891953B1 (ko) 다이캐스팅 방법
FR2687942A1 (fr) Procede et dispositif de moulage de noyaux en sable de fonderie contenant une resine durcissable, permettant d'eviter le colmatage de buses d'injection du sable.
US20070277952A1 (en) Rapid localized directional solidification of liquid or semi-solid material contained by media mold
FR2579517A1 (fr) Procede de fabrication et installation de fabrication d'un film plastique
BE1018999A5 (fr) Procede et dispositif pour la fabrication d'une cible de pulverisation cathodique magnetron.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19821006

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19860416

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GOUMY, DANIEL

Inventor name: DEFRANCQ, CHARLES

Inventor name: GODINO, CLAUDE