EP0171304A1 - Einrichtung zur Herstellung von gefrorenen Formen und Formkernen - Google Patents

Einrichtung zur Herstellung von gefrorenen Formen und Formkernen Download PDF

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Publication number
EP0171304A1
EP0171304A1 EP85401273A EP85401273A EP0171304A1 EP 0171304 A1 EP0171304 A1 EP 0171304A1 EP 85401273 A EP85401273 A EP 85401273A EP 85401273 A EP85401273 A EP 85401273A EP 0171304 A1 EP0171304 A1 EP 0171304A1
Authority
EP
European Patent Office
Prior art keywords
wall
block
frozen
cavity
orifices
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
EP85401273A
Other languages
English (en)
French (fr)
Other versions
EP0171304B1 (de
Inventor
Daniel Goumy
Charles Defrancq
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
Priority to AT85401273T priority Critical patent/ATE35922T1/de
Publication of EP0171304A1 publication Critical patent/EP0171304A1/de
Application granted granted Critical
Publication of EP0171304B1 publication Critical patent/EP0171304B1/de
Expired 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
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/126—Hardening by freezing

Definitions

  • the present invention relates to a device for manufacturing molds or molding cores of humidified and frozen particles, of the type comprising a particle receiving cavity provided with at least one forming wall, means for blowing a refrigerant in said cavity through this wall, and gas discharge means located opposite this wall.
  • the forming wall is a thin porous wall, which is not entirely satisfactory from the point of view of production rates, the surface condition of the molds or cores produced and the mechanical properties of these objects. .
  • the invention aims to provide a device capable of producing in a very short time molds or cores having an excellent surface condition, good forma stability and high and homogeneous mechanical properties, so that it can be used in automatic systems producing mass-produced molded parts.
  • the invention relates to a device of the aforementioned type, characterized in that the forming wall consists of a surface of a solid block made of a thermally conductive material.
  • the block is pierced with a multitude of orifices which extend between said wall and an opposite surface of the block which delimits, in service, a coolant supply chamber.
  • the device shown in the drawing is intended for the production of frozen sand half-molds. It essentially consists of three rigid parts: a gassing box 1, a chassis 2 and a head 3 for recovering gases.
  • the gassing box 1 is fixed, of parallelepiped shape, open upwards.
  • This box is provided in a side wall with a thermally insulated pipe 3 equipped with a valve 4 for supplying a coolant, and, in the opposite side wall, with a vent pipe 5 equipped with a valve 6.
  • the refrigerant fluid is a cryogenic fluid such as nitrogen gas being in the vicinity of the desired freezing temperature (for example of the order of -100 ° C), or compressed air or a another suitable gas cooled to a temperature of the same order by heat exchange, for example with liquid nitrogen.
  • the chassis 2 open at its upper and lower ends, has the same rectangular horizontal section as the gassing box 1. Like the latter, it is thermally insulated. In its lower part is fixed a solid block 7 of aluminum forming a model plate and pierced with a multitude of vertical orifices 8. The lower face of the block 7 is flat and horizontal and is flush with the lower end edge of the chassis 2, while its upper face 9 constitutes the wall for forming the half-molds to be produced. Thus, the block 7 has a variable thickness depending on the shape that it is desired to give to these half-molds.
  • Each orifice 8 crosses the block 7 from the lower face to the upper face thereof. At its upper outlet, it is provided with a filter 10 for retaining the sand.
  • the density of orifices 8 per unit area of this wall is substantially proportional to the thickness of sand which overcomes this location during the freezing operation, which will be described later. This proportionality can however be corrected locally to take into account other factors such as the proximity of the chassis 2, the aim being to obtain, at the latest at the end of freezing, a substantially horizontal isothermal surface at the top of the clod of frozen sand despite the non-planar shape of the wall 9.
  • the gas reception head 3 is a thermally insulated parallelepiped box whose horizontal section is the same as that of the chassis 2. Its underside is pierced with a series of openings 11 each equipped with a filter 12 for retaining the sand , and its side walls have openings 13 for discharging gas.
  • the device thus described operates in the following manner.
  • the frame 2 carrying the block 7 is put in place on the gassing box 1, delimiting therewith a chamber 14 for supplying the refrigerant.
  • the block 7 is cold, that is to say that it is at a temperature much below 0 ° C.
  • the head 3 is kept at a certain distance from the chassis 2.
  • the mass of sand to be frozen, previously moistened, is then "pulled” into the chassis 2 by applying thereto a firing head (not shown) in a conventional manner.
  • the vent pipe 5 allows the blowing gas and the air contained in the chassis 2 to escape during this firing operation.
  • the valve 4 is opened, so that the coolant fills the chamber 14, passes through the orifices 8 of the block 7, passes through the mass of sand 16, yielding its frigories to it and is evacuated through the openings 11 and 13 of the head 3.
  • the freezing of the sand takes place and, when its desired temperature (for example -100 ° C.) is reached, the valve 4 is closed and the frozen clod of sand is removed from the mold.
  • the head 3 is raised, the chassis is pulled out horizontally from the device, and the frozen clod is pushed upwards out of this chassis by ejection rods (not shown) which pass through corresponding passages provided in the plate- block 7 model.
  • the forming wall 9 is provided on a solid block 7 made of a metal which is a good conductor of heat, this block has a high thermal inertia, so that it remains cold between the end of a freezing operation and the start of the next sandblasting.
  • the wall 9 is able to supply the sand with a sufficient amount of frigories so that the latter immediately begins to freeze as soon as it comes into contact.
  • a frozen crust of sand is formed almost instantaneously which allows the mass of sand to easily withstand the mechanical force due at gas pressure. From experience, this frozen crust has proven to be very favorable for obtaining a good surface condition and good shape stability of the objects produced.
  • the fixed gassing box 1 can be supplied with cold gas by a rigid pipe 3 located at the rear of the machine, while no moving part of the device requires connection with a thermally insulated pipe. This is very favorable both from the point of view of the construction of the device and that of its location in a molding installation, in particular for foundries.
  • a solid block 7 of aluminum has been used, having a thickness varying between 1.5 and 3.5 cm and comprising 100 to 110 orifices 8 per square meter, with a section for the total passage of the orifices of 8 at 10 cm 2 / m 2 , and 0.75 to 1 Nm 3 of cold air per kilogram of sand to be cooled. It was thus possible to freeze in clumps of sand 5 cm thick in less than 30 seconds and obtain the advantages indicated above (mechanical properties, shape stability, surface condition).
  • the device according to the invention can be easily adapted to the simultaneous production of two half-molds or to the manufacture of molding cores, and that the sand can be replaced by any other type of particulate material suitable for such applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Confectionery (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP85401273A 1984-06-27 1985-06-25 Einrichtung zur Herstellung von gefrorenen Formen und Formkernen Expired EP0171304B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401273T ATE35922T1 (de) 1984-06-27 1985-06-25 Einrichtung zur herstellung von gefrorenen formen und formkernen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8410107A FR2566687B1 (fr) 1984-06-27 1984-06-27 Dispositif de fabrication de moules ou de noyaux de moulage congeles
FR8410107 1984-06-27

Publications (2)

Publication Number Publication Date
EP0171304A1 true EP0171304A1 (de) 1986-02-12
EP0171304B1 EP0171304B1 (de) 1988-07-27

Family

ID=9305483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401273A Expired EP0171304B1 (de) 1984-06-27 1985-06-25 Einrichtung zur Herstellung von gefrorenen Formen und Formkernen

Country Status (8)

Country Link
US (1) US4644995A (de)
EP (1) EP0171304B1 (de)
JP (1) JPS6114045A (de)
AT (1) ATE35922T1 (de)
AU (1) AU573499B2 (de)
CA (1) CA1246830A (de)
DE (1) DE3563919D1 (de)
FR (1) FR2566687B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105033193A (zh) * 2015-08-15 2015-11-11 重庆市合川区云天机械制造有限公司 防烫伤的制作砂型模具的装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802970A1 (de) * 1988-02-02 1989-08-10 Werner Klaus Verfahren zum herstellen von formteilen
US7611811B2 (en) * 2005-12-22 2009-11-03 Xerox Corporation Imaging member
JP5572793B2 (ja) * 2010-09-03 2014-08-20 株式會社三共合金鑄造所 凍結鋳造用鋳型の製造方法
CN102211138B (zh) * 2011-06-10 2012-09-05 河南豫兴铸造有限公司 组芯式铸造模具中芯盒的成型方法
CN106424553B (zh) * 2016-12-14 2018-07-10 苏州明志科技有限公司 一种芯盒排气调整控制装置
CN114012071B (zh) * 2021-09-26 2023-09-15 芜湖泓鹄材料技术有限公司 基于风冷技术解决汽车冲压模具铸件型面异常的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1537471A (en) * 1975-08-14 1978-12-29 Booth & Co Ltd W H Foundry mould production
EP0077247A1 (de) * 1981-10-09 1983-04-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Verfahren und Vorrichtung zum Herstellen von metallischen Gegenständen durch Giessen in Sandformen oder ähnlichen Formen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3587709A (en) * 1965-12-27 1971-06-28 Sherwin Williams Co Foundry sand forming method
US4312397A (en) * 1980-04-14 1982-01-26 Dependable-Fordath, Inc. Process for forming shell molds
JPS5722844A (en) * 1980-07-12 1982-02-05 Sintokogio Ltd Casting method
JPS5728653A (en) * 1980-07-28 1982-02-16 Agency Of Ind Science & Technol Manufacture of frozen mold
JPS57106445A (en) * 1980-12-23 1982-07-02 Sintokogio Ltd Mold making method
JPS57106444A (en) * 1980-12-25 1982-07-02 Chuzo Gijutsu Fukiyuu Kyokai Quick freezing method for frozen mold
SU1014627A1 (ru) * 1981-02-02 1983-04-30 Предприятие П/Я А-3470 Способ замораживани литейных форм
SU971558A1 (ru) * 1981-04-03 1982-11-07 Предприятие П/Я А-3470 Устройство дл подачи сжиженного газа в форму
JPS5835041A (ja) * 1981-08-25 1983-03-01 Nippon Kokan Keishiyu Kk シエル鋳型の製造方法
GB2110578B (en) * 1981-11-24 1985-08-14 Sintokogio Ltd Method of making mold
DE3210588A1 (de) * 1982-03-23 1983-10-06 Hans Uwe Dr Ing Ehlbeck Giessform zum herstellen von metallgussstuecken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1537471A (en) * 1975-08-14 1978-12-29 Booth & Co Ltd W H Foundry mould production
EP0077247A1 (de) * 1981-10-09 1983-04-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Verfahren und Vorrichtung zum Herstellen von metallischen Gegenständen durch Giessen in Sandformen oder ähnlichen Formen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 86 (M-131)[964], 25 mai 1982, page 12 M 131; & JP - A - 57 22 844 (SHINTO KOGYO K.K.) 05-02-1982 *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 93 (M-133)[971], 2 mai 1982, page 43 M 133; & JP - A - 57 28 653 (KOGYO GIJUTSUIN) 16-02-1982 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105033193A (zh) * 2015-08-15 2015-11-11 重庆市合川区云天机械制造有限公司 防烫伤的制作砂型模具的装置

Also Published As

Publication number Publication date
ATE35922T1 (de) 1988-08-15
FR2566687A1 (fr) 1986-01-03
AU4416985A (en) 1986-01-02
EP0171304B1 (de) 1988-07-27
AU573499B2 (en) 1988-06-09
DE3563919D1 (en) 1988-09-01
FR2566687B1 (fr) 1986-08-22
JPS6114045A (ja) 1986-01-22
US4644995A (en) 1987-02-24
CA1246830A (fr) 1988-12-20

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