EP0650787A1 - Procédé de compactage de matière de moulage de fonderie - Google Patents

Procédé de compactage de matière de moulage de fonderie Download PDF

Info

Publication number
EP0650787A1
EP0650787A1 EP94116287A EP94116287A EP0650787A1 EP 0650787 A1 EP0650787 A1 EP 0650787A1 EP 94116287 A EP94116287 A EP 94116287A EP 94116287 A EP94116287 A EP 94116287A EP 0650787 A1 EP0650787 A1 EP 0650787A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pressure gradient
molding
compression
sec
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
EP94116287A
Other languages
German (de)
English (en)
Other versions
EP0650787B1 (fr
Inventor
Kurt Fischer
Hans Riester
Hans Leutwiler
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.)
Georg Fischer Giessereianlagen AG
Original Assignee
Georg Fischer Giessereianlagen AG
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 Georg Fischer Giessereianlagen AG filed Critical Georg Fischer Giessereianlagen AG
Publication of EP0650787A1 publication Critical patent/EP0650787A1/fr
Application granted granted Critical
Publication of EP0650787B1 publication Critical patent/EP0650787B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • the present invention relates to a method for compressing foundry molding material, the molding material being introduced into a molding device with a model plate with a model and a molding and filling frame arranged thereon, by means of a compressed gas, the compressed gas being used at least for precompression.
  • the present invention is based on the object of proposing a method for compacting foundry molding material which ensures homogeneously compacted molds with high hardness, even in the case of models which are difficult in terms of shape, with significant differences in height of the model contour or with a small edge distance.
  • This object is achieved according to the invention in that the pre-compression surge is generated with two differently high pressure gradients.
  • a pressure curve according to the invention during the compression process is described and explained in more detail.
  • the pressure in the molding space is controlled with a low pressure gradient of approximately 3 bar / sec. elevated.
  • This first pressure section merges seamlessly into a much steeper pressure section which has a pressure gradient of 30 bar / sec. having.
  • the subsequent printing section leads to the final compression and can e.g. pneumatically mechanically etc.
  • the pressure increase preceding the known two-stage compression process causes the filled molding material to be fluidized.
  • the fluidity of the sand is improved by fluidization, so that the pre-compression of the molding material is improved in the subsequent second pressure increase. Since the increase in pressure immediately adjoins the increase in pressure, the flowability generated in the pressure section fully benefits the compression phase in the pressure section.
  • the molding material in the model plate area is in a state of fluidization. This significantly improves the compaction ability, especially in the narrow areas between model parts or molding boxes, so that after compaction has taken place, the root strength is increased significantly.
  • the pressure curve according to the invention is therefore particularly suitable for complicated shapes, particularly with deep bales.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP94116287A 1993-10-27 1994-10-15 Procédé de compactage de matière de moulage de fonderie Expired - Lifetime EP0650787B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH323693 1993-10-27
CH3236/93 1993-10-27

Publications (2)

Publication Number Publication Date
EP0650787A1 true EP0650787A1 (fr) 1995-05-03
EP0650787B1 EP0650787B1 (fr) 1998-05-27

Family

ID=4251600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116287A Expired - Lifetime EP0650787B1 (fr) 1993-10-27 1994-10-15 Procédé de compactage de matière de moulage de fonderie

Country Status (11)

Country Link
US (1) US5601777A (fr)
EP (1) EP0650787B1 (fr)
JP (1) JPH07164105A (fr)
KR (1) KR950011003A (fr)
BR (1) BR9404258A (fr)
CZ (1) CZ238594A3 (fr)
DE (1) DE59406076D1 (fr)
DK (1) DK0650787T3 (fr)
ES (1) ES2119044T3 (fr)
HU (1) HUT69252A (fr)
RU (1) RU94039291A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29925010U1 (de) * 1999-10-26 2008-09-04 Mincelco Gmbh Wasserglasgebundener Kernformstoff
DE60127231T2 (de) * 2000-04-13 2007-07-05 Sintokogio, Ltd., Nagoya Kompressionsverfahren für giess-sand und vorrichtung dafür
BR0106085A (pt) * 2000-04-21 2002-03-05 Sintokogio Ltd Máquina de moldagem e transportador de molde usado para a mesma

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740775A1 (de) * 1986-12-17 1988-07-07 Fischer Ag Georg Verfahren zum verdichten von koernigen formstoffen
EP0560116A1 (fr) * 1992-03-10 1993-09-15 Georg Fischer Giessereianlagen Ag Procédé de compactage de sable de moulage de fonderie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666426A5 (de) * 1984-06-25 1988-07-29 Fischer Ag Georg Formanlage.
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
CH682547A5 (de) * 1990-04-20 1993-10-15 Fischer Ag Georg Verfahren und Vorrichtung zum Verdichten von körnigen Formstoffen.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740775A1 (de) * 1986-12-17 1988-07-07 Fischer Ag Georg Verfahren zum verdichten von koernigen formstoffen
EP0560116A1 (fr) * 1992-03-10 1993-09-15 Georg Fischer Giessereianlagen Ag Procédé de compactage de sable de moulage de fonderie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HANS RIESTER: "Eine neue Generation der Impuls-Formtechnologie", GIESSEREI 76 (1989) 15 MAI, N0. 10/11, SEITE 342-349, DüSSELDORF *

Also Published As

Publication number Publication date
HU9403103D0 (en) 1994-12-28
HUT69252A (en) 1995-08-28
RU94039291A (ru) 1996-08-27
BR9404258A (pt) 1995-07-04
DK0650787T3 (da) 1999-03-22
EP0650787B1 (fr) 1998-05-27
ES2119044T3 (es) 1998-10-01
KR950011003A (ko) 1995-05-15
DE59406076D1 (de) 1998-07-02
US5601777A (en) 1997-02-11
JPH07164105A (ja) 1995-06-27
CZ238594A3 (en) 1995-08-16

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