WO2005030412A1 - Sleeve for use in sand moulding machines for foundries - Google Patents

Sleeve for use in sand moulding machines for foundries Download PDF

Info

Publication number
WO2005030412A1
WO2005030412A1 PCT/NO2004/000285 NO2004000285W WO2005030412A1 WO 2005030412 A1 WO2005030412 A1 WO 2005030412A1 NO 2004000285 W NO2004000285 W NO 2004000285W WO 2005030412 A1 WO2005030412 A1 WO 2005030412A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
shock absorbing
absorbing material
sand
sleeve according
Prior art date
Application number
PCT/NO2004/000285
Other languages
French (fr)
Inventor
Stephane Zerbin
Original Assignee
Elkem Asa
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 Elkem Asa filed Critical Elkem Asa
Publication of WO2005030412A1 publication Critical patent/WO2005030412A1/en

Links

Classifications

    • 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
    • B22C9/088—Feeder heads

Definitions

  • Sleeve for use in sand moulding machines for foundries.
  • This invention relates to a sleeve for use in sand moulding machines for foundries.
  • sleeves are used to create a space for molten metal which space during casting is filled with molten metal which is kept molten during the solidification of the casted piece and which molten metal flows back into the mould to cavity compensate for shrinkage during solidification of the metal in the mould cavity. In this way formations of so-called shrinkage cavity in the solidified cast piece is avoided.
  • the sleeve can not absorb the shock from the sand, the sleeve will break or at least crack. The result is deformation of the sleeves or that parts of the sleeve will drop down into the mould cavity during the flask rollover, resulting in that the casting will be contaminated with material from the sleeve.
  • EP 1.184.104 discloses a sleeve for solving this problem by using a sleeve consisting of two parts where an upper part during the impact of the sand slides down a certain distance relative to the lower part. This solution is, however, complicated and adds to the costs of the sleeve.
  • the present invention thus relates to a sleeve for use in sand moulding machines, which sleeve comprises a shock absorbing material affixed to the top of the sleeve.
  • the shock absorbing material can be any material that is plastically or elastically deformed during impact stress in the sand moulding process.
  • the shock absorbing material may also be a combination of a plastically and a elastically deformable material.
  • plastically deformable material is corrugated cardboard, but other plastically deformable materials can be used, such as plastic materials, sand agglomerates, sand contained in a paper, rubber or plastic bag, textiles, plant materials, deformable structures of metallic materials and others other plastically deformable materials.
  • elastically deformable material it can be used rubber, elastomer, springs and other elastic materials.
  • the shock absorbing material can be affixed to the top of the sleeve by gluing, by adhesive tape or by the use of an open-ended cylinder having an internal diameter equal to the outer diameter of the sleeve.
  • the open ended cylinder can be made from paper, cardboard, rubber or other suitable materials.
  • the sleeve according to the present invention is much less subjected to damage than conventional sleeves as the shock absorbing material will absorb impact stress during the sand moulding without transferring the stress to the sleeve.
  • the strength of the sleeve according to the invention is not very critical. This means that the sleeve can be made without reinforcing fibers.
  • the wall and the top of the sleeve can be made thinner, resulting in a reduced cost for the sleeve.
  • Figure 1 shows a sleeve equipped with a shock absorbing material according to the present invention.
  • Figure 2 shows a vertical cut along line A-A of Figure 1.
  • FIG. 1 and 2 there are shown a sleeve 1 having a breaker core 2 glued to the lower end of the sleeve 1.
  • the sleeve 1 and the breaker core 2 defines a cavity 3 intended to be filled with molten metal during casting.
  • the breaker core 2 has an opening 4 allowing molten metal to fill the cavity 3 during filling of the mould cavity with molten metal and allowing the molten metal to flow back into the mould cavity during solidification of the molten metal in the mould cavity.
  • a shock absorbing material 5 made from roll of a corrugated cardboard.
  • the shock absorbing material 5 is affixed to the top of the sleeve 1 by means of an open-ended cylinder 6 having an internal diameter equal to the outer diameter of the sleeve 1.
  • the open-ended cylinder 6 can be made of any suitable material such as paper or cardboard.
  • the shock absorbing material 5 can be affixed to the top of sleeve 1 by means of adhesive tape wrapped around the upper part of the sleeve and the lower part of the roll of corrugated cardboard.
  • the sleeve 1 with the shock absorbing material 5 is placed on the model pattern 7 in conventional way.
  • the pressure from the sand will deform the shock absorbing material 5, whereby the shock absorbing material will absorb the impact stress from the moulding process and the shock absorber 5 will thereby protect the sleeve 1 from the forces from the sand.
  • the sleeve 1 will be prevented from damage by the sand pressure during the moulding operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chutes (AREA)
  • Vibration Dampers (AREA)

Abstract

The present invention relates to a sleeve for use in sand moulding machines where the sleeve comprises a shock absorbing material affixed to the top of the sleeve for absorbing impact stress during the sand moulding.

Description

Title of invention
Sleeve for use in sand moulding machines for foundries.
Field of invention This invention relates to a sleeve for use in sand moulding machines for foundries.
Background Art
In moulding of sand moulds for foundries, sleeves are used to create a space for molten metal which space during casting is filled with molten metal which is kept molten during the solidification of the casted piece and which molten metal flows back into the mould to cavity compensate for shrinkage during solidification of the metal in the mould cavity. In this way formations of so-called shrinkage cavity in the solidified cast piece is avoided.
There is basically to practices to set a sleeve in a sand mould in automatic moulding machines in foundries. One practice is to insert the sleeve into a cavity made during moulding. In this practice the cavity has to be made from the pattern plate and the sleeve have to be perfectly calibrated in order to be inserted into the cavity. The other way is to place the sleeve on the pattern plate before the sand is filled, inserted or shoot into the mould. In this second way of setting the sleeve, the sand is frequently shooted at very high pressure, 6 bar or more. Squeeze moulding, jolt or impact moulding are also used. If the sleeve can not absorb the shock from the sand, the sleeve will break or at least crack. The result is deformation of the sleeves or that parts of the sleeve will drop down into the mould cavity during the flask rollover, resulting in that the casting will be contaminated with material from the sleeve.
EP 1.184.104 discloses a sleeve for solving this problem by using a sleeve consisting of two parts where an upper part during the impact of the sand slides down a certain distance relative to the lower part. This solution is, however, complicated and adds to the costs of the sleeve.
By the present invention it has now been provided a sleeve having a shock absorber which solves the problem of damage to the sleeve during moulding in a simple and cost effective way. The present invention thus relates to a sleeve for use in sand moulding machines, which sleeve comprises a shock absorbing material affixed to the top of the sleeve.
The shock absorbing material can be any material that is plastically or elastically deformed during impact stress in the sand moulding process.
The shock absorbing material may also be a combination of a plastically and a elastically deformable material.
One preferable plastically deformable material is corrugated cardboard, but other plastically deformable materials can be used, such as plastic materials, sand agglomerates, sand contained in a paper, rubber or plastic bag, textiles, plant materials, deformable structures of metallic materials and others other plastically deformable materials.
As elastically deformable material it can be used rubber, elastomer, springs and other elastic materials.
The shock absorbing material can be affixed to the top of the sleeve by gluing, by adhesive tape or by the use of an open-ended cylinder having an internal diameter equal to the outer diameter of the sleeve. The open ended cylinder can be made from paper, cardboard, rubber or other suitable materials.
The sleeve according to the present invention is much less subjected to damage than conventional sleeves as the shock absorbing material will absorb impact stress during the sand moulding without transferring the stress to the sleeve. Thus, the strength of the sleeve according to the invention is not very critical. This means that the sleeve can be made without reinforcing fibers. In addition the wall and the top of the sleeve can be made thinner, resulting in a reduced cost for the sleeve.
Short description of the drawings Figure 1 shows a sleeve equipped with a shock absorbing material according to the present invention.
Figure 2 shows a vertical cut along line A-A of Figure 1. Detailed description of the invention
On Figure 1 and 2 there are shown a sleeve 1 having a breaker core 2 glued to the lower end of the sleeve 1. The sleeve 1 and the breaker core 2 defines a cavity 3 intended to be filled with molten metal during casting. The breaker core 2 has an opening 4 allowing molten metal to fill the cavity 3 during filling of the mould cavity with molten metal and allowing the molten metal to flow back into the mould cavity during solidification of the molten metal in the mould cavity.
On the top of the sleeve 1 there is placed a shock absorbing material 5 made from roll of a corrugated cardboard. The shock absorbing material 5 is affixed to the top of the sleeve 1 by means of an open-ended cylinder 6 having an internal diameter equal to the outer diameter of the sleeve 1. The open-ended cylinder 6 can be made of any suitable material such as paper or cardboard. Alternatively the shock absorbing material 5 can be affixed to the top of sleeve 1 by means of adhesive tape wrapped around the upper part of the sleeve and the lower part of the roll of corrugated cardboard.
Before moulding, the sleeve 1 with the shock absorbing material 5 is placed on the model pattern 7 in conventional way. When sand is filled into the mould in the moulding machine, the pressure from the sand will deform the shock absorbing material 5, whereby the shock absorbing material will absorb the impact stress from the moulding process and the shock absorber 5 will thereby protect the sleeve 1 from the forces from the sand. Thus the sleeve 1 will be prevented from damage by the sand pressure during the moulding operation.
This means that the walls and the top of the sleeve 1 do not have to withstand the high pressure from the sand moulding and thus by use of the present invention the wall and the top of the sleeve 1 can be made thinner and thus less costly.

Claims

Claims:
1. A sleeve for use in sand moulding machines, characterized in that the sleeve comprises a shock absorbing material affixed to the top of the sleeve.
2. Sleeve according to claim ^characterized in that the shock absorbing material is a plastically deformable material.
3. Sleeve according to claim 2, characterized in that the plastically deformable material is corrugated cardboard, plastic materials, sand agglomerates, sand contained in paper, rubber or plastic bag, textiles, plant materials or deformable structures of metallic materials.
4. Sleeve according to claim 1, characterized in that the shock absorbing material is an elastic material.
5. Sleeve according to claim 4, characterized in that the elastic material is rubber, elastomers or springs.
6. Sleeve according to claim ^characterized in that the shock absorbing material is a combination of a plastically deformable material and an elastic material.
7. Sleeve according to claim 1, characterized in that the shock absorbing material is affixed to the top of the sleeve by gluing.
8. Sleeve according to claim 1, characterized in that the shock absorbing material is affixed to the top of the sleeve by means of an open-ended cylinder having an internal diameter equal to the outer diameter og the sleeve.
9. Sleeve according to claim ^characterized in that the shock absorbing material is affixed to the top of the sleeve by adhesive tape.
PCT/NO2004/000285 2003-09-29 2004-09-28 Sleeve for use in sand moulding machines for foundries WO2005030412A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20034337 2003-09-29
NO20034337A NO318367B1 (en) 2003-09-29 2003-09-29 Feeder sleeve for use in sand forming machines for stopperier

Publications (1)

Publication Number Publication Date
WO2005030412A1 true WO2005030412A1 (en) 2005-04-07

Family

ID=29417559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000285 WO2005030412A1 (en) 2003-09-29 2004-09-28 Sleeve for use in sand moulding machines for foundries

Country Status (2)

Country Link
NO (1) NO318367B1 (en)
WO (1) WO2005030412A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985392A1 (en) * 2007-04-18 2008-10-29 GTP-Schäfer Giesstechnische Produkte GmbH Feeder insert with floor area with metal cladding

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2309016A1 (en) * 1973-02-23 1974-08-29 Eduard Dr Ing Baur Feeder insert in casting mould - defines surrounding cavity which becomes filled with melt during pouring
JPS53130225A (en) * 1977-04-20 1978-11-14 Ebara Mfg Method of casting long structure
SU759208A1 (en) * 1976-11-17 1980-08-30 Vnii Litejnogo Mash Moulding machine for producing moulds
US4526338A (en) * 1984-04-23 1985-07-02 General Foundry Products Corporation High pressure molding riser
DE4119192A1 (en) * 1991-06-11 1992-12-17 Hoesch Ag Spring-supported feeder material for sand moulds - with spring area protected from sand and dust particles by a jar-shaped cover
DE29513017U1 (en) * 1995-08-12 1995-12-07 GTP Schäfer Gießtechnische Produkte GmbH, 41515 Grevenbroich Pressure-protected feeder insert
WO2003043761A2 (en) * 2001-11-20 2003-05-30 Gtp-Schäfer Giesstechnische Produkte Gmbh Feeder insert with protective cap

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2309016A1 (en) * 1973-02-23 1974-08-29 Eduard Dr Ing Baur Feeder insert in casting mould - defines surrounding cavity which becomes filled with melt during pouring
SU759208A1 (en) * 1976-11-17 1980-08-30 Vnii Litejnogo Mash Moulding machine for producing moulds
JPS53130225A (en) * 1977-04-20 1978-11-14 Ebara Mfg Method of casting long structure
US4526338A (en) * 1984-04-23 1985-07-02 General Foundry Products Corporation High pressure molding riser
DE4119192A1 (en) * 1991-06-11 1992-12-17 Hoesch Ag Spring-supported feeder material for sand moulds - with spring area protected from sand and dust particles by a jar-shaped cover
DE29513017U1 (en) * 1995-08-12 1995-12-07 GTP Schäfer Gießtechnische Produkte GmbH, 41515 Grevenbroich Pressure-protected feeder insert
WO2003043761A2 (en) * 2001-11-20 2003-05-30 Gtp-Schäfer Giesstechnische Produkte Gmbh Feeder insert with protective cap

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985392A1 (en) * 2007-04-18 2008-10-29 GTP-Schäfer Giesstechnische Produkte GmbH Feeder insert with floor area with metal cladding

Also Published As

Publication number Publication date
NO318367B1 (en) 2005-03-07
NO20034337D0 (en) 2003-09-29

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