EP0973623A1 - Method for the manufacture of cores for metal casting processes - Google Patents
Method for the manufacture of cores for metal casting processesInfo
- Publication number
- EP0973623A1 EP0973623A1 EP98903132A EP98903132A EP0973623A1 EP 0973623 A1 EP0973623 A1 EP 0973623A1 EP 98903132 A EP98903132 A EP 98903132A EP 98903132 A EP98903132 A EP 98903132A EP 0973623 A1 EP0973623 A1 EP 0973623A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- trimethylamine
- sand
- metering device
- core
- gaseous
- 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
Links
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
- B22C9/123—Gas-hardening
-
- 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
Definitions
- This invention is concerned with a method for the manufacture of cores for metal casting processes.
- urethane Cold Box Process which utilises amines as catalyst or curing agent, and which is described in an article in the special issue of Giesserei 78 (1991), volume 11 , pages 372 to 374.
- a moulding composition which contains a benzyl ether resin (ortho-phenol resol) and an isocyanate, and which is cured using a tertiary amine as catalyst.
- TMA trimethylamine
- the accelerating effect of a tertiary amine by the formation of reactive transitional compounds during the polyurethane reaction is described by the following reaction equation :
- the object of the present invention is to provide a method for the manufacture of cores for metal casting processes in which the above disadvantages are largely avoided, while at the same time providing a method which can be carried out in a relatively cost effective manner.
- a method for the manufacture of sand cores for metal casting processes in which gaseous trimethylamine is conducted through parts of a metering device (3) and then, in a concentration of from 0.01 to 0.12 % wt. % based on the quantity of sand used per core, it is conducted into a core shooting machine (4) where it is brought into contact with the sand, wherein prior to the introduction of the gaseous trimethylamine into the core shooting machine (4) a purging gas is introduced, and wherein for a quantity T of trimethylamine the quantity L of purging gas used is in the ratio of T : L of from 1 : 1000 to 1 : 10000.
- the sand which is fed into the core shooting machine has already been mixed with a benzyl ether resin and an isocyanate so that core production can take place according to the principles of the urethane Cold Box Process.
- General conveying equipment for gases may be used, for example a metering device in which the quantity of trimethylamine is suitably adjusted by means of a control chain or by a regulator. Accordingly the equipment may consist of several parts, such as conveying equipment, measuring apparatus, controllers etc., or it may be manufactured as a single unit.
- the gaseous trimethylamine is conducted through a part of the metering device, although it need not flow through all of the parts.
- liquid trimethylamine to flow through several parts of the metering device, and then be transformed to the gaseous phase, and flow through the remaining parts of the metering device in the gaseous form.
- an extreme odour nuisance can be largely avoided, so that expensive insulation of parts of the core making installation is not necessary.
- advantageously there is no odour nuisance during subsequent storage of the manufactured cores. It is also surprising that an almost stoichiometric conversion of the trimethylamine can be achieved so that the method of the invention can be carried out cost effectively because of the relatively low amounts of trimethylamine which are used.
- the introduction of the purging gas may take place before or after the metering device. It is advantageous that the sand in the core shooting machine is contacted simultaneously by the trimethylamine and the purging gas so that an extreme odour nuisance can also be completely avoided during core storage, because the core is purged by the purging gas at the same time that it is exposed to the trimethylamine.
- the purging gas is introduced directly into the metering device.
- the trimethylamine is supplied in liquid form to metering bellows forming part of a metering device, and thereafter it is conducted in gaseous form through a measuring, controlling or regulating unit which also forms part of the metering device.
- Trimethylamine is normally available commercially in liquid form.
- the triethylamine comes into contact with the sand, which has already been mixed with a benzyl ether resin and an isocyanate, in the core shooting machine, it is advantageously converted to the gaseous phase. This makes possible relatively simple homogeneous mixing of the trimethylamine with sand, and at the same time increases reactivity of the trimethylamine.
- the conversion of the trimethylamine form the liquid phase to the gaseous phase can be achieved advantageously by introducing the trimethylamine into metering bellows.
- the metering bellows remains able to function better than other conveying equipment.
- the gaseous trimethylamine is passed through a measuring, controlling or regulating unit, which is able to dispense the desired specified quantity of trimethylamine which is to be used.
- This information is transferred directly to the metering bellows by means of a circuit, and is there changed into the corresponding setting for the stroke of the metering bellows. It is particularly advantageous that the metering bellows can take a relatively simple form because it can readily be adapted for use on existing core making equipment.
- Figure 1 is a simplified, schematic process flow diagram of a method for the manufacture of cores for metal casting processes according to the invention
- FIG. 2 is a simplified, schematic process flow diagram of another embodiment of the method of the invention.
- sand which has already been mixed with a benzyl ether resin and an isocyanate, is taken out of sand mixer (5) and transported to a core shooting machine (4) by means of conduit (10).
- a cylinder (1) contains liquid trimethylamine and is warmed with the aid of a water bath (8). Heating is achieved by means of a heating coil (7) which is connected directly to a heating apparatus (6). Conversion of the trimethylamine from the liquid phase to the gaseous phase results from the application of heat.
- the gaseous trimethylamine is passed through conduit (2) to a metering device (3). In the metering device (3) the amount of trimethylamine is measured , and is adjusted to the desired amount according to a given specified value.
- the trimethylamine is passed through conduit (9) into the core shooting machine (4) in a concentration of 0.01 to 0.12 wt. % based on the weight of sand being used per core, and makes contact with the sand there.
- purging air is introduced to the conduit (2) through conduit (11) and valve (12) so that during introduction of the trimethylamine through the conduit (9) into the core shooting machine (4) air purging of the sand in the core shooting machine (4) takes place at the same time.
- metering bellows (3a) and measuring, controlling and regulating unit (3b) together form a metering device corresponding to the metering device (3) of Figure 2.
- Trimethylamine is present as a liquid in cylinder (1).
- valve (15) When valve (15) is closed liquid trimethylamine is conducted into the metering bellows (3a) via open valve (13). Thereby the trimethylamine expands and is largely converted to the gaseous phase.
- the setting of the stroke of the metering bellows (3a) is made by means of circuit (14) according to the given specified value of the measuring, controlling or regulating unit (3b).
- valve (13) when the valve (13) is closed, the gaseous trimethylamine is conducted via valve (15), which been opened, into the measuring, controlling or regulating unit (3b).
- Addition of purging air is achieved by means of conduit (11) and valve (12). Since the metering bellows (3a) and the measuring, controlling or regulating unit (3b) together correspond to the metering device (3) of Figure 1 , the addition of purging air in the Figure 2 embodiment also takes place directly into the metering device.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Devices For Molds (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19706472 | 1997-02-19 | ||
DE19706472A DE19706472C1 (en) | 1997-02-19 | 1997-02-19 | Foundry core production using tri:methyl-amine catalyst with cost-effective odour control |
PCT/GB1998/000351 WO1998036859A1 (en) | 1997-02-19 | 1998-02-04 | Method for the manufacture of cores for metal casting processes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0973623A1 true EP0973623A1 (en) | 2000-01-26 |
EP0973623B1 EP0973623B1 (en) | 2002-01-16 |
Family
ID=7820783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98903132A Expired - Lifetime EP0973623B1 (en) | 1997-02-19 | 1998-02-04 | Method for the manufacture of cores for metal casting processes |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0973623B1 (en) |
JP (1) | JP2001511710A (en) |
KR (1) | KR20000071196A (en) |
CN (1) | CN1252020A (en) |
AR (1) | AR005411A1 (en) |
AT (1) | ATE211954T1 (en) |
AU (1) | AU733863B2 (en) |
BR (1) | BR9807578A (en) |
CA (1) | CA2282309A1 (en) |
DE (2) | DE19706472C1 (en) |
TR (1) | TR199902016T2 (en) |
TW (1) | TW404865B (en) |
WO (1) | WO1998036859A1 (en) |
ZA (1) | ZA98938B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2333986B (en) * | 1998-02-10 | 2001-04-04 | Dean Anthony Jones | Improvements relating to heating and to casting core production |
KR101579549B1 (en) * | 2015-01-23 | 2015-12-22 | 에이비이씨기업 주식회사 | How to neutralize the stench of amine gas for cold box process, and amine gas generator containing the same |
CN105945242B (en) * | 2016-06-30 | 2018-08-31 | 施密特钢轨技术(昆山)有限公司 | One kind is easily demoulding to penetrate sand mobile work platform |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2413537C2 (en) * | 1974-03-21 | 1984-11-15 | Horst-Werner Ing.(Grad.) 7707 Engen Michel | Device for manufacturing cores for foundry purposes |
US4293480A (en) * | 1979-05-11 | 1981-10-06 | Ashland Oil, Inc. | Urethane binder compositions for no-bake and cold box foundry application utilizing isocyanato-urethane polymers |
US4362204A (en) * | 1980-03-17 | 1982-12-07 | The Mead Corporation | Method and apparatus for curing a foundry core |
JPS59153543A (en) * | 1983-02-22 | 1984-09-01 | Chuzo Gijutsu Fukiyuu Kyokai | Process for supplying hardening gas in gas hardening mold |
JPS60132639A (en) * | 1983-06-01 | 1985-07-15 | Naniwa Seisakusho:Kk | Gas generating apparatus for molding cold box casting mold |
DE4431560A1 (en) * | 1994-09-05 | 1996-03-07 | Gtg Gieserei Technik Romeo Goe | Prodn. of a sand mould element, e.g. mould cores |
-
1997
- 1997-02-19 DE DE19706472A patent/DE19706472C1/en not_active Expired - Fee Related
-
1998
- 1998-02-04 WO PCT/GB1998/000351 patent/WO1998036859A1/en not_active Application Discontinuation
- 1998-02-04 CN CN98804135A patent/CN1252020A/en active Pending
- 1998-02-04 KR KR1019997007486A patent/KR20000071196A/en not_active Application Discontinuation
- 1998-02-04 AU AU59960/98A patent/AU733863B2/en not_active Ceased
- 1998-02-04 EP EP98903132A patent/EP0973623B1/en not_active Expired - Lifetime
- 1998-02-04 DE DE69803170T patent/DE69803170T2/en not_active Expired - Fee Related
- 1998-02-04 CA CA002282309A patent/CA2282309A1/en not_active Abandoned
- 1998-02-04 BR BR9807578A patent/BR9807578A/en unknown
- 1998-02-04 TR TR1999/02016T patent/TR199902016T2/en unknown
- 1998-02-04 AT AT98903132T patent/ATE211954T1/en not_active IP Right Cessation
- 1998-02-04 JP JP53635298A patent/JP2001511710A/en active Pending
- 1998-02-05 ZA ZA98938A patent/ZA98938B/en unknown
- 1998-02-18 TW TW087102217A patent/TW404865B/en not_active IP Right Cessation
- 1998-02-19 AR ARP980100740A patent/AR005411A1/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9836859A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU5996098A (en) | 1998-09-09 |
AR005411A1 (en) | 1999-06-23 |
DE69803170D1 (en) | 2002-02-21 |
ATE211954T1 (en) | 2002-02-15 |
DE19706472C1 (en) | 1998-06-04 |
WO1998036859A1 (en) | 1998-08-27 |
BR9807578A (en) | 2000-03-21 |
DE69803170T2 (en) | 2002-10-31 |
TR199902016T2 (en) | 1999-12-21 |
ZA98938B (en) | 1998-08-07 |
AU733863B2 (en) | 2001-05-31 |
KR20000071196A (en) | 2000-11-25 |
EP0973623B1 (en) | 2002-01-16 |
TW404865B (en) | 2000-09-11 |
CA2282309A1 (en) | 1998-08-27 |
JP2001511710A (en) | 2001-08-14 |
CN1252020A (en) | 2000-05-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4089206A (en) | Method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials | |
JP2001504391A (en) | Production of homogeneous gas mixture using SF lower 6 | |
US4166799A (en) | Apparatus formation of gaseous mixtures and method of use | |
ATE66444T1 (en) | METHOD AND EQUIPMENT FOR THE MANUFACTURE OF BODIES, IN PARTICULAR COMPONENTS FROM MATERIAL TO BE HARDENED. | |
EP0973623B1 (en) | Method for the manufacture of cores for metal casting processes | |
US4112515A (en) | Mixing catalyst and carrier gas for curing foundry molds and cores | |
US4362204A (en) | Method and apparatus for curing a foundry core | |
EP0160314B1 (en) | Vapor generator | |
US4132260A (en) | Method and apparatus for hardening of foundry cores | |
US4123414A (en) | Method of manufacturing reinforced phenol resin articles, and products thus obtained | |
US5971056A (en) | Device for hardening foundry cores and use thereof | |
EP0986442B1 (en) | Method and apparatus for supplying an optimised quantity of catalyst to a core shooting machine | |
MXPA99007613A (en) | Method for the manufacture of cores for metal casting processes | |
CA1215509A (en) | Method and apparatus for casting around metal bodies | |
CN1606478A (en) | Method and device for hardening foundry cores | |
US6071985A (en) | Catalytic curing agent for resins and method for making the same | |
MXPA99011208A (en) | Method and apparatus for supplying an optimised quantity of catalyst to a core shooting machine | |
CA1073873A (en) | Method of introducing reaction mixtures for single-component foams into pressure containers | |
RU2005731C1 (en) | Process for manufacture of insulating polymer concrete material | |
US20080217801A1 (en) | Apparatus for forming aggregate composite forms | |
CN1165396C (en) | Device for hardening foundry cores | |
FR2376696A1 (en) | Vaporiser for hardening organic binder in foundry sand mixt. - using liq. amine catalyst which is evaporated by vacuum in the core-box | |
JPH0552840A (en) | Method for measuring carbonating degree of concrete building material | |
JPH0347647A (en) | Continuous production of sand mold for casting | |
JPS56163055A (en) | Resin-coated sand grain for shell mold |
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: 19990816 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 20010308 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: LI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20020116 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: CH Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020116 |
|
REF | Corresponds to: |
Ref document number: 211954 Country of ref document: AT Date of ref document: 20020215 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020204 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020204 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 69803170 Country of ref document: DE Date of ref document: 20020221 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020416 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020416 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020416 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020416 |
|
ET | Fr: translation filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020730 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020901 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020903 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20020416 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20110504 Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20121031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120229 |