DK153527B - PROCEDURE FOR THE CUTTING OF CASTING SUBSTANCES OF SILICONE BOND FORM SAND, WHICH SHOULD CONTAIN SUBSTANCES - Google Patents
PROCEDURE FOR THE CUTTING OF CASTING SUBSTANCES OF SILICONE BOND FORM SAND, WHICH SHOULD CONTAIN SUBSTANCES Download PDFInfo
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- DK153527B DK153527B DK292876AA DK292876A DK153527B DK 153527 B DK153527 B DK 153527B DK 292876A A DK292876A A DK 292876AA DK 292876 A DK292876 A DK 292876A DK 153527 B DK153527 B DK 153527B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/002—Removing cores by leaching, washing or dissolving
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Description
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Den foreliggende opfindelse angår en fremgangsmåde til nedbrydning af støbeforme indeholdende støbegods, hvilke forme består af silikatbundet formsandmasse.BACKGROUND OF THE INVENTION The present invention relates to a process for breaking down molds containing castings, which are silicate bonded mold sand pulp.
5 Ved fremstillingen af forme og kerner til støbning af metalliske materialer, såsom støbejern, støbestål, letmetaller, bronzer, etc. anvendes ofte en formmasse indeholdende sand og et si li katbinde-middel, almindeligvis vandglas. Silikatet kan hærdes, bl.a. ved anvendelse af en organisk ester, som f.eks. triacetin, der indblan-10 des i formmassen, eller med kuldioxid, som ledes igennem de fremstillede kerner eller forme. Hærdningen sker under udfældning af kiselsyregel, som binder sandkornene sammen, og foregår som regel ved stuetemperatur. Ved anvendelse af esterhærdning sammenblandes normalt først sand og ester, hvorefter silikatet tilføres blandingen 15 af sand og ester. Umiddelbart efter indblandingen af silikatet formes formmassen. Modellen kan som regel tages ud efter 15-30 min, hvorimod støbning først er mulig efter nogle timer.In the manufacture of molds and cores for casting metallic materials, such as cast iron, cast steel, light metals, bronzes, etc., a molding composition containing sand and a sieve of cat binder is often used, usually water glass. The silicate can be cured, i.a. using an organic ester such as e.g. triacetin, which is admixed into the mold, or with carbon dioxide passed through the cores or molds produced. The curing occurs during the precipitation of silica gel, which binds the grains of sand together, and usually takes place at room temperature. When using ester curing, sand and ester are usually first mixed together, after which the silicate is added to the mixture of sand and ester. Immediately after mixing the silicate, the molding mass is formed. The model can usually be removed after 15-30 minutes, while casting is only possible after a few hours.
Et almindeligt erkendt problem med silikatbundne formmasser er deres 20 manglende evne til at sønderdeles, hvilket nødvendiggør en besværlig udslagning af den hærdede formmasse ad mekanisk vej, f.eks. med vibrator eller endog med hammer, for at frigøre den støbte genstand.A commonly recognized problem with silicate bonded molds is their inability to decompose, which necessitates a cumbersome erosion of the cured molding by mechanical means, e.g. with a vibrator or even with a hammer, to release the molded object.
Udslagningen er et hårdt manuelt arbejde i et støvet og støjende miljø. Formresterne, der består af silikatbundne sandklumper af 25 varierende størrelse samt armeringsjern, transporteres bort til deponering på en losseplads eller underkastes regenerering i et særligt anlæg.The knockout is a hard manual work in a dusty and noisy environment. The mold residues, consisting of silicate-bound sand lumps of 25 varying sizes as well as reinforcing iron, are transported to landfill at a landfill or subjected to regeneration in a special facility.
Det er kendt, at de silikatbundne formmassers evne til sønderdeling 30 kan forbedres ved tilsætning af forskellige organiske stoffer til formmassen, såsom sukker, dextrin, stivelse, træmel og kulmel. Denne forbedring af sønderdelingsegenskaberne, som kan opnås gennem de nævnte tilsætninger, løser imidlertid langt fra udslagningsproble-met. Man er, selv ved anvendelsen af tilsætningerne, tvunget til at 35 gribe til mekaniske metoder.It is known that the ability of the silicate bound molds to decompose 30 can be enhanced by the addition of various organic substances to the molding material such as sugar, dextrin, starch, wood flour and charcoal flour. However, this improvement in the decomposition properties which can be obtained through the said additions solves far from the extinction problem. Even with the use of the additives, one has to resort to mechanical methods.
Fra GB patentskrift nr. 1.211.824 kendes endvidere en fremgangsmåde til fjernelse af keramiske kerner fra støbegods. Fjernelsen foregår ved opløsning a selve det keramiske materiale. Til denne opgave 2 p ! S ' ? r o 17 r~, la i do / 3 kræves der stærke alkaliske opløsninger med høj temperatur, lang behandlingstid og forhøjet tryk samt en cyklisk processuel behandling, der indbefatter kogning og kondensation. På side 2, andet afsnit og i eksemplet i patentskriftet angives således en 5 hydroxidkoncentration på 20-50% henholdsvis 20%, en temperatur for opløsningen på 135-168°C henholdsvis 149°C, et tryk på 4,1-6,1 atm. henholdsvis 5,1 atm. og en behandlingstid på 12 timer. Det er desuden ikke nævnt i dette patentskrift, at der foreligger nogen form for bindemidel mellem partiklerne i formmassen.GB-A-1,211,824 also discloses a method for removing ceramic cores from castings. The removal takes place by dissolving the ceramic material itself. For this task 2 p! S '? r o 17 r ~, la i do / 3 requires strong alkaline solutions with high temperature, long processing time and elevated pressure, as well as a cyclic process process including boiling and condensation. Thus, on page 2, second paragraph and in the example of the patent, a concentration of hydroxide of 20-50% and 20% respectively is given, a temperature of the solution of 135-168 ° C and 149 ° C respectively, a pressure of 4.1-6.1 atm. 5.1 atm, respectively. and a processing time of 12 hours. Furthermore, it is not mentioned in this patent that there is any kind of binder between the particles in the mold.
10 I tysk patentskrift nr. 364.227 beskrives en fjernelse af sand, der sidder hæftet til støbegods. Fjernelsen foregår ved behandling med smeltet natriumhydroxid eller med natronlud under tryk og under opløsning af sandet. Der er ikke nævnt noget om nedbrydning af selve 15 formmassen, og der er heller ikke nævnt noget om et bindemiddel i denne.10 German Patent No. 364,227 discloses a removal of sand attached to the castings. The removal takes place by treatment with molten sodium hydroxide or with soda liquor under pressure and under the solution of the sand. There is no mention of degradation of the mold itself, nor is there any mention of a binder in it.
Ingen af disse patentskrifter omhandler således en behandling af silikatbundet formsandmasse i en udstøbt form, hvorved bindemidlet i 20 formsandmassen opløses, støbegodset blotlægges, og formsandmassepart i kl erne frigøres fra hverandre.Thus, none of these patents discloses a treatment of silicate bonded mold sand pulp in an molded form, whereby the binder in the mold sand pulp is dissolved, the castings exposed and the mold sand pulp part of the adhesive released from each other.
Ifølge den foreliggende opfindelse har det ved udslagning af silikatbundet formmasse vist sig muligt at undgå besværlige mekaniske 25 metoder og dermed følgende ulemper. Udslagningen af formmassen og frigørelsen af støbegods af høj kvalitet kan derved lettes betydeligt. Fremgangsmåden ifølge den foreliggende opfindelse har desuden den fordel, at den ved enkle midler muliggør regenerering af sandkornene i den anvendte formmasse, således at disse atter kan anven-30 des ved fremstillingen af nye forme og kerner.According to the present invention, it has been found possible to avoid cumbersome mechanical methods and hence the following disadvantages when quenching silicate bonded pulp. The knock-out of the molding and the release of high-quality castings can thereby be considerably facilitated. In addition, the process of the present invention has the advantage of enabling, by simple means, the regeneration of the sand grains in the mold used, so that these can again be used in the preparation of new molds and cores.
Dette opnås med en fremgangsmåde til behandling af silikatbundet formsandmasse i udstøbt form, dvs. indeholdende støbegodset, evt. indeholdende kerne, til nedbrydning af formmassen, hvilken frem-35 gangsmåde ifølge opfindelsen er ejendommelig ved, at den udstøbte form udsættes for indvirkning af en alkalisk vandopløsning med en temperatur på højst 100°C til opløsning af silikatbindemidlet og frigørelse af sandkornene i formmassen, hvorefter de frigjorte formsandkorn eventuelt renses med vand og tørres.This is achieved by a method of treating silicate bonded mold sand pulp in molded form, i.e. containing the castings, possibly containing the core, for degrading the molding, the process of the invention being characterized in that the molded mold is subjected to the action of an alkaline water solution at a temperature not exceeding 100 ° C to dissolve the silicate binder and release the sand grains into the molding the released mold sand grains are optionally cleaned with water and dried.
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Den udstøbte form kan bl.a. udsættes for indvirkning af en alkalisk vandopløsning ved nedsænkning i et bad af opløsningen eller ved overhældning eller påsprøjtning med den alkaliske vandopløsning. Overhældning eller påsprøjtning medfører i mange tilfælde fordele 5 fremfor nedsænkning, idet man med de nævnte metoder kan fremkalde en successiv borttransport af den nedbrudte formmasse fra formens overflade, hvorved den underliggende formmasse bliver lettere tilgængelig for den alkaliske vandopløsning. Især ved udslagning af kerner kan sprøjtemetoden være værdifuld, da borttransporten af sand 10 normalt er vanskeligere fra kerner. Et passende tryk på vandopløsningen ved sprøjtning er 101-5.066 KPa. Hvis man samtidigt ønsker at efterlade en metallisk ren overflade på støbegodset, kan det blive nødvendigt at anvende et højere tryk, f.eks. 5.066-30.397 KPa. Af økonomiske grunde bør vandopløsningen, efter at den er blevet skilt 15 fra det frigjorte sand, recirkuleres til udslagningsanlægget for at blive anvendt ved overhældning eller påsprøjtning af nye udstøbte forme.The molded shape can include is exposed to the action of an alkaline aqueous solution by immersing in a bath of the solution or by pouring or spraying with the alkaline aqueous solution. In many cases, pouring or spraying gives advantages 5 over immersion, with the aforementioned methods being able to induce a successive removal of the degraded mold mass from the mold surface, thereby making the underlying mold mass more readily accessible to the alkaline water solution. Especially when casting cores, the spraying method can be valuable, since the transport of sand 10 is usually more difficult from cores. An appropriate pressure on the aqueous solution by spraying is 101-5.066 KPa. If, at the same time, one wishes to leave a metallically clean surface on the casting, a higher pressure may be required, e.g. 5.066-30.397 KPa. For economic reasons, after being separated from the released sand, the water solution should be recycled to the effluent to be used for pouring or spraying new molded molds.
Formen af silikatbundet formmasse kan være fremstillet på konven-20 tionel måde. Således kan formmassen være fremstillet af kvartssand, chromitsand, olivensand eller en anden inden for støbeteknikken anvendt sandtype. Som bindemiddel til sandet foretrækkes vandglas, selv om det er muligt at anvende andre vandopløselige silikater. Mængden af silikat, som tilsættes ved fremstillingen af formmassen, 25 udgør passende 0,5-5% af sandets vægt. Silikatet tilsættes normalt i form af en vandopløsning. I den ovenfor angivne mængde silikat er vandet ikke indregnet. Hærdningen kan ske på konventionel måde, idet dog hærdning med kuldioxid og med organisk ester er af særlig betydning, men hvor selv hærdning med andre i formmassen indgående 30 stoffer end organiske estere, såsom syrer, cement, dicalciumsil i kat og kisel, kan komme på tale. De estere, som oftest anvendes som hærdere, er blandinger åf diacetin (glyceryl di acetat) og triacetin (glyceryl tri acetat) eller blandinger af diacetin og ethyldiglycoldi acetat i forskellige vægtforhold afhængigt af de 35 ønskede hærdetider. De nævnte estere kan også anvendes hver for sig. Ligeledes er andre estere anvendelige, bl.a. acetater af glycol. Den mængde ester, som tilsættes sandet ved fremstillingen af formmassen, udgør passende 0,05-2% af sandets vægt. Ved fremstilling af en form med esterhærdning kan blandingen af komponenterne udføres f.eks. i 4The form of silicate bonded pulp may be made in conventional manner. Thus, the molding material may be made of quartz sand, chromite sand, olive sand or another type of sand used in the casting technique. As a binder for the sand, water glass is preferred, although it is possible to use other water-soluble silicates. The amount of silicate added in the preparation of the molding mass is suitably 0.5-5% of the weight of the sand. The silicate is usually added in the form of an aqueous solution. In the above amount of silicate, the water is not included. Curing can be done in a conventional manner, however, curing with carbon dioxide and with organic ester is of particular importance, but where even curing with other substances contained in the molding mass than organic esters such as acids, cement, dicalcium silk in cat and silicon can occur. talk. The esters most commonly used as hardeners are mixtures of diacetin (glyceryl di acetate) and triacetin (glyceryl tri acetate) or mixtures of diacetin and ethyl diglycoldi acetate in various weight ratios depending on the desired cure times. Said esters can also be used separately. Other esters are also useful, i.a. acetates of glycol. The amount of ester added to the sand in the preparation of the molding mass is suitably 0.05-2% of the weight of the sand. In preparing an ester curing mold, the mixing of the components can be carried out e.g. i 4
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en kontinuerlig snegleblander, idet, som tidligere nævnt, sand og ester normalt blandes, inden silikatet tilsættes. Formen kan bl.a. fremstilles ved, at formmassen efter sammenblandingen med silikatmassen løber ned over modellen under samtidig rystning eller pres-5 ning. Efter, at formen har fået lov at hærde i 15-30 min, kan modellen tages ud. Over- og underdel på formen sættes atter sammen efter yderligere nogle timers hærdning. Støbning udføres som regel tidligst efter 6 timer. Udstøbningen kan f.eks. ske over en bundudtømmende skakt. Eventuelt anvendte kerner kan fremstilles på ti 1 -10 svarende måde, hvis dette ønskes. Efter, at støbegodset er afkølet, behandles den udstøbte form i overensstemmelse med fremgangsmåden ifølge den foreliggende opfindelse med den alkaliske vandopløsning.a continuous auger mixer, as previously mentioned, sand and ester are usually mixed before the silicate is added. The shape can be is produced by the molding mass, after mixing with the silicate mass, running down the model during simultaneous shaking or pressing. After the mold has been allowed to harden for 15-30 minutes, the model can be removed. The top and bottom of the mold are reassembled after another few hours of curing. Casting is usually done at the earliest after 6 hours. The casting can e.g. happen over a bottom exhaustive shaft. Optionally used cores can be prepared in ten to ten corresponding ways if desired. After the castings have cooled, the molded mold is treated in accordance with the process of the present invention with the alkaline aqueous solution.
Den alkaliske vandopløsning fremstilles ved opløsning af 15 natriumhydroxid, kaliumhydroxid og/eller andet al kalimetal hydroxid og/eller ammoniak i vand. Også andre stoffer end de nævnte, som giver en vandopløsning med tilstrækkelig høj alkalitet, kan naturligvis anvendes. Vandopløsningens pH-værdi er passende mindst 12 men fortrinsvis mindst 13. Ved anvendelse af al kali hydroxid bør mængden 20 af al kali hydroxid være mindst 0,4%, passende 0,4-20% men fortrinsvis 0,4-10%, af den samlede vægt af hydroxid og vand for at opnå den ønskede alkalitet. Ved anvendelse af ammoniak foretrækkes en mængde på 10-30% af den samlede vægtmængde af ammoniak og vand.The alkaline aqueous solution is prepared by dissolving sodium hydroxide, potassium hydroxide and / or other all potassium metal hydroxide and / or ammonia in water. Naturally, substances other than those which provide a water solution of sufficiently high alkalinity can also be used. The pH of the aqueous solution is suitably at least 12 but preferably at least 13. When using all potassium hydroxide, the amount of 20 of all potassium hydroxide should be at least 0.4%, suitably 0.4-20% but preferably 0.4-10%, of the total weight of hydroxide and water to obtain the desired alkalinity. When using ammonia, an amount of 10-30% of the total weight amount of ammonia and water is preferred.
25 En forøgelse af vandopløsningens temperatur forbedrer sønderdelingen væsentligt. Specielt, hvis det er et problem at nedbryde den formmasse, som ligger nær ved støbegodset, og som derfor udsættes for mest varme, kan det være af betydning at forøge vandopløsningens temperatur. Hvis et sådant problem foreligger, anbefales tillige 30 anvendelsen af et stort indhold af al kali hydroxid i vandopløsningen. Vandopløsningens temperatur er passende mindst 40°C og højst 100°C, fortrinsvis 50-80°C. Behandlingen sker normalt ved atmosfæretryk i et tidsrum på 1 min til 1 time.An increase in the temperature of the aqueous solution greatly improves the decomposition. Particularly, if it is a problem to break down the molding material which is close to the casting and which is therefore exposed to the most heat, it may be important to increase the temperature of the water solution. If such a problem exists, the use of a high content of all potassium hydroxide in the aqueous solution is also recommended. Suitably, the temperature of the aqueous solution is at least 40 ° C and at most 100 ° C, preferably 50-80 ° C. Treatment is usually done at atmospheric pressure for a period of 1 minute to 1 hour.
35 Efter at støbegodset er frigjort fra formmassen, gøres det rent med vand, eksempelvis ved spuling eller skylning.35 After the casting is released from the molding, it is cleaned with water, for example by rinsing or rinsing.
Den nedbrudte formmasse i form af sand, der er forurenet med al kali hydroxid, kan efter rengøring bestående af gentagne skylninger 5 DK 153527ί med vand og efterfølgende tørring anvendes til fremstilling af ny formmasse, dvs. formmassen kan genanvendes. Ved anvendelse af esterhærdere iblandes som tidligere beskrevet først ester og derefter vandglas eller andet silikatbindemiddel i den rensede formmasse.The decomposed mold in the form of sand contaminated with all potassium hydroxide can, after cleaning consisting of repeated rinses with water and subsequent drying, be used to make new mold, ie. the molding material can be recycled. When using ester hardeners, as previously described, ester and then water glass or other silicate binder are first incorporated into the purified molding compound.
5 Denne er derefter klar til fremstilling af nye forme.5 This is then ready for making new molds.
I det følgende vil opfindelsen blive illustreret af eksemplerne 1-4, mens eksempel 5 belyser rensning af det nedbrudte formsand og genanvendelse af dette.In the following, the invention will be illustrated by Examples 1-4, while Example 5 illustrates purification of the degraded mold sand and its reuse.
1010
Eksempel 1Example 1
En formmasse fremstilles af kvartssand med en middel kornstørrelse på 0,25 mm. Sandet blandes først med 0,4 vægtprocent (regnet på sand-15 basis) af en esterhærder bestående af en blanding af lige dele diacetin og triacetin og derefter med 4 vægtprocent (regnet på sandbasis) vandglas indeholdende 40 vægtprocent silikat og 60 vægtprocent vand. Efter fremstilling af en blokform og udstøbning af støbestål på konventionel måde får den udstøbte form lov at afkøle, 20 indtil støbegodset har en temperatur på mellem 200-500°C. Den sænkes derefter ned i et 55-60°C varmt bad bestående af en 3% natriumhydroxidopløsning. Efter ca. 5 min er formmassen nedbrudt og støbegodset frigjort.A molding material is made of quartz sand with a mean grain size of 0.25 mm. The sand is first mixed with 0.4% by weight (calculated on a sandy basis) of an ester hardener consisting of a mixture of equal parts diacetin and triacetin and then with 4% by weight (calculated on a sandy basis) water glass containing 40% by weight of silicate and 60% by weight of water. After making a block mold and casting the cast steel in a conventional manner, the molded mold is allowed to cool until the casting has a temperature of between 200-500 ° C. It is then immersed in a 55-60 ° C hot bath consisting of a 3% sodium hydroxide solution. After approx. 5 minutes, the molding is broken down and the castings released.
25 Eksempel 2Example 2
En udstøbt form fremstilles som beskrevet i Eksempel 1. Denne overhældes derefter med en 55-60°C varm 3% natriumhydroxidopløsning.An molded mold is prepared as described in Example 1. This is then poured with a 55-60 ° C hot 3% sodium hydroxide solution.
Efter nogle minutters forløb er formmassen nedbrudt og støbegodset 30 frigjort.After a few minutes, the mold mass is broken down and the casting 30 is released.
Eksempel 3Example 3
En flaskeform fremstilles af samme formmasse som den i Eksempel 1 35 beskrevne. Den udstøbte form sænkes ned i et alkalisk bad af samme slags som det i Eksempel 1 angivne. Også i dette tilfælde nedbrydes formmassen, og støbegodset frigøres hurtigt. På grund af, at den udstøbte formmasse befinder sig i en flaske, tager nedbrydningen og frigørelsen dog noget længere tid sammenlignet med blokformen.A bottle mold is made from the same mold mass as that described in Example 1 35. The molded form is immersed in an alkaline bath of the same kind as in Example 1. In this case, too, the molding is degraded and the castings are released quickly. However, because the molded mold is in a bottle, the degradation and release takes a little longer compared to the block mold.
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66
Eksempel 4Example 4
En udstøbt flaskeform fremstilles på den i Eksempel 3 angivne måde.An molded bottle shape is prepared in the manner set forth in Example 3.
Den udstøbte form påsprøjtes en alkalisk vandopløsning af samme 5 slags som den i Eksempel 1 angivne og med et tryk på omkring 507 KPa. Også i dette tilfælde nedbrydes formmassen hurtigt, og støbegodset frigøres.The molded die is sprayed with an alkaline water solution of the same kind as that of Example 1 and at a pressure of about 507 KPa. In this case, too, the mold mass degrades quickly and the casting is released.
Eksempel 5 10Example 5 10
Den formmasse, der er blevet nedbrudt som beskrevet i et af eksemplerne 1-4, skylles ned i en beholder, som er fyldt med vand, og som kontinuerligt tilføres vand via en sprinkleranordning i beholderens bund. Ved den nævnte vandtilførsel fremkaldes turbulens i 15 vandet og dermed en kontinuerlig gennemstrømning af vandet. Vandet forlader beholderen via et overløb. Sandet renses på denne måde under sin passage gennem vandet. Formmassens mindste partikler forlader beholderen via overløbet. Behandlingen udføres således, at pH-værdien i vandet holdes under 10. Efter at rensningen er over-20 stået, tages sandet ud af beholderen og tørres i et sandtørringsanlæg. Det således regenererede sand blandes før genanvendelsen først med 0,4 vægtprocent (regnet på sandbasis) esterhærder bestående af lige dele diacetin og triacetin og derefter med 4 vægtprocent (regnet på sandbasis) vandglas indeholdende 40 vægtprocent silikat 25 og 60 vægtprocent vand. Formmassen påføres en model og får lov at hærde 20 min, hvorefter modellen udtages. Efter 8 timers hærdetid foretages udstøbningen, og efter afslagningen fremviser godset pæne overflader, og der findes ingen tendenser til indtrængning.The mold which has been degraded as described in one of Examples 1-4 is flushed into a container which is filled with water and which is continuously supplied with water via a sprinkler device in the bottom of the container. At the said water supply, turbulence is induced in the water and thus a continuous flow of water. The water leaves the container via an overflow. The sand is thus cleansed during its passage through the water. The smallest particles of the molding mass leave the container via the overflow. The treatment is carried out so that the pH in the water is kept below 10. After the cleaning is completed, the sand is taken out of the container and dried in a sand drying system. Prior to reuse, the thus-regenerated sand is first mixed with 0.4 weight percent (based on sand) ester hardener consisting of equal parts diacetin and triacetin and then with 4 weight percent (based on sand basis) water glass containing 40 weight percent silicate 25 and 60 weight percent water. The molding mass is applied to a model and allowed to harden for 20 minutes, after which the model is removed. After 8 hours of curing time, the casting is done and after the cut-off, the goods show nice surfaces, and there are no tendencies for penetration.
30 Fremgangsmåden ifølge den foreliggende opfindelse er anvendelig til udslagning af støbegods fra støbeforme af silikatbundne formsandmasser for alle slags støbegods, såsom støbejern, støbestål, letmetaller, bronzer, etc. Særligt store fordele opnås ifølge opfindelsen ved støbestål.The method of the present invention is applicable to the casting of castings from molds of silicate bonded sand molds for all kinds of castings, such as cast iron, cast steel, light metals, bronzes, etc. Particularly advantageous according to the invention are obtained by cast steel.
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Claims (8)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7507435 | 1975-06-30 | ||
| SE7507435A SE398829B (en) | 1975-06-30 | 1975-06-30 | KIT FOR KEEPING OUT OF THE SILICATE-BONDED MASS PASS |
| SE7512964 | 1975-11-18 | ||
| SE7512964A SE414601B (en) | 1975-11-18 | 1975-11-18 | SET FOR MOLDING OF THE SILICATE BOTTOM FORMASSA UR PAGJUTEN FORM |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK292876A DK292876A (en) | 1976-12-31 |
| DK153527B true DK153527B (en) | 1988-07-25 |
| DK153527C DK153527C (en) | 1988-11-28 |
Family
ID=26656629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK292876A DK153527C (en) | 1975-06-30 | 1976-06-29 | PROCEDURE FOR THE CUTTING OF CASTING SUBSTANCES OF SILICONE BOND FORM SAND, WHICH SHOULD CONTAIN SUBSTANCES |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS526338A (en) |
| CA (1) | CA1078131A (en) |
| DE (1) | DE2626224C2 (en) |
| DK (1) | DK153527C (en) |
| FI (1) | FI61648C (en) |
| FR (1) | FR2316024A1 (en) |
| GB (1) | GB1549220A (en) |
| NO (1) | NO142203C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114457A (en) * | 1979-02-27 | 1980-09-03 | Hitachi Ltd | Core removing method |
| DE3537351A1 (en) * | 1985-10-19 | 1987-04-23 | Thyssen Industrie | Method and device for removing a ceramic core from a cast element |
| US5678583A (en) * | 1995-05-22 | 1997-10-21 | Howmet Research Corporation | Removal of ceramic shell mold material from castings |
| US6241000B1 (en) * | 1995-06-07 | 2001-06-05 | Howmet Research Corporation | Method for removing cores from castings |
| US7216691B2 (en) | 2002-07-09 | 2007-05-15 | Alotech Ltd. Llc | Mold-removal casting method and apparatus |
| WO2004024357A1 (en) | 2002-09-11 | 2004-03-25 | Alotech Ltd. Llc. | Chemically bonded aggregate mold |
| EP1539398A1 (en) | 2002-09-20 | 2005-06-15 | Alotech Ltd. LLC | Lost pattern mold removal casting method and apparatus |
| US7121318B2 (en) | 2002-09-20 | 2006-10-17 | Alotech Ltd. Llc | Lost pattern mold removal casting method and apparatus |
| US8813357B2 (en) | 2010-10-06 | 2014-08-26 | GM Global Technology Operations LLC | Piston with bi-metallic dome |
| US8763247B2 (en) * | 2010-10-06 | 2014-07-01 | GM Global Technology Operations LLC | Diesel piston with bi-metallic dome |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE364227C (en) * | 1922-03-18 | 1922-11-18 | Fritz Wuest Dr | Process for cleaning castings |
| GB1211824A (en) * | 1968-07-18 | 1970-11-11 | Trw Inc | Improvements in or relating to the removal of siliceous cores from castings |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3044087A (en) * | 1959-11-17 | 1962-07-17 | Powers Alex | Apparatus for eliminating ceramic cores |
| US3698467A (en) * | 1971-01-04 | 1972-10-17 | United Aircraft Corp | Method of removing silaceous cores from nickel and cobalt superalloy castings |
-
1976
- 1976-06-11 DE DE2626224A patent/DE2626224C2/en not_active Expired
- 1976-06-24 FI FI761846A patent/FI61648C/en not_active IP Right Cessation
- 1976-06-28 CA CA255,890A patent/CA1078131A/en not_active Expired
- 1976-06-28 NO NO762234A patent/NO142203C/en unknown
- 1976-06-28 JP JP51076299A patent/JPS526338A/en active Pending
- 1976-06-29 GB GB26974/76A patent/GB1549220A/en not_active Expired
- 1976-06-29 DK DK292876A patent/DK153527C/en not_active IP Right Cessation
- 1976-06-30 FR FR7619880A patent/FR2316024A1/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE364227C (en) * | 1922-03-18 | 1922-11-18 | Fritz Wuest Dr | Process for cleaning castings |
| GB1211824A (en) * | 1968-07-18 | 1970-11-11 | Trw Inc | Improvements in or relating to the removal of siliceous cores from castings |
Also Published As
| Publication number | Publication date |
|---|---|
| NO762234L (en) | 1977-01-03 |
| DE2626224A1 (en) | 1977-02-03 |
| DK292876A (en) | 1976-12-31 |
| NO142203C (en) | 1980-07-16 |
| NO142203B (en) | 1980-04-08 |
| FR2316024A1 (en) | 1977-01-28 |
| DK153527C (en) | 1988-11-28 |
| FI61648B (en) | 1982-05-31 |
| DE2626224C2 (en) | 1985-01-03 |
| FR2316024B1 (en) | 1982-04-02 |
| JPS526338A (en) | 1977-01-18 |
| FI761846A (en) | 1976-12-31 |
| FI61648C (en) | 1982-09-10 |
| CA1078131A (en) | 1980-05-27 |
| GB1549220A (en) | 1979-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |