DK171196B1 - Method and apparatus for making a sub-mold for a mold - Google Patents
Method and apparatus for making a sub-mold for a mold Download PDFInfo
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- DK171196B1 DK171196B1 DK360679A DK360679A DK171196B1 DK 171196 B1 DK171196 B1 DK 171196B1 DK 360679 A DK360679 A DK 360679A DK 360679 A DK360679 A DK 360679A DK 171196 B1 DK171196 B1 DK 171196B1
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- sand
- pressure
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- mold
- air
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- 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
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- Casting Devices For Molds (AREA)
Description
DK 171196 B1DK 171196 B1
Opfindelsen angår en fremgangsmåde til fremstilling af en nedre formpart til en støbeform, og som omfatter, at der vertikalt forskydeligt i bundafsnittet af en nedre formkasse anbringes én med et antal lufthuller forsynet presseplade således, at de to dele tilsammen afgrænser et opadtil åbent sandkanuner, som i monteret tilstand lukkes c foroven af en nedadvendende model, hvorefter der via pressepladens lufthuller blæses trykluft gennem det i sandkammeret ifyldte sand for at komprimere og styrke dette.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method of producing a lower mold part for a mold, comprising placing a vertically slidable in the bottom section of a lower mold box one press plate provided with a plurality of air holes such that the two parts together define an upwardly open sand cannon which in the mounted state, c is closed at the top of a downward-sloping model, whereby compressed air is blown through the air holes of the press plate through the sand filled in the sand chamber to compress and strengthen it.
10 Denne fremgangsmåde har været forbundet med problemer ved fremstilling af over- og underformparter, især når der til dette formål anvendes dobbeltsidede modelbrædder. Når der anvendes et højt tryk til at fluidisere og føre formsandet ind i recesser, som er udformet i modelbrættet 15 eller i dette sammen med formkassen, kommer formsandet ikke til at sidde tilstrækkeligt godt fast på modelbrættet. Når sandet modsat fluidiseres under et lavt tyk, komprimerer sandet ikke tilstrækkeligt i nærheden af modelbrættet, og formen opnår derfor ikke en tilstrække- 20 lig stor styrke. Det har derfor hidtil været anset for umuligt på tilfredsstillende måde at fremstille en kompliceret underformpart samtidigt med en overformpart ved hjælp af ovennævnte fremgangsmåde.10 This approach has been associated with problems in manufacturing over and underform parts, especially when double-sided model boards are used for this purpose. When a high pressure is used to fluidize and guide the mold sand into recesses formed in the model board 15 or in it together with the mold box, the mold sand will not get stuck firmly to the model board. On the contrary, when the sand is fluidized under a low thickness, the sand does not compress sufficiently in the vicinity of the model board and therefore the mold does not achieve a sufficiently high strength. Therefore, it has hitherto been considered impossible to satisfactorily prepare a complicated subform part simultaneously with a subform part by the above method.
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Et forsøg på at afhjælpe disse ulemper er beskrevet i DE fremlæggelsesskrift nr. 2 403 199, hvor formsandet i et formkammer fluidiseres af en første luftstrøm med lavt tryk og dernæst af en anden luftstrøm med et højere tryk slynges op i det øvre rum, som er dannet af modellen og 30 selve formkassen, hvorved sandet imidlertid ikke er i stand til at trænge tilstrækkelig godt ind i og udfylde hulheder og fordybninger i modellen.An attempt to alleviate these drawbacks is described in DE Laid-Open Specification No. 2,403,199, wherein the molding sand in a mold chamber is fluidized by a first low-pressure air stream and then by a second higher-pressure air stream being swept into the upper space which is formed by the model and the shape box itself, however, the sand is not able to penetrate sufficiently well and fill voids and depressions in the model.
Det er formålet med opfindelsen at anvise en fremgangs-35 måde af den indledningsvis nævnte art, hvormed der bedre DK 171196 B1 2 end hidtil kendt kan fremstilles underformparter, som danner et fuldtstændigt aftryk af selv de fineste recesser i modellen, og som samtidigt er komprimeret til ønsket tæthed og styrke over hele formparten.SUMMARY OF THE INVENTION It is an object of the invention to provide a method of the kind mentioned in the introduction, by which better subform parts can be produced than hitherto known, which form a complete impression of even the finest recesses in the model, and which are simultaneously compressed to the desired density and strength over the entire mold part.
55
Dette opnås, idet fremgangsmåden ifølge opfindelsen er ejendommelig ved, at sandkammeret fyldes med ét til den ønskede formpart svarende, på forhånd fastlagt kvantum sand, at den nedadvendende model fastgøres ovenpå form-10 kassen, at der gennem pressepladens lufthuller indblæses en første luftstrøm med et tilstrækkeligt stort første tryk til at løfte sandet op med ringe hastighed til berøring med modellens overflade, at en anden luftstrøm dernæst blæses gennem lufthullerne med ét i forhold til det 15 første tryk så meget højere andet tryk, at sandet kompri-meres i nærheden af modellens overflade, at en tredie luftstrøm derefter blæses gennem lufthullerne med et tredie tryk, som er mindre end det andet tryk, men stort nok til at holde sandet svævende over pressepladen, 20 hvorefter denne samtidigt forskydes opefter med en sådan kraft, at det samlede sandkvantum færdigkomprimeres til ønsket tæthed overalt i formparten. Formparten kommer derved til at danne én til modellen nøjagtig komplementær form indtil selv de fineste detaljer, samtidigt med at 25 den opnår en tilstrækkelig stor tæthed og styrke til at holde til den efterfølgende støbeproces.This is achieved since the method according to the invention is characterized in that the sand chamber is filled with a quantity of sand corresponding to the desired mold part, predetermined the downward-sealing model is fixed on top of the mold box, that a first air flow with a a sufficiently large initial pressure to lift the sand at low velocity for contact with the model surface, that a second air flow is then blown through the air holes with one relative to the first pressure so much higher second pressure that the sand is compressed near the model surface, that a third air stream is then blown through the air holes with a third pressure less than the second pressure but large enough to keep the sand floating over the press plate, after which it is simultaneously displaced upwards with such force that the total sand quantity is compressed to the desired density anywhere in the mold part. The mold part will thereby form one complementary shape to the model until even the finest details, while obtaining a sufficiently high density and strength to withstand the subsequent casting process.
Opfindelsen angår også et apparatur til udøvelse af ovennævnte fremgangsmåde, og som omfatter en nedre formkasse 30 og én i dennes bundafsnit vertikalt forskydeligt anbragt presseplade, som er forsynet med et antal lufthuller og sammen med formkassen afgrænser et opadtil åbent sandkammer, samt en nedadvendende model, som i monteret tilstand lukker sandkammeret opadtil. Dette apparatur er ifølge 35 opfindelsen ejendommeligt ved, at pressepladens lufthuller via mindst én luftledning er forbundet med henholdsvis en første-, en anden- og tredie luftforsyning, som er DK 171196 B1 3 indrettet således, at de i rækkefølge kan tilføre pressepladens lufthuller en første luftstrøm med et tilstrækkeligt stort første tryk til med ringe hastighed at løfte sandet op til berøring med modellens overflade, en anden 5 luftstrøm med ét i forhold til det første tryk så meget højere andet tryk, at sandet komprimeres i nærheden af modellens overflade, en tredie luftstrøm med et tredie tryk, som er mindre end det andet tryk, men stort nok til at holde sandet svævende over pressepladen, hvorhos der 10 yderligere er indrettet et samtidigt med den tredie luftstrøm aktiverbart drivorgan, som herunder påvirker pressepladen med en så stor vertikalt virkende kraft, at pressepladen forskydes opefter og færdigkomprimerer det samlede sandkvantum til ønsket tæthed overalt i formpar-15 ten. Konstruktionen bliver herved særlig enkel og hensigtsmæssig.The invention also relates to an apparatus for carrying out the above-mentioned method, which comprises a lower mold box 30 and a vertically displaceable press plate, which is provided with a plurality of air holes and together with the mold box delimits an upwardly open sand chamber, and a downwardly facing model, which, when mounted, closes the sand chamber upwards. According to the invention, this apparatus is characterized in that the air holes of the press plate are connected via at least one air line to a first, a second and a third air supply, respectively, which are arranged so that they can sequentially supply the air holes of the press plate air flow with a sufficiently large initial pressure to raise the sand at low velocity to contact the model surface, another 5 air flow at one relative to the first pressure so much higher second pressure that the sand is compressed near the model surface, a third air flow having a third pressure less than the second pressure, but large enough to keep the sand floating over the press plate, a further actuating actuator simultaneously operable with the third air flow which further influences the press plate with such a large vertical acting force that the pressing plate be displaced upwards and compressed the total quantity of sand to the desired t eternity everywhere in the mold pair. The construction hereby becomes particularly simple and appropriate.
For at få sandet til at lægge sig tæt ind mod modellens overflade i selv de dybeste recesser i denne kan modellen 20 endvidere ifølge opfindelsen være forsynet med udluftningshuller, som især kan være koncentreret i modellens recesser.Furthermore, in order to cause the sand to adhere tightly to the surface of the model in even the deepest recesses therein, the model 20 may according to the invention be provided with vent holes, which may in particular be concentrated in the recesses of the model.
Ved en særlig hensigtsmæssig udførelsesform for apparatu-25 ret ifølge opfindelsen, kan dette omfatte én under formkassen anbragt opstillingsramme til fastgørelse af formkassen og til vertikalt forskydeligt at optage pressepladen, og denne kan være udformet som en lukket kasse, der omslutter ét med luftledningen forbundet hulrum, 30 hvorved lufthullerne er indrettet i kassens opadvendende væg.In a particularly convenient embodiment of the apparatus according to the invention, this may comprise a mounting frame arranged below the mold box for securing the mold box and for vertically displacing the pressing plate, and this may be designed as a closed box enclosing a cavity connected to the air conduit. , 30 whereby the air holes are arranged in the upwardly facing wall of the box.
Opfindelsen forklares nærmere nedenfor, idet der beskrives en foretrukken udførelsesform under henvisning til 35 tegningen, hvor DK 171196 B1 4 fig. 1 viser apparaturet ifølge opfindelsen i monteret tilstand med sandfyldt kammer, fig. 2 samme, men med sandet løftet op af en luftstrøm, 5 og fig. 3 samme, men hvor pressepladen yderligere er ført op til færdigkomprimering af sandet.The invention is explained in more detail below with reference to a preferred embodiment with reference to the drawing, in which FIG. 1 shows the apparatus according to the invention in a mounted state with sand-filled chamber; FIG. 2, but with the sand lifted by an air flow, 5 and fig. 3 the same, but where the press plate is further led to final compression of the sand.
10 Som vist har en opstillingsramme 1, som kan forskydes vertikalt ved hjælp af cylindre 2, en nedre åbning, hvori en presseplade 5 kan forskydes ved hjælp af en vertikalt forskydelig stempelstang 4. En pakning 5a tjener til at sikre en lufttæt pasning mellem pressepladen 5's periferi 15 og opstillingsrammen 1. Pressepladen 5 er udformet som en lukket kasse, der omslutter et hulrum 6. Til passage for gas gennem pressepladen 5 er der i dennes øvre væg indrettet et antal huller 7 og i dens nedre væg et hul 8.10 As shown, a mounting frame 1, which can be displaced vertically by cylinders 2, has a lower opening in which a pressing plate 5 can be displaced by a vertically displaceable piston rod 4. A gasket 5a serves to ensure an airtight fit between the pressing plate 5 periphery 15 and the mounting frame 1. The press plate 5 is formed as a closed box enclosing a cavity 6. For passage of gas through the press plate 5, a number of holes 7 are arranged in its upper wall and a hole 8 in its lower wall.
Dette hul 8 er via en fleksibel ledning 9 og en hoved-20 ledning 12 forbundet med en trykluftkilde. Hovedledningen 12 omfatter en aflukningsventil 10 og en strømreguleringsventil 11. En omløbsledning 13, som selv har en aflukningsventil 10a og en strømreguleringsventil 11a, er ført uden om ventilerne 10, 11. En yderligere omløbsled-25 ning 14, der tilsvarende har en aflukningsventil 10b og en strømreguleringsventil 11b, er igen ført uden om den første omløbsledning 13. Det nævnte rørarrangement er fortrinsvis af den art, der er vist i fig. 1. 1 2 3 4 5 6This hole 8 is connected to a compressed air source via a flexible conduit 9 and a main conduit 12. The main conduit 12 comprises a shut-off valve 10 and a flow control valve 11. A bypass line 13, which itself has a shut-off valve 10a and a flow control valve 11a, is bypassed the valves 10, 11. A further by-pass line 14 correspondingly has a shut-off valve 10b and a flow control valve 11b, is again passed around the first bypass line 13. Said pipe arrangement is preferably of the kind shown in FIG. 1. 1 2 3 4 5 6
Over opstillingsrammen 1 er der anbragt to rulletranspor 2 tører 15 med en så stor indbyrdes afstand, at rammen kan 3 passere mellem disse. Ved hjælp af disse transportører 15 4 kan en nedre formkasse 16 føres til og fra en position 5 over opstillingsrammen 1. På formkassen 16 er der anbragt 6 et dobbeltsidet modelbræt, der kan trækkes op af formkassen 16, som vist i figurerne. Modellen 17 eller denne i forbindelse med formkassen 16 kan have en hvilken som DK 171196 B1 5 helst kompliceret form, der i det viste tilfælde omfatter recesser 18 og 19, der er af den art, som vanskeligt lader sig fylde fuldt ud med formsand. Den viste model består af en nedre model og en øvre model, som er adskilt 5 af et kammer 20, som kommunikerer med ydersiden via snævre passager 21. Disse snævre passager 21 er placeret i modellens recesser, idet passagernes tæthed er størst i de af modellens dele, som har de dybeste recesser. I hver passage er der anbragt ikke viste udluftningspropper.Above the alignment frame 1, two roller conveyors 2 are arranged 15 spaced apart so that the frame 3 can pass between them. With the aid of these conveyors 15 4, a lower mold box 16 can be moved to and from a position 5 above the mounting frame 1. On the mold box 16 is placed a double-sided model board which can be pulled up by the mold box 16, as shown in the figures. The model 17 or this in connection with the mold box 16 can have any complicated shape, which in the case shown comprises recesses 18 and 19 which are difficult to fill with mold sand. The model shown consists of a lower model and an upper model separated by a chamber 20 which communicates with the outside via narrow passages 21. These narrow passages 21 are located in the recesses of the model, with the density of the passages being greatest in those of the model. parts that have the deepest recesses. No vent plugs are shown in each passage.
10 Når apparaturet er i drift, stilles strømreguleringsventilen 11 således, at den tilfører komprimeret luft eller gas gennem pressepladen 5 med en sådan hastighed, at formsandet 23 løftes langsomt. Dernæst stilles regule-15 ringsventilen 11a således, at den komprimerede luft tilføres med en tilstrækkelig stor hastighed til, at der som følge af den modstand, som tryktabene i sandet og passagerne 21 yder, opbygges et højt tryk i formsandet 23. Dernæst stilles reguleringsventilen 11b således, at der 20 tilføres luft med en sådan hastighed, at formsandet 23 forhindres i at falde ned.10 When the apparatus is in operation, the flow control valve 11 is set to supply compressed air or gas through the press plate 5 at such a rate that the mold sand 23 is lifted slowly. Next, the control valve 11a is set so that the compressed air is supplied at a sufficiently high speed that, due to the resistance provided by the pressure losses in the sand and the passages 21, a high pressure is built up in the mold sand 23. Next, the control valve 11b is set. so that 20 is supplied with air at such a rate that the mold sand 23 is prevented from falling.
Ovenpå modelbrættet 17 kan der monteres en øvre formkasse, en øvre opstillingsramme, og en øvre presseplade. Af 25 hensyn til tydeligheden er disse dele imidlertid udeladt af tegningen og beskrivelsen af denne. Apparaturets funktion vil derfor i det følgende blive beskrevet under forudsætning af, at der kun fremstilles en nedre sand-formpart.On top of the model board 17, an upper mold box, an upper mounting frame, and an upper press plate can be mounted. However, for reasons of clarity, these parts are omitted from the drawing and description thereof. The operation of the apparatus will therefore be described in the following, provided that only a lower sand mold part is produced.
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En nedre formkasse 16 føres ved hjælp af transportøren 15 til en position umiddelbart over opstillingsrammen 1. Dernæst placeres pressepladen 5 i opstillingsrammen 1, hvorefter cylindrene 2, 3 aktiveres således, at såvel op-35 stillingsrammen som pressepladen føres opefter. Denne opadgående bevægelse fortsættes fortrinsvis indtil, formkassen 16 lige netop er fri af rul let ranspor tørerne 15.A lower mold box 16 is moved by means of the conveyor 15 to a position immediately above the mounting frame 1. Next, the pressing plate 5 is placed in the mounting frame 1, after which the cylinders 2, 3 are actuated so that both the setting frame and the pressing plate are moved upwards. This upward movement is preferably continued until the mold box 16 is just free of roll lightly wipers 15.
DK 171196 B1 6DK 171196 B1 6
Dernæst tilføres det af rammen 1, pressepladen 5 og formkassen 16 afgrænsede kammer det nødvendige kvantum formsand 23 fra f.eks. en tragt (ikke vist), hvorefter model-brættet 17 lægges oven på den nedre formkasse 16. Dernæst 5 aktiveres cylindrene 2, 2 og 3 igennem for at presse formkassen 16 op mod modellen 17's underside, som vist i fig. 1. I det viste tilfælde har modelbrættet 17 en model på såvel oversiden som undersiden, således at der samtidigt med underparten kan fremstilles en overpart.Next, the chamber delimited by the frame 1, the pressing plate 5 and the mold box 16 provides the necessary quantity of mold sand 23 from e.g. a funnel (not shown), after which the model board 17 is laid on top of the lower mold box 16. Next 5, the cylinders 2, 2 and 3 are actuated to push the mold box 16 against the underside of the model 17, as shown in FIG. 1. In the case shown, the model board 17 has a model on both the upper side and the lower side, so that an upper part can be manufactured simultaneously with the lower part.
1010
Ventilen 10 holdes åben i tilstrækkelig lang tid til, at der via ledningen 9, tilførselshullet 8, kammeret 6 og luftudstrømningshullerne 7 kan strømme trykluft ind i formsandet 23. Denne trykluftsstrøm løfter formsandet 23 15 opefter med lav hastighed. Dette medfører, at formsandet 23 let strømmer ind i enhver reces, såsom recessen 18, der i bunden er forsynet med luftudstrømningshuller 21. Luften blæses dernæst ud via disse luftudstrømningshuller 21 og kammeret 20. Denne metode sikrer, at formsandet 20 støder kraftigt mod alle fremspring på modelbrættet 17 og derved tvinges ind i de modsvarende recesser uden at blive fast. Dette medfører, at formsandets tæthed i recesserne kan forøges.The valve 10 is kept open for a sufficient period of time to allow compressed air to flow into the mold sand 23 via the conduit 9, the supply hole 8, the chamber 6 and the air outlet holes 7. This compressed air stream lifts the mold sand 23 15 upwards at low speed. This causes the mold sand 23 to flow easily into any recess, such as the recess 18 provided at the bottom with air outflow holes 21. The air is then blown out through these air outflow holes 21 and the chamber 20. This method ensures that the mold sand 20 abuts strongly against all projections. on the model board 17, thereby being forced into the corresponding recesses without getting stuck. This means that the density of the mold sand in the recesses can be increased.
25 Dernæst lukkes ventilen 10, og ventilen 10a åbnes i et forudbestemt tidsrum. Derved strømmer der trykluft ad samme vej som før, men nu med henblik på at danne et højt tryk under formsandet 23. Dette forøger sandets tæthed i nærheden af modelbrættet 17's overflade, og gør sandet 30 fast. Dette operationstrin er vist i fig. 2.Next, valve 10 is closed and valve 10a is opened for a predetermined period of time. Thereby, compressed air flows in the same way as before, but now in order to form a high pressure under the mold sand 23. This increases the density of the sand near the surface of the model board 17, and makes the sand 30 firm. This operation step is shown in FIG. 2nd
Næste operationstrin er vist i fig. 3, hvor ventilen 10a er blevet lukket, ventilen 10b åbnet, og stempelstangen 4 skudt ud for at føre pressepladen 5 op mod formsandet 35 23's bund. Fortrinsvis forskydes pressepladen 5 nu yder ligere for at komprimere formsandet i sin helhed. Formsandet forhindres i dette operationstrin i at falde ned DK 171196 B1 7 ved at åbne for aflukningsventilen 10b, og denne tilstand bibeholdes, indtil pressepladen 5's virkning er påbegyndt. Den anden omløbsledning 14 med tilhørende ventiler kan udelades, hvis der ikke er risiko for, at formsandet 5 falder ned, når det først er løftet op.The next operation step is shown in FIG. 3, where the valve 10a has been closed, the valve 10b is opened and the piston rod 4 is extended to guide the pressing plate 5 against the bottom of the mold sand 35 23. Preferably, the pressing plate 5 now shifts evenly to compress the mold sand in its entirety. In this operation step, the mold sand is prevented from falling down by opening to the shut-off valve 10b, and this condition is maintained until the effect of the pressing plate 5 has begun. The second bypass line 14 and associated valves may be omitted if there is no risk of the mold sand 5 falling once it is lifted.
Denne mekaniske sammenpresning af det samlede sandkvantum ved hjælp af pressepladen 5 udføres primært for at komprimere den del af sandet, som ikke er blevet komprimeret 10 alene ved hjælp af trykluftens virkning. Den mekaniske sammenpresning har dog nogen indvirkning på de af trykluften højkomprimerede dele.This mechanical compression of the total quantity of sand by means of the pressing plate 5 is carried out primarily to compress the part of the sand which has not been compressed 10 solely by the action of the compressed air. However, the mechanical compression has some effect on the highly compressed parts of the compressed air.
Den nedre formpart er nu færdig, hvorefter cylindrene 2, 15 3 reverseres for at sænke opstillingsrammen 1 og presse pladen 5. Dernæst kan den nedre formpart 16 fjernes fra modelbrættet 17 og sænkes ned på rulletransportøren 15.The lower mold part is now finished, after which the cylinders 2, 15 3 are reversed to lower the mounting frame 1 and press the plate 5. Next, the lower mold part 16 can be removed from the model board 17 and lowered onto the roller conveyor 15.
Fjernelsen af formkassen kan finde sted, idet der via 20 passagerne 21 blæses trykluft ind over formsandet 23's overside. Til dette formål er passagerne 21 forbundet med omløbsledningen 14 ved hjælp af en yderligere rørledning 14a, samt en trevejshane 10c. Opstillingsrammen 1 og pressepladen 5 kan adskilles fra formkassen 16 efter at 25 være sænket et lille stykke.The removal of the mold box can take place as compressed air is blown in via the 20 passages 21 over the top surface of the mold sand 23. For this purpose, the passages 21 are connected to the bypass line 14 by means of an additional pipeline 14a, as well as a three-way tap 10c. The mounting frame 1 and the pressing plate 5 can be separated from the mold box 16 after lowering 25 a little.
Den nedre formkasse og sandformen i denne kan dernæst uden at blive vendt overføres til en anden position, hvor den kan samles med en øvre formpart, således at der 30 dannes en færdig form. Den øvre formpart kan som nævnt ovenfor være formet på modelbrættet 17, idet den nærmere beskrivelse af denne proces dog er udeladt. Efter at den nedre formkasse med sandformen er blevet fjernet fra det øvrige apparatur, kan der tilføres en ny, tom formkasse, 35 og denne proces kan gentages så mange gange, som ønsket.The lower mold box and the sand mold therein can then be transferred, without being turned over, to another position where it can be assembled with an upper mold part so that a finished mold is formed. As mentioned above, the upper mold part may be formed on the model board 17, however, the detailed description of this process is omitted. After the lower mold box with the sand mold has been removed from the other apparatus, a new, empty mold box can be added, 35 and this process can be repeated as many times as desired.
8 DK 171196 B18 DK 171196 B1
Selv om det foretrækkes, at pressepladen 5 presser sandet op i en formkasse, der kan fjernes, fra en opstillingsramme, kan der dog også hovedsageligt for at undgå brug af denne anvendes en formkasse, som består af et enkelt 5 stykke. Såfremt, der anvendes dette arrangement, vil det normalt være nødvendigt at fjerne den færdige sandform fra formkassen 16.However, while it is preferred that the pressing plate 5 presses the sand into a removable mold box from a mounting frame, however, mainly to avoid its use, a mold box consisting of a single 5 piece can also be used. If this arrangement is used, it will usually be necessary to remove the finished sand mold from the mold box 16.
Ovenfor er beskrevet en foretrukken udførelsesform for 10 fremgangsmåden og apparaturet ifølge opfindelsen, men denne udførelsesform kan dog modificeres på mange måder.A preferred embodiment of the method and apparatus of the invention is described above, but this embodiment can be modified in many ways.
Det er således uden betydning, om det er strømningshastigheden eller trykket af den trykluft, som blæses gennem pressepladen 5, der reguleres. Det er desuden heller ikke 15 nødvendigt at lukke ventilen 10 samtidigt med ventilen 10a, som beskrevet ovenfor.Thus, it is irrelevant whether the flow rate or pressure of the compressed air blown through the press plate 5 is controlled. Also, it is not necessary to close valve 10 simultaneously with valve 10a, as described above.
Fremgangsmåden og apparaturet ifølge opfindelsen er især nyttig til fremstilling af en nedre formpart under anven-20 delse af et dobbeltsidet modelbrædt. Den nedre formpart kan fremstilles og samles med en øvre formpart uden at blive vendt, og dette kan reducere eller eliminere beska-deligelser under håndteringen.The method and apparatus according to the invention are particularly useful for producing a lower molding part using a double-sided model board. The lower mold part can be manufactured and assembled with an upper mold part without being reversed, and this can reduce or eliminate damage during handling.
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Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP5662579 | 1978-05-08 | ||
JP5662579A JPS55147462A (en) | 1979-05-08 | 1979-05-08 | Molding method of lower mold and squeeze plate device |
Publications (2)
Publication Number | Publication Date |
---|---|
DK360679A DK360679A (en) | 1980-11-09 |
DK171196B1 true DK171196B1 (en) | 1996-07-22 |
Family
ID=13032469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK360679A DK171196B1 (en) | 1979-05-08 | 1979-08-29 | Method and apparatus for making a sub-mold for a mold |
Country Status (13)
Country | Link |
---|---|
JP (1) | JPS55147462A (en) |
AU (1) | AU514819B2 (en) |
BR (1) | BR7905523A (en) |
CA (1) | CA1127823A (en) |
CH (1) | CH644537A5 (en) |
DE (1) | DE2933869C2 (en) |
DK (1) | DK171196B1 (en) |
FR (1) | FR2455937A1 (en) |
GB (1) | GB2048142B (en) |
IT (1) | IT1162654B (en) |
PH (1) | PH18462A (en) |
SE (1) | SE438802B (en) |
ZA (1) | ZA794559B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982003348A1 (en) * | 1981-04-02 | 1982-10-14 | Koebel Alfons | Method and device for pneumatically compacting molding sand |
DE3149172A1 (en) * | 1981-12-11 | 1983-06-30 | Georg Fischer AG, 8201 Schaffhausen | "METHOD FOR PRODUCING MOLDED BODIES USING GAS PRESSURE" |
CH666426A5 (en) * | 1984-06-25 | 1988-07-29 | Fischer Ag Georg | MOLDING PLANT. |
CH672270A5 (en) * | 1986-12-17 | 1989-11-15 | Fischer Ag Georg | |
DE3717558C3 (en) * | 1987-05-25 | 1997-04-03 | Kuenkel Wagner Prozesstechnolo | Process for making sand molds of models |
DE3836876C2 (en) * | 1988-10-29 | 1994-06-09 | Badische Maschf Gmbh | Method and device for compacting foundry molding material |
CH682547A5 (en) * | 1990-04-20 | 1993-10-15 | Fischer Ag Georg | Method and apparatus for compressing granular molding materials. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2798266A (en) * | 1953-08-03 | 1957-07-09 | Fed Foundry Supply Co | Core and mold blowing method and apparatus |
CH316854A (en) * | 1953-12-29 | 1956-10-31 | Fischer Ag Georg | Sand blow molding machine |
FR1355868A (en) * | 1962-03-23 | 1964-03-20 | Device in the form of a machine or machine head, for obtaining foundry molds and cores and other parts molded into a molding mass, by use of compressed air, in particular with projection of sand | |
US3293703A (en) * | 1962-11-13 | 1966-12-27 | Arthur R Taccone | Vacuum molding apparatus |
US3688830A (en) * | 1969-08-28 | 1972-09-05 | Elizabeth F Thompson | Method of making molds |
IT1008749B (en) * | 1973-01-29 | 1976-11-30 | Buehler Eugen | PROCEDURE AND DEVICE FOR THE PREPARATION OF SHAPES IN EARTH SAND |
DE2361820C3 (en) * | 1973-01-29 | 1975-07-03 | Eugen Dipl.-Ing. 8871 Burtenbach Buehler | Method and device for the further transport of a molding strand formed from horizontally divided boxless casting molds along a casting and cooling section |
FR2242177A1 (en) * | 1973-08-31 | 1975-03-28 | Figueras Michel | Sand moulds and cores mfr using the cold-box process - with initial injection of air into shooter chamber before main shot |
DE7602966U1 (en) * | 1976-02-03 | 1976-06-24 | Badische Maschinenfabrik Gmbh, 7500 Karlsruhe | FOUNDRY MOLDING MACHINE FOR BOX MOLDS |
DE2727297C3 (en) * | 1976-06-25 | 1980-07-10 | Georg Fischer Ag, Schaffhausen (Schweiz) | Method and device for producing foundry sand molds |
-
1979
- 1979-05-08 JP JP5662579A patent/JPS55147462A/en active Pending
- 1979-08-17 AU AU50045/79A patent/AU514819B2/en not_active Ceased
- 1979-08-21 DE DE2933869A patent/DE2933869C2/en not_active Expired
- 1979-08-24 CH CH771079A patent/CH644537A5/en not_active IP Right Cessation
- 1979-08-28 PH PH22971A patent/PH18462A/en unknown
- 1979-08-28 BR BR7905523A patent/BR7905523A/en not_active IP Right Cessation
- 1979-08-28 SE SE7907154A patent/SE438802B/en not_active IP Right Cessation
- 1979-08-29 ZA ZA00794559A patent/ZA794559B/en unknown
- 1979-08-29 FR FR7921661A patent/FR2455937A1/en active Granted
- 1979-08-29 DK DK360679A patent/DK171196B1/en not_active IP Right Cessation
- 1979-08-29 CA CA334,658A patent/CA1127823A/en not_active Expired
- 1979-08-29 IT IT50120/79A patent/IT1162654B/en active
- 1979-08-30 GB GB7929995A patent/GB2048142B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BR7905523A (en) | 1981-03-04 |
AU514819B2 (en) | 1981-02-26 |
JPS55147462A (en) | 1980-11-17 |
IT1162654B (en) | 1987-04-01 |
CA1127823A (en) | 1982-07-20 |
SE438802B (en) | 1985-05-13 |
PH18462A (en) | 1985-07-18 |
FR2455937B1 (en) | 1984-01-13 |
GB2048142B (en) | 1983-05-25 |
DE2933869C2 (en) | 1986-02-27 |
SE7907154L (en) | 1980-11-09 |
ZA794559B (en) | 1980-08-27 |
AU5004579A (en) | 1980-11-13 |
CH644537A5 (en) | 1984-08-15 |
FR2455937A1 (en) | 1980-12-05 |
GB2048142A (en) | 1980-12-10 |
IT7950120A0 (en) | 1979-08-29 |
DK360679A (en) | 1980-11-09 |
DE2933869A1 (en) | 1980-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
B1 | Patent granted (law 1993) | ||
PBP | Patent lapsed |