CN101668601A - Cast metallic article - Google Patents
Cast metallic article Download PDFInfo
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- CN101668601A CN101668601A CN200880008086A CN200880008086A CN101668601A CN 101668601 A CN101668601 A CN 101668601A CN 200880008086 A CN200880008086 A CN 200880008086A CN 200880008086 A CN200880008086 A CN 200880008086A CN 101668601 A CN101668601 A CN 101668601A
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- mould
- metallic article
- casting cavity
- cast metallic
- metal
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
Abstract
A kind of in mould the method for cast metallic article, be included in the moulding box (202) that microparticle material (208) are housed and set up mould (209).In casting cavity (103), place the metal (406) of packing in the crucible (122) in described moulding box and the chamber.After described moulding box and described crucible are located in described chamber, vacuum exhaust in described chamber.Metal in the crucible is heated and melts, and before or after fusing, non-oxygen gas is injected into casting cavity.Adopt vavuum pump to directly act on described moulding box, flow to into described mould, under non-oxygen gas environment, enter described mould then from described crucible perfusion deposite metal with auxiliary molten metal.
Description
MULTIPLE-BLADE
The application requires the number of patent application of the United Kingdom: 0721063.6, and the applying date is the preference on October 26th, 2007, its whole content is integrated at this.
Technical field
The present invention relates to be used for the device of mould metal casting and in mould the method for casting object.
Background technology
As can be known, comprise two waterwaies in the vacuum induction melting unit in the contrive equipment of cast metallic article and the background technology of method.Primary barrel comprises smelting furnace, therein metal under vacuum by melting.When liquation was prepared perfusion, ceramic shell mould (ceramic shell mould) was heated to 1000 ℃ in advance and is positioned over thereafter also by in second chamber of vacuum exhaust.When the isostasy in two chambeies, the valve between the chamber is opened.Mould is sent to primary barrel and pours into molten metal.Mould is recycled to second chamber then, and the valve closing and second chamber provide and abut against air pressure.
Therefore, this method needs relatively costly equipment, comprising: have a pair of vacuum induction melting unit with two-chamber that valve that enough big size passes through with the permission mould separates; With the heater that is used to preheat ceramic shell.In addition, the vacuum induction melting unit must have vacuum pump apparatus, and it can make the very fast vacuum in second chamber to reduce the temperature loss of ceramic shell.Because this equipment and technology is expensive, when the potential casting manufacturing based on special steel and nickel in the whole world was considered to require, the two-chamber system was only applicable to less market share.
This vacuum induction melting unit of minority has the smelting capacity greater than 100 kilograms in the world.Because working ability and running cost, and produce huge ceramic shell difficulty, they must be 1000 ℃ of casting, and their application is can only application corresponding important in far away the occasion of cost in those weight of casting and security, for example in the part of spacecraft.
The method of foregoing description also has the problem of bad energy efficiency, and the first, owing to need preheat mould, and second owing to preheating the loss that transmits the heat that mould caused between stove and the casting cavity.
Need recognize equally, transmit ceramic shell mould,, between preheating apparatus and vacuum induction melting device, produce the transmission problem and needed suitable treatment facility when under 1000 ℃.
To mould also be proved to be difficulty preheating between stove and the casting cavity insulation, particularly to big pattern.In addition, because the increase of the size of mould, and the size in chamber is also with increasing to hold mould.For the power of pump, vacuum exhaust is come in the second big chamber smaller long time that will spend usually.Therefore, transmit time that mould spent usually owing to bigger chamber prolongs preheating between stove and elementary (casting) chamber.This further causes the difficulty that keeps the mould temperature between stove and casting cavity preheating.Certainly, the power of pump can increase, and transmitting keeping the speed of the second chamber vacuum exhaust on the application level and remain on to preheat between stove and casting cavity, but causes the increase of fund and operation cost like this.
Summary of the invention
According to a first aspect of the invention, the method that it provides cast metallic article in mould comprises step: (a) set up mould in the moulding box of microparticle material is housed; (b) in casting cavity, place described moulding box; (c) metal of in crucible, packing into; (d) after described moulding box and described crucible were located in described chamber, vacuum exhaust was to reduce the pressure in the described chamber in described chamber; (e) metal in the heating crucible is to melt described metal; (f1) after vacuum exhaust is finished in described chamber, inject non-carrier of oxygen and enter described casting cavity; (f2) adopt vavuum pump to directly act on described moulding box, flow to into described mould with auxiliary molten metal; (g) enter described mould, continue from described moulding box pump gas simultaneously from described crucible perfusion deposite metal.
Because moulding box is placed in the described casting cavity, with crucible together, before the metal in crucible was heated and melts, this process allowed the use of vacuum induction melting unit, single chamber.And, owing to transmitting in the chamber, mould before the chamber is by vacuum exhaust takes place, and it will be simple needing device and transfer approach.
Again, because whole process occurs in the independent chamber, the mould (about 1000 ℃) that there is no need to transmit a heat is by second chamber, to casting cavity.Therefore, big foundry goods can be by the method production.For the purpose that illustrates, " big foundry goods " is meant that processing back quality is at 100 kilograms or above foundry goods.
Preferably, when its when being cold, mould is placed in the casting cavity.For the purpose that illustrates, " cold " is defined as here between the temperature between ambient air temperature and 300 ℃.Because mould does not need heating (about 1000 ℃), firing equipment and treatment facility can be simplified, particularly to big foundry goods.In addition, energy cost and thermal losses are lowered.
Preferably, mould is not preheated before in step (g).Therefore, handling mould further simplifies.
According to a second aspect of the invention, provide a kind of in mould the method for cast metallic article, comprise step: (a) in the moulding box of microparticle material is housed, set up mould; (b) in casting cavity, place described moulding box; (c) metal of in crucible, packing into; (d) after described moulding box and described crucible were located in described chamber, vacuum exhaust was to reduce the pressure in the described chamber in described chamber; (e) metal in the heating crucible is to melt described metal; (f) after vacuum exhaust is finished in described chamber, inject non-carrier of oxygen and enter described casting cavity; (g) enter described mould from described crucible perfusion deposite metal.
According to a third aspect of the present invention, provide a kind of in mould the device of cast metallic article, comprising: casting cavity has (i) first interface, it is suitable for connecting gas by moulding and introduces non-carrier of oxygen with supply and enter casting cavity; (ii) second interface, it is suitable for connecting pumping unit to be used for from the casting cavity vacuum exhaust by moulding; (iii) pipe, it has the device that is mounted on the outer pumping unit of casting cavity and has low-pressure cavity device within the die device that is mounted in the casting cavity; Be used for melting the metal that is placed at the crucible in the described casting cavity with electric heater.
Description of drawings
What Fig. 1 showed is the generalized section that is used for the device 101 of cast metallic article;
The die device 201 that in casting device 101, uses that Fig. 2 shows;
The flow chart that is to use the device 101 cast metallic article methods among Fig. 1 that Fig. 3 shows;
What Fig. 4 showed is according to wanting the employed device 101 of point methods among Fig. 3;
The flow chart that provides the further details of preparing mould step 301 that Fig. 5 shows;
What Fig. 6 showed is the husky die device 601 that is used in the device 101 that is used for cast metallic article; With
Fig. 7 shows is the husky die device 701 that is used in the device 101 of Fig. 1.
Preferred embodiment
Fig. 1
The device 101 that is used for cast metallic article is shown in the generalized section table.Device 101 comprises the housing 102 that has defined casting cavity 103.Housing 102 shown in Fig. 1 is installed on the casting ground 151.The inlet port in chamber 103 provides by the crucible door 105 on the wall of main door 104 and housing 102.So the workman, such foundry worker 152 can enter chamber 103 by main door 104.Main door 104 and crucible door 105 have been provided sealing 106, and when door was closed, as shown in Figure 1, the chamber was airtight by the air of essence like this.
In current example, enter gas and be used, but the gas that can predict herein can be replaced by other gas, nitrogen for example depends on the metal types of casting.
Should be noted that the word of usefulness " metal " is meant pure metal and metal alloy here.Therefore, metal can be an alloy, for example steel, stainless steel or nickel-base alloy.
Except interface 107 and 112, chamber 103 has independently manages 117, and it has the device that is mounted on the outer pumping unit of casting cavity and has the low-pressure cavity device that is mounted in the casting cavity.Therefore, in this example, pipe 117 has the pipe of flange 119 for having flange 118 and the opposite end in the chamber on the end outside chamber 103.Flange 118 in this example is connected on the pump installation 125 by second Vacuum exhaust tube 120.Vacuum exhaust tube also provides solenoid actuator valve 121 with the pump gas of control by pipe 117.The flange 119 that is installed in the chamber 103 allows pipe 117 to be connected on the low-pressure cavity, and himself places among the casting cavity 103 in the course of the work.This will further describe among Fig. 4 below.
In the present embodiment, the outlet of pump installation 125 is connected on the accessing port 127 of casting cavity 103 by tube apparatus 126.Therefore, in operation, be recycled into again in the chamber 103 by the gas of managing 117 vacuum exhausts.For gas circulation enters chamber 103 to keep relative drying, pump installation 125 comprises roots blower (roots blower).
This device comprises the induction melting unit with load coil 123, and it is installed in the chamber 103, is connected on the suitable power supply as known in the art (not looking out).Be provided at the device that supports crucible 122 in the load coil 123, make like this to place the metal in the crucible to be melted by the affected of induction melting unit.
Load coil is fixed on high position, makes them can be installed on the floor in chamber 103 to form the space that mould can be installed like this.
In the embodiment that replaces, the induction melting unit is substituted by optional electric heater, and for example vacuum arc remelting furnace (vacuum arc remelter) is used for smelting metal in crucible.
Fig. 2
The die device 201 that in casting device 101 as shown in Figure 2, uses.
Die device comprises moulding box 202, and it has continuous in base plate 204 upwardly extending walls 203.Gas panelling 205 thoroughly is fixed in the case 202, makes it extend and parallel base plate 204 between wall around chest.Therefore, panelling 205, base plate 204 and wall 203 have defined low-pressure cavity 206.On one of them of wall 203, be provided with outgoing interface 207 for low-pressure cavity 206.
Panelling 205 is supporting microparticle material 208, for example sand, and ceramic shell mould (ceramicshell mould), and for example mould 209, are placed among the microparticle material.
Panelling 205 in this example is by the mesh screen moulding.The aperture that mesh screen limits has enough little size preventing passing through of microparticle material, and the passing through of permission gas.
Die device 201 provides wheel or the roller 212 that is installed under the base plate 204, with convenient turnover in casting cavity 103 in use.
In interchangeable embodiment, not that the microparticle material of sand is used in around the ceramic shell mould.These microparticle materials comprise malachite (molochite).
In interchangeable embodiment, impermeable membrane is omitted from the upper surface of sand.
Fig. 3 and 4
Adopt the method for device 101 cast metallic article among Fig. 1, as the flow chart of Fig. 3, and the device 101 that adopts according to method shown in Figure 4.
The first step 301 of method is to prepare suitable die device to be used to receive molten metal with mould casting, for example as shown in Figure 2.Preparing the step 201 of mould describes in detail with reference to Fig. 5.
Die device 201 comprises mould 209, and is positioned in step 302 in the casting cavity 103, for example by main door 104.The outlet 207 of low-pressure cavity 206 is connecting manages 117 flange 119, for example by flexible vacuum hose 401.
In step 303, the crucible 122 in casting cavity 103 is loaded onto metal 406, and it will be melted and be filled in the mould 209.Crucible 122 can be mounted by crucible door 105.
It should be noted that step 302 and 303 can arbitrary order operation.In other words, crucible can be installed before mould is placed into casting cavity.
In step 304, chamber door (104 and 105) is sealed, and valve 116 is opened and made gas pump to form vacuum from casting cavity 103.Typically, at next step line operate (step 205) that advances, chamber 103 be pumped out gas up to the chamber internal gas pressure less than 1x10
-1Mbar (the every square meter of 10 newton).
When casting cavity 103 obtained enough low pressure, induction heating apparatus 123 was activated, so that the metal 406 in the crucible 122 melts in step 205.For guaranteeing that metal flows into all parts of mould, particularly has the place of little passage, on the fusing point of the heated metal temperature in step 205 place at metal at mould.When metal reaches temperature required, valve 116 is closed at step 306 place, makes that further the vacuum exhaust to the chamber is prevented from.Valve 111 is opened then with non-carrier of oxygen backfill chamber 103.For example, when the metal of casting was stainless steel, gas can be argon gas.
Gas is supplied in the chamber 103 when pressure reaches half to an atmospheric pressure (0.5 * 10
5To 1 * 10
5And be typically and reach 0.9 atmospheric pressure (0.9 * 10 the every square meter of newton),
5The every square meter of newton).Valve 121 is opened then in step 307, makes that the pressure in the low-pressure cavity 206 reduces, and typically reaches the value (about 6.7 * 10 of 500 millimetress of mercury
4The every square meter of newton), and non-carrier of oxygen by pumping unit 125 by extracting out in mould and the sand.
To moulding box and husky 208 intergranular pressure difference, the effect of formation is to pin the grains of sand together to improve the support force that sand offers mould 209 from casting cavity 103.And because the infiltrative restriction of shell mould, barometric gradient is passed shell wall and is formed, in the non-carrier of oxygen of the inside of the wall external pressure with relative low wall, sand side.This keep shell on the sand of rigidity so that further support to be provided.
Should be noted that, in the present embodiment, turn back in the casting cavity 103 by accessing port 127 by the gas that mould extracts by pumping unit 125.
In step 308, molten metal is filled in the mould then in the crucible 122.In perfusion, because gas passes through mould 209, microparticle material 208, low-pressure cavity 206 and pipe 117 are discharged, and partial vacuum forms in the space that mould does not fill up.Therefore, the pressure in the space that mould does not fill up becomes less than the gas pressure in the casting cavity 103, and this pressure differential helps molten metal to flow to the space of not filling up in the mould.
Should be noted that, impermeable membrane 210 stoped gas from the chamber 103 passing through to microparticle material 208 upper surfaces.Therefore, film 210 has stoped gas to pass the unnecessary loss of die device 201.
In traditional employing vacuum induction melting casting technique, perfusion is to finish under vacuum.Yet, in this example, be poured in atmospheric pressure or finish, and this has firm advantageous effects and has been avoided the yielding of foundry goods in making near under the atmospheric pressure.
After filling mould, valve 121 is closed the further vacuum exhaust with prevention gas in step 309, and valve 111 is also closed.Foundry goods is hardened in the oxygenless gas environment in chamber 103 then and is cooled off, and disadvantageous like this foundry goods oxidation has been avoided.When foundry goods enough cools off, gas advances valve 132 to be opened in step 310, reaches the level of ambient air pressure to allow pressure in the chamber 103.Door 104 opens and mould shifts out in casting cavity.Foundry goods can then shift out in mould.
It should be noted that in the present embodiment, molten metal is poured in not to be had in the preheated mould.Yet even the passage in the mould has narrow relatively size, the liquid of fusing can flow into all parts of mould before curing.This reason is, the pressure differential of telling about above formed between the pressure of argon gas body and the partial vacuum that forms in mould self.
In said method, metal melts under vacuum in step 305, and in step 306 time, non-carrier of oxygen allows to enter in the chamber 103.For some metals, this has the advantage of the degassing (de-gassing), when it melts under vacuum.Yet in interchangeable method, before step 305 metal was melted, chamber 103 was received in non-carrier of oxygen.This will become favourable, when not requiring removing process, perhaps when metal be when comprising the alloy of low relatively fusing point, aluminium for example, it is inclined to gasification and causes the composition of alloy in the foundry goods under vacuum state ill effect.
Should be understood that using the whole process of cold mould is to take place in independent chamber.Therefore, by vacuum exhaust with before the sensed firing equipment fusing of metal, mould is positioned in the chamber in the chamber.Accordingly, the operation of the mould in the chamber is simplified, and the employing of enough big pottery mould makes production have 1000 kilograms of quality or bigger very big foundry goods becomes possibility.
Fig. 5
The step 301 of preparing die device is shown in the flow chart of Fig. 5 in detail.In step 501, thin walled ceramic shell mould is produced.This is by injection or wax or expandable polymer, and for example polystyrene (polystyrene) enters and forms apperance in the mould.Under the situation of polystyrene, diameter polystyrene spheres is installed in Mo Nei and heating, makes their expand and fuses into one to form the firm structure of essence.
Apperance is assembled to form one mutually with running and feeding system then.This assembly applies a series of unified grey mud layer then, and it includes the mud of refractory material and binder, and grog (grog) also is used.Typically, for little foundry goods, 5 to 6 layers of grey mud layer is used and with this method drying, for big foundry goods, adopts 8 to 9 layers.By the apperance of wax or polystyrene moulding, before shell is burnt to a crisp, remove by fusing then, perhaps burn.
After the cooling, finished product shell mould can be cleaned and urge and deposit for future use.
Shell mould (example 209 as shown in Figure 2) is placed among moulding box (202) and the microparticle material, and for example sand (208) is placed in around it in step 102.Moulding box vibration in step 103 then is typically with 40-50 hertz and the skew of 0.045 millimeter root mean square (RMS (root mean square)) in 90 seconds cycle.Vibration causes sand to flow touching with shell joint closely, and makes that sand is compact to become high big density.Therefore, in casting technique further rapid, sand provides the support of essence to thin ceramic shell mould.(as mentioned above, in step 307, this support is further promoted by the pressure differential that the pressure that reduces in low-pressure cavity 206 forms.)。Die device 201 is prepared to use in device 101 then.
Typically, be adapted on the apperance with the shell that makes pottery at 5 to 9 layers grey mud layer.Therefore, ceramic shell is too thin so that can not self support in casting operation.Yet as mentioned above, in casting process, shell is supported by the sand of compactness.
Compare the ceramic shell of using in the traditional vacuum induction heating technology, the wall of the ceramic shell of relative thin makes shell reach enough gently to realize manual operation.In addition, thin shell has low relatively thermal capacity, makes it not need preheating just can use before casting.Therefore, manual operation is more convenient, because the shell that is cooled.
Light, cold shell also is convenient to cleaning and is kept clean, the shell of the phase counterweight and very hot traditional vacuum induction melting technology.This makes that inclusion obtains simplifying.
It should be noted that thin shell wall makes foundry goods shrink and cooling in freezing point in this method, and then, the expection that hot tear crack takes place reduced.
The cheap more and rapid processing of shell than heavy wall of the use in the also relative traditional vacuum induction melting technology of thin ceramic shell, and they make the logistics of whole casting operation be improved.
Fig. 6
A kind of method of replacing above-mentioned casting, ceramic shell mould is substituted by husky mould.Husky die device 601 is used in as the device among Fig. 1 101, with the metal objects among casting Fig. 6.
Husky die device 601 similar die devices 201, it comprises moulding box 602, it has continuous in base plate 604 upwardly extending walls 603.Gas-permeable panelling 605 is installed in and makes it extend between the wall of chest in the case 602 and parallel base plate 604.Therefore, panelling 605, base plate 604 and wall 603 define low-pressure cavity 606.For the outer outgoing interface 607 of low-pressure cavity 606 is located on one of them wall 603.
Moulding box self is by three part moulding: the low parts 622 that comprising low-pressure cavity 606; The intermediate member 623 that comprises the lower part of the sand 608 that defines mould; With the upper-part 624 on the top that holds described sand, separate by the lower part of parting line 625 with sand.Upper-part 624 is identical in essence with traditional husky moulding box with intermediate member 623.Yet intermediate member 623 and low parts 622 are processed to be sealed, so that the air pressure in low-pressure cavity 606 can reduce, thereby form vacuum on Sha Mo.
Mould is prepared according to the traditional mode of essence, therefore before the apperance that limits mould, gate system, rising head etc. are placed in intermediate member near the moulding box of parting line, and the intermediate member 623 of moulding box 602 sand of partly packing into.Before it also was filled sand, the upper-part 624 of case 602 placed on the intermediate member 623 then.Sand is compacted by vibration and/or other mechanical systems.Upper-part 624 is extracted out then, is replaced with before forming complete mould as shown in Figure 6 at upper-part, and apperance is taken out in the careful sub-sand then.
Gas impermeable membrane 631 is placed on the upper surface of granular material 608.Film 631 defines the aperture that enters in the mould, for example, allows molten metal to be perfused in the mould.Be similar to the film 210 among Fig. 2, in use, film 631 is being resisted 103 air-flows by the granular material upper surface from the chamber, to stop unnecessary gas loss.In the present embodiment, film 631 is by the plastic material moulding, but other the material that can keep out the temperature that is produced in the casting engineering also can use.
In the present embodiment, the sand that forms mould carries out premixed with binder, sodium metasilicate for example, but in the embodiment that replaces, organic bond, for example based on the binder of polyurethane phenolic aldehyde (phenolicurethane), alkalescent phenol resin (alkaline phenolic), the perhaps employing of furane resins (furan resin).Accordingly, the mould that is made into is relatively stable in the process that shifts apperance and casting.
The use of device 101 and husky die device 601 is similar to aforesaid device 101 with die device 201.Therefore, flow process 302 to 310 steps of the description in the accompanying drawing 3 are suitable equally.It should be noted that in casting process the molten metal that is fed into Sha Mo has heated in the sand binder in the adjacent layer to high temperature.This causes the evaporation of binder composition and/or chemistry weak, and produces a large amount of gas accordingly.Carry out if be poured under the vacuum condition, the gas of generation stops correct metal to flow in the mould strong diffusion.Also possible, the gas of diffusion reaches bigger spreading rate and destroys mould.This problem will worsen under the HT rate of mechanically actuated filling system more, and will be for example used in the present invention.Yet in the present embodiment, perfusion has or is operating near under the atmospheric gas shield, and the also a large amount of minimizing of other diffusions that is produced by binder accordingly.In addition, by the running of filling system 15, the gas of generation is extracted by sand 608 and low-pressure cavity 606, and therefore their effects in casting are further reduced.
In another replacement method that Fig. 6 describes, Sha Mo adopts the known method of making foundry goods in air to prepare.Sha Mo is positioned in the casting cavity 103 of device 101 then.Metal be loaded in the crucible 122 and the pressure of chamber vent gas in the chamber approximately less than 1 * 10
- 1Mbar (the every square meter of 10 newton).
When the pressure in the casting cavity 103 reached enough low, induction heating apparatus 103 was activated so that the metal in the crucible 122 is melted.When metal reaches required temperature, valve 116 is closed, so that the further exhaust in chamber obtains stoping.Valve 111 is opened then with covering and is gone into non-carrier of oxygen, for example argon gas in the chamber 103.
Provide gas to chamber 103 always, reach half to one atmospheric pressure (0.5 * 10 up to pressure limit
5To 1.0 * 10
5And be typically and reach 0.9 atmospheric pressure (0.9 * 10 the every square meter of newton),
5The every square meter of newton).Molten metal is perfused in Sha Mo then, and foundry goods is being placed air and before the mobile foundry goods in chamber, it is being cooled off.
The method of this replacement does not directly adopt vacuum action to moulding box in the process of perfusion metal, and is not used from moving of the inside of mould bubbing accordingly.Yet casting process essence is carried out under non-carrier of oxygen environment.
Fig. 7
In replaceable above-mentioned casting method further, ceramic shell mould is replaced by husky mould.Husky die device 701 is used, and device 101 inside in Fig. 1 are to cast metal objects shown in Figure 7.
The upper surface of husky mould 702, the embodiment of similar front provides impermeable air film 732.
The lower surface of husky film places on the microparticle material 703, and in operation, forms vacuum in chamber 206, and gas is extracted by its bulk material 704 with by microparticle material 703 by the vestibule of husky mould 702.
Except the preparation of die device, adopt the description that is equal to Fig. 3 of the process nature of apparatus for casting shown in Figure 7.
Claims (25)
1. the method for a cast metallic article in mould comprises that step is:
(a) in being housed, the moulding box of microparticle material sets up mould;
(b) in casting cavity, place described moulding box;
(c) metal of in crucible, packing into;
(d) after described moulding box and described crucible were located in described chamber, vacuum exhaust was to reduce the pressure in the described chamber in described chamber;
(e) metal in the heating crucible is to melt described metal;
(f1) after vacuum exhaust is finished in described chamber, inject non-carrier of oxygen and enter described casting cavity;
(f2) adopt vavuum pump to directly act on described moulding box, flow to into described mould with auxiliary molten metal; With
(g) enter described mould from described crucible perfusion deposite metal, continue from described moulding box pump gas simultaneously.
2. the method for a cast metallic article in mould comprises that step is:
(a) in being housed, the moulding box of microparticle material sets up mould;
(b) in casting cavity, place described moulding box;
(c) metal of in crucible, packing into;
(d) after described moulding box and described crucible were located in described chamber, vacuum exhaust was to reduce the pressure in the described chamber in described chamber;
(e) metal in the heating crucible is to melt described metal;
(f) after vacuum exhaust is finished in described chamber, inject non-carrier of oxygen and enter described casting cavity; With
(g) enter described mould from described crucible perfusion deposite metal.
3. as claimed in claim 1 or 2 in mould the method for cast metallic article, wherein when described mould cooling, described mould is positioned in the described casting cavity.
4. as claimed in claim 3 in mould the method for cast metallic article, wherein said mould is not preheated in that step (g) is preceding.
As in the claim 1 to 4 arbitrarily described in mould the method for cast metallic article, wherein said step (f) from non-carrier of oxygen to casting cavity that inject is preceding being operated of step (e).
As in the claim 1 to 4 arbitrarily described in mould the method for cast metallic article, be after step (e), to be operated wherein to the described step (f) that described casting cavity injects non-carrier of oxygen.
As in the claim 1 to 6 arbitrarily described in mould the method for cast metallic article, wherein said mould comprises ceramic shell.
As in the claim 1 to 7 arbitrarily described in mould the method for cast metallic article, wherein said mould comprises ceramic shell, and described ceramic shell surrounded by the microparticle material in the described case, so that be supported in the perfusion of described shell in step (g).
As in the claim 1 to 6 arbitrarily described in mould the method for cast metallic article, wherein said mould comprises bulk material and binder.
As in the claim 1 to 6 arbitrarily described in mould the method for cast metallic article, wherein said microparticle material comprises bulk material, and described mould comprises bulk material and binder.
11. as in the claim 1 to 10 arbitrarily described in mould the method for cast metallic article, wherein said method is included in before described casting cavity is removed described mould, and the step of the described metal cooling in the mould is provided.
12. as in the claim 1 to 11 arbitrarily described in mould the method for cast metallic article, wherein said metal comprises: iron and steel, nickel alloy, copper alloy or cobalt alloy.
13. as in the claim 1 to 12 arbitrarily described in mould the method for cast metallic article, wherein said metal is the alloy that contains aluminium.
14. as in the claim 1 to 13 arbitrarily described in mould the method for cast metallic article, wherein said metal is the alloy that contains titanium.
15. as in the claim 1 to 14 arbitrarily described in mould the method for cast metallic article, wherein said non-carrier of oxygen comprises inert gas.
16. as claim 1 or aforementioned quote claim 1 any described in mould the method for cast metallic article, wherein step (f2) comprises the step that pumps gas from the chamber, and described chamber is with using the moulding box that is installed in the pump installation outside the described casting cavity linked together.
17. as claimed in claim 16 in mould the method for cast metallic article, wherein said gas returns described casting cavity from described pump installation.
18. as claim 1 or aforementioned quote claim 1 any described in mould the method for cast metallic article, wherein said method is included in the step that the upper surface of microparticle material is installed impermeable membrane.
19. the method for cast metallic article in mould arbitrarily as previously mentioned, wherein non-carrier of oxygen are injected into described casting cavity to increase in the chamber pressure with between half or an atmospheric pressure (0.5 * 10
5To 1 * 10
5The every square meter of newton).
20. the device of a cast metallic article in mould comprises:
Casting cavity has (i) first interface, and it is suitable for connecting gas by moulding and enters casting cavity with the non-carrier of oxygen of supply introducing; (ii) second interface, it is suitable for connecting pumping unit to be used for from the casting cavity vacuum exhaust by moulding; (iii) pipe, it has the device that is mounted on the outer pumping unit of casting cavity and has low-pressure cavity device within the die device that is mounted in the casting cavity; Be used for melting the metal that is placed at the crucible in the described casting cavity with electric heater.
21. as claimed in claim 20 in mould the device of cast metallic article, wherein said device comprises and is connected to described first pump installation that is used for from second interface of casting cavity vacuum exhaust.
22. as claim 20 or 21 described in mould the device of cast metallic article, wherein said device comprises and connects described second pump installation that is used for from the pipe of low-pressure cavity vacuum exhaust that described low-pressure cavity is installed in the die device that is positioned in the described casting cavity.
23. as claimed in claim 22 in mould the device of cast metallic article, wherein said device comprises the accessing port of the outlet that connects described second pump installation, so that the gas that described vacuum is discharged is provided back described casting cavity.
24. as in the claim 20 to 23 arbitrarily described in mould the device of cast metallic article, wherein said device comprises the gas accessing port and cooperates valve to provide air-flow at described casting cavity with around between the atmosphere of described casting cavity.
25. as in the claim 20 to 24 arbitrarily described in mould the device of cast metallic article, wherein said electric heater unit comprises the induction melting unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0721063A GB2454010B (en) | 2007-10-26 | 2007-10-26 | Casting a metal object |
| GB0721063.6 | 2007-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101668601A true CN101668601A (en) | 2010-03-10 |
Family
ID=38830022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880008086A Pending CN101668601A (en) | 2007-10-26 | 2008-10-17 | Cast metallic article |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101668601A (en) |
| GB (1) | GB2454010B (en) |
| WO (1) | WO2009053675A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912170A (en) * | 2011-08-04 | 2013-02-06 | 深圳光启高等理工研究院 | Sound absorption material, and preparation method and preparation system thereof |
| CN105855521A (en) * | 2014-05-09 | 2016-08-17 | 重庆硕龙科技有限公司 | Method and device for gravity casting of light alloy |
| CN113953490A (en) * | 2021-10-25 | 2022-01-21 | 湖州南丰机械制造有限公司 | Flexible bottom blowing device for precision casting pouring |
| CN117226076A (en) * | 2023-11-16 | 2023-12-15 | 中国机械总院集团沈阳铸造研究所有限公司 | Compression solidification device and compression solidification method suitable for vacuum pouring casting |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10933464B2 (en) * | 2019-07-23 | 2021-03-02 | Cheng-Kuan Wu | Forging cast method using thin shell mold |
| JP6915206B2 (en) * | 2019-08-26 | 2021-08-04 | 呉政寛 | Molten forging method for thin-walled shell molds |
| CN112877583B (en) * | 2021-02-10 | 2023-10-03 | 西格马(河南)高温科技集团有限公司 | Production system and production method of metal-based composite ceramic steel ball |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8301616D0 (en) * | 1983-01-21 | 1983-02-23 | Steel Castings Res | Ceramic shell moulds |
| JPH0259168A (en) * | 1988-08-25 | 1990-02-28 | Reiichi Okuda | Precision casting method |
| JP2912940B2 (en) * | 1990-05-18 | 1999-06-28 | 株式会社ジーシー | Dental metal casting method |
| US5226946A (en) * | 1992-05-29 | 1993-07-13 | Howmet Corporation | Vacuum melting/casting method to reduce inclusions |
| DE19639514C1 (en) * | 1996-09-26 | 1997-12-18 | Ald Vacuum Techn Gmbh | Production of high-precision centrifugal castings with controlled solidification |
| US6253828B1 (en) * | 1997-04-03 | 2001-07-03 | Shouzui Yasui | Method and casting device for precision casting |
| US6640877B2 (en) * | 1998-05-14 | 2003-11-04 | Howmet Research Corporation | Investment casting with improved melt filling |
| JP4125002B2 (en) * | 2001-12-14 | 2008-07-23 | 株式会社キャスティングオカモト | Mg casting method and apparatus |
| CA2496382A1 (en) * | 2002-08-20 | 2004-03-04 | Extrude Hone Corporation | Casting process and articles for performing the same |
| DE10345937B4 (en) * | 2003-09-30 | 2008-02-14 | Ald Vacuum Technologies Ag | Device for investment casting of metals |
| JP4603840B2 (en) * | 2004-09-14 | 2010-12-22 | 株式会社三社電機製作所 | Method of preventing chamber moisture absorption and casting apparatus for casting apparatus |
-
2007
- 2007-10-26 GB GB0721063A patent/GB2454010B/en not_active Expired - Fee Related
-
2008
- 2008-10-17 WO PCT/GB2008/003529 patent/WO2009053675A1/en active Application Filing
- 2008-10-17 CN CN200880008086A patent/CN101668601A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912170A (en) * | 2011-08-04 | 2013-02-06 | 深圳光启高等理工研究院 | Sound absorption material, and preparation method and preparation system thereof |
| CN105855521A (en) * | 2014-05-09 | 2016-08-17 | 重庆硕龙科技有限公司 | Method and device for gravity casting of light alloy |
| CN113953490A (en) * | 2021-10-25 | 2022-01-21 | 湖州南丰机械制造有限公司 | Flexible bottom blowing device for precision casting pouring |
| CN117226076A (en) * | 2023-11-16 | 2023-12-15 | 中国机械总院集团沈阳铸造研究所有限公司 | Compression solidification device and compression solidification method suitable for vacuum pouring casting |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009053675A1 (en) | 2009-04-30 |
| GB2454010B (en) | 2009-11-11 |
| GB2454010A (en) | 2009-04-29 |
| GB0721063D0 (en) | 2007-12-05 |
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Application publication date: 20100310 |