CN105492143A - Double casting method and apparatus - Google Patents
Double casting method and apparatus Download PDFInfo
- Publication number
- CN105492143A CN105492143A CN201480038602.4A CN201480038602A CN105492143A CN 105492143 A CN105492143 A CN 105492143A CN 201480038602 A CN201480038602 A CN 201480038602A CN 105492143 A CN105492143 A CN 105492143A
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- casting
- injection
- motlten metal
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- tube
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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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
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2023—Nozzles or shot sleeves
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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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
- B22D39/00—Equipment for supplying molten metal in rations
- B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The present invention relates to a double casting apparatus and a double casting method. The double casting apparatus comprises: a casting chamber having a space formed therein; an injection pipe provided at the lower portion of the casting chamber and injecting molten metal; a mold detachably connected to the injection pipe and having a cavity; a filling medium to be filled between the inside of the casting chamber and the mold; and a pressure control means placed at the upper portion of the casting chamber and reducing the internal pressure of the casting chamber.
Description
Technical field
The present invention relates to the method and apparatus for dual casting.More specifically, the present invention relates to such method and apparatus for dual casting, suction casting and gravitational casting are applied to mould by jointly, make like this to eliminate the pore in product and bubble, thus Ductile iron the problem solving lack of fill are to produce high-fire resistance steel casting easily.
Background technology
Normally used metal mould casting method is the most basic a kind of metal molding process, and for the identical product of a large amount of production profile.In casting method, iron filings, the pig iron, alloyed iron or nonferrous metal feed injection are entered smelting furnace, heating makes it melt, and is then poured in the mould formed by sand or metal material, and makes its cooled and solidified to manufacture a product.Its principle is, after motlten metal being injected into the mould manufacturing required form and profile, forms the metal object with same shape upon solidification of the molten metal.When completing Design of Dies, although casting makes it possible to produce product in a large number, but in the solidifying process (coagulationprocess) of foundry goods, often there is casting flaw, wherein, final products can comprise less desirable Non-metallic components (impurity) instead of metallics.In addition, the motlten metal injected by melting in an atmosphere is fusible and hydrogen, oxygen, nitrogen etc. that absorption is quite a large amount of, it reduce the solubility of solidificating period and produce bubble, and the portion gas do not discharged can retain and cause blemish.
Vacuum technique is used to prevent the casting method of this defect to be referred to as vacuum (decompression) casting method.When motlten metal to be contained in ladle (ladle) and under vacuum or cast in an atmosphere time, by carrying out in an atmosphere melting and carrying out casting or pass through processing under vacuum conditions the motlten metal that melts in an atmosphere under vacuum and use vacuum pressing and casting.
When using vacuum casting method, can be easy to remove pernicious gas composition, and the mechanical performance of product can become excellent.Therefore, this casting method is for the manufacture of products such as such as stainless steel, heat resisting steel, tool steel, bearing steel, magnetic materials.
Antigravity vacuum aided casting method is a kind of vacuum casting method, the exploitation such as HitchinerManufacturingCo. of the method in the seventies and the eighties by the U.S., and be a kind of by earthenware being inserted in motlten metal the method sucked by motlten metal rapidly via vacuum system in mould.No. 0947948th, Ebrean Registered Patent is cast the representative patents relevant with vacuum casting equipment with antigravity vacuum aided with No. 0801815.But, casting method due to the HitchinerManufacturingCo. described in this registered patent is limited to by ceramic die production hot investment casting product, therefore this casting method existence can cause much casting flaw (such as, be mixed with impurity) serious problems, because sand mo(u)ld cannot bear the motlten metal sucked rapidly, therefore by using sand mo(u)ld to carry out in the production cast, the problem of impurity mixing can be there is.In addition, this technology is that a kind of vacuum pressure that only utilizes is by sucking the method that product produced by mould by motlten metal, make so not only form fine pore rapidly and in the product due to molten metal flow in some cases but also form macropore (such as, worm channel (wormhole)), and in product local surfaces, there is the casting flaw of many lack of fills.
Particularly, rapidly motlten metal is packed into ceramic unit mould due to the vavuum pump in No. 0947948th, Ebrean Registered Patent need be used, the serious problems of burn failure may be there are in the sand mo(u)ld that therefore intensity is low, and when in cavity motlten metal being packed into mould and shell rotates with the rotating speed of 300RPM to 600RPM time, understand mold damage due to motlten metal or make die deformation, therefore the size of product may change, and serious mass defect can be caused, make like this to have to use the ceramic unit mould that price is high, this is disadvantageous in initial cost.In addition, because the ceramic unit mould for hot investment casting can not natual subside after motlten metal solidification, therefore ceramic unit mould not can be applicable to interpolation type product, such as turbine cylinder.
In addition, ceramic unit mould uses under 900 DEG C or higher temperature.Herein, because the temperature of mould is high, motlten metal needs to reach 600 seconds or the longer time before curing, and therefore, the productivity ratio of ceramic unit mould is seriously low.If moved moulds in the short period of time, motlten metal in vertical rising head (riser) then not only in No. 0947948th, Ebrean Registered Patent, and in the product being connected to cast gate, not solidified motlten metal also can be discharged from source, and cause serious quality problems.Therefore, as improving one's methods, after in cavity motlten metal being packed into mould, utilize centrifugal force that shell is rotated until product solidifies completely to attempt to boost productivity.But, still needed before product solidifies completely 300 seconds or the longer time.
In addition, in No. 0947948th, Ebrean Registered Patent, because shell rotates, therefore product mold is arranged that (product mold can become horizontal symmetrical in forward direction) is effective in a forward direction, this can cause the shape of product to be restricted.In addition, sentencing due to the middle body that ceramic unit mould need be arranged on shell and just equably centrifugal force is applied to whole product, being attached to the single ceramic unit mould of many cavity body of mould because being employed herein radial direction.
In addition, in the mould of hot investment casting, because injection-tube only can use once, and injection-tube is made up of the material identical with ceramic unit mould and is connected to ceramic unit mould, even if therefore upon solidification of the molten metal, mould also can not be separated, and therefore can reuse mould.
Due to these problems, HitchinerManufacturingCo. antigravity vacuum aided foundry engieering not commercialization in sand casting product, and up to the present, not yet there is the successful Application and Development of company in the whole world in the antigravity vacuum aided foundry engieering of the use suction line of sand casting product.
Therefore, in order to overcome the problems referred to above, the present inventor has carried out repeatedly studying to casting method, and remove sand mo(u)ld and vacuum pressure in non-ceramic precision casting mold by application and to be sucked by gravity but the dual foundry engieering of the motlten metal of ot-yet-hardened produces high temperature resistant heat resisting steel stainless steel product to recharge, thus complete the present invention.
Summary of the invention
Technical problem
One aspect of the present invention is to provide a kind of dual casting method that can prevent shrink defects, air blister defect and other casting flaw when cast article.
Another aspect of the present invention is to provide a kind of dual casting method, can remove the impurity comprised in the molten metal easily by this dual casting method.
Another aspect more of the present invention is to provide a kind of dual casting method, and this dual casting method precision is splendid and can manufacture complex-shaped product.
Another aspect of the present invention is to provide can the cost-saving and dual casting method boosted productivity.
Another aspect of the present invention is to provide dual Casting Equipment.
The solution of problem
One aspect of the present invention relates to a kind of dual Casting Equipment.This dual Casting Equipment comprises: casting chamber, forms a space segment in this casting chamber; Injection-tube, this injection-tube is arranged on below casting chamber, and motlten metal is injected in this injection-tube; Mould, this mould is connected to injection-tube removedly, and this mould has cavity; Filled media, this filled media is filled between the interior section of casting chamber and mould; And pressure-regulating device, this pressure-regulating device is arranged on above casting chamber, and this pressure-regulating device makes the interior section of casting chamber reduce pressure.
In one embodiment, also can comprise rising head, this rising head holds motlten metal by being communicated with the upper part of the cavity in mould, and motlten metal is disposed to cavity.
In one embodiment, the size of rising head can be formed as about 30 percents by volume of mould volume to about 120 percents by volume.
In one embodiment, also can comprise melting furnace, this melting furnace is used for melt raw material to form motlten metal.
In one embodiment, the internal diameter of injection-tube can be greater than the internal diameter of the entrance of cavity.
In one embodiment, the internal diameter of cavity and the ratio of the internal diameter of injection-tube can be about 1:1.1 to about 1:3.
In one embodiment, pressure-regulating device can comprise strum, vavuum pump and suction line.
Another aspect of the present invention relates to the dual casting method using dual Casting Equipment.This dual casting method comprises: the casting chamber's decompression making to be filled with filled media by pressure-regulating device, and is injected by the first time performed in the cavity be expelled to by motlten metal along injection-tube in mould with the pressure differential of outside; And first time the motlten metal be expelled in cavity solidify before cancel casting chamber decompression and by gravity perform motlten metal second time injection.
In one embodiment, during first time injection, also motlten metal is expelled in the rising head be communicated with the upper part of the cavity in mould, and the motlten metal be expelled to by gravitational discharge in rising head, and motlten metal second time can be expelled in cavity when cancelling the decompression of casting chamber.
In one embodiment, the method can comprise by mould insert be provided with to be coupled to injection-tube in the casting chamber of injection-tube, and with filled media fill casting chamber interior section after by decompression perform motlten metal first time injection.
In one embodiment, the decompression rate of adjustable casting chamber is to regulate the speed be expelled to by motlten metal in mould.
Injection-tube, pressure-regulating device and filled media can be reused.
Technique effect
When applying dual casting method of the present invention and equipment, shrink defects and air blister defect can be prevented, can be easy to remove the impurity that comprises in the molten metal with Ductile iron, splendid precision can be had, complex-shaped product can be manufactured, and entrance, pressure-regulating device, filled media etc. can be reused, thus make it possible to cost-saving and boost productivity.
Accompanying drawing explanation
Fig. 1 shows the sectional view of the dual Casting Equipment according to an embodiment of the invention.
Fig. 2 (a) shows the sectional view of the injection-tube according to an embodiment of the invention, and Fig. 2 (b) shows the sectional view of injection-tube according to another implementation of the invention.
Fig. 3 shows dual Casting Equipment according to another implementation of the invention.
Detailed description of the invention
One aspect of the present invention relates to dual Casting Equipment.
Fig. 1 shows the sectional view of the dual Casting Equipment according to an embodiment of the invention.With reference to figure 1, dual Casting Equipment (100) comprising: casting chamber (10), forms a space segment in casting chamber; Injection-tube (20), this injection-tube is arranged on casting chamber (10) below, and motlten metal is injected in this injection-tube; Mould (30), this mould is removably connected to injection-tube (20) and has chamber (35); Filled media (40), this filled media is filled between the interior section of casting chamber (10) and mould (30); And pressure-regulating device (60), this pressure-regulating device is arranged on casting chamber (10) top and reduces pressure to the interior section of casting chamber (10).
A space segment can be formed in casting chamber (10) to make it possible to fill filled media (40) fixed mould (30), and casting chamber (10) can be made to be decompressed to by pressure-regulating device (60) to be equal to or less than atmospheric pressure to provide decompression air in mould (30).
Injection-tube (20) is immersed in casting chamber (10), is arranged on casting chamber (10) below and fixes, and a part for injection-tube (20) is stretched out and soaked in the molten metal to be injected into by motlten metal in mould (30).Although illustrated an injection-tube (20) in Fig. 1, in other embodiments, also in casting chamber (10), multiple injection-tube (20) can be installed.
The injection-tube (20) formed by common material can be used.Such as, injection-tube (20) can be formed by the refractory material that can prevent when contacting with motlten metal to react (such as, pottery), but material is not limited thereto.
With reference to figure 1, in the present invention, the internal diameter (d1) of injection-tube (20) can be greater than the internal diameter (d2) of cavity (35).In this case, even if when cancelling decompression, the time that motlten metal stops also can increase.In one embodiment, the internal diameter (d2) of cavity (35) and the ratio (d2:d1) of the internal diameter (d1) of injection-tube (20) can be about 1:1.1 to about 1:3.Preferably, this ratio can be about 1:1.5 to about 1:2.5.More preferably, this ratio can be about 1:2.In above-mentioned scope, even if when cancelling the decompression of casting chamber (10), the time that motlten metal stops also can increase.
The shape of the entrance of injection-tube (20) can be designed to mould adaptive.Fig. 2 (a) shows the sectional view of the injection-tube (20) according to an embodiment of the invention, and Fig. 2 (b) shows the sectional view of injection-tube (21) according to another implementation of the invention.As shown in Fig. 2 (a) He Fig. 2 (b), the part contacted with the basal surface of casting chamber can be very wide and upwards narrow gradually.
Mould (30) is removably connected to injection-tube (20), and its cavity (35) can have the shape of product of expectation.
The mould (30) formed by common material can be used.Such as, sand mo(u)ld can be used as mould (30).In one embodiment, can by obtain mixed sand (comprising sand, water soluble phenol resin and ester group curing agent (but material is not limited thereto)) and mixed sand is inserted in mould produce mould (30) after use this mould.
Sand can use normal sands.Such as, silica sand, zircon sand, chromite sand, olivine sand or aluminum oxide sand can be used.In one embodiment, diameter can be used to be the sand of about 0.05 millimeter to about 1 millimeter.
In an embodiment of the invention, in casting chamber (10), multiple mould (30) can be installed.Such as, one to nine mould (30) can be installed, make like this come cost-saving by effectively utilizing space and boost productivity.
Because the resin be attached at around sand can disappear because of the heat in sand mo(u)ld after a predetermined amount of time, therefore sand mo(u)ld can cave in naturally.Therefore, because mould (30) and ceramic injection pipe (20) natural separation make the injection-tube (20) being attached to shell reusable, therefore cost-saving effects is improved, and because injection-tube (20) is fixed to casting chamber (10) (going out as shown in Figure 1) and mould (30) can constantly be changed automatically, therefore improve the effect boosted productivity.
Filled media (40) can be filled in around the mould (30) in casting chamber (10) with supporting mould (30).The filled media (40) formed by common material can be used.Such as, refractory particle (such as, mixed sand or sand) can be used, but material is not limited thereto.
In one embodiment, filled media (40) can be filled while vibration casting chamber (10) being applied to the scheduled volume time, thus make it possible to fill filled media (40) equably, increase packed density simultaneously.
In one embodiment, dual Casting Equipment (100) also can comprise rising head (50), this rising head holds motlten metal by being communicated with the upper part of the cavity (35) in mould (30), and by gravity, motlten metal is disposed to cavity.Rising head (50) can be comprised to prevent from when mould (30) solidifies comprising impurity or Ductile iron (such as, bubble) in product.With reference to figure 1, as in an embodiment of the invention, rising head (50) can be arranged on cavity (35) top.In one embodiment, the lower surface of rising head (50) can be arranged on above the top surface of cavity (35).In one embodiment, the spacing between the lower surface of rising head (50) and the top surface of cavity (35) can be about 1 centimetre to about 100 centimetres.
Therefore, when filling motlten metal from the low portion of mould (30) and making motlten metal mobile towards rising head (50), impurity residual in initial unstable motlten metal and mixture can move up thus remove from product, and the motlten metal be expelled in rising head (50) is expelled to the cavity (30) of rising head (50) below by gravity from the rising head (50) being arranged on cavity (30) top, defect and air blister defect is shunk to prevent product, thus the bubble made it possible in the motlten metal that removal is included in cavity (35) and air, make it possible to realize excellent precision, and make it possible to produce complex-shaped product.
In one embodiment, the size of rising head (50) can be formed as about 30 percents by volume of the volume of mould (30) to about 120 percents by volume.In one embodiment, the size of rising head (50) can be formed as about 50 percents by volume of the volume of mould (30) to about 80 percents by volume.
Can easily remove the impurity comprised in the molten metal in above-mentioned scope, and bubble residual in mould (30) and air can be removed easily.
Pressure-regulating device (60) can be arranged on casting chamber (10) top, and the pressure in adjustable casting chamber (10) reduces pressure to make casting chamber (10).In one embodiment, pressure-regulating device (60) can comprise strum (64), vavuum pump (not shown) and suction line (62).With reference to figure 1, strum (64) is connected to the upper part of casting chamber (10), suction line (62) is connected to a surface of strum (64), and suction line (62) can be contacted with vavuum pump (not shown) with the pressure regulated by operated vacuum pumps in casting chamber (10).
When being included in the vavuum pump in pressure-regulating device (60) and running, strum (64) can play and only allow gas by suction line (62) and the effect preventing from sucking filled media (40).
The pressure of the adjustable casting chamber of vavuum pump (not shown) (10) to remove the gas in mould (30), and regulates the speed of injection motlten metal.Vavuum pump can use conventional vacuum pump.Such as, ionic pump, diffusion pump etc. can be used, but the type of pump is not limited thereto.
When vacuum pump operation, the gas that suction line (62) can discharge in casting chamber (10) reduces to make the pressure in casting chamber (10).Herein, the speed that the speed that the internal pressure of adjustable casting chamber (10) reduces is sprayed to regulate injection motlten metal.
Fig. 3 shows dual Casting Equipment (100) according to another implementation of the invention.With reference to figure 3, dual Casting Equipment (100) also can comprise for melt raw material to form the melting furnace (70) of motlten metal.With reference to figure 3, in one embodiment, melting furnace (70) can be arranged on the low portion of dual Casting Equipment (100), and to inject motlten metal by making casting chamber (10) reduce pressure in the injection-tube (20) of dual Casting Equipment (100) can immerse in melting furnace (70) motlten metal.In one embodiment, the degree of depth that injection-tube (20) immerses in the motlten metal be formed in melting furnace (70) can be about 3 centimetres to about 10 centimetres.Under these conditions, farthest prevent and extraneous air is introduced with Ductile iron in motlten metal, and the speed of adjustable injection motlten metal.
In one embodiment, melting furnace (70) can use general furnace.Such as, the electric furnace comprising coil type heating unit (such as, tungsten and kanthal) can be used for heating the raw material be accommodated therein and forming motlten metal.
Another aspect of the present invention relates to the dual casting method using dual Casting Equipment (100).In one embodiment, dual casting method can comprise make casting chamber (10) reduce pressure with perform by motlten metal first time be expelled in cavity (35); And cancel decompression to perform the second time injection of motlten metal.
More specifically, dual casting method can comprise: make casting chamber (10) decompression being filled with filled media (40) by pressure-regulating device (60), and be expelled in cavity (35) mould (30) in along injection-tube (20) by motlten metal first time by the pressure differential with outside; And first time the motlten metal be expelled in cavity (35) cancel the decompression of casting chamber (10) before solidifying, performed the second time injection of motlten metal by gravity, and dismantle casting chamber and be separated to make mould.
In one embodiment, dual casting method can comprise in the casting chamber (10) being inserted into by mould (30) and being provided with injection-tube, to be coupled to injection-tube (20), and the decompression by utilizing pressure-regulating device to carry out after the interior section utilizing filled media (40) filling casting chamber (10) to inject motlten metal for the first time.
Below, each step of dual casting method will be described in detail.
A () forms motlten metal
This step is: make to be contained in melting sources in melting furnace (70) to form motlten metal.Electric furnace can be used as melting furnace (70), and the heater coil be included in electric furnace can be used for heating and melt raw material, but embodiment is not limited thereto.
B () first time injects motlten metal
This step is: filled media (40) be filled between casting chamber (10) and mould (30), then by pressure-regulating device (60), the internal pressure of casting chamber (10) is reduced.In one embodiment, the pressure of reduction can be adjusted to about 10
-2holder is to about 10
-5holder.Under these conditions, the speed of injection motlten metal can be regulated easily, and can Ductile iron.
After the injection-tube (20) of the casting chamber (10) by decompression immerses in the motlten metal manufactured, in mould (30), motlten metal first time is expelled in cavity (35) along injection-tube (20) by the pressure differential between casting chamber (10) and outside.
In one embodiment, the degree of depth that injection-tube (20) immerses the motlten metal be formed in melting furnace (70) can be about 3 centimetres to about 10 centimetres, and injectable motlten metal.Under these conditions, farthest prevent and extraneous air is introduced with Ductile iron in motlten metal, and the speed of injection motlten metal can be regulated easily.
In one embodiment, at decompression, the decompression rate of adjustable casting chamber (10) is to regulate the speed of to be injected by motlten metal in mould (30).Specifically, in order to based on by the consistent minimize turbulence of the expected product shape of the data obtained that repeatedly to manufacture a product, the decompression rate that adjustable pressure adjusting device (60) is applied is to regulate the speed of injecting motlten metal.Such as, decompression rate can be adjusted to about 0.1cm/s to about 30cm/s.When injection speed specifies as above, can prevent motlten metal turbulent phenomenon produce bubble and mould (30) discreet portions fill in motlten metal be interfered time occur casting flaw, such as lack of fill problem.
In another embodiment, at decompression, motlten metal is expelled to the speed in the rising head (50) be communicated with the upper part of cavity (35) by the decompression rate of adjustable casting chamber (10) during first time injection with adjustment.
C () second time injects motlten metal
This step is: first time the motlten metal be expelled in cavity (35) cancel casting chamber (10) before solidifying decompression to be performed the second time injection of motlten metal by gravity.The first time injection of motlten metal is from motion from top to bottom, and second time to inject motlten metal be motion from top to bottom.
In one embodiment, first time is expelled to motlten metal first directed the solidifying from the outside of cavity (35) in cavity (35).Therefore, relatively low impurity (or mixture) solidifiable of density on the surface of cavity (35), and is easy to remove.In addition, the hole formed at cavity (35) place during can being easy to remove the second time injection of motlten metal and bubble.
In another embodiment, when forming rising head (50) be communicated with the upper part of cavity (35), the motlten metal be expelled in rising head (50) can be discharged by gravity when cancelling the decompression of casting chamber (10), and motlten metal second time can be expelled in cavity (35).When being expelled in mould (30) by gravity second time by the motlten metal be expelled in rising head (50), the hole and bubble that are formed at cavity (35) place can be removed easily.
D () dismantles
This step is: after second time injection motlten metal also obtains the product be formed in mould (30), dismantle casting chamber (10).
Fig. 3 shows dual Casting Equipment (100) according to another implementation of the invention.With reference to figure 3, injection-tube (20), pressure-regulating device (60) and filled media (40) can be dismantled from casting chamber (10a) easily.Such as, utilizing after dual casting method completes the manufacture of expected product, separable and dismantle casting chamber (10a), and injection-tube (20), pressure-regulating device (60) and filled media (40) can be arranged on another casting chamber (10b) go up and reuse, thus there is cost-saving effect.
Hereinafter, the preferred embodiment of the present invention will be utilized to describe structure of the present invention and operation in more detail.But, these embodiments only for illustration of object, and should not be interpreted as limit the present invention.
Because those of ordinary skill in the art can infer the content do not described in literary composition easily, because omitted herein the description to these contents.
embodiment
The injection-tube (20) formed by ceramic material is arranged on the base section of cylindricality casting chamber (10), wherein, injection-tube (20) has the shape shown by Fig. 2 (a) and grows 200 millimeters, the diameter of this casting chamber is 600 millimeters, is highly 800 millimeters.
Next, use and manufacture the mixed sand comprising sand, water soluble phenol resin and ester group curing agent and manufacture the mould (30) with cavity (35), and mould (30) be placed in injection-tube (20) entrance on and be arranged on casting chamber (10).Here, the internal diameter (d1) of the injection-tube of use is Φ 50 millimeters, and the internal diameter (d2) of chamber inlet is Φ 25 millimeters.The rising head (50) be communicated with the upper part of cavity (35) is arranged on mould (30).Here, the size of rising head (50) is formed as 65 percents by volume of the cumulative volume of mould (30).
Here, the mould (30) formed as shown in Figure 1 is placed on injection-tube (20) to prevent from forming gap.Filled media (40) is filled between casting chamber (10) and mould (30), applies vibration to casting chamber (10) simultaneously.
Prepare melting furnace (electric furnace) (70) that comprise tungsten coil type heating unit, raw material is inserted in melting furnace (70) and also heat to manufacture motlten metal.Then, be arranged in casting chamber (10) by the pressure-regulating device (60) comprising strum (64), suction line (62) and vavuum pump (not shown), operated vacuum pumps (not shown) keeps 10 to make the interior section of casting chamber (10)
-3the vacuum state of holder.Then, is immersed 50 millimeters in the motlten metal that ceramic injection pipe (20) is manufactured in electric furnace, and motlten metal first time is expelled in injection-tube (20) motlten metal to be upwards injected to mould (30) and rising head (50).Close vavuum pump after 90 seconds, and before the motlten metal of first time injection solidifies, by gravity, the motlten metal be upwards expelled in rising head (50) second time is expelled in cavity (35).After 120 seconds, mobile casting chamber (10) is to be located on dismounting conveyer, thus obtains the product formed in the cavity (35) in mould (30).Here, do not find casting flaw in the product of acquisition, such as bubble, worm channel, lack of fill part etc.
Claims (12)
1. a dual Casting Equipment, comprising:
Casting chamber, forms a space segment in described casting chamber;
Injection-tube, described injection-tube is arranged on below described casting chamber, and motlten metal is injected in described injection-tube;
Mould, described mould is connected to described injection-tube removedly, and described mould has cavity;
Filled media, described filled media is filled between the interior section of described casting chamber and described mould; And
Pressure-regulating device, described pressure-regulating device is arranged on above described casting chamber, and described pressure-regulating device is constructed such that the described interior section decompression of described casting chamber.
2. dual Casting Equipment according to claim 1, described dual Casting Equipment also comprises rising head, described rising head is configured to by being communicated with the upper part of the described cavity in described mould and holds described motlten metal, and described motlten metal is disposed to described cavity.
3. dual Casting Equipment according to claim 1, wherein, the size of described rising head is formed as about 30 percents by volume of described mould to about 120 percents by volume.
4. dual Casting Equipment according to claim 1, described dual Casting Equipment also comprises melting furnace, and described melting furnace is configured to melt raw material to form motlten metal.
5. dual Casting Equipment according to claim 1, wherein, the internal diameter of described injection-tube is greater than the internal diameter of the entrance of described cavity.
6. dual Casting Equipment according to claim 5, wherein, the internal diameter of described cavity and the ratio of the internal diameter of described injection-tube are about 1:1.1 to about 1:3.
7. dual Casting Equipment according to claim 1, wherein, described pressure-regulating device comprises strum, vavuum pump and suction line.
8. a dual casting method, comprising:
Make to be filled with casting chamber's decompression of filled media by pressure-regulating device, and injected by the first time performed in the cavity along injection-tube motlten metal is expelled in mould with the pressure differential of outside; And
First time the described motlten metal be expelled in described cavity solidify before cancel described casting chamber decompression and by gravity perform described motlten metal second time injection.
9. dual casting method according to claim 8, wherein:
In described first time injection, also described motlten metal is expelled in the rising head be communicated with the upper part of the described cavity in described mould; And
Be expelled to the described motlten metal in described rising head by gravitational discharge, and when cancelling the decompression of described casting chamber, described motlten metal second time be expelled in described cavity.
10. dual casting method according to claim 8, described dual casting method also comprise described mould inserted above be provided with to be coupled to described injection-tube in the described casting chamber of described injection-tube, and performed the first time injection of described motlten metal by decompression after the interior section of filling described casting chamber by described filled media.
11. dual casting methods according to claim 8, wherein, regulate the decompression rate of described casting chamber to regulate the speed be expelled to by described motlten metal in described mould.
12. dual casting methods according to claim 8, wherein, described injection-tube, described pressure-regulating device and described filled media can be reused.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2013-0052062 | 2013-05-08 | ||
| KR1020130052062A KR101367200B1 (en) | 2013-05-08 | 2013-05-08 | Process for duplex casting and process for duplex casting apparatus thereof |
| PCT/KR2014/004016 WO2014182045A1 (en) | 2013-05-08 | 2014-05-07 | Double casting method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105492143A true CN105492143A (en) | 2016-04-13 |
Family
ID=50271930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480038602.4A Pending CN105492143A (en) | 2013-05-08 | 2014-05-07 | Double casting method and apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20160129498A1 (en) |
| JP (1) | JP6117992B2 (en) |
| KR (1) | KR101367200B1 (en) |
| CN (1) | CN105492143A (en) |
| DE (1) | DE112014002341T5 (en) |
| WO (1) | WO2014182045A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111687395A (en) * | 2019-03-14 | 2020-09-22 | 通用电气公司 | Multiple materials and microstructures in cast alloys |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369442B (en) * | 2021-05-25 | 2022-11-04 | 庆铃汽车（集团）有限公司 | Injection riser and riser device for improving internal defects of castings |
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- 2014-05-07 JP JP2016512831A patent/JP6117992B2/en not_active Expired - Fee Related
- 2014-05-07 CN CN201480038602.4A patent/CN105492143A/en active Pending
- 2014-05-07 US US14/889,821 patent/US20160129498A1/en not_active Abandoned
- 2014-05-07 WO PCT/KR2014/004016 patent/WO2014182045A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| US20160129498A1 (en) | 2016-05-12 |
| JP6117992B2 (en) | 2017-04-19 |
| DE112014002341T5 (en) | 2016-01-28 |
| JP2016517803A (en) | 2016-06-20 |
| WO2014182045A1 (en) | 2014-11-13 |
| KR101367200B1 (en) | 2014-02-26 |
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