CN105798272A - Automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, gating system and casting method - Google Patents
Automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, gating system and casting method Download PDFInfo
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- CN105798272A CN105798272A CN201610257081.2A CN201610257081A CN105798272A CN 105798272 A CN105798272 A CN 105798272A CN 201610257081 A CN201610257081 A CN 201610257081A CN 105798272 A CN105798272 A CN 105798272A
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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
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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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
- B22C9/082—Sprues, pouring cups
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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
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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Abstract
The invention relates to an automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, a gating system and a casting method. The automobile mold casting comprises a mold base and a working part, wherein the mold base and the working part are cast and formed at a time. The mold base is made of the ordinary gray iron. The working part is made of the alloy gray iron. Metallurgical bonding is adopted for the bonding face of the mold base and the working part. In this way, the mold base and the working part are integrally cast and formed at a time, and the casting production time is saved; and meanwhile, because machining standards of molds are basically consistent, the machining workloads are substantially reduced, the machining precision is substantially improved, the machining time is obviously shortened, the machining cost is reduced, the mold assembling and debugging difficulty is substantially lowered for bench workers, and the mold assembling and debugging time is substantially shortened for the bench workers. In addition, the metallurgical bonding is adopted for the bonding face of the mold base and the working part, the bonding face has good process performance, the bonding strength is high, and therefore the problem that the bonding face cracks is avoided.
Description
Technical field
The invention belongs to automobile die casting field, be specially a kind of alloy gray iron and the automobile die cast of common gray iron composite casting, running gate system and casting method.
Background technology
Automobile die has been that auto parts and components shape, it is achieved the critical equipment of auto output, in the exploitation of automobile, is responsible for important responsibility in the remodeling of automobile.A brand-new vehicle takes around 350-400 and overlaps car panel die, overbalances one hundred million.And a remodeling car on average there are about the car panel die of 25% and needs to change, the mould of replacing be worth also reach tens million of.Ge great automobile production producer all using the cycle improving automobile listing as one of Important Action improving competitiveness, thus the renewal time and quality to car panel die propose requirements at the higher level.Existing automobile die production method, is mould is divided into die holder and working portion, again working portion is divided into multiple insert, to die holder and the cast form respectively of multiple insert.Working portion is generally with bolts with pedestal connected mode, but owing to the contact surface between working portion and pedestal is very big, machining accuracy requires height, and workman is before debugging mould, adopt bolt that working portion and pedestal couple together trouble, carrying and management trouble.
Running gate system is the passage that casting liquid enters die cavity, rational injection system structure is for ensureing that casting quality plays critically important effect, running gate system and molten metal fluidised form, the discharges of type intracavity gas etc. are closely related, and filling speed, filling time, die cavity temperature etc. can be filled type condition and play regulatory role, but irrational running gate system can cause the defects such as pore, shrinkage cavity shrinkage porosity, cold shut and poor surface smoothness.
The feature of bimetallic compound casting is, by the mode of production of casting, two kinds of different metals are formed firmly metallurgical binding, has a foundry goods have two kinds of metallicity compound casting blanks or part simultaneously thus casting out.
In the process of biliquid composite casting, two kinds of casting liquid can not rush mixed, the mixed purity that can reduce high-rigidity cast liquid material of punching, thus reducing the mechanical performance of work package, cold shut, oxide inclusion defect can not occurs in two kinds of melts combine faces again.But, traditional biliquid composite casting method is all adopt two single apparatus for pouring superpositions to realize biliquid composite casting molding, it is easy to causes that two kinds of casting liquid punchings mix or cold shut, oxide inclusion defect, affects the quality of biliquid compound casting.
Summary of the invention
The technical problem to be solved in the present invention is: provide the automobile die cast of a kind of alloy gray iron and common gray iron composite casting, it can avoid two kinds of molten metal punchings mixed in the process of automobile die cast casting, improves the quality of alloy gray iron and the automobile die cast of common gray iron composite casting.
Another that the invention solves the problems that technical problem is that: provides a kind of running gate system casting automobile die cast, and it can avoid two kinds of molten metal punchings mixed in the process of casting automobile die cast, improves the castability of automobile die cast.
What the invention solves the problems that another technical problem is that: provide the casting method of a kind of automobile die cast, and it can avoid two kinds of molten metals punchings mixed in the process of casting automobile die cast, improves the castability of automobile die cast.
In order to solve above-mentioned first technical problem, the present invention provides the automobile die cast of a kind of alloy gray iron and common gray iron composite casting, it die holder including disposable casting and working portion, the material of described die holder is common gray iron, the material of described working portion is alloy gray iron, and the faying face of described die holder and working portion is metallurgical binding.So, described automobile die cast adopts the method for bimetal composite casting, by disposable to die holder and working portion overall cast form, has saved the Foundry Production time；And due to die holder and the disposable monolithic molding of working portion, molding machine machining benchmark is basically identical, workload is greatly reduced, machining accuracy increases substantially in machining, hence it is evident that shortens machining time, reduces machining cost.Further, since the material of described die holder is common gray iron, the material of described working portion is alloy gray iron, and difficulty and the time of such fitter assembly debugging mould are greatly shortened.And, the combination interface of described die holder and working portion is metallurgical binding, and between combination interface, common gray iron and alloy gray iron atom diffuse to form faying face mutually, so, faying face has good processing performance, and bond strength is high, thus the problem avoiding faying face cracking.
In order to solve above-mentioned second technical problem, the present invention provides a kind of running gate system casting automobile die cast, including alloy gray iron apparatus for pouring and common gray iron apparatus for pouring, described alloy gray iron apparatus for pouring is connected with the bottom of casting mold, described common gray iron apparatus for pouring is connected with the top of casting mold, is provided with overfall between bottom and the top of described casting mold.So, in the process of bimetal composite casting, first pass through alloy gray iron apparatus for pouring cast alloy gray iron liquid, alloy gray iron liquid is poured into the bottom of casting mold, owing to being provided with overfall between bottom and the top of casting mold, when alloy gray iron liquid is poured into overfall position, unnecessary alloy gray iron liquid is allowed to discharge casting mold inner chamber, thus controlling the liquid level of required alloy gray iron liquid, and the liquid level being made alloy gray iron liquid by the abundant overflow of overfall is pure, again overfall is blocked, by common gray iron apparatus for pouring, common gray iron liquid is poured into the top of casting mold, thus described alloy gray iron liquid and common gray iron liquid form metallurgical binding face at overfall place, and alloy gray iron liquid and common gray iron liquid do not interfere with each other in casting process, do not rush mixed, therefore the quality of bimetallic compound casting is improved.Further, overfall can be arranged on the opposite of described alloy gray iron apparatus for pouring, such alloy gray iron apparatus for pouring is Open architecture, adopt in the process of alloy gray iron apparatus for pouring cast alloy gray iron liquid, the mobility of alloy gray iron liquid can be more steady, alloy gray iron liquid can also be reduced oxidized simultaneously, be more favorable to, by overfall, unnecessary alloy gray iron liquid is discharged casting mold inner chamber.
Another technical scheme of the present invention is in that on above-mentioned basis, and described casting mold is the foam mold of preset shape and size.
Another technical scheme of the present invention is in that, on above-mentioned basis, the bottom of described casting mold to be provided with chiller.
Another technical scheme of the present invention is in that on above-mentioned basis, and described chiller is the external chill of the lower outside being arranged on described casting mold.
Another technical scheme of the present invention is in that, on above-mentioned basis, the top of described casting mold is provided with aerofluxus rising head.
Another technical scheme of the present invention is in that on above-mentioned basis, and described aerofluxus rising head is provided with multiple, and uniformly, interval be arranged in the top of described casting mold.
Another technical scheme of the present invention is in that on above-mentioned basis, and described foam mold is painted with coating, and the thickness of described coating is 1.5～2.5mm.
Another technical scheme of the present invention is in that on above-mentioned basis, described alloy gray iron apparatus for pouring includes the first sprue, the first cross gate and the first ingate, and described first sprue, the first cross gate and the first ingate section area ratio are 1:1.1～1.3:1.4～1.8；And/or described common gray iron apparatus for pouring includes the second sprue, the second cross gate, the 3rd cross gate and the second ingate, the section area ratio of described second sprue, the second cross gate, the 3rd cross gate and the second ingate is 1:1.1～1.3:1.3～1.5:1.5～2.
Another technical scheme of the present invention is in that on above-mentioned basis, first sprue and/or the second sprue are pottery depositing, described first cross gate, the second cross gate and/or the 3rd cross gate are foam running channel, and described first ingate and/or the second ingate are foam running channel.
Another technical scheme of the present invention is in that on above-mentioned basis, the top 500mm more than higher than the top of casting mold of described second sprue.As such, it is possible to utilize the gravity of common gray iron liquid that bimetallic compound casting carries out feeding, reduce feeding cost, improve production efficiency.
In order to solve above-mentioned 3rd technical problem, the present invention provides the casting method of a kind of automobile die cast, it is characterised in that comprise the following steps: prepare casting mold, according to shape and the size of automobile die, prepare to comprise the foam mold casting mold mated with automobile die shape and size；Cast alloy gray iron liquid, by running gate system, alloy gray iron liquid is poured into the bottom of casting mold, between bottom and the top of casting mold of casting mold, is provided with overfall, treat that alloy gray iron liquid was from overfall overflow 5～15 seconds, stop cast alloy gray iron liquid, and overfall is blocked；Pour into a mould common gray iron liquid, by running gate system, common gray iron liquid is poured into the top of casting mold；Described automobile die cast is obtained after cooled and solidified.So, in the casting process of automobile die cast, first pass through running gate system and alloy gray iron liquid is poured into the bottom of casting mold, owing to being provided with overfall between bottom and the top of casting mold, when alloy gray iron liquid is poured into overfall position, unnecessary alloy gray iron liquid is allowed to discharge casting mold inner chamber, thus controlling the liquid level of required alloy gray iron liquid, and until alloy gray iron liquid from after overfall overflow 5～15 seconds, the liquid level being made alloy gray iron liquid by the abundant overflow of overfall is pure, again overfall is blocked, again through running gate system, common gray iron liquid is poured into the top of casting mold, the automobile die cast of alloy gray iron and common gray iron composite casting is obtained after cooled and solidified.Thus the combination interface place of described die holder and working portion forms metallurgical binding face, and alloy gray iron liquid and common gray iron liquid do not interfere with each other in casting process, it is mixed not rush, therefore improve the quality of alloy gray iron and the automobile die cast of common gray iron composite casting.
Another technical scheme of the present invention is in that on above-mentioned basis, in described cast alloy gray iron liquid step, when described alloy gray iron liquid is near overfall position, reduces the poring rate of alloy gray iron liquid.
Another technical scheme of the present invention is in that on above-mentioned basis, in described cast alloy gray iron liquid step, when overfall start overflow go out alloy gray iron ferrum liquid time, abundant overflow 5～15 seconds.
Another technical scheme of the present invention is in that on above-mentioned basis, in described cast alloy gray iron liquid step, when described alloy gray iron liquid is near overfall position, the spillway discharge of alloy gray iron liquid is measured by balance magnetometer, when spillway discharge is 200～300kg, stop cast alloy gray iron liquid, and overfall is blocked.
Another technical scheme of the present invention is in that on above-mentioned basis, in described cast alloy gray iron liquid step and pour into a mould between common gray iron liquid step, and 2～5 minutes, interval.
Another technical scheme of the present invention is in that on above-mentioned basis, also includes adding antioxidant step, add anti-oxidation rare earth composite fluxing agent in alloy gray iron liquid in described cast alloy gray iron liquid step.
Another technical scheme of the present invention is in that on above-mentioned basis, and the pouring temperature of described alloy gray iron liquid is 1360～1400 DEG C, and the pouring temperature of described common gray iron liquid is 1370～1410 DEG C.
Another technical scheme of the present invention is in that on above-mentioned basis, described preparation casting mold step also includes brushing paint step, bubbles model brush lost foam cast iron coating, brush 2～4 times coating, often painting carries out the brushing of next time again after brushing one times and drying, and paint coatings gross thickness is 1.5～2.5mm.
Accompanying drawing explanation
Fig. 1 is the structure chart representing the alloy gray iron involved by a kind of embodiment of this patent with the automobile die cast of common gray iron composite casting；
Fig. 2 is the structure chart of the running gate system representing the casting automobile die cast involved by a kind of embodiment of this patent；
Fig. 3 is the axonometric chart of running gate system shown in Fig. 2；
Fig. 4 is the flow chart representing the casting method involved by a kind of embodiment of this patent.
In figure:
The 1 common gray iron apparatus for pouring of alloy gray iron apparatus for pouring 2
3 casting mold 4 overfalls
5 external chill 6 aerofluxus rising head 11 first sprues
12 first cross gate 13 first ingate 21 second sprues
22 second cross gate 23 second ingate 24 the 3rd cross gates
Detailed description of the invention
Describing the present invention below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, and protection scope of the present invention should not have any restriction effect.Additionally, the description that those skilled in the art are according to presents, it is possible to the feature in embodiment in presents and in different embodiment is carried out respective combination.
The embodiment of the present invention is as follows; refer to Fig. 1; for representing the automobile die cast of a kind of alloy gray iron involved by a kind of embodiment of this patent and common gray iron composite casting; automobile die cast is preferably drawing die or curring and sizing die; it die holder including disposable casting and working portion; the material of described die holder is common gray iron, and the material of described working portion is alloy gray iron, and the faying face of described die holder and working portion is metallurgical binding.So; described automobile die cast adopts the method for bimetal composite casting; by disposable to die holder and working portion overall cast form; mould (is divided into HT300 die holder and alloy gray iron punch or insert casting respectively by relatively existing automobile die cast production method; again respectively to punch or insert and die holder equipment face processing bedding-in; bolt is used punch or insert and die holder to be fitted together), save the Foundry Production time；And due to die holder and the disposable monolithic molding of working portion, molding machine machining benchmark is basically identical, workload is greatly reduced, machining accuracy increases substantially in machining, hence it is evident that shortens machining time, reduces machining cost.It addition, the material of described die holder is common gray iron, the material of described working portion is alloy gray iron, and difficulty and the time of such fitter assembly debugging mould are greatly shortened.And, the combination interface of described die holder and working portion is metallurgical binding, and between combination interface, common gray iron and alloy gray iron atom diffuse to form faying face mutually, so, faying face has good processing performance, and bond strength is high, thus the problem avoiding faying face cracking.Alloy gray iron can be Alloy Cast Iron or other alloy cast irons, Alloy Cast Iron mainly has: E46H, ENCD, ECI55, UTP665 (CMC-E46N), that conventional is CMC-E46H, and its hardness is high, suitable in the bead manufacture of high request, the R angle being particularly suitable for Alloy Cast Iron mould is repaired and the making of drawing position.Common gray iron refers to the cast iron with flake graphite, and during because of fracture, fracture is lead, therefore is called casting pig.Main component is ferrum, carbon, silicon, manganese, sulfur, phosphorus, is most widely used cast iron.Casting pig HT300 is the casting pig of pearlite type.Wherein, alloy gray iron and casting pig are all known materials, it is possible to obtained by already known processes smelting processing manufacture.
On the basis of above-described embodiment, in another embodiment of the present invention, refer to Fig. 2 and Fig. 3, a kind of running gate system casting automobile die cast is provided, including alloy gray iron apparatus for pouring 1 and common gray iron apparatus for pouring 2, described alloy gray iron apparatus for pouring 1 is connected with the bottom of casting mold 3, described common gray iron apparatus for pouring 2 is connected with the top of casting mold 3, it is provided with overfall 4, described alloy gray iron apparatus for pouring 1 and common gray iron apparatus for pouring 2 between bottom and the top of described casting mold 3 and is relatively arranged on the both sides of casting mold 3.So, in the process of bimetal composite casting, first pass through alloy gray iron apparatus for pouring 1 and pour into a mould alloy gray iron liquid, alloy gray iron liquid is poured into the bottom of casting mold 3, owing to being provided with overfall 4 between bottom and the top of casting mold 3, when alloy gray iron liquid is poured into overfall 4 position, unnecessary alloy gray iron liquid is allowed to discharge casting mold 3 inner chamber, thus controlling the liquid level of required alloy gray iron liquid, and the liquid level making alloy gray iron liquid by the abundant overflow of overfall 4 is pure, again overfall 4 is blocked, by common gray iron apparatus for pouring 2, common gray iron liquid is poured into the top of casting mold 3, thus described alloy gray iron liquid and common gray iron liquid form metallurgical binding face at overfall 4 place, and alloy gray iron liquid and common gray iron liquid do not interfere with each other in casting process, do not rush mixed, therefore the quality of bimetallic compound casting is improved.Described alloy gray iron apparatus for pouring 1 and common gray iron apparatus for pouring 2 are relatively arranged on the both sides of casting mold 3, bimetal composite casting running gate system entirety is so made to be arranged symmetrically, take up room relatively small, be also convenient for alloy gray iron liquid and the cast of common gray iron liquid simultaneously.Preferably, overfall 4 can be arranged on the opposite of described alloy gray iron apparatus for pouring 1, such alloy gray iron apparatus for pouring is Open architecture, adopt in the process of alloy gray iron apparatus for pouring cast alloy gray iron liquid, the mobility of alloy gray iron liquid can be more steady, alloy gray iron liquid can also be reduced oxidized simultaneously, be more favorable to, by overfall, unnecessary alloy gray iron liquid is discharged casting mold inner chamber.
On the basis of above-described embodiment, in another embodiment of the present invention, described casting mold 3 can adopt foam molding, phenolic sand molding.Can being arranged as required to the structure such as gusset, fillet in foam mold, described foam mold can adopt resin sand cast form.
On the basis of above-described embodiment, in another embodiment of the present invention, chiller can be provided with in the bottom of described casting mold 3.So, the alloy gray iron liquid in the bottom being poured into casting mold can be carried out extremely cold by described chiller so that the dense structure of alloy gray iron liquid, without shrinkage porosite.
On the basis of above-described embodiment, in another embodiment of the present invention, described chiller can be the external chill 5 of the lower outside being arranged on described casting mold 3.So, molten steel is had chill effect by external chill, thus ensureing that the key position dense structure of cast steel cutting edge is without shrinkage defect, the modulus of external chill is 1.2～1.5 times of cast steel cutting edge position modulus, and external chill and cast steel cutting edge position are 10～20mm across the thickness of molding sand.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in Figures 2 and 3, the top of described casting mold 3 can be provided with aerofluxus rising head 6.So, the top of described casting mold is provided with aerofluxus rising head, except the effect of the excessive slag of aerofluxus can be played；Feeding effect can also be played.
On the basis of above-described embodiment, in another embodiment of the present invention, described aerofluxus rising head 6 can be provided with multiple, and uniformly, interval be arranged in the top of described casting mold 3.
On the basis of above-described embodiment, in another embodiment of the present invention, described foam mold can being painted with coating, the thickness of described coating is 1.5～2.5mm.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in Figure 2, described alloy gray iron apparatus for pouring 1 can include the first sprue the 11, first cross gate 12 and the first ingate 13, and the section area ratio of described first sprue the 11, first cross gate 12 and the first ingate 13 is 1:1.1～1.3:1.4～1.8；And/or described common gray iron apparatus for pouring 2 can include the second sprue the 21, second cross gate the 22, the 3rd cross gate 24 and the second ingate 23, the section area ratio of described second sprue the 21, second cross gate the 22, the 3rd cross gate 24 and the second ingate 23 is 1:1.1～1.3:1.3～1.5:1.5～2.So, it is possible not only to improve the flowing stationarity of alloy gray iron liquid and/or common gray iron liquid, but also alloy gray iron liquid can be reduced and/or common gray iron liquid is oxidized.Preferably, the sectional area of described second ingate 23 and sectional area ratio 1:0.8～1.2 of described aerofluxus rising head 6, so, at common gray iron apparatus for pouring toward when pouring into a mould common gray iron liquid in casting mold, casting mold type intracavity gas can be discharged from aerofluxus rising head happyly, thus avoiding metal casting to produce the phenomenon such as pore, shrinkage cavity shrinkage porosity.
On the basis of above-described embodiment, in another embodiment of the present invention, described first sprue 11 and/or the second sprue 21 are pottery depositing, described first cross gate the 12, second cross gate 22 and/or the 3rd cross gate 24 are foam running channel, and described first ingate 13 and/or the second ingate 13 are foam running channel.Preferably, the ingate of described first ingate 13 can be arranged on the interfacial lower section of bimetallic compound casting, but can not be arranged on the work surface of bimetallic compound casting, so, the work surface component segregation of bimetallic compound casting, the problem that quenching hardness is inadequate can be avoided.
On the basis of above-described embodiment, in another embodiment of the present invention, the top 500mm more than higher than the top of casting mold of described second sprue 21.As such, it is possible to utilize the gravity of common gray iron liquid that bimetallic compound casting is carried out feeding, thus reducing the cost of feeding, improve production efficiency.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in Figure 4, a kind of casting method of automobile die cast, comprise the following steps: prepare casting mold, according to shape and the size of automobile die, prepare to comprise the foam mold casting mold mated with automobile die shape and size；Melting first casts liquid and the second casting liquid, and described first casting liquid is alloy gray iron liquid, and described second casting liquid is common gray iron liquid；Cast the first casting liquid, cast liquid by running gate system by first and be poured into the bottom of casting mold, between bottom and the top of casting mold of casting mold, be provided with overfall, treat that the first casting liquid was from overfall overflow 5～15 seconds, stop cast the first casting liquid, and overfall is blocked；Cast the second casting liquid, casts liquid by running gate system by second and is poured into the top of casting mold；The automobile die cast of biliquid composite casting is obtained after cooled and solidified.So, in the casting process of automobile die cast, first pass through running gate system and alloy gray iron liquid is poured into the bottom of casting mold, owing to being provided with overfall between bottom and the top of casting mold, when alloy gray iron liquid is poured into overfall position, unnecessary alloy gray iron liquid is allowed to discharge casting mold inner chamber, thus controlling the liquid level of required alloy gray iron liquid, and until alloy gray iron liquid from after overfall overflow 5～15 seconds, the liquid level being made alloy gray iron liquid by the abundant overflow of overfall is pure, again overfall is blocked, again through running gate system, common gray iron liquid is poured into the top of casting mold, the automobile die cast of alloy gray iron and common gray iron composite casting is obtained after cooled and solidified.Thus the combination interface place of described die holder and working portion forms metallurgical binding face, and alloy gray iron liquid and common gray iron liquid do not interfere with each other in casting process, it is mixed not rush, therefore improve the quality of alloy gray iron and the automobile die cast of common gray iron composite casting.
On the basis of above-described embodiment, in another embodiment of the present invention, in described cast alloy gray iron liquid step, when described alloy gray iron liquid is near overfall position, reduce the poring rate of alloy gray iron liquid.As such, it is possible to improve the stationarity that alloy gray iron liquid stream is dynamic so that the faying face of alloy gray iron liquid and common gray iron liquid is a plane as far as possible.
On the basis of above-described embodiment, in another embodiment of the present invention, in described cast alloy gray iron liquid step, when described alloy gray iron liquid starts from overfall overflow, abundant overflow 5～15 seconds, can discharge the oxide slag inclusion on alloy gray iron liquid top layer, faying face can be made again smooth.
On the basis of above-described embodiment, in another embodiment of the present invention, in described cast alloy gray iron liquid step, when described alloy gray iron liquid is near overfall position, the spillway discharge of alloy gray iron liquid is measured by balance magnetometer, when spillway discharge is 200～300kg, stops cast alloy gray iron liquid, and overfall is blocked.As such, it is possible to by the method for balance magnetometer and overfall dual fail-safe, solve the quantitative pouring problem of alloy gray iron liquid, improve accuracy and the safety of cast casting liquid.
On the basis of above-described embodiment, in another embodiment of the present invention, in described cast alloy gray iron liquid step and pour into a mould between common gray iron liquid step, it is possible to according to the pouring temperature of alloy gray iron and weight, 2～5 minutes, interval.So, alloy gray iron liquid is through of short duration cooling, it is in half curdled appearance, pour into a mould common gray iron liquid again, two kinds of metals of alloy gray iron liquid and common gray iron liquid are not rushed not only mixed but also can together with strong bonded, and in the faying face formation metallurgical binding of alloy gray iron liquid with common gray iron liquid, improve processing performance and the bond strength of faying face, thus avoiding the problem that cracking occurs faying face.
On the basis of above-described embodiment, in another embodiment of the present invention, also include adding antioxidant step in described cast alloy gray iron liquid step, in alloy gray iron liquid, add anti-oxidation rare earth composite fluxing agent.As such, it is possible to the faying face reducing alloy gray iron liquid and common gray iron liquid has oxide-film inclusion defect, form metallurgical binding at combination interface, it is to avoid the problem of the easy delamination splitting of faying face of biliquid composite casting automobile die cast.
On the basis of above-described embodiment, in another embodiment of the present invention, as shown in Figure 4, it is possible to adopt two intermediate frequency furnace meltings respectively first to cast liquid, i.e. alloy gray iron liquid, and melting second casts liquid, i.e. common gray iron liquid, and liquid is melting down to be taken off slag totally by casting.During cast, the pouring temperature of described first casting liquid is 1360～1400 DEG C, and the pouring temperature of described second casting liquid is 1370～1410 DEG C.As such, it is possible to improve the metallurgical quality of biliquid as far as possible, reduce automobile die cast and produce the probability of the defect such as slag inclusion, pore, it is ensured that automobile die cast is fine and close, without defects such as obvious shrinkage cavity and porosities.
On the basis of above-described embodiment, in another embodiment of the present invention, described preparation casting mold step also includes brushing paint step, swabbing on described bubbles model, brush 2～4 times coating, often painting carries out the brushing of next time again after brushing one times and drying, and paint coatings gross thickness is 1.5～2.5mm.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the automobile die cast of an alloy gray iron and common gray iron composite casting, it is characterized in that, described automobile die cast includes die holder and the working portion of disposable casting, the material of described die holder is common gray iron, the material of described working portion is alloy gray iron, and the faying face of described die holder and working portion is metallurgical binding.
2. the running gate system casting automobile die cast, it is characterized in that, including alloy gray iron apparatus for pouring and common gray iron apparatus for pouring, described alloy gray iron apparatus for pouring is connected with the bottom of casting mold, described common gray iron apparatus for pouring is connected with the top of casting mold, it is provided with overfall, described alloy gray iron apparatus for pouring and common gray iron apparatus for pouring between bottom and the top of described casting mold and is relatively arranged on the both sides of casting mold.
3. running gate system according to claim 2, it is characterised in that described casting mold is the foam mold of preset shape and size.
4. running gate system according to claim 2, it is characterised in that the bottom of described casting mold is provided with chiller；Or, described chiller is the external chill of the lower outside being arranged on described casting mold.
5. running gate system according to claim 2, it is characterised in that the top of described casting mold is provided with aerofluxus rising head；Or, described aerofluxus rising head is provided with multiple, and uniformly, interval be arranged in the top of described casting mold.
6. running gate system according to claim 3, it is characterised in that be painted with coating in described foam mold, the thickness of described coating is 1.5～2.5mm.
7. according to described running gate system arbitrary in claim 2 to 6, it is characterized in that, described alloy gray iron apparatus for pouring includes the first sprue, the first cross gate and the first ingate, and described first sprue, the first cross gate and the first ingate section area ratio are 1:1.1～1.3:1.4～1.8；And/or described common gray iron apparatus for pouring includes the second sprue, the second cross gate, the 3rd cross gate and the second ingate, the section area ratio of described second sprue, the second cross gate, the 3rd cross gate and the second ingate is 1:1.1～1.3:1.3～1.5:1.5～2.
8. running gate system according to claim 7, it is characterized in that, described first sprue and/or the second sprue are pottery depositing, and described first cross gate, the second cross gate and/or the 3rd cross gate are foam running channel, and described first ingate and/or the second ingate are foam running channel；Or the top 500mm more than higher than the top of casting mold of described second sprue.
9. the casting method of an automobile die cast, it is characterised in that comprise the following steps:
Prepare casting mold, according to shape and the size of automobile die, prepare to comprise the foam mold casting mold mated with automobile die shape and size；
Cast alloy gray iron liquid, by running gate system, alloy gray iron liquid is poured into the bottom of casting mold, between bottom and the top of casting mold of casting mold, is provided with overfall, treat that alloy gray iron liquid was from overfall overflow 5～15 seconds, stop cast alloy gray iron liquid, and overfall is blocked；
Pour into a mould common gray iron liquid, by running gate system, common gray iron liquid is poured into the top of casting mold；
Described automobile die cast is obtained after cooled and solidified.
10. casting method according to claim 9, it is characterised in that in described cast alloy gray iron liquid step, when described alloy gray iron liquid is near overfall position, reduces the poring rate of alloy gray iron liquid；Or, in described cast alloy gray iron liquid step, when overfall start overflow go out alloy gray iron liquid time, abundant overflow 5～15 seconds；Or, in described cast alloy gray iron liquid step and pour into a mould between common gray iron liquid step, 2～5 minutes, interval；Or, also include adding antioxidant step in described cast alloy gray iron liquid step, in alloy gray iron liquid, add anti-oxidation rare earth composite fluxing agent；Or, the pouring temperature of described alloy gray iron liquid is 1360～1400 DEG C, and the pouring temperature of described common gray iron liquid is 1370～1410 DEG C；Or, described preparation casting mold step also includes brushing paint step, bubbles model brush lost foam cast iron coating, brushes 2～4 times coating, often painting carries out the brushing of next time again after brushing one times and drying, and paint coatings gross thickness is 1.5～2.5mm.
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| CN201610257081.2A CN105798272A (en) | 2016-04-22 | 2016-04-22 | Automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, gating system and casting method |
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| CN201610257081.2A CN105798272A (en) | 2016-04-22 | 2016-04-22 | Automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, gating system and casting method |
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