CN104785758B - The preparation method of aluminium bronze composite casting valve plate - Google Patents
The preparation method of aluminium bronze composite casting valve plate Download PDFInfo
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- CN104785758B CN104785758B CN201510206091.9A CN201510206091A CN104785758B CN 104785758 B CN104785758 B CN 104785758B CN 201510206091 A CN201510206091 A CN 201510206091A CN 104785758 B CN104785758 B CN 104785758B
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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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Abstract
The present invention provides a kind of preparation method of aluminium bronze composite casting valve plate, and the preparation method is made up of following steps：Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms cast die cavity；The group of the copper sheathing is divided into aluminium bronze；Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.Using the preparation technology of the present invention, the qualification rate of compound casting can be to more than 96%, and the technique of the present invention solves the technical barrier of prior art long felt mass production.
Description
Technical field
The invention belongs to casting technology field, more particularly to a kind of preparation side for covering arenaceous shell type aluminium bronze composite casting valve plate
Method.
Background technology
Precoated sand is suitable for producing complex precise, it is desirable to higher various foundry goods, such as automobile engine cylinder-body etc., overlay film
Sand can effectively eliminate the deformation in casting process, the various casting flaws such as hot tearing, and the cast(ing) surface for preparing is brighter and cleaner, chi
Very little more accurate, the production cycle can be shortened, raw metal is saved, reduce easily to adopt automating in production cost, and production process,
Reduce artificial use, coated sand technology is especially suitable for the production in enormous quantities manufacture of various small and medium-sized castings.
Shell moulded casting is a kind of derivative new casting technique using coated sand technology, specifically using phenolic aldehyde
Coated sand, rather than common sand mold, form the shell of suitable thickness, it is generally the case that shell in the template of 180-280 degree
Thickness be 6-12mm, afterwards shell is carried out heating cure, make shell reach required for rigidity and intensity, then using thin
Shell the Composition Modeling chamber, and then produce various foundry goods.Shell mold process excellent effect, the foundry goods of casting are clear-cut, surface light
Clean, accurate size, subsequently greatly reduce the workload of machining.
The raising of foundry goods detailing requiments at any time, composite cast application are increasingly extensive, that is, adopt two or more
Metal carries out casting the technique to form foundry goods, and this composite casting technology can prepare increasingly complex foundry goods, comprehensive multiple gold
The characteristic of category, the more excellent foundry goods of forming properties.Copper and iron valve plate casting when, be using aluminium bronze copper sheathing or aluminium bronze copper
Set, forms in the valve plate that copper sheathing is embedded in magnesium iron matrix.In process of production, using embedded mode after processing or can pour during casting
The embedded mode of note fusion；After processing, embedded mode is affected by machining accuracy, and tightness differs, and processing cost is higher；Cast
Fusion is embedded higher to technical process requirement, and the control of wherein pouring type and fusion temperature will be exactly accurate.This compound
Cast member may also be employed traditional clay-bonded sand green casting method and prepare, but due to the process employs horizontal parting cast, lead
The fixing difficulty in die cavity of the copper sheathing in compound casting is caused, easy off normal, foundry goods easily produce gas hole defect, product qualified rate
Low, only reach 70% or so, it is difficult to meet the requirement of large-scale production.
Chinese invention patent application 201310355164.1 (date of publication 2013.11.20) discloses a kind of Iron Mould Coated Sand cylinder
The method of body cast pistons ring, its processing step include：Making mold, moulding, lower core, mould assembling, cast, unpacking, casting cleaning
And machining；The moulding is Iron Mould Coated Sand moulding；The sand layer thickness that covers of the Iron Mould Coated Sand is 6-8mm；The temperature of cast is
1380-1400℃；The time of the cast is 23-28s；The cast can not need rising head.The piston that the present invention is produced
Ring meets performance requirement, and dimensional accuracy with foundry goods is high, and allowance is little, and foundry goods yield rate is high, the advantages of production efficiency is high.
But the patent application does not disclose the concrete technology system about compound casting.
Chinese invention patent application 201410411068.9 (date of publication 2014.11.5) discloses a kind of Sand-Faced Metal Mould Casting
The casting technique of spheroidal graphite cast-iron hinge ear, then the technique passed through by design and the on all four master mold of hinge ear shape and swage
Penetrating sand machine produces the upper and lower swage die cavity for covering sand for covering layer of sand with 6-8mm, finally according to charger sheet by the qualified iron that makes
Water is poured in the lumen type after mould assembling, to be cast after the completion of, unpack obtain casting hinge ear part.The Sand-Faced Metal Mould Casting technique is relatively
The hinge ear of traditional forged steel material, production cost can reduce by 35%, save the cost such as plenty of time and manpower, equipment, while having
Effect improves production efficiency and castability, reduces casting wasted product rate, and this is simple for process, wide market, warp
Ji remarkable benefit, is suitable for overwhelming majority enterprise and uses.But the patent application does not disclose the concrete technology body about compound casting
System.
Chinese invention patent application 201410544297.8 (date of publication 2015.1.21) discloses a kind of casting of device for sand coated iron mould
Technique, belong to casting technology field；Technical problem to be solved is to provide a kind of casting dimension accuracy height, surface smoothness
The high and less iron die sand casting process of deflection；Using technical scheme be：By the pouring temperature for controlling molten iron it is
1450 DEG C -1600 DEG C, the duration of pouring reduces the stress deformation of foundry goods less than 60 seconds and some other process conditions, adopts
The axle housing foundry goods of the technical process manufacture of the present invention, surface smoothness, dimensional accuracy are high, and deflection is little.
Content of the invention
The brief overview being given below with regard to the present invention, to provide the basic reason with regard to certain aspects of the invention
Solution.It should be appreciated that this general introduction is not the exhaustive general introduction with regard to the present invention.It is not intended to determine the key of the present invention
Or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form, with
This is used as the preamble in greater detail that discusses after a while.
The present invention provides a kind of preparation method of aluminium bronze composite casting valve plate, and its preparation method is made up of following steps：
Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；
Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms casting type
Chamber；The group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%, iron 0.45-0.50%,
Manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-0.45%, lead 0.01-
0.02%, balance of copper；
Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；
Step 4, takes foundry goods, cooling, and ball blast finishing obtains final product the preparation method of aluminium bronze composite casting valve plate.
Compared with prior art, the present invention has following beneficial effect：In the composite casting valve plate of the present invention, copper fusing point
For 1084 DEG C, boiling point is 2567 DEG C；The fusing point of iron copper differs from 500 DEG C or so, and therefore the temperature of precise control molten iron casting has extremely
Close important meaning；In order to ensure the quality of composite casting valve plate, it is ensured that exact position of the copper sheathing in foundry goods is also to be cast as
The place of work(key.The compound casting precision that the method for the present invention makes is high, copper sheathing accurate positioning；While present invention employs
Pouring in vertically clamped moulds, shortens the duration of pouring, realizes the temperature difference of precise control molten metal, and effectively solving copper sheathing is fixing tired in die cavity
Difficulty, in casting process, copper sheathing easily off normal and foundry goods are also easy to produce the technical problem of gas hole defect；Using the preparation technology of the present invention,
The qualification rate of compound casting can be to more than 96%, and the technique of the present invention solves prior art long felt mass production
Technical barrier.
Specific embodiment
Embodiments of the invention addressed below.The element for describing in one embodiment of the invention and feature permissible
Combine with the element illustrated in one or more other embodiments and feature.It should be noted that for purposes of clarity, say
Expression and the description of unrelated to the invention, part known to persons of ordinary skill in the art and process is eliminated in bright.
Embodiment 1
The present embodiment is related to a kind of preparation method of aluminium bronze composite casting valve plate, and the preparation method is by following steps group
Become：
Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；
Described injecting uses penetrating sand machine, and the Stress control of penetrating sand machine is 0.7Mpa；The temperature control of penetrating sand machine is 205 DEG C；Penetrate sand
It is 4 times that the number of times of sand penetrated by machine, and the interval time for penetrating sand every time is 4 seconds；Before injecting valve plate die cavity, valve plate die cavity is heated
It it is 175 DEG C to temperature；The insulation is specially：Keeping temperature is 186 DEG C, and the time is 15 seconds；The valve plate die cavity be provided with
The inner core that copper sheathing coordinates；
Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms casting type
Chamber；The group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%, iron 0.45-0.50%,
Manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-0.45%, lead 0.01-
0.02%, balance of copper；
Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；The temperature of the iron liquid is 1450
℃；The cast is specially：Place cup to be poured into a mould, using pouring in vertically clamped moulds mode, casting ladle apart from the height of cup is
9cm；The time of the cast is 10 seconds；It is calculated in mass percent, in the iron liquid, carbon≤3.2%, silicon≤1.8%, manganese≤
0.3%；
Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.
The effect of the present embodiment is：Arenaceous shell type composite casting valve plate qualification rate of covering manufactured in the present embodiment reaches 96%, by
In the problem for controlling iron liquid, using pouring in vertically clamped moulds, control the duration of pouring so that copper sheathing position is accurate in foundry goods, gas in foundry goods
Hole defect is overcome so that foundry goods can mass production, solve the technology of prior art long felt mass production
A difficult problem.
Embodiment 2
The present embodiment is related to a kind of preparation method of aluminium bronze composite casting valve plate, and the preparation method is by following steps group
Become：
Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；
Described injecting uses penetrating sand machine, and the Stress control of penetrating sand machine is 1.0Mpa；The temperature control of penetrating sand machine is 225 DEG C；Penetrate sand
It is 4 times that the number of times of sand penetrated by machine, and the interval time for penetrating sand every time is 5 seconds；Before injecting valve plate die cavity, valve plate die cavity is heated
It it is 185 DEG C to temperature；The insulation is specially：Keeping temperature is 195 DEG C, and the time is 25 seconds；The valve plate die cavity be provided with
The inner core that copper sheathing coordinates；
Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms casting type
Chamber；The group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%, iron 0.45-0.50%,
Manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-0.45%, lead 0.01-
0.02%, balance of copper；
Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；The temperature of the iron liquid is 1500
℃；The cast is specially：Place cup to be poured into a mould, using pouring in vertically clamped moulds mode, casting ladle apart from the height of cup is
12cm；The time of the cast is 50 seconds；It is calculated in mass percent, in the iron liquid, carbon≤3.2%, silicon≤1.8%, manganese≤
0.3%；
Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.
The effect of the present embodiment is：Arenaceous shell type composite casting valve plate qualification rate of covering manufactured in the present embodiment reaches 97%, by
In the problem for controlling iron liquid, using pouring in vertically clamped moulds, control the duration of pouring so that copper sheathing position is accurate in foundry goods, gas in foundry goods
Hole defect is overcome so that foundry goods can mass production, solve the technology of prior art long felt mass production
A difficult problem.
Embodiment 3
The present embodiment is related to a kind of preparation method of aluminium bronze composite casting valve plate, and the preparation method is by following steps group
Become：
Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；
Described injecting uses penetrating sand machine, and the Stress control of penetrating sand machine is 0.8Mpa；The temperature control of penetrating sand machine is 220 DEG C；Penetrate sand
It is 4 times that the number of times of sand penetrated by machine, and the interval time for penetrating sand every time is 4 seconds；Before injecting valve plate die cavity, valve plate die cavity is heated
It it is 180 DEG C to temperature；The insulation is specially：Keeping temperature is 190 DEG C, and the time is 20 seconds；The valve plate die cavity be provided with
The inner core that copper sheathing coordinates；
Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms casting type
Chamber；The group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%, iron 0.45-0.50%,
Manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-0.45%, lead 0.01-
0.02%, balance of copper；
Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；The temperature of the iron liquid is 1480
℃；The cast is specially：Place cup to be poured into a mould, using pouring in vertically clamped moulds mode, casting ladle apart from the height of cup is
11cm；The time of the cast is 33 seconds；It is calculated in mass percent, in the iron liquid, carbon≤3.2%, silicon≤1.8%, manganese≤
0.3%；
Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.
The effect of the present embodiment is：Arenaceous shell type composite casting valve plate qualification rate of covering manufactured in the present embodiment reaches 98%, by
In the problem for controlling iron liquid, using pouring in vertically clamped moulds, control the duration of pouring so that copper sheathing position is accurate in foundry goods, gas in foundry goods
Hole defect is overcome so that foundry goods can mass production, solve the technology of prior art long felt mass production
A difficult problem.
In general, the preparation method of the present invention is made up of following steps：Step one, takes precoated sand and injects valve plate die cavity,
Insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould
On, mould assembly vertical clamping, form cast die cavity afterwards；The group of the copper sheathing is divided into aluminium bronze, the component tool of the aluminium bronze
Body is：Aluminium 5.5-10.2%, iron 0.45-0.50%, manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin
0.03-0.08%, nickel 0.31-0.45%, lead 0.01-0.02%, balance of copper；Step 3, takes iron liquid, afterwards by iron liquid casting
To in cast die cavity, foundry goods is obtained；Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.
Preferably, in step one, described injecting uses penetrating sand machine, and the Stress control of penetrating sand machine is 07Mpa-
1.0Mpa.Preferably, in step one, the temperature control of penetrating sand machine is 205-225 DEG C.Preferably, in step one, penetrate
It is 4 times that the number of times of sand penetrated by sand machine, and the interval time for penetrating sand every time is the 4-5 second.Preferably, in step one, valve plate mould is injected
Before chamber, valve plate die cavity is carried out being heated to temperature for 175-185 DEG C.Preferably, in step one, the insulation is concrete
For：Keeping temperature is 186-195 DEG C, and the time is the 15-25 second.The shape of the handling process for resin-coated sand shell mould of sand is penetrated in the present invention
Become with vital effect, the setting of these parameters and follow-up iron liquid component, heating-up temperature, pouring type, the group of copper sheathing
Grading has directly impact, and all of parametric synthesis forms a complete technical system, and the final lifting present invention that realizes is covered
The technique effect of arenaceous shell type composite casting valve plate qualification rate.
Preferably, in step one, the valve plate die cavity is provided with the inner core coordinated with copper sheathing.The setting of inner core, makes
After sand must being penetrated, resin-coated sand shell mould is internally formed the inner core matched with copper sheathing, is easy to follow-up copper sheathing to fix, efficiently solves type
Fixing difficult in chamber, and in casting process copper sheathing easily off normal technical problem, be obviously improved the conjunction of production efficiency and product
Lattice rate.
In the present invention, the group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%,
Iron 0.45-0.50%, manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-
0.45%, lead 0.01-0.02%, balance of copper；The intensity of aluminium bronze is high compared with tin bronze, and preferably, aluminium is blue or green for high temperature oxidation resistance
Copper has higher intensity, good anti-wear performance.The aluminium bronze of specific components is selected in the present invention, is joined with the iron liquid of specific components
Close, processed using specific processing parameter in each step of the present invention, and then could the excellent composite casting valve of forming properties
Plate.
Preferably, in step 3, the temperature of the iron liquid is 1450-1500 DEG C；The cast is specially：Placement is poured
Cup is poured into a mould, and using pouring in vertically clamped moulds mode, casting ladle is 9-12cm apart from the height of cup；The time of the cast is
The 10-50 second.Preferably, in step 3, it is calculated in mass percent, in the iron liquid, carbon≤3.2%, silicon≤1.8%, manganese
≤ 0.3%.The selection of iron liquid component has vital effect for the control of temperature, selects suitable iron liquid group in the present invention
Point, control the temperature of iron liquid, effectively shorten the stand-by period before cast, reduce degree of the iron liquid by external environment oxidation, while
The height of control cast and the duration of pouring, can effectively shorten the duration of pouring further, the temperature difference of precise control iron liquid is realized,
Effectively solving copper sheathing is fixing difficult in die cavity, and in casting process, copper sheathing easily off normal and foundry goods are also easy to produce the technology of gas hole defect
Problem.
In sum, in the composite casting valve plate of the present invention, copper fusing point is 1084 DEG C, and boiling point is 2567 DEG C；Iron copper molten
Point differs from 500 DEG C or so, and therefore the temperature of precise control molten iron casting has vital meaning；In order to ensure composite casting valve
The quality of plate, it is ensured that exact position of the copper sheathing in foundry goods is also the place for casting successfully key.The method of the present invention makes
Compound casting precision is high, copper sheathing accurate positioning；While pouring in vertically clamped moulds is present invention employs, shorten the duration of pouring, realize accurate
The temperature difference of control molten metal, effectively solving copper sheathing are fixing difficult in die cavity, copper sheathing easily off normal and foundry goods in casting process
It is also easy to produce the technical problem of gas hole defect；Using the preparation technology of the present invention, the qualification rate of compound casting can be to more than 95%, this
The technique of invention solves the technical barrier of prior art long felt mass production.
Finally it should be noted that：Above example only in order to technical scheme to be described, rather than a limitation；Although
With reference to the foregoing embodiments the present invention is described in detail, it will be understood by those within the art that：Which still may be used
To modify to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (9)
1. a kind of preparation method of aluminium bronze composite casting valve plate, it is characterised in that the preparation method is made up of following steps：
Step one, takes precoated sand and injects valve plate die cavity, and insulation is so that precoated sand curing molding, molding, obtain resin-coated sand shell mould；
The valve plate die cavity is provided with the inner core coordinated with copper sheathing；
Step 2, copper sheathing is fixed on the inner core of resin-coated sand shell mould, afterwards mould assembly vertical clamping, forms cast die cavity；
The group of the copper sheathing is divided into aluminium bronze, and the component of the aluminium bronze is specially：Aluminium 5.5-10.2%, iron 0.45-0.50%,
Manganese 1.5-1.8%, silicon 0.05-0.09%, zinc 0.56-0.87%, tin 0.03-0.08%, nickel 0.31-0.45%, lead 0.01-
0.02%, balance of copper；
Step 3, takes iron liquid, afterwards by iron liquid casting in cast die cavity, obtains foundry goods；
Step 4, takes foundry goods, cooling, and ball blast finishing is obtained final product and covers arenaceous shell type composite casting valve plate.
2. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step one, institute
State to inject and penetrating sand machine is used, the Stress control of penetrating sand machine is 0.7Mpa-1.0Mpa.
3. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step one, penetrate
The temperature control of sand machine is 205-225 DEG C.
4. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step one, penetrate
It is 4 times that the number of times of sand penetrated by sand machine, and the interval time for penetrating sand every time is the 4-5 second.
5. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step one, penetrate
Before entering valve plate die cavity, valve plate die cavity is carried out being heated to temperature for 175-185 DEG C.
6. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step one, institute
State insulation to be specially：Keeping temperature is 186-195 DEG C, and the time is the 15-25 second.
7. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step 3, institute
The temperature for stating iron liquid is 1450-1500 DEG C.
8. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that the cast is concrete
For：Place cup to be poured into a mould, using pouring in vertically clamped moulds mode, casting ladle is 9-12cm apart from the height of cup；The cast
Time be the 10-50 second.
9. the preparation method of aluminium bronze composite casting valve plate according to claim 1, it is characterised in that in step 3, with
Mass percentage, in the iron liquid, carbon≤3.2%, silicon≤1.8%, manganese≤0.3%.
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| CN109351948B (en) * | 2018-11-01 | 2020-07-03 | 苏州市海威特铸造厂 | Casting process of copper-iron insert casting |
| CN109930017A (en) * | 2019-04-15 | 2019-06-25 | 中北大学 | A kind of preparation method of high strength copper alloy |
| CN110695342A (en) * | 2019-11-29 | 2020-01-17 | 南京宝泰特种材料股份有限公司 | Casting mold and casting method for bimetal impeller shell |
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| CN101954466B (en) * | 2010-11-02 | 2015-09-02 | 北京中煤矿山工程有限公司 | Centrifugal casting process for shell of bimetal compound metallurgical wedge hob |
| CN201900246U (en) * | 2010-12-10 | 2011-07-20 | 中国第一汽车集团公司 | Casted aluminum cylinder body sand core structure for positioning of hot cylinder sleeve |
| CN104190866B (en) * | 2014-08-18 | 2016-06-08 | 宁国市四方钢球模具设备有限公司 | A kind of bimetallic alloy hammer precoated sand manufacture method |
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