CN105750476B - A kind of extraordinary precoated sand of anti-aliquation and preparation method thereof - Google Patents
A kind of extraordinary precoated sand of anti-aliquation and preparation method thereof Download PDFInfo
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- CN105750476B CN105750476B CN201610272096.6A CN201610272096A CN105750476B CN 105750476 B CN105750476 B CN 105750476B CN 201610272096 A CN201610272096 A CN 201610272096A CN 105750476 B CN105750476 B CN 105750476B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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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
Abstract
The present invention provides a kind of extraordinary precoated sand and preparation method thereof of anti-aliquation, the special type precoated sand includes the following raw material: roughing sand, phenolic resin, iron oxide, methenamine aqueous solution, calcium stearate, the roughing sand is made of reclaimed sand, nice foundry sand, the quality of phenolic resin is the 2.5% ~ 2.7% of roughing sand quality, the quality of iron oxide is the 0.5% ~ 0.7% of roughing sand quality, the quality of methenamine aqueous solution is the 14% ~ 17% of phenolic resin quality, and the quality of calcium stearate is the 7% ~ 8% of phenolic resin quality.The present invention breaks the formula components and ratio of original precoated sand, add suitable nice foundry sand with preferable mobility and heat transmitting, reduce resin content, add suitable brown iron oxide, it is substantially reduced the incidence of nitrogen pore, water jacket mud core made from existing precoated sand is efficiently solved and is easy the problems such as aliquation, deformation and its casting are easy to produce nitrogen pore, overlap, burr.
Description
Technical field
The present invention relates to casting technology fields, more particularly to a kind of extraordinary precoated sand and preparation method thereof of anti-aliquation.
Background technique
Precoated sand is mainly used for the mud core manufacture of hot core technique, and mud core is then used for the casting of mechanical part, the property of mud core
The component and preparation method thereof of precoated sand can be then depended on, when existing mud core is cast for engine, mud wicking surface is loose, holds
Easy aliquation, the engine qualification rate cast out is low, is easy to appear burr, or even deformation, and generate a large amount of nitrogen pore, seriously
Influence casting quality.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of extraordinary precoated sands of anti-aliquation
And preparation method thereof, for solving the easy aliquation of water jacket mud core made of precoated sand in the prior art, cylinder body is also easy to produce nitrogen pore etc.
Problem.
In order to achieve the above objects and other related objects, first aspect present invention provides a kind of extraordinary overlay film of anti-aliquation
Sand, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine aqueous solution, calcium stearate, the roughing sand is by regenerating
Sand, nice foundry sand composition, the quality of phenolic resin are the 2.5%~2.7% of roughing sand quality, and the quality of iron oxide is roughing sand quality
0.5%~0.7%, the quality of methenamine aqueous solution is the 14%~17% of phenolic resin quality, and the quality of calcium stearate is
The 7%~8% of phenolic resin quality.
Further, it is 20%~25% that the quality of the nice foundry sand, which accounts for the mass ratio of roughing sand,.
Preferably, the granularity of the nice foundry sand is 50~140 mesh, nice foundry sand also known as capacitance ceramic, treasure pearl sand etc..
It is highly preferred that the granularity of the nice foundry sand is 60~80 mesh.
Preferably, the granularity of the reclaimed sand is 50~100 mesh, and reclaimed sand is thermal reclamation sand herein.
It is highly preferred that the granularity of the reclaimed sand is 60~75 mesh.
Preferably, the mass ratio of methenamine and water is 1:3.5-4.5 in the methenamine aqueous solution.
It is highly preferred that the mass ratio of methenamine and water is 1:4 in the methenamine aqueous solution.
Second aspect of the present invention provides the preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation, includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, heating；
(2) phenolic resin, iron oxide, mixed grind overlay film is added by formula ratio；
(3) methenamine aqueous solution, mixed grind is added by formula ratio；
(4) air-cooled；
(5) calcium stearate, mixed grind is added by formula ratio；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Further, roughing sand is heated to 130-150 DEG C in the step (1)；The time of mixed grind overlay film in the step (2)
It is 50-80 seconds.
Further, the mixed grind time is 10-15 seconds in the step (3)；Step (4) the apoplexy cool time is 30-60
Second, it is air-cooled to 100~110 DEG C when can control temperature；The mixed grind time is 10-30 seconds in the step (5).
As described above, the extraordinary precoated sand of anti-aliquation and preparation method thereof of the invention, have the advantages that in order to
Solution mud core aliquation and the engine of casting are also easy to produce the defect of nitrogen pore, by investigating and analyzing hot core technique mud core further
The genesis mechanism of " aliquation " and nitrogen pore, on the basis of existing coated sand technology, precoated sand of the present invention is carried out at four aspects
Promoted: the first, promoting the mobility of precoated sand, can when penetrating sand Fast Filling consolidation；The second, precoated sand is promoted
Heat transmitting, resin is fast from cured transmitting hot in the process is softened to, and mud core be made to have little time to be layered with regard to solidifying；Third is being protected
Under the premise of demonstrate,proving intensity, the additional amount of resin is reduced, volume shared by resin becomes smaller between such sand grains, can reduce the solidification of mud core
Volume in the process reduces tendency；4th, the auxiliary material that addition prevents casting nitrogen pore from occurring.It is wanted based on the promotion of aforementioned four index
It asks, researcher and producers grope through the test of more rounds, successfully have developed extraordinary precoated sand of the invention, the special type overlay film
Sand breaks the formula components and ratio of original precoated sand, adds suitable nice foundry sand with preferable mobility and heat transmitting,
Nice foundry sand is expensive, therefore, it is necessary to proper amount of nice foundry sand is added under the premise of precoated sand can reach required performance,
Production cost is controlled, also, the present invention reduces resin content, adds suitable brown iron oxide, hence it is evident that reduce the hair of nitrogen pore
Raw rate.
It is summarized according to production application and a large amount of experimental analysis, present invention special type precoated sand successfully solves 6U cylinder
Lid water jacket mud core " aliquation " problem, is widely portable to thermal method core manufacturing craft, expert's field evaluation is qualified, powerful support 6U cylinder
The normal production of lid, also, the extraordinary precoated sand of the present invention is suitable for the manufacture of cylinder body class water jacket mud core, solves 6U cylinder body water jacket
The problems such as built-in fitting deformation and cylinder body nitrogen hole defect.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Embodiment 1
A kind of extraordinary precoated sand of anti-aliquation, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine are water-soluble
Liquid, calcium stearate, roughing sand are made of that (nice foundry sand that the present embodiment uses is purchased from the fine haydite of the auspicious treasure in Luoyang reclaimed sand, nice foundry sand
The granularity of Products Co., Ltd, nice foundry sand is selected according to product surface roughness), the quality of nice foundry sand accounts for the quality of roughing sand
Than being 20%, the granularity of nice foundry sand is 50 mesh, and the granularity of reclaimed sand is 50 mesh, and the quality of phenolic resin is roughing sand quality
2.5%, the quality of iron oxide is the 0.5% of roughing sand quality, and the quality of methenamine aqueous solution is the 14% of phenolic resin quality,
The mass ratio of methenamine and water is 1:3.5 in methenamine aqueous solution, and the quality of calcium stearate is phenolic resin quality
7%.
The preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, is heated to 130 DEG C；
(2) by formula ratio be added phenolic resin, iron oxide, mixed grind overlay film 50 seconds；
(3) by formula ratio be added methenamine aqueous solution, mixed grind 10 seconds；
(4) air blower is opened, revolving speed 2900r/min, air-cooled 30 seconds；
(5) by formula ratio be added calcium stearate, mixed grind 10 seconds；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Embodiment 2
A kind of extraordinary precoated sand of anti-aliquation, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine are water-soluble
Liquid, calcium stearate, roughing sand are made of that (nice foundry sand that the present embodiment uses is purchased from the fine haydite of the auspicious treasure in Luoyang reclaimed sand, nice foundry sand
The granularity of Products Co., Ltd, nice foundry sand is selected according to product surface roughness), the quality of nice foundry sand accounts for the quality of roughing sand
Than being 21%, the granularity of nice foundry sand is 60 mesh, and the granularity of reclaimed sand is 60 mesh, and the quality of phenolic resin is roughing sand quality
2.6%, the quality of iron oxide is the 0.5% of roughing sand quality, and the quality of methenamine aqueous solution is the 15% of phenolic resin quality,
The mass ratio of methenamine and water is 1:3.5 in methenamine aqueous solution, and the quality of calcium stearate is phenolic resin quality
7%.
The preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, is heated to 135 DEG C；
(2) by formula ratio be added phenolic resin, iron oxide, mixed grind overlay film 60 seconds；
(3) by formula ratio be added methenamine aqueous solution, mixed grind 12 seconds；
(4) air blower is opened, revolving speed 2900r/min, air-cooled 35 seconds；
(5) by formula ratio be added calcium stearate, mixed grind 15 seconds；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Embodiment 3
A kind of extraordinary precoated sand of anti-aliquation, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine are water-soluble
Liquid, calcium stearate, roughing sand are made of that (nice foundry sand that the present embodiment uses is purchased from the fine haydite of the auspicious treasure in Luoyang reclaimed sand, nice foundry sand
The granularity of Products Co., Ltd, nice foundry sand is selected according to product surface roughness), the quality of nice foundry sand accounts for the quality of roughing sand
Than being 22%, the granularity of nice foundry sand is 75 mesh, and the granularity of reclaimed sand is 65 mesh, and the quality of phenolic resin is roughing sand quality
2.6%, the quality of iron oxide is the 0.7% of roughing sand quality, and the quality of methenamine aqueous solution is the 15% of phenolic resin quality,
The mass ratio of methenamine and water is 1:4 in methenamine aqueous solution, and the quality of calcium stearate is phenolic resin quality
7.5%.
The preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, is heated to 140 DEG C；
(2) by formula ratio be added phenolic resin, iron oxide, mixed grind overlay film 70 seconds；
(3) by formula ratio be added methenamine aqueous solution, mixed grind 13 seconds；
(4) air blower is opened, revolving speed 2900r/min, air-cooled 40 seconds；
(5) by formula ratio be added calcium stearate, mixed grind 20 seconds；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Embodiment 4
A kind of extraordinary precoated sand of anti-aliquation, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine are water-soluble
Liquid, calcium stearate, roughing sand are made of that (nice foundry sand that the present embodiment uses is purchased from the fine haydite of the auspicious treasure in Luoyang reclaimed sand, nice foundry sand
The granularity of Products Co., Ltd, nice foundry sand is selected according to product surface roughness), the quality of nice foundry sand accounts for the quality of roughing sand
Than being 24%, the granularity of nice foundry sand is 80 mesh, and the granularity of reclaimed sand is 75 mesh, and the quality of phenolic resin is roughing sand quality
2.7%, the quality of iron oxide is the 0.6% of roughing sand quality, and the quality of methenamine aqueous solution is the 16% of phenolic resin quality,
The mass ratio of methenamine and water is 1:4 in methenamine aqueous solution, and the quality of calcium stearate is phenolic resin quality
7.5%.
The preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, is heated to 145 DEG C；
(2) by formula ratio be added phenolic resin, iron oxide, mixed grind overlay film 75 seconds；
(3) by formula ratio be added methenamine aqueous solution, mixed grind 14 seconds；
(4) air blower is opened, revolving speed 2900r/min, air-cooled 50 seconds；
(5) by formula ratio be added calcium stearate, mixed grind 25 seconds；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Embodiment 5
A kind of extraordinary precoated sand of anti-aliquation, including the following raw material: roughing sand, phenolic resin, iron oxide, methenamine are water-soluble
Liquid, calcium stearate, roughing sand are made of that (nice foundry sand that the present embodiment uses is purchased from the fine haydite of the auspicious treasure in Luoyang reclaimed sand, nice foundry sand
The granularity of Products Co., Ltd, nice foundry sand is selected according to product surface roughness), the quality of nice foundry sand accounts for the quality of roughing sand
Than being 25%, the granularity of nice foundry sand is 140 mesh, and the granularity of reclaimed sand is 100 mesh, and the quality of phenolic resin is roughing sand quality
2.7%, the quality of iron oxide is the 0.7% of roughing sand quality, and the quality of methenamine aqueous solution is the 17% of phenolic resin quality,
The mass ratio of methenamine and water is 1:4.5 in methenamine aqueous solution, and the quality of calcium stearate is phenolic resin quality
8%.
The preparation method of the extraordinary precoated sand of above-mentioned anti-aliquation includes the following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, is heated to 150 DEG C；
(2) by formula ratio be added phenolic resin, iron oxide, mixed grind overlay film 80 seconds；
(3) by formula ratio be added methenamine aqueous solution, mixed grind 15 seconds；
(4) air blower is opened, revolving speed 2900r/min, air-cooled 60 seconds；
(5) by formula ratio be added calcium stearate, mixed grind 30 seconds；
(6) go out to grind, the extraordinary precoated sand finished product is made.
Control experiment
Reclaimed sand is heated to 120-170 DEG C, 3% phenolic resin that quality is reclaimed sand quality, mixed grind overlay film is added
50-80 seconds, be added quality be phenolic resin quality 13% methenamine aqueous solution (mass ratio of methenamine and water be 1:
4), mixed grind 10-15 seconds, 30-60 seconds air-cooled, be added quality be phenolic resin quality 6% calcium stearate, mixed grind 10-30 seconds,
It grinds out, common precoated sand finished product is made.
Product testing experiment
The precoated sand production mud core of above-mentioned five embodiments and control group is respectively adopted, respectively produces 7 batches, every batch of
Produce 120 products.
The mud core of sampling observation is splitted, measurement crust thickness, observation lamination.
1 mud core delamination of table and crust thickness statistical form
Note: the accounting in table 1 refers to the accounting of mud chipware number that appearance is layered in the mud chipware number of dissection
It will be obvious that from upper table 1, the 4200 mud cores produced using embodiment 1-5, dissect 210, dissection mud core is not
There is lamination, measurement crust thickness is all larger than 7mm, and specific range meets quality requirement in 7.5-8.1mm.
There is the case where overlap, burr statistical form in 2 engine cylinder cover of table
As can be seen from Table 2, check that cylinder cover water jacket mud core is easily layered position, embodiment 1-5 is not divided due to mud core
Layer phenomenon, casting do not occur overlap, burr, and the casting fin of common precoated sand production, burr every have, cleaning is tired
Difficulty is difficult to clean up completely, there are hidden danger of quality, seriously affect fraction defective since overlap, burr are generated in core cavity.
The cylinder barrel of 3 engine cylinder body of table (4JB1/4KH1 cylinder body) generates the case where nitrogen pore statistical form
Cylinder body cylinder barrel nitrogen pore: after cylinder barrel processing, it is nitrogen pore that there are the stomatas of needle-like on cylinder barrel wall.Upper table 3
Data are that number of packages occurs for the nitrogen pore counted after processing.As can be seen from Table 3, the cylinder body nitrogen manufactured using embodiment 1-5
For hole proportion well below the proportion of control group nitrogen pore, the present invention efficiently solves the problems, such as nitrogen pore, hence it is evident that reduces
The engine cylinder body number of packages of nitrogen pore occurs.
4 engine cylinder body of table (4KH1/6U cylinder body) water jacket deformation statistical form
Cylinder body water jacket of engine mud core in table 4, there are built-in fittings for inside, and this kind of cylinder body water jacket of engine becomes in order to prevent
Shape, it is higher to the mud core requirement of precoated sand and its manufacture, as can be seen from Table 4, the engine cylinder manufactured using embodiment 1-5
Body water jacket does not find the phenomenon that deforming, and control group has 15 deformations, and therefore, the present invention has better anti-deformation effect,
Efficiently solve the problems, such as that cylinder body water jacket of engine is easily-deformable, especially to the cylinder body water jacket of engine with built-in fitting, this hair
Bright anti-deformation effect becomes apparent from.
Performance detection is carried out to the existing precoated sand of extraordinary precoated sand of the invention and control group, Testing index includes bending resistance
Intensity, fusing point, tensile strength, hot tensile strength, gas forming amount etc., testing result is as follows:
The performance test results statistical form of the extraordinary precoated sand of 5 present invention of table
The performance detection statistical form of the existing precoated sand of 6 control group of table
From upper table 5 with table 6 it is found that extraordinary precoated sand of the invention, indices value is within specification value, in bending resistance
In the case where being superior to common precoated sand performance in terms of intensity and tensile strength, gas forming amount is lower than common precoated sand, reduces mud
The gas forming amount of core thereby reduces the proportion of bleb.
In conclusion the present invention is widely used in precoated sand thermal method core manufacturing craft, break the formula components of original precoated sand
And ratio, suitable nice foundry sand with preferable mobility and heat transmitting is added, resin content is reduced, adds suitable oxygen
Change iron powder, reduce the incidence of nitrogen pore, efficiently solve water jacket mud core made from existing precoated sand be easy aliquation, deformation and its
Casting is easy to produce the problems such as nitrogen pore, overlap, burr.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (8)
1. a kind of extraordinary precoated sand of anti-aliquation, which is characterized in that including the following raw material: roughing sand, phenolic resin, iron oxide, crow
Lip river tropine aqueous solution, calcium stearate, the roughing sand are made of reclaimed sand, nice foundry sand, and the quality of phenolic resin is roughing sand quality
2.5%~2.7%, the quality of iron oxide is the 0.5%~0.7% of roughing sand quality, and the quality of methenamine aqueous solution is phenolic aldehyde
The 14%~17% of resin quality, the quality of calcium stearate are the 7%~8% of phenolic resin quality, the quality of the nice foundry sand
The mass ratio for accounting for roughing sand is 20%~25%；The mass ratio of methenamine and water is 1:3.5- in the methenamine aqueous solution
4.5。
2. the extraordinary precoated sand of anti-aliquation according to claim 1, it is characterised in that: the granularity of the nice foundry sand be 50~
140 mesh.
3. the extraordinary precoated sand of anti-aliquation according to claim 2, it is characterised in that: the granularity of the nice foundry sand be 60~
80 mesh.
4. the extraordinary precoated sand of anti-aliquation according to claim 1, it is characterised in that: the granularity of the reclaimed sand be 50~
100 mesh.
5. the extraordinary precoated sand of anti-aliquation according to claim 4, it is characterised in that: the granularity of the reclaimed sand be 60~
75 mesh.
6. the preparation method of the extraordinary precoated sand of anti-aliquation according to claim 1-5, which is characterized in that including
Following steps:
(1) reclaimed sand, nice foundry sand are mixed by formula ratio, heating；
(2) phenolic resin, iron oxide, mixed grind overlay film is added by formula ratio；
(3) methenamine aqueous solution, mixed grind is added by formula ratio；
(4) air-cooled；
(5) calcium stearate, mixed grind is added by formula ratio；
(6) go out to grind, the extraordinary precoated sand finished product is made.
7. the preparation method of the extraordinary precoated sand of anti-aliquation according to claim 6, it is characterised in that: the step (1)
Middle roughing sand is heated to 130-150 DEG C；The time of mixed grind overlay film is 50-80 seconds in the step (2).
8. the preparation method of the extraordinary precoated sand of anti-aliquation according to claim 6, it is characterised in that: the step (3)
The middle mixed grind time is 10-15 seconds；Step (4) the apoplexy cool time is 30-60 seconds；The mixed grind time is 10- in the step (5)
30 seconds.
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| CN106077498A (en) * | 2016-08-15 | 2016-11-09 | 合肥江淮铸造有限责任公司 | A kind of core manufacturing craft of diesel engine cylinder block |
| CN107745068B (en) * | 2017-11-05 | 2019-10-18 | 中北大学 | A kind of laser 3D printing precoated sand and preparation method thereof |
| CN108380814A (en) * | 2018-05-05 | 2018-08-10 | 侯马市富达造型材料有限公司 | A kind of regeneration precoated sand and preparation method thereof of casting swage part |
| CN108746475A (en) * | 2018-08-08 | 2018-11-06 | 重庆长江造型材料（集团）股份有限公司 | A kind of coated sand and preparation method thereof |
| CN113770298A (en) * | 2021-07-29 | 2021-12-10 | 无锡正杰机械科技有限公司 | Low-gas-evolution precoated sand for casting sand mold of turbine shell |
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| CN102069140A (en) * | 2011-02-16 | 2011-05-25 | 西峡县众德汽车部件有限公司 | Novel film coating sand |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN104785709A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Precoated sand for casting and preparation method thereof |
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|---|---|---|---|---|
| JPS5284124A (en) * | 1976-01-06 | 1977-07-13 | Mitsubishi Heavy Ind Ltd | Mold manufacturing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069140A (en) * | 2011-02-16 | 2011-05-25 | 西峡县众德汽车部件有限公司 | Novel film coating sand |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN104785709A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Precoated sand for casting and preparation method thereof |
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