CN107214292A - A kind of moulding sand for casting and preparation method thereof - Google Patents
A kind of moulding sand for casting and preparation method thereof Download PDFInfo
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- CN107214292A CN107214292A CN201710510154.9A CN201710510154A CN107214292A CN 107214292 A CN107214292 A CN 107214292A CN 201710510154 A CN201710510154 A CN 201710510154A CN 107214292 A CN107214292 A CN 107214292A
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- moulding sand
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Classifications
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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
-
- 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/167—Mixtures of inorganic and organic binding agents
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of moulding sand for casting, belong to molding sand technical field, include the raw material of following parts by weight：80 90 parts of silica flour, 20 26 parts of bentonite, 15 17 parts of glass-cermic powder, 12 14 parts of flyash, 79 parts of steel fibre, 14 18 parts of glass fibre, 10 15 parts of furane resins, 47 parts of inositol hexaphosphate, 12 parts of silicone oil, 46 parts of starch, 12 parts of coupling agent, 24 parts of curing agent, 15 18 parts of water；The invention also discloses a kind of preparation method of moulding sand for casting；Good mechanical property of the present invention, with preferably heat-resisting ability, heat endurance is good.
Description
Technical field
The present invention relates to molding sand technical field, specifically, a kind of moulding sand for casting and preparation method thereof relate to.
Background technology
Molding sand is used for the material of moulding in casting.Molding sand is general by Foundry sand, moulding sand binder and additional thing etc.
Modeling Material is mixed according to a certain percentage.Molding sand presses binding agent difference used, can be divided into clay-bonded sand, water-glass sand, cement
Sand, resin sand etc..With the most of clay-bonded sand, water-glass sand and resin sand.
Effect of the molding sand in Foundry Production is particularly important, because the poor quality of molding sand and caused by casting wasted product account for casting
The 30~50% of the total waste product of part.Requirement generally to molding sand is：1. there is higher intensity and heat endurance, it is various outer to bear
The effect of power and high temperature.2. the energy that good mobility, i.e. molding sand are mutually shifted under external force or Action of Gravity Field itself between sand grains
Power.3. certain plasticity, i.e. molding sand are deformed under external force, and the energy of given shape can be kept after external force is removed
Power.4. preferable gas permeability, i.e. molding sand hole pass through the ability of gas.5. high collapsibility, also known as knockability, i.e., solidifying in casting
Gu whether rear molding sand is easily destroyed, if the performance easily removed from casting.
But the heat-resisting ability of current molding sand is limited, cause heat endurance not enough, quality is not good；And current casting
Field is quickly grown, higher for the performance requirement of steel-casting and ironcasting, thus it requires the further items of lifting molding sand
Energy.
In Publication No. CN104057018A patent document, a kind of moulding sand for casting is disclosed, by following parts by weight
Raw material be made：Silica flour 250-270, flyash 40-50, aluminium hydroxide 9-12, rice bran 40-45, Iron-ore Slag 20-30, carbonic acid
Calcium powder 20-30, polycarboxylate water-reducer 1-2, polyacrylamide 1-2, tung oil 1-2, alumina silicate 45-50, corn stalk powder 30-40,
Bamboo charcoal 22-30, clay 30-40, corn flour 14-18, silane resin acceptor kh-550 3-4, appropriate amount of water.Present invention uses fine coal
Ash, adds the fine and smooth degree of molding sand, it is easy to moulding, has saved the energy；By using powder of straw, corn flour etc., add
Gas permeability and high temperature collapsibility；The invention stone flour class, with reference to organic bond is added, enhances plasticity, dispersiveness through calcining
And gas permeability.The invention is easy to moulding, coremaking, solves casting shrinkage cavity and porosity effect up to more than 91%, improves casting yield, but
The heat-resisting ability of the invention is still not enough, it is difficult to ensure the heat endurance of molding sand.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of moulding sand for casting and its preparation side
Method, good mechanical property, with preferably heat-resisting ability, heat endurance is good.
A kind of moulding sand for casting that the present invention is provided, includes the raw material of following parts by weight：
80-90 parts of silica flour, 20-26 parts of bentonite, 15-17 parts of glass-cermic powder, 12-14 parts of flyash, 7-9 parts of steel fibre, glass
14-18 parts of fiber, 10-15 parts of furane resins, 4-7 parts of inositol hexaphosphate, 1-2 parts of silicone oil, 4-6 parts of starch, coupling agent 1-2
Part, 2-4 parts of curing agent, 15-18 parts of water.
Preferably, the mesh number of silica flour is 100-200 mesh, the mesh number of glass-cermic powder is 300-400 mesh；Bentonite is organic
Bentonite.
Preferably, the length of steel fibre is 1-2mm, a diameter of 0.5-1mm；The length of glass fibre is 0.5-1mm, directly
Footpath is 0.1-0.5mm.
Preferably, starch green starch, tapioca, sweet potato starch, starch from sweet potato, farina, wheat kind of starch
One or two or more kinds of mixtures.
Preferably, coupling agent is the mixture of silane coupler and zirconium class coupling agent, weight ratio between the two is 4:
1。
Preferably, curing agent is the mixture of aliphatic curing agent and aromatic hardener, weight ratio between the two
For 1:2.
Present invention also offers a kind of preparation method of moulding sand for casting, comprise the following steps：
（1）, by above-mentioned parts by weight weigh various raw materials；
（2）, silica flour, bentonite, glass-cermic powder, flyash, steel fibre, glass fibre are added in mixer mix 10-
15min, then adds furane resins, inositol hexaphosphate, silicone oil, starch, coupling agent, curing agent, water, mixes 20-30min,
Obtain mixture；
（3）, by step（2）In mixture calcining 2h, temperature control is at 1300-1400 DEG C；
（4）, cooling, obtain molding sand after broken and screening.
Wherein,
Step（2）In mixer mixing speed be 400-600r/min.
Step（2）Middle control temperature is at 40-50 DEG C.
A kind of moulding sand for casting of the present invention and preparation method thereof, good mechanical property, with preferably heat-resisting ability, heat
Good stability, preparation technology is simple, specifically has the beneficial effect that：
（1）, glass-cermic powder can strengthen wear-resisting, the acid-proof alkaline of molding sand；Steel fibre can greatly improve the physical strength of molding sand；Glass
Fiber can improve the impact strength and toughness of molding sand, also improve temperature capacity；
（2）, furane resins can improve the corrosion resistance and heat resistance of molding sand, inositol hexaphosphate, starch and bentonite can make each original
Material is only bonded；Coupling agent can promote the bonding between different material, and can improve rheological property；
（3）, preparation method it is simple, can stably prepare molding sand, silica flour is different with the mesh number of glass-cermic powder, can effectively mix
Integrally.
Embodiment
Invention is described in further detail below in conjunction with specific embodiment.
Embodiment 1
A kind of moulding sand for casting of the present embodiment, includes the raw material of following parts by weight：
80 parts of silica flour, 20 parts of bentonite, 15 parts of glass-cermic powder, 12 parts of flyash, 7 parts of steel fibre, 14 parts of glass fibre, furans tree
10 parts of fat, 4 parts of inositol hexaphosphate, 1 part of silicone oil, 4 parts of starch, 1 part of coupling agent, 2 parts of curing agent, 15 parts of water.
In the present embodiment, the mesh number of silica flour is 100 mesh, and the mesh number of glass-cermic powder is 300 mesh；Bentonite is organic swelling
Soil.
In the present embodiment, the length of steel fibre is 1mm, a diameter of 0.5mm；The length of glass fibre is 0.5mm, a diameter of
0.1mm。
In the present embodiment, starch green starch, tapioca, sweet potato starch, starch from sweet potato, farina, Mai Leidian
The mixture of powder.
In the present embodiment, coupling agent is the mixture of silane coupler and zirconium class coupling agent, and weight ratio between the two is
4:1。
In the present embodiment, curing agent is the mixture of aliphatic curing agent and aromatic hardener, weight between the two
Than for 1:2.
The present embodiment additionally provides a kind of preparation method of moulding sand for casting, comprises the following steps：
（1）, by above-mentioned parts by weight weigh various raw materials；
（2）, silica flour, bentonite, glass-cermic powder, flyash, steel fibre, glass fibre are added in mixer mix 10min,
Then furane resins, inositol hexaphosphate, silicone oil, starch, coupling agent, curing agent, water are added, 20min is mixed, is mixed
Thing；
（3）, by step（2）In mixture calcining 2h, temperature control is at 1300 DEG C；
（4）, cooling, obtain molding sand after broken and screening.
Wherein,
Step（2）In mixer mixing speed be 400r/min.
Step（2）Middle control temperature is at 40 DEG C.
Embodiment 2
A kind of moulding sand for casting of the present embodiment, includes the raw material of following parts by weight：
85 parts of silica flour, 24 parts of bentonite, 16 parts of glass-cermic powder, 13 parts of flyash, 8 parts of steel fibre, 16 parts of glass fibre, furans tree
13 parts of fat, 5 parts of inositol hexaphosphate, 1.5 parts of silicone oil, 5 parts of starch, 1.5 parts of coupling agent, 3 parts of curing agent, 17 parts of water.
In the present embodiment, the mesh number of silica flour is 200 mesh, and the mesh number of glass-cermic powder is 300 mesh；Bentonite is organic swelling
Soil.
In the present embodiment, the length of steel fibre is 1.5mm, a diameter of 0.8mm；The length of glass fibre is 0.8mm, diameter
For 0.3mm.
In the present embodiment, starch green starch, tapioca, sweet potato starch, starch from sweet potato, farina, Mai Leidian
The mixture of powder.
In the present embodiment, coupling agent is the mixture of silane coupler and zirconium class coupling agent, and weight ratio between the two is
4:1。
In the present embodiment, curing agent is the mixture of aliphatic curing agent and aromatic hardener, weight between the two
Than for 1:2.
The present embodiment additionally provides a kind of preparation method of moulding sand for casting, comprises the following steps：
（1）, by above-mentioned parts by weight weigh various raw materials；
（2）, silica flour, bentonite, glass-cermic powder, flyash, steel fibre, glass fibre are added in mixer mix 13min,
Then furane resins, inositol hexaphosphate, silicone oil, starch, coupling agent, curing agent, water are added, 25min is mixed, is mixed
Thing；
（3）, by step（2）In mixture calcining 2h, temperature control is at 1350 DEG C；
（4）, cooling, obtain molding sand after broken and screening.
Wherein,
Step（2）In mixer mixing speed be 500r/min.
Step（2）Middle control temperature is at 45 DEG C.
Embodiment 3
A kind of moulding sand for casting of the present embodiment, includes the raw material of following parts by weight：
90 parts of silica flour, 26 parts of bentonite, 17 parts of glass-cermic powder, 14 parts of flyash, 9 parts of steel fibre, 18 parts of glass fibre, furans tree
15 parts of fat, 7 parts of inositol hexaphosphate, 2 parts of silicone oil, 6 parts of starch, 2 parts of coupling agent, 4 parts of curing agent, 18 parts of water.
In the present embodiment, the mesh number of silica flour is 200 mesh, and the mesh number of glass-cermic powder is 400 mesh；Bentonite is organic swelling
Soil.
In the present embodiment, the length of steel fibre is 2mm, a diameter of 1mm；The length of glass fibre is 1mm, a diameter of
0.5mm。
In the present embodiment, starch green starch, tapioca, sweet potato starch, starch from sweet potato, farina, Mai Leidian
The mixture of powder.
In the present embodiment, coupling agent is the mixture of silane coupler and zirconium class coupling agent, and weight ratio between the two is
4:1。
In the present embodiment, curing agent is the mixture of aliphatic curing agent and aromatic hardener, weight between the two
Than for 1:2.
The present embodiment additionally provides a kind of preparation method of moulding sand for casting, comprises the following steps：
（1）, by above-mentioned parts by weight weigh various raw materials；
（2）, silica flour, bentonite, glass-cermic powder, flyash, steel fibre, glass fibre are added in mixer mix 15min,
Then furane resins, inositol hexaphosphate, silicone oil, starch, coupling agent, curing agent, water are added, 30min is mixed, is mixed
Thing；
（3）, by step（2）In mixture calcining 2h, temperature control is at 1400 DEG C；
（4）, cooling, obtain molding sand after broken and screening.
Wherein,
Step（2）In mixer mixing speed be 600r/min.
Step（2）Middle control temperature is at 50 DEG C.
Embodiment 1-3 assay is as follows：
High temperature compression strength is more than 6min in more than 1Mpa, gas forming amount in below 13ml/g, heat-resistant time, and room temperature tensile intensity is big
In 0.1Mpa, hot-drawn intensity is more than 0.02Mpa；Compact rate of molding is 37%, and air penetrability is 117.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of moulding sand for casting, it is characterised in that：Include the raw material of following parts by weight：
80-90 parts of silica flour, 20-26 parts of bentonite, 15-17 parts of glass-cermic powder, 12-14 parts of flyash, 7-9 parts of steel fibre, glass
14-18 parts of fiber, 10-15 parts of furane resins, 4-7 parts of inositol hexaphosphate, 1-2 parts of silicone oil, 4-6 parts of starch, coupling agent 1-2
Part, 2-4 parts of curing agent, 15-18 parts of water.
2. moulding sand for casting according to claim 1, it is characterised in that：The mesh number of silica flour is 100-200 mesh, glass-cermic powder
Mesh number be 300-400 mesh；Bentonite is organobentonite.
3. moulding sand for casting according to claim 1, it is characterised in that：The length of steel fibre is 1-2mm, a diameter of 0.5-
1mm；The length of glass fibre is 0.5-1mm, a diameter of 0.1-0.5mm.
4. moulding sand for casting according to claim 1, it is characterised in that：Starch green starch, tapioca, sweet potato are formed sediment
The amyloid one or two or more kinds of mixture of powder, starch from sweet potato, farina, wheat.
5. moulding sand for casting according to claim 1, it is characterised in that：Coupling agent is silane coupler and zirconium class coupling agent
Mixture, weight ratio between the two is 4:1.
6. moulding sand for casting according to claim 1, it is characterised in that：Curing agent is that aliphatic curing agent and aromatic series are hard
The mixture of agent, weight ratio between the two is 1:2.
7. a kind of preparation method of moulding sand for casting according to claim 1-6 any one, it is characterised in that：Including with
Lower step：
（1）, by above-mentioned parts by weight weigh various raw materials；
（2）, silica flour, bentonite, glass-cermic powder, flyash, steel fibre, glass fibre are added in mixer mix 10-
15min, then adds furane resins, inositol hexaphosphate, silicone oil, starch, coupling agent, curing agent, water, mixes 20-30min,
Obtain mixture；
（3）, by step（2）In mixture calcining 2h, temperature control is at 1300-1400 DEG C；
（4）, cooling, obtain molding sand after broken and screening.
8. the preparation method of moulding sand for casting according to claim 7, it is characterised in that：Step（2）In mixer
Mixing speed is 400-600r/min.
9. the preparation method of moulding sand for casting according to claim 7, it is characterised in that：Step（2）Middle control temperature exists
40-50℃。
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| CN201710510154.9A CN107214292A (en) | 2017-06-28 | 2017-06-28 | A kind of moulding sand for casting and preparation method thereof |
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| CN201710510154.9A CN107214292A (en) | 2017-06-28 | 2017-06-28 | A kind of moulding sand for casting and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108568492A (en) * | 2018-05-11 | 2018-09-25 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of the special molding sand of hot investment casting |
| CN108568493A (en) * | 2018-05-11 | 2018-09-25 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of moulding sand for casting |
| CN109175214A (en) * | 2018-10-19 | 2019-01-11 | 含山县兴达球墨铸铁厂 | A kind of casting rapid-curing cutback sand formulation |
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| CN109175214A (en) * | 2018-10-19 | 2019-01-11 | 含山县兴达球墨铸铁厂 | A kind of casting rapid-curing cutback sand formulation |
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Application publication date: 20170929 |