CN109746386A - A kind of foundry sand shell and preparation method thereof - Google Patents
A kind of foundry sand shell and preparation method thereof Download PDFInfo
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- CN109746386A CN109746386A CN201910182515.0A CN201910182515A CN109746386A CN 109746386 A CN109746386 A CN 109746386A CN 201910182515 A CN201910182515 A CN 201910182515A CN 109746386 A CN109746386 A CN 109746386A
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Abstract
The present invention relates to a kind of foundry sand shell and preparation method thereof, the foundry sand shell is prepared using zirconium carbonate ammonium, zirconium dioxide and bleeding agent as raw material by the techniques such as mixing, being coated with.Beneficial effects of the present invention: foundry sand shell production of the invention is simple, and good permeability, performance is stablized, and stickiness is good, at low cost；It is coated with again using wire binding sand part to increase the intensity of arenaceous shell, reduces the painting hierachy number of arenaceous shell, reduce the fabrication cycle of arenaceous shell.
Description
Technical field
The invention belongs to cast processing technique field, and in particular to a kind of foundry sand shell and preparation method thereof.
Background technique
The mixture shape that casting technique uses the very high thermosetting material silica sand of intensity or zircon sand and resin is carried out with arenaceous shell
At shell casting mold and it is poured and is obtained the casting method of casting.Carrying out casting technique with arenaceous shell has equipment investment few, accounts for
Ground area is small, convenient for production, high production efficiency, and foundry sand amount is few, and production scene dust is few, noise is small, thus to environment
Pollute small, the features such as surface finish of casting of production is high, and dimensional accuracy is high, and material property is good.
Currently, foundry sand shell cost of manufacture in the prior art is high, the production cycle is long, is coated with difficulty, and burning casts form quotient
It is low.
Summary of the invention
It is of the existing technology in order to solve the problems, such as, the present invention provides a kind of foundry sand shell and preparation method thereof,
Stablize with performance, stickiness is good, and at low cost, burning casts the features such as form quotient is high.
The object of the present invention is to provide a kind of foundry sand shells.
Another object of the present invention is to provide the preparation method of above-mentioned foundry sand shell.
The foundry sand shell of specific embodiment according to the present invention, the foundry sand shell are made of layered coating, face
The coating of layer includes zirconium carbonate ammonium, zirconium dioxide and bleeding agent；Coating in addition to surface layer includes silica solution, bauxite powder and infiltration
Saturating agent.
The foundry sand shell of specific embodiment according to the present invention, wherein the zirconium carbonate ammonium of the coating of surface layer, two
Zirconium oxide and bleeding agent are (17.8-18.2) by weight: (80.8-81.2): (0.95-1.05)；The bleeding agent is sulphur
Change dioctyl succinate sodium salt.Aerosol-OT salt is faint yellow to viscous brown oily liquid.Molecular weight 444.25.
Soluble easily in water, aqueous solution is creamy white.1% pH value of water solution is 6.5-7.Intolerant to strong acid, highly basic, reducing agent, heavy metallic salt.Tool
There are very high penetration, permeability Quick uniform.Lubricity, emulsibility, foaming characteristic are good.Anionic surfactant.
It is widely used as the emulsifier and detergent of shampoo, detergent and toothpaste etc..With excellent foaminess, wetability and washing performance.
Nontoxicity is small to skin irritation.Stablize in hard water, the generation of oil-in-water emulsifiers can be promoted.
The foundry sand shell of specific embodiment according to the present invention, wherein the zirconium carbonate ammonium, zirconium dioxide and infiltration
Agent is 18:81:1 by weight.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, the described method comprises the following steps:
(1) preparation of surface layer: proportion is weighed into zirconium carbonate ammonium, zirconium dioxide and bleeding agent, first by the load weighted carbon
Sour zirconium ammonium and the zirconium dioxide are mixed, and the load weighted bleeding agent is added while stirring after mixing, mixes again
It closes, is uniformly mixed and forms surface layer compo；The surface layer compo is coated on wax-pattern at 22-26 DEG C, is then carried out
Surface layer sand is spread, the surface layer sand is zirconium dioxide；
(2) preparation of the second layer: silica solution, bauxite powder and bleeding agent are uniformly mixed, and form second layer compo,
After the surface layer that step (1) is formed is dry, the second layer compo is applied in facing surface at 22-26 DEG C, is then carried out
Two layers of sand are spread, two layers of sand is bauxite sand；
(3) after the second layer that step (2) are formed is dry, several layers are prepared again according to the preparation method of the second layer, if to
After dried layer is dry, the coating of the last layer is smeared, the coating of the last layer and the second layer compo phase
Together, it dewaxes after the coating of the last layer is dry to get the foundry sand shell.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, wherein in step (1), mix again
The time of conjunction is 5 minutes.It is coated on wax-pattern immediately after mixing, incorporation time is shorter as far as possible, avoids going bad, but incorporation time is too
Short then mixing is uneven.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, wherein in step (1), the painting
The viscosity of material is 8-10cps, and the partial size for spreading zirconium dioxide used in surface layer sand is 40 mesh.Bleeding agent uses so that in the present invention
Viscosity of the coating can remain to be coated on wax part under the conditions of lower.The amount of stucco, which is subject to, in the present invention to tangle, more
It is much better.The viscosity of coating and the granularity of the sand spread directly affect the gas permeability of arenaceous shell.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, wherein in step (2), the aluminium
The partial size of alumina sand is 30-60 mesh.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, wherein in step (3), to step
(2) after the second layer formed is dry, layer 2-3 is prepared again according to the preparation method of the second layer, after dry, bundlees sand part with wire
3-5 layers are prepared again according to the preparation method of the second layer afterwards, are smeared the coating of the last layer after dry, to the last layer
Dewaxing is after coating is dry to get the foundry sand shell.Foundry sand shell of the invention is made of layered coating, layered coating
Middle layer is equipped with the net metal silk layer of one or more layers binding sand part.
The preferred iron wire of wire or stainless steel wire, good toughness and sturdy and durable are at low cost.Wire bundlees sand part to increase
The intensity of arenaceous shell reduces the painting hierachy number of arenaceous shell, reduces the fabrication cycle of arenaceous shell.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, wherein in step (2), to described
It dewaxes after coating is dry, then the shell after dewaxing is put into high temperature enameling furnace and is fired 3-4 hours to get the casting
Use arenaceous shell.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, further, using steam dewaxing,
Then the shell after dewaxing is put into progress segmented firing in high temperature enameling furnace, it is 400 DEG C that the first stage, which rises to temperature, heat preservation
Time is 1 hour；It is 750 DEG C that second stage, which rises to temperature, and soaking time is 1 hour；It is 1050 DEG C that phase III, which rises to temperature,
Soaking time is 2 hours；300 DEG C or less are cooled to after the completion of phase III firing to come out of the stove to get the foundry sand shell.
The application method of the foundry sand shell of specific embodiment according to the present invention, the foundry sand shell are used to prepare
Titanium and titanium alloy casting can be used for cast stainless steel casting, nickel and nickel alloy casting etc., preferably titanium and titanium alloy casting.
The preparation method of the foundry sand shell of specific embodiment according to the present invention, used in first layer compo
The partial size of zirconium dioxide is 325 mesh or so, and the partial size for the bauxite powder used in the second layer and several layers compo is 325
Mesh；The bauxite sand that third layer is used is that partial size is 16-30 mesh；The 4th layer of partial size to bauxite sand used before slurry seal be
10-20 mesh.The viscosity of coating in the present invention is 8-10cps, and the partial size for spreading zirconium dioxide used in surface layer sand is 40 mesh, other
Layer sand uses partial size for the bauxite sand of 16-30 mesh, and middle layer uses wire bundled fixed, so that made of the present invention
Arenaceous shell is not only sturdy and durable, but also good permeability, and the bleb of preparation is few, and surface smoothness is good.
The preparation method of the foundry sand shell of specific embodiment according to the present invention is dried after each layer of stucco
The temperature of environment is 22-26 DEG C, and humidity is 55-60%.The temperature and humidity of dry environment directly affect arenaceous shell finish, thoroughly
Gas etc., humidity is too low to might have slight crack, and the humidity too high time then dried is too long and perishable.
Compared with prior art, the invention has the following beneficial effects:
(1) foundry sand shell of the invention production is simple, and coating stickiness is good, finished product good permeability, and performance is stablized, cost
Low, burning casts form quotient height；
(2) it is coated with and is coated with again using wire binding sand part to increase the intensity of arenaceous shell afterwards several times, fasten finished product
It is durable, the painting hierachy number of arenaceous shell is reduced, reduces the fabrication cycle of arenaceous shell, reduces costs, and burns and casts form quotient height.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Embodiment 1
It present embodiments provides a kind of foundry sand shell to be made of layered coating, the coating of surface layer includes zirconium carbonate ammonium, two
Zirconium oxide and bleeding agent；Coating in addition to surface layer includes silica solution, bauxite powder and bleeding agent.The zirconium carbonate of investment precoat
Ammonium, zirconium dioxide and bleeding agent are 18:81:1 by weight.
Preparation method, comprising the following steps:
(1) proportion is weighed to the titanium dioxide zirconium powder and aerosol-OT salt of zirconium carbonate ammonium, equal 325 mesh of partial size,
First the load weighted zirconium carbonate ammonium and the zirconium dioxide are mixed, are added while stirring after mixing load weighted
The aerosol-OT salt, mixes again, is uniformly mixed and forms compo；
(2) compo for obtaining step (1) is coated on wax-pattern at 24 DEG C, then carries out stucco, and silicon is molten
Glue, bauxite powder and bleeding agent are uniformly mixed, and form second layer compo, after the surface layer that step (1) is formed is dry, 26
The second layer compo is applied in facing surface at DEG C, then carries out spreading two layers of sand, it is 30 purposes that two layers of sand, which is partial size,
Bauxite sand；The partial size of sand is directly related to the quality of casting, the size of stomata and stomata is included whether, according to the second layer
Preparation method prepares several layers again, after several layers are dry, the coating of the last layer is smeared, the painting of the last layer
Material is identical as the second layer compo, and dewaxing is after the coating of the last layer is dry to get the foundry sand shell.
Embodiment 2
It present embodiments provides a kind of foundry sand shell to be made of layered coating, the coating of surface layer includes zirconium carbonate ammonium, two
Zirconium oxide and bleeding agent；Coating in addition to surface layer includes silica solution, bauxite powder and bleeding agent.The bleeding agent is sulfonation amber
Amber dioctyl phthalate sodium salt, zirconium carbonate ammonium, zirconium dioxide and the aerosol-OT salt of investment precoat are by weight
18.2:80.8:1.05.Silica solution, bauxite powder and the aerosol-OT salt of coating in addition to surface layer are by weight
For 18:81:1.
Preparation method, comprising the following steps:
(1) proportion is weighed into zirconium carbonate ammonium, zirconium dioxide and aerosol-OT salt, sulfosuccinate dioctyl phthalate
Sodium salt crosses 325 meshes, first mixes the load weighted zirconium carbonate ammonium and the zirconium dioxide, is uniformly mixed back stirring
The aerosol-OT salt of sieving is added in side, mixes 5 minutes again, and being uniformly mixed and forming viscosity is the mixed of 8cps
Close coating；
(2) compo that step (1) obtains is coated on wax-pattern at 22 DEG C, then carries out stucco, silicon is molten
Glue, bauxite powder and bleeding agent are uniformly mixed, and form second layer compo, after the surface layer that step (1) is formed is dry, 22
The second layer compo is applied in facing surface at DEG C, then carries out spreading two layers of sand, it is 60 purposes that two layers of sand, which is partial size,
Bauxite sand；It carries out being coated with 4 times again after bundling sand part with iron wire after being coated with 2 times by the second layer, be coated with every time to the last time
It is coated with next time again after coating drying and hardening, the last layer not stucco, dewaxing is after whole coating are dry to get institute
State foundry sand shell.
Embodiment 3
It present embodiments provides a kind of foundry sand shell to be made of layered coating, the coating of surface layer includes zirconium carbonate ammonium, two
Zirconium oxide and bleeding agent；Coating in addition to surface layer includes silica solution, bauxite powder and bleeding agent.The bleeding agent is sulfonation amber
Amber dioctyl phthalate sodium salt, zirconium carbonate ammonium, zirconium dioxide and the aerosol-OT salt of investment precoat are by weight
17.8:81.2:0.95.
Preparation method, comprising the following steps:
(1) by proportion weighs zirconium carbonate ammonium, partial size is 325 mesh zirconium dioxide and aerosol-OT salt, first
The load weighted zirconium carbonate ammonium and the zirconium dioxide are mixed, load weighted institute is added while stirring after mixing
Aerosol-OT salt is stated, is mixed 5 minutes again, the compo for forming that viscosity is 8-10cps is uniformly mixed；
(2) compo that step (1) obtains is coated on wax-pattern at 26 DEG C, then carries out spreading zirconium dioxide,
Silica solution, bauxite powder and bleeding agent are uniformly mixed, second layer compo is formed, the surface layer formed to step (1) is dry
Afterwards, the second layer compo is applied in facing surface at 24 DEG C, then carries out spreading two layers of sand, two layers of sand is that partial size is
The bauxite sand of 45 mesh；
(3) it after the second layer that step (2) are formed is dry, is coated with 3 times according to the preparation method of the second layer, third layer is used
Bauxite sand be partial size be 20 mesh；The partial size of bauxite sand used is 15 mesh before 4th layer to the 8th layer slurry seal；Then
Preparation method after bundling sand part with iron wire according still further to the second layer is coated with 3 times, uniform stucco immediately after being coated with every time, is applied every time
It hangs and is coated with next time again after last coating is dry and hardens, the last layer is only coated with not stucco；Each layer is spread
It is dried after sand, dry environment is that temperature is 24 DEG C, humidity 58%；Then steam dewaxing is used, after then dewaxing
Shell be put into high temperature enameling furnace and carry out segmented firing, it is 400 DEG C that the first stage, which rises to temperature, and soaking time is 1 hour；
It is 750 DEG C that second stage, which rises to temperature, and soaking time is 1 hour；It is 1050 DEG C that phase III, which rises to temperature, soaking time 2
Hour；300 DEG C or less are cooled to after the completion of phase III firing to come out of the stove to get the foundry sand shell.
The use of foundry sand shell: foundry sand shell of the invention is used to prepare titanium and titanium alloy casting, can be used for
Cast stainless steel casting, nickel and nickel alloy casting etc., preferably titanium and titanium alloy casting.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of foundry sand shell, which is characterized in that the foundry sand shell is made of layered coating, and the coating of surface layer includes carbon
Sour zirconium ammonium, zirconium dioxide and bleeding agent；Coating in addition to surface layer includes silica solution, bauxite powder and bleeding agent.
2. foundry sand shell according to claim 1, which is characterized in that the zirconium carbonate ammonium, the dioxy of the coating of surface layer
Change zirconium and bleeding agent is (17.8-18.2) by weight: (80.8-81.2): (0.95-1.05)；The bleeding agent is sulfonation
Dioctyl succinate sodium salt.
3. foundry sand shell according to claim 2, which is characterized in that the zirconium carbonate ammonium, zirconium dioxide and bleeding agent
It is by weight 18:81:1.
4. the method for preparing foundry sand shell described in claim 1, which is characterized in that the described method comprises the following steps:
(1) preparation of surface layer: proportion is weighed into zirconium carbonate ammonium, zirconium dioxide and bleeding agent, first by the load weighted zirconium carbonate
Ammonium and the zirconium dioxide are mixed, and the load weighted bleeding agent is added while stirring after mixing, mixes again, are mixed
Conjunction is formed uniformly surface layer compo；The surface layer compo is coated on wax-pattern at 22-26 DEG C, then carries out spreading surface layer
Sand, the surface layer sand are zirconium dioxide；
(2) preparation of the second layer: silica solution, bauxite powder and bleeding agent are uniformly mixed, and second layer compo are formed, to step
Suddenly after the surface layer that (1) is formed is dry, the second layer compo is applied in facing surface at 22-26 DEG C, then carries out spreading two
Layer sand, two layers of sand are bauxite sand；
(3) after the second layer that step (2) are formed is dry, several layers are prepared again according to the preparation method of the second layer, to several layers
After drying, the coating of the last layer to be smeared, the coating of the last layer is identical as the second layer compo, to
Dewaxing is after the coating of the last layer is dry to get the foundry sand shell.
5. the preparation method of foundry sand shell according to claim 4, which is characterized in that in step (1), mix again
Time is 5 minutes.
6. the preparation method of foundry sand shell according to claim 4, which is characterized in that in step (1), the mixing is applied
The viscosity of material is 8-10cps, and the partial size for spreading zirconium dioxide used in surface layer sand is 40 mesh.
7. the preparation method of foundry sand shell according to claim 4, which is characterized in that in step (2), the bauxite
The partial size of sand is 30-60 mesh.
8. the preparation method of foundry sand shell according to claim 7, which is characterized in that in step (3), to step (2)
After the second layer of formation is dry, layer 2-3 is prepared again according to the preparation method of the second layer, after dry, after bundling sand part with wire
3-5 layers are prepared again according to the preparation method of the second layer, are smeared the coating of the last layer after dry, the painting to the last layer
Dewaxing is after material is dry to get the foundry sand shell.
9. the preparation method of foundry sand shell according to claim 4, which is characterized in that in step (3), to the coating
It dewaxes after drying, then the shell after dewaxing is put into high temperature enameling furnace and is fired 8-10 hours to get casting use
Arenaceous shell.
10. the preparation method of foundry sand shell according to claim 9, which is characterized in that use steam dewaxing, then will
Shell after dewaxing, which is put into high temperature enameling furnace, carries out segmented firing, and it is 400 DEG C that the first stage, which rises to temperature, and soaking time is
1 hour；It is 750 DEG C that second stage, which rises to temperature, and soaking time is 1 hour；It is 1050 DEG C, when heat preservation that phase III, which rises to temperature,
Between be 2 hours；300 DEG C or less are cooled to after the completion of phase III firing to come out of the stove to get the foundry sand shell.
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| CN113857424A (en) * | 2021-08-17 | 2021-12-31 | 成都兴宇精密铸造有限公司 | Titanium alloy investment casting shell surface coating and preparation method thereof |
| CN114210927A (en) * | 2021-12-31 | 2022-03-22 | 毕普帕罗洛江苏工程技术有限公司 | Shell-layer reinforcing process for inhibiting shell cracking |
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Application publication date: 20190514 |