CN106670390B - A kind of solvable sand core forming method of band Dome winding shell - Google Patents
A kind of solvable sand core forming method of band Dome winding shell Download PDFInfo
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- CN106670390B CN106670390B CN201611045874.4A CN201611045874A CN106670390B CN 106670390 B CN106670390 B CN 106670390B CN 201611045874 A CN201611045874 A CN 201611045874A CN 106670390 B CN106670390 B CN 106670390B
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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
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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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Abstract
The invention discloses a kind of solvable sand core forming methods of band Dome winding shell, belong to technical field of composite material molding.The sand core includes two and half sand cores and a sand core axis, the forming method include：Prepare polyvinyl alcohol liquid；Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepare foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；Half sand core mould is made, the glass cloth slurry, glass fibre slurry, foundry quartz sand slurry are spread successively in the half sand core mould, carries out the molding of half sand core blank；Sand core blank is molded；Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；The sand core semi-finished product are handled through dry powder pulp surface successively and polyvinyl alcohol liquid is surface-treated, obtain sand core finished product.Sand core strength is high, is suitable for making large scale soluble core mould.
Description
Technical field
The present invention relates to technical field of composite material molding, more particularly to a kind of solvable sand core molding of band Dome winding shell
Method.
Background technology
Filament wound composite high degree of automation, winding product is with designability is strong, stock utilization is high, than strong
The features such as high is spent, using more and more extensive.Fiber winding must carry out on core model, and few fibers winding product has in metal
Lining or non-metallic inner liner, the tension and solidification internal stress that fiber can be supported to wind, liner can be used as core model；But some is produced
Product are soft material without liner or liner, need winding mandrel, and also need to core model after product molding to deviate from, but with envelope
The core model of head winding shell product can not integrally be deviate from.For this problem, there are metal detachable core model and soluble core mould at present
Deng.Metal detachable core model cost is very high, weight is big, and assembly, dismounting are all more difficult；Soluble core mould mainly have gypsum core model and
Polyvinyl alcohol sand core mould etc., gypsum core model is mainly used for coarse scale structures product, needs to prepare skeleton, process is complicated, to tooling
It is required that high, cost is also higher；Polyvinyl alcohol soluble core mould is simple in structure, at low cost, but is only applicable to small-size product, works as size
When larger, since the dead weight of sand core mould is larger, polyvinyl alcohol sand core mode structure intensity is low, it is difficult to be molded, intensity is poor after molding, no
It can serve as winding mandrel.
Invention content
The object of the present invention is to provide a kind of solvable sand core forming methods of band Dome winding shell, to the solvable core of polyvinyl alcohol
Mode structure is enhanced, its structural strength is improved, and is suitable for making large scale soluble core mould, at low cost, light-weight, and without system
Standby skeleton, process are simple.
To achieve the above object, the present invention provides a kind of solvable sand core forming method of band Dome winding shell, the sand
Core includes two and half sand cores and a sand core axis, the forming method include：
Prepare polyvinyl alcohol liquid；
Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepared
Foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；
Half sand core mould is made, the glass cloth slurry, glass fibre slurry, foundry quartz sand slurry are spread successively into described
In half sand core mould, the molding of half sand core blank is carried out；The half sand core mould includes cope plate, lower template and lower mode cavity；
Sand core blank is molded；
Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
The sand core semi-finished product are handled through dry powder pulp surface successively and polyvinyl alcohol liquid is surface-treated, are obtained
Sand core finished product.
Further, the preparation polyvinyl alcohol liquid, including：By polyvinyl alcohol and water according to 100 ︰'s 400~800
Weight ratio mixes, and mixture is kept the temperature 1h~5h at a temperature of 90 DEG C~120 DEG C, is stirred when being then cooled to 80 DEG C~100 DEG C
Mixture is mixed, polyvinyl alcohol is made to be completely dissolved, obtains polyvinyl alcohol liquid.
Further, it is described by foundry quartz sand, glass fibre, glass cloth, dry powder respectively with it is described PVA mixed
Liquid mixing is closed, foundry quartz sand slurry, glass fibre slurry, glass cloth slurry, dry powder slurry are prepared, including：Stone will be cast
Sand, glass fibre, glass cloth, dry powder dry 0.5h~5h at a temperature of 100 DEG C~200 DEG C；By the casting after drying
Quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, are sufficiently stirred, and must be cast respectively
Quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry.
Further, the foundry quartz sand slurry is the foundry quartz sand and polyvinyl alcohol of 100 ︰ 20~30 by weight ratio
Mixed liquor forms, and the glass fibre slurry is by the glass fibre and polyvinyl alcohol liquid group that weight ratio is 100 ︰ 25~35
At the glass cloth slurry is made of the glass cloth that weight ratio is 100 ︰ 25~35 and polyvinyl alcohol liquid, the dry powder
Slurry is made of the dry powder that weight ratio is 100 ︰ 20~30 and polyvinyl alcohol liquid.
Further, described to spread the glass cloth slurry, glass fibre slurry, foundry quartz sand slurry into described successively
In half sand core mould, the molding of half sand core blank is carried out, including：The cope plate of half sand core mould is opened, first spreads 2mm~10mm in a mold
The glass cloth slurry of thickness is simultaneously compacted, and then spreads the glass fibre slurry of 2mm~10mm thickness and compacting, then pours into foundry quartz sand slurry
Expect requirement thickness and be compacted, die face is less than sand core horizontal plane 0.5mm~2mm；Cope plate, double of sand core mould pressurization are installed
Compacting；It curing molding and is demoulded after compacting.
Further, the curing molding and demould be specially：110 DEG C~140 DEG C of solidification temperature keeps the temperature 12h~48h,
It is cooled to 60 DEG C~80 DEG C demouldings with stove.
Further, the sand core blank molding, including：Polyvinyl alcohol is smeared in sand core axis and sand core rigging position
Liquid；It is that sand core is whole by two and half sand core blanks and a sand core axis assembly, gap does not surpass between ensureing two and half sand core blanks
Cross 5mm；The sand core assembled is integrally subjected to curing process, obtains sand core blank.
Further, the temperature of the curing process is 110 DEG C~140 DEG C, keeps the temperature 12h~48h, 60 DEG C are cooled to stove
~80 DEG C obtain sand core blank.
Further, the dry powder pulp surface processing, including：Sand core semi-finished product are preheating to 60 DEG C~80 DEG C,
Its outer surface uniformly applies and scrapes the dry powder slurry；It stands, outer surface polishes flat after solidification；By the sand core after polishing half at
Product keep the temperature 2h~6h at a temperature of 90 DEG C~120 DEG C.
Further, the polyvinyl alcohol liquid surface treatment, including：With 50 DEG C~60 DEG C hot water by the polyethylene
Alcohol mixed liquor is diluted to the glue that viscosity is 10 seconds~20 seconds；The glue is heated to being sprayed on after 40 DEG C~70 DEG C and is preheated to
60 DEG C or more of sand core surface of semi-finished keeps the temperature 0.5h~3h at a temperature of 90 DEG C~120 DEG C.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The solvable sand core forming method of band Dome winding shell provided in the embodiment of the present invention, including：Prepare polyvinyl alcohol
Mixed liquor；Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepare casting
Make quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；Half sand core mould is made, the glass cloth is starched
Material, glass fibre slurry, foundry quartz sand slurry are spread successively in the half sand core mould, carry out the molding of half sand core blank；Sand core
Blank is molded；Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；Successively by the sand core semi-finished product
It is handled through dry powder pulp surface and polyvinyl alcohol liquid is surface-treated, obtain sand core finished product.Pass through glass fibre and glass
Cloth enhances polyvinyl alcohol soluble core mould, forms self-framework, improves sand core strength, is suitable for making the solvable core of large scale
Mould, it is at low cost, light-weight, and without preparing skeleton, process is simple, can substitute the complicated and higher metal detachable core of cost
Mould and gypsum core model.
Description of the drawings
Fig. 1 is the solvable sand core forming method flow chart of band Dome winding shell provided in an embodiment of the present invention；
Fig. 2 is half sand core die for blank and shaping schematic view in the embodiment of the present invention；
Fig. 3 is the installation diagram of sand core blank in the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is solvable to polyvinyl alcohol by providing a kind of solvable sand core forming method of band Dome winding shell
Core mold structure is enhanced, its structural strength is improved, and is suitable for making large scale soluble core mould, at low cost, light-weight, and is not necessarily to
Skeleton is prepared, process is simple.
To achieve the above object, the general thought of offer of embodiment of the present invention technical solution is as follows：
The present invention provides a kind of solvable sand core forming method of band Dome winding shell, including：
Prepare polyvinyl alcohol liquid；
Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepared
Foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；
Half sand core mould is made, the glass cloth slurry, glass fibre slurry, foundry quartz sand slurry are spread successively into described
In half sand core mould, the molding of half sand core blank is carried out；The half sand core mould includes cope plate, lower template and lower mode cavity；
Sand core blank is molded；
Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
The sand core semi-finished product are handled through dry powder pulp surface successively and polyvinyl alcohol liquid is surface-treated, are obtained
Sand core finished product.
The present invention is can be seen that by the above content to carry out polyvinyl alcohol soluble core mould by glass fibre and glass cloth
Enhancing forms self-framework, improves sand core strength, is suitable for making large scale soluble core mould, at low cost, light-weight, and is not necessarily to
Skeleton is prepared, process is simple, can substitute the complicated and higher metal detachable core model of cost and gypsum core model.
In order to better understand the above technical scheme, below in conjunction with Figure of description and specific implementation mode to above-mentioned
Technical solution is described in detail.
A kind of solvable sand core forming method of band Dome winding shell, the sand core include two and half sand cores and a sand core
Axis, referring to Fig. 1, the forming method includes：
Step S100：Prepare polyvinyl alcohol liquid；
Specifically, in the step s 100, the method for preparing polyvinyl alcohol liquid is：By polyvinyl alcohol and water according to 100 ︰
400~800 weight ratio mixing, mixture is kept the temperature into 1h~5h at a temperature of 90 DEG C~120 DEG C, be then cooled to 80 DEG C~
Mixture is stirred at 100 DEG C with anti-agglomeration, so that polyvinyl alcohol is completely dissolved, is obtained polyvinyl alcohol liquid.
Wherein, the proportioning of polyvinyl alcohol liquid can influence the mixing with sand, the excessive sand of polyvinyl alcohol is mixed not to enter,
It is mixed uneven；Then viscosity of mixed liquid is small for dilutional hyponatremia, fail to stick sand, so selecting the weight ratio of polyvinyl alcohol and water for 100 ︰
400~800.90 DEG C~120 DEG C of holding temperature, soaking time 1h~5h can be such that polyvinyl alcohol fully dissolves.
Step S110：Prepare slurry；By foundry quartz sand, glass fibre, glass cloth, dry powder respectively with the polyethylene
Alcohol mixed liquor mixes, and prepares foundry quartz sand slurry, glass fibre slurry, glass cloth slurry, dry powder slurry；
Specifically, in step s 110, preparing foundry quartz sand slurry, glass fibre slurry, glass cloth slurry, dry powder
The specific method of slurry is：Foundry quartz sand, glass fibre, glass cloth, dry powder are dried at a temperature of 100 DEG C~200 DEG C
Dry 0.5h~5h；By after drying foundry quartz sand, glass fibre, glass cloth, dry powder respectively with the polyvinyl alcohol
Liquid mixes, and is sufficiently stirred, and obtains foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry respectively.
In the embodiment of the present invention, it is desirable that the use environment of slurry is not less than 20 DEG C, and when use removes the film of pulp surface
Layer.
The purpose of drying is to remove foundry quartz sand, glass fibre, glass cloth, moisture content and impurity in dry powder, drying
Temperature select 100 DEG C~200 DEG C, 0.5h~5h can reach this purpose, and not attacking material, and temperature is excessively high or overlong time meeting
Material is caused to damage.
Wherein, the foundry quartz sand slurry is the foundry quartz sand and polyvinyl alcohol of 100 ︰ 20~30 by weight ratio
Liquid forms, and the glass fibre slurry is made of the glass fibre that weight ratio is 100 ︰ 25~35 and polyvinyl alcohol liquid, institute
State glass cloth slurry by weight ratio be 100 ︰ 25~35 glass cloth and polyvinyl alcohol liquid form, the dry powder slurry by
The dry powder and polyvinyl alcohol liquid composition that weight ratio is 100 ︰ 20~30.The proportioning of above-mentioned each slurry can guarantee sand core have compared with
Good intensity, proportioning is excessive or too small can influence intensity.
Step S120：Half sand core mould is made referring to Fig. 2, including cope plate, lower template and lower mode cavity；The glass cloth is starched
Material, glass fibre slurry, foundry quartz sand slurry are spread successively in the half sand core mould, carry out the molding of half sand core blank；
Before making half sand core mould, first sand core blank is designed, the structural schematic diagram of sand core blank referring to Fig. 3,
It is made of two and half sand cores and a sand core axis, to mitigate weight, sand core thickness is 20mm~50mm, has long muscle and short muscle to rise and adds
Use is pretended, the width of muscle is (i.e.：Thickness) it is 20mm~50mm；Shape is square, can machine be added to desired size.
Specifically, in the step s 120, the half molding method of sand core blank is：The cope plate of half sand core mould is opened, is first existed
The glass cloth slurry of mold middle berth 2mm~10mm thickness is simultaneously compacted, and then spreads the glass fibre slurry of 2mm~10mm thickness and compacting,
Foundry quartz sand slurry is poured into again to requiring thickness and be compacted, and die face is less than sand core horizontal plane 0.5mm~2mm；It installs
Template, double of sand core mould pressurization compacting；It curing molding and is demoulded after compacting.
Polyvinyl alcohol soluble core mould can be enhanced into glass cloth slurry and glass fibre slurry by spreading, and it is strong to improve sand core
Degree.Foundry quartz sand slurry is used for shaping blank outer surface, glass fibre slurry and glass cloth slurry for being molded solvable sand core
Skeleton and bonding plane.It spreads and sand core strength can be improved into thickness selection 2mm~10mm and do not influence continuity and globality, thickness
Too small not have humidification, crossing conference influences globality.
Wherein, mold is lifted into big table hydraulic machine when double of sand core mould pressurization compacting, pressurize 0.2MPa~2MPa
It is compacted into.
Preferably, 110 DEG C~140 DEG C of solidification temperature, heat preservation 12h~48h carry out curing molding, with stove be cooled to 60 DEG C~
80 DEG C of demouldings.This solidification temperature and time can guarantee completion of cure, the intensity having had.
In the present embodiment, 2 half sand core blanks are made altogether according to the method for step S120.
Step S130：Sand core blank is molded；
Specifically, the sand core blank forming method is：Polyvinyl alcohol is smeared in sand core axis and sand core rigging position
Liquid；It is that sand core is whole by two and half sand core blanks and a sand core axis assembly, gap does not surpass between ensureing two and half sand core blanks
5mm is crossed, if gap is excessive, the compacting of available pressure machine；The sand core assembled is integrally subjected to curing process, the temperature of curing process
Degree is 110 DEG C~140 DEG C, keeps the temperature 12h~48h, is cooled to 60 DEG C~80 DEG C with stove and obtains sand core blank.
It smears polyvinyl alcohol liquid and plays bonding effect, sand core axis and sand core is made to be connected as entirety.Preferably, 3 are smeared altogether
Time, ensure that there is one layer of solution on surface, and without holiday at.
This solidification temperature and soaking time can guarantee completion of cure, the intensity for making sand core have.
Step S140：Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
Step S150：Surface treatment；By the sand core semi-finished product successively through the processing of dry powder pulp surface and polyvinyl alcohol
Mixed liquor is surface-treated, and obtains sand core finished product.
In step S150, the dry powder pulp surface processing, specially：Sand core semi-finished product are preheating to 60 DEG C~80
DEG C, it is uniformly applied in its outer surface and scrapes the dry powder slurry；It stands, outer surface polishes flat after solidification；By the sand after polishing
Core semi-finished product keep the temperature 2h~6h at a temperature of 90 DEG C~120 DEG C.Preferably, it is handled totally 1~3 time with dry powder pulp surface.
Surface treatment is carried out with dry powder slurry, mandrel surface quality can be improved, to ensure surface matter that product has had
Amount.
In step S150, the polyvinyl alcohol liquid surface treatment, specially：It will be described with 50 DEG C~60 DEG C hot water
Polyvinyl alcohol liquid is diluted to the glue that viscosity is 10 seconds~20 seconds；It is sprayed on after the glue is heated to 40 DEG C~70 DEG C
It is preheated to 60 DEG C or more of sand core surface of semi-finished, 0.5h~3h is kept the temperature at a temperature of 90 DEG C~120 DEG C.Preferably, poly- second
Enol mixed liquor surface treatment totally 1~3 time.
Surface treatment, which is carried out, with polyvinyl alcohol liquid can further improve mandrel surface quality.Gelatin viscosity crosses conference shadow
Spraying uniformity is rung, it is too small to influence adhesive strength, it can influence the surface quality of spraying.
Finally, the sand core finished product prepared is stored in 60 DEG C~80 DEG C of baking oven.
Through the above as can be seen that the solvable sand core molding side of band Dome winding shell provided in an embodiment of the present invention
Method enhances polyvinyl alcohol soluble core mould by glass fibre and glass cloth, forms self-framework, light-weight, structure is strong
It spends, large-scale soluble core mould can be molded, shaping speed is fast, reliable；Machine adds shape so that structure size can guarantee；Surface treatment
Afterwards, surface is smooth, and molding product inner surface quality is good, and no fifth wheel is bonded in surface；It can be externally wrapped with, be solidified at it
Shell body rinses out sand core and obtains inner surface smooth product.Also, sand core moulding material price is low, and tooling is simple, manufacturing cost
Low, sand core is at low cost.
It is for a more detailed description to the present invention by the following examples.These embodiments are only to the best embodiment party of the present invention
The description of formula does not have the scope of the present invention any limitation.
Embodiment 1
S1：Prepare polyvinyl alcohol liquid；
Polyethylene alcohol and water is weighed according to the weight ratio of 100 ︰ 400, is put into storing container, is capped, is then placed in baking oven,
5h is kept the temperature at 90 DEG C, and the mixture in storing container is stirred when being then cooled to 80 DEG C, polyvinyl alcohol is made to be completely dissolved, is obtained
To polyvinyl alcohol liquid.
S2：Prepare slurry；
Foundry quartz sand, glass fibre, glass cloth, dry powder are put into baking oven, 5h is dried in 100 DEG C；After drying
Foundry quartz sand, glass fibre, glass cloth, dry powder pour into respectively in the stirred tank of sand mixer, pour into polyvinyl alcohol
Then liquid starts sand mixer and is allowed to be sufficiently stirred, respectively foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and
Dry powder slurry.Wherein, the weight ratio of foundry quartz sand and polyvinyl alcohol liquid is 100 ︰ 20, glass fibre and polyvinyl alcohol
The weight ratio of mixed liquor is 100 ︰ 25, and the weight ratio of glass cloth and polyvinyl alcohol liquid is 100 ︰ 25, dry powder and polyethylene
The weight ratio of alcohol mixed liquor is 100 ︰ 20.
S3：Sand core blank is designed, half sand core mould is made；
Sand core thickness is 20mm, and the width of muscle is 20mm.
S4：Half sand core blank is molded；
The cope plate of half sand core mould is opened, first spread the glass cloth slurry of 2mm thickness in a mold and is compacted, it is thick then to spread 2mm
Glass fibre slurry and compacting, then pour into foundry quartz sand slurry to requiring thickness and be compacted, the horizontal plane of sand core is smooth, mould
Tool type face is less than sand core horizontal plane 0.5mm；Cope plate is installed, mold is lifted into big table hydraulic machine, pressurization 0.2MPa will
It is compacted；Cured after compacting, 110 DEG C of solidification temperature, keeps the temperature 48h, be cooled to 60 DEG C of demouldings with stove, obtain half sand core blank.
Then one and half sand core blanks are made again by the same way.
S5：Sand core blank is molded；
Polyvinyl alcohol liquid is smeared in sand core axis and sand core rigging position, smears 3 times, ensures that there is one layer of solution on surface,
At holiday；First sand core axis is adhered on half sand core blank, is then overturn the other half sand core blank, by two and half sand core hairs
Base is bonded together with a sand core axis, forms an entirety, and gap is no more than 5mm between ensureing two and half sand core blanks；It will
The sand core assembled integrally carries out curing process, and solidification temperature is 110 DEG C, keeps the temperature 48h, is cooled to 60 DEG C with stove and obtains sand core hair
Base.
S6：Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
S7：Surface treatment
S7.1：The processing of dry powder pulp surface
Sand core semi-finished product are preheating to 60 DEG C, is uniformly applied in its outer surface and scrapes the dry powder slurry, are smeared uniform；Painting is scraped
After stand, solidification, polishing outer surface make its flat smooth；Sand core semi-finished product after polishing are placed in baking oven, at 90 DEG C
Keep the temperature 6h.It repeats the above steps, coprocessing 3 times.
S7.2：Polyvinyl alcohol liquid is surface-treated
The polyvinyl alcohol liquid is diluted to the glue that viscosity is 10 seconds with 50 DEG C of hot water；The glue is heated to
It is sprayed on after 40 DEG C and is preheated to 60 DEG C or more of sand core surface of semi-finished, 3h are kept the temperature in 90 DEG C.It repeats the above steps, coprocessing 3
Time.
Successively after the processing of dry powder pulp surface and the surface treatment of polyvinyl alcohol liquid, sand core finished product is obtained, is preserved
In 60 DEG C of baking oven.
Embodiment 2
S1：Prepare polyvinyl alcohol liquid；
Polyethylene alcohol and water is weighed according to the weight ratio of 100 ︰ 600, is put into storing container, is capped, is then placed in baking oven,
3h is kept the temperature at a temperature of 110 DEG C, the mixture in storing container is stirred when being then cooled to 90 DEG C, keeps polyvinyl alcohol complete
Fully dissolved obtains polyvinyl alcohol liquid.
S2：Prepare slurry；
Foundry quartz sand, glass fibre, glass cloth, dry powder are put into baking oven, 3h is dried at a temperature of 150 DEG C；
Foundry quartz sand, glass fibre, glass cloth, dry powder after drying is poured into respectively in the stirred tank of sand mixer, poly- second is poured into
Then enol mixed liquor starts sand mixer and is allowed to be sufficiently stirred, obtain foundry quartz sand slurry, glass fibre slurry, glass respectively
Cloth slurry and dry powder slurry.Wherein, the weight ratio of foundry quartz sand and polyvinyl alcohol liquid be 100 ︰ 25, glass fibre and
The weight ratio of polyvinyl alcohol liquid is 100 ︰ 30, and the weight ratio of glass cloth and polyvinyl alcohol liquid is 100 ︰ 30, dry powder
Weight ratio with polyvinyl alcohol liquid is 100 ︰ 25.
S3：Sand core blank is designed, half sand core mould is made；
Sand core thickness is 40mm, and the width of muscle is 40mm.
S4：Half sand core blank is molded；
The cope plate of half sand core mould is opened, first spread the glass cloth slurry of 6mm thickness in a mold and is compacted, it is thick then to spread 6mm
Glass fibre slurry and compacting, then pour into foundry quartz sand slurry to requiring thickness and be compacted, the horizontal plane of sand core is smooth, mould
Tool type face is less than sand core horizontal plane 1mm；Cope plate is installed, mold is lifted into big table hydraulic machine, pressurization 1MPa is pressed
It is real；Cured after compacting, 120 DEG C of solidification temperature, keeps the temperature 30h, be cooled to 70 DEG C of demouldings with stove, obtain half sand core blank.
Then one and half sand core blanks are made again by the same way.
S5：Sand core blank is molded；
Polyvinyl alcohol liquid is smeared in sand core axis and sand core rigging position, smears 3 times, ensures that there is one layer of solution on surface,
At holiday；First sand core axis is adhered on half sand core blank, is then overturn the other half sand core blank, by two and half sand core hairs
Base is bonded together with a sand core axis, forms an entirety, and gap is no more than 5mm between ensureing two and half sand core blanks；It will
The sand core assembled integrally carries out curing process, and solidification temperature is 120 DEG C, keeps the temperature 30h, is cooled to 70 DEG C with stove and obtains sand core hair
Base.
S6：Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
S7：Surface treatment
S7.1：The processing of dry powder pulp surface
Sand core semi-finished product are preheating to 70 DEG C, is uniformly applied in its outer surface and scrapes the dry powder slurry, are smeared uniform；Painting is scraped
After stand, solidification, polishing outer surface make its flat smooth；Sand core semi-finished product after polishing are placed in baking oven, at 110 DEG C
Keep the temperature 4h.It repeats the above steps, coprocessing 2 times.
S7.2：Polyvinyl alcohol liquid is surface-treated
The polyvinyl alcohol liquid is diluted to the glue that viscosity is 15 seconds with 55 DEG C of hot water；The glue is heated to
It is sprayed on after 50 DEG C and is preheated to 60 DEG C or more of sand core surface of semi-finished, 2h is kept the temperature at a temperature of 110 DEG C.It repeats the above steps,
Coprocessing 2 times.
Successively after the processing of dry powder pulp surface and the surface treatment of polyvinyl alcohol liquid, sand core finished product is obtained, is preserved
In 70 DEG C of baking oven.
Embodiment 3
S1：Prepare polyvinyl alcohol liquid；
Polyethylene alcohol and water is weighed according to the weight ratio of 100 ︰ 800, is put into storing container, is capped, is then placed in baking oven,
1h is kept the temperature at a temperature of 120 DEG C, the mixture in storing container is stirred when being then cooled to 100 DEG C, makes polyvinyl alcohol
It is completely dissolved, obtains polyvinyl alcohol liquid.
S2：Prepare slurry；
Foundry quartz sand, glass fibre, glass cloth, dry powder are put into baking oven, dried at a temperature of 200 DEG C
0.5h；Foundry quartz sand, glass fibre, glass cloth, dry powder after drying is poured into respectively in the stirred tank of sand mixer, is poured into
Then polyvinyl alcohol liquid starts sand mixer and is allowed to be sufficiently stirred, respectively foundry quartz sand slurry, glass fibre slurry,
Glass cloth slurry and dry powder slurry.Wherein, the weight ratio of foundry quartz sand and polyvinyl alcohol liquid is 100 ︰ 30, glass fibers
The weight ratio of peacekeeping polyvinyl alcohol liquid is 100 ︰ 35, and the weight ratio of glass cloth and polyvinyl alcohol liquid is 100 ︰ 35, double
The weight ratio for flying powder and polyvinyl alcohol liquid is 100 ︰ 30.
S3：Sand core blank is designed, half sand core mould is made；
Sand core thickness is 50mm, and the width of muscle is 50mm.
S4：Half sand core blank is molded；
The cope plate of half sand core mould is opened, first spread the glass cloth slurry of 10mm thickness in a mold and is compacted, 10mm is then spread
Thick glass fibre slurry and compacting, then foundry quartz sand slurry is poured into requiring thickness and be compacted, the horizontal plane of sand core is smooth,
Die face is less than sand core horizontal plane 2mm；Install cope plate, mold is lifted into big table hydraulic machine, pressurization 2MPa by its
Compacting；Cured after compacting, 140 DEG C of solidification temperature, keeps the temperature 12h, be cooled to 80 DEG C of demouldings with stove, obtain half sand core blank.
Then one and half sand core blanks are made again by the same way.
S5：Sand core blank is molded；
Polyvinyl alcohol liquid is smeared in sand core axis and sand core rigging position, smears 3 times, ensures that there is one layer of solution on surface,
At holiday；First sand core axis is adhered on half sand core blank, is then overturn the other half sand core blank, by two and half sand core hairs
Base is bonded together with a sand core axis, forms an entirety, and gap is no more than 5mm between ensureing two and half sand core blanks；It will
The sand core assembled integrally carries out curing process, and solidification temperature is 140 DEG C, keeps the temperature 12h, is cooled to 80 DEG C with stove and obtains sand core hair
Base.
S6：Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
S7：Surface treatment
S7.1：The processing of dry powder pulp surface
Sand core semi-finished product are preheating to 80 DEG C, is uniformly applied in its outer surface and scrapes the dry powder slurry, are smeared uniform；Painting is scraped
After stand, solidification, polishing outer surface make its flat smooth；Sand core semi-finished product after polishing are placed in baking oven, at 120 DEG C
Keep the temperature 2h.
S7.2：Polyvinyl alcohol liquid is surface-treated
The polyvinyl alcohol liquid is diluted to the glue that viscosity is 20 seconds with 60 DEG C of hot water；The glue is heated to
It is sprayed on after 70 DEG C and is preheated to 60 DEG C or more of sand core surface of semi-finished, 0.5h is kept the temperature at a temperature of 120 DEG C.
Successively after the processing of dry powder pulp surface and the surface treatment of polyvinyl alcohol liquid, sand core finished product is obtained, is preserved
In 80 DEG C of baking oven.
The sand core product intensity that the embodiment of the present invention obtains improves 2-3 times compared with the solvable sand core of existing polyvinyl alcohol.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The solvable sand core forming method of band Dome winding shell provided in the embodiment of the present invention, including：Prepare polyvinyl alcohol
Mixed liquor；Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepare casting
Make quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；Half sand core mould is made, the glass cloth is starched
Material, glass fibre slurry, foundry quartz sand slurry are spread successively in the half sand core mould, carry out the molding of half sand core blank；Sand core
Blank is molded；Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；Successively by the sand core semi-finished product
It is handled through dry powder pulp surface and polyvinyl alcohol liquid is surface-treated, obtain sand core finished product.Pass through glass fibre and glass
Cloth enhances polyvinyl alcohol soluble core mould, forms self-framework, improves sand core strength, is suitable for making the solvable core of large scale
Mould, it is at low cost, light-weight, and without preparing skeleton, process is simple, can substitute the complicated and higher metal detachable core of cost
Mould and gypsum core model.
It should be noted last that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted,
Although being described the invention in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit of the technical scheme of the invention and range, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. a kind of solvable sand core forming method of band Dome winding shell, the sand core includes two and half sand cores and a sand core axis,
It is characterized in that, the forming method includes：
Prepare polyvinyl alcohol liquid；
Foundry quartz sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepare casting
Quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry；
Half sand core mould is made, the glass cloth slurry, glass fibre slurry, foundry quartz sand slurry are spread successively into half sand
In core model, the molding of half sand core blank is carried out；The half sand core mould includes cope plate, lower template and lower mode cavity；
Sand core blank is molded；
Sand core blank is machined to desired appearance and size, sand core semi-finished product are obtained；
The sand core semi-finished product are handled through dry powder pulp surface successively and polyvinyl alcohol liquid is surface-treated, obtain sand core
Finished product.
2. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that described to prepare poly- second
Enol mixed liquor, including：
Polyvinyl alcohol is mixed with water according to the weight ratio of 100 ︰ 400~800, by mixture at a temperature of 90 DEG C~120 DEG C
1h~5h is kept the temperature, mixture is stirred when being then cooled to 80 DEG C~100 DEG C, so that polyvinyl alcohol is completely dissolved, obtain polyvinyl alcohol
Mixed liquor.
3. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that described to cast stone
Sand, glass fibre, glass cloth, dry powder are mixed with the polyvinyl alcohol liquid respectively, prepare foundry quartz sand slurry, glass
Glass fibre stuff, glass cloth slurry, dry powder slurry, including：
Foundry quartz sand, glass fibre, glass cloth, dry powder are dried into 0.5h~5h at a temperature of 100 DEG C~200 DEG C；It will
Foundry quartz sand, glass fibre, glass cloth, dry powder after drying are mixed with the polyvinyl alcohol liquid respectively, are fully stirred
It mixes, obtains foundry quartz sand slurry, glass fibre slurry, glass cloth slurry and dry powder slurry respectively.
4. the solvable sand core forming method of band Dome winding shell as described in claim 1 or 3, which is characterized in that the casting
Quartz sand slurry is made of the foundry quartz sand that weight ratio is 100 ︰ 20~30 and polyvinyl alcohol liquid, the glass fibre slurry
Material is made of the glass fibre that weight ratio is 100 ︰ 25~35 and polyvinyl alcohol liquid, and the glass cloth slurry is by weight ratio
The glass cloth and polyvinyl alcohol liquid of 100 ︰ 25~35 forms, and the dry powder slurry is the double of 100 ︰ 20~30 by weight ratio
Fly powder and polyvinyl alcohol liquid composition.
5. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that described by the glass
Glass cloth slurry, glass fibre slurry, foundry quartz sand slurry are spread successively in the half sand core mould, carry out half sand core blank at
Type, including：
The cope plate of half sand core mould is opened, first spread the glass cloth slurry of 2mm~10mm thickness in a mold and is compacted, 2mm is then spread
The glass fibre slurry of~10mm thickness and compacting, then foundry quartz sand slurry is poured into requiring thickness and be compacted, die face is low
In sand core horizontal plane 0.5mm~2mm；Cope plate, double of sand core mould pressurization compacting are installed；It curing molding and is demoulded after compacting.
6. the band solvable sand core forming method of Dome winding shell as claimed in claim 5, which is characterized in that the curing molding
And it demoulds and is specially：110 DEG C~140 DEG C of solidification temperature keeps the temperature 12h~48h, 60 DEG C~80 DEG C demouldings is cooled to stove.
7. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that the sand core blank
Molding, including：
Polyvinyl alcohol liquid is smeared in sand core axis and sand core rigging position；Two and half sand core blanks and a sand core axis are assembled
For sand core entirety, gap is no more than 5mm between ensureing two and half sand core blanks；The sand core assembled is integrally carried out at solidification
Reason, obtains sand core blank.
8. the band solvable sand core forming method of Dome winding shell as claimed in claim 7, which is characterized in that the curing process
Temperature be 110 DEG C~140 DEG C, keep the temperature 12h~48h, be cooled to 60 DEG C~80 DEG C with stove and obtain sand core blank.
9. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that the round trip flight slurry
Material surface treatment, including：
Sand core semi-finished product are preheating to 60 DEG C~80 DEG C, is uniformly applied in its outer surface and scrapes the dry powder slurry；It stands, after solidification
Outer surface is polished flat；Sand core semi-finished product after polishing are kept the temperature into 2h~6h at a temperature of 90 DEG C~120 DEG C.
10. the band solvable sand core forming method of Dome winding shell as described in claim 1, which is characterized in that the polyethylene
Alcohol mixed liquor is surface-treated, including：
The polyvinyl alcohol liquid is diluted to the glue that viscosity is 10 seconds~20 seconds with 50 DEG C~60 DEG C hot water；By the glue
Liquid is heated to being sprayed on the sand core surface of semi-finished for being preheated to 60 DEG C or more after 40 DEG C~70 DEG C, in 90 DEG C~120 DEG C of temperature
Lower heat preservation 0.5h~3h.
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| CN109702929A (en) * | 2018-11-23 | 2019-05-03 | 内蒙古航天红岗机械有限公司 | A kind of molding die of Filament-Winding Vessel sand core mould |
| CN110978558B (en) * | 2019-12-30 | 2021-07-13 | 哈尔滨玻璃钢研究院有限公司 | Preparation method of seal-head-free fiber reinforced resin matrix composite material combustion chamber shell for rocket projectile |
| CN112405959A (en) * | 2020-11-17 | 2021-02-26 | 湖北三江航天江北机械工程有限公司 | Light structure sand core mold forming method |
| CN112872298A (en) * | 2021-01-08 | 2021-06-01 | 湖北三江航天江北机械工程有限公司 | Lightweight high-strength sand core mold forming method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005030256A1 (en) * | 2005-06-29 | 2007-01-18 | Bayerische Motoren Werke Ag | Water-dispersible core support for production of an automobile hollow structural component from fiber-reinforced plastic, made of a water-soluble starch ether binding agent and a filler composed of sand |
| CN102827445A (en) * | 2012-08-21 | 2012-12-19 | 中国航天科工集团第六研究院41所 | Water-soluble core mold material for forming filament-wound case and preparation method of water-soluble core mold material |
| CN103317628A (en) * | 2013-02-01 | 2013-09-25 | 北京玻钢院复合材料有限公司 | Preparation methods for soluble core mould and nonmetal-lining or no-lining fibre winding container |
| CN103331910A (en) * | 2013-06-17 | 2013-10-02 | 湖北三江航天江北机械工程有限公司 | Water soluble mandrel moulding method of dipulse engine shell |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07178825A (en) * | 1993-12-24 | 1995-07-18 | Sekisui Chem Co Ltd | Manufacture of composite resin pipe |
| DE102007026229A1 (en) * | 2007-06-05 | 2008-12-11 | Bayerische Motoren Werke Aktiengesellschaft | Process for producing a structural hollow component made of fiber-reinforced plastic |
-
2016
- 2016-11-21 CN CN201611045874.4A patent/CN106670390B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005030256A1 (en) * | 2005-06-29 | 2007-01-18 | Bayerische Motoren Werke Ag | Water-dispersible core support for production of an automobile hollow structural component from fiber-reinforced plastic, made of a water-soluble starch ether binding agent and a filler composed of sand |
| EP1745908A1 (en) * | 2005-06-29 | 2007-01-24 | Bayerische Motorenwerke Aktiengesellschaft | Water soluble core for producing fibre reinforced hollow objects |
| CN102827445A (en) * | 2012-08-21 | 2012-12-19 | 中国航天科工集团第六研究院41所 | Water-soluble core mold material for forming filament-wound case and preparation method of water-soluble core mold material |
| CN103317628A (en) * | 2013-02-01 | 2013-09-25 | 北京玻钢院复合材料有限公司 | Preparation methods for soluble core mould and nonmetal-lining or no-lining fibre winding container |
| CN103331910A (en) * | 2013-06-17 | 2013-10-02 | 湖北三江航天江北机械工程有限公司 | Water soluble mandrel moulding method of dipulse engine shell |
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