CN105562623B - A kind of waterglass sand mold quick forming method - Google Patents
A kind of waterglass sand mold quick forming method Download PDFInfo
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- CN105562623B CN105562623B CN201511027666.7A CN201511027666A CN105562623B CN 105562623 B CN105562623 B CN 105562623B CN 201511027666 A CN201511027666 A CN 201511027666A CN 105562623 B CN105562623 B CN 105562623B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
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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
- B22C1/16—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention discloses a kind of waterglass sand mold quick forming method, belong to quick cast field.Including：(1) three-dimensional entity model of waterglass sand mold to be formed is set up, using Z axis as shaping direction, setting shaping thickness；(2) one layer of molding sand material is first laid, fill-before-fire binding agent is to form current layer contour patterns, and binding agent is the mixed solution of waterglass and polyvinyl alcohol；(3) microwave heating is carried out to current layer contour patterns, forms current layer sand mold profile；(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.The inventive method solves high request of the microwave heat hardening water-glass sand to mould, overcome the problem of overheat efflorescence of waterglass mould surface and easy moisture absorption, also overcome existing micro-injection bonding Quick-forming water virus feasibility poor, the problem of molding sand is stored and recovery difficult is big.
Description
Technical field
The invention belongs to quick cast field, increasing is bonded more particularly, to a kind of micro-injection of waterglass sand mold (core)
Material manufacturing technology.
Background technology
Green clean manufacturing is the trend of 21 century machine industry particularly foundary industry technology development.In quilt at present
In the big sand casting of wide variety of clay-bonded sand, water-glass sand and resin sand etc. three, water-glass sand mold casting is environment-friendly, is most
It is possible to realize the molding sand species of Green foundry.
The conventional method for curing of water-glass sand has CO2Three kinds of air blowing hardening, liquid organic ester hardening, heat hardening etc..
Using more CO2In two kinds of techniques of hardened sodium silicate sand and ester hardened sodium silicate sand, CO2Hardened sodium silicate sand technique exist with
Lower problem：Waterglass addition high (it is the 6%~8% of molding sand quality), the collapsibility difference of old sand and reuse regeneration are difficult.
By contrast, the waterglass addition of ester hardened sodium silicate sand is relatively low (it is the 2.5%~3.5% of molding sand quality), its old sand
Collapsibility and reuse reproducibility be significantly better than CO2The water-glass sand of hardening.But, the water virus of Ester cured there is also
Many shortcomings：Due to residual ester and residual Na2O accumulates the collapsibility of old sand after influence, recycling during recycling
There is degradating trend with reuse reproducibility.Practice and research show：Reduction waterglass addition, improve waterglass bonding efficiency and be gram
Take that water-glass sand old sand collapsibility is poor, peeling difficult, the most effectual way for the shortcomings of regenerating used reuse is poor.However,
When waterglass addition is less than 2.0%, the collapsibility and reuse reproducibility of its old sand are close to resin bonded sand.At present, it is actual raw
It can't realize that waterglass addition is less than 2.0% in production application.
Heat hardening water-glass sand is one of relatively early water-glass sand method for curing being found, and it can give full play to water glass
The bonding efficiency of glass, has the advantages that intensity height, waterglass addition are few.Common heating Hardening Sodium Silicate sand mold (core) is internal not
The easily efflorescence by paint baking over again of saturating, type (core) sand top layer is easily dried, and thermal energy consumption is big, firm time is long.And microwave heating is hard
Change the shortcoming that water virus can overcome common conductive formula to heat water virus, with homogeneous heating, firing rate it is fast,
The handling low advantage of the good, cost of raw material.Microwave heat hardening water-glass sand remains the advantage of water-glass sand, overcomes again
Existing CO2The shortcoming of hardened sodium silicate sand and ester hardened sodium silicate sand.
Microwave heat hardening water-glass sand application main bugbear be：Waterglass sand mold (core) after hardening has extremely strong
Hygroscopicity, parks the hardening strength rapid decrease of the microwave heating waterglass sand mold of 1~2 hour under air ambient.In addition, existing
There is the more difficult use requirement for meeting microwave heating waterglass sand mold of mold materials, because metal series mould material can not be used, wood
The easily temperature distortion such as mould and the modern designs of plastics.
Number of patent application is that 200810197391.5 Chinese patent applications disclose the micro- of a kind of waterglass sand mold or core
Ripple method for curing, sand mold is first put into short time heating (5 seconds~20 seconds heat time) in micro-wave oven together with mould, resists it by it
Compressive Strength is stripped afterwards more than 15KPa (molding intensity)；Then is carried out to the sand mold without mould the secondary microwave heating (heat time
More than 40 seconds), it is allowed to fully hardened, solves microwave heating water-glass sand to the high requests of mold materials, but this method is present
Problem is：Manufacturing cycle of sand mold and core box is longer, high expensive, sand mold through first time microwave heat the complexity of the demoulding by
The strict limitation of sand mold and core box complex degree of structure.
Forming technique is bonded using micro-injection and realizes quickly being manufactured without modelling for waterglass sand mold (core), sand can be significantly reduced
The production cycle of type (core), cost is reduced, and be easy to the microwave heat hardening of sand mold (core).Publication No. CN 104493101
A Chinese patent applications disclose the rapid prototyping system and method for a kind of high-precision ester solidification waterglass sand mold/core, and it uses water
Glass is with moulding sand mixture as formed powder material, and injection organic ester hardens waterglass, the subject matter that this method is present
It is：After waterglass is mixed with molding sand, the mobility of molding sand drastically declines, and complete layer of sand, technique can not be formed in table surface
It is difficult to be smoothed out；In addition, the layer of sand reclaimed water glass solidification being shaped can not provide very much certain intensity to layer of sand slowly, thereon
Flour last layer can be compressed, this phenomenon can have a strong impact on shaping layer below after successively amplifying under the pressure that deadweight is produced
Thick precision.Moreover, needing to wait 1h-8h after the shaping of waterglass sand mold, solidification can be just completed, its preparation efficiency is relatively low.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, Quick-forming water is bonded the invention provides a kind of micro-injection
Glass sand mold (core) method, uses the original molding sand of certain grain size distribution scope for the matrix material of shaping, with waterglass and poly-
The mixed solution of vinyl alcohol is binding agent, is selectively sprayed binding agent in the layer of sand sprawled to molding sand by micro-injection mode,
Waterglass is solidified molding sand using microwave heating and form layer profile, successively accumulation can quickly obtain no mould in this way
Change the waterglass sand mold prepared.The inventive method is mixed without using mould without molding sand with waterglass, in the absence of water glass type
The efflorescence of sand surface and easy sucting wet problem, process operability are strong.
To achieve the above object, according to one aspect of the present invention there is provided a kind of waterglass sand mold quick forming method,
Characterized in that, it comprises the following steps：
(1) according to the appearance profile size of waterglass sand mold to be formed, the three-dimensional of waterglass sand mold to be formed is set up
Physical model, using Z axis as shaping direction, setting shaping thickness；
(2) one layer of molding sand material is first laid, recycles shower nozzle in molding sand material surface jet binder to form current layer
Contour patterns,
The binding agent is the mixed solution of waterglass and polyvinyl alcohol；
(3) microwave heating is carried out to current layer contour patterns, makes waterglass dry solidification and then bond molding sand material solid
It is melted into current layer sand mold profile；
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.
In above inventive concept, the solidification of each layer of water-glass sand is realized using microwave heating, microwave heating
Layer of sand can be heated evenly, the waterglass in layer of sand is at the uniform velocity solidified, prevent internal stress and make to have glued
Layer of sand is tied to occur to tilt deformation.
In Practical Project practice, the power of microwave heating is 300W~2000W, and microwave heating equipment is being placed in workbench just
Top, when it drops to table surface, can seal to workbench, prevent microwave leakage, to each layer of molding sand material
And the binding agent being injected on this layer of molding sand material carries out the microwave curing time for 1s~4s.After the completion for the treatment of step (5), also
It is that after the shaping of last layer is completed, the heat time of microwave heating is 30s~60s.After the completion of heating, microwave heating equipment
Return, can take out waterglass sand mold (core) directly from workbench.
Further, in step (2), in the binding agent, the addition of polyvinyl alcohol for waterglass quality 1%~
4%.The amount of the polyvinyl alcohol added is limited, i.e., waterglass takes off during not influenceing water-glass sand intensity to prevent microwave heating again
Water-glass sand type moisture absorption in water-atomised and later stage placement process.
Further, in step (2), the viscosity of the binding agent is less than 10mPas.
Further, in step (2), the surface tension of the binding agent is 40mN/m~70mN/m.
Further, the injection volume of the binding agent once for corresponding current layer of sand voidage 10%~
50%.
Further, in step (2), the sweep speed of the shower nozzle is 0.5m/s~2m/s.
Further, in step (2), the molding sand material includes cleaning one kind in silica sand, nice foundry sand and zircon sand
Or it is a variety of.The molding sand material is conventional cast molding sand, for example cleans silica sand, nice foundry sand, zircon sand etc., molding sand material
Do not premixed with any binding agent or curing agent, can be easy to store and recycle, and can prevent that mobility, Yi Mianying is greatly reduced
Ring powdering quality.
Further, in step (2), the molding sand material particle size range is the mesh of 70 mesh~240.
Further, shaping thickness is set in step (1) as 0.1mm~0.3mm.
Further, in step (2), powdering speed during one layer of molding sand material of laying is 0.1m/s~0.5m/s.
Microwave heating, microwave power, microwave heating time, binding agent viscosity, surface tension, shower nozzle are swept above
Retouch the restriction of speed, molding sand material particle diameter, shaping thickness and powdering speed, it is ensured that waterglass sand mold (core) tool of shaping
There is optimal performance.
In the present invention, waterglass sand mold is also referred to as sodium silicate sand core.
Micro-injection in the present invention bonds Quick-forming waterglass sand mold (core) method and is based on discrete dynamics models shaping thought, first
The three-dimensional entity model of sand mold is first set up, shaping direction and lift height are determined according to the design feature of sand mold, then by three-dimensional
Model carries out discrete layering by thickness and is converted to machining control code, and forming workbench first vertically declines a thickness
Highly, the molding sand through the grain that sieves is laid on table surface by power spreading device, and shower nozzle is believed on layer of sand surface by current layer profile
The mixed solution of breath selectivity injection waterglass and polyvinyl alcohol, the microwave launcher directly over workbench declines and to work
Make platform sealing, transmitting microwave carries out heating to the layer of sand of table surface solidifies water-glass sand in 1 second~4 seconds, and microwave device is returned
Position, workbench declines a thickness height simultaneously, and so on accumulates and completes up to sand mold (core).This method can Quick-forming times
The waterglass sand mold (core) of meaning complicated shape, can be heated evenly layer of sand using microwave heat hardening mode, be not susceptible to tilt
Deformation, solves the mold materials restricted problem of microwave heating waterglass sand mold (core) well, and the molding sand used is not added with
Any chemical reagent, is easy to store and recycles.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
Micro-injection is layered bonding technology and microwave heat hardening technology and is combined together by the present invention, with molding sand material and viscous
Knot agent is raw material, and molding sand is not mixed with liquid reagent, with good mobility, can guarantee that consistency and the surfacing of layer of sand
Degree.Polyvinyl alcohol formation binding agent is added in water glass solution, the moisture absorption of waterglass sand mold (core) at normal temperatures can be effectively reduced
Ability, polyvinyl alcohol, which also serves as binding agent, can effectively reduce waterglass sand mold (core) surface powder phenomenon-tion.Each layer of water-glass sand
All hardened by microwave heating, molding sand is consolidated and with certain compression strength, can be also improved Z axis layering fine
Degree.
Shaping water-glass sand type (core) is bonded using micro-injection layering, the manufacture difficulty of complicated sand mold (core) is reduced, greatly
Width improves the forming efficiency of new casting product.Using microwave heat hardening water-glass sand, waterglass addition can be greatly reduced,
And water-glass sand hardening rate can be improved.RP technique is bonded using micro-injection to be combined with microwave heating technique, is overcome
Existing microwave heating water-glass sand (core) also overcomes to the high request of mold materials and surface efflorescence and easy sucting wet problem
Existing micro-injection bonding Quick-forming water virus feasibility is poor, storage and recovery difficult after molding sand is mixed with waterglass
Big the problem of.
Brief description of the drawings
Fig. 1 is the process chart of the inventive method；
Fig. 2 (a) is sodium silicate sand core contour structures schematic diagram in the embodiment of the present invention.
Fig. 2 (b) is water-glass sand type shaping direction schematic diagram in the embodiment of the present invention.
Fig. 3 is the gear prototype schematic diagram of middle gear sand mold of the embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
Fig. 1 is the process chart of the inventive method, as seen from the figure, and it includes following main step：
(1) according to the appearance profile size of waterglass sand mold (core) to be formed, water to be formed is set up in a computer
The three-dimensional entity model of glass sand mold (core), using Z axis as shaping direction, sets shaping thickness as 0.1mm~0.3mm.
(2) one layer of molding sand material is first laid, powdering speed during one layer of molding sand material of laying is 0.1m/s~0.5m/s.Again
Using shower nozzle in molding sand material surface jet binder to form current layer contour patterns, the binding agent is waterglass and poly- second
The mixed solution of enol.In the binding agent, the addition of polyvinyl alcohol is the 1%~4% of waterglass quality.Binding agent it is viscous
Degree is less than 10mPas, and the surface tension of binding agent is 40mN/m~70mN/m, and the injection volume of binding agent once is corresponding
The 10%~50% of current layer molding sand material voidage.The sweep speed of shower nozzle is 0.5m/s~2m/s.Molding sand material includes
Clean the one or more in silica sand, nice foundry sand and zircon sand.Molding sand material is not premixed with any binding agent or curing agent,
It can be easy to store and recycle, and can prevent that mobility is greatly reduced, in order to avoid influence powdering quality.Molding sand material particle size range
For the mesh of 70 mesh~240.
(3) microwave heating is carried out to current layer contour patterns, makes waterglass dry solidification and then bond molding sand material solid
It is melted into current layer sand mold profile.The power of microwave heating is 300W~2000W, and microwave heating equipment is placed in directly over workbench,
When it drops to table surface, workbench can be sealed, prevent microwave leakage, to each layer of molding sand material and spray
The binding agent penetrated on this layer of molding sand material carries out the microwave curing time for 1s~4s.
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.After the completion for the treatment of step (5), that is, when completing most
After the shaping of later layer, the heat time of microwave heating is 30s~60s.After the completion of heating, microwave heating equipment return can be straight
Connect the taking-up waterglass sand mold from workbench.
For further description the inventive method, it is expanded on further below with specific embodiment.
Embodiment 1
The mesh mound core blade of 70 mesh~140, blade height 78.5mm, maximum outer ring are shaped using the inventive method
A diameter of 170mm, Fig. 2 are waterglass nice foundry sand core contour structures schematic diagrames in the embodiment of the present invention.
Detailed process is as follows：
(1) according to the appearance profile size of sodium silicate sand core to be formed, water glass to be formed is set up by pro/E softwares
The three-dimensional entity model of glass core, using Z axis as shaping direction, sets shaping thickness as 0.18mm.
(2) one layer of molding sand material is first laid, powdering speed during one layer of molding sand material of laying is 0.4m/s.Recycle shower nozzle
In molding sand material surface jet binder to form current layer contour patterns, the binding agent is the mixed of waterglass and polyvinyl alcohol
Close solution.In the binding agent, the addition of polyvinyl alcohol is the 1.5% of waterglass quality.The viscosity of binding agent is 8mPa
S, the surface tension of binding agent is 45mN/m, and the injection volume of binding agent once is corresponding current layer molding sand material voidage
15%..The sweep speed of shower nozzle is 1.5m/s.Molding sand material is nice foundry sand.Molding sand material particle size range is 70 mesh~140
Mesh.
(3) microwave heating is carried out to current layer contour patterns, makes waterglass dry solidification and then bond molding sand material solid
It is melted into current layer sand mold profile.The power of microwave heating is 600W.Microwave heating equipment is placed in directly over workbench, when its decline
During to table surface, workbench can be sealed, prevent microwave leakage, to each layer of molding sand material and be injected in the layer
Binding agent on molding sand material carries out the microwave curing time for 4s.
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.After the completion for the treatment of step (5), that is, when completing most
After the shaping of later layer, the heat time of microwave heating is 55s.After the completion of heating, microwave heating equipment return can be directly from work
Make to take out sodium silicate sand core in platform.And its surface is cleared up, obtain waterglass mound core.
Embodiment 2
The mesh zircon sand core blade of 140 mesh~240 is shaped using the inventive method, blade height 78.5mm is maximum outer
Loop diameter is 170mm, and Fig. 2 is sodium silicate sand core contour structures schematic diagram in the embodiment of the present invention.
Detailed process is as follows：
(1) according to the appearance profile size of sodium silicate sand core to be formed, water glass to be formed is set up by pro/E softwares
The three-dimensional entity model of glass core, using Z axis as shaping direction, sets shaping thickness as 0.12mm.
(2) one layer of molding sand material is first laid, powdering speed during one layer of molding sand material of laying is 0.1m/s.Recycle shower nozzle
In molding sand material surface jet binder to form current layer contour patterns, the binding agent is the mixed of waterglass and polyvinyl alcohol
Close solution.In the binding agent, the addition of polyvinyl alcohol is the 4% of waterglass quality.The viscosity of binding agent is less than 8mPa
S, the surface tension of binding agent is 65mN/m, and the injection volume of binding agent once is corresponding current layer molding sand material voidage
45%.The sweep speed of shower nozzle is 0.5m/s.Molding sand material is zircon sand.Molding sand material particle size range is 140 mesh~240
Mesh.
(3) microwave heating is carried out to current layer contour patterns, makes waterglass dry solidification and then bond molding sand material solid
It is melted into current layer sand mold profile.The power of microwave heating is 1500W.Microwave heating equipment is placed in directly over workbench, when under it
When being down to table surface, workbench can be sealed, prevent microwave leakage, to each layer of molding sand material and be injected in this
Water glass solution on layer molding sand material carries out the microwave curing time for 2s.
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.After the completion for the treatment of step (5), that is, when completing most
After the shaping of later layer, the heat time of microwave heating is 40s.After the completion of heating, microwave heating equipment return can be directly from work
Make to take out sodium silicate sand core in platform.And its surface is cleared up, obtain waterglass zircon sand core.
Embodiment 3
The sand mold of a straight spur gear, gear height 50mm are shaped using the inventive method, maximum race diameter is
300mm, Fig. 3 are straight spur gear contour structures schematic diagrames in the embodiment of the present invention.
Detailed process is as follows：
(1) according to straight spur gear character and forming process conditions, by pro/E Software for Design and gear water glass is set up
The three-dimensional entity model of glass sand mold, is highly 800mm, length and width is 340mm, using Z axis as shaping direction, sets shaping layer
Thickness is 0.25mm.
(2) one layer of molding sand material is first laid, powdering speed during one layer of molding sand material of laying is 0.3m/s.Recycle shower nozzle
In molding sand material surface jet binder to form current layer contour patterns, the binding agent is the mixed of waterglass and polyvinyl alcohol
Close solution.In the binding agent, the addition of polyvinyl alcohol is the 3% of waterglass quality.The viscosity of binding agent is less than 7mPa
S, the surface tension of binding agent is 56mN/m, and the injection volume of binding agent once is corresponding current layer molding sand material voidage
30%.The sweep speed of shower nozzle is 1m/s.Molding sand material is zircon sand.Molding sand material particle size range is the mesh of 100 mesh~200.
(3) microwave heating is carried out to current layer contour patterns, makes waterglass dry solidification and then bond molding sand material solid
It is melted into current layer sand mold profile.The power of microwave heating is 1000W, and microwave heating equipment is placed in directly over workbench, when under it
When being down to table surface, workbench can be sealed, prevent microwave leakage, to each layer of molding sand material and be injected in this
Binding agent on layer molding sand material carries out the microwave curing time for 3s.
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.After the completion for the treatment of step (5), that is, when completing most
After the shaping of later layer, the heat time of microwave heating is 30s.After the completion of heating, microwave heating equipment return can be directly from work
Make to take out waterglass sand mold in platform.And its surface is cleared up.
In the present invention, the original molding sand of certain grain size distribution scope is used for formed powder material, with waterglass and poly- second
The mixed solution of enol is binding agent, is sprayed binding agent into original layer of sand by micro-injection mode, using microwave heating side
Formula solidifies waterglass dehydration and bonds original molding sand, so as to form layer profile, in this way and successively stack shaping, obtains
Waterglass sand mold (core).Microwave heat hardening water-glass sand can make the addition of waterglass be down to less than 1.5%.Waterglass is added
Amount is greatly reduced, then old sand collapsibility performance is lifted, and peeling difficulty, reuse regeneration difficulty are then greatly reduced.Microwave heating is hard
Change the shortcoming that water virus can overcome common conductive formula to heat water virus, with homogeneous heating, firing rate it is fast,
The handling low advantage of the good, cost of raw material.Microwave heat hardening water-glass sand remains the advantage of water-glass sand, overcomes again
Existing CO2The respective shortcoming of hardened sodium silicate sand and ester hardened sodium silicate sand.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (12)
1. a kind of waterglass sand mold quick forming method, it is characterised in that using molding sand material and binding agent as raw material, molding sand not with
Binding agent is mixed, and it specifically includes following steps：
(1) according to the appearance profile size of waterglass sand mold to be formed, the 3D solid of waterglass sand mold to be formed is set up
Model, using Z axis as shaping direction, setting shaping thickness；
(2) one layer of molding sand material is first laid, recycles shower nozzle in molding sand material surface jet binder to form current layer profile
Pattern,
The binding agent is to add polyvinyl alcohol in the mixed solution of waterglass and polyvinyl alcohol, water glass solution to form bonding
Agent, can effectively reduce the waterglass sand mold/wettability power of core at normal temperatures, polyvinyl alcohol, which also serves as binding agent, can effectively reduce water
Glass sand mold/wicking surface powder phenomenon-tion；
(3) to current layer contour patterns carry out microwave heating, make waterglass dry solidification so that by molding sand material adhesive solidification into
Current layer sand mold profile；
(4) microwave heating is stopped, workbench moves down a thickness height along Z-direction；
(5) repeat step (2)~(4) are until the shaping of waterglass sand mold.
2. a kind of waterglass sand mold quick forming method as claimed in claim 1, it is characterised in that in the step (2), institute
State in binding agent, the addition of polyvinyl alcohol is the 1%~4% of waterglass quality.
3. a kind of waterglass sand mold quick forming method as claimed in claim 1 or 2, it is characterised in that the step (2)
In, the viscosity of the binding agent is less than 10mPas.
4. a kind of waterglass sand mold quick forming method as claimed in claim 3, it is characterised in that in the step (2), institute
The surface tension for stating binding agent is 40mN/m~70mN/m.
5. a kind of waterglass sand mold quick forming method as claimed in claim 1, it is characterised in that in the step (2), institute
It is the 10%~50% of corresponding current layer molding sand material voidage to state the injection volume of binding agent once.
6. a kind of waterglass sand mold quick forming method as described in claim 1 or 5, it is characterised in that the step (2)
In, the sweep speed of the shower nozzle is 0.5m/s~2m/s.
7. a kind of waterglass sand mold quick forming method as claimed in claim 1, it is characterised in that micro- in the step (3)
Wave heating power is 300W~2000W, and the heat time is 1s~4s.
8. a kind of waterglass sand mold quick forming method as described in claim 1 or 7, it is characterised in that last layer sprays
After the completion of binding agent, microwave heating time is 30s~60s.
9. a kind of waterglass sand mold quick forming method as described in claim 1 or 7, it is characterised in that the step (2)
In, the molding sand material includes cleaning the one or more in silica sand, nice foundry sand and zircon sand.
10. a kind of waterglass sand mold quick forming method as described in claim 1,2 or 5, it is characterised in that the step
(2) in, the molding sand material particle size range is the mesh of 70 mesh~240.
11. a kind of waterglass sand mold quick forming method as claimed in claim 1, it is characterised in that in the step (1),
Shaping thickness is set as 0.1mm~0.3mm.
12. a kind of waterglass sand mold quick forming method as described in claim 1 or 11, it is characterised in that the step (2)
In, powdering speed during one layer of molding sand material of laying is 0.1m/s~0.5m/s.
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| JP6774020B2 (en) * | 2016-09-29 | 2020-10-21 | セイコーエプソン株式会社 | 3D model manufacturing equipment and 3D model manufacturing method |
| CN106799461B (en) * | 2016-12-26 | 2018-12-07 | 华中科技大学 | A kind of casting mold three-dimensional spray printing manufacturing process |
| CN107127306B (en) * | 2017-06-07 | 2024-01-19 | 第一拖拉机股份有限公司 | Device for 3D printing precision casting mold shell and use method |
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