CN104493101B - Rapid prototyping method for high-precision ester cured water glass sand mold/core - Google Patents
Rapid prototyping method for high-precision ester cured water glass sand mold/core Download PDFInfo
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- CN104493101B CN104493101B CN201410817773.9A CN201410817773A CN104493101B CN 104493101 B CN104493101 B CN 104493101B CN 201410817773 A CN201410817773 A CN 201410817773A CN 104493101 B CN104493101 B CN 104493101B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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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
- B22C1/18—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 of inorganic agents
- B22C1/186—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 of inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
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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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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a rapid prototypingmethod for a high-precision ester cured water glass sand mold/core, and belongs to the technical field of sand mold/core prototyping. The method comprises the following steps: firstly establishing a CAD geometry solid model of the sand mold/core, performing layered discretization, generating a moving trajectory file of each discrete level dripping device and guiding the moving trajectory file of each discrete level dripping device into a controller, and recording the number n of discrete layers; evenly mixing the mold/sand core with water glass by using a mixing device; flatly spreading the mold/core sand wrapped by the water glass on a lifting working platform by a spreading device; and dripping composite organic ester according to the extracted moving trajectory of a first discrete level by the dripping device, after the first discrete level is completed, enabling the lifting working platform to move down, sequentially completing the dripping working procedures of the follow-up discrete levels, curing for 1h to 8h, and taking the mold core out. The rapid prototyping method provided by the invention have the advantages of being capable of shortening the manufacturing cycle of the sand mold/core, improving the prototyping precision and performance, increasing the repeated utilization rate of used sand, and reducing the production cost.
Description
Technical field
A kind of the present invention relates to sand mold/core field shaping technique, more particularly, it relates to high accuracy ester solidification water-glass sand
The quick molding method of type/core, the method is particularly suited for solidifying the rapid shaping of the sand mold/core of waterglass with organic ester.
Background technology
Water-glass sand is the molding sand that 21 century foundary industry most possibly realizes Green foundry production.However, it is different at present
Water-glass sand hardening process there is respective deficiency.For example, there is energy consumption greatly in Ordinary hardening water-glass sand, and labour intensity is high,
And the problems such as sand mold/in-core outer baking degree inequality；CO2It is poor to there is collapsibility in air blowing hardened sodium silicate sand, and regenerating used is difficult,
The defect such as hardening process is unstable；Powder hardened sodium silicate sand has that waterglass addition is higher, and collapsibility performance is not good, and powder
With serious pollution deficiency；And the requirement to mold materials for the traditional microwave heat hardening water-glass sand is then higher.
Chinese Patent Application No. 99101176.7 discloses a kind of ester solidification sodium silicate sand compound and vacuum conversion is hard
Change method, in this application case moulding sand mixture, waterglass addition is the 2.0%～5.5% of roughing sand weight, and special organic ester adds
Measure 0.1%～2.2% for roughing sand weight, special organic fast ester addition is roughing sand, waterglass, special organic ester add total amount
0%～50%.Compared with resin sand foundry goods, castings production cost reduces by 20% about to this application case；With CO2- water-glass sand
Hardening process is compared, and joint hardening process waterglass addition reduces 40%～60%, and molding sand high-temperature residual strength reduces by 40%
～60%.However, organic ester residual quantity is high in the reclaimed sand of this application case, and the increase with regeneration times, remain organic
Ester amount is gradually increased, and leads to the up time of soluble glass of high modulus old sand to shorten.Under extreme conditions, mixed self-hardening sand wink
Between harden into a disk loose sand, do not possess cementitiousness.For ensureing the necessary up time, produce and can only be less than using modulus
2.0 waterglass.However, using pole low modulus water glass, the setting rate of its self-hardening sand is very slow, and this makes the system of sand mold/core
Make excessive cycle.
Additionally, all indispensable part model of preparation of traditional waterglass sand mold/core and sand mold/core mold, this makes
Longer, the high expensive that manufactures and designs the cycle of new product.Sand mold/core quick molding method eliminates and manufactures required mould, and
The cycle that manufactures and designs of part can be shortened, reduce development cost, be widely used in new product development.
Chinese patent publication No. CN 102343415 B, CN 103567352 A, CN 103551492 A etc. disclose and adopt
With the laser sintered method preparing sand mold/core.However, resin makees the sand mold/core of binding agent preparation, and to there is gas forming amount larger, pouring
Toxic gas is distributed, the problems such as environment is worked the mischief during casting.Chinese patent publication No. CN 104001862 A discloses
A kind of rapid forming system of water-soluble core and manufacturing process, this application case is using nozzle successively to the core sand compound spray completed
Penetrate inorganic salt solution droplet, the moisture in evaporation solution makes inorganic salts crystallization obtain final inorganic salts sand at a certain temperature
Core.For the foundry goods with complicated inner cavity or bending duct, the core that this application case prepares is easy to decore, so should
Application case is mainly used in the preparation of core, but because inorganic salts binding agent core has sucting wet problem, leads to it to be not particularly suited for
The preparation of sand mold.
Chinese patent publication No. CN 103600039 A and CN 103586410 A discloses molding sand injection solidification and increases material
Manufacturing equipment and method.It obtains the aspect details of every layer of casting mold first and determines control information, and then basis is worked as
Front section information selection shower nozzle carries out different materials along current layer scanning pattern and the molding sand (or chill material) of mesh number is accurate
Binding agent and curing agent are accurately successively sprayed using injection apparatus by injection simultaneously.The method can achieve different parts sand mold
The differentiation manufacture of material, but there is also some problems, such as：
1) it is difficult to binding agent or the manufacture of the higher sand mold of curing agent viscosity：For the larger binding agent of viscosity or solidification
Agent, after nozzle injection, because spreading kinetics characteristic is poor, binding agent and curing agent finally concentrate on sand grains top, such sand
Grain bottom and surrounding lack binding agent or curing agent, and between sand grains and sand grains, bonded bridge is less, and the sand mold intensity of shaping is relatively low；
2) it is difficult to the sand mold of processability significant changes in time：For part molding sand, solidification process Sand
Intensity significant changes in time, such as solidification early strength is relatively low, is subsequently increased dramatically, and after a period of time, intensity begins to decline again.
For such molding sand according to injection solidification increasing material manufacturing, there is the sand bond first solidifying and have started to decline and the injection of sand mold
It is molded also unclosed problem；
3) it is difficult to ensure that sand mold precision：Because sand grains and iron powder are ejected into workbench by nozzle, sand grains is with freely falling body
Mode falls work top, ultimately forms continuous " small mountain ", therefore, the thickness and precision successively manufacturing is not high.
Content of the invention
1. invent technical problem to be solved
It is an object of the invention to solution problems with：1) existing waterglass sand mold/core need to adopt mould molding, and ester is solid
Changing water-glass sand increases with recovered frequency, and old sand recovery difficult is big；2) existing sand mold/core injection solidification increasing material manufacturing method system
Manufacturing accuracy is not high；3) for the sand mold/core of the higher sand mold/core of binding agent or curing agent viscosity, performance significant changes in time
Preparation effect on driving birds is not good；Provide a kind of rapid prototyping system and the method that high accuracy ester solidifies waterglass sand mold/core.Using this
The technical scheme that invention provides, can shorten the manufacturing cycle of sand mold/core, improve its formed precision and performance moreover it is possible to improve old
Sand recycling rate of waterused, reduces production cost.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is：
A kind of high accuracy ester of the present invention solidifies the quick molding method of waterglass sand mold/core, and its step is：
Step one, set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect and drip
The running orbit file of liquid device, and this running orbit file is imported in the controller of dropper by data-interface, record
Discrete layer number of plies n；
Step 2, with mixing device, type/core sand is mixed with waterglass；
Step 3, with laying device by step 2 coat waterglass type/core sand be laid in self-powered platform；
Step 4, dropper drip compound organic ester according to the ground floor discrete aspect running orbit extracting, and treat first
After the completion of layer scattering aspect, the descending 0.1mm～1mm of self-powered platform, it is sequentially completed the dropping liquid operation of subsequently discrete aspect, until
The dropping liquid operation of all discrete aspects completes；
After the completion of step 5, step 4 operation, treat sand mold/core solidification 1h-8h, take out core.
Further, the compound organic ester described in step 4 includes fast ester and slow ester, and described fast ester is glycerine list vinegar
Acid esters, ethylene glycol monoacetate, the mixture of propylene carbonate, diglycol monotertiary acetate or four any combination, described is slow
Ester is diethylene glycol acetate, glyceryl diacetate or both mixtures.
Further, in the compound organic ester of the i-th layer scattering aspect dropping, slow ester s with the proportionate relationship of fast ester f is：f/
(s+f)=(i-1)/(n-1).
Further, described compound organic ester addition is the 1%～2% of molding sand total amount.
Further, modulus of water glass used by step 2 is 1.5～2.5.
Further, in step 2, type/core sand used is quartz sand, mullite sand, olivine sand or any group of three
The mixture closing, the granularity of above-mentioned type/core sand is 70/140 mesh.
A kind of high accuracy ester of the present invention solidifies the rapid prototyping system of waterglass sand mold/core, including casing, batch mixing dress
Put, join liquid storehouse, dropper, laying device, self-powered platform and controller, described mixing device, join liquid storehouse and be respectively provided with
Two upper lateral parts in casing, the bottom of mixing device is provided with discharging opening, and the lower section of this discharging opening is provided with material feeding platform, described paving
Material device is arranged between material feeding platform and discharging opening；Described liquid storehouse of joining is connected with dropper by woven hose, and this dropping liquid fills
Put carry on moving guide rail, dropper is controlled by the controller and slides along moving guide rail, described moving guide rail is led with fixation
Rail is connected, and the also controlled device of this moving guide rail controls along fixing slide；The two ends of described fixing guide rail are separately fixed at case
Inwall before and after body；Described working chamber is arranged on the lower section of dropper, is provided with self-powered platform in this working chamber, described
Self-powered platform is connected with by motor-driven piston.
3. beneficial effect
The technical scheme being provided using the present invention, compared with existing known technology, has following remarkable result：
(1) a kind of high accuracy ester of the present invention solidifies the quick molding method of waterglass sand mold/core, and it is first by type/core
Sand is mixed with waterglass, it is to avoid because waterglass viscosity is higher, after droplet ejection, waterglass sprawls effect in sand grain surface
Not good problem, improves sand mold/core performance, will mix rear profile/core sand using laying device and successively spread on self-powered platform
Open, thickness is controlled, solve the problems, such as that traditional/core sand sprays from shower nozzle and cause sand mold precision not high；
(2) a kind of high accuracy ester of the present invention solidifies the quick molding method of waterglass sand mold/core, and it successively drips difference
The compound organic ester of component proportion, that is, first moulding section solidified with slow ester, aftershaping part is solidified with fast ester, has both solved same group
Point problem that the sand mold that organic ester curing agent leads to because of molding time difference/core strength character changed with hardening time, shortens again
Sand mold/core manufacturing cycle；
(3) a kind of high accuracy ester of the present invention solidifies the quick molding method of waterglass sand mold/core, using low modulus water glass
Glass is as binding agent, it is to avoid what organic ester solidification water-glass sand up time during old sand repeated regeneration gradually decreased asks
Topic, improves old sand repeat usage, reduces production cost；And it is combined the weak basic condition in low modulus water glass for the organic ester
Lower hydrolysis has obtained organic acid and alcohol, so react with waterglass promote waterglass dehydration harden, whole forming process need not plus
Heat, therefore effectively reduces power consumption of polymer processing.
Brief description
Fig. 1 is a kind of flow chart of the quick molding method of high accuracy ester solidification waterglass sand mold/core of the present invention；
Fig. 2 is a kind of structural representation of the rapid prototyping system of high accuracy ester solidification waterglass sand mold/core of the present invention.
Label declaration in schematic diagram：
1st, casing；2nd, mixing device；21st, discharging opening；31st, join liquid storehouse；32nd, woven hose；33rd, dropper；41st, movement is led
Rail；42nd, fixing guide rail；51st, material feeding platform；52nd, laying device；61st, molded discrete layer；62nd, mixed material；71st, working chamber；
72nd, piston；73rd, self-powered platform；8th, controller；81st, data-interface.
Specific embodiment
For further appreciating that present disclosure, with reference to embodiment, the invention will be further described.
Embodiment 1
Referring to Fig. 2, a kind of high accuracy ester of the present embodiment solidifies the rapid prototyping system of waterglass sand mold/core, including case
Body 1, mixing device 2, join liquid storehouse 31, dropper 33, laying device 52, self-powered platform 73 and controller 8.Described batch mixing
Device 2, join two upper lateral parts that liquid storehouse 31 is respectively arranged in casing 1, wherein, mixing device 2 equipped with type/core sand and waterglass,
This mixing device 2 is used for being sufficiently mixed type/core sand and waterglass.The bottom of mixing device 2 is provided with discharging opening 21, this discharging opening
21 lower section is provided with material feeding platform 51, and the mixed material 62 mixing is fallen material feeding platform 51 from discharging opening 21.Laying device 52
Positioned at the lower section of discharging opening 21, the top of material feeding platform 51, moved horizontally by Motor drive.Fall the mixture on material feeding platform 51
Material 62 is laid on self-powered platform 73 by laying device 52, and laying device 52 often moves one back and forth i.e. in molded discrete layer
One layer of stone on 61.Described liquid storehouse 31 of joining is connected with dropper 33 by woven hose 32, and this dropper 33 carry is moving
On dynamic guide rail 41, the controlled device 8 of dropper 33 controls and slides along moving guide rail 41, described moving guide rail 41 and fixing guide rail
42 are connected, and moving guide rail 41 is mutually perpendicular to fixing guide rail 42, and this also controlled device 8 of moving guide rail 41 controls along fixing guide rail 42
Slide, the data-interface 81 of controller 8 is connected with host computer, the CAD that sand mold/core that host computer generates downloaded by this controller 8 is several
What physical model is layered the running orbit file of the discrete discrete aspect dropper obtaining to control dropper 33 in level
Direction is moved, and the two ends of fixing guide rail 42 are separately fixed at the inwall in front and back of casing 1.Described working chamber 71 is arranged on dropper
33 lower section, is provided with self-powered platform 73 in this working chamber 71, described self-powered platform 73 with by motor-driven piston
72 are connected, and piston 72 drives and moves under self-powered platform 73 in the vertical direction.The rapid prototyping system structure letter of the present embodiment
Single, reasonable in design and low cost of manufacture, easy to utilize.
Referring to Fig. 1, using above-mentioned rapid prototyping system, the high accuracy ester of the present embodiment solidifies the fast of waterglass sand mold/core
Fast forming method, detailed process is：
(1) set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect dropping liquid dress
Put 33 running orbit file, and this running orbit file is imported by data-interface 81 in the controller 8 of dropper 33, note
Record discrete layer number of plies n.
(2) waterglass that 100 part of 70/140 mesh quartz sand and 3 parts of moduluses are 1.5 is mixed in mixing device 2,
Type/core sand is first mixed by the present embodiment with waterglass, it is to avoid because waterglass viscosity is higher, after droplet ejection, waterglass exists
Sand grain surface sprawls the problem of effect on driving birds is not good, is easy to improve sand mold/core performance.
(3) with laying device 52, the mixed material 62 of the cladding mixing waterglass is laid in self-powered platform 73
On, the present embodiment is successively spread out mixing rear profile/core sand using laying device 52 on self-powered platform 73, and thickness is controlled, solution
Traditional/core sand of having determined sprays from shower nozzle and causes the not high problem of sand mold precision.
(4) dripped diethylene glycol (DEG) two acetic acid according to the ground floor discrete aspect running orbit that host computer generates by dropper 33
Ester and the compound organic ester of diglycol monotertiary acetate composition, compound organic ester total amount is the 1% of molding sand, the dropping liquid of dropper 33
Speed be 150/min, its nozzle rate travel be 0.8mm/s, and ground floor be combined organic ester in diglycol monotertiary acetate/
(diethylene glycol acetate+diglycol monotertiary acetate) is 0%；After the completion for the treatment of the discrete aspect of ground floor, the descending certain work of lifting platform
Make distance, operating distance length be 0.1mm, be sequentially completed the dropping liquid operation of subsequently discrete aspect, and i-th layer dripped be combined organic
In ester, diglycol monotertiary acetate/(diethylene glycol acetate+diglycol monotertiary acetate) is (i-1)/(n-1), until all discrete
The dropping liquid operation of aspect completes.
(5) after the completion of dropping liquid operation, treat sand mold/core solidification 2h, taking out sand mold/core can use.
What deserves to be explained is, the low modulus water glass that the present embodiment is 1.5 using modulus, as binding agent, can avoid organic
Ester solidifies the water-glass sand problem that the up time gradually decreases during old sand repeated regeneration, improves old sand and reuses
Rate, reduces production cost.And with regard to using low modulus water glass, the sand mold/slow problem of core setting rate, inventor points out：
Because the present embodiment successively drips the compound organic ester of different component proportioning, for the part being first molded, mainly solidified with slow ester,
Waterglass contacts and starts with slow ester curing reaction, and the present embodiment is compared to general forming method, the requirement to setting rate
Relatively low, therefore, without the problem that consideration low modulus water glass setting rate is slow, there is the sufficiently long time to allow sand mold/core to have solidified
Entirely；And the part for aftershaping, in view of the required time difference of each discrete layer solidification, (bottom is taken the present embodiment
Between the longest, the superiors' time the shortest), by controlling the ratio of fast ester in the organic ester that each discrete layer instills, be stepped up it
Curing rate, has reached each discrete layer solidification starting point difference, but the close purpose of the end time of arrival final strength, both solved
Sand mold/core the strength character leading to because of molding time difference with component organic ester curing agent of having determined is with asking of changing of hardening time
Topic, shortens sand mold/core manufacturing cycle again.The present embodiment water under the weak basic condition of low modulus water glass by compound organic ester
Solution obtains organic acid and alcohol, so react with waterglass promote waterglass dehydration harden, and by drop velocity, nozzle move
The control of speed, so that whole forming process need not heat, effectively reduces power consumption of polymer processing.
Embodiment 2
A kind of high accuracy ester of the present embodiment solidifies the rapid prototyping system of waterglass sand mold/core, substantially with embodiment 1,
Now its forming process is summarized as follows：
(1) set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect dropping liquid dress
The running orbit file put, and imported in the controller of dropper by data-interface, record discrete layer number of plies n.
(2) waterglass that 80 part of 70/140 mesh mullite sand and 5 parts of moduluses are 2.5 is mixed in mixing device.
(3) with laying device, the type/core sand of mixed cladding waterglass is laid in self-powered platform.
(4) by dropper according to the ground floor discrete aspect running orbit that host computer generates drip glyceryl diacetate and
The compound organic ester of monoacetin, compound organic ester total amount is the 2% of molding sand, and the drop velocity of dropper 33 is 200
Drip/min, its nozzle rate travel is 1.2mm/s, and ground floor is combined monoacetin/(glyceryl diacetate in organic ester
+ monoacetin) it is 0%；After the completion for the treatment of the first discrete aspect, the descending certain operating distance of self-powered platform, operating distance
Length, in 0.5mm, is sequentially completed the dropping liquid operation of subsequently discrete aspect, and i-th layer is dripped glycerine list acetic acid in compound organic ester
Ester/(glyceryl diacetate+monoacetin) is (i-1)/(n-1), until the dropping liquid operation of all discrete aspects completes.
(5) after the completion of dropping liquid operation, treat sand mold/core solidification 8h, taking out sand mold/core can use.
Embodiment 3
A kind of high accuracy ester of the present embodiment solidifies the rapid prototyping system of waterglass sand mold/core, substantially with embodiment 1,
Now its forming process is summarized as follows：
(1) set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect dropping liquid dress
The running orbit file put, and imported in the controller of dropper by data-interface, record discrete layer number of plies n.
(2) waterglass that 120 point of 70/140 mesh olivine sand and 4 parts of moduluses are 1.8 is mixed in mixing device.
(3) with laying device by mixed cladding waterglass type/core sand be laid in self-powered platform.
(4) dripped diethylene glycol (DEG) two acetic acid according to the ground floor discrete aspect running orbit that host computer generates by dropper
The compound organic ester that ester, monoacetin and ethylene glycol monoacetate mix, compound organic ester total amount is molding sand
1.5%, the drop velocity of dropper 33 is 300/min, and its nozzle rate travel is 2mm/s, and ground floor be combined organic
(monoacetin+ethylene glycol monoacetate)/(diethylene glycol acetate+monoacetin+ethylene glycol list acetic acid in ester
Ester) it is 0%；After the completion for the treatment of the first discrete aspect, the descending certain operating distance of self-powered platform, operating distance length in 0.1mm,
It is sequentially completed the dropping liquid operation of subsequently discrete aspect, and i-th layer is dripped (monoacetin+ethylene glycol list in compound organic ester
Acetate)/(diethylene glycol acetate+monoacetin+ethylene glycol monoacetate) be (i-1)/(n-1), until all from
The dropping liquid operation of scattered aspect completes.
(5) after the completion of dropping liquid operation, treat sand mold/core solidification 6h, taking out sand mold/core can use.
Embodiment 4
A kind of high accuracy ester of the present embodiment solidifies the rapid prototyping system of waterglass sand mold/core, substantially with embodiment 1,
Now its forming process is summarized as follows：
(1) set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect dropping liquid dress
The running orbit file put, and imported in the controller of dropper by data-interface, record discrete layer number of plies n.
(2) by mixed sand (30 parts of olivine sand, the mullite sand 60 of 90 point of 70/140 mesh olivine sand and mullite sand
Part) mix in mixing device with the waterglass that 3 parts of moduluses are 1.6.
(3) with laying device by mixed cladding waterglass type/core sand be laid in self-powered platform.
(4) dripped diethylene glycol (DEG) two acetic acid according to the ground floor discrete aspect running orbit that host computer generates by dropper
The compound organic ester that ester, glyceryl diacetate, monoacetin, ethylene glycol monoacetate and propylene carbonate mix,
Compound organic ester total amount is the 1.5% of molding sand, and the drop velocity of dropper 33 is 30/min, and its nozzle rate travel is
0.2mm/s, and ground floor is combined (monoacetin+ethylene glycol monoacetate+propylene carbonate) in organic ester/compound organic
Ester is 0%；After the completion for the treatment of the first discrete aspect, the descending certain operating distance of self-powered platform, operating distance length in 0.1mm,
It is sequentially completed the dropping liquid operation of subsequently discrete aspect, and i-th layer is dripped (monoacetin+ethylene glycol list in compound organic ester
Acetate+propylene carbonate)/it is combined organic ester for (i-1)/(n-1), until the dropping liquid operation of all discrete aspects completes.
(5) after the completion of dropping liquid operation, treat sand mold/core solidification 4h, taking out sand mold/core can use.
A kind of high accuracy ester described in embodiment 1～4 solidifies rapid prototyping system and the method for waterglass sand mold/core, adopts
Successively drip the compound organic ester shaping sand mold/core of different ratio with dropper 33, it is to avoid sand mold/core manufacture needs mould
And lead to the deficiency that product development cost is too high, the construction cycle is long, shorten the manufacturing cycle of sand mold/core, improve sand mold/
The formed precision of core and performance, moreover it is possible to improve old sand recycling rate of waterused, reduce production cost, easy to utilize.
Claims (5)
1. a kind of high accuracy ester solidifies the quick molding method of waterglass sand mold/core, and its step is：
Step one, set up the CAD geometry entity model of sand mold/core, and carry out being layered discrete, generate each discrete aspect dropping liquid dress
The running orbit file put, and this running orbit file is imported in the controller of dropper by data-interface, record discrete
Count n layer by layer；
Step 2, with mixing device, type/core sand is mixed with waterglass；
Step 3, with laying device by step 2 coat waterglass type/core sand be laid in self-powered platform；
Step 4, dropper drip compound organic ester according to the ground floor discrete aspect running orbit extracting, and treat the first leafing
After the completion of scattered aspect, the descending 0.1mm～1mm of self-powered platform, it is sequentially completed the dropping liquid operation of subsequently discrete aspect, until all
The dropping liquid operation of discrete aspect completes, wherein, the ratio of slow ester s and fast ester f in the compound organic ester of the i-th layer scattering aspect dropping
Relation is：F/ (s+f)=(i-1)/(n-1)；
After the completion of step 5, step 4 operation, treat sand mold/core solidification 1h-8h, take out core.
2. a kind of high accuracy ester according to claim 1 solidifies the quick molding method of waterglass sand mold/core, and its feature exists
In：Compound organic ester described in step 4 includes fast ester and slow ester, and described fast ester is monoacetin, ethylene glycol list acetic acid
Ester, the mixture of propylene carbonate, diglycol monotertiary acetate or four any combination, described slow ester is diethylene glycol (DEG) two acetic acid
Ester, glyceryl diacetate or both mixtures.
3. a kind of high accuracy ester according to claim 1 and 2 solidifies the quick molding method of waterglass sand mold/core, and it is special
Levy and be：Described compound organic ester addition is the 1%～2% of molding sand total amount.
4. a kind of high accuracy ester according to claim 3 solidifies the quick molding method of waterglass sand mold/core, and its feature exists
In：Modulus of water glass used by step 2 is 1.5～2.5.
5. a kind of high accuracy ester according to claim 4 solidifies the quick molding method of waterglass sand mold/core, and its feature exists
In：In step 2, type/core sand used is the mixture that quartz sand, mullite sand, olivine sand or three are combined, above-mentioned
The granularity of type/core sand is 70/140 mesh.
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| CN201410817773.9A CN104493101B (en) | 2014-12-24 | 2014-12-24 | Rapid prototyping method for high-precision ester cured water glass sand mold/core |
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| CN105562623B (en) * | 2015-12-31 | 2017-10-24 | 华中科技大学 | A kind of waterglass sand mold quick forming method |
| CN108393430B (en) * | 2017-02-04 | 2020-05-08 | 济南圣泉集团股份有限公司 | Curing agent for casting sodium silicate |
| CN109108212A (en) * | 2018-10-10 | 2019-01-01 | 内蒙古第机械集团股份有限公司 | A kind of environmental protection casting modified organic ester and preparation method |
| JP7156096B2 (en) * | 2019-03-06 | 2022-10-19 | 新東工業株式会社 | Additive Manufacturing Systems and Containers |
| DE102020110289A1 (en) * | 2020-04-15 | 2021-10-21 | Peak Deutschland Gmbh | Process using an inorganic binder for the production of cured three-dimensionally layered moldings for foundry cores and molds |
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| US5257657A (en) * | 1990-07-11 | 1993-11-02 | Incre, Inc. | Method for producing a free-form solid-phase object from a material in the liquid phase |
| US5860575A (en) * | 1996-09-30 | 1999-01-19 | Akin; James Sherill | Stability enhancement of molten solder droplets as ejected from a nozzle of droplet pump |
| CN101439389A (en) * | 2007-11-19 | 2009-05-27 | 上海重型机器冶铸厂 | Method for molding cast steel, method for recycling and regenerating fresh sand and mould sand, and reclaimed sand |
| CN102397991B (en) * | 2011-11-25 | 2013-07-24 | 中国一拖集团有限公司 | Quick manufacturing method for die-free casting sand mold |
| CN104001862B (en) * | 2014-06-16 | 2015-10-21 | 安徽工业大学 | A kind of rapid forming system of water-soluble core and manufacturing process |
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