CN106926453B - A method of laser sintered 3D printing precoated sand is prepared for adhesive with sugar - Google Patents
A method of laser sintered 3D printing precoated sand is prepared for adhesive with sugar Download PDFInfo
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- CN106926453B CN106926453B CN201710128228.2A CN201710128228A CN106926453B CN 106926453 B CN106926453 B CN 106926453B CN 201710128228 A CN201710128228 A CN 201710128228A CN 106926453 B CN106926453 B CN 106926453B
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- sand
- laser sintered
- sugar
- precoated sand
- nice foundry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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Abstract
The invention discloses a kind of methods for preparing laser sintered 3D printing precoated sand with sugar for adhesive, it is characterized in that, after nice foundry sand is washed with water first, it is immersed in the aqueous solution for the cetyl trimethylammonium bromide that mass percentage concentration is 5 ~ 6%, it is placed at room temperature for 48h, it is separated by solid-liquid separation, it is dry, obtain pretreatment nice foundry sand；Then, in the reactor, it is added by mass percentage concentration, water: 38% ~ 44%, white sugar: 2% ~ 6%, pretreatment nice foundry sand: 52% ~ 56%, diethylenetriamines: 0.2% ~ 1.0%, polyethylene glycol: 0.2% ~ 2.0%, the sum of each component is absolutely, strong stirring, temperature rises to 160 ~ 170 DEG C, until moisture evaporates, grinds, 120 meshes are crossed, laser sintered 3D printing precoated sand is obtained.The precoated sand using it is laser sintered can straight forming, good fluidity, formed precision is high, and has simple process, and production cost is low, easy to industrialized production.
Description
Technical field
The present invention relates to a kind of preparation methods of laser sintered 3D printing rapid shaping powder body material, belong to rapid shaping
Material Field, in particular to a kind of with sugar is that adhesive prepares the method for laser sintered 3D printing precoated sand and laser sintered 3D is beaten
It is printed as type.
Background technique
Sugar is refined sugar made of the molasses squeezed out sugarcane and beet, is by each molecular dehydration contracting of glucose and fructose
The disaccharide of irreducibility made of conjunction, is heated to 160 DEG C, is just melted into thick transparent liquid, crystallizes again when cooling.
Extending heating time, sucrose are decomposed into glucose and anhydrofructose.Under 190~220 DEG C of higher temperature, sucrose is just dehydrated
Condensation becomes caramel.Caramel has very strong cementation, can make powder adhesion together, play the role of binder.It adopts
Sugar is used to replace chemical adhesive as adhesive, reduce environmental pollution problem.
Nice foundry sand also known as electric smelting haydite are the advanced substitutes of quartz sand.The advantages of quartz sand be it is widely distributed, it is at low cost
It is honest and clean；But its disadvantage is also quite obvious: first is that the coefficient of expansion is big, casting accuracy is low；Second is that scab is serious, sand removal is tired
It is difficult.Its is studied carefully because being that quartz at different temperature can be there are many allomorphism generation, volume change is big；By refractoriness (quartz
The refractoriness of sand is between 1400~1700 DEG C) limitation, casting part (position that hole, slot and thermal center are concentrated) scab is serious,
It clears up very difficult.Disadvantages mentioned above is particularly acute in the production of large-scale steel-casting.Nice foundry sand can overcome these disadvantages, thus greatly
The quality of casting is improved greatly.Nice foundry sand is to make using fine aluminum vanadine as raw material through techniques such as calcining, electric smelting, granulation, sub-sieves
At.
Precoated sand (coated sand).Sand grain surface is covered with the molding sand or core sand of one layer of hard resin film before moulding.
Have two kinds of coating techniques of cold process and thermal method: cold process is dissolved resin with ethyl alcohol, and methenamine is added during mulling, makes two
Person is coated on sand grain surface, and ethyl alcohol volatilization obtains precoated sand；Sand is preheating to certain temperature by thermal method, and resin is added to make its melting, stirring
So that resin is coated on sand grain surface, adds methenamine aqueous solution and lubricant, it is cooling, broken, sieve to obtain precoated sand.For cast steel
Part, ironcasting.Precoated sand is invented during World War II by German Crow doctor Ning, and technical process is by the heat of powdery
Solidity phenolic resin and nice foundry sand mechanical mixture, when heating, solidify.After develop into and add latent curing with thermoplastic phenolic resin
Agent (methenamine) and lubricant are configured to precoated sand by certain coating technique, and sand grains table is coated on when precoated sand is heated
The resin melting in face, under the action of the methylene that methenamine decomposites, the resin of melting is rapidly transformed by linear structure
The three-dimensional-structure not melted, to make precoated sand curing molding.
Laser sintered 3D printing belongs to a kind of method of increasing material manufacturing.This technique is also to lead to using laser as energy source
Crossing laser beam is sintered the powder of plastics, wax, ceramics, metal or its compound equably in processing plane.On the table
The uniform very thin powder of layer overlay as raw material, laser beam under control of the computer, by scanner with certain speed
It is scanned with energy density by the 2-D data in layering face.After laser beam flying, the powder of corresponding position is just sintered into centainly
The entity lamella of thickness, the place that do not scan still maintain loose powdered.After this layer scanned, then need under
One layer is scanned.Thickness degree i.e. layering thickness is first cut according to object and reduces workbench, powdering roller again spreads powder
It is flat, new one layer of scanning can be started.Repeatedly, until scanning through structure at all levels.Remove excessive powder, and passes through and locate later
Reason, can be obtained product.
In existing moulding material field, since SLS rapid shaping technique has the structure of raw material sources multiplicity and part
Build the time it is shorter the advantages that, therefore have wide application in rapid shaping field.But most of is organic material and composite wood
Expect, discloses a kind of nylon powder material for laser sintering and moulding product in Chinese invention patent CN1379061A, pass through
The improvement of chemical synthesis and technique handles the surface of nylon powder material, and it is excellent to have obtained sintering character, moulded products
Intensity is high, and the product of good toughness simplifies the preparation process of laser sintered nylon material, reduces costs；Chinese invention patent
A kind of laser sintered 3D manufacturing technology stone plastic composite powder end and preparation method thereof is disclosed in CN103881371.
For the application by carbohydrate gum adhesive coating layer to modified nice foundry sand surface, obtaining precoated sand can be directly used laser
It is sintered 3D printing molding.Sprinkling adhesive is not needed in forming process.Advantage is that adhesive dosage greatly reduces, and it is dirty to reduce environment
The quality of dye, product is high.The precoated sand adhesive coating of the technique preparation of the application is uniform, and surface is smooth, good fluidity, is suitble to
Laser sintered 3D printing molding.In addition, preparation method provided by the present application is simple, it is at low cost.
Summary of the invention
Mesh of the invention is to provide a kind of method for preparing laser sintered 3D printing precoated sand with sugar for adhesive, fast rapid-result
Type precoated sand does not need sprinkling binder can Direct Laser scanning molding；
The purpose of the present invention is achieved through the following technical solutions.
A method of laser sintered 3D printing precoated sand being prepared for adhesive with sugar, which is characterized in that this method has
Following processing step:
(1) nice foundry sand pre-processes: after nice foundry sand is washed with water, being immersed in the hexadecane that mass percentage concentration is 5~6%
In the aqueous solution of base trimethylammonium bromide, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, obtain pretreatment nice foundry sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is added by mass percentage concentration, water: 38%~
44%, white sugar: 2%~6%, pretreatment nice foundry sand: 52%~56%, diethylenetriamines: 0.2%~1.0%, poly- second two
Alcohol: 0.2%~2.0%, the sum of each component is that absolutely, strong stirring, temperature rises to 160~170 DEG C, until moisture evaporates
It finishes, grinds, cross 120 meshes, obtain laser sintered 3D printing precoated sand.
The partial size of the nice foundry sand described in step (1) is within the scope of 160~200 mesh.
The solid-to-liquid ratio of the aqueous solution of the nice foundry sand described in step (1) and cetyl trimethylammonium bromide be 1g:5~
Within the scope of 10mL.
The polyethylene glycol described in step (2) is polyethylene glycol 200 or polyethylene glycol 400.
The white sugar described in step (2) is edible soft white sugar or white granulated sugar.
Particle size test method of the present invention is the granularity equivalent diameter size measured using laser particle analyzer.
It is a further object of the present invention to provide laser sintered 3D printing precoated sand on 3D printer molding application, feature
Are as follows: laser sintered 3D printing is formed into the powder supply cylinder that laser sintered 3D printing precoated sand is added to selective laser sintering and moulding machine
In, dusty material is equably layered in processing plane and is heated to processing temperature by powdering idler wheel, and laser issues laser, meter
Calculation machine controls the switch of laser and the angle of scanner, so that laser beam is in processing plane according to corresponding two-dimensional slice shape
Shape is scanned, and after laser beam is inswept, workbench moves down a thickness, then powdering, and laser beam flying obtains repeatedly
Laser sintered part；The mode that wherein laser beam scans in processing plane is subregion scanning, and laser power is 80~100W, is swept
Retouch speed be 1500mm/s, sweep span be 0.1~0.15mm, lift height be 0.10~0.2mm, preheating temperature: 100 DEG C,
Processing temperature is 200~210 DEG C.
Compared with the prior art, the present invention has the following advantages and beneficial effects:
(1) the laser sintered 3D printing precoated sand that obtains of the present invention, using sugar as adhesive coating on nice foundry sand surface,
Environmentally protective, not needing sprinkling binder can straight forming under the conditions of laser sintered.
(2) the laser sintered 3D printing precoated sand that the present invention obtains, the uniform particle sizes of particle, sphericity is high, good fluidity
The characteristics of, property is stablized；Thin-walled model or small parts can be manufactured by this rapid shaping powder material, produce product
With the features such as surface gloss height, intensity is good, and precision is high.
(3) the laser sintered 3D printing precoated sand that the present invention obtains has preparation process simple, and condition is easily controllable, raw
Produce it is at low cost, it is easy to industrialized production, it is easily stored, it is pollution-free the advantages that.
Specific embodiment
Embodiment 1
(1) nice foundry sand pre-processes: after 100g nice foundry sand is washed with water, being immersed in 800mL mass percentage concentration is 5%
In the aqueous solution of cetyl trimethylammonium bromide, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, obtain pretreatment nice foundry sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is separately added into, water: 40mL, white sugar: 5g, it is pre- to locate
Manage nice foundry sand: 54g, diethylenetriamines: 0.5g, polyethylene glycol: 0.5g, strong stirring, temperature rise to 160~170 DEG C, until
Moisture evaporates, and grinding crosses 120 meshes, obtains laser sintered 3D printing precoated sand.
Embodiment 2
(1) nice foundry sand pre-processes: after 1000g nice foundry sand is washed with water, being immersed in 10000mL mass percentage concentration is
In the aqueous solution of 6% cetyl trimethylammonium bromide, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, obtain pretreatment mound
Sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is separately added into, water: 380mL, white sugar: 40g, in advance
Handle nice foundry sand: 560g, diethylenetriamines: 10g, polyethylene glycol: 10g, strong stirring, temperature rise to 160~170 DEG C, directly
It evaporates, grinds to moisture, cross 120 meshes, obtain laser sintered 3D printing precoated sand.
Embodiment 3
(1) nice foundry sand pre-processes: after 1000g nice foundry sand is washed with water, being immersed in 5000mL mass percentage concentration is
In the aqueous solution of 5.5% cetyl trimethylammonium bromide, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, it is precious to obtain pretreatment
Pearl sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is separately added into, water: 440mL, white sugar: 35g, in advance
Handle nice foundry sand: 520g, diethylenetriamines: 2g, polyethylene glycol: 2g, strong stirring, temperature rise to 160~170 DEG C, until
Moisture evaporates, and grinding crosses 120 meshes, obtains laser sintered 3D printing precoated sand.
Embodiment 4
(1) nice foundry sand pre-processes: after 2000g nice foundry sand is washed with water, being immersed in 14000mL mass percentage concentration is
In the aqueous solution of 5% cetyl trimethylammonium bromide, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, obtain pretreatment mound
Sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is separately added into, water: 420mL, white sugar: 20g, in advance
Handle nice foundry sand: 550g, diethylenetriamines: 8g, polyethylene glycol: 8g, strong stirring, temperature rise to 160~170 DEG C, until
Moisture evaporates, and grinding crosses 120 meshes, obtains laser sintered 3D printing precoated sand.
Embodiment 5
(1) nice foundry sand pre-processes: after 500g nice foundry sand is washed with water, being immersed in 4000mL mass percentage concentration is 5%
Cetyl trimethylammonium bromide aqueous solution in, be placed at room temperature for 48h, be separated by solid-liquid separation, it is dry, obtain pretreatment nice foundry sand；
(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is separately added into, water: 195mL, white sugar: 30g, in advance
Handle nice foundry sand: 265g, diethylenetriamines: 5g, polyethylene glycol: 5g, strong stirring, temperature rise to 160~170 DEG C, until
Moisture evaporates, and grinding crosses 120 meshes, obtains laser sintered 3D printing precoated sand.
Application method: laser sintered 3D printing precoated sand is added in the powder supply cylinder of selective laser sintering and moulding machine,
Dusty material is equably layered in processing plane and is heated to processing temperature by powdering idler wheel, and laser issues laser, is calculated
Machine controls the switch of laser and the angle of scanner, so that laser beam is in processing plane according to corresponding two-dimensional slice shape
It is scanned, after laser beam is inswept, workbench moves down a thickness, then powdering, and laser beam flying is swashed repeatedly
Light sintered part；The mode that wherein laser beam scans in processing plane is subregion scanning, and laser power is 80~100W, scanning
Speed is 1500mm/s, and sweep span is 0.1~0.15mm, and lift height is 0.10~0.2mm, preheating temperature: 100 DEG C, is added
Work temperature is 200~210 DEG C.
Claims (4)
- With sugar be the adhesive method for preparing laser sintered 3D printing precoated sand 1. a kind of, which is characterized in that this method have with Lower processing step:(1) nice foundry sand pre-processes: after nice foundry sand is washed with water, being immersed in the cetyl three that mass percentage concentration is 5~6% In the aqueous solution of methyl bromide ammonium, it is placed at room temperature for 48h, is separated by solid-liquid separation, it is dry, obtain pretreatment nice foundry sand；(2) it laser sintered 3D printing precoated sand preparation: in the reactor, is added by mass percentage concentration, water: 38%~44%, White sugar: 2%~6%, pretreatment nice foundry sand: 52%~56%, diethylenetriamines: 0.2%~1.0%, polyethylene glycol: 0.2%~2.0%, the sum of each component is that absolutely, strong stirring, temperature rises to 160~170 DEG C, until moisture is evaporated Finish, grinding crosses 120 meshes, obtains laser sintered 3D printing precoated sand.
- 2. a kind of method for preparing laser sintered 3D printing precoated sand with sugar for adhesive according to claim 1, special Sign is that the partial size of nice foundry sand described in step (1) is within the scope of 160~200 mesh.
- 3. a kind of method for preparing laser sintered 3D printing precoated sand with sugar for adhesive according to claim 1, special Sign is that polyethylene glycol described in step (2) is polyethylene glycol 200 or polyethylene glycol 400.
- 4. a kind of method for preparing laser sintered 3D printing precoated sand with sugar for adhesive according to claim 1, special Sign is that white sugar described in step (2) is edible soft white sugar or white granulated sugar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128228.2A CN106926453B (en) | 2017-03-06 | 2017-03-06 | A method of laser sintered 3D printing precoated sand is prepared for adhesive with sugar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128228.2A CN106926453B (en) | 2017-03-06 | 2017-03-06 | A method of laser sintered 3D printing precoated sand is prepared for adhesive with sugar |
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| CN106926453A CN106926453A (en) | 2017-07-07 |
| CN106926453B true CN106926453B (en) | 2019-04-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108296424B (en) * | 2017-09-27 | 2020-04-10 | 柳州市柳晶科技股份有限公司 | 3D printing precoated sand prepared by taking cellulose as adhesive |
| CN107825706A (en) * | 2017-12-15 | 2018-03-23 | 佛山三维二次方科技有限公司 | The 3D printing technique of thermoplastic macromolecule material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272996A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Sand sticking-resistant precoated sand |
| CN104801656A (en) * | 2015-04-01 | 2015-07-29 | 江守仲 | Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand |
| CN105195667A (en) * | 2015-09-21 | 2015-12-30 | 济南大学 | Preparation method of 3D printing rapid-prototyping precoated sand |
| CN105492138A (en) * | 2013-08-30 | 2016-04-13 | 旭有机材工业株式会社 | Molding method for laminated mold |
-
2017
- 2017-03-06 CN CN201710128228.2A patent/CN106926453B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272996A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Sand sticking-resistant precoated sand |
| CN105492138A (en) * | 2013-08-30 | 2016-04-13 | 旭有机材工业株式会社 | Molding method for laminated mold |
| CN104801656A (en) * | 2015-04-01 | 2015-07-29 | 江守仲 | Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand |
| CN105195667A (en) * | 2015-09-21 | 2015-12-30 | 济南大学 | Preparation method of 3D printing rapid-prototyping precoated sand |
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