CN108296442A - A kind of 3D printing precoated sand moulding process - Google Patents
A kind of 3D printing precoated sand moulding process Download PDFInfo
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- CN108296442A CN108296442A CN201711021900.4A CN201711021900A CN108296442A CN 108296442 A CN108296442 A CN 108296442A CN 201711021900 A CN201711021900 A CN 201711021900A CN 108296442 A CN108296442 A CN 108296442A
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- precoated sand
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Classifications
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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
-
- 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
- B22C1/10—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 for influencing the hardening tendency of the mould material
-
- 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
-
- 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
- B22C9/123—Gas-hardening
Abstract
The invention discloses a kind of 3D printing precoated sand moulding process, include the following steps：A, roughing sand is washed；B, roughing sand pickling；C, roughing sand mixes to obtain mixed sand with auxiliary agent；D, above-mentioned mixed sand is injected by core shooter in mold；E, it is passed through steam into above-mentioned mold, obtains 3D printing precoated sand semi-finished product；F, by above-mentioned 3D printing precoated sand semi-finished product be put into hot air drier carry out heated-air drying curing molding to get to molding 3D printing precoated sand.3D printing precoated sand moulding process of the present invention is simple, and obtained precoated sand intensity is high, high temperature resistance is good, can improve 3D printing workpiece quality, not polluted to environment, energy conservation and environmental protection.The present invention can improve the uniformity of roughing sand overlay film, carry out heated-air drying later using steam step is led to, and so that sand mold dry solidification is molded, setting rate is fast, reduces the rupture rate of precoated sand.
Description
Technical field
The invention belongs to precoated sand field shaping techniques, relate particularly to a kind of 3D printing precoated sand moulding process.
Background technology
Precoated sand：Sand grain surface is covered with the molding sand or core sand of one layer of hard resin film before moulding.There are cold process and Re Fa
Two kinds of coating techniques：Cold process is dissolved resin with ethyl alcohol, and methenamine is added during mulling, and the two is made to be coated on sand grains
Then surface vapors away ethyl alcohol to get precoated sand；Sand is preheating to certain temperature by hot method, adds resin that its melting, stirring is made to make
Resin is coated on sand grain surface, adds methenamine aqueous solution and lubricant, then cooling, broken, sieve to obtain precoated sand.Precoated sand
Mainly for the preparation of steel-casting, ironcasting etc..
3D printing is one kind based on digital model file, with adhesive materials such as powdery metal or plastics, is led to
The technology of object is constructed after the mode successively printed.3D printing is typically to be realized using digital technology file printing machine.
Often be used for modeling in fields such as mold manufacturing, industrial designs, after be gradually available for the direct manufactures of some products, had
Parts made of being printed using this technology.The technology jewelry, footwear, industrial design, building, engineering and construction (AEC),
Automobile, aerospace, dentistry and medical industries, education, GIS-Geographic Information System, civil engineering, gun and other field have
It is applied.
The first mold of conventional cast industry exploitation new product needs, again coremaking, are finally cast at group core, and time-consuming, cost
Height, efficiency are low；3D printing technique is applied in casting, the processes such as mold, coremaking is saved, greatly shortens new production
The product development cycle improves efficiency.But the precoated sand due to being used in conventional casting techniques is in intensity, stability, high temperature resistant etc.
The deficiency of aspect of performance, substitute traditional precoated sand use using 3D printing precoated sand becomes inexorable trend in 3D printing technique.
China Patent No. " 201510602060.5 " discloses a kind of 3D printing rapid shaping precoated sand preparation method,
It is disadvantageous in that its molding obtained precoated sand high temperature resistance is poor and rupture rate height.Therefore it is badly in need of a kind of 3D printing overlay film
The moulding process of sand solves the problems, such as that precoated sand heat-resisting quantity in 3D printing is poor in the prior art, rupture rate is high.
Invention content
The object of the present invention is to provide a kind of 3D printing precoated sand moulding process.
To achieve the above object, the technical scheme is that：
A kind of 3D printing precoated sand moulding process, includes the following steps：
A, it is put into after rinsing roughing sand with clear water well in thermostatic drying chamber dry；
B, the roughing sand after above-mentioned drying is subjected to pickling processes, the roughing sand after pickling is done again after being rinsed well with clear water
It is dry, obtain pretreatment roughing sand after crossing 60 mesh sieve；
C, above-mentioned pretreatment roughing sand is added in the sand mixer that temperature is 150 DEG C -300 DEG C, and is mixed after calcium stearate is added
Sand 20min-30min continues to stand after stirring 10min then by sand mixer slow cooling to curing agent is added after 140 DEG C
30min-40min；By sand mixer slow cooling to 80 DEG C -100 DEG C after standing, inorganic bond is added, mixed sand is obtained after stirring；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 3min-5min to be passed through the time, then stops 3min；Continue to be passed through
100 DEG C of steam 2min-3min；Obtain 3D printing precoated sand semi-finished product；
F, by above-mentioned 3D printing precoated sand semi-finished product be put into hot air drier carry out heated-air drying curing molding to get to
It is molded 3D printing precoated sand.
Further, clear water washing time is 30min-50min in step A, and drying temperature is 60 in thermostatic drying chamber
℃-70℃。
Further, pickling time is 26-34min in step B.
Further, the amount for the calcium stearate being added in step C is to pre-process the 3%-7% of roughing sand quality；It is added
The amount of curing agent is to pre-process the 5%-10% of roughing sand quality；The amount of the inorganic binder of addition is pretreatment roughing sand quality
40%-56%.
Further, curing agent component includes 10-20 parts of phenolic resin, polyvinyl butyral 8-18 in parts by weight
Part, 4-12 parts of polyvinyl alcohol, 5-10 parts of water-soluble silicon oil, 3-8 parts of triethanolamine, 10-20 parts of polyacrylamide, coco amine 2-8
Part, 5-15 parts of paraffin oil, 4-12 parts of carboxymethyl cellulose, 4-10 parts of acrylic resin powder, 3-9 parts of titanium dioxide, molybdenum disulfide
6-12 parts and 20-30 parts of deionized water.
Further, inorganic binder component includes 20-40 parts of polyvinyl acetate, 5-15 parts of cracking resistances in parts by weight
Reinforcing fiber, 4-12 parts of water-soluble silicon fat liquor, 5-10 parts of palygorskite powder and 3-9 parts of sodium carbonate.
Further, the rotating speed of sand mixer is 300-500 revs/min in step C.
Further, stir speed (S.S.) is 2000-4000 revs/min after inorganic binder is added in step C, and mixing time is
10min-30min。
Further, the temperature of hot air drier is 130 DEG C -150 DEG C in step F, hot-wind-drying time 30min-
40min。
Compared with prior art, it is an advantage of the invention that：
3D printing precoated sand moulding process of the present invention is simple, and obtained precoated sand intensity is high, high temperature resistance is good, Neng Gouti
High 3D printing workpiece quality does not pollute environment, energy conservation and environmental protection.Wherein, the inorganic bond added in the present invention can
The adhesive force of precoated sand is significantly improved, while the high temperature resistance of precoated sand can also be improved；The curing agent added in the present invention
The adhesive strength that precoated sand can be improved improves the weatherabilities such as heat resistance, the resistance to ag(e)ing of precoated sand, extends precoated sand
Service life.The present invention can improve the uniformity of roughing sand overlay film, carry out heated-air drying later, make sand using steam step is led to
Type dry solidification is molded, and setting rate is fast, reduces the rupture rate of precoated sand.
Wherein, the precoated sand being prepared through the invention can bear stronger tensile strength at normal temperatures and bending resistance is strong
Degree, respectively in 7.0MPa-7.4MPa, 16.0MPa-16.5MPa, precoated sand more in the prior art has lower rupture rate,
Rupture rate has more preferably in 0.8%-0.86%, and with resistance to 240 DEG C -249 DEG C of high temperature precoated sand more in the prior art
High temperature resistance.
Specific implementation mode
Technical solution in the embodiment of the present invention is subjected to clear, complete description below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
All other embodiment for being obtained without making creative work of technical staff, belong to the guarantor of the present invention
Protect range.
Embodiment 1
3D printing precoated sand moulding process includes the following steps in the present embodiment：
A, it is put into after roughing sand being rinsed 30min with clear water dry in 60 DEG C of thermostatic drying chamber；
B, the roughing sand after above-mentioned drying is immersed in progress pickling 30min processing in sulfuric acid solution, the roughing sand after pickling is used
Clear water is dried again after rinsing well, and pretreatment roughing sand is obtained after crossing 60 mesh sieve；
C, it is 150 DEG C, in the sand mixer that rotating speed is 300 revs/min by above-mentioned pretreatment roughing sand addition temperature, and mixing is added
Mulling 20min after the calcium stearate of chiltern amount 3%, then by sand mixer slow cooling to addition mixed sand quality 5% after 140 DEG C
Curing agent, continue stir 10min after stand 30min；By sand mixer slow cooling to 80 DEG C after standing, mixed sand quality is added
40% inorganic bond, the stir speed (S.S.) for adjusting sand mixer are 2000 revs/min, and mixed sand is obtained after stirring 10min；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 3min to be passed through the time, then stops 3min；Continue to be passed through 100 DEG C
Steam 2min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into the hot air drier that hot blast temperature is 130 DEG C and carry out hot air drying
Dry curing molding, heated-air drying 30min to get to molding 3D printing precoated sand.
In the present embodiment, curing agent component includes by 10 parts of phenolic resin, 8 parts of polyvinyl alcohol in parts by weight in step C
Butyral, 4 parts of polyvinyl alcohol, 5 parts of water-soluble silicon oils, 5 parts of paraffin oils, 3 parts of triethanolamines, 10 parts of polyacrylamides, 2 portions of cocounut oil
Amine, 4 parts of carboxymethyl celluloses, 6 parts of molybdenum disulfide, 4 parts of acroleic acid resin powder, 3 parts of titanium dioxides and 20 parts of deionized waters.
In the present embodiment, inorganic binder component resists including 20 parts of polyvinyl acetate, 5 parts in parts by weight in step C
Split reinforcing fiber, 4 parts of water-soluble silicon fat liquor, 5 parts of palygorskite powder, 3 parts of sodium carbonate.
Embodiment 2
3D printing precoated sand moulding process includes the following steps in the present embodiment：
A, it is put into after roughing sand being rinsed 50min with clear water dry in 70 DEG C of thermostatic drying chamber；
B, the roughing sand after above-mentioned drying is immersed in progress pickling 30min processing in sulfuric acid solution, the roughing sand after pickling is used
Clear water is dried again after rinsing well, and pretreatment roughing sand is obtained after crossing 60 mesh sieve；
C, it is 300 DEG C, in the sand mixer that rotating speed is 500 revs/min by above-mentioned pretreatment roughing sand addition temperature, and mixing is added
Mulling 20min after the calcium stearate of chiltern amount 7%, then by sand mixer slow cooling to addition mixed sand quality after 140 DEG C
10% curing agent continues to stand 40min after stirring 10min；By sand mixer slow cooling to 100 DEG C after standing, mixing is added
The inorganic bond of chiltern amount 56%, the stir speed (S.S.) for adjusting sand mixer are 4000 revs/min, and mixed sand is obtained after stirring 30min；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 5min to be passed through the time, then stops 3min；Continue to be passed through 100 DEG C
Steam 3min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into the hot air drier that hot blast temperature is 150 DEG C and carry out hot air drying
Dry curing molding, heated-air drying 40min to get to molding 3D printing precoated sand.
In the present embodiment, curing agent component includes 20 parts of phenolic resin, 18 parts of polyvinyl alcohol contractings in parts by weight in step C
Butyraldehyde, 12 parts of polyvinyl alcohol, 10 parts of water-soluble silicon oils, 15 parts of paraffin oils, 8 parts of triethanolamines, 20 parts of polyacrylamides, 8 portions of coconut palms
Oleyl amine, 12 parts of carboxymethyl celluloses, 12 parts of molybdenum disulfide, 10 parts of acroleic acid resin powder, 9 parts of titanium dioxides and 30 parts of deionizations
Water.
In the present embodiment, inorganic binder component resists including 40 parts of polyvinyl acetate, 15 parts in parts by weight in step D
Split reinforcing fiber, 12 parts of water-soluble silicon fat liquor, 10 parts of palygorskite powder, 9 parts of sodium carbonate.
Embodiment 3
3D printing precoated sand moulding process includes the following steps in the present embodiment：
A, it is put into after roughing sand being rinsed 35min with clear water dry in 62 DEG C of thermostatic drying chamber；
B, the roughing sand after above-mentioned drying is immersed in progress pickling 30min processing in sulfuric acid solution, the roughing sand after pickling is used
Clear water is dried again after rinsing well, and pretreatment roughing sand is obtained after crossing 60 mesh sieve；
C, it is 180 DEG C, in the sand mixer that rotating speed is 350 revs/min by above-mentioned pretreatment roughing sand addition temperature, and mixing is added
Mulling 22min after the calcium stearate of chiltern amount 4%, then by sand mixer slow cooling to addition mixed sand quality 6% after 140 DEG C
Curing agent, continue stir 10min after stand 32min；By sand mixer slow cooling to 85 DEG C after standing, mixed sand quality is added
45% inorganic bond, the stir speed (S.S.) for adjusting sand mixer are 2500 revs/min, and mixed sand is obtained after stirring 15min；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 3.5min to be passed through the time, then stops 3min；Continue to be passed through 100
DEG C steam 2.2min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into the hot air drier that hot blast temperature is 135 DEG C and carry out hot air drying
Dry curing molding, heated-air drying 32min to get to molding 3D printing precoated sand.
In the present embodiment, curing agent component includes 12 parts of phenolic resin, 9 parts of polyvinyl alcohol contractings in parts by weight in step C
Butyraldehyde, 5 parts of polyvinyl alcohol, 6 parts of water-soluble silicon oils, 7 parts of paraffin oils, 4 parts of triethanolamines, 12 parts of polyacrylamides, 3 portions of cocounut oil
Amine, 6 parts of carboxymethyl celluloses, 7 parts of molybdenum disulfide, 5 parts of acroleic acid resin powder, 4 parts of titanium dioxides and 22 parts of deionized waters.
In the present embodiment, inorganic binder component resists including 25 parts of polyvinyl acetate, 6 parts in parts by weight in step D
Split reinforcing fiber, 6 parts of water-soluble silicon fat liquor, 6 parts of palygorskite powder, 4 parts of sodium carbonate.
Embodiment 4
3D printing precoated sand moulding process includes the following steps in the present embodiment：
A, it is put into after roughing sand being rinsed 45min with clear water dry in 68 DEG C of thermostatic drying chamber；
B, the roughing sand after above-mentioned drying is immersed in progress pickling 30min processing in sulfuric acid solution, the roughing sand after pickling is used
Clear water is dried again after rinsing well, and pretreatment roughing sand is obtained after crossing 60 mesh sieve；
C, it is 360 DEG C, in the sand mixer that rotating speed is 450 revs/min by above-mentioned pretreatment roughing sand addition temperature, and mixing is added
Mulling 28min after the calcium stearate of chiltern amount 6%, then by sand mixer slow cooling to addition mixed sand quality 9% after 140 DEG C
Curing agent, continue stir 10min after stand 38min；By sand mixer slow cooling to 95 DEG C after standing, mixed sand quality is added
50% inorganic bond, the stir speed (S.S.) for adjusting sand mixer are 3500 revs/min, and mixed sand is obtained after stirring 25min；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 4.5min to be passed through the time, then stops 3min；Continue to be passed through 100
DEG C steam 2.6min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into the hot air drier that hot blast temperature is 145 DEG C and carry out hot air drying
Dry curing molding, heated-air drying 38min to get to molding 3D printing precoated sand.
In the present embodiment, curing agent component includes 18 parts of phenolic resin, 16 parts of polyvinyl alcohol contractings in parts by weight in step C
Butyraldehyde, 11 parts of polyvinyl alcohol, 9 parts of water-soluble silicon oils, 13 parts of paraffin oils, 7 parts of triethanolamines, 18 parts of polyacrylamides, 7 portions of cocounut oil
Amine, 11 parts of carboxymethyl celluloses, 11 parts of molybdenum disulfide, 9 parts of acroleic acid resin powder, 8 parts of titanium dioxides and 28 parts of deionized waters.
In the present embodiment, inorganic binder component resists including 35 parts of polyvinyl acetate, 12 parts in parts by weight in step D
Split reinforcing fiber, 10 parts of water-soluble silicon fat liquor, 9 parts of palygorskite powder, 8 parts of sodium carbonate.
Embodiment 5
3D printing precoated sand moulding process includes the following steps in the present embodiment：
A, it is put into after roughing sand being rinsed 40min with clear water dry in 65 DEG C of thermostatic drying chamber；
B, the roughing sand after above-mentioned drying is immersed in progress pickling 30min processing in sulfuric acid solution, the roughing sand after pickling is used
Clear water is dried again after rinsing well, and pretreatment roughing sand is obtained after crossing 60 mesh sieve；
C, it is 220 DEG C, in the sand mixer that rotating speed is 400 revs/min by above-mentioned pretreatment roughing sand addition temperature, and mixing is added
Mulling 25min after the calcium stearate of chiltern amount 5%, then by sand mixer slow cooling to addition mixed sand quality 8% after 140 DEG C
Curing agent, continue stir 10min after stand 35min；By sand mixer slow cooling to 90 DEG C after standing, mixed sand quality is added
53% inorganic bond, the stir speed (S.S.) for adjusting sand mixer are 3000 revs/min, and mixed sand is obtained after stirring 20min；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 4min to be passed through the time, then stops 3min；Continue to be passed through 100 DEG C
Steam 2.5min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into the hot air drier that hot blast temperature is 140 DEG C and carry out hot air drying
Dry curing molding, heated-air drying 35min to get to molding 3D printing precoated sand.
In the present embodiment, curing agent component includes 16 parts of phenolic resin, 14 parts of polyvinyl alcohol contractings in parts by weight in step C
Butyraldehyde, 10 parts of polyvinyl alcohol, 7 parts of water-soluble silicon oils, 9 parts of paraffin oils, 7 parts of triethanolamines, 16 parts of polyacrylamides, 3 portions of cocounut oil
Amine, 10 parts of carboxymethyl celluloses, 6 parts of molybdenum disulfide, 8 parts of acroleic acid resin powder, 4 parts of titanium dioxides and 24 parts of deionized waters.
In the present embodiment, inorganic binder component resists including 30 parts of polyvinyl acetate, 10 parts in parts by weight in step D
Split reinforcing fiber, 8 parts of water-soluble silicon fat liquor, 8 parts of palygorskite powder, 6 parts of sodium carbonate.
Comparative example 1
A kind of 3D printing rapid shaping precoated sand preparation method has following processing step：
(1) nice foundry sand pre-processes：After nice foundry sand is washed with water, it is immersed in the cetyl that mass percentage concentration is 1%
In the aqueous solution of trimethyl amine bromide, 10 hours are placed at room temperature for, filters, is washed with water to neutrality, it is dry, obtain pretreatment mound
Sand；
(2) prepared by 3D printing rapid shaping precoated sand：It in blender, is added by mass percentage, pre-processes nice foundry sand
89%, thermoplastic polyimide 5%, phenolic resin 4%, bisphenol A-type dianhydride 1.0%, glycerol monostearate 1.0%, unlatching is stirred
Machine rotating speed is mixed at 120 revs/min, grinds 30min, the liquid-solid ratio of the amount and nice foundry sand that add acetone is 1mL:9g, unlatching are ground
Mill speed grinds 30min at 120 revs/min, dry, obtains 3D printing rapid shaping precoated sand.
The molding 3D printing precoated sand that embodiment 1-5 and comparative example 1 are prepared is as strength test sample, by country
Professional standard JB/T 8583-2008 make a service test respectively, obtain data such as following table：
By upper table analysis it is found that being molded the tension of 3D printing precoated sand at normal temperatures by what embodiment 1-5 was prepared
Intensity and bending strength are better than the 3D printing rapid shaping precoated sand being prepared in comparative example 1；Meanwhile prepared by embodiment 1-5
The rupture rate of obtained molding 3D printing precoated sand is significantly lower than the 3D printing rapid shaping precoated sand being prepared in comparative example 1
Rupture rate, and high temperature resistance is better than the 3D printing rapid shaping precoated sand being prepared in ratio 1.
3D printing precoated sand moulding process obtains through the invention precoated sand intensity is high, high temperature resistance is good, Neng Gouti
High 3D printing workpiece quality does not pollute environment, energy conservation and environmental protection.Wherein, the inorganic bond added in the present invention can
The adhesive force of precoated sand is significantly improved, while the high temperature resistance of precoated sand can also be improved；The curing agent added in the present invention
The adhesive strength that precoated sand can be improved improves the weatherabilities such as heat resistance, the resistance to ag(e)ing of precoated sand, extends precoated sand
Service life.The present invention can improve the uniformity of roughing sand overlay film, carry out heated-air drying later, make sand using steam step is led to
Type dry solidification is molded, and setting rate is fast, reduces the rupture rate of precoated sand.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (9)
1. a kind of 3D printing precoated sand moulding process, which is characterized in that include the following steps：
A, it is put into after rinsing roughing sand with clear water well in thermostatic drying chamber dry；
B, the roughing sand after drying is subjected to pickling processes, the roughing sand after pickling is dried again after being rinsed well with clear water, crosses 60
Pretreatment roughing sand is obtained after mesh sieve；
C, above-mentioned pretreatment roughing sand is added in the sand mixer that temperature is 150 DEG C -300 DEG C, and mulling after calcium stearate is added
20min-30min continues to stand 30min- after stirring 10min then by sand mixer slow cooling to curing agent is added after 140 DEG C
40min；By sand mixer slow cooling to 80 DEG C -100 DEG C after standing, inorganic bond is added, mixed sand is obtained after stirring；
D, above-mentioned mixed sand is injected by core shooter in mold；
E, 100 DEG C of steam are passed through into above-mentioned mold, it is 3min-5min to be passed through the time, then stops 3min；Continue to be passed through 100
DEG C steam 2min-3min；Obtain 3D printing precoated sand semi-finished product；
F, above-mentioned 3D printing precoated sand semi-finished product are put into hot air drier and carry out heated-air drying curing molding to get to molding
3D printing precoated sand.
2. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that clear water in the step A
Washing time is 30min-50min, and drying temperature is 60 DEG C -70 DEG C in thermostatic drying chamber.
3. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that pickling in the step B
Time is 26-34min.
4. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that be added in the step C
Calcium stearate amount be pre-process roughing sand quality 3%-7%；The amount of the curing agent of addition is pretreatment roughing sand quality
5%-10%；The amount of the inorganic binder of addition is to pre-process the 40%-56% of roughing sand quality.
5. a kind of 3D printing precoated sand moulding process according to claim 4, which is characterized in that the curing agent component is pressed
Parts by weight include 10-20 parts of phenolic resin, 8-18 parts of polyvinyl butyral, 4-12 parts of polyvinyl alcohol, water-soluble silicon oil 5-
10 parts, 3-8 parts of triethanolamine, 10-20 parts of polyacrylamide, 2-8 parts of coco amine, 5-15 parts of paraffin oil, carboxymethyl cellulose 4-
20-30 parts of 12 parts, 4-10 parts of acrylic resin powder, 3-9 parts of titanium dioxide, 6-12 parts of molybdenum disulfide and deionized water.
6. a kind of 3D printing precoated sand moulding process according to claim 4, which is characterized in that the inorganic binder group
Include point in parts by weight 20-40 parts of polyvinyl acetate, 5-15 parts of cracking resistance reinforcing fibers, 4-12 parts of water-soluble silicon fat liquor,
5-10 parts of palygorskite powder and 3-9 parts of sodium carbonate.
7. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that mulling in the step C
The rotating speed of machine is 300-500 revs/min.
8. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that be added in the step C
Stir speed (S.S.) is 2000-4000 revs/min after inorganic binder, mixing time 10min-30min.
9. a kind of 3D printing precoated sand moulding process according to claim 1, which is characterized in that hot wind in the step F
The temperature of drying box is 130 DEG C -150 DEG C, hot-wind-drying time 30min-40min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110523913A (en) * | 2019-08-31 | 2019-12-03 | 新疆泰格迪木国际贸易有限公司 | A kind of preparation method of high intensity 3D printing precoated sand |
| CN112872293A (en) * | 2020-12-30 | 2021-06-01 | 亚威机械制造(徐州)有限公司 | Precoated sand casting process for manufacturing deep hole shaft |
| CN114799037A (en) * | 2022-04-20 | 2022-07-29 | 北京仁创砂业铸造材料有限公司 | Anti-vein precoated sand and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110523913A (en) * | 2019-08-31 | 2019-12-03 | 新疆泰格迪木国际贸易有限公司 | A kind of preparation method of high intensity 3D printing precoated sand |
| CN112872293A (en) * | 2020-12-30 | 2021-06-01 | 亚威机械制造(徐州)有限公司 | Precoated sand casting process for manufacturing deep hole shaft |
| CN114799037A (en) * | 2022-04-20 | 2022-07-29 | 北京仁创砂业铸造材料有限公司 | Anti-vein precoated sand and preparation method thereof |
| CN114799037B (en) * | 2022-04-20 | 2024-03-26 | 北京仁创砂业铸造材料有限公司 | Vein-resistant precoated sand and preparation method thereof |
| CN117548622A (en) * | 2024-01-05 | 2024-02-13 | 中国机械总院集团沈阳铸造研究所有限公司 | Precoated sand for selective laser sintering and preparation method thereof |
| CN117548622B (en) * | 2024-01-05 | 2024-03-12 | 中国机械总院集团沈阳铸造研究所有限公司 | Precoated sand for selective laser sintering and preparation method thereof |
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| CN108296442B (en) | 2020-09-18 |
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