CN108296476A - A kind of 3D printing coremaking precoated sand - Google Patents
A kind of 3D printing coremaking precoated sand Download PDFInfo
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- CN108296476A CN108296476A CN201710812570.4A CN201710812570A CN108296476A CN 108296476 A CN108296476 A CN 108296476A CN 201710812570 A CN201710812570 A CN 201710812570A CN 108296476 A CN108296476 A CN 108296476A
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- Prior art keywords
- sand
- printing
- coremaking
- precoated
- resin
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- 239000004576 sand Substances 0.000 title claims abstract description 208
- 238000010146 3D printing Methods 0.000 title claims abstract description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229920005989 resin Polymers 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 52
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229960004889 salicylic acid Drugs 0.000 claims abstract description 24
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims abstract description 23
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229960004011 methenamine Drugs 0.000 claims abstract description 23
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000008116 calcium stearate Substances 0.000 claims abstract description 22
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 238000010792 warming Methods 0.000 claims description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 8
- 239000001993 wax Substances 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- -1 polyethylene Polymers 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000007639 printing Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 238000012356 Product development Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
-
- 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
- B22C1/20—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 organic agents
- B22C1/22—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 organic agents of resins or rosins
- B22C1/2233—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 organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
-
- 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
-
- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to precoated sand field more particularly to a kind of 3D printing coremaking precoated sands.The precoated sand includes the raw material of following mass fraction：80% 90% nice foundry sand, 8% 18% iron sand, 1% 3% resin, 0.5% 1% salicylic acid account for the methenamine of weight resin 12% 18%, account for the calcium stearate of weight resin 4% 6%.Wherein the granularity of nice foundry sand is 50 100 μm, and the granularity of iron sand is less than 100 μm.Nice foundry sand does main roughing sand, reduces the dosage of binder, while the particle shape of nice foundry sand is preferable, the intensity of precoated sand has been effectively ensured；Make forming process heating rate fast using the superior thermal conductivity of iron sand, accelerates shaping speed；The addition of methenamine and resinoid bond, salicylic acid accelerator also further improves curing rate.The granularity of thinner nice foundry sand and iron sand considerably reduces the granularity of precoated sand finished product, to improve the accuracy of 3D printing, improves the surface quality of casting.
Description
Technical field
The present invention relates to precoated sand field more particularly to a kind of 3D printing coremaking precoated sands.
Background technology
3D printing is one kind of rapid shaping, is based on digital model file, with powdery metal, sand grains or modeling
The adhesive materials such as material construct the technology of object by layer-by-layer printing.Often in fields such as mold manufacturing, industrial designs
It is used for modeling.Conventional cast industry exploitation new product needs the processes such as mold, coremaking, group core, casting, time-consuming,
It is of high cost, efficiency is low；Novel 3D printing technique saves the processes such as mold, coremaking, substantially reduces the exploitation of new product
Period improves efficiency.3D printing is to use gravity superposition to make its curing molding by laser firing in layer precoated sand
Process, it is higher to precoated sand performance requirement, while cured speed has certain influence to the efficiency of 3D printing, therefore provide one
The 3D printing coremaking precoated sand that kind curing rate is fast, printing accuracy is high, printing effect is high is a technical problem of this field.
Invention content
The 3D printing coremaking that the object of the present invention is to provide a kind of curing rates soon, printing accuracy is high, printing effect is high
Precoated sand.
The technical solution adopted by the present invention is：
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：The nice foundry sand of 80%-90%, 8%-
18% iron sand, the resin of 1%-3%, the salicylic acid of 0.5%-1% account for the methenamine of weight resin 12%-18%, account for tree
The calcium stearate of fat weight 4%-6%.
Further, the granularity of nice foundry sand is 50-100 μm, and the granularity of iron sand is less than 100 μm.
Further, precoated sand includes the raw material of following mass fraction：The nice foundry sand of 80%-85%, the iron of 12%-17%
Sand, the resin of 2%-3%, the salicylic acid of 0.5%-0.8% account for the methenamine of weight resin 15%-18%, account for weight resin
The calcium stearate of 5%-6%.
Further, resin is using fast phenolic resin cured.
In the 3D printing coremaking precoated sand of the present invention, use nice foundry sand and iron sand for roughing sand, nice foundry sand sand grains is spherical shape, tool
There is preferable mobility, and surface is smooth, compact structure, ensures the intensity of precoated sand product；And because its surface area is small so that bond
Agent can uniform fold, and effectively reduce the addition of resin, to reduce casting flaw caused by binder, improve casting
The yield rate of part.Simultaneously as nice foundry sand heat conductivility is poor, pass through iron sand of the addition with superior thermal conductivity so that product
Heating rate is fast in forming process, and shaping speed can be improved.Nice foundry sand and iron sand selection grain size are smaller, to significantly drop
The low granularity of precoated sand finished product, improves the accuracy and surface quality of continuous castings of 3D printing；The granularity of iron sand wants small simultaneously
In the granularity of nice foundry sand, it is more advantageous to it and is evenly distributed on nice foundry sand surrounding and gos deep into gap, it is excellent that its can be given full play to
Thermal conductivity, heat-conducting effect are more preferable.Resinoid bond use is fast phenolic resin cured, is used cooperatively with curing agent methenamine, into
One step improves curing rate；Accelerating agent of the salicylic acid as resin solidification simultaneously also plays and accelerates precoated sand curing rate
Effect.
Further, which is prepared using following steps：(1) by dry nice foundry sand, iron sand and
Resin is poured into sand mixer by component ratio and is stirred simultaneously, and mixing speed is 60-100 revs/min；(2) mulling in whipping process
Machine carries out self-heating heating, after being heated to 35-40 DEG C, improves sand mixer rotating speed to 160-180 revs/min；(3) when sand mixer liter
Temperature is added methenamine by component ratio and salicylic acid carries out mixed grind to keeping the temperature after 100-120 DEG C, and adjust sand mixer rotating speed to
280-300 revs/min, calcium stearate is added by component ratio later and is mixed uniformly；(4) cooling screening, packaging.
Further, the heating rate of sand mixer is 3-5 DEG C/min.
Further, the time is blended as 2-4min after calcium stearate is added in step (3).
Further, sand mixer is preheated before stirring.
Further, sand mixer muller and scraper plate in whipping process is combined stirring.
In the preparation method of the 3D printing coremaking precoated sand of the present invention, each raw material component is sequentially added and is stirred continuously, adds
In the sand mixer of heat, under primary condition, sand mixer mixing speed is slower, and nice foundry sand and iron sand are uniformly mixed with resin, ensures tree
Fat binder is evenly distributed on around roughing sand；Sand mixer is heated up by self-heating mode in whipping process, when being heated to 35-40 DEG C
Resin starts to melt, and drives molten resin uniform adhesion around nice foundry sand and iron sand by improving sand mixer rotating speed；When
Resin fully melts after being warming up to 100-120 DEG C, and methenamine and salicylic acid is added, consolidates to precoated sand with resin-bonded
Change, while improving sand mixer rotating speed in the curing process and being stirred continuously, ensures the uniform of overlay film；Lubrication is added after solidification
Agent calcium stearate ensures that the precoated sand surface produced is smooth.In preparation process, each raw material sequentially adds in order, and not
With sand mixer rotating speed and at a temperature of stir, realize the uniform of mulling；Simultaneously in fast phenolic resin cured melting process not
Disconnected stirring, nice foundry sand ensure that the intensity of fine sand precoated sand by resinoid bond adhesive solidification.
The 3D printing coremaking precoated sand of the present invention, has the advantages that：
(1) in 3D printing coremaking precoated sand of the invention, nice foundry sand does main roughing sand, reduces the dosage of binder, together
When nice foundry sand particle shape it is preferable, the intensity of precoated sand has been effectively ensured；Make forming process liter using the superior thermal conductivity of iron sand
Warm speed is fast, accelerates shaping speed；The addition of methenamine and resinoid bond, salicylic acid accelerator also further improves
Curing rate.
(2) 3D printing coremaking precoated sand of the invention, the granularity of thinner nice foundry sand and iron sand, is greatly lowered in raw material
The granularity of precoated sand finished product to improve the accuracy of 3D printing improves the surface quality of casting.
(3) in the preparation method of 3D printing coremaking precoated sand of the invention, sand mixer can realize that self-heating, mulling stir it
Before can heat up in advance, improve preparation efficiency；Stirring is combined using muller and scraper plate in sand mixer simultaneously, is improved to mulling
The mixing effect of raw material in machine；Each raw material is added by pressing component ratio successively at different temperatures, solves fine sand overlay film not
Uniformly, intensity is low, produces the problems such as airborne dust.
(4) 3D printing coremaking precoated sand of the invention, room temperature tensile strength is close to 4MPa, with conventional 3D printing coremaking overlay film
Sand facies ratio, room temperature tensile strength does not have significant change, but curing rate improves 40%-60% relatively, so as to accelerate to produce
Product development cycle is shortened in product molding, improves the production efficiency of 3D printing product.
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
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：80% nice foundry sand, 18% iron sand,
1% resin, 0.5% salicylic acid account for the methenamine of weight resin 12%, account for the calcium stearate of weight resin 4%, also wrap
Include a small amount of polyethylene wax.Wherein, mound fineness of sand is 50-100 μm, and iron sand granularity is less than 100 μm.
3D printing coremaking precoated sand in the present embodiment is prepared using following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed is
60 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, and heating rate is 3 DEG C/min, after being heated to 35 DEG C, improves
Sand mixer rotating speed is to 160 revs/min；
(3) it is kept the temperature after sand mixer is warming up to 100 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 280 revs/min, calcium stearate is added by component ratio later and is uniformly blended 2min；
(4) cooling screening, packaging.
Embodiment 2
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：90% nice foundry sand, 8% iron sand,
1% resin, 0.8% salicylic acid account for the methenamine of weight resin 15%, account for the calcium stearate of weight resin 5%, also wrap
Include a small amount of polyethylene wax.Wherein, mound fineness of sand is 50-80 μm, and iron sand granularity is 60-100 μm.
3D printing coremaking precoated sand in the present embodiment is prepared using following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed is
100 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, and heating rate is 5 DEG C/min, after being heated to 40 DEG C, improves
Sand mixer rotating speed is to 180 revs/min；
(3) it is kept the temperature after sand mixer is warming up to 120 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 300 revs/min, calcium stearate is added by component ratio later and is uniformly blended 4min；
(4) cooling screening, packaging.
Embodiment 3
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：85% nice foundry sand, 12% iron sand,
2% resin, 0.6% salicylic acid account for the methenamine of weight resin 18%, account for the calcium stearate of weight resin 6%, also wrap
Include a small amount of polyethylene wax.Wherein, mound fineness of sand is 80-100 μm, 20-80 μm of iron sand granularity.
3D printing coremaking precoated sand in the present embodiment is prepared using following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed is
80 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, and heating rate is 4 DEG C/min, after being heated to 37 DEG C, improves
Sand mixer rotating speed is to 160 revs/min；
(3) it is kept the temperature after sand mixer is warming up to 110 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 280 revs/min, calcium stearate is added by component ratio later and is uniformly blended 3min；
(4) cooling screening, packaging.
Embodiment 4
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：80% nice foundry sand, 17% iron sand,
2% resin, 0.5% salicylic acid account for the methenamine of weight resin 12%, account for the calcium stearate of weight resin 6%, also wrap
Include a small amount of polyethylene wax.Wherein, mound fineness of sand is 60-100 μm, and iron sand granularity is less than 100 μm.
3D printing coremaking precoated sand in the present embodiment is prepared using following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed is
70 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, and heating rate is 5 DEG C/min, after being heated to 38 DEG C, improves
Sand mixer rotating speed is to 170 revs/min；
(3) it is kept the temperature after sand mixer is warming up to 112 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 290 revs/min, calcium stearate is added by component ratio later and is uniformly blended 2min；
(4) cooling screening, packaging.
Embodiment 5
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：82% nice foundry sand, 13% iron sand,
3% resin, 1% salicylic acid account for the methenamine of weight resin 16%, account for the calcium stearate of weight resin 5%, further include
A small amount of polyethylene wax.Wherein, mound fineness of sand is 50-90 μm, and iron sand granularity is less than 50 μm.
3D printing coremaking precoated sand in the present embodiment is prepared using following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed is
90 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, can be preheated from room temperature to sand mixer before stirring, rises
Warm speed is 3 DEG C/min, after being heated to 36 DEG C, improves sand mixer rotating speed to 180 revs/min；
(3) it is kept the temperature after sand mixer is warming up to 108 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 300 revs/min, calcium stearate is added by component ratio later and is uniformly blended 2min；
(4) cooling screening, packaging.
Comparative example 1
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：The Inner Mongol great Lin of 100-300 μm of 80%
Roughing sand, 2% resin, 0.5% salicylic acid account for the methenamine of weight resin 12%, account for the stearic acid of weight resin 4%
Calcium further includes a small amount of polyethylene wax.
3D printing coremaking precoated sand in this comparative example is made using the preparation process of embodiment 1.
Comparative example 2
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：80% nice foundry sand, 2% resin,
0.5% salicylic acid accounts for the methenamine of weight resin 12%, accounts for the calcium stearate of weight resin 4%, further includes a small amount of gather
Ethylene waxes.Wherein, mound fineness of sand is 50-100 μm.
3D printing coremaking precoated sand in this comparative example is made using the preparation process of embodiment 1.
Comparative example 3
A kind of 3D printing coremaking precoated sand, includes the raw material of following mass fraction：80% nice foundry sand, 17% iron sand,
2% resin, 0.5% salicylic acid account for the methenamine of weight resin 12%, account for the calcium stearate of weight resin 4%, also wrap
Include a small amount of polyethylene wax.Wherein, mound fineness of sand is 50-100 μm, 100-200 μm of iron sand granularity.
3D printing coremaking precoated sand in this comparative example is made using the preparation process of embodiment 1.
Its room temperature tensile strength and curing rate are detected respectively to precoated sand obtained in embodiment and comparative example, wherein：
" 8 " printed words block is made in precoated sand by 1, room temperature tensile strength in 235 DEG C of mold, surveys room temperature tensile strength；
2, curing rate is characterized with cured thickness, precoated sand is poured into 235 DEG C " 8 " character mould and is heated 1 minute, scraped
Uncured portion is gone, cured portion thickness is surveyed, thickness is bigger, indicates that curing rate is faster.
Testing result is shown in Table 1：
1 room temperature tensile strength of table and cured thickness testing result
| Group | Room temperature tensile strength (MPa) | Cured thickness (mm) |
| Embodiment 1 | 3.9 | 3.02 |
| Embodiment 2 | 3.9 | 3.07 |
| Embodiment 3 | 4.0 | 3.10 |
| Embodiment 4 | 3.9 | 3.12 |
| Embodiment 5 | 3.9 | 3.05 |
| Comparative example 1 | 4.0 | 2.55 |
| Comparative example 2 | 3.9 | 2.20 |
| Comparative example 3 | 4.0 | 2.64 |
As can be seen from Table 1, there is no significant change in the room temperature tensile strength of precoated sand and comparative example in each embodiment, this
Although using thinner nice foundry sand and iron sand in invention as roughing sand, since nice foundry sand particle shape is preferably and in preparation process
In realize effective bonding between raw material, reducing precoated sand product grading to realize to improve the accuracy of 3D printing
Under the premise of ensure that the intensity of precoated sand.Meanwhile by comparing each embodiment and the cured thickness in comparative example, find to use
Particulate nice foundry sand is roughing sand and coordinates more fine-grained iron sand, can give full play to the superior thermal conductivity of iron sand, improves solidification speed
Degree improves the production efficiency of 3D printing product to accelerate the molding of precoated sand product, shorten product development cycle.
The present invention is further described by specific embodiment above, it should be understood that, here specifically
Description, should not be construed as the restriction to the spirit and scope of the invention, and one of ordinary skilled in the art is reading this explanation
The various modifications made to above-described embodiment after book belong to the range that the present invention is protected.
Claims (9)
1. a kind of 3D printing coremaking precoated sand, which is characterized in that include the raw material of following mass fraction：The mound of 80%-90%
Sand, the iron sand of 8%-18%, the resin of 1%-3%, the salicylic acid of 0.5%-1% account for the Wu Luotuo of weight resin 12%-18%
Product account for the calcium stearate of weight resin 4%-6%.
2. 3D printing coremaking precoated sand according to claim 1, which is characterized in that the granularity of nice foundry sand is 50-100 μm,
The granularity of iron sand is less than 100 μm.
3. 3D printing coremaking precoated sand according to claim 1, which is characterized in that the precoated sand includes following quality point
Several raw materials：The nice foundry sand of 80%-85%, the iron sand of 12%-17%, the resin of 2%-3%, the salicylic acid of 0.5%-0.8%,
The methenamine for accounting for weight resin 15%-18% accounts for the calcium stearate of weight resin 5%-6%.
4. 3D printing coremaking precoated sand according to claim 1, which is characterized in that the resin uses fast cured phenolic tree
Fat.
5. 3D printing coremaking precoated sand according to claim 1, which is characterized in that the 3D printing coremaking precoated sand uses
It is prepared by following steps：
(1) dry nice foundry sand, iron sand and resin are poured into sand mixer simultaneously by component ratio and is stirred, mixing speed 60-
100 revs/min；
(2) sand mixer carries out self-heating heating in whipping process, after being heated to 35-40 DEG C, improves sand mixer rotating speed to 160-180
Rev/min；
(3) it is kept the temperature after sand mixer is warming up to 100-120 DEG C, methenamine is added by component ratio and salicylic acid carries out mixed grind,
And sand mixer rotating speed is adjusted to 280-300 revs/min, calcium stearate is added by component ratio later and is mixed uniformly；
(4) cooling screening, packaging.
6. 3D printing coremaking precoated sand according to claim 5, which is characterized in that the heating rate of the sand mixer is 3-
5℃/min。
7. 3D printing coremaking precoated sand according to claim 5, which is characterized in that after calcium stearate is added in step (3)
It is 2-4min to be blended the time.
8. 3D printing coremaking precoated sand according to claim 5, which is characterized in that the sand mixer carries out before stirring
Preheating.
9. 3D printing coremaking precoated sand according to claim 5, which is characterized in that the sand mixer is ground in whipping process
Wheel and scraper plate are combined stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109128011A (en) * | 2018-11-13 | 2019-01-04 | 西峡县西泵特种铸造有限公司 | A kind of heat-resisting steel spiral case dual channel sand core and preparation method thereof and localization method |
| CN109365739A (en) * | 2018-12-10 | 2019-02-22 | 科左后旗兴达砂业有限责任公司 | A kind of medium thickness stainless cast steel part precoated sand |
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| CN114769511A (en) * | 2022-04-13 | 2022-07-22 | 山东燕山精密机械有限公司 | Sand mould riser seat and application thereof |
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| CN114769511B (en) * | 2022-04-13 | 2024-11-05 | 山东燕山精密机械有限公司 | A sand mold riser seat and its application |
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