CN110303117A - The application of the pretreating process of 3D printing silica sand, the silica sand of acquisition and silica sand - Google Patents
The application of the pretreating process of 3D printing silica sand, the silica sand of acquisition and silica sand Download PDFInfo
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- CN110303117A CN110303117A CN201910692465.0A CN201910692465A CN110303117A CN 110303117 A CN110303117 A CN 110303117A CN 201910692465 A CN201910692465 A CN 201910692465A CN 110303117 A CN110303117 A CN 110303117A
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- silica sand
- sand
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- mould
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses the applications of the pretreating process of 3D printing silica sand, the silica sand of acquisition and silica sand.Pretreating process includes: grinding, magnetic separation drying, roasting；Wherein, raw material silica sand is roasted into 2-3h at 900-950 DEG C when roasting, then cooled down.Roasting can remove silica sand surface impurity, obtain sand mould through 3D printing after mixing using this kind of silica sand with bonding agent, curing agent, the caking ability between bonding agent and silica sand in sand mould is higher, and the intensity of sand mould is higher；When obtaining equal strength sand mould, bonding agent additional amount can be reduced, thus gas forming amount when reducing sand mold die cast；The crystal transition of silica sand after roasting is α phosphorus quartz, reduces the swelling of silica sand at high temperature, thus reduces sand mould and occur the probability of vein, stomata in the case where casting high temperature.Silica sand is mixed with curing agent, is further continued for after being mixed with bonding agent, sand mould is made through 3D printing, wherein bonding agent accounts for the 3-5 ‰ of silica sand, and curing agent accounts for the 0.3-0.5% of silica sand.
Description
Technical field
The present invention relates to the technical fields of 3D printing material, the in particular to pretreating process of 3D printing silica sand, acquisition
Silica sand and silica sand application.
Background technique
Dioxide-containing silica is high in natural silica Sand, has the characteristics that heat-resist, grain shape is regular, is the weight of casting model powder pattern
Want material.Currently, using cold-box process in foundary industry, mix using resin as bonding agent with natural silica Sand, makees in curing agent
Casting mixture is set to harden to obtain solid cast sand mould under.Sand mould after solidification needs certain mechanical strength,
To guarantee that pattern is not damaged in carrying or casting process.
The method that sand mould improves intensity at present is mainly to increase the dosage of resin, however, type can be made by increasing amount of resin
The gas forming amount of mould increases, and influences surface quality of continuous castings and increases production cost.
Summary of the invention
In view of the shortcomings of the prior art, the purpose of the present invention one is: a kind of pretreating process of molding sand is provided, using this kind
Silica sand made from pretreating process makes sand mould, the additional amount of bonding agent can be reduced, to reduce gas forming amount, and can
Effectively mitigate sand mould and occurs the phenomenon that the defects of vein, stomata in casting process.
The first purpose of this invention has the technical scheme that
The pretreating process of 3D printing silica sand includes following preparation step:
Roasting: roasting 2-3h at 900-950 DEG C for raw material silica sand, then cool down, and obtains silica sand.
By using above scheme, raw material silica sand is carried out calcination process, the silicon that can be effectively removed after roasting by the present invention
Sand surface impurity.Sand mould, sand mold are obtained through 3D printing after being mixed in a certain ratio using this kind of silica sand and bonding agent, curing agent
The caking ability between bonding agent and silica sand in mould is higher, so as to effectively improve the intensity of sand mould.Due to sand mould
Intensity is improved with the increase of the additional amount of bonding agent, therefore uses silica sand of the invention, before obtaining equicohesive sand mould
It puts, the additional amount of bonding agent can be reduced, to reduce sand mould for gas forming amount when casting, improve piece surface matter
Amount.
Moreover, inventor is the study found that raw material silica sand is under above-mentioned roasting condition, crystal phase can change, and be changed into α
Phosphorus quartz, the swelling of the silica sand containing this kind of crystal phase at high temperature substantially reduce, thus greatly reduce sand mould and casting
The probability for occurring vein, stomata under high temperature is made, the surface quality of part can not only be improved, moreover, making the damage of sand mould
Rate is low, and service life extends.
The present invention is further arranged to: further include having following preparation step before firing:
Magnetic separation: magnetic separation is carried out to raw material silica sand.
By using above scheme, magnetic separation is to carry out magnet screening to raw material silica sand, can remove the oxygen in raw material silica sand
Change iron and, so as to improve the maturing temperature of silica sand, further increases silica sand table to improve the refractoriness and weld point of silica sand
The removal rate of face impurity, and can be improved the conversion ratio of α phosphorus quartz crystal, to further decrease silica sand in the case where casting high temperature
Swelling.
The present invention is further arranged to: drying and processing is carried out while magnetic separation.
By using above scheme, the moisture in raw material silica sand can be removed in advance, moisture dissipates in reduction roasting process
Hair amount, so that reducing moisture when roasting distributes adverse effect to silica sand particles.
The present invention is further arranged to: the drying temperature is 150-180 DEG C.
The present invention is further arranged to: further include having following preparation step before magnetic separation:
Grinding: raw material silica sand is ground to dihedral coefficient≤1.2.
By using above scheme, dihedral coefficient is the index for judging granule roundness, and dihedral coefficient is lower, rounding
It spends higher.In process of lapping, obtuse angle can be become by acute angle with angular particle in raw material silica sand, so that the angle of raw material silica sand
Shape coefficient reduces, and roundness improves, and the dihedral coefficient of the silica sand after the completion of handling is low.By the sand mold of this kind of silica sand printing and making
Mould, when the later period being used to make sand mould, under same resin amount, intensity is higher, that is, obtains the sand mould of same intensity
When, resin amount reduces, and can not only reduce cost, moreover it is possible to reduce gas forming amount when casting.
The present invention is further arranged to: the silicone content of the raw material silica sand is >=99%.
By using above scheme, the silicone content of raw material silica sand is limited, other low-melting-point materials in raw material silica sand can be limited
Content, impurity is low, is conducive to improve maturing temperature, so that the conversion ratio of α phosphorus quartz is higher, further mitigation silica sand is in the later period
Cast the swelling under high temperature.
The purpose of the present invention two: a kind of silica sand that above-mentioned pretreating process processing obtains is provided.
The purpose of the present invention three: a kind of application of above-mentioned silica sand is provided, for making 3D printing sand mould: by the silicon
It after sand is mixed with curing agent, is further continued for mixing with bonding agent, obtains 3D printing material, sand is made through 3D printing in 3D printing material
Pattern, wherein bonding agent accounts for 3% of silica sand or so, and curing agent accounts for the 0.3-0.5% of silica sand.
The present invention is further arranged to: the bonding agent selects resin.
The present invention is further arranged to: the curing agent selects sulfonic acid curing agent.
In conclusion the invention has the following advantages:
1, raw material silica sand is carried out calcination process by the present invention, the silica sand surface impurity after capable of effectively removing roasting.Using this kind
Silica sand makes sand mould, and the caking ability between bonding agent and silica sand in sand mould is higher, to improve the intensity of sand mould.By
It is improved in the intensity of sand mould with the increase of the additional amount of bonding agent, therefore uses silica sand of the invention, it is equicohesive obtaining
Under the premise of sand mould, the additional amount of bonding agent can be reduced, to reduce sand mould for gas forming amount when casting, improves zero
Part surface quality；
2, raw material silica sand is carried out calcination process by the present invention, and the crystal phase of raw material silica sand can change, and is changed into α phosphorus quartz, is contained
There is the swelling of the silica sand of this kind of crystal phase at high temperature to substantially reduce, thus greatly reduces sand mould and go out in the case where casting high temperature
The probability of existing vein, stomata, can not only improve the surface quality of part, moreover, making the spoilage of sand mould low, use the longevity
Life extends.
Specific embodiment
Invention is further described in detail below.
Embodiment 1
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 150 DEG C；
S3, roasting: roasting 3h for raw material silica sand at 900 DEG C, then furnace cooling, obtains silica sand.
Embodiment 2
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99.2%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 160 DEG C；
S3, roasting: roasting 2.5h for raw material silica sand at 910 DEG C, then furnace cooling, obtains silica sand.
Embodiment 3
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99.5%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 170 DEG C；
S3, roasting: roasting 2.5h for raw material silica sand at 920 DEG C, then furnace cooling, obtains silica sand.
Embodiment 4
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99.5%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 180 DEG C；
S3, roasting: roasting 2.5h for raw material silica sand at 930 DEG C, then furnace cooling, obtains silica sand.
Embodiment 5
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99.5%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 160 DEG C；
S3, roasting: roasting 2h for raw material silica sand at 940 DEG C, then furnace cooling, obtains silica sand.
Embodiment 6
A kind of 3D printing silica sand, pretreating process includes following steps:
S1, grinding: it is 1.2 that raw material silica sand, which is ground to dihedral coefficient, wherein the silicone content of raw material silica sand is 99.5%；
S2, magnetic separation and drying: carrying out magnetic separation to raw material silica sand, while carrying out drying and processing, and drying temperature is 160 DEG C；
S3, roasting: roasting 2h for raw material silica sand at 950 DEG C, then furnace cooling, obtains silica sand.
Embodiment 7
A kind of 3D printing silica sand, the difference with embodiment 6 are, in step S1, raw material silica sand, which is ground to dihedral coefficient, is
1.1。
Comparative example 1
A kind of 3D printing silica sand, the difference with embodiment 5 are, in step S1, raw material silica sand, which is ground to dihedral coefficient, is
1.3。
Comparative example 2
A kind of 3D printing silica sand, the difference with embodiment 5 are, in step S2, without magnetic separation.
Comparative example 3
A kind of 3D printing silica sand, the difference with embodiment 5 are, without the calcination process in step S3.
The test of sand mould strength character
10 kinds of silica sand samples made from embodiment 1-6 and comparative example 1-4 are respectively adopted, each silica sand sample is mixed with curing agent
It after conjunction, is further continued for mixing with bonding agent, obtains 3D printing material, sand mould is made through 3D printing in 3D printing material, it is total to obtain
10 parts of sand mould samples are obtained, the intensity of 10 parts of sand mould samples is tested, the intensity of every part of sample is surveyed 6 times, is averaged, as a result such as
Shown in table 1.Wherein, in this test, bonding agent and curing agent select furane resins and sulfonic acid curing agent respectively, and additional amount
Select as follows: furane resins account for the 3 ‰ of silica sand, and sulfonic acid curing agent accounts for the 0.3% of silica sand.
The strength test results of 1 sand mould sample of table
Subsequent sand mold can be effectively improved by carrying out calcination process to silica sand it can be seen from embodiment 5 and comparative example 3 in table 1
The intensity of mould, this is because calcination process can effectively remove roasting after silica sand surface impurity, using this kind of silica sand with it is Nian Jie
Agent, curing agent through 3D printing obtain sand mould after being mixed in a certain ratio, the bonding between bonding agent and silica sand in sand mould
Du Genggao, so as to effectively improve the intensity of sand mould.Due to sand mould intensity with bonding agent additional amount increase and
It improves, therefore the additional amount of bonding agent can be reduced under the premise of obtaining equicohesive sand mould using silica sand of the invention,
To reduce sand mould for gas forming amount when casting, surface quality of workpieces is improved.
Magnetic is carried out before carrying out calcination process to raw material silica sand it can be seen from embodiment 5 and comparative example 2 in table 1
Choosing, can effectively improve the intensity of subsequent sand mould.This may be because, if without magnetic separation, while again do not reduce roasting temperature
Degree, then the iron oxide in raw material silica sand is melted in the case where roasting high temperature, is influenced the configuration of surface of silica sand particles, is reduced silica sand
Cohesive force between particle surface and bonding agent, to reduce the intensity of sand mould.
The dihedral coefficient of raw material silica sand is equally to the strong of sand mould it can be seen from embodiment 5 and comparative example 1 in table 1
Degree tool has a certain impact, and dihedral coefficient is lower, and the intensity of corresponding sand mould is higher.This may be because of raw material silica sand
Dihedral coefficient is lower, and granule roundness is higher, can be improved the degree of packing arranged between particle, thus improves the intensity of sand mould.
Embodiment 1-6 in table 1 integrally it can be seen from the intensity of the sand mould of silica sand production that obtains of embodiment 1-6
It is whole higher, illustrate that design is scientific and reasonable for pretreating process of the invention, silica sand can be effectively improved, improves by its production
The intensity of sand mould.Moreover, the intensity of sand mould also shows the trend increased with the raising of maturing temperature, prompt
Within the scope of reasonable maturing temperature of the invention, maturing temperature is higher, and the pretreating effect of silica sand is more significant.
Sand mould casting test
10 parts of sand mould samples being respectively adopted in above-mentioned sand mould strength character test, which cast with batch, tests, and records sand
There is the case where vein, stomata in the case where casting high temperature in pattern, and the results are shown in Table 2.
2 sand mould casting test result of table
Embodiment 1-6 in table 2 integrally it can be seen from the sand mould of silica sand production that obtains of embodiment 1-6, by casting
Afterwards, inner wall surface does not occur vein, stomata, in contrast, difference occurs after the corresponding sand mould of comparative example 1-3 is cast
The vein or stomata of degree.This is because the crystal phase of raw material silica sand under the roasting condition can be sent out in pretreating process of the invention
Raw transformation, is changed into α phosphorus quartz, and the swelling of the silica sand containing this kind of crystal phase at high temperature is substantially reduced, thus dropped significantly
Low sand mould occurs the probability of vein, stomata in the case where casting high temperature.The surface quality of sand mould is high, can be improved the table of part
Face quality, moreover, the spoilage of sand mould is low, long service life.
There is vein and stomata in the corresponding sand mould of comparative example 2 in table 2, it may be possible to because, without magnetic separation, while again
Maturing temperature is not reduced, then the iron oxide in raw material silica sand is melted in the case where roasting high temperature, influences the surface shape of silica sand particles
State reduces the cohesive force between silica sand particles surface and bonding agent, to reduce the surface quality of sand mould.
There is vein in the corresponding sand mould of comparative example 1 in table 2, it may be possible to because the dihedral coefficient of raw material silica sand is higher,
Granule roundness is lower, and the degree of packing arranged between particle is low, to reduce the surface quality of sand mould.
Above-mentioned specific embodiment is only explanation of the invention, is not limitation of the present invention, art technology
Personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as
All by the protection of Patent Law in scope of the presently claimed invention.
Claims (10)
- The 1.3D printing pretreating process of silica sand, which is characterized in that include following preparation step:Roasting: roasting 2-3h at 900-950 DEG C for raw material silica sand, then cool down, and obtains silica sand.
- 2. the pretreating process of 3D printing silica sand according to claim 1, which is characterized in that before firing, also wrap Include following preparation step:Magnetic separation: magnetic separation is carried out to raw material silica sand.
- 3. the pretreating process of 3D printing silica sand according to claim 2, which is characterized in that in progress while magnetic separation Drying and processing.
- 4. the pretreating process of 3D printing silica sand according to claim 3, which is characterized in that the drying temperature is 150-180℃。
- 5. the pretreating process of 3D printing silica sand according to claim 2, which is characterized in that before magnetic separation, also wrap Include following preparation step:Grinding: raw material silica sand is ground to dihedral coefficient≤1.2.
- 6. the pretreating process of 3D printing silica sand according to claim 1, it is characterised in that: the silicon of the raw material silica sand Content is >=99%.
- 7. the 3D printing silica sand that a kind of any pretreating process processing of claim 1-6 obtains.
- 8. a kind of application of 3D printing silica sand as claimed in claim 7, which is characterized in that for making 3D printing sand mould: It after the silica sand is mixed with curing agent, is further continued for mixing with bonding agent, obtains 3D printing material, 3D printing material is beaten through 3D Print to obtain sand mould, wherein bonding agent accounts for 3% of silica sand or so, and curing agent accounts for the 0.3-0.5% of silica sand.
- 9. the application of 3D printing silica sand according to claim 8, it is characterised in that: the bonding agent selects furans tree Rouge.
- 10. the application of 3D printing silica sand according to claim 8, it is characterised in that: the curing agent selects sulfonic acid solid Agent.
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| CN201910692465.0A CN110303117A (en) | 2019-07-30 | 2019-07-30 | The application of the pretreating process of 3D printing silica sand, the silica sand of acquisition and silica sand |
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| CN201910692465.0A CN110303117A (en) | 2019-07-30 | 2019-07-30 | The application of the pretreating process of 3D printing silica sand, the silica sand of acquisition and silica sand |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586848A (en) * | 2019-10-22 | 2019-12-20 | 康硕(德阳)智能制造有限公司 | Sand mold material for 3D printing cast steel, preparation method thereof and method for manufacturing cast steel sand mold by using material |
| CN111375727A (en) * | 2020-04-22 | 2020-07-07 | 天津致勤新型材料有限公司 | 3D printing sand, high-temperature and cooling treatment process and application thereof |
| CN113091952A (en) * | 2021-04-12 | 2021-07-09 | 江苏徐工工程机械研究院有限公司 | 3D printing post-processing temperature measuring device and method |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114515816A (en) * | 2020-11-18 | 2022-05-20 | 沈阳铸造研究所有限公司 | Silica sand for 3D printing and preparation method and application thereof |
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| CN114515816A (en) * | 2020-11-18 | 2022-05-20 | 沈阳铸造研究所有限公司 | Silica sand for 3D printing and preparation method and application thereof |
| CN113091952A (en) * | 2021-04-12 | 2021-07-09 | 江苏徐工工程机械研究院有限公司 | 3D printing post-processing temperature measuring device and method |
| CN113091952B (en) * | 2021-04-12 | 2023-06-02 | 江苏徐工工程机械研究院有限公司 | 3D post-printing processing temperature measuring device and method |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114101577B (en) * | 2021-11-24 | 2023-12-29 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
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Application publication date: 20191008 |