CN104785709A - Precoated sand for casting and preparation method thereof - Google Patents
Precoated sand for casting and preparation method thereof Download PDFInfo
- Publication number
- CN104785709A CN104785709A CN201510217592.7A CN201510217592A CN104785709A CN 104785709 A CN104785709 A CN 104785709A CN 201510217592 A CN201510217592 A CN 201510217592A CN 104785709 A CN104785709 A CN 104785709A
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- sand
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- bonding agent
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- roughing
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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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a precoated sand for casting, which comprises raw sand, an adhesive, a curing agent, a coupling agent and a plasticizer. The adhesive accounts for 2-3 wt% of raw sand, the curing agent accounts for 40-60 wt% of the adhesive, the coupling agent accounts for 0.5-0.8 wt% of the adhesive, the lubricant accounts for 40-60 wt% of the adhesive, the plasticizer accounts for 5-8 wt% of the adhesive, the raw sand comprises thermal reclaimed sand and ceramic foundry sand, and the ceramic foundry sand accounts for 30-100 wt% of the raw sand. The invention also discloses a preparation method of the precoated sand for casting. The precoated sand prepared according to the formula and preparation method has the characteristics of high strength, low gas yield and low expansion ratio, and can keep the shape. When being used for core shooting under preset conditions and used for pouring castings, the precoated sand can greatly lower the pore generation rate, ensures the structural stability of the sand mold (core) under the condition of casting, and can not easily deform, thereby ensuring the casting shape to satisfy the design requirement.
Description
Technical field
The invention belongs to casting technique material technology, particularly relate to and a kind ofly cast with precoated sand.
Background technology
Precoated sand is covered with molding sand or the core sand of one deck hard resin film on sand grain surface before referring to moulding.Have cold process and Re Fa two kinds of coating techniques: binding agent dissolves by cold process ethanol, and adds curing agent in mulling process, make the two be coated on sand grain surface, ethanol volatilizees, and obtains precoated sand; Hot method is preheating to uniform temperature sand, and binding agent makes its melting, stirs overlay film at sand grain surface, adds aqueous solution of curing agent and lubricant, cooling, broken, sieve to obtain precoated sand.For steel-casting, ironcasting.Because precoated sand has that intensity is high, gas forming amount is low, production casting dimension accuracy is high, any surface finish, is convenient to the advantages such as preservation, be widely used.
High strength precoated sand in the market generally adopts new silica sand or cures silica sand is roughing sand, have higher expansion rate, high temperature deformation is serious, can not ensure shape when casting after making complex-shaped core, cause the rear inner die cavity shutoff of casting, the defects such as internal chamber wall is thin.
Summary of the invention
The object of the invention is to:
A kind of high strength precoated sand and preparation method thereof is provided, yielding defect when existing precoated sand is cast can be overcome, make full use of the ground expansion rate of nice foundry sand and the feature of almost spherical, be aided with thermal reclamation silica sand, strengthen precoated sand intensity and reduce high-temperature expansion distortion, effectively solving the cavity shape change defect that film covered sand core high temperature deformation causes.
The object of the invention is realized by following technical proposals:
A kind of casting precoated sand, comprise roughing sand, bonding agent, curing agent, coupling agent and plasticizer, it is characterized in that, bonding agent is the 2%-3% of roughing sand weight, and curing agent is the 40%-60% of bonding agent weight, and coupling agent is the 0.5%-0.8% of bonding agent weight, lubricant is the 40%-60% of bonding agent weight, and plasticizer is the 5%-8% of bonding agent weight.
As preferably, described roughing sand comprises thermal reclamation sand and nice foundry sand, and nice foundry sand accounts for the 30%-100% of roughing sand gross weight.
As preferably, nice foundry sand accounts for roughing sand weight 30%, and thermal reclamation sand accounts for roughing sand weight 70%, bonding agent is 2% of roughing sand weight, and curing agent is 40% of bonding agent weight, and coupling agent is 0.5% of bonding agent weight, lubricant is 40% of bonding agent weight, and plasticizer is 5% of bonding agent weight.
As preferably, nice foundry sand accounts for roughing sand weight 100%, and thermal reclamation sand accounts for roughing sand weight 0%, bonding agent is 3% of roughing sand weight, and curing agent is 60% of bonding agent weight, and coupling agent is 0.8% of bonding agent weight, lubricant is 60% of bonding agent weight, and plasticizer is 8% of bonding agent weight.
As preferably, nice foundry sand accounts for roughing sand weight 50%, thermal reclamation sand accounts for roughing sand weight 50%, bonding agent is 2.5% of roughing sand weight, curing agent is 50% of bonding agent weight, coupling agent is 0.55% of bonding agent weight, and lubricant is 50% of bonding agent weight, and plasticizer is 6.5% of bonding agent weight.
Cast the preparation method with precoated sand, comprise the following steps:
A. puddle mixer start, roughing sand preheating;
B. the roughing sand after preheating is added puddle mixer;
C. bonding agent, coupling agent and plasticizer are added puddle mixer within 10-25 second;
D., while step c carries out, overlay film is started;
E. steps d sprays into curing agent after completing 40-85 second;
F. step e adds lubricant after completing 10-20 second
G., after step f completes, air-cooled 40-70 second, start to shake out
H. fragmentation, screening are carried out to precoated sand.
In such scheme, the bonding agent adopted is phenolic resins, and plasticizer is dibutyl ester, and curing agent is methenamine, and coupling agent is silane, and lubricant is calcium stearate.
Compared with prior art, the beneficial effect of this programme is embodied in the following aspects:
1. nice foundry sand content is high, and the advantage brought is: can utilize the advantage that the particle shape of nice foundry sand own is good to greatest extent, makes the intensity of precoated sand own be improved and not increase gas forming amount; The advantage that nice foundry sand high-temperature expansion rate is low can be utilized to greatest extent, the stability (geometry and size) of shape under the core high temperature of guarantee manufactured by precoated sand.
2. the advantage of nice foundry sand and thermal reclamation sand proportioning: this coated sand technology is mainly used in automobile engine cylinder-body (crankcase) and the cylinder cap that scale manufactures cast iron quality; rational nice foundry sand and thermal reclamation sand proportioning can ensure that batch obtains the automobile engine cylinder-body (crankcase) of qualified cast iron quality and cylinder cap and reduction nice foundry sand consumption to greatest extent; ensure economic benefit (nice foundry sand is artificial sand, and cost is far away higher than thermal reclamation sand).Under regular situation, if sand mold (core) degree of crook own is large, casting time be subject to molten iron effect (wash away, soak, toast) by force, the foundry goods spot size required precision high (tiny cylinder barrel wall, oil duct chamber wall, cylinder cap inner chamber etc.) that sand mold is formed, during casting, sand mold (core) distortion is serious, then nice foundry sand content needs height.
3. the selection of bonding agent, coupling agent, curing agent, additive, lubricant, and advantage place: the additional proportion of binding agent depends on shape and the force-bearing situation of target sand mold (core), general thicker is that the required binding agent of sand mold (core) is few, more tiny and shape bends and is subject to the strong sand mold of molten iron effect (core) in casting to be needed comparatively
Many binding agents, the selection of all the other compositions depends primarily on the additional proportion of binding agent.
The one casting precoated sand that this programme provides, there is the feature of high strength, low gas forming amount and low thermal expansion, shape can held, use this precoated sand core shooting casting for foundry goods under formulation condition, can significantly reduce pore production rate, and ensure sand mold (core) structural stability in casting situation, not yielding, thus ensure that cast shape meets designing requirement.
Detailed description of the invention
Following non-limiting examples is for illustration of the present invention.
Embodiment 1:
Thermal reclamation sand 40/70 order, nice foundry sand 50/30 order, nice foundry sand accounts for roughing sand weight 30%, thermal reclamation sand accounts for roughing sand weight 70%, bonding agent is 2% of roughing sand weight, and curing agent is 40% of bonding agent weight, and coupling agent is 0.5% of bonding agent weight, lubricant is 40% of bonding agent weight, and plasticizer is 5% of bonding agent weight.
Start → roughing sand adds calcium stearate → after air-cooled 60 seconds after being preheated to and spraying into curing agent → 35 second after 138 DEG C → puddle mixer adds hot sand → evenly add resin and dibutylester (completing for 40 seconds) → simultaneously start overlay film → 75 second, start to shake out → broken, sieve → carry out next circulation.
Embodiment 2:
Thermal reclamation sand 50/100 order, nice foundry sand 50/100 order, nice foundry sand accounts for roughing sand weight 100%, thermal reclamation sand accounts for roughing sand weight 0%, bonding agent is 3% of roughing sand weight, and curing agent is 60% of bonding agent weight, and coupling agent is 0.8% of bonding agent weight, lubricant is 60% of bonding agent weight, and plasticizer is 8% of bonding agent weight.
Start → roughing sand adds calcium stearate → after air-cooled 60 seconds after being preheated to and spraying into curing agent → 35 second after 148 DEG C → puddle mixer adds hot sand → evenly add resin and dibutylester and silane (completing for 40 seconds) → simultaneously start overlay film → 85 second, start to shake out → broken, sieve → carry out next circulation.
Embodiment 3:
Thermal reclamation sand 40/70 order, nice foundry sand 50/100 order, nice foundry sand accounts for roughing sand weight 50%, thermal reclamation sand accounts for roughing sand weight 50%, bonding agent is 2.5% of roughing sand weight, and curing agent is 50% of bonding agent weight, and coupling agent is 0.55% of bonding agent weight, lubricant is 50% of bonding agent weight, and plasticizer is 6.5% of bonding agent weight.
Start → roughing sand adds calcium stearate → after air-cooled 60 seconds after being preheated to and spraying into curing agent → 30 second after 143 DEG C → puddle mixer adds hot sand → evenly add resin and dibutylester and silane (completing for 40 seconds) → simultaneously start overlay film → 80 second, start to shake out → broken, sieve → carry out next circulation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a casting precoated sand, comprise roughing sand, bonding agent, curing agent, coupling agent and plasticizer, it is characterized in that, bonding agent is the 2%-3% of roughing sand weight, and curing agent is the 40%-60% of bonding agent weight, and coupling agent is the 0.5%-0.8% of bonding agent weight, lubricant is the 40%-60% of bonding agent weight, and plasticizer is the 5%-8% of bonding agent weight.
2. a kind of casting precoated sand as claimed in claim 1, it is characterized in that, described roughing sand comprises thermal reclamation sand and nice foundry sand, and nice foundry sand accounts for the 30%-100% of roughing sand gross weight.
3. a kind of casting precoated sand as claimed in claim 2, it is characterized in that, nice foundry sand accounts for roughing sand weight 30%, thermal reclamation sand accounts for roughing sand weight 70%, bonding agent is 2% of roughing sand weight, and curing agent is 40% of bonding agent weight, and coupling agent is 0.5% of bonding agent weight, lubricant is 40% of bonding agent weight, and plasticizer is 5% of bonding agent weight.
4. a kind of casting precoated sand as claimed in claim 2, it is characterized in that, nice foundry sand accounts for roughing sand weight 100%, bonding agent is 3% of roughing sand weight, curing agent is 60% of bonding agent weight, coupling agent is 0.8% of bonding agent weight, and lubricant is 60% of bonding agent weight, and plasticizer is 8% of bonding agent weight.
5. a kind of casting precoated sand as claimed in claim 2, it is characterized in that, nice foundry sand accounts for roughing sand weight 50%, thermal reclamation sand accounts for roughing sand weight 50%, bonding agent is 2.5% of roughing sand weight, and curing agent is 50% of bonding agent weight, and coupling agent is 0.55% of bonding agent weight, lubricant is 50% of bonding agent weight, and plasticizer is 6.5% of bonding agent weight.
6., as a kind of preparation method cast with precoated sand in claim 1-5 as described in any one, it is characterized in that, comprise the following steps:
A. puddle mixer start, roughing sand preheating;
B. puddle mixer is added by reaching the roughing sand after preheat temperature;
C. bonding agent, coupling agent and plasticizer are added puddle mixer within 10-25 second;
D., while step c carries out, overlay film is started;
E. steps d sprays into curing agent after completing 40-85 second;
F. step e adds lubricant after completing 10-20 second;
G., after step f completes, air-cooled 40-70 second, start to shake out;
H. fragmentation, screening are carried out to precoated sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510217592.7A CN104785709A (en) | 2015-04-30 | 2015-04-30 | Precoated sand for casting and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217592.7A CN104785709A (en) | 2015-04-30 | 2015-04-30 | Precoated sand for casting and preparation method thereof |
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| CN104785709A true CN104785709A (en) | 2015-07-22 |
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| CN201510217592.7A Pending CN104785709A (en) | 2015-04-30 | 2015-04-30 | Precoated sand for casting and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105618668A (en) * | 2015-12-30 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | High-strength foundry sand |
| CN105750476A (en) * | 2016-04-28 | 2016-07-13 | 庆铃汽车（集团）有限公司 | Anti-delamination special coated sand and preparation method thereof |
| CN106077498A (en) * | 2016-08-15 | 2016-11-09 | 合肥江淮铸造有限责任公司 | A kind of core manufacturing craft of diesel engine cylinder block |
| CN106807881A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Casting precoated sand and its manufacture method |
| CN107234209A (en) * | 2017-07-26 | 2017-10-10 | 成都桐林铸造实业有限公司 | A kind of precoated sand and preparation method thereof |
| CN107363216A (en) * | 2017-07-26 | 2017-11-21 | 成都桐林铸造实业有限公司 | A kind of precoated sand used in DK4 cylinder blanks jacket core and preparation method thereof |
| CN108746475A (en) * | 2018-08-08 | 2018-11-06 | 重庆长江造型材料（集团）股份有限公司 | A kind of coated sand and preparation method thereof |
| CN109550887A (en) * | 2019-01-21 | 2019-04-02 | 浙江英洛华装备制造有限公司 | Mound precoated sand casts production system |
| CN111136239A (en) * | 2019-12-30 | 2020-05-12 | 绵阳市川星锅厂 | Casting method of hot pot |
| CN111774526A (en) * | 2020-06-24 | 2020-10-16 | 临沂茂源新材料科技有限公司 | Precoated sand production method and production line |
| CN113145792A (en) * | 2021-04-29 | 2021-07-23 | 厦门金鑫晶造型材料有限公司 | Preparation process applied to environment-friendly precoated sand of hollow camshaft |
| CN114273604A (en) * | 2021-11-15 | 2022-04-05 | 天阳新材料科技有限公司 | Recycling method of precoated sand dust |
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| JPS62263843A (en) * | 1986-05-09 | 1987-11-16 | Hitachi Chem Co Ltd | Binder for shell mold |
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| CN103691877A (en) * | 2013-12-17 | 2014-04-02 | 重庆长江造型材料（集团）股份有限公司 | Resin precoated sand prepared from reclaimed sand |
| CN104148591A (en) * | 2014-08-29 | 2014-11-19 | 成都桐林铸造实业有限公司 | Core making process |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
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| JPS62263843A (en) * | 1986-05-09 | 1987-11-16 | Hitachi Chem Co Ltd | Binder for shell mold |
| CN1083752A (en) * | 1993-08-31 | 1994-03-16 | 秦升益 | A kind of compound technology for filming sand |
| WO1997031732A1 (en) * | 1996-02-29 | 1997-09-04 | Elf Atochem S.A. | Binder-coated sand for moulds |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105618668A (en) * | 2015-12-30 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | High-strength foundry sand |
| CN105750476B (en) * | 2016-04-28 | 2018-12-07 | 庆铃汽车（集团）有限公司 | A kind of extraordinary precoated sand of anti-aliquation and preparation method thereof |
| CN105750476A (en) * | 2016-04-28 | 2016-07-13 | 庆铃汽车（集团）有限公司 | Anti-delamination special coated sand and preparation method thereof |
| CN106077498A (en) * | 2016-08-15 | 2016-11-09 | 合肥江淮铸造有限责任公司 | A kind of core manufacturing craft of diesel engine cylinder block |
| CN106807881A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Casting precoated sand and its manufacture method |
| CN107234209A (en) * | 2017-07-26 | 2017-10-10 | 成都桐林铸造实业有限公司 | A kind of precoated sand and preparation method thereof |
| CN107363216A (en) * | 2017-07-26 | 2017-11-21 | 成都桐林铸造实业有限公司 | A kind of precoated sand used in DK4 cylinder blanks jacket core and preparation method thereof |
| CN108746475A (en) * | 2018-08-08 | 2018-11-06 | 重庆长江造型材料（集团）股份有限公司 | A kind of coated sand and preparation method thereof |
| CN109550887A (en) * | 2019-01-21 | 2019-04-02 | 浙江英洛华装备制造有限公司 | Mound precoated sand casts production system |
| CN111136239A (en) * | 2019-12-30 | 2020-05-12 | 绵阳市川星锅厂 | Casting method of hot pot |
| CN111774526A (en) * | 2020-06-24 | 2020-10-16 | 临沂茂源新材料科技有限公司 | Precoated sand production method and production line |
| CN113145792A (en) * | 2021-04-29 | 2021-07-23 | 厦门金鑫晶造型材料有限公司 | Preparation process applied to environment-friendly precoated sand of hollow camshaft |
| CN114273604A (en) * | 2021-11-15 | 2022-04-05 | 天阳新材料科技有限公司 | Recycling method of precoated sand dust |
| CN114273604B (en) * | 2021-11-15 | 2023-08-29 | 天阳新材料科技有限公司 | Method for recycling precoated sand dust |
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Application publication date: 20150722 |
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