CN100586684C - Microwave heating method for water glass sand mold or sand core - Google Patents
Microwave heating method for water glass sand mold or sand core Download PDFInfo
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- CN100586684C CN100586684C CN200810197391A CN200810197391A CN100586684C CN 100586684 C CN100586684 C CN 100586684C CN 200810197391 A CN200810197391 A CN 200810197391A CN 200810197391 A CN200810197391 A CN 200810197391A CN 100586684 C CN100586684 C CN 100586684C
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Abstract
The invention provides a microwave hardening method of water glass sand mold or sand core, belonging to the sand mold hardening method in casting industry. The method solves the problems that the existing microwave heating hardened water glass sand has high requirement on the die material and the sand mold or the sand core is easy to absorb the moisture, and improves the efficiency of the microwave heating hardened water glass sand. The method comprises the steps as follows: a shaping and core preparing step, a heating step, a demoulding step and a secondary heating step. The method has simpleprocess, low cost and good manipulation, can use normal wood die and plastic die, greatly reduces the requirement of the microwave heating on the die material, reduces the adding quantity of the water glass in the casting of water glass sand mold, and greatly improves the collapsibility and reusing performance of the water glass old sand; after demoulding, continuous heating is beneficial for theabsorption of the sand mold or sand core on the microwave, the energy resource consumption is reduced, the hardening efficiency is improved; and pouring in time can reduce the staying time of the hardened sand mold or sand core under the environment humidity as much as possible, and the anti-moisture disposal on the surface of the sand mold can shield the water vapor in the environment.
Description
Technical field
The invention belongs to sand mold method for curing in the casting industry, be specifically related to the microwave heating method of a kind of waterglass sand mold or core.
Background technology
Green cleaner production is the development trend of 21 century foundary industry, and many experts both domestic and external think: water-glass sand is the most possible molding sand of realizing green Foundry Production.The key that realizes the green cleaning of water-glass sand Foundry Production is two hang-ups that thoroughly solve water-glass sand technology: collapsibility is poor, the regenerating used difficulty, and the most basic way is to reduce the addition of waterglass.At present, the hardening process of waterglass sand mold or core has: heat hardening water-glass sand, CO
2Air blowing petrifying water glass sand, powder curing agent automatic harding glass sand and liquid organic ester automatic harding glass sand etc.
Common heating petrifying water glass sand intensity height, 3%～4% waterglass addition can obtain enough intensity, but its productivity ratio is low, energy consumption is big, labour intensity is big, common conduction-type heating, type (core) top layer be heated earlier usually dehydration sclerosis, form duricrust, make hot-air be difficult for infitration type (core) inside, the inner steam of type (core) is difficult for diffusing out, so the inside of thick large-scale (core) baking is not saturating, and its top layer is subject to paint baking over.
CO
2Air blowing petrifying water glass sand is widely adopted in foundry industry, but the waterglass addition is more, is generally 6.0%～8.0%, and collapsibility is poor, the regenerating used difficulty; The hardening process less stable can make casting mold (core) produce " over-blowing " phenomenon, causes the decline of casting mold (core) intensity; Type (core) surface for heavy castings easily breaks up, and inside is difficult to firmly thoroughly, makes foundry goods form defective.Powder petrifying water glass sand is easy and simple to handle, cost is low, energy production dimensional accuracy height, the foundry goods that casting flaw is few, but the addition of Powdered curing agent (as: addition of ferrosilicon powder be waterglass addition 20%～30%) generally all bigger than normal, the addition of waterglass is also than higher, generally need 5%～6%, collapsibility is unlike CO
2Air blowing petrifying water glass sand is good, and the dust pollution aggravation.
The characteristics of liquid Organic Ester Hardening Water Glass Sand are similar to self-hardening resin sand, light water glass addition is 3%～4%, the modified water glass addition is 2.5%～3.5%, the bigger raising of the collapsibility of its old sand and recyclability, but be subjected to ambient humidity, Temperature Influence bigger, its handling is relatively poor, and the collapsibility after reclaimed sand recycles has degradating trend.
Heating using microwave has advantages such as firing rate is fast, evenly heating, efficient energy-saving, sanitation and hygiene.During heating using microwave water-glass sand, moisture volatilizees to external migration from the inside of type (core), so type (core) sand can fully dry by the fire, integral body obtains the oven dry sclerosis.Heating using microwave petrifying water glass sand can be given full play to the bonding potentiality of waterglass, and the addition of waterglass can reduce to 1.0%～2.5%, improves the collapsibility and the regeneration of water-glass sand greatly.But the difficult point of present common heating using microwave petrifying water glass sand is: mold materials requires hygroscopicity high, sclerosis back waterglass sand mold (core) big.Timber, plastics and metal all can not be used as mold materials, the easy temperature distortion of timber and plastics, and metal can microwave reflection.Sand mold after the sclerosis (core) was deposited in air ambient one day, and the intensity of waterglass sand mold (core) can be lost totally.
Summary of the invention
The present invention proposes the microwave heating method of a kind of waterglass sand mold or core, solves the problem of existing heating using microwave petrifying water glass sand to mold materials requirement height, sand mold or the easy moisture absorption of core, improves the efficient of heating using microwave petrifying water glass sand.
The microwave heating method of a kind of waterglass sand mold of the present invention or core comprises:
(1) molding and core making step: in the casting roughing sand, add 1.0%～2.5% waterglass, mix, adopt wooden model, plastics mould or lucite model type or coremaking;
(2) heating steps: sand mold or core are put into micro-wave oven together with mould heat, microwave power is 500W～20KW, 5 seconds～60 seconds heat time heating time, makes its compression strength greater than 15KPa;
(3) demoulding step: sand mold or core after will heating take out the demoulding from micro-wave oven together with mould;
(4) second heating step: the sand mold after the demoulding or core are put into micro-wave oven once more carry out post bake, microwave power is 500W～20KW, 20 seconds～600 seconds heat time heating time, make it to harden fully, sand mold after obtaining hardening or core, compression strength are directly used in cast greater than 0.7MPa.
Described microwave heating method is characterized in that:
Sand mold after the sclerosis that described second heating step obtains or core, when not being used to pour into a mould immediately, then wet process is prevented on its surface, puts into the dry environment stored for future use again.
Described microwave heating method is characterized in that:
Described casting roughing sand is the casting roughing sand of quartz sand or other low microwave absorptivity; Described waterglass is casting water glass or the modified water glass for casting that adds reinforcing agent, moisture retardant; Described micro-wave oven is family expenses or industrial micro-wave oven.
The mold materials of moulding of the present invention (coremaking) comprises the material of nonmetal low microwave absorptivities such as timber, plastics and lucite; Sand mold after the demoulding carries out after post bake hardens fully, if be not used for cast immediately, and is parked in humidity bigger following time of air ambient, need prevent wet process to the sand mold surface, as at sand mold surface brushing moisture-proof coating etc.
Characteristics of the present invention are following several respects:
(1) addition of heating using microwave petrifying water glass sand fresh water (FW) glass can be by CO
22.5%～4.0% of 6.0%～8.0% and liquid Self-hardening Sodium Silicate Sand Technology of air blowing petrifying water glass sand technology is reduced to 1.0%～2.5%, make waterglass sand mold (core) have the high-intensity while, collapsibility obtains very big improvement, has also improved the regeneration performance of old sand simultaneously.
The waterglass sand mold is with waterglass, curing agent and sand mixing, moulding or coremaking, sclerosis back cast fully, cooling back peeling, old sand reuse.For the quality that guarantees foundry goods, avoid occurring defective, sand mold or core will have enough intensity.The waterglass addition is big more, and sand mold or core normal temperature strength are high more, and high-temperature residual strength is big more, and collapsibility is poor more, and regeneration is difficult more.In the heating using microwave petrifying water glass sand technology, do not need curing agent, heating using microwave makes the waterglass sclerosis, the bonding potentiality of waterglass are than being brought into play more fully in other hardening process, therefore, under the prerequisite that guarantees sand mold or core normal temperature strength, the addition of waterglass can be by CO
22.5%～4.0% of 6.0%～8.0% and liquid Self-hardening Sodium Silicate Sand Technology of air blowing petrifying water glass sand technology is reduced to 1.0%～2.5%, improved the collapsibility and the regeneration of old sand greatly.
(2) the present invention greatly reduces the requirement of microwave heating water-glass sand technology to mold materials, uses common wooden model and plastics mould can make microwave heating water-glass sand.
Common heating using microwave petrifying water glass sand, sand mold or core will be put into micro-wave oven together with mould, so mold materials requires highly, require that the material microwave penetrability is good, the microwave absorbability is little, good heat resistance, intensity height, wearability be good.Timber, plastics and metal all can not be used as mold materials, the easy temperature distortion of timber and plastics, and metal can microwave reflection.The invention solves the problems referred to above, short time heating using microwave for the first time can be used common wooden model and mould of plastics, when greatly reducing heating using microwave to the requirement of mold materials; The heating of the demoulding for the second time helps the absorption to microwave of sand mold or core, reduces energy resource consumption, improves sclerosis efficient.
(3) the invention solves the big problem of microwave heating waterglass sand mold hygroscopicity.
Waterglass sand mold or core hygroscopicity after the common heating using microwave petrifying water glass sand sclerosis are very big.Sand mold after the sclerosis or core were deposited in air ambient 4 hours, and the intensity of waterglass sand mold or core reduces more than 30%; Deposited one day, the intensity of waterglass sand mold or core can be lost totally.The present invention has solved an above-mentioned difficult problem preferably.Waterglass sand mold or core after the sclerosis are poured into a mould immediately, reduce the waterglass sand mold or the time of staying of core under ambient humidity after hardening as far as possible; Waterglass sand mold after the sclerosis or core surface are prevented that wet process (as: brushing moisture-proof coating etc. on the sand mold surface) can shield the steam in the environment.
(4) microwave heating water-glass sand technological work environmental friendliness, setting rate is fast, and the energy utilization rate height helps realizing clean and effective, energy-conservation production.
Heating using microwave has advantages such as firing rate is fast, evenly heating, efficient energy-saving, sanitation and hygiene.During heating using microwave water-glass sand, moisture volatilizees to external migration from the inside of sand mold or core, so molding sand or core sand can fully dry by the fire, integral body obtains the oven dry sclerosis, can reach very high intensity in short time, and can be used for cast immediately, and improved efficient, saved the energy.
Technology of the present invention is simple, cost is low, handling good, can use common wooden model and mould of plastics, when greatly reducing heating using microwave to the requirement of mold materials; The addition of waterglass in the water-glass sand mold casting be can reduce, the collapsibility and the regeneration of used sodium silicate sand improved greatly; Continue heating after the demoulding and help sand mold or core, reduced energy resource consumption, improved sclerosis efficient the absorption of microwave; Instant cast can reduce the waterglass sand mold or the time of staying of core under ambient humidity after the sclerosis as far as possible; The sand mold surface is prevented that wet process (as: brushing moisture-proof coating etc. on the sand mold surface) can shield the steam in the environment.
Description of drawings
Fig. 1 is a technical process block diagram of the present invention.
The specific embodiment:
Embodiment 1:
(1) molding and core making step: the casting water glass of adding 1.5% in foundry quartz sand, mix, adopt wood pattern molding;
(2) heating steps: sand mold is put into the industrial micro-wave oven of 2KW together with mould heat, 20 seconds heat time heating times, its compression strength reaches 28KPa;
(3) demoulding step: the sand mold after will heating takes out from micro-wave oven together with mould, the demoulding;
(4) second heating step: the sand mold after the demoulding is put into the 2KW industrial microwave oven once more carry out post bake, make it to harden fully 120 seconds heat time heating times, the sand mold after obtaining hardening, compression strength is 2.35MPa, is directly used in cast.
Embodiment 2:
(1) molding and core making step: the modified water glass for casting of reinforcing agent that in foundry quartz sand, added 1.0% adding, mix, adopt the plastics molded core;
(2) heating steps: sand mold is put into the industrial micro-wave oven of 10KW together with mould heat, 5 seconds heat time heating times, its compression strength reaches 17KPa;
(3) demoulding step: the core after will heating takes out from micro-wave oven together with mould, the demoulding;
(4) second heating step: the sand mold after the demoulding is put into the 10KW industrial microwave oven once more carry out post bake, make it to harden fully 20 seconds heat time heating times, the core after obtaining hardening, compression strength is 0.75MPa, takes out the back and brush moisture-proof coating, stored for future use from micro-wave oven.
Embodiment 3:
(1) molding and core making step: the casting waterglass of adding 2.5% in casting limestone sand, mix, adopt lucite model type;
(2) heating steps: sand mold is put into the 500W household microwave oven together with mould heat, 60 seconds heat time heating times, its compression strength reaches 36KPa;
(3) demoulding step: the sand mold after will heating takes out from micro-wave oven together with mould, the demoulding;
(4) second heating step: the sand mold after the demoulding is put into the 500W household microwave oven once more carry out post bake, make it to harden fully 600 seconds heat time heating times, the sand mold after obtaining hardening, compression strength is 2.85MPa, is directly used in cast.
Embodiment 4:
(1) molding and core making step: the modified water glass for casting of reinforcing agent that in foundry quartz sand, added 2.0% adding, mix, adopt wood pattern molding;
(2) heating steps: sand mold is put into the industrial micro-wave oven of 20KW together with mould heat, 10 seconds heat time heating times, its compression strength reaches 63KPa;
(3) demoulding step: the sand mold after will heating takes out from micro-wave oven together with mould, the demoulding;
(4) second heating step: the sand mold after the demoulding is put into the industrial micro-wave oven of 20KW once more carry out post bake, make it to harden fully 30 seconds heat time heating times, the sand mold after obtaining hardening, compression strength is 2.20MPa, takes out the back and brush moisture-proof coating, stored for future use from micro-wave oven.
Claims (3)
1. the microwave heating method of waterglass sand mold or core comprises:
(1) molding and core making step: in the casting roughing sand, add 1.0%～2.5% waterglass, mix, adopt wooden model, plastics mould or lucite model type or coremaking;
(2) heating steps: sand mold or core are put into micro-wave oven together with mould heat, microwave power is 500W～20KW, 5 seconds～60 seconds heat time heating time, makes its compression strength greater than 15KPa;
(3) demoulding step: sand mold or core after will heating take out the demoulding from micro-wave oven together with mould;
(4) second heating step: the sand mold after the demoulding or core are put into micro-wave oven once more carry out post bake, microwave power is 500W～20KW, 20 seconds～600 seconds heat time heating time, make it to harden fully, sand mold after obtaining hardening or core, compression strength are directly used in cast greater than 0.7MPa.
2. microwave heating method as claimed in claim 1 is characterized in that:
Sand mold after the sclerosis that described second heating step obtains or core, when not being used to pour into a mould immediately, then wet process is prevented on its surface, puts into the dry environment stored for future use again.
3. microwave heating method as claimed in claim 1 or 2 is characterized in that:
Described casting roughing sand is the casting roughing sand of quartz sand or other low microwave absorptivity; Described waterglass is casting water glass or the modified water glass for casting that adds reinforcing agent, moisture retardant; Described micro-wave oven is family expenses or industrial micro-wave oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200810197391A CN100586684C (en) | 2008-10-24 | 2008-10-24 | Microwave heating method for water glass sand mold or sand core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810197391A CN100586684C (en) | 2008-10-24 | 2008-10-24 | Microwave heating method for water glass sand mold or sand core |
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| CN101391453A CN101391453A (en) | 2009-03-25 |
| CN100586684C true CN100586684C (en) | 2010-02-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927521B (en) * | 2009-06-22 | 2012-05-30 | 上海贝诺装饰新材料有限公司 | Far-infrared heating method for imitation marble |
| CN103341593A (en) * | 2013-06-20 | 2013-10-09 | 重庆长江造型材料（集团）股份有限公司 | Drying method for water-based binder wet mold core |
| CN103521709B (en) * | 2013-08-22 | 2015-12-02 | 内蒙古第一机械集团有限公司 | A kind of CO 2air hardening is from hard coupling Hardening Sodium Silicate sand core core-making method |
| CN104014740B (en) * | 2014-06-11 | 2016-08-31 | 武汉纺织大学 | A kind of method improving microwave heating waterglass sand mold resistance to water soak |
| CN104399877B (en) * | 2014-11-11 | 2016-12-07 | 天津众智科技有限公司 | A kind of method utilizing microwave highly efficient regeneration used sodium silicate sand |
| DE102015106126A1 (en) * | 2015-04-21 | 2016-10-27 | Nemak, S.A.B. De C.V. | Core box for the production of casting cores |
| CN106466706A (en) * | 2015-08-21 | 2017-03-01 | 林州重机铸锻有限公司 | No rising head no case takes off frame model and its application |
| WO2017152348A1 (en) * | 2016-03-07 | 2017-09-14 | 苏州明志科技有限公司 | Core making machine with integrated microwave curing function |
| CN106984771A (en) * | 2017-05-09 | 2017-07-28 | 大连理工大学 | A kind of method for the elevated temperature strength for improving 3D printing sand mold/core |
| CN112517841B (en) * | 2020-11-26 | 2022-06-03 | 浙江省机电设计研究院有限公司 | Microwave heating resin sand core forming device and method thereof |
| CN112792295A (en) * | 2020-12-19 | 2021-05-14 | 郑州煤机格林材料科技有限公司 | Casting molding process with low content of water glass |
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2008
- 2008-10-24 CN CN200810197391A patent/CN100586684C/en not_active Expired - Fee Related
Non-Patent Citations (2)
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| 微波硬化水玻璃砂的性能. 咎小磊，樊自田，王继娜，潘迪.铸造，第57卷第4期. 2008 |
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Application publication date: 20090325 Assignee: Hangzhou Steam Turbine Casting and Forging Co., Ltd. Assignor: Huazhong University of Science and Technology Contract record no.: 2010330000600 Denomination of invention: Microwave heating method for water glass sand mold or sand core Granted publication date: 20100203 License type: Exclusive License Record date: 20100422 |
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