CN104014740B - A kind of method improving microwave heating waterglass sand mold resistance to water soak - Google Patents
A kind of method improving microwave heating waterglass sand mold resistance to water soak Download PDFInfo
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- CN104014740B CN104014740B CN201410257453.2A CN201410257453A CN104014740B CN 104014740 B CN104014740 B CN 104014740B CN 201410257453 A CN201410257453 A CN 201410257453A CN 104014740 B CN104014740 B CN 104014740B
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Abstract
The present invention relates to a kind of method improving microwave heating waterglass sand mold resistance to water soak; include step of overall modelling, heating steps, overlay film step, demoulding step; its overlay film step has two kinds of embodiments; the first embodiment is that the foundry sands of mixing water glass is after step of overall modelling, heating steps, demoulding step; mould surface after heating is covered eva film, and eva film is formed protecting film by thermal softening and is close to mould surface；The second embodiment is first to be close to die surface to cover eva film, is then placed in modified water glass sand molding, then puts in microwave oven and harden；The EVA plastic foil of the inventive method can be heated during sodium silicate sand mould hardening and be close to mould surface, thus improve anti-wettability power, the inventive method solves the sucting wet problem during waterglass sand mold is deposited, simplify formative technology, enhancing the comprcssive strength of casting mold, after casting mold is deposited one week, intensity decrease rate is less than 10%.
Description
Technical field
The present invention relates to a kind of method improving microwave heating waterglass sand mold resistance to water soak, the invention belongs to
In casting field.
Background technology
Compared with casting with the loam mold being easily generated black pollution, dust pollutes, water virus has
There are good fluidity, easy consolidation, labor intensity low, easy and simple to handle, energy consumption is low, labor condition good, type
The advantages such as (core) dimensional accuracy is high, casting quality is good, casting defect is few；Be easily generated chemical contamination
Resin sand compare, have again low cost, the advantages such as production scene is nonpoisonous and tasteless, labor condition is good, because of
And water-glass sand is thought by brainstrust and is most possibly realized Green foundry.The major defect of water-glass sand is:
Old sand collapsibility is poor, peeling difficulty, and regenerating used reuse is poor.
Practice and research show, reduction waterglass addition, raising waterglass bonding efficiency are to overcome water
The most effectual way of glass sand disadvantages mentioned above.Organic Ester Hardening Water Glass Sand (waterglass addition
2.5～3.5%) old sand collapsibility and reuse reproducibility are better than CO2 hardened sodium silicate sand (water significantly
Glass level 6.0～8.0%), and when waterglass addition is less than 2.0%, its old sand collapsibility and returning
By reproducibility close to resin bonded sand.
Microwave heating hardened sodium silicate sand can give full play to the bonding efficiency of waterglass, has waterglass and adds
Enter amount low (less than 2.0%), intensity is high, firm time is short, handling good, old sand is defeated and dispersed and regeneration
A series of advantages such as reuse is excellent, cleaning production are it is considered to be 21 century most probable realizes Green foundry
Molding sand.
Microwave heating principle is the material molecule (hydrone etc. in casting mold (core)) with polarity, is handing over
Under the microwave electric field effect become, change with the change of electromagnetic field, owing to the vibration of molecule falls behind
In the change of electric field, so producing intermolecular frictional heating, the temperature of casting mold (core) is made to raise.With biography
The heating leading character is compared, and microwave heating can make the greater part of object be heated, and due to micro-
Wave energy penetrates the inside of molding sand, the most progressively heats, and beneficially moisture is from the inside of type (core)
Volatilize to external migration, thus the setting rate of water-glass sand is fast.
Along with the fast development of microwave equipment, the actual application of microwave heating water virus becomes can
Can, microwave heating water virus is currently in " in emerging stage ", and the most only a few countries is being followed the tracks of
This research.This technique can overcome common conductive formula heating water virus shortcoming, homogeneous heating,
Firing rate fast, handling good, the cost of raw material is low.Microwave heating water-glass sand remains waterglass
The advantage of sand, overcomes again the respective shortcoming of existing CO2 hardened sodium silicate sand and ester hardened sodium silicate sand,
It it is considered as the 4th generation water virus and the 21 century most probable molding sand method that realizes Green foundry.
In patent CN101391453A, the method proposing " secondary microwave hardening ", solve water
Glass sand microwave heating mould requires high problem.With this microwave current hardened sodium silicate sand commercial Application
Main bugbear be that the hygroscopicity of sand mold is strong.Do not do the microwave heating waterglass casting mold of protection process in phase
To humidity be 60～80% air in deposit 2 hours after, comprcssive strength decline 50%, casting mold is the most not
It is applicable to cast again；Depositing one day, it is zero that intensity then completely loses.
Summary of the invention
For the problem of above-mentioned existence, present invention aim at a kind of raising microwave heating waterglass sand mold
The method of resistance to water soak changes the shapes such as existing microwave heating water-glass sand hygroscopicity is strong, storage condition is harsh
Condition, the present invention uses the method at waterglass sand mold surface coating to strengthen anti-moisture absorption property.
The technical scheme is that
A kind of method improving microwave heating waterglass sand mold resistance to water soak, comprises the steps: moulding
Step: add the waterglass of 1.2%-2.1%, mix homogeneously in foundry sands, put in mould and make
Type；Heating steps: sand mold is put into together with mould and carries out heat hardening in microwave oven；Demoulding step:
When sand mold temperature reaches 100-120 DEG C, stop heating, slough mould；Overlay film step: after heating
Mould surface covers eva film, and eva film is formed protecting film by thermal softening and is close to mould surface.
Eva film thickness in described overlay film step is 0.8mm-1.4mm.
Described step of overall modelling adds in waterglass or roughing sand 1.0-5.0% microwave absorption.
Described microwave wave absorbing agent is micropowder shape or liquid nitride, carbide.
Described nitride uses silicon nitride, and described carbide uses carborundum.
A kind of method improving microwave heating waterglass sand mold resistance to water soak, comprises the steps: overlay film
Step: be close to die surface and cover eva film；Step of overall modelling: add 1.2% in foundry sands
-2.1% waterglass, mix homogeneously, add die modeling；Heating steps: sand mold is put into together with mould
Microwave oven carries out heat hardening, stops heating when sand mold temperature reaches 100-120 DEG C, make EVA
Thin film is formed protecting film by thermal softening and is close to mould surface；Demoulding step: sand mold and protecting film cooling thereof
After, the demoulding.
Eva film thickness in described overlay film step is 1.4mm-2.0mm.
Described step of overall modelling adds in roughing sand or waterglass 1.0-5.0% microwave absorption.
Described microwave wave absorbing agent is micropowder shape or liquid nitride, carbide.
Described nitride uses silicon nitride, and described carbide uses carborundum.
Present invention have the advantage that
The method technique improving microwave heating waterglass sand mold resistance to water soak of the present invention is simple, draw materials just
Profit, cost are relatively low；
Present invention waterglass based on controllable temperature sand mold EVA (ethylene-vinyl acetate copolymer,
Ethylene-vinyl acetate) film coating technique, hardening temperature is harder than conventional microwave due to the effect of wave absorbing agent
Change sand mold height 10-30 DEG C, the higher casting mold of intensity can be obtained；
The fine and close EVA covering material of mould surface of the present invention can not only effectively stop entering of moisture in air
Invade, after the EVA high-temperature shrinkage of complicated mould surface can also swollen sand grains compatible deformation micro-with inside and enter
One step improves the intensity of sand mold；The overlay film sand mold of microwave heating is the lowest to the requirement of storage environment, even if
It is to deposit in the air ambient that humidity is bigger one week, deposits intensity still close to just going out the strong of microwave oven
Degree, solves the problem that difficulty deposited by sand mold.
Detailed description of the invention
Below in conjunction with embodiment the present invention will be described describe in detail.
Specific embodiment 1:
(1) in roughing sand, add the modified water glass (modulus is 1.9) of 2.1%, wherein modifying water glass
Agent uses the Neon SiC powder microwave absorption (modified water glass) of 1.0～5.0%, and mixing is all
Even；
(2) casting mold of foundry goods simple for flat board, cylinder etc., uses above-mentioned water-glass sand in wooden model
Moulding, hardens in microwave oven, stops heat hardening when sand mold temperature reaches 100 DEG C, sloughs mould,
Immediately the eva film that thickness is 0.8mm being placed on mould surface, eva film at high temperature can soften
Then it is close to mould surface and forms protecting film；
(3) can obtain, after sand mold and protecting film cooling thereof, the casting mold that comprcssive strength is 2.80MPa, sand mold exists
Relative humidity be 80% air in deposit one week, comprcssive strength still has 2.60MPa.
The present embodiment 1 is mainly used in the simple casting mold of most of moulding, at water-glass sand microwave heating
After at once mould surface cover layer EVA plastic foil, eva film thickness range
For 0.8mm-1.4mm, the waste heat of sand mold is utilized to make EVA plastic foil be close to mould surface, finally
Improve the anti-wettability power of sand mold.
In the application of the embodiment of the present invention one, the general water glass adding 1.2%-2.1% in foundry sands
Glass, microwave wave absorbing agent can add to inside sodium silicate binder, i.e. modified water glass, or also may be used
To add in molding sand, i.e. modified roughing sand, moulding the most again.Ratio is added in waterglass or roughing sand
Example is the microwave absorption of 1.0-5.0%.In microwave oven in hardening process, when sand mold temperature reaches
Heat hardening is stopped when 100-120 DEG C.
Specific embodiment 2:
(1) in roughing sand, first put into the nano-silicon nitride powder microwave absorption of 0.2%～6.0%, then add
Enter the waterglass (modulus is 2.5) of 1.2%, mix homogeneously (modified roughing sand)；
(2), for the casting mold of the intricate castings such as motor housing, during moulding, existing is 1.8mm's by thickness
Eva film is close to wooden model and is placed, and places into above-mentioned modified water glass sand molding, then puts into microwave
Stove hardens, stops heating when sand mold temperature reaches 120 DEG C；
(3) eva film can soften under microwave action and is then close to mould surface and forms protecting film,
Can obtain, after sand mold and protecting film cooling thereof, the casting mold that comprcssive strength is 2.20MPa, sand mold is the wettest
Degree be 80% air in deposit one week, comprcssive strength still has 2.05MPa.
The present embodiment 2 is mainly used in the casting mold that moulding is complicated, is first close to mould before sodium silicate molding
Tool inwall places one layer of thicker EVA plastic foil, and eva film thickness range is 1.4mm-2.0mm,
It is then placed in sodium silicate molding, then puts into higher temperature hardening in microwave oven, general when sand mold temperature
Degree reaches to stop heating when 100-120 DEG C, and EVA plastic foil can be subject to during sodium silicate sand mould hardening
Heat and be close to mould surface.
In the application of the embodiment of the present invention two, the general water glass adding 1.2%-2.1% in foundry sands
Glass, microwave wave absorbing agent can add to inside sodium silicate binder, i.e. modified water glass, it is also possible to add
It is added in molding sand, i.e. modified roughing sand, moulding the most again.In waterglass or roughing sand, adding proportion is
The microwave absorption of 1.0-5.0%.
The present invention can improve the microwave wave absorbing agent of mold temperature by using, and makes the mould surface temperature can
Control, between its equalizing section is 80 DEG C-120 DEG C.Wave absorbing agent can be micropowder shape or liquid carbon
The carbide such as SiClx, silicon nitride or silicide.
Conventional microwave heat hardening water-glass sand, sand mold puts into microwave oven together with mould, therefore mould
Tool material requirements is high, it is desirable to material microwave penetrance little, heat-resist, intensity good, microwave-absorbing
Height, wearability are good.
Embodiment described above only have expressed the several embodiments of the present invention, its describe more concrete and
In detail, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that,
For the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to
Making some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, patent of the present invention
Protection domain should be as the criterion with claims.
Claims (8)
1. the method improving microwave heating waterglass sand mold resistance to water soak, it is characterised in that: include as follows
Step:
(1) step of overall modelling: add the waterglass of 1.2%-2.1%, mix homogeneously in foundry sands, put into
Moulding in mould；
(2) heating steps: sand mold is put into together with mould and carries out heat hardening in microwave oven；
(3) demoulding step: when sand mold temperature reaches 100-120 DEG C, stops heating, sloughs mould；
(4) overlay film step: by thin for the EVA that mould surface cladding thickness is 0.8mm-1.4mm after heating
Film, eva film is formed protecting film by thermal softening and is close to mould surface.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 1,
It is characterized in that: described step of overall modelling adds in waterglass or roughing sand 1.0-5.0% microwave absorption.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 2,
It is characterized in that: described microwave wave absorbing agent is micropowder shape or liquid nitride, carbide.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 3,
It is characterized in that: described nitride uses silicon nitride, described carbide uses carborundum.
5. the method improving microwave heating waterglass sand mold resistance to water soak, it is characterised in that: include as follows
Step:
(1) overlay film step: be close to the eva film that die surface cladding thickness is 1.4mm-2.0mm；
(2) step of overall modelling: add 1.2%-2.1% waterglass, mix homogeneously in foundry sands, add mould
Tool moulding；
(3) heating steps: sand mold is put into together with mould and carries out heat hardening in microwave oven, when sand mold temperature
Reach to stop heating when 100-120 DEG C, make eva film be formed protecting film by thermal softening and be close to mould surface；
(4) demoulding step: after sand mold and protecting film cooling thereof, the demoulding.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 5,
It is characterized in that: described step of overall modelling adds in roughing sand or waterglass 1.0-5.0% microwave absorption.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 6,
It is characterized in that: described microwave wave absorbing agent is micropowder shape or liquid nitride, carbide.
A kind of method improving microwave heating waterglass sand mold resistance to water soak the most according to claim 7,
It is characterized in that: described nitride uses silicon nitride, described carbide uses carborundum.
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| CN105502401B (en) * | 2015-12-20 | 2018-03-30 | 无锡市虎皇漆业有限公司 | A kind of preparation method of nanometer silicon carbide modified firming agent waterglass |
| DE102017217098B3 (en) * | 2016-12-06 | 2018-04-05 | Wolfram Bach | Method and mold or core tool for making molds or cores |
| CN113263134B (en) * | 2021-05-12 | 2022-12-06 | 沈阳工业大学 | Additive for core making of composite hardened sodium silicate sand and application thereof |
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| JPH0775758B2 (en) * | 1989-06-29 | 1995-08-16 | 株式会社小松製作所 | Mold making method using microwave heating |
| CN2664884Y (en) * | 2003-09-26 | 2004-12-22 | 金文宗 | Precoating plastic foil for paper and plastic composition |
| ATE395270T1 (en) * | 2004-11-18 | 2008-05-15 | Amcor Flexibles Europe As | PACKAGING WITH VENTILATION ZONE |
| CN101380812B (en) * | 2007-09-07 | 2011-09-28 | 深圳市群达行精密模具有限公司 | Molding and punching tool for producing thin-film sheet and manufacture method of thin-film sheet |
| CN100586684C (en) * | 2008-10-24 | 2010-02-03 | 华中科技大学 | Microwave heating method for water glass sand mold or sand core |
| CN101486068B (en) * | 2009-02-12 | 2014-12-17 | 上海市机械制造工艺研究所有限公司 | Alcohol group zircon powder coating for large casting |
| CN102991063B (en) * | 2012-12-24 | 2015-04-22 | 北京印刷学院 | Composite material of pulp molding product and plastic and preparation method thereof |
| 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 |
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