CN101786141A - Method for eliminating carbon defects of lost foam casting products - Google Patents
Method for eliminating carbon defects of lost foam casting products Download PDFInfo
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- CN101786141A CN101786141A CN201010033303A CN201010033303A CN101786141A CN 101786141 A CN101786141 A CN 101786141A CN 201010033303 A CN201010033303 A CN 201010033303A CN 201010033303 A CN201010033303 A CN 201010033303A CN 101786141 A CN101786141 A CN 101786141A
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Abstract
The invention discloses a method for eliminating carbon defects of lost foam casting products, which includes manufacturing of foam models, brushing of coating, drying, modeling in a casting box, vacuum pumping and casting under negative pressure in the process of casting by adopting vacuum lost foam. Burning foam models are added in the process of vacuum pumping before the procedure of casting under negative pressure so that casting cavities are formed in the previous space of foam models after the foam models are burned up, and then casting is carried out under vacuum conditions; burning ports of burning models and slag bags of burning residues are remained on the foam models, and the thickness of the coatings on the models is more than 2 mm. The invention can eliminate carbon defects of casting pieces, such as carbonization or carbon distribution, and the like caused by lost foam gasification in the process of lost foam casting thoroughly.
Description
Technical field
The present invention relates to prevent in a kind of casting process that foundry goods from producing the method for carbon defects, refer in particular to a kind of method that mine flight conveyer block cast intermediate channel adopts product carburetting in the lost foam casting process or carbon distribution problem that solves.
Background technology
Our company is production mine equipment mainly, and mine flight conveyer block cast intermediate channel is exactly one of product of our company.Intermediate channel is a critical piece of carrying in the mine in the equipment of materials such as mineral aggregate, coal, and there is friction in it in that the convey materials process is medium-term and long-term, is easy to damage; The intermediate channel that the past people use steel plate to be welded always, because the restriction of factors such as steel plate welding performance, the wearability of intermediate channel is very poor, service life is very short.People attempt to adopt the method production intermediate channel of casting always, improve anti-wear performance and other comprehensive mechanical performance of intermediate channel to utilize casting that high-strength wear-resistant alloy can be used, but because the structure of intermediate channel is too complicated, the difficulty that has a lot of process aspects in casting process is produced the cast-in-block intermediate channel with cast abrasion-resistant alloy and is failed to realize always.My company is by scientific research, and through pilot production repeatedly, front and back are invested 20,000,000 yuan altogether, have solved the many technology difficult problems with cast abrasion-resistant alloy production monoblock cast intermediate channel finally, have realized the batch process of monoblock cast intermediate channel.In the technological problems that solves, comprise that cast-in-block intermediate channel carbon content is defective and have a strong impact on the problem of foundry goods mechanical performance.During the intermediate channel monoblock cast, can only use lost-foam casting method, when adopting lost foam casting process, the disappearance mould adopts expandable polystyrene as model, contains a lot of carbons in the material of model.When lost-foam casting method is cast after moulding; be directly molten metal to be injected the disappearance mould by cast gate on the disappearance mould and running channel; fusing burning and become gas under when casting disappearance mould can the effect at the molten metal of high temperature; contain a large amount of carbons in the gas that the mould that disappears this moment produces and enter in the alloy liquid of foundry goods, make inevitably to occur the carbon defects problem in the foundry goods body.Carbon defects in the foundry goods body comprises two kinds of carburetting defective and carbon distribution defectives.The general meeting of the carbon content that foundry goods increases behind the lost foam casting is between 0.05-0.1%, and skewness, is enough to the performance of the intermediate channel of shadow alloy cast steel material manufacturing like this, causes a large amount of waste products.Because the existence of a large amount of carbons, not only can cause foundry goods body carbon content to increase and the uneven defective of carbon content, when even more serious also the carbon distribution defective can appear, promptly form at the inner or shallow surface layer of foundry goods and pile up the carbon zone, the carbon distribution defective mainly is to be caused by the residue after the burning of the polystyrene in the model; The appearance of carbon distribution defective does not generally have fixing rule and occurrence positions, is difficult to take precautions against, and the carbon distribution defective can have a strong impact on the foundry goods bulk properties, can only do waste disposal sometimes.The existence of carbon defects is a bottleneck that adopts in the lost-foam casting method, is difficult to have breakthrough.
Chinese patent literature CN02118011.3 discloses a kind of New-type expandable copolymer resin and preparation method for this reason, with expandable copolymer resin manufacturing disappearance cast material, in material, add the StMMA copolymer resins, in the StMMA molecule oxygen atom is arranged, at high temperature, oxygen atom combines the formation CO gas and overflows with carbon atom C.Utilize oxygen atom to consume carbon atom, reduce the possibility that carbon residue produces.The carbon defects problem that occurs when solving in EPC technology with EPS model casting black metal, steel casting " carburetting " problem that solution EPS cast material causes.Though the carbon that this method produces when making the burning of disappearance mold materials does not exist in the form with simple substance carbon, and exist with the form of CO, but can not guarantee that C, CO or other material do not assemble in the molten metal of foundry goods, form carburetting, carbon deposit, pore or other defective.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of lost foam casting casting cycle medium casting alloy that can prevent and produce the method for carbon defects, thoroughly solve carbon defects problems such as carburetting that lost foam casting casting cycle medium casting alloy causes because of the gasification of disappearance mould or carbon distribution.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Prevent the method for the carbon defects of lost foam casting product, comprise the manufacturing bubbles model, the swabbing that adopt in the vacuum foam lost foam casting process, dry, bury the case moulding, vacuumize, the operation of casting under the negative pressure, increase the operation of burning bubbles model in the process that before negative pressure casting operation, vacuumizes, bubbles model is burnt in the original space of bubbles model form casting mold cavity, under the state that vacuumizes, cast then.It technical process that comprises becomes: make under bubbles model-swabbing-dry-bury case moulding-vacuumize-combustion model (also vacuumizing simultaneously)-negative pressure and cast.
Further improvement of the present invention is: the burning mouth that leaves combustion model on the described bubbles model.
Further improvement of the present invention is: during the burning bubbles model, add oxygen enrichment thing and combustible in bubbles model, bubbles model is fully burnt.The most frequently used oxygen enrichment thing is an oxygen, and combustible is natural gas, acetylene gas etc.
Further improvement in the technical proposal of the present invention is: the time of combustion model is not more than 10 minutes, bubbles model is fully burnt get final product.
Further improvement of the present invention is: produce the accumulated slag bag that accumulates combustion residue in the model bottom during described manufacturing bubbles model; Water and cast out behind the foundry goods again the accumulated slag bag that chipping removes this bottom, do not make residue enter body.
Further improvement of the present invention is: the coating layer thickness on the model of swabbing operation evenly is applied as more than the 2mm.
Owing to adopted technique scheme, the obtained technological progress of the present invention is:
When the present invention utilizes products such as lost foam casting intermediate channel, before in model, injecting molten metal, make model completing combustion earlier, and the gas that contains a large amount of carbons that produces during with the bubbles model combustion gasification by pumped vacuum systems takes away, can fundamentally solve the carbon defects problem of foundry goods.
For the bubbles model burning is clean, on bubbles model, leave the burning mouth of combustion model, so that combustible and oxygen enrichment thing can enter the various piece of bubbles model smoothly, combustible generally uses natural gas in factory's reality, the oxygen enrichment thing generally all is an oxygen, and natural gas and oxygen enter in the bubbles model by burning mouth, cast gate, rising head, and bubbles model is fully burnt, can prevent that the residue of foam from sticking on the inwall of dope layer, to form the die cavity of clean casting usefulness.The combustion model time should be not more than 10 minutes in the general practical operation work, and model is deformed, and also can guarantee fully to burn the residue of bubbles model.If when making bubbles model, increase the accumulated slag bag again, the comburant of a part of bubbles model is flowed in the accumulated slag bag in the bottom of bubbles model; Water and cast out the accumulated slag bag that removes this bottom behind the foundry goods, do not make residue enter body.
Because what the present invention adopted is unconventional lost-foam casting method, when burning bubbles model, the inside of sandbox can form cavity, in order to prevent that sandbox from subsiding, before combustion model, reach process at combustion model, keep the vacuum of sandbox to be very important in the casting cycle always, simultaneously also should increase the thickness that is coated in the outer field coating of bubbles model, make the coating of bubbles model form a housing with enough support forces, the intensity of the mould form after guaranteeing to burn, model shell coating thickness should evenly distribute more than 2mm for this reason, just can guarantee not take place the crush accident.
Adopt method of the present invention that the carbon increment of foundry goods is reduced to below 0.02%, meet the carbon content area requirement of steel-casting fully, foundry goods the carbon distribution defective can not occur again yet.The whole carbon content of foundry goods is even like this, dense structure, and stable performance has improved the performance of foundry goods greatly, and casting quality is met the requirements fully.
The specific embodiment
The specific embodiment below in conjunction with the casting intermediate channel is described in further details the present invention:
One, makes bubbles model
Shape according to intermediate channel is made bubbles model (being white mould), except that cast gate, rising head correctly are set, an accumulated slag bag is set in the bottom of bubbles model also, is provided with one in place and burns mouth.
Two, swabbing
At the even brush coating in the outside of bubbles model, the coating layer thickness of coating will reach more than the 2.5mm.
Three, oven dry
With coated and dried, guarantee that coating is fully dry according to common process, do not ftracture.
Four, bury the case moulding
The bubbles model of above-mentioned processing is placed in the sandbox, buries case with molding sand according to the common process method, and vibration molding, make molding sand have certain degree of packing.
Five, vacuumize
On sandbox, connect vaccum-pumping equipment, sandbox is vacuumized, make the molding sand moulding in the sandbox.
Six, burning bubbles model
Bubbles model is lighted at cast gate, rising head, burning mouth place at bubbles model, and constantly aerating oxygen and natural gas in bubbles model, and bubbles model is fully burnt, in burning, and the dynamics that should strengthen vacuumizing; Should be not more than 10 minutes burning time, and guarantee that fully burning bubbles model is as the criterion.
Seven, cast under the negative pressure
Continue to vacuumize, remove the input of natural gas and oxygen, melted antifriction alloy liquid is poured in the die cavity.
Eight, moulding cleaning
After the casting solidification cooling, open sandbox, remove cast gate, rising head, burning mouth and accumulated slag bag, foundry goods is carried out sand removal handle, and then can put in storage through operations such as heat treatment, checks.
Claims (6)
1. prevent the method for the carbon defects of lost foam casting product, comprise the manufacturing bubbles model, the swabbing that adopt in the vacuum foam lost foam casting process, dry, bury the case moulding, vacuumize, the operation of casting under the negative pressure, it is characterized in that: the operation that increases the burning bubbles model in the process that before negative pressure casting operation, vacuumizes, bubbles model is burnt in the original space of bubbles model form casting mold cavity, under the state that vacuumizes, cast then.
2. the method that prevents the carbon defects of lost foam casting product according to claim 1 is characterized in that: the burning mouth that leaves combustion model on the described bubbles model.
3. according to claim 1 or the 2 described methods that prevent the carbon defects of lost foam casting product, it is characterized in that: during the burning bubbles model, in bubbles model, add oxygen enrichment thing and combustible, bubbles model is fully burnt.
4. the method that prevents the carbon defects of lost foam casting product according to claim 3 is characterized in that: the time of combustion model is not more than 10 minutes.
5. according to claim 1 or the 2 described methods that prevent the carbon defects of lost foam casting product, it is characterized in that: produce the accumulated slag bag that accumulates residue of combustion in the model bottom when making bubbles model.
6. the method that prevents the carbon defects of lost foam casting product according to claim 1 is characterized in that: the coating on the model of swabbing operation evenly is applied as more than the 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010033303A CN101786141A (en) | 2010-01-05 | 2010-01-05 | Method for eliminating carbon defects of lost foam casting products |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010033303A CN101786141A (en) | 2010-01-05 | 2010-01-05 | Method for eliminating carbon defects of lost foam casting products |
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| CN101786141A true CN101786141A (en) | 2010-07-28 |
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| CN201010033303A Pending CN101786141A (en) | 2010-01-05 | 2010-01-05 | Method for eliminating carbon defects of lost foam casting products |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102366821A (en) * | 2011-10-24 | 2012-03-07 | 大连交通大学 | Green lost foam casting technology |
| CN102389941A (en) * | 2011-11-08 | 2012-03-28 | 郭雷辰 | Foam plastics mould preventing carbon defect of lost foam casting and preparation method thereof |
| CN102744390A (en) * | 2012-07-27 | 2012-10-24 | 湖南三星机床工具有限公司 | Vacuum lost foam casting process |
| CN104070132A (en) * | 2013-03-26 | 2014-10-01 | 通用电气公司 | Foam pattern coated with castable refractory and used for casting evanescent mode as well as production and application methods thereof |
| CN104874731A (en) * | 2014-02-28 | 2015-09-02 | 天津威尔朗科技有限公司 | Method for casting large-scale bucket tooth casting by using lost foam |
| CN104985121A (en) * | 2015-06-23 | 2015-10-21 | 吉林省威创机电工程有限公司 | Casting method of vehicle medium-and-large-sized stamping die |
| CN105344939A (en) * | 2015-12-02 | 2016-02-24 | 宁夏苏宁新能源设备有限公司 | Vacant-shell vacuum negative-pressure vibrating casting method for integrally casting middle trough |
| CN105458176A (en) * | 2015-12-10 | 2016-04-06 | 桂林中铸机械科技有限公司 | Carbon-free expendable pattern casting method for sodium silicate-bonded sand compounded dry sand moulding cavity |
| CN105566843A (en) * | 2016-02-01 | 2016-05-11 | 安徽埃斯克制泵有限公司 | Method for preparing foam plastic plate for evanescent mode manufacturing of pump body |
| CN107470561A (en) * | 2017-09-18 | 2017-12-15 | 邯郸慧桥复合材料科技有限公司 | A kind of white mould module combustion method of lost foam |
| CN110252948A (en) * | 2019-06-27 | 2019-09-20 | 共享装备股份有限公司 | A kind of evaporative pattern is first burnt pours casting method afterwards |
| CN111054892A (en) * | 2019-12-30 | 2020-04-24 | 山东常林铸业有限公司 | Method for solving casting slag hole by using foam slag collecting bag |
-
2010
- 2010-01-05 CN CN201010033303A patent/CN101786141A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102366821A (en) * | 2011-10-24 | 2012-03-07 | 大连交通大学 | Green lost foam casting technology |
| CN102389941A (en) * | 2011-11-08 | 2012-03-28 | 郭雷辰 | Foam plastics mould preventing carbon defect of lost foam casting and preparation method thereof |
| CN102389941B (en) * | 2011-11-08 | 2016-04-20 | 郭雷辰 | A kind of bubble mold sample preventing evaporative pattern foundry goods carbon defects and preparation method thereof |
| CN102744390B (en) * | 2012-07-27 | 2014-01-15 | 湖南三星机床工具有限公司 | Vacuum lost foam casting process |
| CN102744390A (en) * | 2012-07-27 | 2012-10-24 | 湖南三星机床工具有限公司 | Vacuum lost foam casting process |
| CN104070132A (en) * | 2013-03-26 | 2014-10-01 | 通用电气公司 | Foam pattern coated with castable refractory and used for casting evanescent mode as well as production and application methods thereof |
| CN104874731A (en) * | 2014-02-28 | 2015-09-02 | 天津威尔朗科技有限公司 | Method for casting large-scale bucket tooth casting by using lost foam |
| CN104985121A (en) * | 2015-06-23 | 2015-10-21 | 吉林省威创机电工程有限公司 | Casting method of vehicle medium-and-large-sized stamping die |
| CN105344939A (en) * | 2015-12-02 | 2016-02-24 | 宁夏苏宁新能源设备有限公司 | Vacant-shell vacuum negative-pressure vibrating casting method for integrally casting middle trough |
| CN105458176A (en) * | 2015-12-10 | 2016-04-06 | 桂林中铸机械科技有限公司 | Carbon-free expendable pattern casting method for sodium silicate-bonded sand compounded dry sand moulding cavity |
| CN105566843A (en) * | 2016-02-01 | 2016-05-11 | 安徽埃斯克制泵有限公司 | Method for preparing foam plastic plate for evanescent mode manufacturing of pump body |
| CN107470561A (en) * | 2017-09-18 | 2017-12-15 | 邯郸慧桥复合材料科技有限公司 | A kind of white mould module combustion method of lost foam |
| CN110252948A (en) * | 2019-06-27 | 2019-09-20 | 共享装备股份有限公司 | A kind of evaporative pattern is first burnt pours casting method afterwards |
| CN111054892A (en) * | 2019-12-30 | 2020-04-24 | 山东常林铸业有限公司 | Method for solving casting slag hole by using foam slag collecting bag |
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Open date: 20100728 |