CN104690226A - Evanescent mould casting process having high size precision of casting - Google Patents
Evanescent mould casting process having high size precision of casting Download PDFInfo
- Publication number
- CN104690226A CN104690226A CN201310664380.4A CN201310664380A CN104690226A CN 104690226 A CN104690226 A CN 104690226A CN 201310664380 A CN201310664380 A CN 201310664380A CN 104690226 A CN104690226 A CN 104690226A
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- China
- Prior art keywords
- casting
- shell
- molten metal
- casting process
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
Abstract
The invention discloses an evanescent mould casting process having high size precision of a casting. The evanescent mould casting process comprises the following steps: preparing a foam model by adopting a foam material, coating a fireproof paint outside an evanescent mould, manufacturing a shell with a certain thickness by using a binder and sand, and hardening the shell; defoaming and reducing the volume to remove the foam model by adopting a heating method, so that manufacturing of the shell is completed, adding the foam model with the shell into a heating furnace, and defoaming and reducing the volume of the foam model when the temperature is increased to 360-400 DEG C by heating; putting the defoamed and volume-reduced shell on a centrifugal casting machine; and beginning to centrifuge the casting after pouring molten metal till the molten metal is solidified in the rotary process of the shell so as to form the casting. When the evanescent mould casting process disclosed by the invention is used for casting the evanescent mould, dry sand is unnecessary to fill; the casting deformation phenomena due to non-compact filling of the dry sand is avoided; the size precision of the casting is high; furthermore, by adopting the foam model to defoam and reduce the volume, gas generated by gasification is reduced; the carbon content on the surface of the casting is reduced; and thus, the casting is green and environment-friendly.
Description
Technical field
The present invention relates to a kind of lost foam casting process, be specifically related to the lost foam casting process that a kind of casting dimension accuracy is high.
Background technology
Lost foam casting (also known as cavityless casting) is with foamed plastics (EPS, STMMA or EPMMA) macromolecular material make become and the design of part that casting will be produced, the duplicate full mold mould of size, (strengthening is played through dip-coating fireproof coating, bright and clean, permeation functions) and after drying, be embedded in drystone sand through three-dimensional vibrating moulding, casting molding flask pours into molten metal liquid under negative pressure state, make macromolecular material model by thermal evaporation extraction, and then the disposal molding New Casting Technique formed after being replaced cooled and solidified by liquid metals produces the novel casting method of foundry goods.
In existing lost foam casting process, need to insert dry sand, to support the shape of evaporative pattern cast model when casting of molten metal, prevent distortion, but the method, often because unreal casting deformation, the dimensional accuracy of causing of dry sand filling is low.
Summary of the invention
The object of this invention is to provide the lost foam casting process that a kind of casting dimension accuracy is high.
To achieve these goals, the technical solution of employing is in the present invention:
The lost foam casting process that casting dimension accuracy is high, comprises the following steps:
(1) adopt expanded material preparation foaming model, at the outer coating refractory coating of evaporative pattern, and make certain thickness shell with binding agent and sand, treat that it hardens;
(2) adopt heating froth breaking capacity reducing to remove foaming model, complete shell and make, the foaming model with shell is added heating furnace, is heated to 360 ~ 400 degree and makes foaming model froth breaking capacity reducing;
(3) shell of froth breaking capacity reducing is placed on centrifugal casting machine;
(4) open centrifugal casting after casting of molten metal, molten metal is solidified under shell rotary course, form foundry goods.
Described binding agent is Ludox.
Described molten metal is operated by cup, and cup is fixed on shell by binding agent.
Compared with prior art, the beneficial effect that the present invention can produce: when the method for the invention carries out lost foam casting, need not insert dry sand, and avoid the generation that dry sand fills the unreal casting deformation phenomenon caused, the dimensional accuracy of product is high; And adopt foaming model froth breaking capacity reducing, reduce the gas that gasification produces, reduce the carbon content of cast(ing) surface, environmental protection.
Detailed description of the invention
The lost foam casting process that casting dimension accuracy is high, comprises the following steps:
(1) adopt expanded material preparation foaming model, at the outer coating refractory coating of evaporative pattern, and make certain thickness shell with binding agent and sand, treat that it hardens;
(2) adopt heating froth breaking capacity reducing to remove foaming model, complete shell and make, the foaming model with shell is added heating furnace, is heated to 360 ~ 400 degree and makes foaming model froth breaking capacity reducing;
(3) shell of froth breaking capacity reducing is placed on centrifugal casting machine;
(4) open centrifugal casting after casting of molten metal, molten metal is solidified under shell rotary course, form foundry goods.
Described binding agent is Ludox.
Described molten metal is operated by cup, and cup is fixed on shell by binding agent.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (3)
1. the lost foam casting process that casting dimension accuracy is high, is characterized in that, comprises the following steps:
(1) adopt expanded material preparation foaming model, at the outer coating refractory coating of evaporative pattern, and make certain thickness shell with binding agent and sand, treat that it hardens;
(2) adopt heating froth breaking capacity reducing to remove foaming model, complete shell and make, the foaming model with shell is added heating furnace, is heated to 360 ~ 400 degree and makes foaming model froth breaking capacity reducing;
(3) shell of froth breaking capacity reducing is placed on centrifugal casting machine;
(4) open centrifugal casting after casting of molten metal, molten metal is solidified under shell rotary course, form foundry goods.
2. the lost foam casting process that a kind of casting dimension accuracy is high according to claim 1, is characterized in that, described binding agent is Ludox.
3. the lost foam casting process that a kind of casting dimension accuracy is high according to claim 1, is characterized in that, described molten metal is operated by cup, and cup is fixed on shell by binding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664380.4A CN104690226A (en) | 2013-12-07 | 2013-12-07 | Evanescent mould casting process having high size precision of casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664380.4A CN104690226A (en) | 2013-12-07 | 2013-12-07 | Evanescent mould casting process having high size precision of casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104690226A true CN104690226A (en) | 2015-06-10 |
Family
ID=53337988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310664380.4A Pending CN104690226A (en) | 2013-12-07 | 2013-12-07 | Evanescent mould casting process having high size precision of casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104690226A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001480A (en) * | 2016-07-30 | 2016-10-12 | 安徽全柴天和机械有限公司 | Evaporative pattern centrifugal casting process |
| CN108296445A (en) * | 2018-03-08 | 2018-07-20 | 江苏飞鹿重工机械制造有限公司 | A kind of process for manufacturing cast article and casting die |
| CN114260423A (en) * | 2020-12-01 | 2022-04-01 | 安阳市凯创科技有限公司 | Casting heat section treatment method for medium and large precision castings |
| CN115945642A (en) * | 2023-01-04 | 2023-04-11 | 淄博水环真空泵厂有限公司 | EPS foaming mold casting process of dry screw vacuum pump rotor |
-
2013
- 2013-12-07 CN CN201310664380.4A patent/CN104690226A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001480A (en) * | 2016-07-30 | 2016-10-12 | 安徽全柴天和机械有限公司 | Evaporative pattern centrifugal casting process |
| CN108296445A (en) * | 2018-03-08 | 2018-07-20 | 江苏飞鹿重工机械制造有限公司 | A kind of process for manufacturing cast article and casting die |
| CN114260423A (en) * | 2020-12-01 | 2022-04-01 | 安阳市凯创科技有限公司 | Casting heat section treatment method for medium and large precision castings |
| CN115945642A (en) * | 2023-01-04 | 2023-04-11 | 淄博水环真空泵厂有限公司 | EPS foaming mold casting process of dry screw vacuum pump rotor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150610 |