CN104308086B - Large-sized hollow urea core for investment casting and manufacturing process of large-sized hollow urea core - Google Patents
Large-sized hollow urea core for investment casting and manufacturing process of large-sized hollow urea core Download PDFInfo
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- CN104308086B CN104308086B CN201410604082.0A CN201410604082A CN104308086B CN 104308086 B CN104308086 B CN 104308086B CN 201410604082 A CN201410604082 A CN 201410604082A CN 104308086 B CN104308086 B CN 104308086B
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- Prior art keywords
- urea
- urea core
- core
- shell mould
- carbamide
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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
- B22C9/10—Cores; Manufacture or installation of cores
-
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a large-sized hollow urea core for investment casting and a manufacturing process of the large-sized hollow urea core. The shape of the large-sized hollow urea changes with needs of each casting to form a hollow groove-shaped structure; the thickness of the wall is 2-10 cm. The large-sized hollow urea core has the benefits that 1) the process is simplified, 2) the production efficiency of the casting is improved, 3) the production cost of investment of large-sized equipment is reduced, and 4) the risk of uncertain factors of quality brought by complex processes is reduced.
Description
Technical field
The invention belongs to investment pattern precision casting field, more particularly, to a kind of for the large hollow urea core in investment pattern precision casting and its
Processing technology.
Background technology
Precision-investment casting in the sector application wide range such as Aeronautics and Astronautics, weapons, electronics, ship, also known as " losing wax casting
Make ", typically coat several layers of refractory material in wax pattern surface, after its dry through, molten the going of wax-pattern therein is made type
Shell, then through roasting, then poured into a mould, and obtaining a kind of method of foundry goods, the foundry goods due to obtaining has higher size
Precision and surface smoothness, therefore also known as " precision-investment casting "；The maximum advantage of model casting is precisely due to investment-casting has
Very high dimensional accuracy and surface smoothness, so machining operations can be reduced, simply require higher position on part
Stay a little allowance, or even some foundry goods only stay polishing, polishing surplus it is not necessary to machining can use；Thus may be used
See, machine tool and machining period can be saved in a large number using investment casting method, significantly save raw material metal.
In recent years, tubular cast particularly macrotype tubular foundry goods gets more and more, and casting difficulty is also increasing, in this feelings
Mostly wax-pattern compacting is carried out using solid urea core under condition, because tubular cast size is big, and then leads to the consumption of urea core greatly,
And urea core rate of cooling is slow in the case of being somebody's turn to do, low production efficiency, increase cost.
Content of the invention
For solving above-mentioned technical problem, the invention provides a kind of for the large hollow urea core in investment pattern precision casting and its
Processing technology, the large hollow urea core that this is used in investment pattern precision casting and its processing technology are passed through
The present invention is achieved by the following technical programs.
The present invention provide a kind of for the large hollow urea core in investment pattern precision casting, described large hollow urea core
Shape with each foundry goods need change, it is the groove-like structure of a hollow, and the thickness of its wall is 1～10cm, preferably 1～
5cm, more preferably 1～2cm.
The making raw material of described large hollow urea core be carbamide, and in carbamide add 0.1～4% boric acid and
0.01～1% ethyl silicate hydrolyzed solution, preferably 1～4% boric acid and 0.1～0.5% ethyl silicate hydrolyzed solution.
Present invention also offers a kind of processing technology for the large hollow urea core in investment pattern precision casting, below including
Step:
(1) the shell mould of the hollow structure of tubular cast is made of wax-pattern；
(2) it is heated to placed in the vessel for carbamide 130～140 DEG C and makes urea liquid, then by boric acid and ethyl silicate
Hydrolyzed solution adds in urea liquid；
(3) urea liquid is poured in shell mould, and with Glass rod stirring, treat to have condensed one layer on shell mould inner wall
During carbamide, remaining urea liquid is poured out；
(4) molding coring, revise urea core and urea core be dried.
Wherein in step (3), pour into after shell mould after carbamide, by the temperature control of shell mould below 35 DEG C,
It is preferably less than 30 DEG C.
The method of described control shell mould is to be flowed in the outer surface of shell mould using recirculated water, makes shell mould
It is maintained under determined temperature.
The beneficial effects of the present invention is: 1) technique simplifies；2) improve the production efficiency rate of foundry goods；3) reducing needs to put into
The production cost of main equipment；4) reduce the quality uncertain factor risk that complicated technology brings.
Brief description
Fig. 1 is the use schematic diagram of the present invention
In figure: 1- carbamide figure.
Specific embodiment
Technical scheme be described further below, but claimed scope be not limited to described.
The present invention provide a kind of for the large hollow urea core in investment pattern precision casting, described large hollow urea core
Shape with each foundry goods need change, it is the groove-like structure of a hollow, and the thickness of its wall is 1～10cm, preferably 1～
5cm, more preferably 1～2cm, and, keep it from deforming in the case of sufficiently thin in urea core wall to ensure or damage
Bad, simultaneously when needing dissolved urea core, dissolving is fast, is to add in carbamide in the making raw material of large hollow urea core
0.1～4% boric acid and 0.01～1% ethyl silicate hydrolyzed solution, preferably 1～4% boric acid and 0.1～0.5% ethyl silicate water
Solution liquid, increases the caking property between urea molecule.Because urea core is hollow, its thawing time then has solid about several little
When be reduced to and only need to 20～30 minutes, such as rest in water, or often water stirred, the most handy circulating water, not only make urine
Plain dissolution time is accelerated, and avoids wax-pattern making wax-pattern inwall saponification in the urea liquid of high concentration, impact foundry goods
Surface quality.
Present invention also offers a kind of processing technology for the large hollow urea core in investment pattern precision casting, below including
Step:
(1) make the shell mould of the hollow structure of tubular cast of wax-pattern, mould must be gone through before coremaking
Tool it is ensured that mould intact it is ensured that after mould can normally use, in die cavity；Inside brush parting agent, parting agent has to apply
Uniformly, parting agent adopts 100% transformer oil to brush；
(2) carbamide is placed in stainless-steel pan and is heated to 130～140 DEG C and makes urea liquid, must not heat up during heating
Hurry up, too high, with prevent release ammonia when urea solution splash, then will boric acid and ethyl silicate hydrolyzed solution addition carbamide molten
In liquid,
(3) urea liquid is poured in shell mould, by the temperature control of shell mould below 35 DEG C, preferably 30 DEG C
Hereinafter, and with Glass rod stir, when having condensed one layer of carbamide on shell mould inner wall, remaining urea liquid is poured out, described
Control shell mould method be using recirculated water shell mould outer surface flow, make shell mould be maintained at both constant temperatures
Under degree；
(4) molding coring, enters during molding and firmly uniformly, and will hit mould twice with wooden mallet, to prevent urea core from deforming, right
Carbamide on fractal area is cleared up, it is to avoid mold-locked.
(5) revise urea core, after molding, the burr in urea core, fleshiness, overlap and pore will be repaired, for table
Planar defect excessively it is impossible to the defect repaired, must not use, be scrapped；
(5) urea core is dried, the urea core trimming is placed on dry place and carries out natural air drying.
In the present invention, its feature has 3, as follows:
(1) urea core is designed to hollow, both saved produce urea core cost, decrease the molten of urea core simultaneously
The solution time, decrease production cost, increased work efficiency '
(2) improve on the raw material making urea core, in carbamide, add boric acid and ethyl silicate hydrolyzed solution, add
The effect of boric acid be to speed up urea core need dissolve when dissolution time, add ethyl silicate hydrolyzed solution effect be to increase carbamide
Caking property between granule, due to ethyl silicate hydrolyzed solution generally as binding agent using in formwork making, so urinating
The addition of plain core designs in the range of 0.01～1%, not only can guarantee that the caking property between urea granules, and can guarantee that
Urea core can soon dissolve in dissolving.
(3) in the manufacturing process of urea core, with the tap water of flowing in the flowing of shell mould outer surface it is ensured that shell mould
The temperature of mould can control in good scope it is ensured that the surface of the carbamide mould made is more smooth, smooth.
Our factory is " bend pipe " foundry goods (see Fig. 1) that certain company produces, and this foundry goods belongs to macrotype tubular foundry goods, and wherein center is
Urea core (1).Solid urea core coremaking is adopted, urea core consumption is big, and cool time is long, increased operating process before improving
Middle difficulty, low production efficiency.Hollowing technology is adopted, the consumption of urea core substantially reduces, and cool time is also reduced to former after improvement
1/7 coming, improves production efficiency well, reduces cost.
Claims (8)
1. a kind of for the large hollow urea core in investment pattern precision casting it is characterised in that: the shape of described large hollow urea core
Shape with each foundry goods need change, it is the groove-like structure of a hollow, and the thickness of its wall is 1～10cm；Described is large-scale
The making raw material of hollow urea core is carbamide, and adds 0.1～4% boric acid and 0.01～1% ethyl silicate water in carbamide
Solution liquid.
2. be used for as claimed in claim 1 large hollow urea core in investment pattern precision casting it is characterised in that: the thickness of described wall
Spend for 1～5cm.
3. be used for as claimed in claim 1 large hollow urea core in investment pattern precision casting it is characterised in that: the thickness of described wall
Spend for 1～2cm.
4. the large hollow urea core that is used for as claimed in claim 1 in investment pattern precision casting it is characterised in that: add in carbamide
1～4% boric acid and 0.1～0.5% ethyl silicate hydrolyzed solution.
5. the processing technology of the large hollow urea core being used for as claimed in claim 1 in investment pattern precision casting is it is characterised in that wrap
Include following steps:
(1) the shell mould of the hollow structure of tubular cast is made of wax-pattern；
(2) it is heated to placed in the vessel for carbamide 130～140 DEG C and makes urea liquid, then boric acid and ethyl silicate are hydrolyzed
Liquid adds in urea liquid；
(3) urea liquid is poured in shell mould, and with Glass rod stirring, treat one layer of carbamide has been condensed on shell mould inner wall
When, remaining urea liquid is poured out；
(4) molding coring, revise urea core and urea core be dried.
6. be used for as claimed in claim 5 the processing technology of large hollow urea core in investment pattern precision casting it is characterised in that:
In step (3), pour into after shell mould after carbamide, by the temperature control of shell mould below 35 DEG C.
7. be used for as claimed in claim 6 the processing technology of large hollow urea core in investment pattern precision casting it is characterised in that: institute
The method of the control shell mould stated is to be flowed in the outer surface of shell mould using recirculated water, so that shell mould is maintained at set
At a temperature of.
8. be used for as claimed in claim 6 the processing technology of large hollow urea core in investment pattern precision casting it is characterised in that: type
The temperature control of shell mould is below 30 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410604082.0A CN104308086B (en) | 2014-10-31 | 2014-10-31 | Large-sized hollow urea core for investment casting and manufacturing process of large-sized hollow urea core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410604082.0A CN104308086B (en) | 2014-10-31 | 2014-10-31 | Large-sized hollow urea core for investment casting and manufacturing process of large-sized hollow urea core |
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| CN104308086A CN104308086A (en) | 2015-01-28 |
| CN104308086B true CN104308086B (en) | 2017-02-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105478682A (en) * | 2015-11-30 | 2016-04-13 | 贵州安吉航空精密铸造有限责任公司 | Manufacturing technology of complex cavity component |
| CN105855472A (en) * | 2016-04-26 | 2016-08-17 | 东方电气集团东方汽轮机有限公司 | Manufacturing method for hollow ceramic core |
| CN107913980B (en) * | 2016-10-11 | 2024-05-17 | 北京航空材料研究院股份有限公司 | Pipe bending die |
| CN108607952A (en) * | 2018-06-19 | 2018-10-02 | 霍山县忠福机电科技有限公司 | A kind of preparation process of medium temperature wax-pattern |
| CN111112549A (en) * | 2019-02-19 | 2020-05-08 | 大成（常熟）机械有限公司 | Precision casting production process of flow divider and flow divider |
| CN112123662B (en) * | 2020-09-08 | 2022-02-01 | 哈尔滨工业大学 | Method for preparing underwater acoustic board with cavity with complex structure |
Family Cites Families (3)
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| SU555966A1 (en) * | 1974-12-18 | 1977-04-30 | Институт общей и неорганической химии АН Украинской ССР | Mixture for making water soluble rods |
| SU1766581A1 (en) * | 1989-12-22 | 1992-10-07 | Всесоюзный научно-исследовательский институт технологии судового машиностроения "Сириус" | Composition for preparation of water-soluble models and rods |
| CN103157763A (en) * | 2011-12-16 | 2013-06-19 | 洛阳奇润电力科技有限公司 | Application method of urea core and ceramic core |
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