CN105750499B - A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling - Google Patents
A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling Download PDFInfo
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- CN105750499B CN105750499B CN201610251889.XA CN201610251889A CN105750499B CN 105750499 B CN105750499 B CN 105750499B CN 201610251889 A CN201610251889 A CN 201610251889A CN 105750499 B CN105750499 B CN 105750499B
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- shell
- casting
- metal tube
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- wax
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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
-
- 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
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling, this method comprise the following steps：Surface shell, transition zone shell, and the preceding layer 2-4 of backing layer shell are first prepared on casting wax mould；The attached wax-pattern for including metal tube is prepared, is bonded and is adhered on the outside of shell corresponding to cooling segment needed for casting；Carry out follow-up backing layer shell operation；Dewaxed, after baking operation, needing to obtain the attached shell for including metal tube corresponding to the position that cools down at shell；Cast enters low melting point higher boiling molten metal in attached shell, and the profile-followed chill for including metal tube is obtained after cooling；Casting pouring is carried out, fluid is passed through in metal tube and carries out convection current cooling；Reclaim profile-followed chill and metal tube.This method is simple to operate, the unobvious increase production cycle, and shape, the size of profile-followed chill can be adjusted flexibly, and is passed through the species and flow of fluid, realizes that carrying out controllable pressure to Melt casting cools down.
Description
Technical field
The present invention relates to investment casting casing field, and in particular to one kind is cast using profile-followed chill and forced convertion to fusible pattern
The method of part Local cooling.
Background technology
Model casting is poured into a mould for hot shell, and shell temperature is high, and solidification processing temperature field gradient unobvious are difficult to be formed sequentially solidifying
Gu.When the ratio of some big positions of thickness on casting, its volume and cooling surface area is larger, setting time length can be to other positions
Feeding is carried out, itself easily forms shrinkage porosity defect of contraction cavity.In the production process of model casting, frequently with the side of riser feeding
Formula prevents the generation of shrinkage cavity and porosity defect.But for some investment-castings, due to the particularity of its structure, some positions
Rising head, or the particularity due to its material, riser feeding DeGrain can not be set.
Now more methods using the cooling of chill P-Coercive.But in model casting, shell needs high-temperature roasting and pre-
Hot shell cast is carried out after heat, after chill is with shell together roasting preheating, a large amount of oxide skins can be produced, serious shadow after being contacted with casting
Casting quality is rung, and chill has certain temperature, cooling effect unobvious.This external chill is difficult to casting at perfect matching thermal center
External surface shape, it is impossible to be bonded casting completely.For thick big position, by the independent derived shortage of heat of chill, it is difficult to realize
Enough cooling effects.Therefore the use of chill receives larger limitation in model casting.
The content of the invention
In order to solve the above-mentioned problems of the prior art, it is an object of the invention to provide one kind using profile-followed chill and
To the method for investment-casting Local cooling, it is not only solved in model casting, local cooling rate is excessively slow, is also easy to produce contracting for forced convertion
The problem of hole shrinkage porosite, and with the features such as simple to operate, flexibility ratio is high, and unobvious increase the production cycle.
To reach above technical purpose, the present invention adopts the following technical scheme that：
A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling, it is characterised in that methods described
Comprise the following steps：
1) 2 to 4 layer are prepared before surface shell, transition zone shell and backing layer shell on casting wax mould；
2) wax material is coated on the outside of metal tube and forms attached wax-pattern, attached wax-pattern has upward projection, makes metal tube two
Port is stretched out outside wax material；
3) the attached wax-pattern for being coated with metal tube is bonded and is adhered on the outside of shell corresponding to cooling segment needed for casting；
4) shell processed and slurry seal operation are continued, in the upper end shell not processed that attached wax-pattern is raised；After every layer of shell operation processed,
Shell is sealed with metal tube junction using the mixed slurry of mullite powder and waterglass；Make metal tube two-port stretching type
Outside shell；
5) dewaxed, baking operation, the attached die cavity for including metal tube is obtained on the outside of main body shell；
6) low melting point higher boiling molten metal is poured into attached die cavity, the profile-followed chill for including metal tube is obtained after cooling；
7) after shell preheating and before casting solidification completely, fluid is passed through in metal tube, investment-casting is locally carried out
Cooling；
8) profile-followed chill and metal tube are reclaimed after shelling, is realized to investment-casting Local cooling.
Preferably, in above-mentioned technical proposal, the metal tube material uses copper pipe, and shape uses hollow cylinder, metal
It is 10~15cm that wax material length is stretched out at pipe both ends；It is highly preferred that it is 7~15cm that metal tube two-port, which stretches out shell length,.
Preferably, the powder liquor ratio of mullite powder and waterglass is 5~6 in the mixed slurry, and the mesh number of mullite powder is
150 to 200 mesh.
Preferably, the low melting point higher boiling metal described in step 6) uses tin or kamash alloy.
Preferably, described fluid uses air or water, after being passed through time point as cast, to gold after a length of cast when being passed through
Category liquid solidifies completely, and intake uses 0.001 to 60m3/min。
That the present invention has advantages below and a high-lighting and technique effect：1. shell number processed is constant, dewaxing, the process such as cast
It is constant, simple to operate, the unobvious increase production cycle；2. attached wax-pattern can easily process difference corresponding to profile-followed chill
Shape, can be bonded completely needs shell corresponding to cooling position, can conveniently control chill size and chill area coverage, metal tube
Shape can be bent according to shell shape, to realize preferably fitting；3. led using tin or kamash alloy as chill material
Hot good, boiling point is high, nontoxic, tin discord Modeling Material reaction, recoverable；It is 4. cold using copper pipe water cooling or ventilation
But, heat height, good cooling results are taken out of.
Brief description of the drawings
Fig. 1 is the attached wax-pattern schematic diagram that the present invention is coated with metal tube.
Fig. 2 is that the attached wax-pattern for being coated with metal tube is prepared the schematic diagram into main body shell by the present invention with the shape.
Fig. 3 is shell dewaxing of the present invention, is calcined and pours into a mould the structural representation after obtaining profile-followed chill.
Fig. 4 is the cold schematic diagram of the laggard water-filling of pouring cast part of the present invention.
Wherein：1- metal tubes；The attached wax-patterns of 2- raise up；The attached wax-patterns of 3-；4- casting wax moulds；The 3rd layer of backing layer of 5-
With shell before；The 4th layer of backing layer of 6- and shell afterwards；7- body type cavities；8- entirety shells；The attached die cavities of 9-；10- metals
Liquid；The profile-followed chills of 11-；12 conduits；13- water pumps.
Embodiment
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
It is provided by the invention it is a kind of using profile-followed chill and forced convertion to the method for investment-casting Local cooling, this method
Specifically comprise the following steps：
1) 2 to 4 layer are prepared before surface shell, transition zone shell and backing layer shell on casting wax mould 4；
2) in the outside of metal tube 1, cladding wax material forms attached wax-pattern 3, and attached wax-pattern has upward projection 2, makes metal tube
Two-port is stretched out outside wax material；As shown in figure 1, wax material prepares attached wax-pattern 3 in the cladding of the middle part of metal tube 1, metal tube can
Using copper pipe, the shape of metal tube can use hollow cylinder.The profile of attached wax-pattern is processed, processing method can use heat
Deformation or by hand cutting, are allowed to identical with needing the profile of the corresponding shell of cooling position.Two ports of metal tube are stretched out attached
Outside wax-pattern, each length 10 of extension arrives 15cm, and more preferably 7 arrive 15cm；Attached wax-pattern upper end has a upward projection
2, this raised cast gate that can turn into the profile-followed chill of cast after dewaxing, roasting.Repeat the above steps, preparation includes hollow
The attached wax-pattern of metal tube is some.Attached wax-pattern can use in the part that shell arbitrarily needs, and same shell can contain more
Individual attached wax-pattern structure, multiple profile-followed chills can be obtained after dewaxing roasting.
As shown in Fig. 2 traditionally preparing shell to the 3rd layer of completion of backing layer, now shell already has necessarily
Intensity, the profile-followed wax-pattern for the being coated with metal tube fitting prepared in Fig. 1 is adhered to and needs shell corresponding to cooling position
Outside.The shell processed operation of follow-up backing layer shell is carried out after adhesion, the attached wax-pattern for being coated with metal tube is prepared in the 3rd He
Between 4th layer of backing layer shell.It should be noted that after the completion of the 4th layer of backing layer shell and every layer afterwards shell behaviour processed, use does not come
The mixed slurry of stone flour and waterglass carries out seal operation to the intersection of metal tube and shell, and mixed slurry liquid separation ratio can use
5 to 6, mullite powder mesh number can use 150 to 200 mesh.Shell carries out dewaxing operation after being completely dried, after the completion of dewaxing operation,
Casting wax mould 4 melts discharge and forms casting body type cavity 7, and formation is profile-followed cold after being coated with the thawing discharge of attached wax-pattern 3 of copper pipe
The attached die cavity 9 of iron, the attached die cavity include the metal tube 1 run through.After Baking, poured into a mould in attached die cavity and enter low melting point
Higher boiling molten metal, tin or kamash alloy can be used, profile-followed chill 11 is formed after cooling, the profile-followed chill is included through copper pipe 1.
As shown in figure 3, casting pouring is carried out in main body shell, can be by conduit 12, using water pump 13 in gold after cast
Belong to water flowing or air in pipe 1 and carry out circulating cooling, it is complete to molten metal after a length of cast when being passed through after being passed through time point as cast
Solidification, intake can be adjusted according to the needs of casting each several part cooldown rate, and generally 0.001 to 60m3/min.With
Shape chill is tightly combined with shell, and tin or kamash alloy thermal conductivity are good, can be rapidly by gradual heat absorption, while is used and followed
The measure of ring water cooling by the heat derives in profile-followed chill, so as to locally effectively be cooled down to Melt casting, is dropped in time
There is the probability of shrinkage cavity shrinkage porosity in low part.Finally tin alloy block and metal tube are reclaimed after shelling operates.
Claims (5)
- A kind of 1. method using profile-followed chill and forced convertion to investment-casting Local cooling, it is characterised in that methods described bag Include following steps：1) first 2 to 4 layers of surface shell, transition zone shell and backing layer shell are prepared on casting wax mould (4)；2) cladding wax material forms attached wax-pattern (3) on the outside of metal tube (1), and attached wax-pattern has upward projection (2), makes metal Pipe two-port is stretched out outside wax material；3) the attached wax-pattern for being coated with metal tube is bonded and is adhered on the outside of shell corresponding to cooling segment needed for casting；4) shell processed and slurry seal operation are continued, in the upper end shell not processed that attached wax-pattern is raised；After every layer of shell operation processed, in shell Sealed with metal tube junction using the mixed slurry of mullite powder and waterglass；Make metal tube two-port stretch out shell it Outside；5) dewaxed, baking operation, the attached die cavity (9) for including metal tube is obtained on the outside of main body shell (7)；6) low melting point higher boiling molten metal is poured into attached die cavity, the profile-followed chill (11) for including metal tube is obtained after cooling；7) after shell preheating and before casting solidification completely, fluid is passed through in metal tube, investment-casting is locally cooled down； Described fluid uses air or water, after being passed through time point as cast, solidifies, leads to completely to molten metal after a length of cast when being passed through Enter amount to be adjusted according to the needs of casting each several part cooldown rate, intake is 0.001 to 60m3/min；8) profile-followed chill and metal tube are reclaimed after shelling, is realized to investment-casting Local cooling.
- 2. according to a kind of method using profile-followed chill and forced convertion to investment-casting Local cooling described in claim 1, It is characterized in that：Metal tube material described in step 2) uses copper pipe, and shape uses hollow cylinder, and wax is stretched out at metal tube both ends Expect that length is 10~15cm.
- 3. according to a kind of method using profile-followed chill and forced convertion to investment-casting Local cooling described in claim 2, It is characterized in that：It is 7~15cm that metal tube two-port, which stretches out shell length, in step 4).
- 4. according to a kind of described in claim 1,2 or 3 using profile-followed chill and forced convertion to investment-casting Local cooling Method, it is characterised in that：The powder liquor ratio of mullite powder and waterglass is 5~6 in the mixed slurry, and the mesh number of mullite powder is 150 to 200 mesh.
- 5. according to a kind of described in claim 1,2 or 3 using profile-followed chill and forced convertion to investment-casting Local cooling Method, it is characterised in that：Low melting point higher boiling metal described in step 6) uses tin or kamash alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251889.XA CN105750499B (en) | 2016-04-21 | 2016-04-21 | A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251889.XA CN105750499B (en) | 2016-04-21 | 2016-04-21 | A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling |
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| CN105750499A CN105750499A (en) | 2016-07-13 |
| CN105750499B true CN105750499B (en) | 2018-02-09 |
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| CN201610251889.XA Expired - Fee Related CN105750499B (en) | 2016-04-21 | 2016-04-21 | A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling |
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| CN106735097A (en) * | 2016-11-30 | 2017-05-31 | 邢振国 | A kind of adjustable biliquid casting bimetal composite process of cooling rate |
| CN107891122B (en) * | 2017-12-12 | 2020-08-25 | 中国兵器工业第五九研究所 | Method for controlling solidification defect of aluminum alloy precision casting |
| CN113547079A (en) * | 2021-07-28 | 2021-10-26 | 贵州安吉航空精密铸造有限责任公司 | Alloy casting molding method |
| CN113600752A (en) * | 2021-08-09 | 2021-11-05 | 贵州安吉航空精密铸造有限责任公司 | Investment casting molding method |
| CN113996751A (en) * | 2021-10-13 | 2022-02-01 | 中国航发北京航空材料研究院 | Method for refining local structure grains by titanium alloy precision casting |
| CN114178505A (en) * | 2021-12-13 | 2022-03-15 | 东营诚扬精密机械有限公司 | Accurate forming method for internal pipeline of light alloy casing |
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| CN87102954A (en) * | 1987-04-21 | 1988-11-09 | 崔尔信 | Casting method for thin-wall metal mould |
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| CN103192027A (en) * | 2013-03-28 | 2013-07-10 | 清华大学 | Partial cooling method of cold iron in investment casting |
| CN203390152U (en) * | 2013-06-08 | 2014-01-15 | 温州锐特铸造有限公司 | Novel valve investment composite shell mold |
| CN103978156A (en) * | 2014-03-04 | 2014-08-13 | 清华大学 | Method for controlling coagulation and cooling of investment castings |
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| JP4650067B2 (en) * | 2005-04-06 | 2011-03-16 | 日産自動車株式会社 | Manufacturing method of mold cooling structure |
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2016
- 2016-04-21 CN CN201610251889.XA patent/CN105750499B/en not_active Expired - Fee Related
Patent Citations (6)
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|---|---|---|---|---|
| CN87102954A (en) * | 1987-04-21 | 1988-11-09 | 崔尔信 | Casting method for thin-wall metal mould |
| CN101543889A (en) * | 2008-03-27 | 2009-09-30 | 李寿海 | Automatic thermostatic metal pouring die |
| CN103071765A (en) * | 2012-12-27 | 2013-05-01 | 清华大学 | Partial air cooling method for precast aperture passage in investment casting shell |
| CN103192027A (en) * | 2013-03-28 | 2013-07-10 | 清华大学 | Partial cooling method of cold iron in investment casting |
| CN203390152U (en) * | 2013-06-08 | 2014-01-15 | 温州锐特铸造有限公司 | Novel valve investment composite shell mold |
| CN103978156A (en) * | 2014-03-04 | 2014-08-13 | 清华大学 | Method for controlling coagulation and cooling of investment castings |
Non-Patent Citations (1)
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| CN105750499A (en) | 2016-07-13 |
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Inventor after: Lv Zhigang Inventor after: Wei Yameng Inventor after: Hu Kehui Inventor after: Liu Wei Inventor after: Guo Xin Inventor before: Lv Zhigang Inventor before: Wei Yameng Inventor before: Hu Kehui Inventor before: Liu Wei |
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Granted publication date: 20180209 |
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