CN105750499A - Method of utilizing conformal cold iron and forced convection to locally cool investment casting - Google Patents
Method of utilizing conformal cold iron and forced convection to locally cool investment casting Download PDFInfo
- Publication number
- CN105750499A CN105750499A CN201610251889.XA CN201610251889A CN105750499A CN 105750499 A CN105750499 A CN 105750499A CN 201610251889 A CN201610251889 A CN 201610251889A CN 105750499 A CN105750499 A CN 105750499A
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- China
- Prior art keywords
- shell
- metal tube
- casting
- investment
- 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
Abstract
The invention discloses a method of utilizing conformal cold iron and forced convection to locally cool an investment casting.The method includes following steps: preparing a surface layer shell, a transition layer shell and first 2-4 layers of a back layer shell on a casting wax mould; preparing an auxiliary wax mould containing a metal pipe inside, and pasting and adhering the auxiliary wax mould on the outer side of the shell corresponding to a portion, needing to be cooled, of the casting; performing subsequent back layer shell making; dewaxing and calcining, and obtaining an auxiliary shell containing a metal pipe inside at the shell corresponding to the portion needing to be cooled; pouring low-smelting-point high-boiling-point metal liquid into the auxiliary shell, and cooling to obtain the conformal cold iron containing a metal pipe inside; pouring the casting, feeding fluid into the metal pipes for convection cooling; recycling the conformal cold iron and the metal pipes.The method is simple to operate, production period is not prolonged remarkably, shape and size of the conformal cold iron and type and flow of the fluid which is fed can be adjusted flexibly, and controllable forced cooling of the precise investment casting is realized.
Description
Technical field
The present invention relates to investment casting casing field, be specifically related to a kind of utilize conformal chill and the forced convertion method to investment-casting Local cooling.
Background technology
Model casting is the cast of hot shell, and shell temperature is high, and inconspicuous being difficult to of solidification processing temperature field gradient forms consecutive solidification.Some thick large part on foundry goods, when its volume is bigger with the ratio of cooling surface area, setting time is long, other positions can be carried out feeding, and itself easily forms shrinkage porosity defect of contraction cavity.In the production process of model casting, prevent the generation of shrinkage cavity and porosity defect frequently with the mode of riser feeding.But for some investment-casting, due to the particularity of its structure, some position cannot arrange rising head, or due to the particularity of its material, riser feeding DeGrain.
The now methods adopting the cooling of chill P-Coercive more.But in model casting, shell carries out hot shell cast after needing high-temperature roasting and preheating, and chill, with, after shell together roasting preheating, producing a large amount of oxide skin, has a strong impact on casting quality with foundry goods after contacting, and chill has had uniform temperature, and cooling effect is inconspicuous.This external chill is difficult to Perfect Matchings thermal center place cast outer surface shape, it is impossible to foundry goods of fitting completely.For thick large part, rely on the shortage of heat that chill is individually derived, it is difficult to realize enough cooling effects.Therefore the use of chill receives bigger restriction in model casting.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, it is an object of the invention to provide and a kind of utilize conformal chill and the forced convertion method to investment-casting Local cooling, it is made not only to solve local cooling rate in model casting excessively slow, the problem being easily generated shrinkage cavity shrinkage porosity, and have simple to operate, the features such as flexibility ratio is high, the inconspicuous increase production cycle.
For reaching above technical purpose, the present invention adopts the following technical scheme that
A kind of utilize conformal chill and the forced convertion method to investment-casting Local cooling, it is characterised in that described method comprises the steps:
1) on casting wax mould, prepare before surface shell, transition zone shell and backing layer shell 2 to 4 layers；
2) being coated with wax material outside metal tube and form attached wax-pattern, attached wax-pattern has projection upwards, makes metal tube two-port stretch out outside wax material；
3) outside the shell that needed for being fitted and adhere to foundry goods by the attached wax-pattern being coated with metal tube, cooling segment is corresponding；
4) shell processed and slurry seal operation are proceeded, at the upper end shell not processed that attached wax-pattern is protruding；After every layer of shell processed operation, the mixed slurry of mullite powder and waterglass is adopted to seal in shell and metal tube junction；Metal tube two-port is made to stretch out outside shell；
5) carry out dewaxing, baking operation, outside main body shell, obtain the attached die cavity including metal tube；
6) in attached die cavity, pour into low melting point high boiling point molten metal, after cooling, obtain the conformal chill including metal tube；
7), after shell preheats and before foundry goods solidifies completely, in metal tube, pass into fluid, investment-casting local is cooled down；
8) conformal chill and metal tube are reclaimed after shelling, it is achieved to investment-casting Local cooling.
Preferably, in technique scheme, described metal tube material adopts copper pipe, and shape adopts hollow cylinder, and metal tube two ends are stretched out wax material length and are 10～15cm；It is highly preferred that metal tube two-port stretches out shell length is 7～15cm.
Preferably, in described mixed slurry, mullite powder is 5～6 with the powder liquor ratio of waterglass, and the order number of mullite powder is 150 to 200 orders.
Preferably, step 6) described in low melting point high boiling point metal adopt stannum or kamash alloy.
Preferably, described fluid adopts air or water, passes into time point for, after cast, passing into duration for solidifying completely to molten metal after cast, and intake adopts 0.001 to 60m3/min。
The present invention have the following advantages and salience and technique effect: 1. shell number processed is constant, dewaxing, and the operation such as cast is constant, simple to operate, the inconspicuous increase production cycle；2. the attached wax-pattern that conformal chill is corresponding can process difformity easily, can completely fit and need to cool down the shell that position is corresponding, can conveniently controlling chill size and chill area coverage, metal tube shape can be curved according to shell shape, to realize better laminating；3. adopting stannum or kamash alloy as chill material, heat conductivity is good, and boiling point is high, nontoxic, stannum discord Modeling Material reaction, recoverable；4. adopt copper pipe water-cooled or ventilating and cooling, take heat height, good cooling results out of.
Accompanying drawing explanation
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 conformal being coated with metal tube is prepared the schematic diagram entering main body shell by the present invention.
Fig. 3 is shell of the present invention dewaxing, and roasting also pours into a mould the structural representation after obtaining conformal chill.
Fig. 4 carries out water-cooled schematic diagram after pouring cast part of the present invention.
Wherein: 1-metal tube；Raising up of the attached wax-pattern of 2-；The attached wax-pattern of 3-；4-casting wax mould；The 3rd layer of backing layer of 5-and shell before；The 4th layer of backing layer of 6-and shell afterwards；7-main body die cavity；8-entirety shell；The attached die cavity of 9-；10-molten metal；11-conformal chill；12 conduits；13-water pump.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Provided by the invention a kind of utilizing conformal chill and the forced convertion method to investment-casting Local cooling, the method specifically includes following steps:
1) on casting wax mould 4, prepare before surface shell, transition zone shell and backing layer shell 2 to 4 layers；
2) being coated with wax material outside metal tube 1 and form attached wax-pattern 3, attached wax-pattern has projection 2 upwards, makes metal tube two-port stretch out outside wax material；As it is shown in figure 1, in cladding, wax material prepares attached wax-pattern 3 in the middle part of metal tube 1, metal tube can adopt copper pipe, and the shape of metal tube can adopt hollow cylinder.The profile of attached wax-pattern is processed, and processing method can adopt thermal deformation or manual cutting, so as to identical with the profile needing the corresponding shell in cooling position.Two ports of metal tube stretch out outside attached wax-pattern, and each length 10 of extension arrives 15cm, more preferably 7 arrive 15cm；Attached wax-pattern upper end has a projection 2 upwards, and this projection can become the cast gate of cast conformal chill after dewaxing, roasting.Repeat the above steps, the attached wax-pattern that preparation includes hollow metal tube is some.Attached wax-pattern can use in the part that shell arbitrarily needs, and same shell can contain multiple attached wax-pattern structures, can obtain multiple conformal chill after dewaxing roasting.
Completing as in figure 2 it is shown, prepare shell traditionally to backing layer the 3rd layer, now shell has been provided with certain intensity, the conformal wax-pattern laminating being coated with metal tube prepared is sticked to outside the shell needing cooling position corresponding in Fig. 1.Carry out the shell processed operation of follow-up backing layer shell after adhesion, the attached wax-pattern being coated with metal tube is prepared between the 3rd and the 4th layer of backing layer shell.It should be noted that, after 4th layer of backing layer shell and every layer afterwards shell processed have been grasped, the intersection of metal tube and shell is carried out seal operation by the mixed slurry using mullite powder and waterglass, and mixed slurry separatory ratio can adopt 5 to 6, and mullite powder order number can adopt 150 to 200 orders.Shell carries out dewaxing operation after being completely dried, and after dewaxing operation completes, casting wax mould 4 melts discharges formation foundry goods main body die cavity 7, forms the attached die cavity 9 of conformal chill after being coated with the attached wax-pattern 3 thawing discharge of copper pipe, and this attached die cavity includes the metal tube 1 run through.After Baking, in attached die cavity, cast enters low melting point high boiling point molten metal, can adopt stannum or kamash alloy, forms conformal chill 11 after cooling, and this conformal chill includes and runs through copper pipe 1.
As shown in Figure 3, casting pouring is carried out in main body shell, conduit 12 can be passed through after cast, water pump 13 water flowing or air in metal tube 1 is used to be circulated cooling, pass into time point for after cast, passing into duration for solidifying completely to molten metal after cast, intake can be adjusted according to the needs of foundry goods each several part cooldown rate, is generally 0.001 to 60m3/min.Conformal chill and shell are tightly combined, and stannum or kamash alloy heat conductivity are well, rapidly by heat absorption gradually, recirculated water cooling measure can be adopted to be derived by the heat in conformal chill in time simultaneously, thus Melt casting local is effectively cooled down, reduce local and the probability of shrinkage cavity shrinkage porosity occurs.Last recovery ashbury metal block and metal tube after shelling operation.
Claims (6)
1. one kind utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterised in that described method comprises the steps:
1) prepare surface shell, transition zone shell and backing layer shell on casting wax mould (4) first 2 to 4 layers；
2) forming attached wax-pattern (3) at metal tube (1) outside cladding wax material, attached wax-pattern has projection (2) upwards, makes metal tube two-port stretch out outside wax material；
3) outside the shell that needed for being fitted and adhere to foundry goods by the attached wax-pattern being coated with metal tube, cooling segment is corresponding；
4) shell processed and slurry seal operation are proceeded, at the upper end shell not processed that attached wax-pattern is protruding；After every layer of shell processed operation, the mixed slurry of mullite powder and waterglass is adopted to seal in shell and metal tube junction；Metal tube two-port is made to stretch out outside shell；
5) carry out dewaxing, baking operation, obtain, in main body shell (7) outside, the attached die cavity (9) including metal tube；
6) in attached die cavity, pour into low melting point high boiling point molten metal, after cooling, obtain the conformal chill (11) including metal tube；
7), after shell preheats and before foundry goods solidifies completely, in metal tube, pass into fluid, investment-casting local is cooled down；
8) conformal chill and metal tube are reclaimed after shelling, it is achieved to investment-casting Local cooling.
2. a kind of described in claim 1 utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterized in that: step 2) described in metal tube material adopt copper pipe, shape adopts hollow cylinder, and metal tube two ends are stretched out wax material length and are 10～15cm.
3. a kind of described in claim 2 utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterised in that: step 4) in metal tube two-port stretch out shell length and be 7～15cm.
4. a kind of described in claim 1,2 or 3 utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterized in that: in described mixed slurry, mullite powder is 5～6 with the powder liquor ratio of waterglass, and the order number of mullite powder is 150 to 200 orders.
5. a kind of described in claim 1,2 or 3 utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterised in that: step 6) described in low melting point high boiling point metal adopt stannum or kamash alloy.
6. a kind of described in claim 1,2 or 3 utilizes conformal chill and the forced convertion method to investment-casting Local cooling, it is characterized in that: step 7) described in fluid adopt air or water, pass into time point for after cast, passing into duration for solidifying completely to molten metal after cast, intake adopts 0.001 to 60m3/min。
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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| Publication Number | Publication Date |
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| CN105750499A true CN105750499A (en) | 2016-07-13 |
| CN105750499B 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735097A (en) * | 2016-11-30 | 2017-05-31 | 邢振国 | A kind of adjustable biliquid casting bimetal composite process of cooling rate |
| CN107891122A (en) * | 2017-12-12 | 2018-04-10 | 中国兵器工业第五九研究所 | A kind of precision aluminium-alloy casting solidification defect control method |
| 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735097A (en) * | 2016-11-30 | 2017-05-31 | 邢振国 | A kind of adjustable biliquid casting bimetal composite process of cooling rate |
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| 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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| CN105750499B (en) | 2018-02-09 |
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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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