CN103071765A - Partial air cooling method for precast aperture passage in investment casting shell - Google Patents
Partial air cooling method for precast aperture passage in investment casting shell Download PDFInfo
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- CN103071765A CN103071765A CN2012105811742A CN201210581174A CN103071765A CN 103071765 A CN103071765 A CN 103071765A CN 2012105811742 A CN2012105811742 A CN 2012105811742A CN 201210581174 A CN201210581174 A CN 201210581174A CN 103071765 A CN103071765 A CN 103071765A
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Abstract
A partial air cooling method for a precast aperture passage in an investment casting shell comprises the following steps: 1, forming a shell on a wax pattern surface according to the regular investment casting process; 2, sticking a material that can be removed from the inside of the shell through heating or with a chemistry method onto a part, needing quick cooling, of the shell surface; 3, continuing the shell forming, burying the material that can be removed from the inside of the shell through the heating or with a chemistry method into the shell, and enabling a part of the material at an air inlet and an air outlet to be naked; 4, removing the material in the shell and forming a cooling air passage; 5, performing high temperature roasting to the shell with the interior material removed according to the process requirements; and 6, using the shell for casting, introducing air into the cooling air passage according to the partial cooling requirement, and forming a strong partial convection heat exchange. According to the shape and the size of the required partial cooling part, the removable material is flexibly arranged to form a specific air passage structure, the cooling range controllability is high and the cooling rate can be controlled through the intensity of airflow.
Description
Technical field
The present invention relates to the model casting technical field, be specifically related to the local air cooling method in prefabricated duct in a kind of investment casting shells.
Background technology
In casting field, foundry goods is because the problem of cooling order can produce the casting flaws such as shrinkage cavity and porosity.In sand casting, thereby the cooldown rate that can increase by the mode of placing chill in sand mold the foundry goods part reaches the effect of control cooling order, but in model casting, can not merely adopt identical process to reach the effect that strengthens Local cooling speed.At present, the quenching technique of model casting has had concrete application at home, and process program is directly to aim at Compressed Gas to need the position of Local cooling to blow.This technique can play a role for strengthening the foundry goods Local cooling, but exists obvious deficiency, such as: the controllability of cooling range and cooldown rate is relatively poor etc.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the object of the present invention is to provide the local air cooling method in prefabricated duct in a kind of investment casting shells, the inventive method as required shape at Local cooling position and flexible in size arranges that wax bar or other can remove material, thereby form specific air passage structure, the high and cooldown rate of cooling range controllability can be controlled by the size of air-flow.
For achieving the above object, the technical solution adopted in the present invention is:
The local air cooling method in prefabricated duct comprises the steps: in a kind of investment casting shells
Step 1: at first according to normal full form casting process at wax-pattern surface shell processed;
Step 2: after the shell that makes has some strength, need the position of fast cooling to paste the material that can remove from shell inside by heating or chemical method on the shell surface, and form the passage body that is interconnected;
Step 3: continue shell processed, make the material that can remove from shell inside by heating or chemical method be embedded in shell inside, make the material at air inlet and gas outlet place stay a part exposed outside;
Step 4: remove the material of shell inside by heating or chemical method, the material position of shell inside forms cooling airway;
Step 5: carry out high-temperature roasting according to the shell of arts demand after to the material that removes shell inside;
Step 6: pass into gas to cooling airway inside when casting metal or molten metal cooling, form local strong convection heat exchange.
The described material that can remove from shell inside by heating or chemical method of step 2 is the wax bar.
The wax bar is heated, closely be affixed on the shell surface after making it softening, make the wax bar be fixed in the shell surface with bonding wax afterwards.
The shell of pasting behind the material that can remove from shell inside by heating or chemical method is continued some layers of shell processed, also can only proceed the some layers of local shell processed at the cooling airway position, afterwards shell integral body is carried out slurry seal and process, obtain complete shell.
The local air cooling method in prefabricated duct in the investment casting shells of the present invention, at the inner prefabricated air flue of shell, gas flow becomes heat convection through air flue shaped during cast, reaches the effect that improves Local cooling speed.The advantage of this technique is: 1, the as required shape at Local cooling position and size, thereby can removing material, flexible arrangement wax bar or other form specific air passage structure, and the cooling range controllability is high; 2, cooldown rate can be controlled by the size of air-flow.
Description of drawings
Accompanying drawing is for removing the mode schematic diagram of material at shell surperficial layout wax bar or other when shell processed during to certain number of plies.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
At first carry out the compacting of wax-pattern and the assembly welding of running gate system according to normal full form casting process, then shell operation processed.When shell process processed proceeds to certain number of plies, shell has been set up after certain intensity, as shown in drawings, need the fast bonding wax bar in position of cooling at foundry goods, at first toast the wax bar and make it softening, then it is pressed on the shell surface, fitted in itself and shell surface, melt a small amount of bonding wax and drip in the slit of wax bar and shell and locate, make the wax bar be fixed on the shell surface.Cool off as required shape and the size at position, can paste one the tunnel or multichannel wax bar, concrete wax bar arrangement mode can be determined according to actual conditions.If pasted multichannel wax bar, adhesion need to be carried out in the end of wax bar, form the wax bar of air inlet after the dewaxing of then at one end burn-oning, after burn-oning and dewax, the other end forms the wax bar of gas port.
Be used to form the wax bar of air cooling passage after shell fixes, proceed shell operation processed.It should be noted that during shell processed the wax bar end that forms gas port and air inlet after the dewaxing is exposed to outside the shell.After continuing the some layers of shell processed, shell integral body has had certain intensity, but the shell at cooling airway position also needs further reinforcement, so can continue to carry out at the cooling airway position shell processed of part.After the some layers of local shell processed, shell integral body is carried out slurry seal process, obtain complete shell.
When shell is carried out dewaxing treatment, should note allowing the wax bar at cooling airway position melt fully and flow out shell.Then shell is carried out high-temperature roasting.Shell after the roasting namely can be used for cast.
After the shell preheating, pour into a mould.After molten metal enters die cavity fully, use the nozzle that is complementary with the cooling airway air inlet port dimensions to insert the air inlet cooling of blowing.Gas flow forms strong convection current when cooling airway, make the molten metal fast cooling at air flue position, reaches the effect of quick cooling.Should guarantee that valve engages with air inlet firmly, the phenomenon that valve comes off can not occur like this under larger air-flow before blowing.
Invention has been described by above-described embodiment, in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to embodiment, scope of the present invention is defined by the claims.
Claims (4)
1. the local air cooling method in the interior prefabricated duct of investment casting shells is characterized in that: comprise the steps:
Step 1: at first according to normal full form casting process at wax-pattern surface shell processed;
Step 2: after the shell that makes has some strength, need the position of fast cooling to paste the material that can remove from shell inside by heating or chemical method on the shell surface, and form the passage body that is interconnected;
Step 3: continue shell processed, make the material that can remove from shell inside by heating or chemical method be embedded in shell inside, make the material at air inlet and gas outlet place stay a part exposed outside;
Step 4: remove the material of shell inside by heating or chemical method, the material position of shell inside forms cooling airway;
Step 5: carry out high-temperature roasting according to the shell of arts demand after to the material that removes shell inside;
Step 6: pass into gas to cooling airway inside when casting metal or molten metal cooling, form local strong convection heat exchange.
2. the local air cooling method in prefabricated duct in a kind of investment casting shells according to claim 1, it is characterized in that: the described material that can remove from shell inside by heating or chemical method of step 2 is the wax bar.
3. the local air cooling method in prefabricated duct in a kind of investment casting shells according to claim 2 is characterized in that: the wax bar is heated, closely be affixed on the shell surface after making it softening, make the wax bar be fixed in the shell surface with bonding wax afterwards.
4. the local air cooling method in prefabricated duct in a kind of investment casting shells according to claim 1, it is characterized in that: the shell of pasting behind the material that can remove from shell inside by heating or chemical method is continued some layers of shell processed, only proceed the some layers of local shell processed at the cooling airway position, afterwards shell integral body is carried out slurry seal and process, obtain complete shell.
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| CN2012105811742A CN103071765A (en) | 2012-12-27 | 2012-12-27 | Partial air cooling method for precast aperture passage in investment casting shell |
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| CN2012105811742A CN103071765A (en) | 2012-12-27 | 2012-12-27 | Partial air cooling method for precast aperture passage in investment casting shell |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495702A (en) * | 2013-10-11 | 2014-01-08 | 西安航空动力股份有限公司 | Precision investment casting method capable of changing coagulation and heat dissipation conditions of casting |
| CN103978156A (en) * | 2014-03-04 | 2014-08-13 | 清华大学 | Method for controlling coagulation and cooling of investment castings |
| CN104325079A (en) * | 2014-10-30 | 2015-02-04 | 西安航空动力股份有限公司 | Method for solving undercasting of precise casting |
| CN105397027A (en) * | 2015-12-02 | 2016-03-16 | 株洲中航动力精密铸造有限公司 | Casting method of casting |
| CN105750499A (en) * | 2016-04-21 | 2016-07-13 | 清华大学 | Method of utilizing conformal cold iron and forced convection to locally cool investment casting |
| CN105750494A (en) * | 2016-03-04 | 2016-07-13 | 清华大学 | Double-layer structure new casting mold |
| CN107716863A (en) * | 2017-09-12 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of combustion engine turbine bucket casting method |
| CN107812923A (en) * | 2017-09-15 | 2018-03-20 | 鹰普航空零部件（无锡）有限公司 | It is a kind of to solve the problems, such as the stainless steel pouring technology of part shrinkage porosite using Local cooling |
| CN107812883A (en) * | 2017-10-25 | 2018-03-20 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center |
| 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 |
| CN109482816A (en) * | 2018-11-07 | 2019-03-19 | 深圳市万泽中南研究院有限公司 | The manufacturing method and ceramic shell mould of casting |
| CN110483087A (en) * | 2019-09-16 | 2019-11-22 | 郑州航空工业管理学院 | Turbine blade of gas turbine hot investment casting alumina based ceramic core manufacturing method |
| CN110814289A (en) * | 2019-12-02 | 2020-02-21 | 中北大学 | Vacuum pouring, pressurizing, solidifying and casting method and device for gypsum mold |
| CN111482558A (en) * | 2020-05-20 | 2020-08-04 | 无锡卡仕精密科技有限公司 | Shell mold preparation method for preventing shrinkage porosity in deep small hole |
| 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 |
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| CN102350484A (en) * | 2011-09-30 | 2012-02-15 | 刘成文 | Method for preventing and treating wall-collapsing defect in lost foam casting |
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| CN87100476A (en) * | 1986-01-30 | 1987-09-09 | 希契纳尔制造公司 | The casting mold of exhaust and manufacture method thereof |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495702A (en) * | 2013-10-11 | 2014-01-08 | 西安航空动力股份有限公司 | Precision investment casting method capable of changing coagulation and heat dissipation conditions of casting |
| CN103978156A (en) * | 2014-03-04 | 2014-08-13 | 清华大学 | Method for controlling coagulation and cooling of investment castings |
| CN103978156B (en) * | 2014-03-04 | 2016-08-17 | 清华大学 | A kind of method controlling investment-casting solidification and cooling |
| CN104325079A (en) * | 2014-10-30 | 2015-02-04 | 西安航空动力股份有限公司 | Method for solving undercasting of precise casting |
| CN105397027A (en) * | 2015-12-02 | 2016-03-16 | 株洲中航动力精密铸造有限公司 | Casting method of casting |
| CN105750494A (en) * | 2016-03-04 | 2016-07-13 | 清华大学 | Double-layer structure new casting mold |
| CN105750499A (en) * | 2016-04-21 | 2016-07-13 | 清华大学 | Method of utilizing conformal cold iron and forced convection to locally cool investment casting |
| CN105750499B (en) * | 2016-04-21 | 2018-02-09 | 清华大学 | A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling |
| CN107716863A (en) * | 2017-09-12 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of combustion engine turbine bucket casting method |
| CN107812923A (en) * | 2017-09-15 | 2018-03-20 | 鹰普航空零部件（无锡）有限公司 | It is a kind of to solve the problems, such as the stainless steel pouring technology of part shrinkage porosite using Local cooling |
| CN107812883A (en) * | 2017-10-25 | 2018-03-20 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center |
| 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 |
| CN109482816A (en) * | 2018-11-07 | 2019-03-19 | 深圳市万泽中南研究院有限公司 | The manufacturing method and ceramic shell mould of casting |
| CN110483087A (en) * | 2019-09-16 | 2019-11-22 | 郑州航空工业管理学院 | Turbine blade of gas turbine hot investment casting alumina based ceramic core manufacturing method |
| CN110814289A (en) * | 2019-12-02 | 2020-02-21 | 中北大学 | Vacuum pouring, pressurizing, solidifying and casting method and device for gypsum mold |
| CN110814289B (en) * | 2019-12-02 | 2024-03-26 | 中北大学 | Gypsum type vacuum pouring, pressurizing and solidifying casting method and device |
| CN111482558A (en) * | 2020-05-20 | 2020-08-04 | 无锡卡仕精密科技有限公司 | Shell mold preparation method for preventing shrinkage porosity in deep small hole |
| 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 |
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Application publication date: 20130501 |