CN107855503A - A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring - Google Patents
A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring Download PDFInfo
- Publication number
- CN107855503A CN107855503A CN201711046049.0A CN201711046049A CN107855503A CN 107855503 A CN107855503 A CN 107855503A CN 201711046049 A CN201711046049 A CN 201711046049A CN 107855503 A CN107855503 A CN 107855503A
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- Prior art keywords
- depoling
- core
- based ceramic
- alumina based
- airflow stirring
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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
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/002—Removing cores by leaching, washing or dissolving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/003—Removing cores using heat
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring, mainly include the units such as normal pressure soda boiling core-removing device, nitrogen gas generator.In the middle and later periods of hollow turbine vane depoling work, the core removing speed of coolant flow channel depths is slower, main cause is the alkali lye dyskinesia of coolant flow channel depths, depoling product at this, which cannot rely on alkali lye motion and wash away, to come off from whose surfaces so as to be covered in whose surfaces, and then hinders the fast reaction of interior core material and aqueous slkali.Nitrogen gas generator in the present invention, to supplying nitrogen near the core of coolant flow channel depths, produces airflow stirring effect by corrosion-resistant small hose.The alkali lye that can cause runner depths by airflow stirring moves, and promotes the depoling product of coolant flow channel depths to be come off from whose surfaces.It is slower that the present invention is used for coolant flow channel depths core removing speed during solving the problems, such as alumina based ceramic core normal pressure soda boiling depoling.
Description
Technical field
The invention belongs to hollow turbine vane manufacturing technology field, and in particular to one kind improves aluminum oxide by airflow stirring
Base ceramic core removes the depoling equipment of speed.
Background technology
Modern aeroengine and gas turbine use hollow turbine vane, and turbo blade working environment is extremely severe,
Extreme temperatures, the simple temperature tolerance by improving high temperature alloy can not meet blade requirement, it is necessary to lean against blade interior
Coolant flow channel is manufactured to meet job requirement.To manufacture the coolant flow channel of blade interior, it is necessary to manufacture and tied using with corresponding
The ceramic core of structure.At present, ceramic core material is mainly aluminum oxide and silica, compared with silica fundamental mode core, aluminum oxide
Base ceramic core has higher high temperature creep resistance and chemical stability, therefore in high-temperature alloy blades casting process of new generation
In be used widely.
But compared with silica fundamental mode core, the removing of alumina base core is difficult.At present, for alumina-based ceramic type
The main flow removal methods of core have two classes, HTHP depoling method and normal pressure soda boiling depoling method.Wherein HTHP depoling method depoling
Speed is very fast, but depoling reaction product is easily formed in whose surfaces and covered, it is difficult to ensures the continuation of high speed depoling, and high pressure is set
It is standby potential safety hazard to be present；And normal pressure soda boiling depoling rule can lean on alkali lye motion caused by wallop that depoling is reacted into production in time
Thing washes away, and device security is high, therefore utilization rate is higher.But cause in the middle and later periods of normal pressure soda boiling depoling, wallop
Runner depths alkali lye motion it is weaker, it is difficult to effectively remove the depoling product of coolant flow channel depths whose surfaces.Depoling product
Covering can hinder the quick progress that depoling is reacted, and cause the removing speed of coolant flow channel depths core relatively low.Therefore, research can carry
The depoling equipment of high coolant flow channel depths core removing speed is significant.
The content of the invention
Alumina based ceramic core removing speed is improved by airflow stirring object of the present invention is to provide a kind of
Depoling equipment.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that to realize：
A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring, takes off comprising normal pressure soda boiling
Core apparatus, nitrogen gas generator, corrosion-resistant small hose, blast pipe；Wherein,
Normal pressure soda boiling core-removing device includes reaction chamber and the air inlet and blast pipe that are arranged at the top of reaction chamber, work
When, nitrogen gas generator is connected by corrosion-resistant small hose with normal pressure soda boiling core-removing device, reaction chamber built with depoling liquid, for pair
Core in hollow turbine vane carries out removing processing；Nitrogen is transported to cooling stream by nitrogen gas generator by corrosion-resistant small hose
The near surface position of road depths core, airflow stirring is carried out to the depoling liquid at this, causes depoling liquid movement at this, so as to promote
Enter coming off for whose surfaces depoling reaction product, and discharged gas unnecessary in reaction chamber by blast pipe.
Further improve of the invention is that normal pressure soda boiling core-removing device bottom is provided with heating furnace, and heating furnace is from bag
The electric furnace of automatic temperature control function is included, the heating temperature range to depoling liquid in reaction chamber is 120 DEG C~250 DEG C.
Further improve of the invention is that the mass concentration scope of high-temperature high concentration alkali lye is 50%~70%, by KOH
Water is dissolved in be formulated.
Further improve of the invention is that nitrogen gas generator gas outlet is provided with the control gentle uninterrupted of air-flow break-make
Switch valve, and provide nitrogen gas purity more than 99.99%.
Further improve of the invention is that corrosion-resistant small hose is made up of polytetrafluoroethylmaterial material, and its caliber scope is
0.3mm~2mm, and multiple branches can be formed.
Further improve of the invention is that the core in hollow turbine vane is alumina based ceramic core, and hollow
The size range of turbo blade is 50mm~300mm.
Further improve of the invention is that reaction chamber is made of the monel alloy of resistance to alkali liquid corrosion, to ensure
Working life under high-temperature high concentration alkali lye operating mode.
The present invention has the advantage that：
Depoling equipment in the present invention includes normal pressure soda boiling core-removing device, nitrogen gas generator, corrosion-resistant small hose and exhaust
The parts such as pipe, belong to normal pressure depoling category.The equipment can keep the lasting high efficiency that depoling is reacted in normal pressure alkali cooking process, this
It is because in depoling early stage, the depoling product of whose surfaces covering is washed away mainly by depoling liquid movement caused by wallop, and
In the depoling middle and later periods, corrosion-resistant small hose of the nitrogen gas generator by inserting coolant flow channel depths is formed to nitrogen provided herein
Airflow stirring acts on, to strengthen the motion of depoling liquid herein, so as to promote the de- of coolant flow channel depths whose surfaces depoling product
Fall.The air-flow that the equipment introduces will not pollute to depoling liquid, because containing carbon dioxide in air, if using empty
Air-flow is stirred to depoling liquid, and carbon dioxide can react with the hydroxide ion in depoling liquid, so as to reduce depoling liquid concentration,
And nitrogen caused by nitrogen gas generator will not react with the hydroxide ion in depoling liquid, the concentration of depoling liquid will not be reduced.Should
Equipment will not reduce the contact area of depoling liquid and core because throughput is excessive, also will not cause to take off because of throughput is too small
Core liquid movement is excessively weak, because the switch valve of nitrogen gas generator gas outlet can be with the size of adjustment control air-flow.The equipment is not
Can be in the presence of Keep Clear-High Voltage, because gas unnecessary in reaction chamber can be discharged by blast pipe.
Further, the depoling liquid in the present invention uses the alkali lye of high-temperature high concentration, can realize alkali lye and core fast reaction,
Because alkali lye and core reaction speed are very fast in the case of high-temperature high concentration.
Further, the air-flow that the nitrogen gas generator in the present invention provides, will not be polluted to alkali lye, because nitrogen
The nitrogen that generator provides is practically free of carbon dioxide, will not be reacted with the hydroxide ion in alkali lye and reduce alkali concn.
Further, the air-flow that nitrogen gas generator of the invention provides will not reduce depoling liquid and type because throughput is excessive
The contact area of core, also because throughput is too small depoling liquid movement will not be caused excessively weak, because nitrogen gas generator outlet
The switch valve of mouth can be with the size of adjustment control air-flow.
Further, the nitrogen gas generator in the present invention can provide air-flow with long-time stable to multiple coolant flow channels, this
It is that resistance to alkali liquid corrosion is very competent, and corrosion-resistant small hose because corrosion-resistant small hose is made of polytetrafluoroethylmaterial material
Multiple branches can be formed and correspond to different coolant flow channels respectively.
In summary, present invention mainly solves the removing problem of hollow turbine vane alumina based ceramic core, this be because
High for aluminum oxide core chemical stability, removing is difficult.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
In figure：1st, heating furnace；2nd, hollow turbine vane；3rd, core；4th, depoling liquid；5th, switch valve；6th, nitrogen gas generator；7、
Corrosion-resistant small hose；8th, reaction chamber；9th, blast pipe.
Embodiment
The present invention is made further instructions below in conjunction with drawings and examples.
A kind of alumina based ceramic core is improved by airflow stirring remove speed as shown in figure 1, proposed by the present invention
Depoling equipment, including normal pressure soda boiling core-removing device, nitrogen gas generator, corrosion-resistant small hose and blast pipe, concrete structure are as follows：
1) normal pressure soda boiling core-removing device includes reaction chamber 8, and its bottom is provided with heating furnace 1, top offer air inlet and
Blast pipe 9, it is internally provided with depoling liquid 4, and corrosion-resistant small hose 7 connects with air inlet.
2) gas outlet of nitrogen gas generator 6 is provided with the switch valve 5 of control nitrogen stream size.
3) corrosion-resistant small hose 7 can form multiple branches, correspond to different coolant flow channels respectively.
At depoling initial stage, hollow turbine vane 2 is put into progress normal pressure soda boiling, the stage wallop in reaction chamber 8 and drawn
The depoling liquid 4 risen moves the depoling reaction product that will timely wash away the surface of core 3；In the depoling middle and later periods, in coolant flow channel
Core 3 be corroded to depths, now corrosion-resistant small hose 7 is inserted in the coolant flow channel of hollow turbine vane 2, open
Nitrogen gas generator 6 is passed through nitrogen stream, and sets air-flow size by the switch valve 5 of the gas outlet of nitrogen gas generator 6, and the stage leads to
The air-flow entered can cause depoling liquid 4 to move, and wash away the depoling reaction product on the surface of core 3 in time, make depoling reaction keep continuing
High efficiency.Meanwhile unnecessary gas will be discharged by blast pipe 9 in reaction chamber 8.
Embodiment
Prepare the depoling liquid 4 of debita spissitudo first in the reaction chamber 8 of normal pressure soda boiling core-removing device, the amount of depoling liquid 4 with
It can will treat that depoling hollow turbine vane 2 floods and be advisable, then start to warm up and be heated to depoling liquid 4 and seethe with excitement.During one section of continuous depoling
Between after, the core 3 in runner to be cooled has been etched to depths, and pause depoling simultaneously takes out blade, then by corrosion-resistant jewelry, expensive clothing and other valuables
One end of pipe 7 is branched off into multichannel and inserted respectively in different coolant flow channels, and the other end is connected with nitrogen gas generator 6.Pass through regulation
The switch valve 5 of the gas outlet of nitrogen gas generator 6 adjusts air-flow size, because air-flow too conference reduces depoling liquid 4 and core 3 surface
Contact area and hinder the progress of reaction, and air-flow it is too small caused by depoling liquid 4 move also weaker, do not have and wash away reaction production
The effect of thing.In the course of work, unnecessary gas is discharged by blast pipe 9 in reaction chamber 8, with the shape of normal pressure in maintenance reaction chamber
State.
Claims (8)
- A kind of 1. depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring, it is characterised in that including Normal pressure soda boiling core-removing device, nitrogen gas generator (6), corrosion-resistant small hose (7), blast pipe (9)；Wherein,Normal pressure soda boiling core-removing device includes reaction chamber (8) and the air inlet and blast pipe (9) that are arranged at the top of reaction chamber (8), During work, nitrogen gas generator (6) is connected by corrosion-resistant small hose (7) with normal pressure soda boiling core-removing device, reaction chamber (8) built with Depoling liquid (4), for carrying out removing processing to the core (3) in hollow turbine vane (2)；Nitrogen gas generator (6) leads to nitrogen The near surface position that corrosion-resistant small hose (7) is transported to coolant flow channel depths core (3) is crossed, the depoling liquid (4) at this is entered Row airflow stirring, cause depoling liquid (4) at this to move, so as to promote coming off for core (3) surface depoling reaction product, and pass through Blast pipe (9) discharges gas unnecessary in reaction chamber (8).
- 2. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that normal pressure soda boiling core-removing device also includes the heating furnace (1) for being arranged on reaction chamber (8) bottom.
- 3. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 2 is set It is standby, it is characterised in that heating furnace (1) is from the electric furnace for including automatic temperature control function, to the interior depoling liquid of reaction chamber (8) (4) heating temperature range is 120 DEG C~250 DEG C.
- 4. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that depoling liquid (4) is high-temperature high concentration alkali lye, and the mass concentration scope of high-temperature high concentration alkali lye is 50% ~70%, water is dissolved in by KOH and is formulated.
- 5. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that nitrogen gas generator (6) gas outlet is provided with the switch valve (5) of control air-flow size, and the nitrogen provided is pure Degree is more than 99.99%.
- 6. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that corrosion-resistant small hose (7) is made up of polytetrafluoroethylmaterial material, and its caliber scope is 0.3mm~2mm, and is had Multiple branches.
- 7. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that the core (3) in hollow turbine vane (2) is alumina based ceramic core, and the chi of hollow turbine vane Very little scope is 50mm~300mm.
- 8. a kind of depoling that alumina based ceramic core removing speed is improved by airflow stirring according to claim 1 is set It is standby, it is characterised in that reaction chamber (8) is made of the monel alloy of resistance to alkali liquid corrosion, for ensureing in high-temperature high concentration alkali Working life under liquid operating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711046049.0A CN107855503A (en) | 2017-10-31 | 2017-10-31 | A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711046049.0A CN107855503A (en) | 2017-10-31 | 2017-10-31 | A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring |
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| CN107855503A true CN107855503A (en) | 2018-03-30 |
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| CN201711046049.0A Pending CN107855503A (en) | 2017-10-31 | 2017-10-31 | A kind of depoling equipment that alumina based ceramic core removing speed is improved by airflow stirring |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153397A (en) * | 2019-07-01 | 2019-08-23 | 深圳市周大福珠宝制造有限公司 | A kind of core-removing device and method |
| CN110328341A (en) * | 2019-08-09 | 2019-10-15 | 兴化市兴东铸钢有限公司 | A kind of silicon-base ceramic core removal methods |
| CN112191829A (en) * | 2020-10-10 | 2021-01-08 | 中国航发北京航空材料研究院 | Core removing kettle and method for precisely casting hollow blade core |
| CN112427625A (en) * | 2020-11-12 | 2021-03-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for removing ceramic core for blade with integral casting cover plate structure |
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| CN107127323A (en) * | 2017-06-13 | 2017-09-05 | 西安交通大学 | A kind of method and apparatus for improving ceramic core depoling efficiency |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153397A (en) * | 2019-07-01 | 2019-08-23 | 深圳市周大福珠宝制造有限公司 | A kind of core-removing device and method |
| CN110153397B (en) * | 2019-07-01 | 2021-05-11 | 深圳市周大福珠宝制造有限公司 | Core removing device and method |
| CN110328341A (en) * | 2019-08-09 | 2019-10-15 | 兴化市兴东铸钢有限公司 | A kind of silicon-base ceramic core removal methods |
| CN112191829A (en) * | 2020-10-10 | 2021-01-08 | 中国航发北京航空材料研究院 | Core removing kettle and method for precisely casting hollow blade core |
| CN112427625A (en) * | 2020-11-12 | 2021-03-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for removing ceramic core for blade with integral casting cover plate structure |
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