CN108080576A - A kind of medium temperature wax precision-investment casting ceramic core preprocess method - Google Patents
A kind of medium temperature wax precision-investment casting ceramic core preprocess method Download PDFInfo
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- CN108080576A CN108080576A CN201711252177.0A CN201711252177A CN108080576A CN 108080576 A CN108080576 A CN 108080576A CN 201711252177 A CN201711252177 A CN 201711252177A CN 108080576 A CN108080576 A CN 108080576A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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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
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Abstract
The invention discloses a kind of medium temperature wax precision-investment casting ceramic core preprocess method, the preprocess method comprises the following steps：The ceramic core that step 1. will act as medium temperature wax precision-investment casting is immersed in paraffin water-in-oil emulsion, carries out impregnation, and paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core；Processing is dried in the ceramic core impregnated by step 2., and dried ceramic core is used as suppressing wax-pattern with medium temperature wax.The present invention can either be effectively reduced the brittleness of ceramic core and improve its toughness, being tightly combined property, stability and the reliability of ceramic core and medium temperature wax wax-pattern can be effectively improved again, ceramic core when can also be effectively reduced dewaxing bears the applied stress of medium temperature wax, so as to advantageously reduce the shaping difficulty of hollow casting ceramic shell, be also conducive to improve the Forming Quality of hollow casting ceramic shell.
Description
Technical field
The present invention relates to the melted module precise casting technologies of hollow casting, are specifically a kind of medium temperature wax precision-investment casting
The preprocess method of ceramic core, its particularly suitable gas turbine turbine hollow blade or aero-engine hollow turbine vane etc.
The precision-investment casting of hollow casting.
Background technology
In the melted module precise casting technology of hollow casting, the preparation of ceramic shell is by " ceramic core+wax-pattern "
What mode was realized, and wax-pattern is typically to be formed with wax material package ceramic core, such as the pottery of gas turbine turbine hollow blade
Porcelain shell is exactly to be realized in a manner of " ceramic core+medium temperature wax wax-pattern ".
In the ceramic shell technique of " ceramic core+medium temperature wax wax-pattern ", because the brittleness of ceramic core is higher, in addition its with
The difference in material properties of medium temperature wax wax-pattern, there are following technical problem underlyings：
1. the brittleness of ceramic core is higher, when medium temperature wax wax-pattern is suppressed, ceramic core usually easily occurs due to toughness is inadequate
Phenomenon of rupture, this is especially hollow with the more gas turbine turbine hollow blade of complicated, weak part and aero-engine
The ceramic core of the essence castings such as turbo blade is the most obvious；
2. after the completion of the compacting of medium temperature wax wax-pattern, due to the difference in material properties between wax-pattern and ceramic core, the two is caused to combine
It is defective tightness, stabilization, reliable, easily make segregation phenomenon occurs between wax-pattern and ceramic core, this can be to made ceramic shell
Cavity precision impacts, and then influences the Forming Quality for the hollow casting cast with this ceramic shell；
3. when ceramic shell dewaxes, since the stress generated during medium temperature wax wax-pattern melting dilation in shell is bigger, so as to
Ceramic core can be made to bear larger stress, easily crack the weak part of ceramic core, likewise, this is especially with knot
The pottery of the essence castings such as structure is complicated, weak part is more gas turbine turbine hollow blade and aero-engine hollow turbine vane
Porcelain core is the most obvious, and the crackle generation on ceramic core can be directly influenced with the shaping of this hollow casting cast
Quality.
All the time, the ceramic core forming technique of investment pattern precision casting is height confidential technique in the industry, fresh to be disclosed less,
In disclosed prior art, have no related pre- in advance how to be carried out during medium temperature wax pressing hollow casting wax mould to ceramic core
The technology of processing is disclosed.That is, in disclosed prior art, lack and solve the effective of above-mentioned technical problem
Technical measures.
The content of the invention
The technical purpose of the present invention is：For above-mentioned technical problem and the state of the art, independent research one kind can be effective
It reduces ceramic core brittleness and improves its toughness, improves compactness and stability, drop that ceramic core is combined with medium temperature wax wax-pattern
Ceramic core bears the ceramic core processing method of medium temperature wax stress during low dewaxing, i.e., in hollow casting precision-investment casting with
The preprocess method of the ceramic core of the waxed standby ceramic shell of medium temperature.
The present invention realizes its technical purpose the technical scheme adopted is that a kind of medium temperature wax precision-investment casting ceramic mould
Core preprocess method, the preprocess method comprise the following steps：
The ceramic core that step 1. will act as medium temperature wax precision-investment casting is immersed in paraffin water-in-oil emulsion, carries out impregnation,
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core；
Processing is dried in the ceramic core impregnated by step 2., and dried ceramic core is used as suppressing wax with medium temperature wax
Mould.
One of preferably, the paraffin melting point in the paraffin water-in-oil emulsion is up to 58 DEG C, the paraffin water and milk
The concentration for changing liquid is 5~20%.
One of preferably, the time of the impregnation is 3~30 minutes.
One of preferably, the impregnation is to carry out under vacuum conditions.
One of preferably, the drying process be the ceramic core that will impregnate temperature for 23 DEG C ~（Paraffin melts
- 5 DEG C of point）, humidity be 35~60% environmental condition under be dried.Further, when the drying time is 3~24 small, with
Mass change of the ceramic core between adjacent weighing twice after dipping is not higher than the paraffin water emulsification immersed in ceramic core
Until the 3% of liquid.Further, when the interval drying time between the weighing adjacent twice is 2 small.
One of preferably, the ceramic core is gas turbine turbine hollow blade or aero-engine hollow vortex
The ceramic core of impeller blade precision-investment casting.
It is cast the method have the benefit that the preprocess method of above-mentioned ceramic core is directed to medium temperature wax pressing hollow
The wax-pattern of part and design, by medium temperature wax wax-pattern suppress before ceramic core carry out with the impregnation of paraffin water-in-oil emulsion
And drying process, make to penetrate into paraffin in the stomata of ceramic core and form corresponding paraffin layer on the surface of ceramic core, with this
It can realize following major technique effect：
On the one hand, the brittleness of ceramic core can be effectively reduced and improves its toughness, make ceramic core in medium temperature wax wax-pattern
Good structural stress is kept in pressing process, efficiently reduces ceramic core because of the toughness in medium temperature wax wax-pattern pressing process not
The technical issues of being enough broken；
In another aspect, the paraffin layer on ceramic core surface is closely adhered on pottery in a manner of penetrating into ceramic core pore interior
The surface of porcelain core simultaneously because the similitude of paraffin and medium temperature wax property, can make the medium temperature wax wax-pattern and ceramic mould of compacting
The surface paraffin layer of core closely combines, and therefore, the paraffin layer on ceramic core surface, which is used as, combines carrier by ceramic core in
Warm wax wax-pattern realizes close, stable, reliable combination, so as to be effectively prevented suppressed medium temperature wax wax-pattern and ceramic core
Separation is led to the problem of between surface；
On the other hand, when ceramic shell dewaxes, since the melting point of paraffin wax on ceramic core surface will be less than medium temperature wax wax-pattern
Fusing point, and applied stress caused by the expansion of paraffin melted by heat will also be less than caused by the expansion of medium temperature wax wax-pattern melted by heat
Applied stress acts on the stress on ceramic core so as to being effectively reduced medium temperature wax due to melted by heat expands, and then
Ceramic core weak part is efficiently reduced because of the technical issues of bearing crackle caused by larger stress.
In conclusion the present invention can either be effectively reduced the brittleness of ceramic core and improve its toughness, and can be effective
Improve being tightly combined property, stability and the reliability of ceramic core and medium temperature wax wax-pattern in ground, additionally it is possible to when being effectively reduced dewaxing
Ceramic core bear the applied stress of medium temperature wax, so as to advantageously reduce the shaping difficulty of hollow casting ceramic shell, also
Be conducive to the Forming Quality of raising hollow casting ceramic shell, there is easy, simple, economic, reliable, practicality, originally
Invent particularly suitable gas turbine turbine hollow blade complicated, weak part is more or the hollow turbine leaf of aero-engine
The pretreatment of the ceramic core of the precision-investment casting of the hollow castings such as piece.
Specific embodiment
The present invention relates to investment precision casting technologies, are specifically a kind of ceramic core of medium temperature wax precision-investment casting
Preprocess method, the hollow castings such as its particularly suitable gas turbine turbine hollow blade or aero-engine hollow turbine vane
Precision-investment casting.Below with multiple embodiments to the present invention technology contents carry out in detail, clearly demonstrate.
Embodiment 1
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 58 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 15%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which is to carry out under vacuum conditions, and the time of impregnation is 5 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 40% for 35 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 2
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 52 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 5%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which is to carry out under vacuum conditions, and the time of impregnation is 10 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 60% for 45 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 3
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 56 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 20%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which carried out under normal pressure state, and the time of impregnation is 30 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 35% for 45 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 4
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 58 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 10%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which carried out under normal pressure state, and the time of impregnation is 20 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 40% for 25 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 5
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 58 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 8%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which is to carry out under vacuum conditions, and the time of impregnation is 3 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 50% for 35 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 6
The present invention for gas turbine turbine hollow blade in precision-investment casting, with the ceramics of the waxed standby ceramic shell of medium temperature
The preprocess method of core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 58 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 12%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which carried out under normal pressure state, and the time of impregnation is 15 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 40% for 40 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Embodiment 7
The present invention for aero-engine hollow turbine vane in precision-investment casting, with the pottery of the waxed standby ceramic shell of medium temperature
The preprocess method of porcelain core, comprises the following steps：
Step 1. prepares paraffin water-in-oil emulsion, and the paraffin melting point in the paraffin water-in-oil emulsion is 58 DEG C, paraffin water-in-oil emulsion it is dense
It spends for 18%；
The ceramic core that will act as medium temperature wax precision-investment casting is immersed in prepared paraffin water-in-oil emulsion, is carried out at dipping
Reason, which is to carry out under vacuum conditions, and the time of impregnation is 7 minutes；
Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core, stone
Wax forms corresponding paraffin layer on the surface of ceramic core；
Processing is dried in the ceramic core impregnated by step 2., which is the ceramic core that will have been impregnated in temperature
It spends under the environmental condition for being 35% for 35 DEG C, humidity and is dried, when drying time is 3~24 small, with the ceramic core after dipping
Until mass change between adjacent weighing twice is not higher than immerse the paraffin water-in-oil emulsion in ceramic core 3%, wherein,
The quality of the paraffin wax water-in-oil emulsion immersed in ceramic core immerses front and rear weighing with ceramic core and is calculated, and two after dipping
When interval drying time between secondary adjacent weighing is 2 small；
Dried ceramic core is used as suppressing wax-pattern with medium temperature wax.
Various embodiments above is only to illustrate the present invention, rather than its limitations；Although with reference to the various embodiments described above to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：The present invention still can be to the various embodiments described above
In specific technical solution modify either to which part technical characteristic carry out equivalent substitution and these modification or replace
It changes, the essence of appropriate technical solution is not made to depart from the spirit and scope of the present invention.
Claims (8)
- A kind of 1. medium temperature wax precision-investment casting ceramic core preprocess method, which is characterized in that the preprocess method bag Include the following steps：The ceramic core that step 1. will act as medium temperature wax precision-investment casting is immersed in paraffin water-in-oil emulsion, carries out impregnation, Paraffin is made to penetrate into the stomata of ceramic core, until there is no bubbles in paraffin water-in-oil emulsion to emerge for ceramic core；Processing is dried in the ceramic core impregnated by step 2., and dried ceramic core is used as suppressing wax with medium temperature wax Mould.
- 2. medium temperature wax precision-investment casting ceramic core preprocess method according to claim 1, which is characterized in that described Paraffin melting point in paraffin water-in-oil emulsion is up to 58 DEG C, and the concentration of the paraffin water-in-oil emulsion is 5~20%.
- 3. medium temperature wax precision-investment casting ceramic core preprocess method according to claim 1, which is characterized in that described The time of impregnation is 3~30 minutes.
- 4. according to the medium temperature wax precision-investment casting ceramic core preprocess method of claim 1 or 3, which is characterized in that The impregnation is to carry out under vacuum conditions.
- 5. medium temperature wax precision-investment casting ceramic core preprocess method according to claim 1, which is characterized in that described Drying process be the ceramic core that will impregnate temperature for 23 DEG C ~（- 5 DEG C of paraffin melting point）, humidity be 35~60% environment item It is dried under part.
- 6. according to the medium temperature wax precision-investment casting ceramic core preprocess method of claim 1 or 5, which is characterized in that When the drying time is 3~24 small, it is not higher than with mass change of the ceramic core after dipping between adjacent weighing twice Until immerse the paraffin water-in-oil emulsion in ceramic core 3%.
- 7. medium temperature wax precision-investment casting ceramic core preprocess method according to claim 6, which is characterized in that described When the interval drying time between adjacent weighing is 2 small twice.
- 8. medium temperature wax precision-investment casting ceramic core preprocess method according to claim 1, which is characterized in that described Ceramic core is gas turbine turbine hollow blade or the ceramic mould of aero-engine hollow turbine vane precision-investment casting Core.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109175305A (en) * | 2018-10-12 | 2019-01-11 | 珠海格力电器股份有限公司 | Impeller casting process and impeller |
| CN113939375A (en) * | 2019-06-05 | 2022-01-14 | 赛峰集团 | Improved method of forming wax patterns for turbine blades |
| CN114728854A (en) * | 2019-09-30 | 2022-07-08 | 康宁股份有限公司 | Manufacture of flow reactor modules and modules produced thereby |
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| CN113939375A (en) * | 2019-06-05 | 2022-01-14 | 赛峰集团 | Improved method of forming wax patterns for turbine blades |
| CN114728854A (en) * | 2019-09-30 | 2022-07-08 | 康宁股份有限公司 | Manufacture of flow reactor modules and modules produced thereby |
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