CN205200508U - Directional crystallization heat -proof device and have its directional crystallization stove for - Google Patents
Directional crystallization heat -proof device and have its directional crystallization stove for Download PDFInfo
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- CN205200508U CN205200508U CN201520924102.2U CN201520924102U CN205200508U CN 205200508 U CN205200508 U CN 205200508U CN 201520924102 U CN201520924102 U CN 201520924102U CN 205200508 U CN205200508 U CN 205200508U
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Abstract
The utility model discloses a directional crystallization heat -proof device and have its directional crystallization stove for, this heat -proof device are located between heat preservation device and the cooling device of directional crystallization stove and the cover is located outside the directional mould shell for axial along directional mould shell forms adiabatic district, the heat -proof device adopts polycrystal mullite fibre to make, and the whole ring form that is of heat -proof device. The utility model discloses an adopt the annular heat -proof device of polycrystal mullite fibre rounding, because the fibrous coefficient of heat conductivity of polycrystal mullite far is less than graphite or uralite, make the thermal -insulated effectual of this heat -proof device, the axial -temperature gradient of directional crystallization stove has effectively been improved, and thermal baffles is reducible in order to reduce the distance between the zone of heating and the cooling space along axial thickness, further improve axial -temperature gradient, and then the grain size qualification rate of directional blade has been improved, and the annular boss through setting up protective, with the closed potential safety hazard that forms the short circuit and exist of heater when avoiding mould shell bleed -out.
Description
Technical field
The utility model relates to hot investment casting field, especially, relates to a kind of directional crystallization furnace heat-proof device and has its directional crystallization furnace.
Background technology
20 century 70 mid-terms, American and Britain, Deng developed country first by directional columnargrain blade technology for the production of, owing to eliminating transverse grain boundaries, crystal is produced along specific direction, directional columnargrain blade is compared with traditional equiax crystal blade, performance, life-span and serviceability temperature can be increased substantially, become the important directions of aero-engine research and development.
At present, industrial the most ripe, common method for the production of directional columnargrain blade is rapid solidification method (HRS), i.e. casting mold Mobile Method, the type directional crystallization furnace insulated device (thermal baffle) is divided into three regions: the thermal treatment zone, adiabatic region, cooling zone.Thermal baffle is absolutely necessary for control directional crystallization, affects axial-temperature gradient to a great extent, and then affects the quality of directional columnargrain tissue, very high to material, structure and dimensional requirement.
Existing thermal baffle material is generally graphite or uralite, and size generally customizes according to stove demand.But because graphite, uralite thermal conductivity factor are larger, adding the design of thermal baffle thickness, unreasonable (the too thin then effect of heat insulation of thickness is bad, reduce thermograde, and thermal insulation board intensity can be caused not enough, the too thick distance then increased between the thermal treatment zone and cooling zone, in a disguised form reduces thermograde again), cause effect of heat insulation bad, thermograde cannot effectively be ensured, directional columnargrain is organized bad; In addition, once formwork bleed-out, molten steel easily and heater is closed forms short circuit, there is very large potential safety hazard.
Utility model content
The utility model provides a kind of directional crystallization furnace heat-proof device and has its directional crystallization furnace, and the axial-temperature gradient caused to solve existing heat-proof device effect of heat insulation difference is difficult to the technical problem effectively ensured.
The technical solution adopted in the utility model is as follows:
According to an aspect of the present utility model, a kind of directional crystallization furnace heat-proof device is provided, be sheathed on and cast outside the directed formwork of core as crystallographic orientation between the attemperator and cooling device of directional crystallization furnace, form adiabatic region for the axis along directed formwork; Heat-proof device adopts polycrystalline mullite fibre to make, and heat-proof device entirety is in circular.
Further, the upper surface of heat-proof device is convexly equipped with the annular boss of the heating means touch in liquid metal for preventing directed formwork excessive and directional crystallization furnace, the thickness of annular boss be less than heat-proof device thickness radially and annular boss between the outside wall surface and internal face of heat-proof device.
Further, the inner edge, lower surface of heat-proof device is provided with hypotenuse chamfering.
Further, heat-proof device is 30 ~ 40mm along the thickness of its axis.
According to another aspect of the present utility model, provide a kind of directional crystallization furnace, comprise above-mentioned directional crystallization furnace heat-proof device.
Further, directional crystallization furnace comprises attemperator, in attemperator, heater is set, the bottom of attemperator is provided with thermal baffle, cooling device is arranged at intervals with below thermal baffle, directed formwork as the casting core of crystallographic orientation moves up and down freely between heater, thermal baffle and cooling device, to realize crystallographic orientation.
Further, attemperator adopts double-deck barrel-like structure, comprises the inner heat-insulating barrel being positioned at inner side, the insulation outer barrel being positioned at outside, and insulation outer barrel adopts solid carbon felt one-body molded and is sheathed on outside inner heat-insulating barrel.
Further, heater comprises and is positioned at inner heat-insulating barrel and the upper heater arranged along its axially spaced-apart and lower heater.
The utility model has following beneficial effect:
The utility model directional crystallization furnace heat-proof device and there is its directional crystallization furnace, circular heat-proof device is made by adopting polycrystalline mullite fibre, because the thermal conductivity factor of polycrystalline mullite fibre is much smaller than graphite or uralite, make the good heat-insulation effect of this heat-proof device, effectively improve the axial-temperature gradient of directional crystallization furnace, and thermal baffle thickness vertically can reduce the distance that reduces between the thermal treatment zone and cooling zone, further raising axial-temperature gradient, and then the grain size qualification rate that improve directional vane.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model preferred embodiment heat-proof device;
Fig. 2 is the structural representation of the utility model preferred embodiment directional crystallization furnace;
Fig. 3 is preferred embodiment of the present invention directional crystallization schematic diagram.
Description of reference numerals:
1, attemperator;
2, directed formwork; 3, heater; 4, cooling device; 5, heat-proof device;
31, upper heater; 32, lower heater;
51, annular boss; 52, hypotenuse chamfering;
6, liquid metal; 7, solid metallic.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
With reference to Fig. 1 and Fig. 2, preferred embodiment of the present utility model provides a kind of directional crystallization furnace heat-proof device, between the attemperator 1 and cooling device 4 of directional crystallization furnace and be sheathed on cast core as crystallographic orientation directed formwork 2 outside, for along directed formwork 2 axis formed adiabatic region; The present embodiment heat-proof device 5 adopts polycrystalline mullite fibre to make, and heat-proof device 5 entirety is in circular.
Empirical tests, 1500 DEG C time, the thermal conductivity factor of polycrystalline mullite fibre is not more than 0.25W/m.K, be only 0.05 times of graphite heat conducting coefficient (5-20W/m.K), the thermal baffle dispersed heat made by polycrystalline mullite fibre is in theory only 0.05 times of graphite thermal baffle, good heat-insulation effect, effectively can improve the axial-temperature gradient of directional crystallization furnace.The present embodiment, preferably, considers and changes on effect of heat insulation is good after material basis, change heat-proof device 5 thickness L vertically into 30 ~ 40mm, reduce the distance between the thermal treatment zone and cooling zone, effectively can improve axial-temperature gradient by original 50mm.
Alternatively, with reference to Fig. 1, inside heat-proof device 5 lower surface, design is the hypotenuse chamfering 52 of 45 DEG C, be equivalent to the thickness in a disguised form reducing heat-proof device 5, both ensured that heat-proof device 5 had enough intensity, again can in directional crystallization, directed formwork 2 moves to chamfering upper end, water-cooling ring below heat-proof device 5 just can participate in heat radiation fast, is conducive to improving thermograde.
Preferably, the upper surface of heat-proof device 5 is convexly equipped with the annular boss 51 for preventing the excessive liquid metal of directed formwork 2 from contacting with the heater 3 in directional crystallization furnace, the thickness of annular boss 51 be less than heat-proof device 5 thickness radially and annular boss 51 between the outside wall surface and internal face of heat-proof device 5.In the present embodiment, the annular boss of a wide 15mm, high 5mm is designed in heat-proof device 5 upper surface, once directed formwork 2 bleed-out, the heat-proof device zone freezing of molten steel in annular boss or flow into formwork room from the fit-up gap of heat-proof device and cooling device 4, effectively avoid steel flow to solidify outside heat-proof device 5 and cause the short circuit of lower heater 3, thus when effectively prevent directed formwork 2 bleed-out and heater 3 is closed forms short circuit and the potential safety hazard that exists.
According to another aspect of the present utility model, provide a kind of directional crystallization furnace, comprise the directional crystallization furnace heat-proof device 5 of above-described embodiment.With reference to Fig. 2, in the present embodiment directional crystallization furnace, heater 3 is set in attemperator 1, the bottom of attemperator 1 is provided with thermal baffle 5, cooling device 4 is arranged at intervals with below thermal baffle 5, as the directed formwork 2 of the casting core of crystallographic orientation, can move up and down freely between heater 3, thermal baffle 5 and cooling device 4 vertically, to realize crystallographic orientation.Heat-proof device 5 forms thermal treatment zone A, adiabatic region B, cooling zone C (with reference to Fig. 3) along the axis of crystal growing furnace.Liquid metal 6 enters along the entrance of directional crystallization furnace and flows in directed formwork 2, crystallographic orientation furnace interior forms axial temperature field, and form solid liquid interface near adiabatic region B correspondence position, and liquid metal 6 in directed formwork 2 is frozen into solid metallic 7 under the effect of cooling device 4 and water mold.
Preferably, heater 3 comprises and is positioned at inner heat-insulating barrel 11 and the upper heater 31 arranged along its axially spaced-apart and lower heater 32, to be formed in crystal growing furnace effectively and uniform heating field.
The present embodiment attemperator 1 preferably adopts double-deck barrel-like structure, comprises the inner heat-insulating barrel being positioned at inner side, the insulation outer barrel being positioned at outside, and insulation outer barrel adopts solid carbon felt one-body molded and is sheathed on outside inner heat-insulating barrel.
Empirical tests, 1500 DEG C time, solid carbon felt thermal conductivity factor (0.2-0.27W/m
2. DEG C) be only soft felt thermal conductivity factor (20-25W/m
2. DEG C) 0.01 times, therefore adopt to be only traditional soft felt heat-preserving container by the insulation outer barrel dispersed heat in theory of solid carbon felt global formation 0.01 times, significantly reduce radial temperature and run off, ensure the uniformity in temperature field, thus ensure thermograde.And traditional craft is tied up the several layers of insulation outer barrel made due to the space between binding layer and also caused heat radiation serious, and then cause in-furnace temperature uneven, affect directional columnargrain institutional framework, and service life is short, needs frequent replacing affect production efficiency.Therefore the integrated insulation outer barrel of the present embodiment solid carbon felt not only significantly reduces the overall temperature leak radially of attemperator, improve thermograde, thus obtain good directional columnargrain tissue, also can extend the service life of attemperator, effective minimizing replacement frequency, improves the production efficiency of crystal growing furnace.
In the present embodiment, preferably, outer barrel and inner heat-insulating barrel matched in clearance is incubated.Integrated insulation outer barrel 12 is sheathed on inner heat-insulating barrel 11 outside, makes attemperator be convenient to independent processing, and the loading, unloading of convenient peace and maintenance.
In the present embodiment, preferably, inner heat-insulating barrel comprises tubular interior bucket staving, and the top of interior bucket staving is provided with interior bucket bung, and the periphery lower surface of interior bucket bung is arranged with the recessed edge of annular coordinated with the top of interior bucket staving.More preferably, interior bucket staving and interior bucket bung adopt graphite to make.
Can learn from above description, the present embodiment makes circular heat-proof device by adopting polycrystalline mullite fibre, because the thermal conductivity factor of polycrystalline mullite fibre is much smaller than graphite or uralite, make the good heat-insulation effect of this heat-proof device, effectively improve the axial-temperature gradient of directional crystallization furnace, and thermal baffle thickness vertically can reduce the distance that reduces between the thermal treatment zone and cooling zone, further raising axial-temperature gradient, and then the grain size qualification rate that improve directional vane.And by heat-proof device upper surface projection annular boss thus when effectively prevent directed formwork bleed-out and heater close and form short circuit and the potential safety hazard that exists.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. a directional crystallization furnace heat-proof device, being positioned between the attemperator (1) of directional crystallization furnace and cooling device (4) and being sheathed on casts outside the directed formwork (2) of core as crystallographic orientation, forms adiabatic region for the axis along described directed formwork (2); It is characterized in that, described heat-proof device (5) adopts polycrystalline mullite fibre to make, and described heat-proof device (5) entirety is in circular.
2. directional crystallization furnace heat-proof device according to claim 1, is characterized in that,
The upper surface of described heat-proof device (5) is convexly equipped with the annular boss (51) for preventing the excessive liquid metal of described directed formwork (2) from contacting with the heater (3) in directional crystallization furnace, and the thickness of described annular boss (51) is less than described heat-proof device (5) thickness radially and between described annular boss (51) outside wall surface that is positioned at described heat-proof device (5) and internal face.
3. directional crystallization furnace heat-proof device (5) according to claim 2, is characterized in that,
The inner edge, lower surface of described heat-proof device (5) is provided with hypotenuse chamfering (52).
4. directional crystallization furnace heat-proof device (5) according to claim 3, is characterized in that,
Described heat-proof device (5) is 30 ~ 40mm along the thickness of its axis.
5. a directional crystallization furnace, is characterized in that, comprise as arbitrary in Claims 1-4 as described in directional crystallization furnace heat-proof device (5).
6. directional crystallization furnace according to claim 5, is characterized in that,
Described directional crystallization furnace comprises attemperator (1), heater (3) is set in described attemperator (1), the bottom of attemperator (1) is provided with thermal baffle (5), cooling device (4) is arranged at intervals with below described thermal baffle (5), directed formwork (2) as the casting core of crystallographic orientation moves up and down freely, to realize crystallographic orientation between described heater (3), described thermal baffle (5) and described cooling device (4).
7. directional crystallization furnace according to claim 6, is characterized in that,
Described attemperator (1) adopts double-deck barrel-like structure, comprises the inner heat-insulating barrel being positioned at inner side, the insulation outer barrel being positioned at outside, and described insulation outer barrel adopts solid carbon felt one-body molded and is sheathed on outside described inner heat-insulating barrel.
8. directional crystallization furnace according to claim 7, is characterized in that,
Described heater (3) comprises and is positioned at described inner heat-insulating barrel and the upper heater (31) arranged along its axially spaced-apart and lower heater (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520924102.2U CN205200508U (en) | 2015-11-18 | 2015-11-18 | Directional crystallization heat -proof device and have its directional crystallization stove for |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520924102.2U CN205200508U (en) | 2015-11-18 | 2015-11-18 | Directional crystallization heat -proof device and have its directional crystallization stove for |
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| CN205200508U true CN205200508U (en) | 2016-05-04 |
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ID=55838249
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107983938A (en) * | 2017-12-06 | 2018-05-04 | 安徽应流航源动力科技有限公司 | A kind of insulation crystal pulling special purpose device |
| CN109355697A (en) * | 2018-11-27 | 2019-02-19 | 沈阳航发精密铸造有限公司 | A kind of crystallographic orientation furnace temperature thermal baffle |
| CN112461000A (en) * | 2020-11-25 | 2021-03-09 | 浙江炜烨晶体纤维有限公司 | Heat insulation device for directional crystallization furnace based on polycrystalline mullite fiber |
-
2015
- 2015-11-18 CN CN201520924102.2U patent/CN205200508U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107983938A (en) * | 2017-12-06 | 2018-05-04 | 安徽应流航源动力科技有限公司 | A kind of insulation crystal pulling special purpose device |
| CN109355697A (en) * | 2018-11-27 | 2019-02-19 | 沈阳航发精密铸造有限公司 | A kind of crystallographic orientation furnace temperature thermal baffle |
| CN112461000A (en) * | 2020-11-25 | 2021-03-09 | 浙江炜烨晶体纤维有限公司 | Heat insulation device for directional crystallization furnace based on polycrystalline mullite fiber |
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| TR01 | Transfer of patent right |
Effective date of registration: 20190701 Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: Zhuzhou Air China power precision is cast with limit company |