CN210065976U - Gas-liquid double-medium cooling crystallization ring for directional/single crystal vacuum furnace - Google Patents
Gas-liquid double-medium cooling crystallization ring for directional/single crystal vacuum furnace Download PDFInfo
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- CN210065976U CN210065976U CN201920453603.5U CN201920453603U CN210065976U CN 210065976 U CN210065976 U CN 210065976U CN 201920453603 U CN201920453603 U CN 201920453603U CN 210065976 U CN210065976 U CN 210065976U
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Abstract
The utility model provides a gas-liquid double-medium cooling crystallization ring for a directional/single crystal vacuum furnace, which comprises a water cooling ring and an air cooling ring; the air cooling ring is arranged above the water cooling ring; the water cooling ring comprises a water cooling ring body and a water cooling pipeline, and is connected with a water cooling system of the vacuum furnace through the water cooling pipeline; the gas cooling ring comprises a gas cooling ring body, a gas cooling spray ring arranged on the ring body and a gas cooling pipeline, the gas cooling ring is connected with an inert gas generating device through the gas cooling pipeline, and the inert gas is sprayed onto the formwork through the spray ring. The crystallization ring is arranged in a cooling device of a vacuum furnace, can enhance the integral cooling strength in the process of directional solidification and single crystal production, improves the temperature gradient, increases the cooling rate and improves the quality and the performance of a single crystal blade.
Description
Technical Field
The utility model belongs to the single crystal/directional vacuum precision casting field, which is mainly applied to the production of single crystal/directional blades of aerospace engines and gas turbines; in particular to a gas-liquid dual-medium cooling crystallization ring for a directional/single crystal vacuum furnace.
Background
Turbine blades are important hot parts of aircraft engines and gas turbines, and are subjected to very large temperature loads and stress loads. The high-temperature alloy blade manufactured by the precision casting process in the early stage is of an isometric crystal structure, and a tissue matrix is cut by disordered crystal boundaries. The grain boundaries are weak parts under the high-temperature stress condition, so that the performance of the blade is seriously weakened. The successful development of the single crystal directional solidification casting technology is an important breakthrough for improving the thermal strength of the turbine blade. First, the single crystal blade eliminates all grain boundaries and has no area that is most vulnerable to damage when subjected to high temperature creep and thermal fatigue stresses; second, the single crystal has an optimum crystallographic orientation that is matched to the axial and azimuthal stress vectors. At present, single crystal blades have been widely used in aircraft engines and gas turbines.
During directional/single crystal solidification, the overheated alloy melt is poured into the mold shell, the alloy melt layer close to the surface of the water-cooled disc is rapidly cooled to be below the crystallization temperature to start crystallization, and the crystal grains formed at the moment are disordered in orientation. In the subsequent solidification process, because the heat flow is radiated downwards in a single direction through the crystallized solid metal, the crystallization front is a positive temperature gradient, the crystal <001> in the crystallization process of the alloy is in a preferred orientation, the growth speed is fastest, and therefore, the crystal grains with the <001> direction grow preferentially, and the crystal grains in other directions are eliminated. As long as the above directional solidification conditions are maintained, columnar crystals oriented <001> can be kept growing until the entire blade, forming a columnar crystal structure.
When the directional crystallization is carried out, the directionally solidified crystalline structure has a close relationship with the temperature gradient G and the solidification rate R. The temperature gradient refers to the change of the temperature of the front edge of the solidification interface along with the distance, a coarse dendritic structure can be formed by a low-temperature gradient process, and the local segregation is serious; the high temperature gradient crystallization can lead the feeding of the alloy casting to be better, the looseness to be less and the structure to be more compact. Thereby improving the service performance.
When a water-cooled copper plate is adopted for crystallization, the heat dissipation of the mould shell mainly depends on a water-cooled ring and a water-cooled crystallization disc; the water cooling ring realizes radial heat dissipation of the formwork, and the water cooling crystallization disc realizes axial heat dissipation of the formwork. The heat dissipation mode is radiation heat dissipation and conduction heat dissipation. Under the high vacuum state, the radiation heat dissipation coefficient and the conduction heat dissipation coefficient are both very low, so that the temperature gradient of the water-cooled copper plate for crystallization is only about 20 ℃/cm when the directional crystallization is carried out. At present, water-cooled copper plate crystallization with low temperature gradient is generally adopted in Europe, America and China, and in the process of directional solidification of alloy, particularly when large-size alloy parts are prepared, the conditions of low temperature gradient, nonuniform heating of all parts of the alloy parts and the like exist, so that the generation of single crystal solidification defects such as mixed crystals and the like when the alloy is prepared by adopting a directional solidification process is caused, and the quality of the alloy is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior low temperature gradient crystallization technology, improve the temperature gradient of a solid/liquid interface and the cooling rate of a casting when a large-size directional alloy or single crystal alloy part grows and provide a gas and liquid dual-medium cooling crystallization ring for a directional/single crystal vacuum furnace. The device introduces gas convection heat dissipation and water cooling into the directional solidification equipment while the directional solidification furnace generates radiation heat dissipation and conduction heat dissipation so as to improve the temperature gradient and the cooling rate of a casting, effectively reduce the generation of defects such as mixed crystals and the like during alloy preparation and improve the quality and the performance of the directional/single crystal blade.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a gas-liquid double-medium cooling crystallization ring for a directional/single crystal vacuum furnace is characterized in that,
the crystallization ring comprises a water cooling ring and an air cooling ring;
the air cooling ring is arranged above the water cooling ring;
the water cooling ring comprises a water cooling ring body and a water cooling pipeline, and is connected with a water cooling system of the vacuum furnace through the water cooling pipeline;
the air cooling ring comprises an air cooling ring body, an air cooling spray ring and an air cooling pipeline which are arranged on the ring body,
the gas cooling ring is connected with an inert gas generating device through a gas cooling pipeline, and the inert gas is sprayed onto the formwork through the spraying ring.
In order to improve the technical proposal, the device comprises a shell,
the gas-cooled spraying rings are circumferentially distributed along the inner side of the gas-cooled ring body, and the direction flow and the pressure of gas sprayed by the gas-cooled spraying rings are adjustable.
In order to improve the technical proposal, the device comprises a shell,
the water cooling ring and the air cooling ring are made of the same material, are made of red copper or stainless steel materials and are arranged below the formwork heater.
The beneficial effects of the utility model reside in that:
the utility model discloses a set up gas, two medium cooling device of water bottom the mould shell heater at directional single crystal vacuum furnace, can strengthen the whole cooling strength in directional solidification and the single crystal production process, improve temperature gradient, increase cooling rate improves the quality and the performance of single crystal blade. Realizing rapid and efficient directional solidification and single crystal growth.
Drawings
FIG. 1 is a schematic diagram of the position of the device of the present invention on a directional/single crystal vacuum furnace.
FIG. 2 is a schematic view of the structure of the gas-liquid dual-medium cooling crystallization ring for the directional/single crystal vacuum furnace of the present invention.
Wherein: 1. a water-cooled ring body; 2. an air-cooled ring body; 3. spraying rings; 4. a water-cooling pipeline; 5. an air cooling pipeline; 6. water-cooling the crystallization tray; 7. an upper mold shell heater; 8. a lower mold shell heater; 9. a heat insulation baffle; 10. a leaf liquid phase portion; 11. leaf solid phase part.
Detailed Description
The invention is further described with reference to the following specific drawings and examples.
As shown in fig. 1: referring to fig. 1-2, to achieve the above object, the present invention provides the following technical solutions:
a gas-liquid double-medium cooling crystallization ring for a directional/single crystal vacuum furnace is characterized in that,
the crystallization ring comprises a water cooling ring and an air cooling ring;
the air cooling ring is arranged above the water cooling ring;
the water cooling ring comprises a water cooling ring body 1 and a water cooling pipeline 4, and is connected with a water cooling system of the vacuum furnace through the water cooling pipeline 4; and cooling the mold shell and the alloy in the mold shell.
The air cooling ring comprises an air cooling ring body 2, an air cooling spray ring 3 and an air cooling pipeline 5 which are arranged on the ring body,
the gas cooling ring is connected with an inert gas generating device through a gas cooling pipeline 5, and the inert gas is sprayed onto the formwork through a spraying ring 3.
In order to improve the technical proposal, the device comprises a shell,
the air-cooled spray rings 3 are circumferentially distributed along the inner side of the air-cooled ring body 2, and the direction flow and the pressure of the gas sprayed by the air-cooled spray rings 3 are adjustable.
In order to improve the technical proposal, the device comprises a shell,
the water cooling ring and the air cooling ring are made of the same material, are made of red copper or stainless steel materials and are arranged below the formwork heater.
The device is adopted to prepare the single crystal blade and is fixed below the directional/single crystal vacuum furnace mould shell heater. The direction of the gas sprayed by the spray ring is adjusted according to the requirement. When the single crystal/directional high-temperature alloy blade is precisely cast, the mold shell is lifted into the mold shell induction heater, the mold shell induction heater heats the mold shell according to the set temperature rising curve to reach the final set temperature (the temperature exceeds the melting point of the alloy), and the temperature is preserved. Adding the single crystal mother alloy into the induction melting crucible for secondary remelting, pouring alloy liquid in the crucible into a mould shell after the remelting is finished, and downwards pulling the single crystal/directional high-temperature alloy blade by the mould shell according to a set pulling speed. The directional/single crystal vacuum furnace mould shell heater is divided into an upper mould shell heater 7 and a lower mould shell heater 8, the mould shell heater and the gas and water cooling crystallization rings are separated by a heat insulation baffle 9, and the mould shell is placed on the water cooling crystallization disc 6. When the shuttering is drawn downwards, alloy liquid (blade liquid phase part 10) is in the shuttering when passing through the shuttering heater, and when the alloy liquid passes through the gas and water cooling crystallization ring, the shuttering dissipates heat and the alloy is solidified (blade solid phase part 11).
The utility model discloses let in inert gas and cooling water in the device and cool off the die shell to the cooling strength that the reinforcing single crystal was grown improves temperature gradient, and increase cooling rate, thereby can reduce the production of single crystal casting defects such as miscellaneous crystal effectively, improves the quality and the performance of single crystal blade.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (3)
1. A gas-liquid double-medium cooling crystallization ring for a directional/single crystal vacuum furnace is characterized in that,
the crystallization ring comprises a water cooling ring and an air cooling ring;
the air cooling ring is arranged above the water cooling ring;
the water cooling ring comprises a water cooling ring body (1) and a water cooling pipeline (4), and is connected with a water cooling system of the vacuum furnace through the water cooling pipeline (4);
the air cooling ring comprises an air cooling ring body (2), an air cooling spray ring (3) and an air cooling pipeline (5) which are arranged on the ring body,
the gas cooling ring is connected with an inert gas generating device through a gas cooling pipeline (5), and the inert gas is sprayed onto the formwork through the spraying ring (3).
2. The gas-liquid dual-medium cooling crystallization ring for the directional/single crystal vacuum furnace as claimed in claim 1, wherein: the gas-cooled spraying rings (3) are circumferentially distributed along the inner side of the gas-cooled ring body (2), and the direction flow and the pressure of gas sprayed by the gas-cooled spraying rings (3) are adjustable.
3. The gas-liquid dual-medium cooling crystallization ring for the directional/single crystal vacuum furnace as claimed in claim 1, wherein: the water cooling ring and the air cooling ring are made of the same material, are made of red copper or stainless steel materials and are arranged below the formwork heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920453603.5U CN210065976U (en) | 2019-04-04 | 2019-04-04 | Gas-liquid double-medium cooling crystallization ring for directional/single crystal vacuum furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920453603.5U CN210065976U (en) | 2019-04-04 | 2019-04-04 | Gas-liquid double-medium cooling crystallization ring for directional/single crystal vacuum furnace |
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| Publication Number | Publication Date |
|---|---|
| CN210065976U true CN210065976U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920453603.5U Active CN210065976U (en) | 2019-04-04 | 2019-04-04 | Gas-liquid double-medium cooling crystallization ring for directional/single crystal vacuum furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210065976U (en) |
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2019
- 2019-04-04 CN CN201920453603.5U patent/CN210065976U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214161 No. 11, Liulu Road, Hudai Town, Binhu District, Wuxi City, Jiangsu Province Patentee after: Jiangsu Yonghan special alloy technology Co.,Ltd. Address before: 214161 No. 11, Liulu Road, Hudai Town, Binhu District, Wuxi City, Jiangsu Province Patentee before: SUVAST SPEICAL ALLOY TECHNOLOGY CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A gas-liquid double medium cooling crystallization ring for directional / single crystal vacuum furnace Effective date of registration: 20220513 Granted publication date: 20200214 Pledgee: Jiangsu SINOSURE technology microfinance Co.,Ltd. Pledgor: Jiangsu Yonghan special alloy technology Co.,Ltd. Registration number: Y2022320000225 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |