CN207619552U - A kind of directional solidification furnace center heating and central cooling device - Google Patents
A kind of directional solidification furnace center heating and central cooling device Download PDFInfo
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- CN207619552U CN207619552U CN201721135075.6U CN201721135075U CN207619552U CN 207619552 U CN207619552 U CN 207619552U CN 201721135075 U CN201721135075 U CN 201721135075U CN 207619552 U CN207619552 U CN 207619552U
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- 238000001816 cooling Methods 0.000 title claims abstract description 97
- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
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- 230000008023 solidification Effects 0.000 title claims abstract description 58
- 239000013078 crystal Substances 0.000 claims abstract description 31
- 238000005266 casting Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
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- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
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- 239000010949 copper Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 7
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Abstract
The utility model discloses a kind of directional solidification furnace center heating and central cooling device, belong to high temperature alloy processing and manufacturing technology.The device is to increase central heating system and central cooling system in directional solidification furnace, improves the temperature gradient in high temperature alloy directional solidification process；Wherein：The central heating system includes tubular heater, which is set to the center axial position surrounded with multiple formworks that ring style arranges, to being heated on the inside of shell after energization；The central cooling system includes cylindrical metal tube, the middle position of water-cooled chassis is set to, by being passed through cooling water in cylindrical metal tube to being cooled down on the inside of shell；By increasing central heating system and central cooling system, realizes that the temperature gradient of crystal growth inside and outside directional solidification process medium casting is consistent, realize rapidly and efficiently directional solidification and crystal growth.The device is suitable for manufacture directional solidification and monocrystalline part.
Description
Technical field：
The utility model is related to high temperature alloy manufacturing technology fields, and in particular to a kind of directional solidification furnace heated with center and
Central cooling device is prepared for directional solidification and the directional solidification of single crystal super alloy.
Background technology：
It is well known that cast superalloy has the advantages that high intensity, high-fire resistance, with precision casting process and ceramics
The development of core technology has become modern aeroengine turbo blade and guide vane preferred material.Early stage accurate casting
It is equiaxed grain structure to make high-temperature alloy blades made of technique, and tissue matrix is cut by mixed and disorderly unordered crystal boundary.In long-term reality
In trampling, researcher has found that these crystal boundaries are weak part under high temperature stress condition, and Blade Properties is made seriously to be weakened；Blade
When fracture failure, crack propagation is often along the transverse grain boundaries perpendicular to Impact direction.Then directional solidification technique has been developed, has made
For directional columnargrain blade has been gone out, after eliminating the transverse grain boundaries vertical with the principal axes of stress, the performance of blade greatly improves.Into one
After the research of step finds crystallographic orientation, crackle primarily occur ins on longitudinal crystal boundary.Then monocrystalline directional solidification casting technology by with
The all grain boundaries in high-temperature alloy blades are eliminated, as a result realizes blade high-temperature behavior and further increases.Currently, monocrystalline leaf
Piece is not only mounted on various advanced aero engines already, has also been increasingly being used in heavy duty gas turbine.
Single crystal blade directional solidification furnace generally used now is as shown in Figure 1, including heating zone (area 3 and heating zone on heating zone
Lower area 4) and water-cooled chassis 6, heater used in heating zone is drum-shaped, by circumferential inside radial heat radiation come heat with
The formwork of ring style arrangement and its alloy melt of inside, when the downward pull of shell, by being alloy in shell when heating zone
Liquid (blade does not solidify part 1).It is separated by thermal baffle 5 between heating zone and water-cooled chassis 6.
In directional solidification process, when formwork drops to the cold-zone under thermal baffle 5, shell passes through outward to annular shape
6 heat loss through radiation of water-cooled chassis, make alloy melt coagulation forming (blade has solidified part 2).This furnace structure causes often
A blade inside and outside both sides it is heated and cooling serious asymmetric.Side (abbreviation sunny side) is direct in heating zone outwardly for each blade
In face of heater, and it is closer from heater, by effective radiant heating；The side is then directly facing water cooling when dropping to cooling zone
Ring, closer to water-cooling ring, thus can Net long wave radiation heat dissipation, material is thus formed higher temperature gradient and relatively narrow mushy zone,
Advantage is created for crystal growth.And blade inwardly side (the abbreviation back) then on the contrary, because back to heater in stove
It cannot directly radiate heated, annular arrangement formwork is made to be centrally formed the lower tubular shadow region of temperature；Side when dropping to cooling zone
It due to back to water-cooling ring, and farther from water-cooling ring, cannot cool down very well, original shadow region becomes the slow cooling of relative closure
Area, thus cooling rate and temperature gradient are obviously relatively low, as a result with regard to the dished freezing interface of shape and very wide mushy zone, monocrystalline
Tissue coagulation formation condition very severe, so that the single crystal castings defect such as stray crystal and freckle is easier in casting shadow region side
It is formed, this phenomenon is referred to as shadow effect.With the increase of blade dimensions, inside and outside blade between curing condition difference
Increase due to the increase of distance, thus shadow effect is more serious.
Utility model content：
The purpose of this utility model is to provide a kind of directional solidification furnace center heating and central cooling device, using this
Device can effectively eliminate the shadow effect in directional solidification and single crystal blade production process.
To achieve the above object, technical solution used by the utility model is as follows：
A kind of directional solidification furnace is heated with center and central cooling device, the device are to increase center in directional solidification furnace
Heating system and central cooling system improve the temperature gradient in high temperature alloy directional solidification process；Wherein：The center heating
System includes tubular heater, which is set to the center axial position surrounded with multiple formworks that ring style arranges,
To being heated on the inside of shell after energization；The central cooling system includes cylindrical metal tube, is set to the center of water-cooled chassis
Position, by being passed through cooling water in cylindrical metal tube to being cooled down on the inside of shell；By increase central heating system and
Central cooling system realizes that the temperature gradient of crystal growth inside and outside directional solidification process medium casting is consistent.
The central heating system further includes water cooling copper electrode and temperature thermocouple, and the water cooling copper electrode is sent out with tubular
Hot body top is connected, for drawing electricity；The temperature thermocouple is placed in inside tubular heater,
The tubular heater is isostatic pressing formed graphite or refractory metal material, and heating power is set according to heating region size
It is single-phase electrical gudie structure, heating voltage control is in 40V hereinafter, ensureing the steady operation under vacuum environment between 5-30kw；Cylinder
Shape heater concrete shape is determined according to Leaf positional distribution and concrete technology.
The water cooling copper electrode is copper pipe structure, and heat preservation is placed in working chamber as cantilever support by water cooling copper electrode
Bucket is internal, and it is in suspension method to make tubular heater.
The cylindrical metal tube of the central cooling system is that hollow bilayer cools down nested structure, including outer tube and inner tube, outside
It is passed through flow at high speed cooling water between pipe and inner tube.
The center of the water-cooled chassis opens up the through-hole adaptable with the outer diameter of the hollow double-deck coolant jacket, hollow bilayer
Coolant jacket through the through-hole be installed into water-cooled chassis center and can free to slide in the through hole (transfer motion power be by hydraulic pressure or electronic
There is provided), it is equipped with dynamic sealing assembly between hollow bilayer coolant jacket and the pumping rod of directional solidification furnace formwork, is ensured to the close of vacuum
Sealing property.
The outer tube of the hollow double-deck coolant jacket is made of the good metal material of heat conduction, can provide enough coolings
Temperature gradient.The inner tube top of the hollow double-deck coolant jacket is the tubaeform mouth of a river, and ensureing being capable of shape when cooling water flows to top
At the effect that local flow accelerates, and then increases the cooling effect on cold top and improve the effect of whole flow velocity.
Be passed through the circulating water of 5-6bar in the hollow double-deck coolant jacket, and need to use pure water cooling, to prevent interior cooling
Water fouling generates the case where water channel blocks.
The device further includes hot baffle, is set to the top of the cylindrical metal tube.
It the design principle of the utility model and has the beneficial effect that：
1, the present invention is directed to directional solidification and single crystal super alloy casting, propose a kind of heating of directional solidification furnace center and
Central cooling device and method effectively disappear after central heating system and central cooling system is added in conventional directional solidification furnace
Shadow effect during being manufactured except single crystal blade can efficiently reduce the generation of single crystal casting defect, improve monocrystalline
The quality and performance of blade.
2, it when formwork is in hot-zone heating and thermal insulation, other than the circumferential annular-heating system of directional solidification furnace, additionally uses
Central heating system can effectively eliminate directional solidification process medium casting and generated heat far from circumferential annular by central heating system
The inner shadow effect of body makes to add in similar inside and outside casting by compensating heating to casting shadow region side
Heat condition improves the temperature gradient in directional solidification castings, reduces the generation of coagulation defect to reach identical temperature, improves
The quality and performance of the precision castings such as single crystal blade.
3, it when formwork pulls down to cold-zone cooling, other than circumferential circular radiating cooling system (water-cooling ring), also adopts
Directional solidification and single crystal casting directional solidification process can effectively improve by central cooling system with central cooling system
In far from the cooling effect on the inside of circumferential circular radiating body (water-cooling ring), keep the cooling rate inside and outside casting almost the same；
So as to so that the temperature gradient of crystal growth is almost the same inside and outside blade, efficiently reduce the production of single crystal casting defect
It is raw, improve the quality and performance of monocrystalline.
4, other than the processing and manufacturing of single crystal super alloy casting, apparatus of the present invention and method can also promote the use of it
The directional solidification field of its alloy and part.
Description of the drawings：
Fig. 1 is that existing directional solidification furnace prepares single crystal blade principle schematic.
Fig. 2 is the heating of the utility model directional solidification furnace center and central cooling device structural schematic diagram.
In figure：1- blades do not solidify part；2- blades have solidified part；Area on 3- heaters；Area under 4- heaters；5-
Thermal baffle；6- water-cooled chassis；7- central heating systems；8- central cooling systems.
Specific implementation mode：
The utility model is described in detail with reference to the accompanying drawings and embodiments.
The utility model is the heating of directional solidification furnace center and central cooling device, as shown in Fig. 2.The device be
Increase central heating system 7 and central cooling system 8 in conventional directional solidification furnace, improves in high temperature alloy directional solidification process
Temperature gradient；Wherein：The central heating system 7 includes tubular heater, which, which is set to, is arranged with ring style
The center axial position that multiple formworks surround, to being heated on the inside of shell after energization；The central cooling system 8 includes cylinder
Shape metal tube is set to the middle position of water-cooled chassis 6, by being passed through cooling water in cylindrical metal tube to being carried out on the inside of shell
It is cooling；By increasing central heating system and central cooling system, monocrystalline life inside and outside directional solidification process medium casting is realized
Long temperature gradient is consistent.
The central heating system further includes water cooling copper electrode and temperature thermocouple, and the water cooling copper electrode is sent out with tubular
Hot body top is connected, for drawing electricity；The temperature thermocouple is placed in inside tubular heater,
The tubular heater is isostatic pressing formed graphite or refractory metal material, and heating power is set according to heating region size
It is single-phase electrical gudie structure, heating voltage control is in 40V hereinafter, ensureing the steady operation under vacuum environment between 5-30kw.
The water cooling copper electrode is copper pipe structure, and heat preservation is placed in working chamber as cantilever support by water cooling copper electrode
Bucket is internal, and it is in suspension method to make tubular heater.
The cylindrical metal tube of the central cooling system is that hollow bilayer cools down nested structure, including outer tube and inner tube, outside
It is passed through flow at high speed cooling water between pipe and inner tube.
The center of the water-cooled chassis opens up the through-hole adaptable with the outer diameter of the hollow double-deck coolant jacket, hollow bilayer
Coolant jacket is installed into the central of water-cooled chassis through the through-hole and can be free to slide in the through hole, hollow bilayer coolant jacket and orientation
It is equipped with dynamic sealing assembly between the pumping rod of consolidation furnace formwork, ensures the sealing performance to vacuum.
The outer tube of the hollow double-deck coolant jacket is made of the good metal material of heat conduction, can provide enough coolings
Temperature gradient.The inner tube top of the hollow double-deck coolant jacket is the tubaeform mouth of a river, and ensureing being capable of shape when cooling water flows to top
At the effect that local flow accelerates, and then increases the cooling effect on cold top and improve the effect of whole flow velocity.
Be passed through the circulating water of 5-6bar in the hollow double-deck coolant jacket, and need to use pure water cooling, to prevent interior cooling
Water fouling generates the case where water channel blocks.
The device further includes hot baffle, is set to the top of the cylindrical metal tube.
It is as follows the characteristics of central heating system in the present invention：
The system requirements has good compensation heating efficiency, is independently realizing the temperature for heating and monitoring central warm area.
The monitoring including the entire temperature field in middle section is acted with adjusting with control by uniformly coordinating for control system.It is this
Method can accurately control heating temperature and rate, and large scale shell in directional solidification process is made to obtain uniform and stable temperature
Spend field.
Central heating system uses cartridge heater, concrete shape to determine that center adds according to Leaf positional distribution and concrete technology
The main function of hot systems is the cryogenic effect for compensating " shade " region, and heating power is little, predominantly heat compensation, heater
Using resistance heating manner, overhung construction, water cooling copper electrode draws electricity.Temperature thermocouple and be placed in heater body, with center plus
Hot systems are integrated.Resistance heater is isostatic pressing formed graphite or refractory metal material, and heating power is with big according to heating region
Small is single-phase electrical gudie structure between 5-30kw, and heating voltage is controlled in 40V hereinafter, ensureing the steady operation under vacuum environment；
Water cooled electrode is copper pipe structure, is linked on heater holder by the top of central heating system, electric current is introduced heater, simultaneously
Ensure that electrode has enough coolings.Entire central heating system is placed in as cantilever support in working chamber by water cooled electrode
Inside insulation barrel.
The central cooling system design feature of the present invention：
Central cooling system is a kind of motion of complexity, is substantially said it is on the basis of traditional formwork transmission system
On resettle the relative motion system of a set of inside.Its main function is the coolant jacket for having hollow bilayer, inside in work
Centralised temperature gradient necessary to keeping flow at high speed cooling water to be used for providing when making.This mode is also for elimination formwork
Internal " shade " effect.
The transfer motion power of central cooling system can be provided by electronic or hydraulic pressure, the hollow double-deck coolant jacket of central cooling system with
It is equipped between the pumping rod of formwork legacy system and passes seal assembly, ensure the sealing performance to vacuum.While in order to ensure center
An outer diameter is opened slightly larger than the hollow double-deck cooling in the water-cooled chassis center of the often running certainly of cooling system, traditional formwork transmission system
The outer diameter of set.The outer wall of hollow bilayer coolant jacket is made of the good metal material of heat conduction, can provide enough cooling temperature
Spend gradient.
Inside hollow bilayer coolant jacket, it is equipped with an inner tube, inner tube top is the tubaeform mouth of a river, ensures that cooling water flows to top
When can form the effect of local flow acceleration, and then increase the cooling effect on cold top and improve the effect of whole flow velocity.
To ensure that the cooling effect of central cooling system, entire central cooling system use the high service water of 5- 6bar,
And pure water cooling must be used, to prevent interior cooling water scaling from generating the case where water channel blocks.
The present invention cools down in draw process to being supplemented by central cooling system on the inside of shell.When shell as ring-type is tied
When brilliant device system moves downward, central cylindrical shape water-cooled metal pipe remains stationary as；It can pass through central water on the inside of shell at this time
Cold metal pipe radiates, in casting solidification, can effectively be cooled down to enhancing on the inside of casting, make to be in inside and outside casting
Similar solidification cooling condition.After Blade roughcast solidifies, central cylindrical shape water-cooled metal pipe moves back down to and ring
The concordant state in shape water mold upper surface.In addition, applying hot baffle in central cylindrical shape water-cooled metal tube top portion, so that it may with
Avoid above-mentioned shell bottom due to there is no hot baffle to make shadow region temperature problem more lower than sunny side.
Comparative example 1：
When being oriented solidification using conventional directional solidification furnace as shown in Figure 1, the process of setting of single crystal blade is carried out
It simulates, the solid liquid interface in casting is inclined from outside to inside, and at crystal growth to listrium or integral shroud, this is easy for causing miscellaneous
The formation of the coagulation defects such as crystalline substance.
Embodiment 1：
After the central heating system of apparatus of the present invention, effectively casting can be compensated in shadow region side and added
Heat makes to be in similar heating condition inside and outside blade, to reach identical temperature, so that crystal growth inside and outside blade
Temperature gradient it is almost the same, reduce single crystal casting defect generation.After the central cooling system in the present invention, under formwork
When moving cold-zone cooling to, the cooling effect of side in shadow region during single crystal blade is manufactured is can effectively improve,
Make to be in similar solidification cooling condition inside and outside blade, so that the cooling rate of crystal growth basic one inside and outside blade
It causes.After directional solidification furnace of the present invention with center heating and central cooling device, to the process of setting of single crystal blade into
Simulation is gone, in analog result, the freezing interface in casting is substantially flat, the temperature gradient inside and outside casting and cooling speed
Rate is almost the same, so as to efficiently reduce the generation of monocrystalline coagulation defect, improves the quality and performance of single crystal blade.Using
The generation that casting flaw can be effectively reduced after the utility model, produces qualified single crystal blade.Using single after the utility model
Brilliant blade qualification rate improves 30%.
Claims (10)
1. a kind of directional solidification furnace is heated with center and central cooling device, it is characterised in that：The device is in directional solidification furnace
Middle increase central heating system and central cooling system improve the temperature gradient in high temperature alloy directional solidification process；Wherein：Institute
It includes tubular heater to state central heating system, which is set to the center surrounded with multiple formworks that ring style arranges
At shaft position, to being heated on the inside of shell after energization；The central cooling system includes cylindrical metal tube, is set to Water-cooled bottom
The middle position of disk, by being passed through cooling water in cylindrical metal tube to being cooled down on the inside of shell；Added by increase center
Hot systems and central cooling system realize that the temperature gradient of crystal growth inside and outside directional solidification process medium casting is consistent.
2. directional solidification furnace according to claim 1 is heated with center and central cooling device, it is characterised in that：In described
Heart heating system further includes water cooling copper electrode and temperature thermocouple, and the water cooling copper electrode is connected with tubular heater top
It connects, for drawing electricity；The temperature thermocouple is placed in inside tubular heater.
3. directional solidification furnace according to claim 2 is heated with center and central cooling device, it is characterised in that：The cylinder
Shape heater be isostatic pressing formed graphite or refractory metal material, heating power according to heating region size be set to 5-30kw between,
For single-phase electrical gudie structure, heating voltage control is in 40V hereinafter, ensureing the steady operation under vacuum environment.
4. directional solidification furnace according to claim 2 is heated with center and central cooling device, it is characterised in that：The water
Cold copper electrode is copper pipe structure, is placed in inside insulation barrel in working chamber as cantilever support by water cooling copper electrode, makes tubular
Heater is in suspension method.
5. directional solidification furnace according to claim 1 is heated with center and central cooling device, it is characterised in that：In described
It is the hollow double-deck cooling nested structure, including outer tube and inner tube to entreat the cylindrical metal tube of cooling system, is led between outer tube and inner tube
Enter flow at high speed cooling water.
6. directional solidification furnace according to claim 5 is heated with center and central cooling device, it is characterised in that：The water
The center on cold chassis opens up the through-hole adaptable with the outer diameter of the hollow double-deck coolant jacket, and hollow bilayer coolant jacket is through the through-hole
It is installed into the center of water-cooled chassis and can be free to slide in the through hole, the pumping of hollow double-deck coolant jacket and directional solidification furnace formwork
It is equipped with dynamic sealing assembly between pull rod, ensures the sealing performance to vacuum.
7. directional solidification furnace according to claim 5 is heated with center and central cooling device, it is characterised in that：The sky
The outer tube of heart bilayer coolant jacket is made of the good metal material of heat conduction, can provide enough cooling temperature gradients.
8. directional solidification furnace according to claim 5 is heated with center and central cooling device, it is characterised in that：The sky
The inner tube top of heart bilayer coolant jacket is the tubaeform mouth of a river, ensures that local flow acceleration can be formed when cooling water flows to top
Effect, and then increase the cooling effect on cold top and improve the effect of whole flow velocity.
9. directional solidification furnace according to claim 5 is heated with center and central cooling device, it is characterised in that：Institute is hollow
It is passed through the circulating water of 5-6bar in the double-deck coolant jacket, and needs to use pure water cooling, to prevent interior cooling water scaling from generating water channel
The case where blocking.
10. directional solidification furnace according to claim 1 is heated with center and central cooling device, it is characterised in that：The dress
It further includes hot baffle to set, and is set to the top of the cylindrical metal tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721135075.6U CN207619552U (en) | 2017-09-06 | 2017-09-06 | A kind of directional solidification furnace center heating and central cooling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721135075.6U CN207619552U (en) | 2017-09-06 | 2017-09-06 | A kind of directional solidification furnace center heating and central cooling device |
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| CN207619552U true CN207619552U (en) | 2018-07-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385513A (en) * | 2017-09-06 | 2017-11-24 | 中国科学院金属研究所 | A kind of directional solidification furnace is heated with center and central cooling device |
| CN109570444A (en) * | 2018-09-30 | 2019-04-05 | 鹰普航空零部件（无锡）有限公司 | A kind of manufacturing process of complex-shaped surface mould stainless cast steel part |
| CN111915586A (en) * | 2020-07-30 | 2020-11-10 | 东北大学 | Method and device for detecting offset of strip steel |
| CN113798475A (en) * | 2021-08-02 | 2021-12-17 | 东方电气集团东方汽轮机有限公司 | Device for improving temperature gradient of directional solidification test bar and preparation method |
-
2017
- 2017-09-06 CN CN201721135075.6U patent/CN207619552U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385513A (en) * | 2017-09-06 | 2017-11-24 | 中国科学院金属研究所 | A kind of directional solidification furnace is heated with center and central cooling device |
| CN107385513B (en) * | 2017-09-06 | 2023-11-10 | 中国科学院金属研究所 | Central heating and central cooling device for directional solidification furnace |
| CN109570444A (en) * | 2018-09-30 | 2019-04-05 | 鹰普航空零部件（无锡）有限公司 | A kind of manufacturing process of complex-shaped surface mould stainless cast steel part |
| CN111915586A (en) * | 2020-07-30 | 2020-11-10 | 东北大学 | Method and device for detecting offset of strip steel |
| CN113798475A (en) * | 2021-08-02 | 2021-12-17 | 东方电气集团东方汽轮机有限公司 | Device for improving temperature gradient of directional solidification test bar and preparation method |
| CN113798475B (en) * | 2021-08-02 | 2023-02-21 | 东方电气集团东方汽轮机有限公司 | Device for improving temperature gradient of directional solidification test bar and preparation method |
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Denomination of utility model: A central heating and central cooling device for directional solidification furnace Effective date of registration: 20220225 Granted publication date: 20180717 Pledgee: Fushun Bank Co.,Ltd. Development Zone sub branch Pledgor: Liaoning Hongyin Metal Co.,Ltd. Registration number: Y2022210000012 |