CN100589671C - Composite induction heating apparatus solidifying directionally with high temperature gradient - Google Patents
Composite induction heating apparatus solidifying directionally with high temperature gradient Download PDFInfo
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- CN100589671C CN100589671C CN200710017592A CN200710017592A CN100589671C CN 100589671 C CN100589671 C CN 100589671C CN 200710017592 A CN200710017592 A CN 200710017592A CN 200710017592 A CN200710017592 A CN 200710017592A CN 100589671 C CN100589671 C CN 100589671C
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Abstract
The present invention provides a composite induction heating device of high temperature gradient directional solidification, a concentrated strengthening heating area is composed by a ring shaped lining and a heating coil, and a pre-heating area is composed by the heating coil, and two areas are integrated, forming the composite induction heating device. The lining is an unsealed copper ring; thesection of the lining inner cavity is a ladder cavity, the bottom is equipped with an edge shaped via enclosing a crucible; the heating coil is silverly welded in the arc groove of the cylindrical surface of the lining, and the upper of the lining winds a few turns coil around the center of the crucible; the two ends of the composite induction heating device are accessed to a high frequency induction power respectively. The invention preheats and strengthens heating to a test part by the composite induction device on the same heating power, thereby improving the temperature gradient, limitingthe overheating at the front of the interface along the smaller area, simplifying the processing parameter, acquiring the higher cooling speed, improving the mechanical properties of the material.
Description
(1) technical field
The present invention relates to the high-temperature gradient acquisition technology of high temperature alloy directional solidification, specifically is a kind of composite induction heating apparatus of high-temperature gradient directional solidification.
(2) background technology
The directional solidification technique of high temperature alloy is the key technology that advanced aero-engine core heat end pieces is made.For better control or optimize oriented freezing organization, obtain higher, more stable performance, need the curing conditions such as heat transfer, mass transfer of control oriented growth.Heating condition in the directional solidification process is one of them very crucial part.By strengthening the heating and cooling condition, can improve the temperature gradient of directional solidification process, thus reduce the oriented growth defective formation, improve the mechanical property of alloy.
Mode of heating in the directional solidification technique has a variety of: normally induction melting adds insulation of graphite induction heating or graphite resistance heat tracing, also has direct induction heating, the molten heating of area electron beam, the molten heating of laser zone etc.Wherein, electron beam and LASER HEATING concentration of energy help the significantly raising of temperature gradient, still can only calorify the surface, crucible can not be arranged, and the geomery of moulding is very little, generally can only the undersized wire rod of moulding.The directed high-temperature alloy part of industrial production adopts the method for graphite heating usually, wherein during the graphite induction heating, and quick heating, but be not easy to realize closed-loop control to melt; Graphite resistance heating temperature control is easy, but it is very slow to heat up.These two kinds of mode of heatings are all to be to adopt in the directed overheating insulation stage, be to be undertaken by heat conduction owing to conduct heat, and the heat-blocking action of ceramic shell mould are obvious, thus very limited to the melt overheat effect of directional solidification, thus the temperature gradient that reaches is lower.The someone has proposed to utilize high-frequency induction to concentrate forward position, freezing interface liquid phase is heated at present, thereby effectively raise the temperature gradient in solid liquid interface forward position, cooling rate is greatly improved, and can make material structure obtain refinement, has increased substantially the mechanical property of material.But, the induction heating of this zone melting liquid metal cooling method, under the withdrawing rate condition with higher, the melting capacity hysteresis withdrawing rate of test specimen, thus cause test specimen fully not melt, this has just limited the further raising of cooldown rate.In order to address this problem, also have and adopt two induction heaters up and down, be connected on respectively on two heating power supplies.Top induction heater connects low-frequency power, and test specimen is carried out preheating, and following induction heater connects high frequency induction power supply, and test specimen is concentrated heating.Make experiment parameter complicated more like this, experimental technique is difficult to control.
The present invention is directed to the induction heating technique of high gradient directional solidification, proposed a kind of composite sensing coil, can overcome the above problems preferably.
(3) summary of the invention
For the reinforcement heats that overcomes the solid liquid interface forward position that exists in the prior art limited, the test specimen fusing is insufficient, and when adopting up and down two induction heaters, make experiment parameter complicated more, experimental technique is difficult to the deficiency of control, the present invention proposes a kind of composite induction heating apparatus of high-temperature gradient directional solidification.
Composite induction heating apparatus and pull system, crucible that the present invention proposes are arranged in body of heater jointly, are placed on the thermal insulation board.Composite induction heating apparatus is made of to concentrate liner and coil strengthens the thermal treatment zone, is made of coil to preheat the district, and integrates both; Do heater coil with copper tube.
Liner that concentrate to strengthen the thermal treatment zone is untight copper annulus, promptly has one by the perforation joint-cutting of circle ring center to the cylindrical in liner annulus one side, avoids that electric current constitutes the loop and makes power supply short circuit in the annulus liner; In joint-cutting, be filled with the insulation mica tape; The liner internal cross section is the ladder cavity that top is big, the bottom is little, and ladder cavity bottom centre place is the tooth shape through hole, and its effect is that the inductive loop with the composite induction heating apparatus bottom concentrates on the tooth shape part of this through hole, thereby real part is concentrated heating; Crucible is inserted tooth shape through hole center, is connected with the pull system by joint; The tooth shape through-hole diameter is greater than the crucible external diameter.The outer round surface of liner has arc groove, and the width of this groove is greater than the external diameter of heater coil, and a circle copper pipe silver soldering of heater coil one end in this arc groove, has promptly been formed the concentrated reinforcement of the present invention thermal treatment zone.
After remaining heater coil is wrapped with the insulation mica tape, above ring lining, be that the circle coil is counted in the center coiling, promptly formed regenerator section of the present invention with the crucible.The number of turn of preheating zone coil determines that by test specimen length test specimen length over half is in the composite induction heating apparatus; The internal diameter of preheating zone coil is greater than the crucible external diameter, and the preheat temperature that will reach according to test specimen and the heating power of high frequency induction power supply are regulated.
Feed the running water that inserts by the electrode place in the induction heater copper pipe whole compound inductors is cooled off, and high frequency induction power supply is inserted at the two ends of induction heater coils respectively.
The technical solution adopted in the present invention, concentrating the preheating of carrying out higher temperature more than the reinforcement thermal treatment zone, guarantee that melt can obtain enough superheating ratios under the high speed pull via the concentrated reinforcement thermal treatment zone time, thereby realize that high temperature gradient reaches higher cooldown rate.
The present invention is on a power supply, realized simultaneously real part is preheated and concentrate the reinforcement heating by an induction heater, both simplified the experimental technique parameter, obtained higher cooldown rate simultaneously again, refinement the microstructure of material, thereby improved the mechanical property of material.The present invention is the overheated less zone, forward position, interface that is confined to, and makes that corundum crucible can be because of long-time overheated the damage in the directional solidification process.
(4) description of drawings
Fig. 1 is the structural representation of device used herein.
Fig. 2 is the structural representation of composite induction heating apparatus of the present invention.
Fig. 3 and Fig. 4 are respectively the elevation cross-sectional view and the vertical views of not closed tooth shape red copper annulus liner.
Fig. 5 is the Temperature Distribution schematic diagram of composite induction heating apparatus.
Fig. 6 is the structural representation of execution mode.Among the figure:
1. body of heater 2. thermal insulation boards 3. cooling fluids 4. crucibles 5. composite induction heating apparatus 6. joints
7. vacuum system 8. pull systems 9. high frequency induction power supplies, 10. heater coils, 11. liners
12. annulus liner tooth shape part 13. preheat temperatures 14. are concentrated heating-up temperature
(5) embodiment
The composite induction heating apparatus that present embodiment proposes is made of to concentrate copper liner and coil strengthens the thermal treatment zone, is made of coil to preheat the district, and integrates both.The sample dimensions of present embodiment is: φ 7 * 80mm, and crucible outside dimension φ 8mm, power supply high frequency induction power supply frequency 200kHz (Fig. 6), the copper tube that with the internal diameter is φ 6mm, wall thickness 1mm is as heater coil.
In concrete the enforcement:
Liner 11 that concentrate to strengthen the thermal treatment zone be the not sealing copper annulus of external diameter 40mm, promptly have on the annulus wall of liner 11 1 sides one from the annulus center perforation joint-cutting to the cylindrical, make the disconnection of coil the two poles of the earth, avoid power supply short circuit; In joint-cutting, be filled with the insulation mica tape.It is big that the internal cross section of liner 11 is top, the ladder cavity that the bottom is little, and it is the tooth shape through hole 12 of 1mm that there is the degree of depth at ladder cavity bottom centre place, feasible heating to test specimen concentrates in the very narrow scope; Crucible 4 is inserted tooth shape through hole 12 centers, is connected with the pull system by joint 6, and the gap of 1.5mm is arranged between the external diameter of the internal diameter of tooth shape through hole 12 and crucible 4.The liner circular surfaces has arc groove, and the width of this groove is greater than the external diameter of heater coil 10, and a circle copper pipe of heater coil 10 1 ends is welded in this arc groove, has promptly formed the concentrated reinforcement of the present invention thermal treatment zone.When weld heating coil 10, after staying certain-length as the splicing ear that connects high frequency induction power supply one end of heater coil, from joint-cutting one end, heater coil is embedded the outer round recessed of ring lining, and connect with silver soldering, the other end that always is welded to joint-cutting finishes, but can not be with the joint-cutting seam on the ring lining together.After afterwards remaining coil being wrapped with the insulation mica tape, above ring lining, be that the circle coil is counted in the center coiling, promptly formed regenerator section with crucible 4; The number of turn of institute's coiling should make test specimen length over half be in the composite induction heating apparatus 5.
After winding finishes, stay certain-length heater coil 10 as another terminal that connects high frequency induction power supply 9.On two of the composite induction heating apparatus terminals that connect high frequency induction power supplies, adopt silver soldering to connect to burn-on two nuts respectively.Again composite induction heating apparatus is installed on the thermal insulation board.
When using composite induction heating apparatus (Fig. 1), crucible 4 clampings that test specimen will be housed earlier are on joint 6, the placement center has the thermal insulation board 2 of through hole again, and then on the thermal insulation board composite induction heating apparatus 5 is being received on the high frequency induction power supply 9, crucible 4, thermal insulation board 2 and composite induction heating apparatus 5 sealed body of heater 1 after with one heart, by vacuum system 7 body of heater 1 is extracted into certain vacuum degree again, open high frequency induction power supply 9 then, by composite induction heating apparatus 5 heat fused test specimens, after test specimen reaches desired temperature, pull system 8 with predetermined speed with test specimen and crucible 4 by in the joint 6 downward pulls immersion cooling fluids 3 test specimen being solidified.Test specimen is constantly by composite induction heating apparatus 5 heat fused, and or else open close pull system excessively 8 immerses to solidify in the cooling fluids 3 and realizes directional solidification.
In the use, in copper pipe, feed the running water that inserts by the electrode place whole compound inductors is cooled off.
Claims (2)
1. the composite sensing heating system of a high-temperature gradient directional solidification, comprise body of heater (1), crucible (4), thermal insulation board (2), joint (6), pull system (8), heater and high frequency induction power supply (9), it is characterized in that heater is to comprise concentrating the composite induction heating apparatus (5) of strengthening the thermal treatment zone and preheating the district, wherein concentrate and strengthen the thermal treatment zone by liner (11) and heater coil (10) formation, preheat the district and constitute, and both are integrated in one by heater coil (10); Liner (11) that concentrate to strengthen the thermal treatment zone be untight copper annulus, is having one on liner annulus one side by the perforation joint-cutting of circle ring center to the cylindrical, avoiding heater coil formation short circuit on it, and is filled with the insulation mica tape in this joint-cutting; The internal cross section of liner (11) is ladder cavity, and there is tooth shape through hole (12) the cavity bottom center, and its effect is that the inductive loop with composite induction heating apparatus bottom concentrates on the tooth shape part of this through hole, thereby test specimen is concentrated heating; Crucible (4) is inserted tooth shape through hole (12) center, is connected with pull system (8) by joint (6); Heater coil (10) is made by copper pipe, with a circle copper pipe silver soldering of heater coil (10) one ends in the arc groove of liner (11) outer round surface, to form the above-mentioned concentrated reinforcement thermal treatment zone, and remaining heater coil is wrapped with behind the insulation mica tape in liner (11) top with crucible (4) is that circle is counted in the center coiling, to form the above-mentioned district that preheats; Same high frequency induction power supply (9) is inserted at the two ends of heater coil respectively; When using this composite sensing heating system, crucible (4) clamping that test specimen will be housed earlier is on joint (6), the placement center has the thermal insulation board (2) of through hole again, and then on the thermal insulation board this composite induction heating apparatus (5) is being received on the high frequency induction power supply (9), crucible (4), seal body of heater (1) after thermal insulation board (2) and composite induction heating apparatus (5) are concentric, by vacuum system (7) body of heater (1) is extracted into certain vacuum degree again, open high frequency induction power supply (9) then, by composite induction heating apparatus (5) heat fused test specimen, after test specimen reaches desired temperature, pull system (8) with predetermined speed with test specimen and crucible (4) by in joint (6) the pull immersion downwards cooling fluid test specimen being solidified; Test specimen is constantly by composite induction heating apparatus (5) heat fused, and or else open close pull system (8) excessively immerses to solidify in the cooling fluid and realizes directional solidification.
2. a kind of composite sensing heating system of high-temperature gradient directional solidification according to claim 1 is characterized in that feeding in the heater coil (10) water so that whole composite induction heating apparatus (5) is cooled off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710017592A CN100589671C (en) | 2007-03-30 | 2007-03-30 | Composite induction heating apparatus solidifying directionally with high temperature gradient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710017592A CN100589671C (en) | 2007-03-30 | 2007-03-30 | Composite induction heating apparatus solidifying directionally with high temperature gradient |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101277559A CN101277559A (en) | 2008-10-01 |
| CN100589671C true CN100589671C (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710017592A Expired - Fee Related CN100589671C (en) | 2007-03-30 | 2007-03-30 | Composite induction heating apparatus solidifying directionally with high temperature gradient |
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| CN (1) | CN100589671C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718722B (en) * | 2009-11-19 | 2012-07-04 | 西北工业大学 | Double-crucible directional solidification device |
| CN101797639B (en) * | 2010-04-08 | 2011-09-14 | 西北工业大学 | Device for directionally solidifying by locally and forcibly heating with resistance at high gradient |
| CN106998601A (en) * | 2017-04-02 | 2017-08-01 | 兰州理工大学 | A kind of method that utilization reducing varying pitch induction coil realizes thermograde |
| CN112475683B (en) * | 2020-11-24 | 2023-02-21 | 中车大连机车车辆有限公司 | Device and method for preheating circumferential weld joint and heating and slow cooling |
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2007
- 2007-03-30 CN CN200710017592A patent/CN100589671C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101277559A (en) | 2008-10-01 |
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