CN201234368Y - Electromagnetic induction heating device - Google Patents
Electromagnetic induction heating device Download PDFInfo
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- CN201234368Y CN201234368Y CNU2008200297323U CN200820029732U CN201234368Y CN 201234368 Y CN201234368 Y CN 201234368Y CN U2008200297323 U CNU2008200297323 U CN U2008200297323U CN 200820029732 U CN200820029732 U CN 200820029732U CN 201234368 Y CN201234368 Y CN 201234368Y
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Abstract
The utility model relates to an electromagnetic-induction heater, which comprises two high-frequency inductors (4), wherein the top and the bottom surfaces of each high-frequency inductor are inclined in shape of internal cone; an insulating plate (6) is arranged between the two high-frequency inductors; and a circuit-breaking groove is formed on the insulating plate in the redius direction. The thickness of the inner circumference of each high-frequency inductor is 1/4 of that of the outer circumference thereof. Both the inside diameter and the outside diameter at one end of a graphite heating piece (3) are larger than the inside diameter and the outside diameter at the other end thereof, and the larger end and the smaller end of the graphite heating piece are transited at a 45 degree oblique angle, so that the graphite heating piece is funnel-shaped. The inside diameter of the smaller end of the graphite heating piece (3) is larger than the outside diameter of a ceramic crucible (1). The smaller end of the graphite heating piece (3) is subjected to the forced induction heating by the blade-shaped part of each high-frequency inductor (4), thereby generating high temperature gradient at the forefront of the molten solid/liquid interface. The larger end of the graphite heating piece (3) preheats a test stick inside the ceramic crucible (1), thereby ensuring complete melting and overheat of the test stick at a high withdrawal rate. The electromagnetic-induction heater can ensure high temperature gradient and low melt flow during the directional solidification process.
Description
One, technical field
The present invention relates to the directional solidification control in material field, specifically is a kind of electromagnetic induction heater.
Two, background technology
The directional solidification technique that is proposed by Bridgman is the significant development of advanced material process technology in modern age.Compare with the foundry goods that the conventional cast method obtains, directional solidification gained columanar structure has significantly reduced segregation, casting flaw such as loose, has formed the crystal grain parallel with the principal axes of stress, has eliminated horizontal crystal boundary and has improved the performance of structural material significantly.In actual production, the application of directional solidification technique has improved elevated temperature strength, thermal fatigue property, creep and the persistent characteristic of high temperature alloy, makes the blade of aviation engine mechanical property with single load bearing requirement that new leap arranged.Simultaneously, this technology also is used for the preparation of many functional materials such as semiconductor, magnetic material, optical crystal, superconductor, as magnetic material iron etc., using directed solidification technology can make its column crystal along the growth of magnetized axis direction, thereby obtains having the foundry goods of good magnetic performance.Therefore, updating of directional solidification technique and device is the important means that promotes the development of high-performance advanced material.The important technical parameter that temperature gradient in the directional solidification process in the liquid phase of solid/liquid interfaces forward position and crystal growth rate are directional solidification technique, wherein the ratio of temperature gradient and growth rate is the important criterion of control crystal growth form.Under the condition that improves temperature gradient, can suitably increase growth rate, obtain desired crystal habit, and thinning solidification structure, improve casting quality, can also improve the productivity ratio of directional solidification castings simultaneously.So the development of directional solidification technique is a target to improve the solid/liquid interfaces temp gradient at front edge all.
Mode of heating is the key factor of decision temperature gradient height, and the mode of heating in laboratory and the industrial production directional solidification process mainly contains resistance heating and electromagnetic induction heating at present.Resistance heating is to use material with high-melting-point and high conductivity such as tantalum etc. as heater heating coupon, and this method has uniform distribution of temperature field, heating-up temperature is high and can not produce advantage such as outfield interference to melt.But calandrias such as tantalum cost an arm and a leg, and are very high to the vacuum degree requirement in the experimentation, and heating and cooling speed is very slow.Because resistance heating is mainly by radiant heat transfer, heating surface (area) (HS is big, be difficult to make heat to concentrate and obtain in the part big density of heat flow rate, thereby temperature gradient is very low.Electromagnetic induction heating is that sample is placed among the induction coil, and the metal or the semiconductor induced inside that are in alternating magnetic field produce eddy current, utilize eddy current and magnetic hysteresis loss to produce heat.Because heat results from coupon itself fully in the electromagnetic induction heating process, energy density is big, realizes narrow melting zone, overheated greatly easily, thereby can obtain the high rate of heat addition and high temperature gradient.But electromagnetic force stirs the pressure of melt and makes the oriented freezing organization that is difficult to obtain stable growth in the coupon.
At present, the directional solidification process adopts the mode of graphite resistance heating more, this method is because graphite relative low price and temperature control are easy, therefore be subjected to extensive concern, but mechanism's complexity of graphite resistance heating, fault is frequent and be difficult to safeguard that the gained temperature gradient is still lower simultaneously, only has about 100K/cm.Northwestern Polytechnical University has proposed the method for electromagnetic induction in conjunction with graphite heating in application number is 200810017988.7 patent application document, realized that heating rate is fast and shielded most of electromagnetic stirring force, has obtained oriented freezing organization preferably.Analyze and find, though this method has obtained the higher temperature gradient in the 200K/cm left and right sides by the shape that changes graphite heater, but because electromagnetic inductor and graphite heater height are bigger, heating surface (area) (HS is big, be difficult to make the melt in solid/liquid interfaces forward position to obtain to concentrate heating, so the raising of temperature gradient is limited.Simultaneously, the thickness of graphite heater is to the shielding of electromagnetic field and bigger to the heating efficiency influence of coupon: graphite heater is blocked up, the good but temperature gradient decline of magnetic field shielding; Graphite heater is thin excessively, and temperature gradient height but electromagnetic stirring force in the melt is big is unfavorable for the acquisition of oriented freezing organization.
Three, summary of the invention
For overcome in the heating process that exists in the prior art heat up and rate of temperature fall slow, temperature gradient is low, the electromagnetic induction heating mixing power is too big, is unfavorable for the deficiency of directed tissue growth, the present invention proposes a kind of electromagnetic induction heater.
The present invention includes graphite induction heating equipment, ceramic crucible, water mold, vacuum chamber, vacuum drawn system, following pull system and high-frequency induction heating power.Wherein, the graphite induction heating equipment is made up of coil, high-frequency inductor, graphite heating body and last heat insulating board.Coil is two circles, is enclosed within the high-frequency inductor outer round surface groove, by weld structure and high-frequency inductor seamless link.
High-frequency inductor is two circle annulars, and diameter of bore is greater than the external diameter of graphite heating body small end, and external peripheral surface has the mounting groove of coil.Two circle high-frequency inductors are to be combined by two single turn high-frequency inductors that structure is identical, direction is opposite.A surface of single turn high-frequency inductor is attenuate gradually from outside to inside, becomes the inclined-plane, and another surface is the plane, and the mounting groove of a turn coil is arranged at the external peripheral surface of single turn high-frequency inductor; The plane of two single turn high-frequency inductors is fit together, formed inner conical high-frequency inductor of the present invention.The thickness of high-frequency inductor inner circle is 1/4 of cylindrical place thickness.For preventing short circuit, between two single turn high-frequency inductors that fit, install insulation board additional.High-frequency inductor upper edge radial direction has the groove of opening circuit.
Graphite heating body is the hollow revolving body, and the internal diameter of an end and external diameter all greater than the internal diameter and the external diameter of the other end, have formed big end and small end, and greatly the end and small end between 45 ° of oblique angle transition, make graphite heating body be infundibulate.The internal diameter of calandria small end is greater than the external diameter of ceramic crucible.
During installation:
The spill radiation baffle placed contain cooling with on the water mold of liquid metal.Embed in the coil mounting groove on the high-frequency inductor excircle coil and firm welding; The small end of graphite heating body is packed in two circle high-frequency inductor endoporus, and the tooth shape place of coil inner conical is cooperated with the outer wall of graphite heating body small end; Last heat insulating board places on the big end of graphite heating body, has formed the graphite induction heating equipment.The graphite induction heating equipment is placed on the radiation baffle.High-frequency inductor is connected with high-frequency induction heating power by coil.The mesopore that ceramic crucible passes spill radiation baffle, graphite heating body and last heat insulating board is connected with following pull system, and and inwall, spill radiation baffle inwall and the last heat insulating board inwall of graphite heating body small end with the gap of possessing 1.5～2mm between the ceramic crucible.Above assembly is placed vacuum chamber jointly.
The present invention is processed into inner conical with induction heater, induction heating is forced to the small end of infundibulate graphite heating body in its tooth shape position, small end in the infundibulate graphite heating body obtains very high density of heat flow rate, make the coupon in the radiation heating ceramic crucible of infundibulate graphite heating body small end position, obtained very high temperature gradient in melt solid/liquid interfaces forward position.The big end of infundibulate graphite heating body is to the coupon preheating in the ceramic crucible, guarantees the abundant fusing of coupon under the high withdrawing rate and overheated.Simultaneously, through design, shielded electromagnetic force the pressure of melt in the coupon has been stirred infundibulate graphite heating body small end thickness.Utilize this device, can in TiAl alloy, high temperature alloy, obtain the high-temperature gradient of 400～700K/cm, and under low melt flow, make and obtained the growth of fine and closely woven straight and upright column crystal in the solidified structure.Therefore, under the electromagnetic induction heating condition, the present invention has realized that in the directional solidification process high temperature gradient low melt body flows.
Four, description of drawings
Fig. 1 is the electromagnetic induction heater structural representation,
Fig. 2 is the structural representation of graphite heating body,
Fig. 3 is a single turn inner conical high-frequency inductor vertical view,
Fig. 4 is a single turn inner conical high-frequency inductor A-A sectional view,
Fig. 5 is two circle inner conical high-frequency inductor structural representations,
Fig. 6 is the structural representation of induction heating equipment,
Fig. 7 is the structural representation of specific embodiment.Among the figure:
1. heat insulating board 3. infundibulate graphite heating body 4. inner conical high-frequency inductors on the ceramic crucible 2.
5. coil 6. insulation boards 7. high-frequency induction heating powers 8. vacuum drawn systems
9. vacuum chamber 10. spill radiation baffles 11. cool off with liquid metal 12. water molds
13. following pull system 14. weld structures
Five, embodiment
Present embodiment comprises graphite induction heating equipment, ceramic crucible 1, water mold 12, vacuum chamber 9, vacuum drawn system 8, following pull system 13 and high-frequency induction heating power 7.The frequency of high-frequency induction heating power 7 is 200KHZ, and the external diameter of ceramic crucible 1 is 9mm.
As shown in accompanying drawing 6, the graphite induction heating equipment is made up of coil, high-frequency inductor 4, graphite heating body 3 and last heat insulating board 2.Coil is two circles, adopts the hollow copper tube of 6mm to make, and is enclosed within the high-frequency inductor outer round surface groove, by weld structure 14 and high-frequency inductor seamless link.
The high-frequency inductor 4 usefulness red coppers of annular are made, and are two circles, and it is the arc groove of 6mm that its external peripheral surface has diameter, is used to install coil 5; High-frequency inductor 4 diameter of bores are greater than the external diameter of graphite heating body small end.Two circle high-frequency inductors are to be combined by two single turn high-frequency inductors that structure is identical, direction is opposite.A surface of single turn high-frequency inductor is attenuate gradually from outside to inside, becomes the inclined-plane, and another surface is the plane; And the mounting groove that a turn coil 5 is arranged at the external peripheral surface of single turn high-frequency inductor; The plane of two single turn high-frequency inductors is fit together, formed the inner conical high-frequency inductor 4 of present embodiment.The thickness of high-frequency inductor inner circle is 1/4 of cylindrical place thickness.In the present embodiment, the cylindrical place thickness of high-frequency inductor 4 is 6mm, and the thickness of inner circle is 1.5mm, and smooth transition between cylindrical and the interior circle, makes the interior round-formed taper of high-frequency inductor; For preventing short circuit, between two single turn high-frequency inductors 4 that fit, install insulation board 6 additional.It is the groove that opens circuit of 1.5mm that high-frequency inductor 4 upper edge radial directions have width, and the position of the groove that opens circuit of two circle high-frequency inductors is corresponding.
The graphite heating body made from high-purity electrode graphite 3 is the hollow revolving body, and the internal diameter of its first half and external diameter have formed big end and small end all greater than the internal diameter and the external diameter of Lower Half, and 45 ° of oblique angle transition between end and the small end greatly, makes graphite heating body be infundibulate.The internal diameter of graphite heating body 3 small ends is greater than the external diameter of ceramic crucible.In the present embodiment, in order to ensure the efficient of radiation heating, the distance between the inwall of graphite heating body 3 and ceramic crucible (1) outer wall is 1.5mm.The height of graphite heating body 3 small ends is 13mm, and wall thickness is 9mm.The big end height of graphite heating body 3 is 5mm, and wall thickness is 7mm.Graphite heating body 3 small ends are packed in two circle high-frequency inductor endoporus.
The inwall of graphite heating body 3 small ends, spill radiation baffle 10 mesopore inwalls and last heat insulating board 2 mesopore inwalls are with possessing 1.5～2mm gap between the ceramic crucible 1.The distance that 1.5～2mm is arranged between the external diameter of the internal diameter of inner conical high-frequency inductor 4 with graphite heating body 3.
During installation:
Present embodiment is processed into inner conical with induction heater 4, induction heating is forced to the small end of infundibulate graphite heating body 3 in its tooth shape position, small end in infundibulate graphite heating body 3 obtains very high density of heat flow rate, make the coupon in the infundibulate graphite heating body 3 small end position radiation heating ceramic crucibles 1, obtained very high temperature gradient in melt solid/liquid interfaces forward position.The big end of infundibulate graphite heating body 3 is to the coupon preheating in the ceramic crucible 1, guarantees the abundant fusing of coupon under the high withdrawing rate and overheated.Simultaneously, through design, shielded electromagnetic force the pressure of melt in the coupon has been stirred infundibulate graphite heating body 3 small end thickness.Utilize this device, in TiAl alloy, high temperature alloy, obtained the high-temperature gradient of 400～700K/cm, obtained fine and closely woven straight and upright column crystal growth in the solidified structure and do not observed the influence of flowing dendritic growth.Therefore, under the electromagnetic induction heating condition, utilize this device to realize that in the directional solidification process high temperature gradient low melt body flows.
Claims (4)
1. electromagnetic induction heater, comprise the graphite induction heating equipment, ceramic crucible (1), water mold (12), vacuum chamber (9), vacuum drawn system (8), following pull system (13) and high-frequency induction heating power (7), radiation baffle (10) places and contains on the water mold (12) of cooling with liquid metal (11), by coil (5), high-frequency inductor (4), the graphite induction heating equipment that graphite heating body (3) and last heat insulating board (2) are formed places on the radiation baffle (10), high-frequency inductor (4) is connected with high-frequency induction heating power (7) by coil, ceramic crucible (1) passes spill radiation baffle (10), the mesopore of graphite heating body (3) and last heat insulating board (2) is connected with following pull system (13), and above assembly placed vacuum chamber (9), it is characterized in that:
A. high-frequency inductor (4) is to be combined by two single turn high-frequency inductors that structure is identical, direction is opposite; A surface of single turn high-frequency inductor is attenuate gradually from outside to inside, becomes the inclined-plane, and another surface is the plane; The plane of two single turn high-frequency inductors is fit together, formed inner conical high-frequency inductor (4); Between two single turn high-frequency inductors (4) that fit, insulation board (6) is arranged; High-frequency inductor (4) has the groove of opening circuit along radial direction;
B. the internal diameter of graphite heating body (3) one ends and external diameter all greater than the internal diameter and the external diameter of the other end, have formed big end and small end, and greatly the end and small end between 45 ° of oblique angle transition.
2. electromagnetic induction heater according to claim 1, the thickness that it is characterized in that the high-frequency inductor inner circle is 1/4 of cylindrical place thickness.
3. electromagnetic induction heater according to claim 1 is characterized in that the tooth shape place of coil inner conical cooperates with the outer wall of graphite heating body (3) small end.
4. electromagnetic induction heater according to claim 1 is characterized in that the gap of possessing 1.5～2mm between inwall, spill radiation baffle (10) inwall and the same ceramic crucible of last heat insulating board (2) inwall (1) of graphite heating body (3) small end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200297323U CN201234368Y (en) | 2008-07-25 | 2008-07-25 | Electromagnetic induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200297323U CN201234368Y (en) | 2008-07-25 | 2008-07-25 | Electromagnetic induction heating device |
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| Publication Number | Publication Date |
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| CN201234368Y true CN201234368Y (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200297323U Expired - Fee Related CN201234368Y (en) | 2008-07-25 | 2008-07-25 | Electromagnetic induction heating device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101636015B (en) * | 2008-07-25 | 2013-01-16 | 西北工业大学 | High temperature gradient low melt flow electromagnetic induction heating device |
| CN102927815A (en) * | 2012-11-08 | 2013-02-13 | 哈尔滨工业大学 | Suspension type cold crucible continuous melting and casting and directional solidification device |
| CN103017337A (en) * | 2013-01-17 | 2013-04-03 | 中国科学院上海应用物理研究所 | High-frequency induction fluid heater |
| CN103008579A (en) * | 2012-12-28 | 2013-04-03 | 哈尔滨工业大学 | Continuous casting and directional solidification method of titanium aluminum alloy suspended cold crucible |
| CN111154996A (en) * | 2020-03-02 | 2020-05-15 | 辽宁工业大学 | Preparation method and device of titanium-aluminum alloy gamma-TiAl |
-
2008
- 2008-07-25 CN CNU2008200297323U patent/CN201234368Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101636015B (en) * | 2008-07-25 | 2013-01-16 | 西北工业大学 | High temperature gradient low melt flow electromagnetic induction heating device |
| CN102927815A (en) * | 2012-11-08 | 2013-02-13 | 哈尔滨工业大学 | Suspension type cold crucible continuous melting and casting and directional solidification device |
| CN102927815B (en) * | 2012-11-08 | 2015-01-07 | 哈尔滨工业大学 | Suspension type cold crucible continuous melting and casting and directional solidification device |
| CN103008579A (en) * | 2012-12-28 | 2013-04-03 | 哈尔滨工业大学 | Continuous casting and directional solidification method of titanium aluminum alloy suspended cold crucible |
| CN103008579B (en) * | 2012-12-28 | 2014-12-03 | 哈尔滨工业大学 | Continuous casting and directional solidification method of titanium aluminum alloy suspended cold crucible |
| CN103017337A (en) * | 2013-01-17 | 2013-04-03 | 中国科学院上海应用物理研究所 | High-frequency induction fluid heater |
| CN103017337B (en) * | 2013-01-17 | 2014-11-26 | 中国科学院上海应用物理研究所 | High-frequency induction fluid heater |
| CN111154996A (en) * | 2020-03-02 | 2020-05-15 | 辽宁工业大学 | Preparation method and device of titanium-aluminum alloy gamma-TiAl |
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Granted publication date: 20090506 Termination date: 20110725 |