CN111385932A - Electromagnetic induction heating coil and heating device for isothermal biaxial tension test - Google Patents
Electromagnetic induction heating coil and heating device for isothermal biaxial tension test Download PDFInfo
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- CN111385932A CN111385932A CN201811653763.0A CN201811653763A CN111385932A CN 111385932 A CN111385932 A CN 111385932A CN 201811653763 A CN201811653763 A CN 201811653763A CN 111385932 A CN111385932 A CN 111385932A
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- coil body
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/42—Cooling of coils
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- General Induction Heating (AREA)
Abstract
The invention discloses an electromagnetic induction heating coil for an isothermal biaxial tension test, which comprises a conductive heating wire, wherein the middle part of the conductive heating wire is wound by a plurality of circles around the same center to form a head part of a coil body, two ends of the conductive heating wire respectively extend towards the direction vertical to the end surface of the head part to form a tail part of the coil body, the end surface of the head part is square, the tail part is rod-shaped, a gap is arranged between the circles of the head part, and the length of the outermost circle edge of the head part is larger than the length of the side of the central area of a cross metal plate to be subjected to the tension test. The electromagnetic induction heating coil and the heating device can be used for locally and accurately heating the central area of the cross metal plate, and effectively prevent the cross metal plate from losing efficacy.
Description
Technical Field
The invention relates to the field of mechanical property testing of sheet metal materials, in particular to an electromagnetic induction heating coil and a heating device for an isothermal biaxial tension test.
Background
The biaxial tension test is commonly used for obtaining the yield locus of a metal sheet material, and in order to ensure that an accurate yield locus is obtained, the central area of a cross biaxial tension metal sheet test piece in the test process should be kept at a uniform constant temperature, so that the influence of different mechanical properties of the metal sheet material at different temperatures on the result is avoided. At present, in a biaxial tension test, a constant temperature box is usually adopted to heat a metal sheet test piece, and the temperature of a clamping end of the metal sheet test piece is easily overhigh when the metal sheet test piece is heated, so that the test piece fails.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an electromagnetic induction heating coil and a heating device for isothermal biaxial tension test, which can locally and precisely heat the central region of a cross-shaped metal plate, thereby effectively preventing the cross-shaped metal plate from failing.
In order to achieve the above and other related objects, the present invention provides an electromagnetic induction heating coil for isothermal biaxial tension test, including a conductive heating wire, the middle of the conductive heating wire is wound around the same center for several turns to form a head of a coil body, two ends of the conductive heating wire respectively extend in a direction perpendicular to the end surface of the head to form a tail of the coil body, the end surface of the head is square, the tail is rod-shaped, a gap is formed between the turns of the head, and the outermost turn of the head is longer than the length of the side of the central area of the cross metal plate to be subjected to the tension test.
Optionally, the cross section of the conductive heating wire is square.
Optionally, the length of the side of the cross section of the head of the coil body is 50-65 mm, and the length of the side of the central area of the cross-shaped metal plate is 45 mm.
Optionally, the size of the gap is 2-5 mm, and the side length of the cross section of the conductive heating wire is 4-8 mm.
The invention also provides a heating device, which comprises a bracket, a guide piece and the electromagnetic induction heating coil, wherein the coil body is arranged on the bracket through the guide piece, and is connected with a power supply system of the heating device through a lead.
Optionally, the support includes pole setting and crossbeam, crossbeam fixed mounting be in on the pole setting, and fixed mounting has the fixing base on the crossbeam, the guide passes through the fixing base to be installed on the support.
Optionally, the support further comprises a vertical adjusting mechanism and a horizontal adjusting mechanism, the vertical adjusting mechanism is mounted on the fixed seat, the horizontal adjusting mechanism is mounted on the vertical adjusting mechanism, and the guide piece is mounted on the horizontal adjusting mechanism.
Optionally, the guide member includes a guide sleeve, the tail of the coil body passes through the guide sleeve and is fixed, and the center of the coil body coincides with the axis of the guide sleeve.
Optionally, the distance between the coil body and the cross metal plate is 14 mm.
Optionally, the clamping end of the cross-shaped metal plate is further connected with a cooling device.
When the electromagnetic induction heating coil and the heating device are used for heating the cross-shaped metal plate, the rapid heating of the workpiece can be realized by means of a mechanism that a high-frequency alternating magnetic field induced by high-frequency alternating current generates eddy currents in the workpiece, and the local heating of the central area of the cross-shaped metal plate can be realized, so that the phenomenon that the clamping end of the cross-shaped metal plate is too high in temperature is effectively prevented, and the failure of the test piece is avoided.
Drawings
FIG. 1 is a front view of the coil body of the present invention;
FIG. 2 is a rear view of the coil body of the present invention;
FIG. 3 is a right side view of the coil body of the present invention;
FIG. 4 is a schematic view of the heating apparatus of the present invention;
FIG. 5 is a schematic structural view of the stent of the present invention;
FIG. 6 is a cross-sectional view A-A of FIG. 5;
FIG. 7 is a schematic view of the construction of the guide sleeve of the present invention;
FIG. 8 is a schematic view of the connection of the guide sleeve of the present invention to the coil body;
FIG. 9 is a schematic structural view of a cooling block of the present invention;
FIG. 10 is a schematic structural view of a cross-shaped metal plate of the present invention;
fig. 11 is a schematic diagram showing the temperature distribution in the central area of the cross-shaped metal plate at different distances from the heating device according to the present invention.
Detailed Description
The invention will be further explained by the description of the embodiments with reference to the drawings.
As shown in fig. 1 to 3, the present invention discloses an electromagnetic induction heating coil for isothermal biaxial tension test, comprising a conductive heating wire, wherein the middle portion of the conductive heating wire is wound around the same center for several turns to form a head portion 101 of a coil body 1, two ends of the conductive heating wire respectively extend in a direction perpendicular to a heating end surface of the head portion 101 to form a tail portion 102 of the coil body 1, two ends of the conductive heating wire forming the tail portion 102 of the coil body 1 are located at the same side of the head portion 101 so as to be connected with a power supply system 8 of a heating device, and when the coil body 1 is connected with the power supply system 8, two ends of the conductive heating wire as the tail portion 102 of the coil body 1 are respectively connected with a wire and then connected with the power supply system 8.
As shown in fig. 1 and 3, in the present embodiment, the heating end surface of the head 101 of the coil body 1 is square, the tail 102 is rod-shaped, and a gap is formed between the rings of the head 101, and the gap may be, for example, 2-5 mm, so as to facilitate increasing the heat radiation of the head 101 of the coil body 1 to the cross metal plate 2, thereby increasing the heating efficiency of the coil body 1 to the cross metal plate 2. In this embodiment, when the conductive heating wire is selected, the cross section of the conductive heating wire may be, for example, a square, and the side length of the cross section may be, for example, 4 to 8 mm.
In the present embodiment, in order to increase the heating speed of the coil body 1 to the central area of the cross metal plate 2, the length of the outermost circle of the head 101 of the coil body 1 may be greater than the length of the central area of the cross metal plate 2 to be subjected to the tensile test, for example, in the present embodiment, the length of the central area of the cross metal plate 2 may be, for example, 45mm, and the length of the heating end surface of the head 101 of the coil body 1 may be, for example, 50 to 65 mm.
In the present embodiment, when the central area of the cross metal plate 2 is heated to the target temperature of 150 ℃, under the same distance condition, the distance between the head 101 of the coil body 1 and the cross metal plate 2 in the present embodiment may be, for example, 14mm, when the length of the heating end face side of the head 101 of the coil body 1 is 50mm, the coil body 1 heats the central area of the cross metal plate 2 to 150 ℃ for 260 seconds, and when the length of the heating end face side of the head 101 of the coil body 1 is 60mm, the coil body 1 heats the central area of the cross metal plate 2 to 150 ℃ for only 30 seconds. Since the distribution of the induced magnetic field generated by the coil body 1 is similar to the shape of the head 101 of the coil body 1, the distribution of the eddy current generated by the induced magnetic field is also related to the shape of the head 101 of the coil body 1, and the distribution of the eddy current excited by the head 101 of the coil body 1 is similar to the shape of the central area of the cross metal plate 2, so that the heating effect is improved, and the intensity of the excited eddy current is increased along with the increase of the size of the heating end surface of the head 101 of the coil body 1 in the embodiment, the more joule heat is generated, and the heating time is reduced. However, the size of the heating end face of the head 101 of the coil body 1 cannot be infinitely increased, and after the heating end face of the head 101 of the coil body 1 can ensure that the heating end face completely covers the central area of the cross-shaped metal plate 2, the temperature of the clamping end of the cross-shaped metal plate 2 is increased along with the increase of the size of the heating end face of the head 101 of the coil body 1, which is not favorable for experiments.
The electromagnetic induction heating coil for the isothermal biaxial tension test can effectively enable the central area of the cross-shaped metal plate 2 to reach uniform and stable target temperature during the biaxial tension test, thereby obtaining the yield locus of the cross-shaped metal plate 2 at the target temperature.
As shown in fig. 4, when the electromagnetic induction heating coil of the present invention is mounted on a heating apparatus, the coil body 1 is fixedly mounted by the holder 3 and the guide 4 (see fig. 5). Wherein, the coil body 1 is installed on the bracket 3 through the guiding piece 4, and the coil body 1 is connected with the power supply system 8 of the heating device through a lead. It should be noted that fig. 4 only schematically shows the relative connection relationship of the portions, and does not represent the actual structure of the portions.
In this embodiment, as shown in fig. 5, the bracket 3 includes an upright 301 and a cross beam 302, the cross beam 302 is fixedly mounted on the upright 301, the cross beam 302 is fixedly mounted with a fixing seat 304, and the guide 4 is mounted on the bracket 3 through the fixing seat 304. By moving the carriage 3, the head 101 of the coil body 1 is brought close to the central area of the cross metal plate 2.
As shown in fig. 5 and 6, the bracket 3 in this embodiment further includes a vertical adjustment mechanism 305 and a horizontal adjustment mechanism 303, the vertical adjustment mechanism 305 is fixedly mounted on a fixed seat 304, and includes, for example, a vertically arranged lead screw and a first slide base 306 in threaded engagement with the lead screw, and the horizontal adjustment mechanism 303 includes, for example, a lead screw horizontally mounted on the first slide base 306 and a second slide block 307 in threaded engagement with the lead screw. The horizontal adjusting mechanism 303 and the vertical adjusting mechanism 305 are perpendicular to each other, the guide 4 is mounted on the second sliding base 307, the horizontal adjusting mechanism 303 drives the guide 4 to move in the horizontal direction, and the vertical adjusting mechanism 305 drives the guide 4 to move in the vertical direction, so that the guide 4 can form a two-dimensional coordinate system on the support 3, and the position relation between the head 101 of the coil body 1 and the cross metal plate 2 can be accurately adjusted.
As shown in fig. 7 and 8, in the present embodiment, the guide member 4 includes a guide sleeve, the tail portion 102 of the coil body 1 is installed in the guide sleeve, the center of the coil body 1 coincides with the axis of the guide sleeve, the insulating layers 11 may be disposed between the guide sleeve and the tail portion 102 of the coil body 1, between the tail portion 102 penetrating the guide sleeve and on the periphery of the guide sleeve, and a filling member (e.g., filling cotton) is disposed between the tail portion 102 of the coil body 1 and the guide sleeve to support the tail portion 102 of the coil body 1.
In this embodiment, the clamping end of cross metal sheet 2 still is connected with cooling block 5, and cooling block 5 can adopt for example heat conduction metal material to make, and cooling block 5 passes through pipe 6 to be connected with heating device's cooling water tank 7, and circulation supply cooling water through cooling water tank 7 cools down the clamping end of cross metal sheet 2, can effectually prevent that the clamping end of cross metal sheet 2 from rising temperature. Specifically, as shown in fig. 9, the center of the cooling block 5 has a water inlet 501 and a water outlet 502 with opposite ends, and the water inlet 501 and the water outlet 502 are connected to the cooling water tank 7 through the conduit 6. In the present embodiment, in the same cooling line, two cooling blocks 5 are provided so as to cool down both sides of the clamping end of the cross-shaped metal plate 2 at the same time, and the two cooling blocks 5 in the same cooling line are connected in series through the conduit 6.
In addition, in this embodiment, a thermocouple 9 is further installed in the central area of the cross metal plate 2, so as to collect the central temperature of the cross metal plate 2 at any time, the thermocouple 9 is connected with the power supply system 8 through a thermocouple transmitter 10, meanwhile, the power supply system 8 of this embodiment adopts a closed-loop control system, when the thermocouple transmitter 10 outputs a voltage signal to the power supply system 8, the power supply system 8 judges whether the voltage value exceeds a preset value, if so, the output power is reduced, the temperature of the cross metal plate 2 is reduced, and if the voltage value is lower than the preset value, the output power is maintained, and the temperature of the cross metal plate 2 is increased.
In testing, the present example selects several specific distances to perform the test: in a specific test, the test parameters are shown in table 1.
TABLE 1
The results of the experiment are shown in FIG. 11.
The four vertexes of the central area of the cross-shaped metal plate 2 are located at the boundaries of the test piece, and heat exchange with air is easy to perform, so that heating to a target temperature is more difficult, and therefore, the diagonal direction of the central area is taken to determine whether the temperature field distribution is uniform.
As the distance between the coil body 1 and the cross-shaped metal plate 2 increases, the temperature field distribution on the cross-shaped metal plate 2 becomes more uniform, and the temperature on the corners of the cross-shaped metal plate 2 becomes higher and higher. When the distance between the coil body 1 and the cross metal plate 2 is 14mm, the maximum temperature of the central area of the cross metal plate 2 is 152 ℃, the minimum temperature is 145 ℃, and the difference value between the maximum temperature and the target temperature is 150 ℃ is 3.3%, and at this time, the temperature distribution of the central area of the cross metal plate 2 can be considered to meet the test requirements.
When the electromagnetic induction heating coil and the heating device are used for heating the cross metal plate 2, the rapid heating of the workpiece can be realized by means of a mechanism that a high-frequency alternating magnetic field induced by high-frequency alternating current generates eddy currents in the workpiece, and the local heating of the central area of the cross metal plate 2 can be realized, so that the phenomenon that the clamping end of the cross metal plate 2 is too high in temperature is effectively prevented, and the failure of a test piece is avoided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The electromagnetic induction heating coil for the isothermal biaxial tension test is characterized by comprising a conductive heating wire, wherein the middle of the conductive heating wire is wound around the same center for a plurality of circles to form a head of a coil body, two ends of the conductive heating wire extend in the direction perpendicular to the end face of the head respectively to form a tail of the coil body, the end face of the head is square, the tail is rod-shaped, a gap is reserved between the circles of the head, and the length of the outermost circle of the head is larger than that of the side length of the central area of a cross metal plate needing to be subjected to the tension test.
2. The electromagnetic induction heating coil for isothermal biaxial tension test as set forth in claim 1, characterized in that the cross section of the conductive heating wire is square.
3. The electromagnetic induction heating coil for the isothermal biaxial tension test according to claim 1, wherein the length of the side of the cross section of the head of the coil body is 50-65 mm, and the length of the side of the central area of the cross-shaped metal plate is 45 mm.
4. The electromagnetic induction heating coil for the isothermal biaxial tension test according to claim 1, characterized in that the size of the gap is 2 to 5mm, and the length of the cross-sectional side of the conductive heating wire is 4 to 8 mm.
5. A heating apparatus comprising a support, a guide, and the electromagnetic induction heating coil according to any one of claims 1 to 4, wherein the coil body is mounted on the support through the guide, and the coil body is connected to a power supply system of the heating apparatus through a wire.
6. A heating device as claimed in claim 5, wherein the support comprises an upright and a beam, the beam being fixedly mounted on the upright and a holder being fixedly mounted on the beam, the guide being mounted on the support via the holder.
7. The heating device of claim 6, wherein the bracket further comprises a vertical adjustment mechanism mounted on the fixed base and a horizontal adjustment mechanism mounted on the vertical adjustment mechanism, the guide being mounted on the horizontal adjustment mechanism.
8. The heating device of claim 5, wherein the guide member comprises a guide sleeve through which a tail portion of the coil body is passed and fixed, and a center of the coil body coincides with an axis of the guide sleeve.
9. The heating device according to claim 5, wherein a spacing between the coil body and the cross metal plate is 14 mm.
10. The heating device of claim 5, wherein a cooling device is further connected to the clamping end of the cross-shaped metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653763.0A CN111385932A (en) | 2018-12-29 | 2018-12-29 | Electromagnetic induction heating coil and heating device for isothermal biaxial tension test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653763.0A CN111385932A (en) | 2018-12-29 | 2018-12-29 | Electromagnetic induction heating coil and heating device for isothermal biaxial tension test |
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| Publication Number | Publication Date |
|---|---|
| CN111385932A true CN111385932A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811653763.0A Pending CN111385932A (en) | 2018-12-29 | 2018-12-29 | Electromagnetic induction heating coil and heating device for isothermal biaxial tension test |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2713771Y (en) * | 2004-07-02 | 2005-07-27 | 韩秀艳 | Electromagnetic induction heating coil |
| CN102595668A (en) * | 2011-12-31 | 2012-07-18 | 万宇 | Induction cooker coil disk and cooker |
| CN202949583U (en) * | 2012-10-26 | 2013-05-22 | 万宇 | Coil panel of induction cooker |
| CN103731946A (en) * | 2014-01-16 | 2014-04-16 | 任长学 | Radio-frequency heating method and device |
| WO2015136927A1 (en) * | 2014-03-11 | 2015-09-17 | Thk株式会社 | Heat-treatment device and heat-treatment method |
| US10701769B2 (en) * | 2013-05-14 | 2020-06-30 | Thermatool Corp. | Induction coil with dynamically variable coil geometry |
-
2018
- 2018-12-29 CN CN201811653763.0A patent/CN111385932A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2713771Y (en) * | 2004-07-02 | 2005-07-27 | 韩秀艳 | Electromagnetic induction heating coil |
| CN102595668A (en) * | 2011-12-31 | 2012-07-18 | 万宇 | Induction cooker coil disk and cooker |
| CN202949583U (en) * | 2012-10-26 | 2013-05-22 | 万宇 | Coil panel of induction cooker |
| US10701769B2 (en) * | 2013-05-14 | 2020-06-30 | Thermatool Corp. | Induction coil with dynamically variable coil geometry |
| CN103731946A (en) * | 2014-01-16 | 2014-04-16 | 任长学 | Radio-frequency heating method and device |
| WO2015136927A1 (en) * | 2014-03-11 | 2015-09-17 | Thk株式会社 | Heat-treatment device and heat-treatment method |
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Application publication date: 20200707 |
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