JP4115904B2 - Induction heating apparatus and induction heating method for thin plate article - Google Patents

Description

  The present invention relates to an apparatus and method for induction heating an article made of a thin metal plate with a high-frequency current, and can be used for induction heating, for example, for quenching a thin article constituting a vehicle body of a vehicle. It is.

  A member for constituting a vehicle body of a vehicle and produced using a thin plate as a material has a strength to ensure sufficient strength at the time of collision, such as a reinforcing member for a center pillar. The increased strength portion is provided in an elongated shape, and the strength portion is formed by quenching a predetermined region of the thin plate article. In this way, when heating a predetermined area to quench a part of a thin article, in the slow heating, the area to be heated is expanded by heat transfer during heating, so that only the predetermined area is concentrated to a predetermined temperature. Therefore, it is difficult to raise the temperature rapidly, and therefore, an induction heating method capable of rapidly heating only a predetermined region is a suitable heating method.

  As this induction heating method, there are a moving heating method shown in the following Patent Document 1 and a batch heating method shown in the following Patent Document 2. In the moving heating method, the entire area of the heated area is heated sequentially by moving the induction part of the local heating inductor, which is energized with a high-frequency current, with respect to the thin plate article. An induced current is generated in the local region of the thin article through which the part has passed, and the temperature of the local region heated by this induced current is a temperature corresponding to the amount of heat input in this local region and the moving speed of the induction acting part. In the batch heating method, the induction working part of the inductor is arranged to face one or a plurality of heated regions defined in the thin article, and the high frequency current fed from the power supply device receives the induction working part of the inductor. By being energized, the entire area of one or a plurality of heated regions is simultaneously induction-heated by an induced current generated by this high-frequency current.

Among these moving heating methods and batch heating methods, according to the moving heating method, the heated region that can be defined in the thin plate article is limited to one having a constant width in the longitudinal direction. In addition, it is impossible to define a tapered region, and it takes time to heat one thin article, and it is difficult to efficiently perform the heating operation. For this reason, the batch heating system which does not cause such a problem is excellent.
Japanese Patent Laid-Open No. 10-17933 (paragraph number 0042, FIG. 4) JP 2000-256733 (paragraph number 0045, FIGS. 1 and 2)

  However, even the batch heating method has the following problems.

  That is, as shown in FIG. 21, an elongated heating area 501 indicated by hatching is defined in the thin article 500, and the inductor has a size that covers the entire area of the heating area 501. Inductive action part of this is arranged opposite to heated area 501, and a high-frequency current fed from the power supply device is supplied to the induced action part of the inductor, and heated area 501 is heated by the induced current generated by this energization. Then, the flow path through which the induced current flows is generated in the form 502 shown in FIG. 21. For this reason, the heat input is uniformized over the entire area to be heated 501 including the end in the longitudinal direction. In addition, the cancellation between the reciprocating currents becomes larger or smaller, and the heat input efficiency is reduced. The cause of this phenomenon is that the article 500 in which the heated region 501 is defined is made of a thin plate, so that the induced current does not circulate in a vortex in the thickness direction of the thin plate article 500. This is because it circulates only in the plane of the thin article 500.

  In addition, when the induction portion of the inductor is made longer than the heated region 501, the induced current is likely to reach both ends of the elongated heated region 501, but instead, at both ends. Due to a new non-uniform factor of overheating, it is not possible to make the heat input uniform over the entire heated region 501 and the heat input efficiency is not improved.

  That is, the conventional batch heating method has not been sufficiently satisfactory in terms of both heat input uniformity and heat input efficiency.

  The object of the present invention is to cause the flow path of the induced current in the thin article to be concentrated in the heated area, so that the heat input in the heated area can be made uniform and the heat input efficiency can be improved. The present invention provides an induction heating apparatus and an induction heating method.

  The present invention includes a first induction heating device and a first induction heating method for a case where there is only one elongate heated region defined in a thin plate article and induction-heated by one inductor, There is a second induction heating device and a second induction heating method when present.

  A first induction heating device according to the present invention includes an induction action unit that faces one heated region defined in an elongated shape in a thin article, and the induction action unit is energized with a high-frequency current. Induction of an article made of a thin plate comprising one inductor for simultaneously inductively heating the entire area of one heated region, and a power supply device for supplying a high-frequency current to the induction operating portion of the inductor The heating apparatus includes a conductive member for connecting one end and the other end of the one heated region.

  In the first induction heating method according to the present invention implemented by the first induction heating device, the induction working portion of one inductor is opposed to one heated region defined in a thin shape in a thin article. And a work step for simultaneously inductively heating the entire area of the one heated region by applying a high-frequency current to the induction working portion of the one inductor. A heating method comprising: a work step of forming a circulation circuit by connecting one end and the other end of the one heated region with a conductive member; and a high-frequency current in the induction acting portion of the inductor In this manner, induction heating is performed on the entire area of the one heated region in such a manner that the induced current generated in the one heated region is circulated through the circulation circuit as a flow path. A work performing sometimes is characterized in that it contains.

  Further, the second induction heating device according to the present invention includes an induction action portion facing a plurality of heated regions, each of which is defined in a thin shape on a thin article, and a high frequency current is passed through the induction action portion. A thin plate comprising: one inductor for simultaneously inductively heating the whole of the plurality of heated regions, and a power supply device that supplies a high-frequency current to the induction working portion of the inductor. An induction heating device for a manufactured article, wherein the plurality of heated regions are connected in series following a current flow path by the induction acting portion of the one inductor, and the first conductive member, Of the plurality of heated regions, a second conductive member for connecting a start end of the heated region located on the start end side in the current flow path and a terminal end of the heated region located on the end side And characterized by having Than is.

  The second induction heating method according to the present invention implemented by the second induction heating apparatus includes a plurality of heated regions in which an induction action portion of one inductor is defined by a thin article each in an elongated shape. And a work step of simultaneously inductively heating the whole area of the plurality of heated regions by applying a high-frequency current to the induction working portion of the one inductor. In this induction heating method, the plurality of heated regions are connected in series by a first conductive member along a current flow path by the induction acting portion of the one inductor, and the plurality of heated regions are also connected. By connecting the starting end of the heated region located on the start end side in the current flow path in the heating region and the terminating end of the heated region located on the end side by a second conductive member, a circulating electric circuit A plurality of heated regions having a mode in which a high-frequency current is applied to the inductor and an induction current generated in the plurality of heated regions is circulated and circulated using the circulation circuit as a flow path. And an operation step of simultaneously performing induction heating for the entire area of the above.

  According to the first induction heating device and the first induction heating method, and the second induction heating device and the second induction heating method described above, the thin plate article includes one or a plurality of heated regions and the conductive member. A circulation circuit in which the induction current circulates is formed, and the induction current generated in the heated area flows through the circulation circuit as a flow path. Therefore, in the thin article, the induction current flow path is heated. In other words, the cancellation between the above-described reciprocating currents is also eliminated, so that the heat input in the heated region can be made uniform and the heat input efficiency can be improved. become able to.

  In the second induction heating device and the second induction heating method, the circulation circuit formed by the plurality of heated regions and the first and second conductive members may be one, or may be two or more. When there are a plurality of circulation electric circuits, these circulation electric circuits may be independent from each other, may have a common heated area, and may partially overlap in the heated area.

  Further, in the first induction heating device and the first induction heating method, and the second induction heating device and the second induction heating method, the conductive member may have rigidity that does not deform, but for example, a flexible cable or a spring material As described above, it is preferable to have a deformability. If the conductive member has a deformable shape such as flexibility, the heated region is heated, and even if distortion due to this heating occurs in the thin plate article, the conductive material connected to the end of the heated region. By deforming the member, the member follows the distortion, and the conductive member does not cause an unfavorable restraining force to the thin article having the heated region.

  Further, the conductive member may be a member only for forming the circulation electric circuit, but it is made a conductive member by utilizing any means required in relation to the thin plate article itself or a member constituting this means. It is preferable. For example, the transport means for transporting a thin plate article to a heating place by an induction heating device or the like, or a component member of this transport means is used as a conductive member, or a thin plate article is used in a heating place by an induction heating device. The support means for supporting itself or a constituent member of the support means is used as a conductive member. As described above, if the conveying means, the supporting means themselves, and the constituent members of these means also serve as conductive members, it is possible to avoid difficulty in securing a space and increasing the cost caused by newly introducing the conductive members. Become.

  Moreover, it is preferable that the induction | guidance | derivation action part of the inductor which opposes the to-be-heated area | region of thin-plate articles has the length extended outside the to-be-heated area | region beyond the edge part of to-be-heated area | region. According to this, the induced current is prevented from detouring in the thin plate at the end of the heated region, and the concentration of the induced current in the heated region can be thoroughly carried out to the end of the heated region. it can.

  Furthermore, in order to connect the conductive member to the end of the heated region, a pressing tool that is pressed against and contacted with the end of the heated region may be provided at the end of the conductive member. It is preferable that a clamping tool for clamping the thin plate article is provided at the end portion of the conductive member at the end portion of the conductive member, and the conductive member can be attached to and detached from the thin plate article with this clamping tool. According to this, the conductive member is reliably connected to the heated region by the clamping force of the clamping tool, and the conductive member can be easily attached to and detached from the thin article.

  In the above, the elongate heated region defined in the thin article may have a constant width in the longitudinal direction, such as a divergent shape or a tapered shape toward one end, The width may gradually change in the longitudinal direction, such as a shape in which both ends are widened or a shape in which both ends are tapered. The induction operating portion of the inductor disposed opposite to the heated region is formed in a shape corresponding to such a heated region and having a size that can cover the entire heated region. .

  In addition, the induction acting part may cover the entire width of the heated area with a single good conductor, but covers the entire width of the heated area with a single good conductor as in the case where the width of the heated area is large. If this is not possible, the entire width of the heated region may be covered by arranging a plurality of good conductors in parallel.

  In addition, when the width of the heated region is large or the like, from the good conductor extending from one end of the heated region to the other end while bending zigzag in the width direction of the heated region. A zigzag electric circuit may be provided, and a high-frequency current may be supplied to the zigzag electric circuit.

  Further, when three or more heated regions are defined in one thin plate article, the first induction heating device and the first induction heating method described above applied to one heated region, You may use together the 2nd induction heating apparatus and 2nd induction heating method which were mentioned above applied to a to-be-heated area | region.

  Further, in the second induction heating apparatus and the second induction heating method, by making the number of induction working portions provided in the inductor the same as the number of heated regions, one induction working portion is provided in one heated region. Alternatively, the number of induction acting portions may be different from the number of heated regions by making the number of induction acting portions different from each other, or a plurality of induction acting portions may be opposed to one heated region. One induction acting part common to the heated area may be confronted.

  Further, in the present invention, the thin plate of the thin plate article refers to a plate material having a thickness in which an induced current hardly occurs in the thickness direction, and this thickness is 3.2 mm or less, and more narrowly 2.3 mm or less. It is.

  Further, the material of the thin plate article may be a metal that generates an induced current by a high-frequency current, for example, various steel plates (including high-tensile steel plates) having different carbon contents, such as ferrite, austenite, and martensite. An alloy steel plate such as a stainless steel plate or a non-ferrous metal plate may be used. Further, the thin plate article may be subjected to a surface treatment such as galvanization at the material or product stage.

  In addition, the present invention can be applied when heating an article having a predetermined shape by press-molding a thin plate in order to perform quenching or the like, and also heat an article having a flat shape as a thin plate. It can also be applied to cases. Further, after heating an article having a flat shape as it is thin, it may be formed into a predetermined shape by press molding or the like, and quenched by heating after cooling an article having a flat shape as a thin plate. Thereafter, it may be formed into a predetermined shape by press molding or the like.

  Furthermore, the thin plate article heated by the induction heating apparatus and the induction heating method according to the present invention may be used as a member of any machine, apparatus, or device, and an example thereof constitutes a vehicle body of a four-wheel vehicle. A reinforcing member for the center pillar, an impact beam of the door, a floor frame of the vehicle body, and a front side frame.

  According to the present invention, an induction current can be generated for induction heating of a thin plate article by concentrating the flow path in a heated area, and uniform heat input and improved heat input efficiency in the heated area. The effect that it can aim at is acquired.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. FIG. 1 is a schematic perspective view showing an embodiment in the case of induction heating a single elongated region 11 to be heated defined in a thin article 10, and FIG. 2 is a sectional view taken along line S2-S2 of FIG. It is.

  As shown in FIG. 1, on the thin article 10, one inductor 20 having an induction action portion 21 is disposed with an appropriate gap from the heated region 11, The induction working unit 21 facing the heated region 11 has an elongated shape that covers the entire heated region 11 and corresponds to the heated region 11. For this reason, the induction heating apparatus in this embodiment is a collective heating method in which the entire area of the heated region 11 can be induction-heated simultaneously with the induction current when a high-frequency current is passed through the induction portion 21 of one inductor 20. Has become.

  Both end portions 11A and 11B of the heated region 11 in this embodiment reach the edge portions 10A and 10B that are parallel to each other of the thin article 10 and the heated region that is the interval between the edge portions 10A and 10B. The length dimension L2 of the guide action part 21 is longer than the length dimension L1 of 11. For this reason, both end portions 21A and 21B of the guide action portion 21 extend beyond the edge portions 10A and 10B to the outside of the thin article 10. In other words, both end portions 21A and 21B of the guide action portion 21 are Further, it extends beyond both end portions 11A and 11B of the heated region 11 to the outside of these end portions 11A and 11B.

  The inductor 20 is connected to the high frequency power supply device 1 through the power supply cable 2, and a high frequency current is supplied from the power supply device 1 to the induction working unit 21. As shown in FIG. 2, the inductor 20 is formed of a hollow member, and a coolant supplied from the inlet 20 </ b> A shown in FIG. 1 and exits from the outlet 20 </ b> B circulates in the inductor 20. Heat generation of the induction portion 21 when a high-frequency current is supplied to 21 is suppressed.

  Further, under the thin article 10, a cooling pipe 3 is provided in which a cooling liquid is jetted after the entire heated area 11 is heated to a target temperature or higher, and the heated area 11 is formed by the ejection of the cooling liquid. The heated region 11 is quenched by being rapidly cooled.

  FIG. 3 is a plan view of the thin article 10 in which the guide action part 21 is indicated by an imaginary line by a two-dot chain line. One end of the conductive member 31 is connected to the end 11A of the heated region 11 reaching one edge 10A of the thin article 10 and reaches the other edge 10B of the thin article 10. The other end of the conductive member 31 is connected to the end 11 </ b> B of the heated region 11. Therefore, a circulation circuit that is a closed circuit is formed by the heated region 11 and the conductive member 31.

  The conductive member 31 is made of a flexible cable, and therefore the conductive member 31 can be deformed. Further, the ends 11 </ b> A and 11 </ b> B of the heated region 11 and the conductive member 31 are detachably attached by sandwiching tools provided at both ends of the conductive member 31. Specific examples of this clamping tool are shown in FIGS. 17 to 20 described later.

  In addition, although the thin plate article 10 has a planar shape in the drawing, it may be a three-dimensional shape that is press-molded or the like.

  When a high-frequency current is supplied from the power supply device 1 to the induction operating portion 21 of the inductor 20 for a predetermined time, an induction current is generated in the heated region 11 due to electromagnetic induction action, and the Joule heat due to the induced current causes the induction region 21 to be heated. Heat input is made. In this embodiment, a circulation circuit that allows an induced current to circulate and circulate is formed by one heated region 11 and one conductive member 31, and this circulation circuit has more current than other parts of the thin article 1. Since the electric circuit is easy to flow, the induced current is generally concentrated on this circuit.

  Thus, according to this embodiment, the induced current generated in the heated region 11 flows in a concentrated manner in the circulation circuit, in other words, the flow path through which the induced current flows concentrates in the heated region 11. Will occur. Then, the induction current generated in the heated region 11 is circulated using the circulation circuit as a flow path, and induction heating is performed on the entire heated region 11 at the same time. Since the entire area to be heated 11 can be made uniform, it is possible to raise the temperature of the area 11 to the target temperature as a whole by reducing temperature unevenness. Thereby, when the heated region 11 is quenched and quenched by the ejection of the cooling liquid from the cooling pipe 3, the strength and hardness of the heated region 11 obtained thereby are set to desired values or the entire region 11 It can be over the desired value.

  Further, in the circulation circuit, since cancellation between the reciprocating currents described with reference to FIG. 21 cannot occur, the heat input efficiency is improved as compared with the conventional batch heating method.

  FIG. 4 shows an embodiment in which the thin article 40 is defined with two elongated heated regions 41 and 42. The inductor 50 of this embodiment includes the same number of induction action portions 51 and 52 as the heated regions 41 and 42, and these induction action portions 51 and 52 are arranged to face the heated regions 41 and 42. It is installed. The inductor 50 includes induction acting portions 51 and 52 and a connecting portion 50A that connects the induction acting portions 51 and 52 in series. The inductor 50 follows the current flow path by the induction acting portions 51 and 52 of the inductor 50. One end portions 41A and 42A of the two heated regions 41 and 42 reaching the one edge portion 40A of the thin article 40 so that the two heated regions 41 and 42 are connected in series, The first conductive members 61 are connected.

  The other end portions 41B and 42B of the two heated regions 41 and 42 reaching the other edge portion 40B of the thin plate article 40 are connected by a second conductive member 62. In other words, of the two heated regions 41 and 42, the heated region 41 is located at the start end 41B located on the start end side in the current flow path by the induction acting portions 51 and 52 of the inductor 50, and located at the end side. The terminal portion 42 </ b> B of the heated region 42 is connected by the second conductive member 62.

  For this reason, in this embodiment, the circulation through which the induced current generated in the heated regions 41 and 42 is circulated by the two heated regions 41 and 42 and the first and second conductive members 61 and 62, respectively. An electric circuit is formed. Since the induced current flows through the circulation circuit in a concentrated manner, the flow path through which the induced current flows can be concentrated in the heated regions 41 and 42 as in the above-described embodiment. The heat input can be made uniform and the heat input efficiency can be improved.

  FIG. 5 shows an embodiment in which three elongate heated regions 71 to 73 are defined in the thin article 70, and the number of inductors 80 in this embodiment is the same as the heated regions 71 to 73. Induction action portions 81 to 83 are provided, and these induction action portions 81 to 83 are opposed to the heated regions 71 to 73. The inductor 80 is formed of induction action portions 81 to 83 and connecting portions 80A and 80B that connect these induction action portions 81 to 83 in series, and the current flow by the induction action portions 81 to 83 of the inductor 80. The end portions 71B and 72B of the two heated areas 71 and 72 adjacent to each other are connected by the first conductive member 91 so that the three heated areas 71 to 73 are connected in series along the feeding path. In addition, the end portions 72A and 73A of the two heated regions 72 and 73 adjacent to each other are also connected by another first conductive member 92.

  Of the three heated regions 71 to 73, the starting end portion 71A of the heated region 71 located on the starting end side in the current flow path by the induction acting portions 81 to 83 of the inductor 80, and the covered portion positioned on the terminating end side. A terminal portion 73 </ b> B of the heating region 73 is connected by a second conductive member 93.

  For this reason, also in this embodiment, the circulation electric circuit through which the induced current circulates is formed by the three heated regions 71 to 73, the two first conductive members 91 and 92, and the one second conductive member 93. Will be formed.

  In the embodiment of FIG. 6 as well, three elongate heated areas 101 to 103 are defined in the thin article 100. However, since the width of the central heated region 102 is larger than the widths of the other heated regions 101 and 103, the inductor 110 in this embodiment includes four induction acting portions 111 to 114. These induction operation parts 111 to 114 are connected in series so as to form a current flow path. More specifically, the guiding action parts 111 and 112 are connected by a connecting part 110A, the guiding action parts 112 and 113 are connected by a connecting part 110B, and the guiding action parts 113 and 114 are connected by a connecting part 110C. Of the four induction action parts 111 to 114, the wide induction action part 102 is opposed to the first and third induction action parts 111 and 113 in the current flow path, and other heated regions. 101 and 104 are opposed to the second and fourth induction acting portions 112 and 114.

  One of these heated regions 101 and 102 is connected in series so that the two heated regions 101 and 102 adjacent to each other are connected in series following the current flow path by the induction acting portions 111 and 112 of the inductor 100. Are connected to each other by the first conductive member 121, and the two heated regions 102 and 103 adjacent to each other are also connected to the current flow path by the induction acting portions 113 and 114 of the inductor 100. One end portions 102 </ b> A and 103 </ b> A of these heated regions 102 and 103 are connected by another first conductive member 122 so as to be connected in series. The other end portions 101B and 102B of the heated regions 101 and 102 are connected by the second conductive member 123, and the other end portions 102B and 103B of the heated regions 102 and 103 are also another second conductive member. 124.

  For this reason, in this embodiment, the circulation electric circuit which consists of two to-be-heated area | regions 101 and 102 and one each 1st and 2nd electrically-conductive member 121,123, and two to-be-heated area | regions 102 and 103 and one each. The first and second conductive members 122 and 124 are formed as a circulation circuit, and these two circulation circuits have the wide heated region 102 as a common circuit. Yes.

  Also in this embodiment, the flow path through which the induced current generated in the heated areas 101 to 103 circulates can be concentrated in these heated areas 101 to 103, and the entire area of the heated areas 101 to 103 can be generated. Uniform heat input and improved heat input efficiency can be achieved.

  In the thin article 130 of the embodiment of FIG. 7, four elongate heated regions 131 to 134 are defined, and the inductor 140 has induction acting portions 141 to 144 facing these heated regions 131 to 134. The induction acting portions 141 to 144 are connected by the connecting portions 140A to 140C, so that the current flow path by the induction acting portions 141 to 144 is formed in the inductor 140. The first end portions 131A and 132A of the heated regions 131 and 132 are the first first conductive member 151 so that the four heated regions 131 to 134 are connected in series following the current flow path. And the other end portions 132B and 133B of the heated regions 132 and 133 are connected by the second first conductive member 152, and one end portion 133A of the heated regions 133 and 134 is connected. , 134A are connected by a third first conductive member 153.

  In addition, among the four heated regions 131 to 134, the start end portion 131B of the heated region 131 located on the start end side in the current flow path by the induction acting portions 141 to 144 of the inductor 140, and the covered portion located on the end side. The end portion 134 </ b> B of the heating region 134 is connected by the second conductive member 154.

  Thereby, in this embodiment, one circulation electric circuit is formed by the four to-be-heated areas 131 to 134, the three first conductive members 151 to 153, and the one conductive member 154.

  FIG. 8 shows an embodiment for forming two circulating circuits in the sheet article 130 of FIG. 7 in which four heated regions 131-134 are defined, and the inductor used in this embodiment is: This is the same as the inductor 140 of FIG.

  One end portions 131A and 132A of the two heated regions 131 and 132 adjacent to each other are the first conductive member 161, and one end portions 133A and 134A of the two adjacent heated regions 133 and 134 are adjacent to each other. Are connected to each other by the first conductive member 162, whereby the heated regions 131 and 132 and 133 and 134 are respectively connected to the current flow path by the induction action portions 141 and 142 of the inductor 140 and the induction action portions 143 and 144, respectively. They are connected in series following the current flow path. Further, of the two heated regions 131 and 132, the starting end portion 131B of the heated region 131 located on the starting end side in the current flow path by the induction acting portions 141 and 142 of the inductor 140, and the covered portion positioned on the terminal end side. The end portion 132B of the heating region 132 is connected by the second conductive member 163, and is located on the start end side in the current flow path by the induction acting portions 143 and 144 of the inductor 140 out of the two heated regions 133 and 134. The start end portion 133B of the heated region 133 to be heated and the end portion 134B of the heated region 134 located on the end side are connected by the second conductive member 164.

  Thereby, in this embodiment, two circulation electric circuits are formed in thin article 130.

  9 is similar to FIG. 8 by connecting the four heated regions 131 to 134 using the first conductive members 161 and 162 and the second conductive members 163 and 164 of FIG. The inductor 170 used in this embodiment is an embodiment in the case of forming one circulation electric circuit, and the order of the series connection of the four induction action parts 171 to 174 is the induction action part 141 of the inductor 140 of FIG. It is different from the order of series connection of ~ 144.

  That is, the induction action part 171 facing the heated area 131 and the induction action part 172 facing the heated area 132 are connected by the connecting part 170A so as to be connected in series in this order. The action part 172 and the induction action part 173 that faces the heated area 134 are connected by a connecting part 170B so as to be connected in series in this order, and the induction action part 173 and the heated area 133 face each other. The guiding action part 174 is connected by a connecting part 170C so as to be connected in series in this order.

  Even if the inductor 170 in which the four induction acting portions 171 to 174 are connected in this order is used, an induced current is generated in the four heated regions 131 to 134 provided in the thin article 130. The induced current can be circulated through the two circulation circuits.

  FIG. 10 also shows an embodiment in which four elongate heated regions 131 to 134 defined in the thin article 130 are induction-heated. In this embodiment, the four heated regions 131 to 134 are heated. Among them, one circulation circuit is formed by the two heated regions 132 and 133 at the center, and another circulation circuit is formed by the two heated regions 131 and 134 on the outside.

  That is, one end portions 132 </ b> A and 133 </ b> A of the heated regions 132 and 133 are connected by the first conductive member 191, and the other end portions 132 </ b> B and 133 </ b> B are connected by the second conductive member 192. Further, one end portions 131A and 134A of the heated regions 131 and 134 are connected by another first conductive member 193, and the other end portions 131B and 134B are connected by another second conductive member 194. Connected with. And the four induction | guidance | derivation action parts 181-184 of the inductor 180 which opposes the to-be-heated area | regions 131-134 are connected in series by the connection parts 180A-180C in this order.

  Also according to this embodiment, an induced current can be generated in the four heated regions 131 to 134, and this induced current can be circulated through two circulation circuits.

  In FIG. 11, like the induction action portions 51 and 52 of the inductor 50 shown in FIG. 4, two induction action portions 211 and 212 adjacent to each other of the inductor 210 are energized in opposite directions. An embodiment that can be applied to the above case will be described. In this embodiment, a ferromagnetic member 213 capable of converging a magnetic flux generated by a current supplied to the induction action portions 211 and 212 is disposed between the induction action portions 211 and 212.

  According to this, even when the distance between the guide action portions 211 and 212 is small, the flow path of the magnetic flux can be regulated so that the magnetic flux generated around the guide action portions 211 and 212 does not cancel each other and become invalid. In addition, a strong magnetic flux is generated in the flow path after the regulation due to a decrease in magnetic resistance, thereby ensuring a strong induced current in each of the two heated regions defined in the thin article 200. it can.

  FIG. 12 shows an embodiment applicable to the case where high-frequency currents in the same direction are passed through two induction acting portions 231 and 232 adjacent to each other of the inductor 230. In this embodiment, the guiding action portions 231 and 232, in other words, on the opposite side of the thin article 220 with respect to the guiding action portions 231 and 232, are strong so as to straddle these guiding action portions 231 and 232. A magnetic member 233 is provided.

  According to this, since the magnetic flux generated around the induction acting portions 231 and 232 is focused by the ferromagnetic member 233, an induced current is not generated in the thin plate article 220 for each of the two induction acting portions 231 and 232. The number of the heated regions provided in the thin article 220 for these induction acting portions 231 and 232 can be set to one wide, and an induced current can be generated in this one heated region.

  In this embodiment, high-frequency currents in the same direction as inductive action portions 172 and 174 of the inductor 170 of FIG. 9 and induction action portions 181 and 183 and 182 and 184 of the inductor 180 of FIG. There are two induction acting parts to be energized, and the distance between these induction acting parts is small. Therefore, as in the heated region 102 for the induction acting parts 111 and 113 of the inductor 110 in FIG. This is effective when an induction current is generated in one wide heated region provided on the thin article 220 by two induction acting portions.

  In the embodiment of FIG. 13, the width of the heated region 241 defined in the thin article 240 is large, or the heated region 241 extends from one edge 240 </ b> A to the other edge of the thin article 240 as illustrated. In this case, the width dimension gradually increases toward 240B.

  In this embodiment, the guide action portion 251 of the inductor 250 has a length that zigzags in the width direction of the heated region 241 and extends in the width direction of the heated region 241 and has one edge 240A of the thin article 240. A zigzag circuit 253 is formed by a good conductor 252 that gradually becomes longer from the other edge 240B toward the other edge 240B, and a high-frequency current is passed through the zigzag circuit 253. According to this, even if the shape of the heated region 241 is as described above, an induced current can be generated in the entire heated region 241 with a heat input capability according to the width dimension of the heated region 241. .

  In this embodiment, the number of the heated regions 241 is one, and the one end 241A and the other end 241B of the heated region 241 are connected by the conductive member 261 so that the circulation electric circuit is formed. The number of heated regions defined in the thin article is plural, and at least one of the heated regions has the same shape as the heated region 241 in FIG. Even when these heated regions are connected by the first conductive member and the second conductive member to form a circulation electric circuit, the zigzag electric circuit described above is used as the induction action portion of the inductor. It can be applied.

  14 to 16 show an embodiment in which a conductive member for forming a circulation circuit together with a heated region also serves as a constituent member of means used for induction heating of a thin article with an induction heating device. ing.

  The thin plate article 270 of FIG. 14 is transported to the induction heating work place by the suspended transport means 280. The conveying means 280 includes a pair of metal ropes 281 and 282 whose lower ends are detachably connected to the thin article 270, and a metal horizontal bar member in which the metal ropes 281 and 282 are suspended. 283, and the metal ropes 281 and 282 are connected in series via the horizontal bar 283, so that the metal ropes 281 and 282 are connected to the horizontal bar. Reference numeral 283 denotes a member that also serves as a conductive member for connecting both ends of the heated region 271.

  That is, in this embodiment, a circulation electric circuit is formed by the heated region 271 of the thin article 270, the metal strips 281 and 282, and the horizontal bar 283. Therefore, when the thin plate article 270 is suspended and conveyed by the conveying means 280 to the place where the induction heating apparatus is installed, and the induction heating work is started after the induction operating portion of the inductor is set in the heated area 271, the heated area The induced current generated in 271 circulates in the circulation circuit.

  The thin plate article 290 of FIG. 15 is set on the table 303 when induction heating is performed by an induction heating device. The table 303 is provided with a pair of rising support brackets 301 and 302, and the tips of these support brackets 301 and 302 are detachably connected to a thin article 290, and this connection is made. As a result, the thin article 290 is fixedly supported and set on the table 303. The support fittings 301 and 302 whose front ends are connected to both ends of the heated region 291 and the table 303 are support means 300 for immovably supporting the thin plate article 290 when the thin plate article 290 is induction-heated. It is the member which comprises.

  Since the table 303 is made of metal, a circulation electric circuit is formed by the heated region 291 of the thin article 290, the support fittings 301 and 302, and the table 303, and the induction working portion of the inductor is set in the heated region 291. When the induction heating operation is started, the induction current generated in the heated area 291 circulates and circulates in this circulation circuit.

  The thin plate article 310 of FIG. 16 is sent to the induction heating place where the induction heating device is installed by the slide conveying means 320. The slide conveying means 320 includes a metal moving bar 324 that reciprocates with a cylinder 323, and metal bars 321 and 322 that extend forward from the moving bar 324. The tips of the metal bars 321 and 322 are respectively The thin plate article 310 is detachably connected. These connections are made at the ends of the heated regions 311 and 321. When these connections are made and the cylinder 323 expands, the thin article 310 is sent to the induction heating work place where the induction heating device is installed. It is.

  Further, the ends of the heated regions 311 and 312 defined on the thin article 310 opposite to the metal bars 321 and 322 are connected to each other by a separate conductive member (not shown). For this reason, a circulation electric circuit is formed by the heated regions 311 and 312, the metal rods 321 and 322, the moving bar 323, and the separately provided conductive member, and the induction portion of the inductor in the heated regions 311 and 312. Is set and the induction heating operation is started, the induction current generated in the heated regions 311 and 312 circulates and circulates in this circulation circuit.

  According to the above-described embodiments of FIGS. 14 to 16, the metal ropes 281 and 282 that function as conductive members, the horizontal bar 283, the support fittings 301 and 302, the table 303, the metal bars 321 and 322, and the moving bar 324 are Since it is a member constituting the suspension conveyance means 280, the support means 300, and the slide conveyance means 320, it is not necessary to provide a member that functions only as a conductive member in these means 280, 300, and 320. Simplification and reduction of the number of parts.

  It should be noted that the horizontal bar 283 of the suspending and conveying means 280, the table 303 of the supporting means 300, and the moving bar 324 of the slide conveying means 320 are provided between the metal ropes 281 and 282, between the support fittings 301 and 302, and the metal bars 321 and 322. The horizontal bar 283, the table 303, and the moving bar 324 may be formed of an electrically insulating material by providing a conductive member provided therebetween.

  FIGS. 17 to 19 are provided at the end of the conductive member so that the end of the conductive member for forming the circulation circuit can be detachably connected to the thin plate article. The embodiment about the pinch tool for wearing is shown. The clamping tool shown by these embodiment can be used in order to connect the edge part of the electrically-conductive member in each embodiment demonstrated so far, and the edge part of a to-be-heated area | region.

  17 has a pair of sandwiching members 331 and 332 for sandwiching the thin article 340, and these sandwiching members 331 and 332 rotate around a shaft 333 when opened and closed. The thin article 340 is clamped by a closing force by a spring (not shown) wound around the shaft 333. Of the pair of sandwiching members 331 and 332, at least the sandwiching member 331 that hits one surface of the thin plate article is formed of a conductive material, and the conductive member 351 for forming the circulation circuit in the sandwiching member 331. Is connected.

  The sandwiching tool 330 sandwiches the thin plate article 340 at the end of the heated region 341 during the induction heating operation. After the induction heating operation, the sandwiching tool 330 is removed from the thin plate article 340, and the sandwiching tool 330 is removed. Wait for an induction heating operation of a thin article.

  18 also includes a pair of sandwiching members 361 and 362 for sandwiching the thin article 370. These sandwiching members 361 and 362 are similar to the sandwiching tool 330 in FIG. When the opening / closing operation is performed, the sheet 370 is rotated around the shaft 363 to open and close, and the thin plate article 370 is clamped by a closing force by a spring (not shown) wound around the shaft 363. Protrusions 361A and 362A projecting in directions facing each other are formed at the tips of the sandwiching members 361 and 362.

  For this reason, the end 371A of the heated region 371 defined in the thin article 370 does not reach the edge 370A of the thin article 370 and is formed of a conductive material even if there is a gap between them. The thin plate article 370 can be sandwiched by the sandwiching tool 360 while the projection 361A of the sandwiching member 361 is securely connected to the end 371A of the heated region 371, and the conductive material connected to the sandwiching member 361 is connected. A circulating electric circuit can be formed by the member 381.

  19 includes a C-shaped main body 391, a receiving member 392 fixed to the lower upper surface of the main body 391 and applied to the lower surface of the thin article 400, and an upper horizontal portion of the main body 391. And a contact member 394 rotatably attached to the lower end of the screw shaft 393.

  When the screw shaft 393 is rotated and rotated downward, the contact member 394 comes into contact with the upper surface of the thin plate article 400 so that the thin plate article 400 is sandwiched between the contact member 394 and the receiving member 392. The contact member 394 that contacts the end of the heated region defined on the upper surface of the thin article 400 is made of a conductive material, and a conductive member 411 for forming a circulation circuit in the contact member 394. Since the contact member 394 hits the end of the heated region, a circulation circuit is formed.

  Further, by reversely rotating the screw shaft 393, the clamping tool 390 is removed from the thin article 400, and this clamping tool 390 is put on standby for the induction heating operation for the next thin article.

  20 is fixed to the C-shaped main body 421 and the upper surface of the lower side of the main body 421 and is applied to the lower surface of the thin article 430, similarly to the sandwiching tool 390 of FIG. The hydraulic cylinder 423 is attached to the upper horizontal portion of the main body 421 downward, and the contact member 424 is attached to the tip of the piston rod 423A in which the hydraulic cylinder 423 advances and retreats.

  As the piston rod 423A advances and the contact member 424 hits the upper surface of the thin plate article 430, the thin plate article 400 is sandwiched between the contact member 424 and the receiving member 422. The contact member 424 is made of a conductive material, and since the contact member 424 is connected to a conductive member 441 for forming a circulation circuit, the contact member 424 hits the end of the heated region. Thus, a circulation electric circuit is formed.

  Since the main bodies 391 and 421 of the sandwiching tools 390 and 420 according to the embodiment of FIGS. 19 and 20 are C-shaped, the end of the heated region is the edge of the thin article 400 or 430 as in FIG. Even if it does not reach the portions 400A and 430A, the thin plate articles 400 and 430 can be sandwiched by the sandwiching tools 390 and 420 at the end of the heated region.

  In this way, even if the end of the heated area defined by the thin article does not reach the edge of the thin article, the conductive member is connected to the end of the heated area via the sandwiching tool. Thus, the flow path through which the induced current flows can be concentrated in the heated region, and the heat input in the heated region can be made uniform and the heat input efficiency can be improved.

  In addition, since the sandwiching tools 330, 360, 390, and 420 of the embodiment shown in FIGS. 17 to 20 are not simply pressed against the thin plate article, but sandwich the thin plate article, induction heating work is performed. The connection to the thin article at the time is surely made. In addition, since the sandwiching tools 330, 360, 390, and 420 are detachable with respect to the thin plate article, and the automation of the attachment and detachment work is easy, guidance is performed by supplying a large number of thin plate articles one after another. Automatic heating operation can be performed with high efficiency.

  INDUSTRIAL APPLICABILITY The present invention can be used in the case where an operation for induction heating a thin-plate article constituting a vehicle body of a vehicle by a high frequency current is performed.

It is a schematic perspective view which shows embodiment in the case of carrying out the induction heating of the one to-be-heated area | region demarcated by the thin-plate articles with the induction heating apparatus. It is the S2-S2 sectional view taken on the line of FIG. In the embodiment of FIG. 1, it is a top view of the thin-plate article which showed the induction | guidance | derivation action part of the inductor with the imaginary line by a dashed-two dotted line. FIG. 4 is a view similar to FIG. 3 showing an embodiment for inductively heating two heated regions defined in a thin article. It is a figure similar to FIG. 3 which shows 1st embodiment for carrying out the induction heating of the to-be-heated area | region defined by the thin-plate articles. It is a figure similar to FIG. 3 which shows 2nd embodiment for induction heating the three to-be-heated area | regions demarcated by the thin-plate articles. It is a figure similar to FIG. 3 which shows 1st embodiment for carrying out the induction heating of the four to-be-heated area | regions demarcated by the thin-plate articles. It is a figure similar to FIG. 3 which shows 2nd embodiment for carrying out induction heating of the four to-be-heated area | regions demarcated by the thin-plate articles. It is a figure similar to FIG. 3 which shows 3rd embodiment for carrying out the induction heating of the four to-be-heated area | regions demarcated by the thin-plate articles. It is a figure similar to FIG. 3 which shows 4th embodiment for carrying out the induction heating of the four to-be-heated area | regions defined by the thin-plate articles. A longitudinal section showing an embodiment in which an induced current can be generated in two heated regions defined in a thin plate article even if the interval between two induction acting portions in which high-frequency currents are passed in opposite directions is small FIG. In the case where the interval between two induction acting parts that are energized in the same direction as each other is small, it is possible to generate one induction current in the heated region defined as one heated region defined in the thin article. It is a longitudinal cross-sectional view which shows embodiment. It is a figure similar to FIG. 3 which shows embodiment which provided the zigzag electric circuit which consists of a good conductor in the induction | guidance | derivation action part of an inductor. It is a perspective view which shows embodiment which the electroconductive member is also a member for the suspension conveyance means of a thin-plate article. It is a perspective view which shows embodiment which the electroconductive member is also a member for the support means which supports an article made from a thin plate. It is a perspective view which shows embodiment which the electroconductive member is also a member for the slide conveyance means of an article made from a thin plate. It is a perspective view which shows 1st Embodiment about the clamping tool which is provided in the edge part of the electrically-conductive member and detachably clamps a thin-plate article. It is a perspective view which shows 2nd Embodiment about the clamping tool which is provided in the edge part of the electrically-conductive member and clamps thin article | items made | formed detachably. It is a perspective view which shows 3rd Embodiment about the clamping tool which is provided in the edge part of the electrically-conductive member and detachably clamps a thin-plate article. It is a perspective view which shows 4th Embodiment about the clamping tool which is provided in the edge part of the electrically-conductive member and detachably clamps a thin-plate article. It is a top view of the article made from a thin plate which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply device 2 Feeding cable 3 Cooling pipe 1040,70,100,130,200,220,240,270,290,310,340,370,400,430 Thin-plate articles 11,41, 42,71-73,101-103,131-134,241,271,291,311,312,341,341 Heated area 20,50,80,110,140,170,180,210,230,250 Child 21, 51, 52, 81-83, 111-113, 141-144, 171-174, 181-184, 211, 212, 231, 232, 251 Guiding action part 30, 61, 62, 91-93, 121 -124, 151-154, 161-164, 191-194, 261, 281, 282, 283, 301, 302 303,321,322,324,351,381,411,441 conductive members 330,360,390,420 clamping tool

Claims (11)

A thin plate article is provided with an induction portion that opposes one heated region defined in an elongated shape, and a high-frequency current is passed through the induction portion to simultaneously heat the entire area of the one heated region. One inductor to
A power supply device that feeds a high-frequency current to the induction working portion of the inductor;
An induction heating device for a thin plate article comprising:
Has a conductive member for connecting the one end and the other end of said one of said heated region,
The induction heating apparatus for a thin plate article, wherein the conductive member has a deformable property capable of following the deformation of the thin plate article. A thin plate article is provided with an induction portion that opposes one heated region defined in an elongated shape, and a high frequency current is applied to the induction portion to simultaneously heat the entire region of the one heated region. One inductor to
A power supply device that feeds a high-frequency current to the induction working portion of the inductor;
An induction heating device for a thin plate article comprising:
A conductive member for connecting one end and the other end of the one heated area;
The induction heating apparatus for a thin article, wherein the conductive member also serves as a conveying means for conveying the thin article. A thin plate article is provided with an induction portion that opposes one heated region defined in an elongated shape, and a high frequency current is applied to the induction portion to simultaneously heat the entire region of the one heated region. One inductor to
A power supply device that feeds a high-frequency current to the induction working portion of the inductor;
An induction heating device for a thin plate article comprising:
A conductive member for connecting one end and the other end of the one heated area;
The induction heating apparatus for a thin article, wherein the conductive member also serves as a supporting means for supporting the thin article. A thin plate article is provided with an induction portion that opposes one heated region defined in an elongated shape, and a high frequency current is applied to the induction portion to simultaneously heat the entire region of the one heated region. One inductor to
A power supply device that feeds a high-frequency current to the induction working portion of the inductor;
An induction heating device for a thin plate article comprising:
A conductive member for connecting one end and the other end of the one heated area;
An end of the conductive member is provided with a sandwiching tool for sandwiching the thin article at the end of the heated region, and the conductive member is attached to the thin article with the sandwiching tool. An induction heating apparatus for a thin article, which is detachable . A thin plate article is provided with an induction action section that faces a plurality of heated areas, each of which is defined by an elongated shape, and the induction action section is energized with a high-frequency current so that the entire area of the plurality of heated areas is simultaneously covered. One inductor for induction heating;
A power supply device that feeds a high-frequency current to the induction working portion of the inductor;
An induction heating device for a thin plate article comprising:
A first conductive member for connecting the plurality of heated regions in series following the current flow path by the induction acting portion of the one inductor;
Second conductivity for connecting a start end of the heated region located on the start end side in the current flow path and a terminal end of the heated region located on the end side among the plurality of heated regions. Members,
An induction heating apparatus for thin plate articles, comprising: 6. The induction heating apparatus for a thin article according to claim 5 , wherein the conductive member has a deformable property capable of following the deformation of the thin article. The induction heating apparatus for a thin article according to claim 5 or 6 , wherein the conductive member also serves as a conveying means for conveying the thin article. . The induction heating apparatus for a thin article according to any one of claims 5 to 7 , wherein the conductive member also serves as a support means for supporting the thin article. Induction heating device. The induction heating apparatus for a thin article according to any one of claims 5 to 8 , wherein the induction working part facing the heated area extends beyond an end of the heated area. An induction heating apparatus for a thin article having a length extending to the outside. The induction heating apparatus for a thin article according to any one of claims 5 to 9 , wherein an end of the conductive member is a clamping tool for sandwiching the thin article at an end of the heated region. And the conductive member is detachable with respect to the sheet-like article with this sandwiching tool. An operation step of causing the induction acting portion of one inductor to face a plurality of heated regions, each of which is defined by an elongated shape, on a thin article;
An operation step of simultaneously inductively heating the whole area of the plurality of heated regions by energizing a high-frequency current to the induction acting portion of the one inductor;
An induction heating method for a sheet-shaped article containing
The plurality of heated regions are connected in series by a first conductive member following the current flow path by the induction acting portion of the one inductor, and the current flow is out of the plurality of heated regions. An operation step of forming a circulation electric circuit by connecting a start end portion of the heated region located on the start end side in the sending path and a terminal end portion of the heated region located on the end side with a second conductive member;
A high-frequency current is passed through the inductive action portion of the inductor, and this energization causes the induced current generated in the plurality of heated regions to circulate using the circulation circuit as a flow path. Working steps for simultaneously performing induction heating on
A method for induction heating of an article made of thin sheet, comprising: