JP2017027674A - Induction heating apparatus and induction heating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating apparatus and an induction heating method, capable of performing reflow processing successfully without a defect even in a gas and a liquid.SOLUTION: An induction heating apparatus 200 according to the present invention has a configuration characterized in that an induction heating apparatus heating an object by induction heating includes a coil 210 wound in a hollow and a core 220 attachable/detachable so as to be inserted into the inside of the wound coil 210.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an induction heating apparatus and an induction heating method for heating an object by induction heating.

  Conventionally, electronic parts such as electric elements, IC chips, terminals, connectors, etc. have been made of tin or tin alloy plating (solder plating) on the surface of metal parts for soldering to the circuit and protection from oxidative corrosion. A film is formed. However, in recent years, in view of the environmental load of the eluted lead, the industry has been promoting lead-free use that does not use lead.

  However, whiskers called whiskers (also referred to as whiskers) are deposited on a film made of a tin alloy that does not use lead, which may cause a short circuit. Since the generation of the whisker is considered to be one of the causes of the residual stress of the plating layer and the substrate, a technique for removing the residual stress by heat treatment, that is, a so-called reflow process has been developed.

  As a method for heating a metal object during the reflow treatment, induction heat treatment is becoming widespread. Strictly, it is not used for the reflow process, but in Patent Document 1, for example, the work coil for induction heating is detachably attached to the work coil so that it can be exchanged corresponding to the metal member. An induction heating device including a core made of a magnetic material is disclosed. According to Patent Document 1, dielectric heating corresponding to metal members having different shapes or the like can be performed without changing the work coil.

JP 2005-235478 A

  However, in patent document 1, it is a form which covers a core on the outer side of a coil. For this reason, heat radiation from the coil hardly occurs, the heat is trapped inside the core, and the high temperature state of the core continues for a long time. Generally, when the core is used in a gas, it is coated. However, if the high temperature state continues for a long time, the coating may be deteriorated and rust and corrosion may occur.

  Moreover, it is assumed that the reflow process when forming the plating film is performed not only in the air (in the gas) but also in the liquid (in the solution). In the case of the structure as in Patent Document 1, when the reflow process is performed in a liquid, the liquid tends to remain inside the core, which causes corrosion of the coil and the core.

  In view of such a problem, an object of the present invention is to provide an induction heating apparatus and an induction heating method capable of performing a reflow process satisfactorily in the air and in a liquid without a problem.

  In order to solve the above problems, a typical configuration of an induction heating device according to the present invention is an induction heating device that heats an object by induction heating. And a core that is detachable so as to be inserted.

  According to the said structure, a core is arrange | positioned inside the coil wound hollowly. Thereby, the heat of a coil can be efficiently radiated in the air or liquid. Therefore, it is possible to suppress deterioration of the coating on the core and prevent damage. In addition, since the coil is hollow and the core is disposed inside the coil, there is no space where the liquid easily remains. Thereby, the corrosion of the core at the time of the reflow process in the liquid can be prevented. Therefore, the reflow process can be performed satisfactorily in the air and in the liquid without any problem.

  The objective surface of the core may be an inclined surface or an uneven surface according to the shape of the object to be heated. Thereby, it becomes possible to heat the target object of a complicated shape favorably.

  As for the objective surface of the said core, the position which needs a heating among the target objects is good to protrude. Thereby, it becomes possible to reflow-process efficiently only the location which needs a heating among hoop-like objects.

  In order to solve the above-described problems, a typical configuration of the induction heating method according to the present invention is an induction heating method in which an object is heated by induction heating. Using an induction heating device including a core that can be attached and detached so as to be inserted, heating is performed by exchanging the core with a shape corresponding to a shape of the target object or a position where heating is required among the target object. The component corresponding to the technical idea in the induction heating apparatus described above and the description thereof can be applied to the induction heating method.

  According to the present invention, it is possible to provide an induction heating apparatus and an induction heating method capable of performing a reflow process satisfactorily without problems in the air and liquid.

It is a figure explaining the metal component to which the induction heating method of this embodiment is applied. It is a figure explaining the manufacturing process of the metal component shown in FIG. It is a figure explaining the induction heating apparatus concerning this embodiment. It is a whole perspective view of an induction heating device.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Metal parts)
FIG. 1 is a diagram illustrating a metal component 100 to which the induction heating method of the present embodiment is applied. 1A is a plan view of the metal component 100, and FIG. 1B is a cross-sectional view of the metal component 100 taken along line AA. As illustrated in FIG. 1, the induction heating method of the present embodiment is applied to a hoop-shaped metal component 100 (hoop material). The hoop material is a strip material in which a strip-shaped thin flat plate or a processed product obtained by pressing the flat plate is wound in a reel shape.

  As shown in FIG. 1B, the metal component 100 of this embodiment includes a base body 102 and plating films 104a and 104b formed on the surface thereof by hoop plating. As the substrate 102, for example, copper can be exemplified, and other metals such as copper alloys and iron, and alloys thereof can be suitably used. Examples of the plating films 104a and 104b include copper plating and tin plating, but plating films made of other metals may be used.

  In the present embodiment, the metal part 100 in which the plating films 104a and 104b are formed on the surface of the base body 102 is illustrated, but the present invention is not limited to this. The induction heating method of the present embodiment can be applied to a metal member not formed with a plating film, that is, a metal member having only a base. Further, in the metal component 100 of the present embodiment, the two layers of the plating films 104a and 104b are formed on the base 102. However, the number is not limited, and the number of plating films can be changed as appropriate. .

  As shown in FIG. 1A, a notch 106 is formed in the hoop-shaped metal part 100 at predetermined intervals. In the present embodiment, of the hoop-shaped metal part 100, a substantially T-shaped piece 108 inside the notch 106 is used as a product.

  FIG. 2 is a diagram for explaining a manufacturing process of the metal component 100 shown in FIG. When the coatings 104a and 104b (see FIG. 1) are formed by hoop plating, as shown in FIG. 2, the base 102 is fed out by a feed reel 112 arranged on the upstream side, and is continuously performed. After that, the metal part 100 is formed, and the metal part 100 is taken up by a take-up reel 114 arranged on the downstream side.

  The substrate 102 delivered by the feed reel 112 undergoes a degreasing process for removing oil and fat components, a blasting process for polishing, etc. as a pretreatment, and then a plating film 104a (copper plating is exemplified) or a plating film in the plating apparatus 116. A plating process for forming 104b (exemplary tin plating) is sequentially performed. And the metal component 100 which is the base | substrate 102 after plating is sent out to the induction heating apparatus 200 of this embodiment.

  FIG. 3 is a diagram illustrating the induction heating device 200 according to the present embodiment. 3A is a plan view of the front side of the induction heating device 200 (side facing the metal component 100), and FIG. 3B is the back side of the induction heating device 200 (side not facing the metal component 100). 3 (c) is a cross-sectional view of FIG. 3 (a). FIG. 4 is an overall perspective view of the induction heating device 200. Hereinafter, the induction heating method of the present embodiment will be described together with the induction heating device 200 in detail.

  The induction heating apparatus 200 of the present embodiment heats the metal component 100 that is the object by induction heating. As shown in FIGS. 3A and 3C, the induction heating device 200 of this embodiment includes a coil 210 and a core 220. As shown in FIG. 3A, in the induction heating apparatus 200 of the present embodiment, the coil 210 is wound in a hollow shape, and the ends 212a and 212b of the coil 210 are connected to a power source (not shown). Yes.

  A removable core 220 is disposed inside the coil 210 so as to be inserted through the hollow portion. As shown in FIGS. 3B and 3C, the core 220 disposed in the hollow portion of the coil 210 is fixed to the coil 210 by a fixing tool 230 attached from the back side. As an example of the fixture 230, a snap fit formed of a heat resistant resin can be given.

  As shown in FIGS. 3C and 4, the metal component 100 is disposed between the induction heating devices 200 disposed in a pair. When high-frequency AC power is supplied from the power source to the coil 210, a magnetic field is formed around the coil 210. When the magnetic field is applied to the base 102 (see FIG. 1) of the metal component 100, an eddy current flows through the base 102 by electromagnetic induction, and the base 102 generates heat by induction heating. When the substrate 102 generates heat, the heat is transferred to the plating films 104a and 104b, and the plating films 104a and 104b are heated. Thereby, the metal component 100 is heated using the induction heating of the coil 210.

  At this time, in the induction heating apparatus 200 of the present embodiment, the core 220 is disposed inside the coil 210 that is wound in the hollow, so that the heat of the coil 210 is efficiently radiated into the air or liquid. . Thereby, alteration of the coating of the core 220 can be suppressed and damage can be prevented. Further, since the coil 210 is hollow and the core 220 is disposed on the inside thereof, the liquid hardly remains in the coil 210. Therefore, the corrosion of the core 220 during the reflow process in the liquid can be prevented. Therefore, according to the induction heating apparatus 200 of the present embodiment, it is possible to perform the reflow process satisfactorily without any problem even in the air and in the liquid.

  Further, as shown in FIG. 2C, in the induction heating apparatus 200 of the present embodiment, the objective surface 222 of the core 220 has a region that needs to be heated in the metal component 100 that is the object, that is, inside the notch 106. A position corresponding to the piece 108 (see FIG. 1) protrudes. Thereby, it becomes possible to reflow-process efficiently only the location which needs a heating among hoop-shaped metal components (object).

  In addition, in this embodiment, although the structure which makes the objective surface 222 of the core 220 protrude according to the shape of a target object was illustrated, it is not limited to this. For example, when the region requiring heating protrudes or is inclined in the metal component 100 that is the object, the objective surface 222 of the core 220 is formed with an inclined surface or an uneven surface according to the shape of the object. Good. As a result, even an object having a complicated shape can be satisfactorily heated (reflow treatment).

  As described above, by preparing a core having a shape corresponding to the shape of the object or a position that requires heating among the objects, the object having various shapes can be obtained by simply replacing the core according to the object. Can be heated. At this time, particularly in the present embodiment, as shown in FIG. 2C, the fixing tool 230 is removed to remove the core 220 from the coil 210, and a different core 220 is arranged in the hollow portion of the coil 210. Replacing is completed just by fastening. Accordingly, the above-described advantages can be obtained while facilitating the replacement work.

  Here, in this embodiment, as shown in FIG. 4, the induction heating apparatus 200 is supported on both sides by support plates 250. Specifically, the support plate 250 is provided with a long hole 252, and the induction heating device 200 is fixed to the support plate 250 by a screw 260 inserted through the long hole 252. The long hole 252 is long in a direction to be separated from and contacting the metal part 100. Thereby, the distance between the induction heating apparatus 200 and the metal part 100 can be adjusted within the range of the length of the long hole 252, and the degree of freedom in positioning can be increased.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used as an induction heating apparatus and an induction heating method for heating an object by induction heating.

DESCRIPTION OF SYMBOLS 100 ... Metal component, 102 ... Base | substrate, 104a ... Film | membrane, 104b ... Film | membrane, 106 ... Notch, 108 ... Piece, 112 ... Feeding reel, 114 ... Winding reel, 116 ... Apparatus, 200 ... Induction heating apparatus, 210 ... Coil, 212a ... end, 212b ... end, 220 ... core, 222 ... objective surface, 230 ... fixture, 250 ... support plate, 252 ... slot

Claims (4)

In an induction heating apparatus that heats an object by induction heating,
A coil wound in a hollow;
An induction heating apparatus comprising: a core that is detachable so as to be inserted inside the wound coil.   The induction heating apparatus according to claim 1, wherein the objective surface of the core is an inclined surface or an uneven surface according to a shape of an object to be heated.   The induction heating apparatus according to claim 1, wherein the objective surface of the core protrudes from the object in a position that requires heating. In an induction heating method of heating an object by induction heating,
Using an induction heating device comprising a coil wound in a hollow and a core removable so as to be inserted inside the coil wound,
An induction heating method characterized in that heating is performed by exchanging the core with a shape corresponding to the shape of the object or the position of the object that requires heating.

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