KR20160020299A - Induction heating head for melting and supplying material - Google Patents

Abstract

The present invention relates to an induction heating head and, more specifically, to an induction heating head for melting and supplying a metal material. Particularly, the present invention relates to an induction heating head for locally heating a supplied metal material to supply the same in a molten state. The induction heating head according to the present invention is applicable in various technological fields such as soldering, metal welding, and 3D printing using metal materials, etc. The induction heating head for melting and supplying a metal material according to the present invention comprises: an induction heating coil to be electrically connected to a high-frequency power supply; and a magnetic core. The magnetic core has a hollow cylindrical shape made of a magnetic substance to provide a path of a magnetic flux induced by the induction heating coil, and includes: an entry portion for supplying a metal material to the hollow interior; and an exit portion for discharging the supplied metal material. The induction heating head comprising the induction heating coil and the magnetic core according to the present invention can melt and supply an exact amount of a required metal material by concentrate the magnetic flux for induction heating.

Description

TECHNICAL FIELD [0001] The present invention relates to an induction heating head for melting and supplying a metal material,

The present invention relates to an induction heating head, and more particularly, to an induction heating head for melting and supplying a metal material. In particular, the present invention relates to an induction heating head for locally supplying a metal material to be supplied in a molten state. The induction heating head according to the present invention can be applied to various technical fields such as soldering, metal welding, and 3D printing of a metal material.

Today, most electronic products are soldered to electrically connect and mechanically fix electronic components to a printed circuit board (PCB). A solder paste is applied between a terminal of an electronic component and a pad of a PCB by soldering an electronic component by applying solder to the PCB while supplying a solder wire to the solder position while applying heat thereto to melt the solder paste, (hereinafter, referred to as solder paste soldering) in which a solder paste is applied and heated to melt and solder.

On the other hand, solder alloys used in the manufacture of electronic products have melting temperatures in the range of about 190 ° C to 300 ° C. When soldering, the lead alloys are heated above the melting temperature, so that the soldered electronic components and the PCB are heated to a high temperature above the normal operating temperature rating. Particularly, when soldering by a reflow soldering process or a wave soldering process, which is one of solder paste soldering methods, both the parts and the PCB are heated above the melting temperature of the lead alloys. Even in the brazing method, portions of the electronic parts and the PCB that are in contact with the soldering iron are locally heated above the melting temperature of the brazing alloy.

Thus, the electronic components are manufactured to have a higher temperature rating than necessary to operate safely even when exposed to high temperatures during the soldering process, which increases the manufacturing cost of the electronic components. In addition, electronic components heated to a high temperature in the brazing process may be damaged by thermal shock. Particularly, the reflow soldering process causes cracks in the electrolytic capacitor and the semiconductor package, and causes a decrease in the strength of the multilayer PCB and a crack around the via hole.

An induction heating soldering apparatus for solving the problems of the above conventional soldering method, in particular, the problems of the wave soldering process and the reflow soldering process, is disclosed in U.S. Patent No. 6,188,052 B1 entitled MATRIX-INDUCTION SOLDERING APPARATUS AND DEVICE . The device disclosed in the patent includes a plurality of induction cells and a switching device arranged in a matrix form. The switching device is configured to supply power to each of the induction cells to perform soldering by locally melting the lead alloy applied between the terminals of the electronic components mounted on the PCB and the PCB pads. However, the induction heating soldering apparatus disclosed in the above patent document is difficult to apply to soldering of a lead soldering type, as a surface mounting device for soldering an electronic component surface-mounted on a PCB. In particular, no specific method or apparatus for supplying the lead wire to the magnetic field formed by the induction coil has been proposed.

On the other hand, there is known an induction heating soldering apparatus capable of locally soldering terminals of electronic parts and pads of a PCB locally by an induction heating method in a noncontact manner. FRISCH, Germany, manufactures and sells induction heating soldering apparatus of the brazing type, and an embodiment of the soldering apparatus is disclosed at the homepage (http://www.frisch-gmbh.de/). 1 is an embodiment of an induction heating soldering apparatus similar to that disclosed in the above-mentioned home page. The induction heating soldering apparatus shown in Fig. 1 has an induction heating coil 10 and a high frequency power supply 20 connected to both ends of the induction heating coil 10. [ The end portion 10a of the induction heating coil 10 is wound in a loop shape with one side opened and bent in an L shape. The end of the induction heating coil 10 is brought close to the vicinity of the terminal 41a of the component 41 inserted into the component insertion hole of the PCB 40 and the end of the induction heating coil 10 And the solder 30 is melted and soldered by bringing the lead to the vicinity of the lead 10a. When a high frequency current flows through the induction heating coil 10, a magnetic field is generated by the electromagnetic induction phenomenon. When the conductor is placed in the changing magnetic field, an induction current is generated and heated. Low lead solder is melted and soldered.

However, the conventional induction heating soldering apparatus shown in Fig. 1 has the following problems. First, the magnetic field formed by the induction coil can not be concentrated in the local area to be heated, and the heated part is wide, so that the surrounding parts can be damaged. Figure 2 shows the energy distribution of the range heated by the induction heating soldering apparatus shown in Figure 1 in isoline. An electronic component having a heating region a-g widely distributed around the end portion 10a of the coil 10 and located around the end portion 10a of the coil 10 in addition to the rod 30 as shown in Fig. It is heated to cause damage. In addition, the portion far from the end of the rod to be heated by the induction coil may be melted first, and the rod end may not be melted away, resulting in poor soldering. Fig. 3 shows the temperature distribution of the lead solder heated by the induction heating soldering apparatus shown in Fig. 3, when a conventional induction heating soldering apparatus is heated to melt the amount of solder 30 required for soldering, a portion 30b spaced from the end 30a of the solder 30 by a certain distance Is heated to a temperature higher than the end. Therefore, when the end portion 30a of the lead 30 is required to be melted as much as necessary for soldering, an excessive amount of lead is first melted at the position 30c far from the end portion, or an end portion 30a of the lead rod is melted The highest temperature portion 30b of the end portion is melted first and the end portion 30a is removed in a non-melted state, resulting in a weld defect. Further, when the solder supplied for brazing is disposed in the vicinity of the induction coil, it is heated by the induction coil and thermally deformed, making it difficult to accurately locate the solder. In addition, in order to avoid heating of an unnecessary portion of lead soldering by the induction coil, when the lead solder is fed with a great inclination to the coil, there is a problem that flexibility of the induction heating soldering apparatus is deteriorated due to interferences between the lead-

US 6,188,052 B1, Title of the Invention, MATRIX-INDUCTION SOLDERING APPARATUS AND DEVICE

2. Description of the Related Art [0002] With the progress of miniaturization of electronic components in recent years, the leads of electronic components become tapered, and at the same time, the interval between leads becomes narrower. In order to stably solder electronic components that are miniaturized without damage due to heating, it is required to develop a new soldering apparatus capable of locally heating only the terminals of the soldered electronic components, the pads of the PCB, and the solder alloy in a noncontact manner .

Particularly, when a very small electronic component is to be soldered by a soldering method, a direct soldering type soldering apparatus using a conventional soldering iron causes defective products due to soldering failure or damage to parts exposed to high temperature, It is difficult. Recently, a device for soldering in a non-contact manner using a laser has been proposed. The laser soldering apparatus is a device for soldering by irradiating a laser beam to a lead, lead of an electronic component and a pad of a PCB. However, there is a drawback that when a soldering apparatus using a laser is irradiated with an electronic component or a PCB by deviating from the laser light soldering region due to external disturbance during soldering, the electronic component or the PCB is damaged. In addition, the conventional induction heating soldering apparatus as shown in Fig. 1 has the drawbacks that it is difficult to locally heat only the soldering position of the PCB and the end of the lead, as described above, .

On the other hand, there is a demand for a device for melting a metal material and feeding it to a desired position. For example, in the case of repairing a mold in which a specific portion is worn by long-time use, if an apparatus capable of supplying a molten metal material to a worn portion is developed, an expensive mold can be restored to an original shape at low cost . In addition, when cracks occur in a large steel structure such as a bridge, or when reinforcement is required to cope with a change in load, when a device capable of welding a metal material by melting in the field is developed, The structure can be repaired or reinforced. In addition, there is a demand for a metal 3D printer which can easily and inexpensively manufacture parts and products using a metal material instead of a 3D printer using plastic materials. Particularly in recent years, there is a growing need for an apparatus capable of manufacturing metal parts of complicated shapes that are difficult to mass-produce inexpensively and easily.

It is an object of the present invention to provide an induction heating head having a novel structure capable of solving the above-mentioned problems of an induction heating soldering apparatus as well as a device for supplying a metallic material by supplying it with oil. Particularly, it is an object of the present invention to provide an induction heating head configured to concentrate a magnetic field formed by an induction coil to a local region of a material to be heated. It is also an object of the present invention to provide an induction heating head configured to heat only the end portion of a wire to be fed, when the metal material is supplied in a wire form. Another object of the present invention is to provide an induction heating head capable of accurately and easily supplying a molten metal material to a predetermined position by a desired amount.

An induction heating head for melting and supplying a metallic material according to the present invention includes an induction heating coil for being electrically connected to a high frequency power source and a magnetic core. Wherein the magnetic core is in the form of a hollow cylinder made of a magnetic material for providing a path of a magnetic flux induced by the induction heating coil and has an inlet for supplying a metal material to the inside of the hollow, And an outlet portion.

The induction heating coil can be formed by spirally winding the conductive wire (in the form of a solenoid) or by winding the conductive plate in a circular shape. An induction heating coil formed by winding a conductive material in a spiral or circular shape forms a hollow magnetic flux passage in the center portion. When a high frequency power source is applied to the induction heating coil, the center of the induction heating coil and the outside of the induction heating coil are connected by a closed curve, and a magnetic force line whose direction changes according to the frequency of the high frequency power source is formed. Also, the conductor located inside the magnetic field formed by the magnetic force lines whose direction is changed by the electromagnetic induction phenomenon is heated.

The magnetic core is formed of a magnetic material and provides a path of a magnetic field induced by the induction heating coil to prevent magnetic flux from passing through the metal material inserted in the hollow of the core to prevent heating of the metal material located in the hollow of the core . The magnetic core may use a ferromagnetic material, but it is preferable that the magnetic material core is not heated to a high temperature, for example, a soft magnetic material core such as a cored core formed of an oxide such as a ferrite core or a metal powder. The outlet of the magnetic core is configured to allow magnetic flux to pass through the metal material discharged through the outlet portion to heat and melt the metal discharged from the hollow of the magnetic core. Therefore, when the metal material is continuously supplied, the metal material located inside the magnetic core is not heated by the induction current but is heated by conduction from the metal material heated at the outlet of the magnetic core.

The metal material used in the practice of the present invention may be, for example, iron or iron alloy, copper or copper alloy, lead or lead alloy, aluminum or aluminum alloy, or the like. The shape of the metal material to be supplied may be various forms depending on the application. For example, in the form of a wire, or in powder form. Further, even when supplied in the form of a wire, various forms such as a filament type or a plurality of wires can be used. Even in the case of powder, the shape of the particles may be spherical, cylindrical, flaky, or the like.

In some embodiments, the magnetic core may be placed inside the induction heating coil or adjacent to the outside of the induction heating coil. When the magnetic core is disposed inside the induction heating coil, an induction heating coil formed by winding a wire rod is used, or an induction heating coil formed by winding a plate material into a zigzag shape so as to form a hollow is used . The induction heating coil having the hollow is formed by concentrating the magnetic flux at the position to be soldered to increase the magnetic flux density and the magnetic core inserted into the hollow of the induction heating coil limits the heating range of the metal material and melts and supplies the required amount, At the same time, the magnetic flux can be concentrated and passed through the position where the molten metal material is supplied, so that the portion to which the molten metal is attached can be locally heated.

In some embodiments, a magnetic core inserted in the hollow of the induction heating coil is used that is longer than the length of the induction heating coil to heat and melt the metal material discharged from the hollow of the magnetic core, It is preferable to dispose it slightly exposed from the end of the induction heating coil.

The magnetic force lines exiting from the core through the cutout of the exit portion of the magnetic core or coming into the magnetic core from the outside through the cut surface of the exit portion of the magnetic core are arranged in such a manner that the center line of the core So that it becomes a convexly curved curve shape. Therefore, the metal material discharged through the outlet portion hollow of the magnetic core and the magnetic force lines passing through the magnetic core are bridged to induce heating of the metal material. In some embodiments, the outlet of the magnetic core may be configured such that the inner diameter of the inner circumferential surface of the hollow core is increased along the longitudinal direction to increase the tapered surface on the inner circumferential surface of the outlet portion. When a line of magnetic force passes through a magnetic core through a tapered surface of a magnetic core outlet portion, a magnetic force line is generated through a hollow portion of a metal material, which is discharged through a hollow portion of the outlet portion, It becomes a linkage. In some embodiments, the outlet of the magnetic core may be configured to extend radially inward. When the outlet portion is inwardly opposed to the outer circumferential surface of the metal material discharged to the outlet portion of the magnetic core, most of the magnetic force lines coming out from the outlet portion through the outlet portion or from the outside to the magnetic core are bridged with the metal material discharged through the outlet portion The metal material can be heated more effectively.

In some embodiments, the inlet of the magnetic core is radially outwardly extended so that the magnetic force lines induced by the induction heating coil and the metal material fed into the hollow of the core through the inlet of the core are not bridged, It is possible to prevent the metal material supplied to the inlet portion from being heated at the inlet portion. In some embodiments, the diameter of the outer circumferential surface of the inlet portion of the magnetic core may be reduced along the longitudinal direction toward the end, so that a tapered surface may be formed on the outer circumferential surface of the inlet portion. When the magnetic force lines pass through the magnetic core through the tapered surface of the inlet portion, the magnetic force lines induced by the induction heating coil are not bridged with the metal material inserted into the hollow of the magnetic core through the inlet portion, .

In some embodiments, the magnetic core may be disposed in an induction heating coil of a solenoid shape formed by winding a wire rod or an induction heating coil of a shape formed by winding a plate material. If the magnetic core is disposed in a hollow magnetic flux passage formed at the center of the induction heating coil, the induction heating head can be made compact. Further, the induction heating head according to the present invention may further include a magnetic flux guide core for use as a passage of magnetic force lines induced by the induction heating coil and formed on the outside of the coil. The magnetic flux guide core is in the form of a hollow cylinder made of a magnetic material and can be installed such that at least a part of the induction heating coil is inserted into the hollow of the magnetic flux guide core. The magnetic flux guide core blocks the surrounding components from being affected by the magnetic force lines induced by the induction heating coil outside the induction heating coil.

In some embodiments, the induction heating head can be configured by inserting the inner magnetic flux guide core made of a magnetic material into the magnetic flux passage inside the induction heating coil and installing the magnetic core outside the induction heating coil. It is preferable that the outlet portion of the magnetic core is disposed adjacent to the end portion of the inner magnetic flux guide core so that the metal material discharged to the outlet portion is linked with more magnetic force lines passing through the magnetic core and the inner magnetic flux guide core. The inner flux guide core can be configured as a hollow or solid cylinder shape. It is preferable that both the magnetic core and the inner magnetic flux guide core are formed of a soft magnetic material.

The induction heating head according to the present invention can be used in various devices. For example, when used in a soldering apparatus, a lead or lead alloy formed in the form of a wire can be used as a metal material to be melted. When installed in a 3D printer, it can be used as a metal material to be melted such as iron or iron alloy, copper or copper alloy, aluminum or aluminum alloy. The metal material is preferably supplied in the form of a wire.

According to the present invention, a new type of induction heating head applicable to various technical fields is provided. The induction heating head according to the present invention is provided with an induction heating coil and a magnetic core to focus the magnetic flux for induction heating and to melt and supply the metal material as precisely as necessary. Particularly, it is possible to locally heat the portion to which the molten metal is supplied and to be laminated in a non-contact manner, so that the supplied molten metal can be more firmly adhered. In addition, it is possible to locally heat the portion where the molten metal is stacked, thereby minimizing the thermal influence on the workpiece that occurs when the periphery of the workpiece is heated to a large extent.

1 is a schematic diagram of a conventional induction heating soldering apparatus
2 is an explanatory view schematically showing the induction heating range in the induction heating soldering apparatus shown in Fig.
Fig. 3 is an explanatory view showing the temperature distribution of the lead end when induction heating is conducted by induction heating using the induction heating soldering apparatus shown in Fig. 1. Fig.
4 is a schematic view of an induction heating soldering apparatus applying an embodiment of the induction heating head according to the present invention
5 is a cross-sectional view showing a state in which a magnetic core is inserted into an induction heating coil in an embodiment in which an induction heating head according to the present invention is applied to an induction heating soldering apparatus
Fig. 6 is a schematic view illustrating the local heating of the electronic component terminal and the soldering in the induction heating soldering apparatus of Fig. 5
Figures 7 (a) - (e) are schematic views illustrating various embodiments of the inlet and outlet portions of the magnetic core
8 is an explanatory view showing another method of using the induction heating soldering apparatus shown in FIG.
9 is a schematic view of an induction heating soldering apparatus applying another embodiment of the induction heating head according to the present invention
10 is a schematic view of another embodiment of an induction heating head according to the present invention
11 is a schematic view of another embodiment of an induction heating head according to the present invention
12 is a schematic cross-sectional view of another embodiment of the induction heating head according to the present invention
13 is a schematic view of another embodiment of an induction heating head according to the present invention
14 is an explanatory view showing another method of using the induction heating head shown in Fig.
15 is an explanatory view showing another method of using the induction heating head in the present invention
16 is a schematic view of a 3D printer to which an embodiment of the induction heating head according to the present invention is applied
Fig. 17 is a detailed view of the induction heating head applied to the 3D printer of Fig. 16
Fig. 18 is a detailed view of another embodiment of the induction heating head applied to the 3D printer of Fig. 16

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment shown in FIG. 4 is an apparatus for induction heating and soldering an end portion of the barrel 130. The induction heating soldering apparatus includes a high frequency power supply unit 120 and an induction heating head 100. The induction heating head 100 includes an induction heating coil 110 electrically connected to a high frequency power source and a magnetic core 150. The induction heating coil 110 is in the form of a solenoid formed by spirally winding a conductive wire such as copper, and a hollow magnetic flux passage is formed in the center. The magnetic core 150 is in the form of a hollow cylinder made of a magnetic material for providing a path of magnetic flux induced by the induction heating coil 110 and inserted in the center of the induction heating coil 110. In addition, a rod 130 is inserted as a metal material for melting and supplying in the hollow of the magnetic core 150. Although not shown, it may further include a lead supply means for supplying the lead core to the hollow of the magnetic core 150.

5, when a high-frequency power source is applied to the induction heating coil 110 of the induction heating head 100, a magnetic force line 180 connecting the solenoid central portion of the induction heating coil 110 and the outside with a closed curve is formed, The magnetic force lines 180 change in direction depending on the frequency of the high frequency power source. The magnetic force line 180 passing through the center of the induction heating coil 110 passes through the magnetic core 150 inserted in the center portion and the magnetic core 150 is made of a magnetic material and is wound around the magnetic force lines 180 are concentrated and the magnetic flux density is increased. The magnetic core 150 has an inlet portion 150a for supplying the rod 130 to one end of the hollow and an outlet portion 150b for discharging the rod. Generally, a conductor located inside a magnetic field formed by a magnetic force line whose direction changes due to electromagnetic induction phenomenon is heated. However, the metal material such as the rod 130 inserted in the hollow of the magnetic core 150 has a magnetic shielding region 160 formed in the hollow of the magnetic core 150 by the magnetic core 150, It is not heated because it is not. 5, the rod 130 passing through the magnetic core 150 and discharged to the outlet 150b is linked to the magnetic flux at the outlet 150b of the magnetic core 150. As shown in FIG. Therefore, only the end of the rod 130 discharged from the hollow of the magnetic core 150 is heated by the electromagnetic induction phenomenon. That is, the magnetic core 150 allows only the end portion 130a of the billet 130 discharged to the outlet portion 150b of the magnetic core 150 to be heated and melted.

Referring to FIG. 6, the principle of heating the end portion 130a of the rod 130 will be described in detail. 6, when a magnetic force line 180 passing through the inside of the magnetic core 150 exits through the exit portion 150b of the core or enters the core 150, the magnetic field is uniformly distributed in the space The magnetic force line 180 is curved convexly toward the center line of the core. Therefore, the end portion 130a of the rod 130 exposed through the outlet portion 150b of the magnetic core 150 and the magnetic force line 180 passing through the magnetic core are linked to each other, so that only the end portion 130a of the rod is heated do. At this time, a part of the magnetic force lines 181 - 183 passing through the end portion 130a of the lead barriers 130 is pressed against the terminals 141a of the workpieces 141 to be soldered and the printed circuit board 140 And is heated while passing through the mounted metal pad 154.

Referring to FIG. 5, the length of the magnetic core 150 inserted in the hollow of the induction heating coil 110 is longer than the length of the induction heating coil 110. The outlet 150b of the magnetic core 150 is disposed adjacent to the lower end of the solenoid-shaped induction heating coil 110 and is disposed slightly exposed from the end of the induction heating coil 110. [ That is, the inlet 150a of the magnetic core 150 is arranged to deviate more from the induction heating coil 110 than the outlet 150a. The density of magnetic force lines is lowered in the vicinity of the entrance portion 150a so that the magnetic force lines connecting with the rod 130 inserted into the entrance portion 150a of the core 150 become lean and inserted into the entrance portion 150a So that the actual lead 130 is hardly heated. Therefore, only the end portion of the rod 130 discharged from the hollow of the magnetic core 150 of the oil price heating head 100 to the outlet portion 150b is heated and melted and inserted into the inlet portion 150a of the magnetic core 150 The soldering iron 130 is hardly heated.

According to the present invention, the magnetic core 150 of the magnetic heating head 100 concentrates the magnetic flux induced by the induction heating coil 110 to a position where it is desired to be soldered so as to increase the magnetic flux density, A shielding region 160 is formed so that magnetic force lines do not pass through the metal material passing through the hollow of the magnetic core 150 and magnetic force lines are allowed to pass through the metal material discharged to the outlet portion 150b of the magnetic core 150. [ That is, the magnetic core 150 limits the heating range of the metal material to the portion exposed to the outlet portion 150b of the magnetic core 150, exposes only the amount required for melting to the outlet portion 150b, . The magnetic core 150 supports parts other than the exposed ends of the metal material supplied in the form of a wire so as to guide the metal material supplied in the form of a wire such as the rod 130 to the machining position of the workpiece precisely . In addition, the induction heating head according to the present invention can locally heat the workpiece for attaching the molten metal material as well as the molten metal material, thereby minimizing the influence of the heat of the workpiece. Particularly, when the head according to the present invention is used in a soldering apparatus, at the same time as the end of the lead 130 discharged to the outlet 150b of the magnetic core 150, the solder is soldered locally, .

Although not shown, in order to prevent the induction heating coil 110 of the induction heating coil 100 from being overheated, the induction heating coil may be formed of a metal pipe such as copper, and the cooling water may flow into the pipe. During the use of the induction heating head, current is supplied to the induction heating coil only during the operation of the induction heating head, and the current flowing to the induction heating coil during the movement of the head or the workpiece is blocked for the next operation, The induction heating coil of the induction heating coil can be prevented from being overheated, and energy can be saved.

Figures 7 (a) - (d) illustrate various embodiments of the magnetic core in which the shape of the inlet and the outlet are modified. The embodiment shown in Fig. 7 (a) is similar to the embodiment shown in Fig. 5 except that the shape of the outlet portion 150b is orthogonal to the center line of the cylindrical core 150, like the outlet of the magnetic core 150 of the embodiment shown in Fig. But the entrance portion 150a of the magnetic core 150 extends radially outward so as to provide a path of the magnetic flux. The magnetic core 150 shown in FIG. 7 (b) has a tapered surface formed on the outer circumferential surface of the entrance portion 150a-1 so that the diameter of the outer circumferential surface decreases toward the distal end along the central axis. The magnetic force lines tend to form a closed curve of the shortest path uniformly in the space when the magnetic force lines come out from the tapered outer circumferential surface of the core 150 or when the magnetic force lines enter the tapered outer circumferential surface, The magnetic force lines are hardly generated. The magnetic core 150 shown in Fig. 7C has a hollow inner peripheral surface of the outlet portion 150b of the core 150, as shown in Fig. 7 (b) A tapered surface is formed. 7 (c), the magnetic force lines tend to form a closed curve of the shortest path uniformly in the space. As shown in Fig. 7 (c), when the magnetic force lines come out from the tapered surfaces of the magnetic core 150 shown in Fig. More magnetic lines of force are linked to the actual payout 130. The magnetic core 150 shown in Fig. 7 (d) has a portion protruding and extending from the inner peripheral surface of the hollow portion of the outlet portion 150b toward the central axis. 7 (c), more magnetic lines of force are linked to the barrels 130. In the magnetic core shown in Fig. 7 (e), the diameter of the outer peripheral surface of the outlet portion 150b-3 decreases toward the distal end, and a tapered surface is formed on the outer peripheral surface. The distribution of magnetic force lines at the outlet portion 150b of the magnetic core 150 shown in Figure 7 (a) is larger than the distribution of the magnetic force lines at the outlet portion 150b-3 of the magnetic core 150 shown in Figure 7 (e) Since the distribution is concentrated, more magnetic lines of force can be linked with the rod 130 to enhance the heating effect. The shapes of the inlet portion and the outlet portion of the magnetic core 150 shown in Fig. 7 can be selectively applied as required. The magnetic core 150 may use a ferromagnetic material, but it is preferable that the magnetic core 150 is not heated to a high temperature by using, for example, a soft magnetic material core such as a cored core formed of an oxide such as a ferrite core or a metal powder. Particularly, the compacting core is a compacted magnetic material adhered with an insulating bonding material, and is suitable for high frequencies. In addition, since the magnetic powder of the pinion core has a shape close to a sphere, the magnetic permeability is small with respect to a wide magnetic field because the magnetic force is large, but the value of the specific magnetic permeability does not change with respect to the magnetic field.

8 is an explanatory view showing another method of using the induction heating soldering apparatus shown in Fig. The induction heating head 100 may be disposed at an inclination with respect to the PCB 140 on which the electronic component 141 is mounted. In addition, when the induction heating head 100 is used in an inclined arrangement, not only electronic components mounted on the holes of the PCB 140 but also components such as electric wires and connectors can be soldered, It is possible to solder the lead wire of the electronic component mounted by the electronic component. Further, although the apparatus for supplying the lead cylinder 130 to the magnetic core 150 is not shown in this embodiment, it may be further included. The supply means for supplying a metallic material such as lead to the inlet of the magnetic core may be, for example, continuously supplying a solder wire wound in a roll form to the magnetic core, or supplying a solder ball to the magnetic core They can be supplied one by one to the hollow. Further, it may further include a feed mechanism for moving the induction heating head 100 to a proper position with respect to the workpiece, a cooling device for cooling the induction heating coil 110, and the like.

9 is a schematic diagram of another embodiment of an induction heating head 100 'in accordance with the present invention. 9 is different from that of the induction heating head 100 shown in FIG. 4 in that the induction heating head 100 'shown in FIG. 9 has a structure in which the magnetic induction heating coil 100, which is induced by the induction heating coil 110, And a magnetic flux guide core 190 for providing a path. The magnetic flux guide core 190 is in the form of a hollow cylinder made of a magnetic material, and the induction heating coil 110 is inserted into the hollow. Further, the entrance portion 150a of the magnetic core 150 extends in the radial direction. The magnetic flux guide core 190 blocks the components in the vicinity of the soldering apparatus from being affected by the magnetic force lines induced to the outside of the induction heating coil 110.

10 is a schematic diagram of another embodiment of an induction heating head 200 according to the present invention. The induction heating head 200 of the present embodiment is different from the induction heating head 100 shown in FIG. 4 in that the induction heating coil 210 is wound around a conductive plate material such as a copper plate to form an induction heating coil And the magnetic core 250 is disposed inside. As shown in the figure, the induction heating coil 250 is formed by winding a plate material in a zigzag shape in a circular shape (alternately clockwise and counterclockwise in a cross section) to form a magnetic core 250 at the center, A hollow for insertion is formed. The induction heating coil 210 has an inner connection part 214 and an outer connection part 212 for connecting a power source. The lower portion of the induction heating coil 250 corresponding to the inlet side of the magnetic core 250 is formed in a conical shape so as to be heated in a direction approaching a portion (for example, a lead of the electronic component) . ≪ / RTI >

11 is a schematic diagram of another embodiment of an induction heating head 200 'in accordance with the present invention. 11 differs from the induction heating head 200 of the embodiment shown in FIG. 10 in that the induction heating coil 210-1 is formed by winding the conductive plate in a conical shape to form a hollow, .

12 is a schematic diagram of an induction heating soldering apparatus using induction heating head 300 according to another embodiment of the present invention. 12, the induction heating head 300 is electrically connected to the high frequency power supply unit 320 and is supplied with power. The induction heating head 300 includes an induction heating coil 310, a magnetic core 350 and an inner magnetic flux guide core 352 inserted into the hollow of the induction heating coil. The induction heating coil 310 is a solenoid formed by spirally winding a conductive wire such as copper, and a hollow magnetic flux passage is formed in the center. The magnetic core 350 is in the form of a hollow cylinder made of a magnetic material for providing a path of magnetic flux induced by the induction heating coil 110 and is disposed adjacent to the induction heating coil 310. And a solder ball 330 for soldering is supplied to the hollow core of the magnetic core 350. In addition, the entrance 350a of the magnetic core 350 has an extension extending toward the adjacent inner magnetic flux guide core 352 to provide a path of magnetic flux. In the embodiment, the inner magnetic flux guide core 352 is formed in a cylinder shape, but it may be formed in a hollow cylindrical shape. In the case of the hollow cylinder shape, the metal material discharged from the hollow may be heated by supplying the rod to the hollow of the inner magnetic flux guide core 352 to be melted. It is also preferable that both the magnetic core 350 and the inner magnetic flux guide core 352 are formed of a soft magnetic material so as not to be heated to a high temperature. When the high frequency power is applied to the induction heating coil 310, the solder ball 330 exposed through the outlet portion 350b of the magnetic core 350 disposed adjacent to the end of the internal magnetic flux guide core 352, And the magnetic flux lines passing through the magnetic core 250 and the inner magnetic flux guide core 352 are heated and melted.

13 shows yet another embodiment of the induction heating head 400 according to the present invention. 13 differs from the embodiment of FIG. 12 in that the induction heating coil 410 is formed by winding a conductive plate. The advantage of the embodiment shown in FIG. 13 is that the induction heating head 400 can be made compact and, when applied to a soldering apparatus, a narrow area can be locally heated and soldered. FIG. 14 is a view illustrating another method of using the induction heating head shown in FIG. 13; when the magnetic core 450 applied to the soldering apparatus is inclined, effective soldering can be performed while avoiding interference with surrounding electronic components .

Fig. 15 shows a state in which a metal material in the form of a ball lead 135 is melted and supplied using the induction heating head 100 according to the present invention. There is a difference in that the balloon 135 is inserted into the hollow of the magnetic core 150 and supplied instead of the barrel 130 in the apparatus to which the induction heating head 100 shown in FIG. 4 is applied. The ballpoint 135 may be preheated and supplied in advance. As shown in the drawing, the ball bearing 135 passing through the outlet portion 150b of the magnetic core 150 is linked to the magnetic force lines of the lead shield core 150, heated, melted and dropped to the soldering position.

16 shows an embodiment of a 3D printer 1000 to which an induction heating head 500 according to the present invention is applied. The 3D printer 1000 according to the present invention includes an induction heating head 500, a power supply unit 520 for supplying a high frequency power to the induction heating head 500, A material supply unit 600 for supplying the material 530 and an integrated control unit 660 for supplying power in accordance with the material supply speed of the material supply unit 600. [

The induction heating head 500 includes an induction heating coil 510 and a hollow magnetic core 550 inserted into the hollow of the induction heating coil 510. The induction heating head 500 may use the head of the embodiment shown in FIG. 4 or FIG.

The material supply unit 600 includes a reel 640 installed in the frame 610 and wound with a metal wire 530 and a motor 650 connected to an axis of the reel to rotate the reel. The frame further includes a guide member 615 for guiding the metal wire 530 unrolled from the reel 640 and an idle roller 613 for supplying the metal wire 530 passed through the guide member 615 at a constant speed. 620 and a feeding roller 630 are provided. The wire is fed between the idler roller 620 and the feeding roller 630. Teeth are formed on the outer circumferential surface of the feeding roller 630 so as not to slip the metal wire. Further, although not shown, a motor for rotating the feeding roller is provided. The integrated control unit 660 controls the rotation of the fitting roller 630 to control the feeding speed of the metal wire for 3D printing. In some embodiments, it is possible to omit the reel drive motor 650 if it is possible to supply the metal wire only with the feeding roller 630. [

In some embodiments, when a wire-shaped metal material is melted to produce a 3D part or product of an arbitrary shape, if a wire material of a rectangular shape is used rather than a circular shape of the wire cross-section, It is possible to reduce the surface roughness of the manufactured product and improve the quality of the 3D printing product.

17 is a perspective view of the induction heating coil 510. The induction heating coil 510 is formed by spirally winding a pipe. The cooling water supplied to the inlet 511 of the induction heating coil 510 is discharged to the outlet 512 to prevent the induction heating coil 510 from being overheated. Although not shown, the 3D printer may have a cooling water supply unit for cooling the induction heating coil 510 separately. 18 is a perspective view of another embodiment of the induction heating coil 510 formed by spirally winding a pipe having a rectangular cross section. When the pipe having a rectangular cross section is used, the efficiency of induction heating can be increased by increasing the flux generating area as compared with the case of using a tube having a circular section.

It should be understood that the embodiments according to the present invention described above are not intended to limit the present invention but are exemplary and the induction heating head according to the present invention can be modified into various forms. An induction heating head modified in various forms within the scope and equivalents of the claims may be considered as a specific embodiment of the present invention.

110 induction heating coil
120 High Frequency Power Supply Unit
130 PAYMENT
135 Tickets
140 PCB
150 magnetic cores

Claims (16)

An induction heating coil for being electrically connected to the high frequency power source,
A hollow cylindrical shape made of a magnetic material for providing a path of magnetic flux induced by the induction heating coil and having an inlet portion for supplying the metal material to the hollow interior and an outlet portion for discharging the supplied metal material Comprising a core,
Wherein an outlet portion of the magnetic core is configured to allow a magnetic flux to pass through a metal material discharged through an outlet portion so as to heat and melt the metal material discharged from the magnetic core. The method according to claim 1,
Wherein the magnetic core is longer than the induction heating coil and inserted in the induction heating coil,
Wherein an outlet of the magnetic core is arranged to be exposed in an induction heating coil adjacent to one end of the induction heating coil. 3. The method of claim 2,
Wherein the induction heating coil is formed by spirally winding a conductive wire. 3. The method of claim 2,
Wherein the induction heating coil is formed by winding a conductive plate in a circular shape. 3. The method of claim 2,
Wherein the outlet of the magnetic core is tapered such that the inner diameter increases toward the end along the longitudinal direction. 3. The method of claim 2,
Wherein the outlet of the magnetic core is tapered such that its outer diameter gradually decreases toward the end along the longitudinal direction, thereby melting and supplying the metal material. 3. The method of claim 2,
Wherein the outlet of the magnetic core extends radially inwardly. 3. The method of claim 2,
The inlet of the magnetic core extends radially outwardly,
And a coil external magnetic flux guide core in the form of a hollow cylinder made of a magnetic material for providing a path of the magnetic flux induced by the induction heating coil and having at least a part of the induction heating coil inserted in the hollow, An induction heating head for melting and feeding a metal material. 9. The method according to any one of claims 2 to 8,
Wherein the magnetic core is made of a soft magnetic material. 10. The method of claim 9,
Wherein the soft magnetic material magnetic core is a dust core. The method according to claim 1,
Further comprising a coil internal magnetic flux guide core inserted into the induction heating coil in a cylinder shape made of a magnetic material for providing a path of a magnetic flux induced by the induction heating coil,
Wherein an outlet of the magnetic core is disposed adjacent to an end of the coil internal magnetic flux guide core. 12. The method of claim 11,
Wherein the induction heating coil is formed by spirally winding a conductive wire. 12. The method of claim 11,
Wherein the induction heating coil is formed by winding a conductive plate in a circular shape. 12. The method of claim 11,
Wherein the outlet of the magnetic core melts and supplies a metal material characterized by a tapered diameter such that the inner diameter increases toward the end along the length. 12. The method of claim 11,
Wherein an inlet portion of the magnetic core has an inlet magnetic flux guide portion extending radially outwardly. 16. The method according to any one of claims 11 to 15,
Wherein the shielding soldering core is made of a soft magnetic material.

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