JP6334280B2 - Coil and manufacturing method thereof - Google Patents

Description

  In the present invention, a coil having a high degree of shape freedom (hereinafter, also simply referred to as a coil having a free shape) and its shape, which can be freely selected according to the application, although the shape is basically a spiral shape It relates to a manufacturing method.

  As a manufacturing method of a conventional coil, particularly a spiral electromagnetic forming coil, a cross-sectional shape mainly made of a copper alloy wound with a glass cloth tape or the like has a circular shape, a rectangular shape, or a rectangular shape having a hollow portion. The conductive wire to be presented is formed into a spiral shape by being wound around an axis by bending. Thereafter, a method of impregnating with an insulating resin has been performed (see Patent Documents 1 and 2).

  Moreover, the cross section of the conducting wire wound around the shaft has a cylindrical shape or a quadrangular shape having a hollow portion, and if necessary, a shape in which a hole for flowing a coolant is formed inside each conducting wire is used. (See Patent Documents 3 and 4).

  In the method for manufacturing a helically shaped electromagnetic forming coil as described in Patent Documents 1 to 4 described above, in order to form the electromagnetic forming coil, the cross-sectional shape of the conducting wire wound around the axis is circular, It is substantially limited to a cylindrical shape, a quadrangular shape, or a quadrangular shape having a hollow portion. Furthermore, when forming a member (element tube) having a polygonal cross section with an electromagnetic forming coil using a conducting wire having such a cross-sectional shape, the tube cross-section is formed after the forming. In other words, a method has been adopted in which a concave portion is provided in a corresponding mold so that a surplus line length is generated and deformation is facilitated (see Patent Document 5).

JP 2004-40045 A Japanese Patent No. 5213838 JP-A-6-238356 JP 2006-68774 A JP 2013-107091 A

  In the manufacturing method of the spiral electromagnetic forming coil as described in Patent Documents 1 to 5 described above, in order to be able to perform without processing failure when conducting the winding process of the conductive wire, There were significant restrictions on the material.

  That is, if the radius of the conductor cross section is 0.1 to 0.2 or less with respect to the inner diameter of the coil when the helical electromagnetic forming coil is formed, the conductor cross section is significantly deformed, resulting in processing defects. There was a problem.

  In addition, the material of the conductive wire is limited to a uniform elongation of 15% or more and a 0.2% proof stress of 400 MPa or less in order to avoid breakage during winding and suppress spring back after processing. It was. Therefore, there has been a problem that oxygen-free copper having a 0.2% proof stress of about 200 MPa has to be used for the conductive wire.

  Due to the above restrictions, there is a problem in that an electromagnetic forming coil having sufficient durability cannot be manufactured when the raw pipe as a workpiece has a small diameter or high strength lifting. . This has been a factor that hinders the spread of electromagnetic forming technology. For example, there is a problem that it is difficult to manufacture a helical electromagnetic forming coil suitable for pipe expansion or contraction forming of a raw tube having a polygonal cross section.

  Until now, as represented by the above-described electromagnetic forming coil, it has been difficult to provide a coil having a free shape and a manufacturing method thereof.

  An object of the present invention is to provide a coil having a free shape and a manufacturing method thereof.

In order to achieve this object, the coil according to the first invention is:
A coil having a coil body portion formed by removing unnecessary portions from a metal block.

The coil according to the second invention is the coil according to the first invention,
The unnecessary portion is removed by at least one of cutting, laser machining, and electric discharge machining.

The coil according to the third invention is the coil according to the first or second invention,
The coil body portion is configured to advance in a direction parallel to the axial direction while circling around an axis.

The coil according to the fourth invention is the coil according to the third invention,
The coil body portion configured to go around in the direction parallel to the axial direction while circling around the axis has a spiral shape and is used for electromagnetic forming.

The coil according to the fifth invention is the coil according to the third invention,
The coil body portion configured to go around in the direction parallel to the axial direction while circling around the axis has a polygonal shape when viewed from above, and is used for electromagnetic forming.
The coil according to the sixth invention is the coil according to the fifth invention,
The polygonal shape is composed of a plurality of straight line portions and three or more corner portions, and the radius of curvature R inside the corner portions is 10 mm or less.

The coil according to the seventh invention is the coil according to any one of the fourth to sixth inventions,
The metal mass is a nonmagnetic metal alloy having a 0.2% proof stress at room temperature of 500 MPa or more and a conductivity of 15 IACS% or more.
Here, IACS is International Annealed Copper Standard (International Annealed Copper Wire Standard).

A coil manufacturing method according to the eighth invention is:
It is a manufacturing method of a coil which has the process of forming a coil main-body part by removing an unnecessary part from a metal lump.

A coil manufacturing method according to the ninth aspect of the present invention is the coil manufacturing method according to the eighth aspect of the present invention.
The unnecessary portion is removed by at least one of cutting, laser machining, and electric discharge machining.

A coil manufacturing method according to a tenth aspect of the present invention is the coil manufacturing method according to the eighth or ninth aspect of the invention,
The coil body portion is configured to advance in a direction parallel to the axial direction while circling around an axis.
A coil manufacturing method according to an eleventh aspect of the present invention is the coil manufacturing method according to the tenth aspect,
The coil body portion configured to go around in the direction parallel to the axial direction while circling around the axis has a spiral shape and is used for electromagnetic forming.
A coil manufacturing method according to a twelfth aspect of the present invention is the coil manufacturing method according to the tenth aspect,
The coil body portion configured to go around in the direction parallel to the axial direction while circling around the axis has a polygonal shape when viewed from above, and is used for electromagnetic forming.

  As described above, the coil according to the present invention is a coil having a coil body portion formed by removing an unnecessary portion from a metal lump. Thereby, the coil of a free shape can be provided.

  Moreover, the manufacturing method of the coil which concerns on this invention is a manufacturing method of the coil which has the process of forming a coil main-body part by removing an unnecessary part from a metal lump. Thereby, the coil of a free shape is realizable.

BRIEF DESCRIPTION OF THE DRAWINGS It is a coil of Embodiment 1 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 2 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 3 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 4 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 5 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 6 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 7 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 8 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a coil of Embodiment 9 of this invention, (a) is a perspective view, (b) is an elevation view, (c) is a top view. It is a longitudinal cross-sectional view which passes along the central axis of the coil after impregnating the insulating resin to the coil of Embodiment 1.

  The present inventor has earnestly determined how to produce a free-form electromagnetic forming coil having sufficient durability even when the raw tube as a workpiece has a small diameter or high strength. investigated.

  As a result, it is possible to cut from a metal lump without adopting a method of winding a conductor having a cross-sectional shape such as a circle around the shaft center (that is, without being greatly restricted by the cross-sectional shape of the conductor and its material). By removing unnecessary portions by at least one of laser processing and electric discharge processing, a freely shaped coil (for example, a coil body portion having a helical shape and used for electromagnetic forming) is formed. I found for the first time that it was possible.

  The found results are not limited to electromagnetic forming coils, but can be widely applied to coils in general. For example, inductive heating coils for electro-welding, metal induction heating coils, large current transformer coils, large current motor coils, and the like may be used as coils other than those for electromagnetic forming. Hereinafter, embodiments of the present invention will be described in detail while illustrating the case of a coil for electromagnetic forming.

(Embodiment 1)
FIG. 1 is an electromagnetic forming coil as a coil according to the first embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view.

  In FIG. 1, reference numeral 1 denotes an electromagnetic forming coil for expanding and forming a raw pipe (not shown) as a workpiece, 1 a passes through the central axis of the electromagnetic forming coil 1, and extends from below to above in the drawing. A central axial conductor 1b for flowing current is connected to the central axial conductor 1a, that is, a radial conductor 1c for flowing current from the center of the electromagnetic forming coil 1 in the radial direction. It is connected to the outer peripheral side of the part 1b, that is, the outer peripheral part of the electromagnetic forming coil 1 goes around in the direction parallel to the axial direction while circling around the axis for flowing current spirally (set to 10 turns). The conductive wire portion 1d as the coil body portion of the configuration is connected to the lower end side of the conductive wire portion 1c, that is, a current flows from the lowermost end of the electromagnetic forming coil 1 further downward on the paper surface {return to (power supply device)} Down for A conductor portion.

  Note that the electromagnetic forming coil 1 shown in FIG. 1 is a billet as a metal block having a diameter of 70 mm made of a beryllium copper alloy and is a 5-axis machine (for example, at least one of cutting, laser machining, or electric discharge machining). By removing unnecessary portions, the central conductive portion 1a, the radial conductive portion 1b, the conductive portion 1c having a spiral shape of 10 turns (the outer diameter of the coil 1 is 60 mm) and the downward conductive portion 1d. Are manufactured continuously and integrally. Since the electromagnetic forming coil 1 is manufactured in such a manner, a conventional winding step is not required at all, and any material and any cross-sectional shape can be applied to the spiral conducting wire portion 1c. The electromagnetic forming coil as a whole can be formed into a free shape (for details, refer to an embodiment described later).

  The outer diameter of the electromagnetic forming coil 1 manufactured by the method as described above is 60 mm, the cross section of the conductor portion 1 c is a square of 8 mm × 8 mm, and the interval between the conductor portions 1 c of 10 turns is 2 mm. Each part of the electromagnetic forming coil 1 is wound with a glass cloth tape around it, impregnated with insulating resins 1i and 1j, and subjected to necessary post-processing such as terminal attachment as an electromagnetic tube expansion coil. Completed (see FIG. 10). In the present embodiment, the central conductor 1a, the radial conductor 1b, and the downward conductor 1d are continuously and integrally manufactured at the upper and lower ends of the spiral conductor 1c, respectively. However, the present invention is not necessarily limited thereto. For example, the conductors (the central axis direction conductor 1a, the radial conductor 1b, and the lower conductor 1d) from the helically shaped electromagnetic forming conductor 1c to the coil terminal are separately welded or mechanically joined. Is also possible. Further, if the distance between adjacent conductors of the spiral conductor part 1c for passing the current is too long, the number of turns per unit length in the axial direction is reduced, and the plastic deformation of the raw tube as the workpiece is performed. Therefore, the electric energy stored in the capacitor to be described later for securing a current necessary for obtaining a sufficient magnetic field required for the current increases, which is not appropriate in terms of economy. Also, if the distance between the conductive wires is too short, the electric field generated between the conductive wires is high, which causes a dielectric breakdown at an early stage, which is also not appropriate. That is, there is an appropriate range for the axial distance between the conductors (between the conductor portions 1c), and it is desirable that the distance is approximately in the range of 0.5 mm to 2 mm.

  Then, charges are stored in advance in a large-capacity, high-voltage capacitor, and a large current in the direction shown in FIG. 1 is passed through the coil according to the present invention (electromagnetic forming coil 1) to instantaneously form the electromagnetic forming coil 1. A very strong magnetic field is generated downward in the axial direction. This magnetic field induces an induced current in a direction opposite to the direction of the current of the lead wire portion 1c having a spiral shape in a raw tube as a workpiece placed outside the electromagnetic forming coil 1 shown in FIG. . Due to the induced current and the magnetic field, an electromagnetic force (Lorentzka) from the center of the electromagnetic forming coil 1 to the outside acts on the element tube, and plastic processing for expanding and forming the element tube becomes possible.

  The beryllium copper alloy billet has a 0.2% yield strength after heat treatment of about 1000 MPa (having a 0.2% yield strength of about 5 times that of oxygen-free copper used in conventional winding type electromagnetic forming coils). And the conductivity is about 20 IACS%. In the case of the coil (electromagnetic forming coil 1) according to the present invention, in order to achieve its effect, the 0.2% proof stress during use is 500 MPa or more, which is 2.5 times or more that of oxygen-free copper at room temperature. It is desirable. Further, from the viewpoint of suppressing the internal temperature rise of the electromagnetic forming coil 1 due to Joule heat generation, the electrical conductivity is preferably 15 IACS% or more at room temperature. When the heat treatment type alloy as described above is selected as the material of the conductive wire portion 1c having a spiral shape, it can be hardened by subjecting it to a spiral shape and then performing a ripening treatment. Regarding the above points, the same applies to the following embodiments.

  Therefore, when the raw tube as the workpiece has a small diameter (in the electromagnetic forming coil that performs pipe expansion forming as described above, it is necessary to insert it inside the raw tube. It is necessary to reduce the diameter of the forming coil.) And to form a free-form electromagnetic forming coil having sufficient durability performance even for lifting that is a high-strength raw tube. More specifically, in the case of expanding and forming a small-diameter element pipe using an electromagnetic forming coil having an outer diameter of 80 mm or less, it is possible to expect a longer life of the electromagnetic forming coil. In addition, when expanding a small-diameter element pipe as described above or electromagnetically forming a high-strength element pipe, conversely, a winding type electromagnetic forming coil (oxygen-free copper) with insufficient strength as in the prior art is used. When used repeatedly, there is a risk that the lead wire will be plastically deformed, and the lead wires may be broken or short-circuited with each other with a small number of repetitions.

  In addition, when the electromagnetic forming coil 1 is manufactured by the processing method according to the present invention, the cross section of the spiral lead portion 1c can be formed into a free shape (for example, an arbitrarily large cross sectional shape). As described above, the plastic deformation of the conductor portion 1c that generates an extremely strong magnetic field is hardly generated, and the life of the electromagnetic forming coil can be dramatically improved. Regarding the above points, the same applies to the following embodiments.

  In this embodiment, the case where a beryllium copper alloy is used as the conductive wire material for the electromagnetic forming coil has been described. However, the present invention is not necessarily limited to this, and a copper alloy, an aluminum alloy, or a titanium copper alloy is employed. It is also possible to do. Moreover, as a conducting wire material for the electromagnetic forming coil, it is desirable to cut the conducting wire from a metal lump or billet obtained by applying plastic working to the extruded rod instead of the extruded rod from the viewpoint of toughness and electrical conductivity. Regarding the above points, the same applies to the following embodiments.

(Embodiment 2)
FIG. 2 shows an electromagnetic forming coil as a coil according to the second embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view.

  In FIG. 2, reference numeral 2 denotes an electromagnetic forming coil for shrink-forming a raw pipe (not shown) as a workpiece, and 2a denotes an electric current from the lower side to the upper side of the paper on the outside of the electromagnetic forming coil 2. The outer conductor part 2b for flowing is connected to the outer conductor part 2a, that is, the radial conductor part 2c for passing a current from the outside of the electromagnetic forming coil 2 in the radial direction to the inner part of the radial conductor part 2b. Connected, that is, a configuration in which the outer periphery of the electromagnetic forming coil 2 travels in a direction parallel to the axial direction while circling around an axis for flowing a current spirally (set to 5 turns) from above to below The upper conductor portion 2e as the coil main body portion is connected to the upper conductor portion 2c, and the outer periphery of the coil 2 for electromagnetic forming is further turned downward around the axis for passing a current spirally (set to 5 turns). Do not go around The lower conductor portion 2d as a coil body portion configured to proceed in a direction parallel to the axial direction is connected to the lower end side of the lower conductor portion 2e, that is, further from the lower end of the electromagnetic forming coil 2 This is a downward conductor portion for flowing current downward (returning to (power supply device)).

  In addition, the electromagnetic forming coil 2 shown in FIG. 2 is a billet as a metal lump of φ100 mm made of a beryllium copper alloy (for example, at least one of cutting, laser machining, or electric discharge machining). By removing unnecessary portions, the outer conductor portion 2a, the radial conductor portion 2b, the upper conductor portion 2c having a 5-turn spiral shape (the outer diameter of the coil 2 is 60 mm), and the 5-turn spiral shape. The lower conductive wire portion 2e (the outer conductive wire portion 2c has an outer diameter of 60 mm) and the lower conductive wire portion 2d are manufactured continuously and integrally. Since the electromagnetic forming coil 2 is manufactured in this manner, the conventional winding process is not required at all, and the upper conductor portion 2c and the lower conductor portion 2e having a spiral shape are made of any material and any A cross-sectional shape can be applied, and the electromagnetic forming coil as a whole can have a free shape. Specifically, the cross section of the upper conductor portion 2c is a square of 8 mm × 8 mm, and the cross section of the lower conductor portion 2e is a rectangle of 12 mm × 8 mm. Thus, since the cross section of the lower conductor portion 2e is larger than the cross section of the upper conductor portion 2c, the heat generation is further reduced compared to the upper conductor portion 2c side when the base tube is formed by contraction. It is possible to make it. In addition, each space | interval between the upper side conductor part 2c and the lower side conductor part 2e is 2 mm. Further, the post-processing related to the electromagnetic forming coil 2 is basically the same as that of the first embodiment. In the present embodiment, it is easy to change the cross-sectional area of the spiral-shaped conductor part, which is difficult with the conventional winding type electromagnetic forming coil, and the spiral-shaped conductor part of the spiral-shaped conductor part can be changed. It is also possible to keep the material properties in the cross section uniform.

  Further, the plastic processing for forming a tube by shrinking the coil using the electromagnetic forming coil 2 is basically the same as the first embodiment described above in that it is based on electromagnetic force (Lorentzka).

  Moreover, the kind and characteristic of the conducting wire used for the electromagnetic forming coil 2 are basically the same as those in the first embodiment.

(Embodiment 3)
FIG. 3 shows an electromagnetic forming coil as a coil according to a third embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view.

  In FIG. 3, 3 is an electromagnetic forming coil for expanding and forming a raw pipe (not shown) as a workpiece, 3 a passes through the central axis of the electromagnetic forming coil 3, and extends from below to above in the drawing. The central axial conductor 3 and 3b are connected to the central axial conductor 3a. That is, the radial conductor 3c and 3c are radial conductors for passing current in the radial direction from the center of the electromagnetic forming coil 3. It is connected to the outer peripheral portion side of the portion 3b, that is, parallel to the axial direction while circling around the shaft for flowing current in a spiral shape (5-turn setting) from the upper portion to the lower portion of the coil 3 for electromagnetic forming. The upper conductor portion 3e as a coil main body portion configured to travel in any direction is connected to the upper conductor portion 3c, and the outer periphery of the coil 3 for electromagnetic forming is further spirally downward (set to 5 turns). To shed The lower conductor portion 3d as a coil body portion configured to travel in a direction parallel to the axial direction while circling around the shaft is connected to the lower end side of the lower conductor portion 3e, that is, the electromagnetic forming coil 3 This is a downward conducting wire portion for flowing a current from the bottom end further downward in the drawing (return to (power supply device)). In addition, this embodiment is invention of the structure which carried out compromise of Embodiment 1 and 2, Naturally there exists an effect which put both together. That is, a free-form electromagnetic forming coil having sufficient durability can be manufactured even when the raw tube as a workpiece is small in diameter or lifted as a high-strength raw tube. The cross section of the upper conductor portion 3c is a square of 8 mm × 8 mm, and the cross section of the lower conductor portion 3e is a rectangle of 12 mm × 8 mm. Thus, since the axial length of the cross-section of the lower conductor portion 3e is larger than the axial length of the cross-section of the upper conductor portion 3c, when the tube is expanded, compared to the upper conductor portion 3c side. It is also possible to increase the electromagnetic force generated on the lower conductor portion 3e side. However, since the cross-sectional area of the lower conductor portion 3e is larger than the cross-sectional area of the upper conductor portion 3c, the amount of heat generated on the lower conductor portion 3e side is further reduced compared to the upper conductor portion 3c side. Is possible. In addition, each space | interval between the upper side conductor part 3c and the lower side conductor part 3e is 2 mm. Further, the post-processing related to the electromagnetic forming coil 3 is basically the same as that of the first and second embodiments.

(Embodiment 4)
FIG. 4 shows an electromagnetic forming coil as a coil according to a fourth embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view.

  In FIG. 4, 4 is an electromagnetic forming coil for expanding and forming a raw pipe (not shown) as a workpiece, and 4a passes through the central axis of the electromagnetic forming coil 4 and extends from below to above in the drawing. The central axial conductor 4 and 4b are connected to the central axial conductor 4a. That is, the radial conductor 4c and 4c are radial conductors for passing current in the radial direction from the center of the electromagnetic forming coil 4. It is connected to the outer peripheral side of the portion 4b, that is, parallel to the axial direction while circling around the axis for flowing a current spirally (three-turn setting) from the upper side to the lower side of the coil 4 for electromagnetic forming. The upper conductor portion 4e as a coil body portion configured to travel in a specific direction is connected to the upper conductor portion 4c, and the outer periphery of the coil 4 for electromagnetic forming is further spirally downward (set to 5 turns). To shed An intermediate conductor portion as a coil body portion configured to travel in a direction parallel to the axial direction while circling around the shaft, the lower 4c is connected to the intermediate conductor portion 4e, and the outer periphery of the electromagnetic forming coil 4 is Further, the lower conductor portion 4d as a coil main body portion configured to advance in a direction parallel to the axial direction while circling around a shaft for flowing current spirally (set to 3 turns) It is a lower conductor part connected to the lower end side of the side conductor part 4c, that is, a lower conductor part for flowing a current {return to (power supply device)} from the lowermost end of the electromagnetic forming coil 4 further downward in the drawing. In the present embodiment, the shape of the electromagnetic forming coil can be freely changed according to the shape of a workpiece (not shown) like the electromagnetic forming coil 4. The cross section of the upper and lower conductor portions 4c is a square of 8 mm × 8 mm, and the cross section of the intermediate conductor portion 4e is a rectangle of 8 mm × 12 mm. Thus, since the cross section of the intermediate conductor portion 4e is larger than the cross section of the upper and lower conductor portions 4c, when the tube is expanded, the cross section of the intermediate conductor portion 4e is larger than that of the upper and lower conductor portions 4c. It is possible to further reduce the amount of heat generation. The intervals between the upper and lower conductor portions 4c and between the intermediate conductor portions 4e are 2 mm. Moreover, the post-process regarding this electromagnetic forming coil 4 is basically the same as in the first to third embodiments.

(Embodiment 5)
FIG. 5 shows an electromagnetic forming coil as a coil according to the fifth embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view.

  In FIG. 5, 5 is an electromagnetic forming coil for expanding and forming a raw pipe (not shown) as a workpiece, and 5 a passes through the central axis of the electromagnetic forming coil 5 and extends from the bottom to the top of the page. A central axial conductor portion 5b for flowing current is connected to the central axial conductor portion 5a, that is, a radial conductor portion 5c for flowing current in the radial direction from the center of the electromagnetic forming coil 5 is a radial conductor. It is connected to the outer peripheral side of the part 5b, that is, parallel to the axial direction while circling around the axis for flowing current spirally (set to 5 turns) from the upper side to the lower side of the coil 5 for electromagnetic forming. The upper conductor portion 5f as a coil body portion configured to proceed in any direction is connected to the upper conductor portion 5c, and a connecting conductor portion formed downward in parallel to the axial direction of the electromagnetic forming coil 5, Side 5c is connected The wire 5f is connected to the wire portion 5f and travels in a direction parallel to the axial direction while circling around an axis for flowing current in a spiral shape (5-turn setting) on the outer periphery of the coil 5 for electromagnetic forming further downward. The lower conductor portion 5d as a coil body portion having a simple structure is connected to the lower end side of the lower conductor portion 5c, that is, a current is passed from the lowermost end of the electromagnetic forming coil 5 further downward on the paper surface {(power supply It is a downward conducting wire portion for returning to the device. In addition, in this embodiment, when the place which wants to shape | mold in the raw | natural pipe | tube (not shown) as a to-be-processed material is separated in the axial direction like the electromagnetic forming coil 5 to illustrate, it illustrates. It is possible to form a conductive wire that is connected at a distance such as the upper conductive wire portion 5c and the lower conductive wire portion 5c having a spiral shape. Thus, it is possible to freely change the shape of the electromagnetic forming coil in accordance with the shape of the portion where tube expansion is desired. The cross section of the upper and lower conductor portions 5c is a square of 8 mm × 8 mm. In addition, each space | interval between the upper side and the lower side conductor part 5c is 2 mm. Moreover, the post-process regarding this electromagnetic forming coil 5 is basically the same as in the first to fourth embodiments.

(Embodiment 6)
FIG. 6 shows an electromagnetic forming coil as a coil according to a sixth embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view. The difference between the present embodiment and the first embodiment lies in the coil shape when the electromagnetic forming coil is viewed from the axial direction (that is, as viewed from above), and will be described in detail below.

  In FIG. 6, 6 is an electromagnetic forming coil having an elliptical top view for expanding and forming a raw tube (not shown) as a workpiece, 6a passes through the central axis of the electromagnetic forming coil 6, A central axial conductor 6b for flowing current from below to above is connected to the central axial conductor 6a, that is, an outward conducting conductor 6c for allowing current to flow outward from the center of the coil 6 for electromagnetic forming. Is connected to the outer peripheral portion side of the outward conducting wire portion 6b, that is, a coil main body portion configured to advance in a direction parallel to the axial direction while circling around a shaft for flowing current to the outer peripheral portion of the electromagnetic forming coil 6 The lead wire portion 6d, which is set to 10 turns, is connected to the lower end side of the lead wire portion 6c, that is, the current flows from the lowermost end of the electromagnetic forming coil 6 further downward on the paper surface {return to (power supply device)} Down for A conductor portion. In the present embodiment, like the electromagnetic forming coil 6, it is possible to freely manufacture the shape of the electromagnetic forming coil according to the shape (elliptical shape) of the workpiece (not shown). . In other words, it is possible to manufacture the conductive wire portion 6c configured so as to go around in the direction parallel to the axial direction while circling around the axis as the coil body portion so that the top view is elliptical.

(Embodiment 7)
FIG. 7 is a coil for electromagnetic forming as a coil according to a seventh embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view. The difference between this embodiment and Embodiments 1 and 6 is the coil shape when the electromagnetic forming coil is viewed from the axial direction (that is, when viewed from the top), and will be described in detail below. .

  In FIG. 7, 7 is an electromagnetic forming coil having a square top view for expanding and forming a raw pipe (not shown) as a workpiece, and 7 a passes through the central axis of the electromagnetic forming coil 7 and is below the paper surface. A central axial conductor portion 7b for flowing current upward from 7b is connected to the central axial conductor portion 7a, that is, an outward conductive wire portion 7c for flowing current outward from the center of the electromagnetic forming coil 7. As a coil body portion connected to the outer peripheral portion side of the outward conducting wire portion 7b, that is, configured to advance in a direction parallel to the axial direction while circling around the shaft for flowing current to the outer peripheral portion of the electromagnetic forming coil 7. The lead wire portion 7d set to 10 turns is connected to the lower end side of the lead wire portion 7c, that is, the current flows from the lowermost end of the electromagnetic forming coil 7 further downward on the paper surface {to return to the (power supply device)}. Down It is a line part. In the present embodiment, like the electromagnetic forming coil 7, the shape of the electromagnetic forming coil can be freely manufactured according to the shape of the workpiece (not shown) (element tube having a square cross section). Is possible. That is, it is possible to manufacture the conductive wire portion 7c configured to go around in the direction parallel to the axial direction while circling around the axis as the coil body portion so that the top view is square. Note that the square conducting wire portion 7c has four combinations of a straight portion 7g and a corner portion 7h having an inner radius of curvature R of 10 mm or less.

(Embodiment 8)
FIG. 8 shows an electromagnetic forming coil as a coil according to an eighth embodiment of the present invention, where (a) is a perspective view, (b) is an elevation view, and (c) is a plan view. The difference between the present embodiment and the seventh embodiment lies in the coil shape when the electromagnetic forming coil is viewed from the axial direction (that is, as viewed from above), and will be described in detail below.

  In FIG. 8, 8 is an electromagnetic forming coil having a rectangular top view for expanding and forming a raw pipe (not shown) as a workpiece, and 8a passes through the central axis of the electromagnetic forming coil 8 and below the paper surface. A central axial conductor 8b for flowing current upward from 8a is connected to the central axial conductor 8a, that is, an outward conductive conductor 8c for flowing current outward from the center of the electromagnetic forming coil 8 As a coil body portion connected to the outer peripheral portion side of the outward conducting wire portion 8b, that is, configured to advance in a direction parallel to the axial direction while circling around an axis for flowing current to the outer peripheral portion of the electromagnetic forming coil 8. The lead wire portion 8d set to 10 turns is connected to the lower end side of the lead wire portion 8c, that is, to allow current to flow from the lowest end of the electromagnetic forming coil 8 further downward on the paper surface (return to (power supply device)). Down It is a line part. In the present embodiment, like the electromagnetic forming coil 8, the shape of the electromagnetic forming coil can be freely manufactured according to the shape of the workpiece (not shown) (element tube having a rectangular cross section). Is possible. That is, it is possible to manufacture the conductive wire portion 8c configured so as to go around in the direction parallel to the axial direction while circling around the axis as the coil body portion so that the top view is rectangular. The rectangular conductor portion 8c has four combinations of a straight portion 8g and a corner portion 8h having a radius of curvature R of 10 mm or less inside.

(Embodiment 9)
FIG. 9 shows a coil for electromagnetic forming as a coil according to the ninth embodiment of the present invention, in which (a) is a perspective view, (b) is an elevation view, and (c) is a plan view. The difference between the present embodiment and the seventh and eighth embodiments lies in the coil shape when the electromagnetic forming coil is viewed from the axial direction (that is, as viewed from above), and will be described in detail below. .

  In FIG. 9, 9 is an electromagnetic forming coil having a pentagonal shape when viewed from the top for expanding and forming a raw tube (not shown) as a workpiece, and 9a passes through the central axis of the electromagnetic forming coil 9 and below the paper surface. A central axial conductor 9b for flowing current upward from 9b is connected to the central axial conductor 9a, that is, an outward conductive conductor 9c for flowing current outward from the center of the coil 9 for electromagnetic forming. As a coil body portion connected to the outer peripheral portion side of the outward conducting wire portion 9b, that is, configured to advance in a direction parallel to the axial direction while circling around an axis for flowing current to the outer peripheral portion of the electromagnetic forming coil 9 The lead wire portion 9d, which is set to 10 turns, is connected to the lower end side of the lead wire portion 9c, that is, to allow current to flow from the lowest end of the electromagnetic forming coil 9 further downward on the paper surface (return to (power supply)). Down It is a line part. In the present embodiment, like the electromagnetic forming coil 9, the shape of the electromagnetic forming coil can be freely manufactured according to the shape of the workpiece (not shown) (element tube having a rectangular cross section). Is possible. That is, it is possible to manufacture the lead wire portion 9c configured to go around in the direction parallel to the axial direction while circling around the axis as the coil body portion so that the top view forms a pentagon. The pentagonal conductive wire portion 9c has five combinations of a straight portion 9g and a corner portion 9h having a radius of curvature R of 10 mm or less on the inside.

  In Embodiments 7 to 9 described above, examples in which the top view of the electromagnetic forming coil is a square, a rectangle, and a pentagon have been described. However, the present invention is not limited to these examples. The present invention can be widely applied to an electromagnetic forming conductor portion as a coil body portion configured to proceed in a parallel direction and having a polygonal shape when viewed from above. The polygonal shape is composed of a plurality of linear portions and three or more corner portions, and a radius of curvature R inside the corner portions is 10 mm or less.

  Moreover, in Embodiment 1-9 mentioned above, although either the pipe expansion shaping | molding or the tube contraction shaping | molding was demonstrated, it is not limited to either, It is applicable with respect to both. In the first to ninth embodiments described above, only the electromagnetic forming coil has been described. However, the present invention is not limited thereto, and can be applied to a wide range of coils without departing from the technical idea of the present invention. For example, inductive heating coils for electric resistance welding, metal induction heating coils, large current transformers, large current motors and the like can be considered as coils other than those for electromagnetic forming.

1, 2, 3, 4, 5, 6, 7, 8, 9 Electromagnetic forming coils 1a, 3a, 4a, 5a, 6a, 7a, 8a, 9a
1b, 2b, 3b, 4b, 5b Radial conductor part 1c, 6c, 7c, 8c, 9c Conductor part 1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d, 9d Down conductor part 1i, 1j Insulation Resin 2a Outer conductor portion 2c, 3c, 4c Upper conductor portion 2e, 3e Lower conductor portion 4c Upper conductor portion and lower conductor portion 4e Intermediate conductor portion 5c Upper conductor portion and lower conductor portion 5f Connection conductor portions 6b, 7b, 8b, 9b Outward conductor portion 7g, 8g, 9g Straight portion 7h, 8h, 9h Corner portion

Claims (10)

A coil body portion that is formed by removing unnecessary portions from the metal lump , and is configured to advance in a direction parallel to the axial direction from one end to the other while circulating around the shaft,
One conductor portion electrically connected to one end of the coil body portion and projecting to the one end side from the coil body portion;
An electromagnetic forming coil comprising: another conductive wire portion electrically connected to the other end of the coil main body portion and projecting toward the one end side from the coil main body portion . The electromagnetic forming coil according to claim 1, wherein the unnecessary portion is removed by at least one of cutting, laser processing, and electric discharge machining. Coil body portion of the orbiting and as it progresses in the direction parallel to the axial direction while constituting about said axis, electromagnetic forming coil of claim 1 or claim 2, characterized in that to name a helical shape. Coil body portion of the orbiting and as it progresses in the direction parallel to the axial direction while constituting about said axis, electromagnetic according to claim 1 or claim 2, characterized in that to the top view the name of the polygonal shape Coil for molding . 5. The electromagnetic forming according to claim 4 , wherein the polygonal shape includes a plurality of linear portions and three or more corner portions, and a radius of curvature R inside the corner portions is 10 mm or less . coil. 6. The non-magnetic metal alloy according to claim 3, wherein the metal mass is a nonmagnetic metal alloy having a 0.2% proof stress at room temperature of 500 MPa or more and a conductivity of 15 IACS% or more. The coil for electromagnetic forming as described in 2.
Here, IACS is International Annealed Copper Standard (International Annealed Copper Wire Standard). A method for producing an electromagnetic forming coil by removing unnecessary portions from a metal lump ,
Forming a coil body portion that is configured to travel in a direction parallel to the axial direction from one end to the other while rotating around the axis;
Forming one conductive wire portion electrically connected to one end of the coil body portion and projecting to the one end side from the coil body portion;
The coil is electrically connected to the other end of the body portion, the method for producing a coil for electromagnetic forming of chromatic and forming the other lead wire protruding at one end of the coil body. The method for manufacturing a coil for electromagnetic forming according to claim 7 , wherein the unnecessary portion is removed by at least one of cutting, laser processing, and electric discharge machining. Coil body portion of the orbiting and as it progresses in the direction parallel to the axial direction while constituting about said axis of the coil electromagnetic forming according to claim 7 or claim 8, characterized in that to name a helical shape Production method. Coil body portion of the orbiting and as it progresses in the direction parallel to the axial direction while constituting about said axis, electromagnetic according to claim 7 or claim 8, characterized in that to the top view the name of the polygonal shape A method for manufacturing a forming coil.

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