Electric pulse decomposition method, composite material, composite material decomposition method

Abstract

To provide an electric pulse decomposition method that causes insulation breakdown with a simple manner, causes an impulse wave generated by insulation breakdown electric current, or the like, to act in an insulation member functioning as an adhesive, so as to effectively break the insulation member, thereby, enabling a plurality of conductors to separate from a composite material.SOLUTION: An electric pulse decomposition method for separating, by electric pulses, a composite material 1 joined or coupled with a plurality of conductors (7, 8) via an insulation member 9, includes: a protrusion formation process S1 of forming a protrusion 10 at a specific part on a side where the composite material 1 of at least one conductor (7) of the plurality of conductors is located; and a separation process S2 of separating the plurality of conductors (7, 8) in the composite material 1 through breaking the insulation member 9 by bringing electrodes (positive electrode 12, negative electrode 14) into contact with each surface of the plurality of conductors to apply an electric pulse between the electrodes.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric pulse decomposition method, a composite material, and a method for decomposing a composite material. [Background technology]

[0002] In recent years, a car body assembly method in which multiple conductor parts that make up the car body are joined or bonded together using an adhesive is becoming more widespread. This method contributes to reducing the weight of the car body, and is showing signs of being widespread both domestically and internationally. On the other hand, there is also a movement to dismantle scrapped car bodies into multiple component parts and reuse those parts that can be reused. For composite materials in which multiple conductors among the component parts are joined or bonded together with an insulating member that functions as an adhesive, an electric pulse decomposition method may be applied in which an electric pulse is applied to break the adhesive and separate the multiple conductors. More generally, there has also been a proposal for an improvement in a method of disassembling an object in which an insulator and a conductor are joined or bonded together by using an electric pulse (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-69454 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology of Patent Document 1, a plurality of electrodes are placed at spaced positions on the surface of an object in which an insulator and a conductor are bonded or joined, and a voltage is applied between the electrodes to decompose the object into an insulator and a conductor. However, the technology of Patent Document 1 does not consider the spatial position where the electric field caused by the application of the voltage is concentrated. In order to generate an electric field concentration at a desired position to destroy the insulating member, it is necessary to apply a thin wire for applying the voltage, but there is a difficulty in selecting the portion where the thin wire is to come into contact with the conductor.

[0005] The present invention aims to provide an electric pulse decomposition method, a composite material, and a composite material decomposition method that can generate dielectric breakdown in a simple manner, and act on an insulating material that functions as an adhesive with shock waves, heat, material vaporization expansion, etc. (hereinafter referred to as shock waves, etc.) generated by the dielectric breakdown and the accompanying discharge, thereby effectively destroying the insulating material and separating multiple conductors from the composite material. [Means for solving the problem]

[0006] (1) An electric pulse decomposition method for separating a composite material (e.g., composite material 1 described later) in which a plurality of conductors (e.g., a first conductor 7 and a second conductor 8 described later) are joined or bonded with an insulating member (e.g., insulating member 9 described later) by using an electric pulse, the electric pulse decomposition method including: a convex portion forming step (e.g., convex portion forming step S1 described later) for forming a convex portion (e.g., convex portion 10 described later) at a specific portion on a side of at least one conductor (e.g., first conductor 7 described later) among the plurality of conductors, on which the insulating member is disposed; and a separation step (e.g., separation step S2 described later) for separating the plurality of conductors in the composite material by bringing electrodes (e.g., positive electrode 12 and negative electrode 14 described later) into contact with a surface of each of the plurality of conductors and applying an electric pulse between the electrodes to destroy the insulating member.

[0007] (2) A composite material (for example, composite material 1 described later) in which a predetermined first conductor (for example, first conductor 7 described later) and a second conductor (for example, second conductor 8 described later) are joined or bonded by an insulating member (for example, insulating member 9 described later) and separated by an electric pulse, the composite material (for example, composite material 1 described later) having a convex portion (for example, convex portion 10 described later) formed on at least one of the first conductor or the second conductor (for example, first conductor 7 described later) so as to protrude toward the other (for example, second conductor 8 described later), and an insulating member (for example, insulating member 9 described later) applied to an area including the portion where the convex portion is formed and joining or bonding the first conductor and the second conductor (for example, composite material 1 described later).

[0008] (3) A composite material forming process (e.g., a composite material forming process S81 described later) in which an insulating member (e.g., an insulating member 9 described later) is applied to a first conductor (e.g., a first conductor 7 described later) having a predetermined convex portion (e.g., a convex portion 10 described later) and the first conductor and a second conductor (e.g., a second conductor 8 described later) located on the protruding end side of the convex portion are joined or bonded with the insulating member to form a composite material (e.g., a composite material 1 described later); and a separation process (e.g., a separation process S82 described later) in which an electric pulse is applied between the first conductor and the second conductor to break down the insulating member and separate the first conductor and the second conductor. Composite decomposition method.

[0009] (4) The electric pulse decomposition method according to (1), wherein the height of the protrusion is at least three-quarters of the thickness dimension of the insulating member.

[0010] (5) A composite material according to (2), wherein the height of the protrusion is at least three-quarters of the thickness dimension of the insulating member.

[0011] (6) The method for disassembling a composite material according to (3), wherein the height of the protrusion is at least three-quarters of the thickness dimension of the insulating member.

[0012] (7) The electric pulse decomposition method according to (4), wherein an insulating film is formed on the other of the plurality of conductors, and the protrusion is in contact with the film.

[0013] (8) A composite material according to (5), in which an insulating film is formed on the other of the plurality of conductors, and the protrusion is in contact with the film.

[0014] (9) The method for disassembling a composite material according to (6), wherein an insulating film is formed on the other conductor of the plurality of conductors, and the protrusion is in contact with the film. Effect of the Invention

[0015] In the electric pulse decomposition method (1), dielectric breakdown is likely to occur between the convex portion formed in the convex portion formation process and the conductor adjacent to and facing the convex portion. By inducing shock waves or the like generated by the dielectric breakdown current in the insulating material, the insulating material can be effectively destroyed and the multiple conductors that constitute the composite material can be separated.

[0016] In the composite material (2), dielectric breakdown is likely to occur between the tip of the convex portion and the first conductor or the second conductor adjacent to and facing the tip, and the shock wave generated by the dielectric breakdown current does not escape to the surrounding insulating material, effectively destroying the insulating material and separating the multiple conductors that constitute the composite material.

[0017] In the composite disassembly method of (3), in the composite formation step, an insulating material that functions as an adhesive is applied to a first conductor that already has a convex portion, and the first conductor and a second conductor located on the protruding end side of the convex portion are joined or bonded to form a composite material. Therefore, when an electric pulse is applied to the first conductor and the second conductor in the separation step, dielectric breakdown is likely to occur between the convex portion of the first conductor and the second conductor that faces the convex portion in close proximity to the convex portion. This makes it possible to effectively destroy the insulating material by shock waves generated by the dielectric breakdown current, and separate the multiple conductors that constitute the composite material.

[0018] In the electric pulse decomposition method (4), the height of the protrusions is appropriate, making it easier for dielectric breakdown to occur when an electric pulse is applied. The dielectric breakdown current creates shock waves and other effects in the insulating material, which effectively destroys the insulating material. This makes it easy to separate the multiple conductors that make up the composite material.

[0019] In the composite material (5), the height of the protrusions is appropriate, making it easier for dielectric breakdown to occur when an electric pulse is applied, and the shock waves generated by the breakdown current can effectively destroy the insulating material and separate the multiple conductors that make up the composite material.

[0020] In the composite material disassembly method (6), the height of the protrusions is appropriate, making it easier for dielectric breakdown to occur when an electric pulse is applied. The dielectric breakdown current creates shock waves and other effects in the insulating material, which effectively destroy the insulating material and separate the multiple conductors that make up the composite material.

[0021] In the electric pulse decomposition method (7), the mechanism for controlling the thickness of the insulating material that functions as an adhesive when the protrusion comes into contact with the film and the mechanism for accurately inducing dielectric breakdown and effectively destroying the insulating material are the same, resulting in simplification.

[0022] In the composite material (8), when the protrusions come into contact with the film, the mechanism for controlling the thickness of the insulating material that functions as an adhesive and the mechanism for accurately inducing dielectric breakdown and effectively destroying the insulating material are the same, thereby simplifying the process.

[0023] In the composite decomposition method (9), the mechanism for controlling the thickness of the insulating material that functions as an adhesive when the protrusion comes into contact with the film and the mechanism for accurately inducing dielectric breakdown and effectively destroying the insulating material are the same, thereby simplifying the process. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a conceptual diagram showing an overview of the present invention. [Diagram 2] FIG. 1 illustrates one embodiment of the present invention. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] FIG. 4 is a diagram showing the dimensions of the protrusions defined in FIG. 3 and test results. [Diagram 5] FIG. 3 shows a modification of the embodiment of FIG. 2. [Figure 6] FIG. 1 is a process diagram showing an electric pulse decomposition method according to one embodiment of the present invention. [Figure 7] FIG. 2 is a diagram illustrating a path of dielectric breakdown that occurs during the implementation of the present invention. [Figure 8]1 is a process diagram showing a composite material disassembly method according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Fig. 1 is a conceptual diagram showing an overview of the present invention. The present invention relates to a method for separating a composite material, which is made of conductors such as steel plates joined or bonded together with an adhesive, into each conductor by applying an electric pulse, and to a composite material suitable for the method. In Fig. 1, while the composite material 1 is held by a holding device 2, a high voltage pulse is applied between the upper and lower surfaces of the composite material 1 from a high voltage pulse generator 3.

[0026] The gripping device 2 holds the composite material 1 at one side and the other side between a fixed gripping member 5 and a movable gripping member 6 provided on a base 4, and grips the composite material 1 so as to maintain a horizontal posture. The composite material 1 is formed by joining or bonding a first conductor 7 on the upper side and a second conductor 8 on the lower side with an insulating member 9 that functions as an adhesive. A convex portion 10 that protrudes toward the second conductor 8 is formed on a surface of the first conductor 7 facing the second conductor 8 at a specific portion.

[0027] A positive electrode 12 is connected to an end of a positive cable 11 extending from the high-voltage pulse generator 3, and is brought into contact with the upper surface of the first conductor 7. A negative electrode 14 is connected to an end of a negative cable 13 extending from the high-voltage pulse generator 3, and is brought into contact with the lower surface of the second conductor 8.

[0028] In one embodiment of the present invention, a high-voltage pulse, which is an electrical pulse generated by a high-voltage pulse generator 3, is applied between the positive electrode 12 and the negative electrode 14, and the insulating member 9, which functions as an adhesive, is destroyed by a shock wave generated by a breakdown current, etc., thereby separating the first conductor 7 and the second conductor 8.

[0029] Fig. 2 is a diagram showing one embodiment of the present invention, and Fig. 3 is an enlarged view of part A in Fig. 2. In Figs. 2 and 3, parts corresponding to those in Fig. 1 are given the same reference numerals. For example, a first conductor 7 and a second conductor 8, both of which are steel plates, are joined or bonded by an insulating member 9 that functions as an adhesive to form a composite material 1. A positive electrode 12 is abutted against the upper surface, which is the outer surface, of the first conductor 7. A negative electrode 14 is abutted against the lower surface, which is the outer surface of the second conductor 8.

[0030] A protrusion 10 protruding toward the second conductor 8 is formed on the underside of the first conductor 7, which faces the second conductor 8. The protrusion 10 may be formed as a protrusion on the opposite side of the first conductor 7 by striking the outer surface of the first conductor 7 with a punch to form a recess. Alternatively, the protrusion 10 may be formed by piling up a welded piece of the conductor using a welding machine at a location on the underside of the first conductor 7, which faces the second conductor 8, where the protrusion 10 is to be formed. The second conductor 8 is an electrodeposition-coated steel plate having an insulating electrodeposition coating 15 formed on the surface facing the insulating member 9.

[0031] The protrusions 10 are formed in order to facilitate the generation of shock waves or the like due to dielectric breakdown between the first conductor 7 and the second conductor 8 when a high-voltage electric pulse is applied between the first conductor 7 and the second conductor 8 using the positive electrode 12 and the negative electrode 14. In other words, the protrusions 10 reduce the dielectric strength between the conductors 7 and 8, making dielectric breakdown more likely to occur.

[0032] Dielectric breakdown is a well-known phenomenon, but we will briefly explain it. When a high voltage is applied between positive and negative electrodes facing each other across a gap, the electrons that were originally in the gap start to move toward the positive electrode, and the positive ions start to move toward the negative electrode. At this time, the electrons collide with the molecules floating in the gap at high speed, causing electrons to be emitted from the floating molecules. If the electrons thus emitted further emit electrons from the floating molecules, an electron avalanche occurs, causing dielectric breakdown in the gap.

[0033] The inventors conducted various experiments, using various materials for the base material of the portion forming the protrusion 10 and for the insulating member 9 that functions as an adhesive, and varying the voltage applied between the positive electrode 12 and the negative electrode 14 for each combination to find the shape of the protrusion 10 that is likely to cause insulation breakdown among various conditions. In other words, the inventors obtained a verification result that showed that it is desirable for the shape of the protrusion 10 to be a cone-shaped body that is pointed from the first conductor 7 side toward the second conductor 8 side.

[0034] Since an insulating member 9 that functions as an adhesive is interposed between the first conductor 7 and the second conductor 8, a notch with a V-shaped cross section is formed on the insulating member 9 side corresponding to the cone-shaped protrusion 10.

[0035] Next, the dimensions of each part of the protrusion 10 are defined with reference to Fig. 3, which is an enlarged view of part A in Fig. 2. The diameter of the base of the cone, which is the imaginary boundary between the convex part 10, which is a cone-shaped body pointed downward, and the first conductor 7, is defined as diameter D. The protrusion dimension from the base of the cone, which is the imaginary boundary between the convex part 10 and the first conductor 7, toward the second conductor 8 is defined as height H. The gap between the top of the convex part 10 and the upper surface of the second conductor 8 is defined as G. The diameter of an imaginary circle inscribed in the top of the convex part 10, which is a cone-shaped body pointed downward, is defined as R. This R is the diameter corresponding to the radius of curvature r of the top of the convex part 10.

[0036] FIG. 4 is a diagram showing the dimensions of the protrusion 10 defined in FIG. 3 and the test results. As a preset condition in the test, the distance between the bottom surface of the first conductor 7 and the top surface of the second conductor 8, which is the thickness dimension of the insulating member 9 functioning as an adhesive, is set to approximately 4 mm. The unit of the diameter D is mm, and the values ​​were set to 2, 4, (6), and 8. Note that (6) is a predicted value. The unit of the gap G and the corresponding height H (also shown in parentheses) is mm, and the values ​​were set to 1.5 (2.5), 1.0 (3.0), 0.5 (3.5), and 0.0 (4.0). The values ​​shown in parentheses in the test results are predicted values.

[0037] In FIG. 4, the test result "highly effective" means that even if the voltage applied between the positive electrode 12 and the negative electrode 14 is relatively low, a dielectric breakdown occurs between the first conductor 7 and the second conductor 8. In this state, the insulating member 9 that functions as an adhesive can be broken down without a high applied voltage, and the first conductor 7 and the second conductor 8 can be separated. On the other hand, "almost no effect" means that even if the applied voltage is relatively high, no dielectric breakdown occurs and the first conductor 7 and the second conductor 8 cannot be separated. Also, "somewhat effective" means that a dielectric breakdown can occur, although not as effectively as in the case of "highly effective".

[0038] From the test results in Figure 4, the following trends can generally be seen. That is, it can be seen that the smaller R is and the sharper the top of the protrusion 10 is, the more likely it is that dielectric breakdown will occur even if the diameter D and gap G are large. Also, when the gap G exceeds a certain limit, dielectric breakdown does not occur regardless of the values ​​of R and D. In short, it was confirmed that generally good results were obtained when the height H of the protrusion 10 was three-quarters or more of the thickness dimension of the insulating member 9. Also, the smaller the gap G is, the more likely it is that dielectric breakdown will occur.

[0039] When the gap G is 0.0, that is, when the top of the protrusion 10 is in contact with the second conductor 8, it is possible to reliably cause dielectric breakdown regardless of the diameter D or R. That is, even if the protrusion 10 is hemispherical as shown in FIG. 5, which is a modified example of this embodiment, dielectric breakdown can be reliably caused. In FIG. 5, the same reference numerals are used to denote parts corresponding to those in FIG. 2 and FIG. 3, and the explanation of the same reference numerals is used to explain each part. As described with reference to FIG. 2 and FIG. 3, since the insulating electrodeposition coating film 15 is formed on the second conductor 8, even if the top of the protrusion 10 contacts the second conductor 8, electrical conduction does not occur at the contact site.

[0040] When the tip of the protrusion 10 is in contact with the second conductor 8, it is possible to reliably cause dielectric breakdown regardless of the diameter D or R. This means that by providing the protrusion 10, it is possible to control the thickness of the insulating member 9, which is the distance between the first conductor 7 and the second conductor 8, by controlling its height H. Conventionally, it was difficult to control the thickness of the insulating member 9 that functions as an adhesive, and this control was carried out by putting beads or the like into the adhesive. In contrast, according to the present invention, by providing the protrusion 10, its height H also contributes to control the thickness of the insulating member 9 that functions as an adhesive. In other words, the mechanism for controlling the thickness of the insulating member 9 that functions as an adhesive and the mechanism for effectively destroying the insulating member 9 by accurately causing dielectric breakdown are the same.

[0041] FIG. 6 is a process diagram showing an electric pulse decomposition method according to one embodiment of the present invention. In FIG. 6, the description will be given with reference to the already-mentioned FIGS. 1 to 3 as appropriate. This electric pulse decomposition method includes a convex portion forming step S1 and a separation step S2. In the convex portion forming step S1, a convex portion 10 is formed at a specific portion of the first conductor 7, which is at least one of the first conductor 7 and the second conductor 8, which are a plurality of conductors, on a side where an insulating member 9 functioning as an adhesive is disposed. The convex portion 10 is formed, for example, as described above, by striking the outer surface side of the first conductor 7 with a punch to form a concave portion, and forming a convex portion on the opposite surface.

[0042] In the separation step S2, in an electrode abutment step S21, the positive electrode 12 is abutted against the first conductor 7, and the negative electrode 14 is abutted against the second conductor 8. Next, in an electric pulse application step S22, a high-voltage electric pulse is applied between the positive electrode 12 and the negative electrode 14 from the high-voltage pulse generator 3 through the positive cable 11 and the negative cable 13.

[0043] When an electric pulse is applied in this manner, a shock wave or the like is generated due to dielectric breakdown between the protruding end of the convex portion 10 and the second conductor 8. By generating the action of this shock wave or the like in the insulating material, the insulating material is effectively destroyed. As a result of the destruction of the insulating material 9 functioning as an adhesive in this manner, the first conductor 7 and the second conductor 8 that constitute the composite material 1 are separated.

[0044] Fig. 7 is a diagram for explaining the principle of the path of dielectric breakdown that occurs during the implementation of the present invention. The same reference numerals are used for corresponding parts from (A) to (D) in Fig. 7. As shown in (A) of Fig. 7, in air 16, dielectric breakdown occurs when the voltage between the first conductor 7 and the second conductor 8 exceeds the dielectric breakdown strength of 3 KV / mm.

[0045] As shown in FIG. 7B, when an insulator 17 is sandwiched between a first conductor 7 and a second conductor 8, a dielectric breakdown occurs when the voltage between the first conductor 7 and the second conductor 8 exceeds the dielectric breakdown strength of the insulator 17, for example, 40 KV / mm. In the case of FIG. 7B, the first conductor 7, the second conductor 8, and the insulator 17 are placed in the air 16. Since the dielectric strength of the air 16 is lower than that of the insulator 17, a current due to a dielectric breakdown flows along the surface of the insulator 17 on the air 16 side. Therefore, the input energy is consumed on the air 16 side and does not contribute to the breakdown of the insulator 17.

[0046] Part (C) of Fig. 7 shows a state in which the first conductor 7 and the second conductor 8 sandwiching the insulator 17 as in part (B) are immersed in water 18. In the state shown in part (C) of Fig. 7, the water 18 has a higher dielectric strength than the air 16, and therefore most of the shock waves and the like caused by the energy consumed on the air 16 side in the state shown in part (B) of Fig. 7 act on the insulator 17 side, destroying the insulator 17.

[0047] On the other hand, when a convex portion 10 is provided on the first conductor 7 as in the embodiment of the present invention shown in part (D) of Fig. 7, as described above, dielectric breakdown is likely to occur between the tip of the convex portion 10 and the second conductor 8. In addition, the energy is not consumed on the air 16 side, and almost all of it contributes to the breakdown of the insulator 17. That is, in the state shown in part (D) of Fig. 7, even if it is placed in the air 16, shock waves due to dielectric breakdown effectively destroy the insulator 17.

[0048] FIG. 8 is a process diagram showing a composite material disassembly method according to an embodiment of the present invention. In FIG. 8, the description will be given with reference to FIG. 1 to FIG. 3 as appropriate. This composite material disassembly method includes a composite material formation step S81 and a separation step S82. The composite material formation step S81 described above includes an insulating member application step S811 and a matching step S812. In the insulating member application step S811, an insulating member 9 that functions as an adhesive is applied to the surface of the first conductor 7 having the convex portion 10 on the convex portion 10 side. Next, in the matching step S812, the first conductor 7 and the second conductor 8 positioned on the convex portion 10 side are joined or bonded by the insulating member 9 to form the composite material 1. The convex portion 10 in the first conductor 7 may be formed, for example, by piling up a welded piece of the conductor using a welding machine as described above. Alternatively, the convex portion 10 may be provided during press molding.

[0049] The above-mentioned separation step S82 includes an electrode abutment step S821 and an electric pulse application step S822. In the electrode abutment step S821, the positive electrode 12 is abutted against the first conductor 7, and the negative electrode 14 is abutted against the second conductor 8. Next, in the electric pulse application step S822, an electric pulse, which is a high voltage pulse, is applied between the positive electrode 12 and the negative electrode 14 from the high voltage pulse generator 3 through the positive cable 11 and the negative cable 13. When the electric pulse is applied in this way, a shock wave or the like due to insulation breakdown is generated between the protruding end of the convex portion 10 and the second conductor 8. Therefore, the shock wave or the like effectively destroys the insulating member. In this way, the insulating member 9 functioning as an adhesive is destroyed, and as a result, the first conductor 7 and the second conductor 8 constituting the composite material 1 are separated.

[0050] According to the electric pulse decomposition method, composite material, and composite material decomposition method of the present embodiment, the following effects are achieved.

[0051] In the electric pulse decomposition method (1), dielectric breakdown is likely to occur between the convex portion 10 formed in the convex portion forming step S1 and the second conductor 8 adjacent to and facing the convex portion 10. The shock waves generated by the dielectric breakdown current effectively destroy the insulating material. As a result of the destruction of the insulating material 9 functioning as an adhesive, the first conductor 7 and the second conductor 8 constituting the composite material 1 are separated. Even if the composite material 1 is placed in air, most of the energy does not escape into the air and contributes to the destruction of the insulating material 9. Therefore, it is not necessary to suppress creeping discharge when the composite material 1 is placed in water, and the method can be easily carried out. Note that the method does not exclude the method from being carried out in water.

[0052] In the composite material (2), dielectric breakdown is likely to occur between the tip of the convex portion 10 and the second conductor adjacent to and facing the tip, and the shock waves generated by the breakdown current can effectively destroy the insulating member 9, which functions as an adhesive, and separate the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0053] In the composite disassembly method of (3), in the composite formation step S81, the insulating member 9 functioning as an adhesive is applied to the first conductor 7 having the convex portion 10 in advance, and the first conductor 7 and the second conductor 8 located on the protruding end side of the convex portion 10 are joined or bonded to form the composite 1. Therefore, when an electric pulse is applied to the first conductor 7 and the second conductor 8 in the separation step S82, insulation breakdown is likely to occur between the convex portion 10 of the first conductor 7 and the second conductor 8 adjacent to and facing the convex portion 10. This shock wave or the like generated by the current of the insulation breakdown effectively destroys the insulating member. In this way, as a result of the destruction of the insulating member 9 functioning as an adhesive, the first conductor 7 and the second conductor 8 constituting the composite 1 are separated.

[0054] In the electric pulse decomposition method (4), the height of the convex portion 10 is appropriate, so that dielectric breakdown occurs easily when an electric pulse is applied. The shock waves generated by the dielectric breakdown current can effectively destroy the insulating member 9, separating the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0055] In the composite material (5), the height of the convex portion 10 is appropriate, so that dielectric breakdown is likely to occur when an electric pulse is applied. The shock waves generated by the dielectric breakdown current can effectively destroy the insulating member 9, separating the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0056] In the composite material disassembly method (6), the height of the convex portion 10 is appropriate, making it easier for dielectric breakdown to occur when an electric pulse is applied, and the insulating member 9 can be effectively destroyed by shock waves generated by the dielectric breakdown current, thereby separating the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0057] In the electric pulse decomposition method (7), the dielectric strength between the convex portion 10 and the second conductor 8 adjacent to and facing the convex portion 10 becomes even smaller, and the insulating member 9 can be effectively destroyed by shock waves generated by the breakdown current, thereby separating the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0058] In the composite material (8), the dielectric strength between the convex portion 10 and the second conductor 8 adjacent to and facing the convex portion 10 becomes even smaller, and the insulating member 9 can be effectively destroyed by shock waves generated by the breakdown current, thereby separating the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0059] In the composite material disassembly method (9), the dielectric strength between the convex portion 10 and the second conductor 8 adjacent to and facing the convex portion 10 becomes even smaller, and the insulating member 9 can be effectively destroyed by shock waves generated by the breakdown current, etc., to separate the first conductor 7 and the second conductor 8 that constitute the composite material 1.

[0060] Although the embodiment of the present invention has been described above, the present invention is not limited thereto. Appropriate modifications may be made within the scope of the present invention. For example, depending on the shape of the composite material, the electric pulse decomposition method may be applied without fixing the composite material with a gripping device or the like when applying the electric pulse. [Explanation of symbols]

[0061] 1…Composite material 2...Gripping device 3…High voltage pulse generator 4. Bass 5...Fixed gripping member 6...Movable gripping member 7…First conductor 8...Second conductor 9...Insulating material 10…Convex part 11…Positive cable 12...Positive electrode 13…Negative cable 14...Negative electrode 15...electrodeposition coating film 16. Air 17...Insulator 18…Wednesday

Claims

1. An electric pulse decomposition method for separating a composite material in which a plurality of conductors are joined or bonded by an insulating member by using an electric pulse, comprising the steps of: a convex portion forming step of forming a convex portion at a specific portion of at least one of the plurality of conductors on a side where the insulating member is disposed; a separation step of bringing electrodes into contact with a surface of each of the plurality of conductors and applying an electric pulse between the electrodes to destroy the insulating material and separate the plurality of conductors in the composite material.

2. A composite material in which a first conductor and a second conductor are joined or bonded by an insulating member and separated by an electric pulse, a protrusion formed on at least one of the first conductor and the second conductor so as to protrude toward the other; a composite material having an insulating member that is applied to an area including the portion where the convex portion is formed and that joins or bonds the first conductor and the second conductor.

3. a composite material forming process in which an insulating material is applied to a first conductor having a predetermined convex portion, and the first conductor and a second conductor located on the protruding end side of the convex portion are joined or bonded to each other by the insulating material to form a composite material; a separation step of applying an electric pulse between the first conductor and the second conductor to destroy the insulating member and separate the first conductor and the second conductor.

4. 2. The electric pulse decomposition method according to claim 1, wherein the height of the protrusion is equal to or greater than three-quarters of the thickness of the insulating member.

5. 3. The composite material according to claim 2, wherein the height of the protrusion is equal to or greater than three-quarters of the thickness of the insulating member.

6. 4. The method for disassembling a composite material according to claim 3, wherein the height of the protrusion is equal to or greater than three-quarters of the thickness of the insulating member.

7. An electric pulse decomposition method as described in claim 4, wherein an insulating film is formed on the other conductor of the plurality of conductors, and the convex portion is in contact with the film.

8. A composite material as described in claim 5, wherein an insulating film is formed on the other conductor of the plurality of conductors, and the convex portion is in contact with the film.

9. A method for decomposing a composite material as described in claim 6, wherein an insulating film is formed on the other conductor of the plurality of conductors, and the convex portion contacts the film.

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